A milling machine for milling the end face of a wind turbine blade

Abstract

The utility model discloses a milling machine for milling the end face of wind power blade, including center disc, be provided with carousel in the center disc rotation, along the diameter direction of carousel fixed link has rotary arm, be equipped with milling assembly and laser range finder on rotary arm, be provided with a plurality of main support leg on the center disc, and one end of main support leg is equipped with first support plate and is fixedly connected with bolt sleeve in the other end, and bolt sleeve rotation connects on first screw rod, and first screw rod is connected with first drive portion, the opposite sides of main support leg still are equipped with first sliding rail, and first sliding rail sets up along the length direction of main support leg, and the outside wall on the center disc is equipped with the bushing corresponding with main support leg, and the slider that cooperates with sliding rail is equipped in the bushing, when first drive portion drives the telescopic movement of main support leg, first sliding rail slides in the slider. The telescopic structure of this milling machine main support leg is not easy to deform, and the telescopic stroke is controlled accurately, thereby can stably support on the inner surface of wind power blade.

Description

Technical Field

[0001] This utility model relates to the technical field of end face milling of wind turbine blades, specifically to a milling machine for milling the end face of wind turbine blades. Background Technology

[0002] The blades and hub of a wind turbine are typically connected as a single unit via threads. During blade manufacturing, high-strength bolt sleeves are pre-embedded at the blade root. The end face of the bolt sleeve, along with a gasket, is then assembled with the hub flange, and high-strength bolts are used to lock the two flange faces together. However, the blades need to withstand wind sweeping from different directions, resulting in very high stress. If the connection surface between the blade and the hub is uneven, it can cause blade wobbling or even damage to the entire wind turbine. Therefore, the connection strength between the blade and the hub requires very high precision, necessitating the precision machining of the pre-embedded bolt sleeve end face on the flange.

[0003] Existing equipment for processing the end faces of wind turbine blades typically uses a support assembly to fix the blade to the inner side of the blade tip. A rotating assembly drives a milling cutter to rotate around the root end face of the blade, completing the milling operation. However, with the development of the wind power industry, the diameter of wind turbine blade tips is increasing. Currently, the diameter of the mating surface between the root of the wind turbine blade and the hub ranges from 2.8m to 4.6m, and even the diameter of the root of high-power wind turbine blades can reach 4.8m. Therefore, the support legs of wind turbine blade end face processing equipment are mostly telescopic structures. For example, utility model patent CN219403204U discloses a wind turbine blade end face milling machine, whose support legs are driven by a servo electric cylinder to extend and retract a telescopic rod to accommodate wind turbine blades of different diameters. However, during use, it was found that when the telescopic rod extends too far, there is a large sway space between the telescopic rod and the servo electric cylinder or the side wall of the main support leg, causing the telescopic rod to bend and deform during support, affecting the stability of the support for the wind turbine blade and resulting in inaccurate processing accuracy. Utility Model Content

[0004] The purpose of this invention is to provide a milling machine for milling the end face of wind turbine blades. The telescopic structure of the main support leg of this milling machine is not easily deformed, and it is easy to accurately control the telescopic stroke, so as to stably support the inner surface of the wind turbine blade.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A milling machine for milling the end face of a wind turbine blade includes a center disk, a turntable rotatably mounted on the front end face of the center disk, a rotating arm fixedly connected along the diameter of the turntable, a milling assembly and a laser rangefinder mounted on the rotating arm, and several main support legs telescopically mounted on the back of the center disk. Each main support leg has a first support plate on one side near the inner surface of the wind turbine blade and a bolt sleeve fixedly connected to the other end. The bolt sleeve is rotatably connected to a first lead screw, which is connected to a first drive unit. First slide rails are also provided on opposite sides of each main support leg, extending along the length of the main support leg. A sleeve corresponding to each main support leg is provided on the outer wall of the center disk, and a slider cooperating with the slide rail is located within the sleeve. When the first drive unit drives the main support leg to telescopically move, the first slide rail slides within the slider.

[0007] Preferably, it also includes an auxiliary support leg, the upper surface of which is provided with a second support plate, the lower surface of which is connected to the telescopic rod of the first cylinder, and a directional shaft is provided around the lower surface of the second support plate, the directional shaft being slidably mounted on the auxiliary support leg.

[0008] Preferably, a sliding assembly is provided on the side of the main support leg near the inner surface of the wind turbine blade. The sliding assembly includes a first slide block, a second lead screw, and a second slide rail. The second slide rail and the second lead screw are connected to the end of the main support leg and are perpendicular to the first slide rail. One end of the second lead screw is fixedly connected to the second drive unit and can rotate under the drive of the second drive unit. The first slide block is screwed onto the second lead screw and can slide on the second slide rail under the drive of the second lead screw. The first support plate is arc-shaped and fixedly connected to the first slide block.

[0009] Preferably, a fifth driving unit is provided on the central disk for driving the turntable to rotate; an outer ring is fixedly connected to the positive end face of the central disk, and an inner ring that cooperates with the outer ring is fixedly connected to the turntable, and the inner ring is rotatably disposed within the outer ring; the inner ring is provided with a retaining tooth in the inner circumferential direction, and the output end of the fifth driving unit is provided with a driving gear that meshes with the retaining tooth.

[0010] Preferably, a feed assembly is provided between the rotating arm and the milling assembly. The feed assembly includes a second slide, a third lead screw, and a third slide rail. The third slide rail and the third lead screw are connected to both ends of the rotating arm and are perpendicular to the rotating arm. One end of the third lead screw is fixedly connected to a third drive unit and can rotate under the drive of the third drive unit. The second slide is screwed onto the third lead screw and slides on the third slide rail under the drive of the third lead screw. The milling assembly is fixedly connected to the second slide. The milling assembly includes a milling motor, which is connected to the second slide and a milling cutter is fixedly connected to the milling motor.

[0011] Preferably, the two ends of the rotating arm are also fixedly connected to a base, and a fourth slide rail and a fourth lead screw are provided on the base. The fourth slide rail and the fourth lead screw are arranged parallel to the rotating arm, and one end of the fourth lead screw is fixedly connected to the fourth drive unit and can rotate under the drive of the fourth drive unit; the third lead screw and the third slide rail are fixedly connected to the third slide block, and the third slide block is slidably arranged on the fourth lead screw and slides on the fourth slide rail under the drive of the fourth lead screw.

[0012] Preferably, the turntable is provided with a fall protection component, which includes a fifth slide rail vertically arranged on the back of the central plate, a fourth slide block on the fifth slide rail, a clamping member at the upper end of the fourth slide block, the fourth slide block being connected to a second cylinder, and the clamping member being driven upward by the second cylinder to contact the inner surface of the wind turbine blade.

[0013] Preferably, it also includes a hoisting assembly, which includes a connecting part for fixing the turntable. A second mounting plate is provided on the top of the connecting part. A first hook and an electric push rod are provided on the second mounting plate. When an external steel wire passes through the first hook, the electric push rod moves to the side of the first hook and locks the external steel wire in the first hook.

[0014] Preferably, it also includes several positioning baffles, which are radially arranged on the turntable and protrude from the main support leg; a magnet is provided on the side of the positioning baffle near the end face of the wind turbine blade for adsorption onto the end face of the external wind turbine blade.

[0015] Preferably, a first bracket is provided at the lower end of the outer side wall of the central disk, and a second bracket is provided at the edge of the back side of the central disk.

[0016] In the above technical solution, several main support legs are telescopically arranged on the central plate. One end of the main support leg near the inner surface of the wind turbine blade is provided with a first support plate and a bolt sleeve is fixedly connected to the other end. The bolt sleeve is rotatably connected to a first lead screw. One end of the first lead screw extends into the interior of the main support leg and the other end is connected to a first drive unit. First slide rails are provided on opposite sides of the main support leg. The first slide rails are arranged along the length direction of the main support leg. A sleeve corresponding to the main support leg is provided on the central plate. A slider that cooperates with the slide rail is fixedly connected inside the sleeve. The main support leg passes through the sleeve and the first slide rail is slidably arranged on the slider. When the main support leg extends or retracts, the first drive unit drives the first lead screw to rotate, the bolt sleeve slides on the first lead screw, and the first slide rail slides within the slider as the main support leg extends or retracts. Through the cooperation of the first slide rail and the slider, and the mutual limiting of the bolt sleeve and the first lead screw, two-point limiting support is formed for the main support leg, strengthening the connection between the main support leg and the center plate. Even when the main support leg extends to a large length, bending deformation will not occur, thus facilitating more precise control of the extension and retraction stroke of the main support leg and making the support of the wind turbine blade more stable. Therefore, the main support leg of this milling machine can extend or retract to a large length, making it suitable for processing the end faces of wind turbine blades of various sizes. Simultaneously, the slider restricts the main support leg to only move forward or backward along the length direction of the first lead screw, thereby allowing the main support arm to extend and retract in the radial direction. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a three-dimensional structural diagram of the back (with cover) of this utility model;

[0019] Figure 3 This is a three-dimensional structural diagram of the back (without cover) of this utility model;

[0020] Figure 4 This is a bottom view of the rear of the present invention (without cover plate and fall protection components);

[0021] Figure 5 This is a three-dimensional structural diagram of the main support leg and sliding assembly of this utility model;

[0022] Figure 6 This is a three-dimensional structural diagram of the sliding component of this utility model at the second angle;

[0023] Figure 7 This is a three-dimensional structural diagram of the feeding component of this utility model;

[0024] Figure 8 This is a three-dimensional structural diagram of the hoisting component of this utility model.

[0025] In the diagram, 1 is the central disk; 11 is the turntable; 111 is the outer ring; 112 is the inner ring; 113 is the clasp; 12 is the outer side wall; 13 is the sleeve; 14 is the slider; 15 is the fifth drive unit; 17 is the first bracket; 18 is the second bracket; 2 is the feed assembly; 21 is the second slide; 22 is the third lead screw; 23 is the third slide rail; 24 is the third drive unit; 3 is the milling assembly; 31 is the milling motor; 32 is the milling cutter; 4 is the rotating arm; 41 is the third slide; 42 is the fourth slide rail; 43 is the fourth lead screw; 45 is the base; 5 is the main support leg; 51 is the first support plate; 52 is the bolt sleeve; 53 First lead screw; 54 First drive unit; 55 First slide rail; 56 First mounting plate; 6 Sliding assembly; 61 First slide block; 62 Second lead screw; 63 Second slide rail; 64 Second drive unit; 7 Auxiliary support leg; 71 Second support plate; 72 First cylinder; 73 Directional shaft; 8 Anti-fall assembly; 82 Fourth slide block; 83 Tightening component; 84 Second cylinder; 9 Lifting assembly; 91 Connecting part; 92 Second mounting plate; 93 First hook; 95 Third electromagnetic induction switch; 10 Positioning baffle; 101 Magnet component. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings:

[0027] like Figures 1 to 8 As shown, a milling machine for milling the end face of a wind turbine blade includes a center disk 1, a turntable 11 rotatably mounted on the positive end face of the center disk 1, a rotating arm 4 fixedly connected along the diameter direction of the turntable 11, a milling assembly 3 and a laser rangefinder mounted on the rotating arm 4, the turntable 3 driving the rotating arm 4 to rotate, the laser rangefinder measuring the distance between the milling assembly 3 and the end face of the wind turbine blade, and the milling assembly 3 grinding and milling the end face of the wind turbine blade.

[0028] Several main support legs 5 are telescopically arranged on the back of the central disk 1, preferably three main support legs 5, which are evenly spaced circumferentially on the back of the central disk 1. A first support plate 51 is provided on the side of each main support leg 5 closest to the inner surface of the wind turbine blade, and a bolt sleeve 52 is fixedly connected to the other end. The bolt sleeve 52 is rotatably connected to a first lead screw 53, one end of which extends into the main support leg 5, and the other end is connected to a first drive unit 54. First slide rails 55 are also provided on opposite sides of each main support leg 5, arranged along the length of the main support leg 5. A sleeve 13 corresponding to the main support leg is provided on the outer wall 12 of the central disk, and a slider 14 cooperating with the slide rail 55 is fixedly connected inside the sleeve 13. The main support leg 5 passes through the sleeve 13, and the first slide rail 55 is slidably mounted on the slider 14. When the first drive unit 54 drives the main support leg 5 to telescopically move, the first slide rail 55 slides within the slider 14. When the main support leg extends or retracts, the first drive unit 54 drives the first lead screw 53 to rotate, the bolt sleeve 52 slides forward on the first lead screw 53, and the first slide rail 55 slides within the slider 14, that is, the main support leg 5 extends outward so that the first support plate 51 is supported on the inner wall of the wind turbine blade. In this way, the sliding direction of the main support leg 5 is limited by the cooperation of the first slide rail 55 and the slider 14, and the mutual limiting of the bolt sleeve 52 and the first lead screw 53, forming two-point limiting for the main support leg 5. Even if the main support leg 5 extends to a large length, there will be no bending deformation problem. At the same time, the main support leg 5 is limited to moving forward or backward only in the driving direction of the first drive unit 54. This makes it easier to control the stroke of the main support leg 5 more precisely and support it more stably on the inner wall of the wind turbine blade. Furthermore, the main support leg 5 is a hollow square tube, which increases the supporting strength of the main support leg 5 and further prevents it from bending deformation. The first lead screw 53 is a T-type lead screw, and the first drive unit 54 is a servo motor and a worm gear reducer. The output end of the servo motor is a worm gear reducer, and the worm gear reducer is connected to the T-type lead screw.

[0029] It also includes auxiliary support legs 7, of which two sets are spaced apart above the swing arm 14. A second support plate 71 is vertically mounted on the upper surface of the auxiliary support leg 7. The telescopic rod of a first cylinder 72 is connected to the center of the lower surface of the second support plate 71. The first cylinder 72 controls the radial extension and retraction of the second support plate 71 to support the inner surface of the wind turbine blade. Furthermore, directional shafts 73 are provided around the lower surface of the second support plate 71. These directional shafts 73 are slidably mounted on the auxiliary support legs 7. The directional shafts 73 assist the first cylinder 72 in supporting the second support plate 71 more easily on the small surface of the wind turbine blade. Even if the second support plate 71 is not perfectly flat on the lower surface of the wind turbine blade, the connection between the telescopic rod of the first cylinder 72 and the second support plate 71 will not bend laterally, nor will the telescopic rod of the first cylinder 72 be bent or deformed. By simultaneously supporting the wind turbine blade with the main support leg 5 and the auxiliary support leg 7, the contact with the inside of the wind turbine blade is increased, while the stability of the support is improved.

[0030] In a preferred embodiment, the first support plate 51 and the second support plate 71 are arc-shaped so that they can fit more closely to the surface of the wind turbine blade. Furthermore, both the first support plate 51 and the second support plate 71 are provided with anti-slip pads 65. When the milling machine moves into the inside of the wind turbine blade and supports the wind turbine blade, the anti-slip pads 65 press against the inner surface of the wind turbine blade to further fix and support the position of the milling machine.

[0031] In a preferred embodiment, a sliding assembly 6 is provided on the side of the main support leg 5 near the inner surface of the wind turbine blade. The sliding assembly 6 is used to push the milling machine to translate or fine-tune relative to the wind turbine blade, so as to facilitate the milling assembly being parallel to the end face of the wind turbine blade. Specifically, the sliding assembly 6 includes a first slide block 61, a second lead screw 62, and a second slide rail 63. The second slide rail 63 and the second lead screw 62 are fixedly connected to the first mounting plate 56 at the end of the main support leg 5 and are perpendicular to the first slide rail 55. One end of the second lead screw 62 is fixedly connected to the second drive unit 64 and can rotate under the drive of the second drive unit 64. The first slide block 61 is screwed onto the second lead screw 62 and slides on the second slide rail 63 under the drive of the second lead screw 62. The first support plate 51 is fixedly connected to the first slide block 61. When the milling machine is fixed on the inner surface of the wind turbine blade, the main support leg 5 drives the first support plate 51 to move upward and support the inner surface of the wind turbine blade. If the milling plane of the milling machine is not parallel to the end face of the wind turbine blade, the second drive unit 64 drives the second lead screw 62 to rotate. Since the first support plate 51 does not slip when it abuts against the inner surface of the wind turbine blade, the first slide block 61 fixed on the first support plate 51 remains stationary. In this way, the second lead screw 62 moves relative to the first slide block 61 and drives the second slide rail 63 to slide relative to the first slide block 61, that is, pushes the milling machine to move outward. According to the inclination angle of the milling plane of the milling machine relative to the end face of the wind turbine blade, different second drive units 64 control the corresponding second lead screw 62 to extend or retract by different lengths, thereby realizing the automatic leveling of the milling machine without the need for manual leveling during placement.

[0032] A fifth drive unit 15 is provided on the central disk 1 to drive the turntable 11 to rotate. An outer ring 111 is fixedly connected to the positive end face of the central disk 1, and an inner ring 112 that cooperates with the outer ring 111 is fixedly connected to the turntable 11, and the inner ring 112 is rotatably disposed inside the outer ring 111; a retaining tooth 113 is provided along the inner circumferential direction of the inner ring 112, and a drive gear that meshes with the retaining tooth 113 is provided at the output end of the fifth drive unit 15. The fifth drive unit 15 drives the drive gear to rotate, and the rotation of the turntable 11 is achieved through the retaining tooth 113.

[0033] A feed assembly 2 is provided between the rotating arm 4 and the milling assembly 3. The feed assembly 2 is used to control the milling thickness of the milling assembly 3. The feed assembly 2 includes a second slide 21, a third lead screw 22, and a third slide rail 23. The third slide rail 23 and the third lead screw 22 are connected to both sides of the rotating arm 4 and are perpendicular to the rotating arm 4. One end of the third lead screw 22 is fixedly connected to the third drive unit 24 and can rotate under the drive of the third drive unit 24. The second slide 21 is screwed onto the third lead screw 22 and slides on the third slide rail 23 under the drive of the third lead screw 22. The milling assembly 3 is fixedly connected to the second slide 21. The third drive unit 24 drives the second slide 21 to reciprocate along the third slide rail 23 through the third lead screw 22, that is, it drives the milling assembly 3 to move closer to or away from the end face of the wind turbine blade. When the milling thickness is large, it drives the milling assembly 3 to move closer to the end face of the wind turbine blade. When the milling thickness is small, it drives the milling assembly 3 to move away from the end face of the wind turbine blade. Furthermore, two first electromagnetic induction switches are provided, which are located at the original position and the feed position of the feed assembly 2, respectively.

[0034] The milling assembly 3 includes a milling motor 31, which is fixedly connected to the second slide 21. The output end of the milling motor 31 is fixedly connected to the milling cutter 32 and drives the milling cutter 32 to rotate for milling operations. Furthermore, a protective cover (not shown in the figure) is provided at the end of the milling cutter 32. A vacuum cleaner is connected to the protective cover via a suction pipe to collect the milled dust, maintaining a clean and hygienic working environment.

[0035] Bases 45 are fixedly connected to both sides of the rotating arm 4. A fourth slide rail 42 and a fourth lead screw 43 are mounted on the bases 45. The fourth slide rail 42 and the fourth lead screw 43 are parallel to the rotating arm 4, and one end of the fourth lead screw 43 is fixedly connected to a fourth drive unit (not shown in the attached diagram) and can rotate under the drive of the fourth drive unit. A third lead screw 22 and a third slide rail 23 are fixedly connected to a third slide block 41. The third slide block 41 is slidably mounted on the fourth lead screw 43 and slides on the fourth slide rail 42 under the drive of the fourth lead screw 43. The fourth drive unit (not shown in the attached diagram) drives the third slide block 41 to translate along the length direction of the rotating arm 4 via the fourth lead screw 43, thereby adjusting the milling radius of the milling assembly 3 and further improving the applicability of the milling machine.

[0036] In a preferred embodiment, a fall protection component 8 is provided on the turntable 11. The fall protection component 8 includes a fifth slide rail (not shown in the figure) vertically arranged on the back of the central plate 1. A fourth slide block 82 is slidably arranged on the fifth slide rail. A clamping member 83 is provided at the upper end of the fourth slide block 82. The fourth slide block 82 is connected to a second cylinder 84, and the clamping member 83 is driven upward by the second cylinder 84 to contact the inner surface of the wind turbine blade. The second cylinder 84 controls the pressure relief operation through an induction valve and is independent of the electrical control unit of the milling machine. When the milling machine leveling operation is completed, the second cylinder 84 is controlled by the PLC to push the fourth slide block 82 upward, so that the clamping member 83 is supported at the inner surface of the wind turbine blade. In the event of an operational error or power failure, causing the main support leg or auxiliary support leg on the upper side of the boom to fail, the second cylinder 84 will not be affected. The clamping member 83 and the main support leg on the lower side of the boom will contact and support the inner surface of the wind turbine blade, effectively preventing the wind turbine blade from falling and causing danger.

[0037] In one embodiment, a hoisting assembly 9 is also included. The hoisting assembly 9 includes a connecting portion 91 fixedly connected to the turntable 1. A second mounting plate 92 is provided on the top of the connecting portion 91. A first hook 93 and an electric push rod (not shown) are provided on the second mounting plate 92. When an external steel wire passes through the first hook 93, the electric push rod (not shown) moves towards the first hook 93 and locks the external steel wire in the first hook 93. By providing an electric push rod on the hoisting assembly 9, when the electric push rod extends, it forms a closed loop with the first hook 93, preventing the steel wire rope from coming off. Furthermore, a third electromagnetic induction switch 95 is provided in the first hook 93. After receiving a signal that the steel wire rope is hooked on the first hook 93, the third electromagnetic induction switch 95 feeds back to the PLC controller. The PLC controls the electric push rod to move closer to the first hook 93 and lock the steel wire rope inside the first hook 93, thus connecting it to the first hook 93.

[0038] It also includes several positioning baffles 10, preferably three sets evenly spaced circumferentially. The positioning baffles 10 are radially arranged on the turntable 11 and protrude from the main support leg 5. When the milling machine is fixed on the inner surface of the wind turbine blade, the positioning baffles 10 contact the end face of the wind turbine blade, preventing the milling machine from extending too far into the interior of the wind turbine blade, while avoiding hard impact between the milling assembly 3 and the end face of the wind turbine blade, which could damage the milling cutter or scratch the blade surface. At the same time, the positioning baffles 10 can also help the milling machine to level and be parallel to the wind turbine blade. Furthermore, a magnet 101 is provided on the side of the positioning baffle 10 near the end face of the wind turbine blade for adsorption onto the external end face of the wind turbine blade. The three sets of magnetic supports 41 provide precise positioning when the milling machine is connected to the end face of the wind turbine blade. When the three sets of magnets 42 are completely attached to the end face of the wind turbine blade, the rotating arm 14 is flush with the end face of the wind turbine blade.

[0039] In one embodiment, a first support 17 is provided at the lower end of the outer wall 12 of the central disk, and a second support 18 is provided on the edge of the back of the central disk 1. The first support 17 is used to support the milling machine on the ground when it is placed vertically, and the second support 18 is used to support the milling machine on the ground when it is placed horizontally, so as not to damage the structure of the milling machine.

[0040] In one embodiment, the second, third, fourth, and fifth drive units each include a servo motor and a reducer, and a protective cover is provided on the outside of each drive unit. The third, fourth, and fifth lead screws are preferably ball screws.

[0041] In one embodiment, a conductive slip ring is provided in the center of the rotating arm 4. The cable of the electrical control device passes through the conductive slip ring to transmit power and signals to the milling machine, ensuring the normal operation of the milling machine and making the machine run more smoothly and efficiently. This enables the rotating arm to rotate continuously and perform comprehensive and continuous milling on the blade end face.

[0042] When using the above technical solution, a hoisting vehicle is used to hoist the milling machine to the root of the blade, and the main support leg 5 is inserted into the interior of the wind turbine blade. At this time, the positioning baffle 10 contacts the end face of the wind turbine blade. Then, the first drive unit drives the main support leg 5 to extend outward along the first slide rail 55 through the first lead screw until the first support plate 51 supports the inner surface of the wind turbine blade, and the auxiliary support leg 7 extends out, so that the second support plate 71 supports the inner surface of the wind turbine blade. Thus, the wind turbine blade and the milling machine are in a connected state, and the initial support positioning of the milling machine is completed.

[0043] Alternatively, the two main support legs 5 on the lower side of the boom can first extend to support the inside of the wind turbine blade, and then the main support legs 5 and auxiliary support legs 7 on the upper side of the boom can extend respectively, so that the first support plate 51 and the second support plate 71 support the inner surface of the wind turbine blade.

[0044] Then, by rotating the laser rangefinder, the distance between the milling plane of the milling machine and the wind turbine blade is measured. The milling machine is then adjusted or fine-tuned using the sliding assembly 6 until it is parallel to the wind turbine blade. After leveling, the two main support legs 5 on the lower side of the rotating arm are locked to prevent them from failing after a power outage. Finally, the second cylinder 84 pushes the clamping member 83 to fix it to the inner surface of the wind turbine blade, and the auxiliary support leg 7 supports the inner surface of the wind turbine blade. Afterwards, the rotating arm 4 rotates under the drive of the turntable 11. The milling cutter 32, under the action of the third lead screw, precisely controls the feed amount to mill the end face of the wind turbine blade, ensuring milling consistency. The milling cutter 32 quickly mills uneven areas, making its flatness smoother and more even. The processing is fast and convenient.

[0045] The embodiments are merely illustrative of the concept and implementation of this utility model and are not intended to limit it. Under the concept of this utility model, the technical solutions without substantial changes are still within the scope of protection.

Claims

1. A milling machine for milling the end face of wind turbine blades, comprising a center disk, a turntable rotatably mounted on the positive end face of the center disk, a rotating arm fixedly connected along the diameter direction of the turntable, and a milling assembly and a laser rangefinder mounted on the rotating arm, characterized in that, Several main support legs are telescopically arranged on the back of the central disk. A first support plate is provided on the side of the main support leg near the inner surface of the wind turbine blade, and a bolt sleeve is fixedly connected to the other end. The bolt sleeve is rotatably connected to a first lead screw, and the first lead screw is connected to a first drive unit. First slide rails are also provided on opposite sides of the main support legs. The first slide rails are arranged along the length direction of the main support legs. A sleeve corresponding to the main support leg is provided on the outer wall of the central disk. A slider that cooperates with the slide rail is provided inside the sleeve. When the first drive unit drives the main support leg to telescopically move, the first slide rail slides in the slider.

2. The milling machine for milling the end face of wind turbine blades as described in claim 1, characterized in that, It also includes an auxiliary outrigger, on the upper surface of which a second support plate is raised and lowered. The lower surface of the second support plate is connected to the telescopic rod of the first cylinder. A directional shaft is also provided around the lower surface of the second support plate, and the directional shaft is slidably mounted on the auxiliary outrigger.

3. The milling machine for milling the end face of wind turbine blades as described in claim 2, characterized in that, A sliding assembly is provided on the side of the main support leg near the inner surface of the wind turbine blade. The sliding assembly includes a first slide block, a second lead screw, and a second slide rail. The second slide rail and the second lead screw are connected to the end of the main support leg and are perpendicular to the first slide rail. One end of the second lead screw is fixedly connected to a second drive unit and can rotate under the drive of the second drive unit. The first slide block is screwed onto the second lead screw and can slide on the second slide rail under the drive of the second lead screw. The first support plate is arc-shaped and fixedly connected to the first slide block.

4. The milling machine for milling the end face of wind turbine blades as described in claim 3, characterized in that, A fifth driving unit is provided on the central disk for driving the turntable to rotate; an outer ring is fixedly connected to the positive end face of the central disk, and an inner ring that cooperates with the outer ring is fixedly connected to the turntable, and the inner ring is rotatably disposed inside the outer ring; the inner side of the inner ring is provided with a retaining tooth in the circumferential direction, and the output end of the fifth driving unit is provided with a driving gear that meshes with the retaining tooth.

5. The milling machine for milling the end face of wind turbine blades as described in any one of claims 1 to 4, characterized in that, A feed assembly is provided between the rotating arm and the milling assembly. The feed assembly includes a second slide, a third lead screw, and a third slide rail. The third slide rail and the third lead screw are connected to both ends of the rotating arm and are perpendicular to the rotating arm. One end of the third lead screw is fixedly connected to a third drive unit and can rotate under the drive of the third drive unit. The second slide is screwed onto the third lead screw and slides on the third slide rail under the drive of the third lead screw. The milling assembly is fixedly connected to the second slide. The milling assembly includes a milling motor, which is connected to the second slide and a milling cutter is fixedly connected to the milling motor.

6. The milling machine for milling the end face of wind turbine blades as described in claim 5, characterized in that, The rotating arm is also fixedly connected to bases at both ends. A fourth slide rail and a fourth lead screw are provided on the bases. The fourth slide rail and the fourth lead screw are arranged parallel to the rotating arm. One end of the fourth lead screw is fixedly connected to the fourth drive unit and can rotate under the drive of the fourth drive unit. The third lead screw and the third slide rail are fixedly connected to the third slide block. The third slide block is slidably arranged on the fourth lead screw and slides on the fourth slide rail under the drive of the fourth lead screw.

7. The milling machine for milling the end face of wind turbine blades as described in claim 6, characterized in that, A fall protection assembly is provided on the turntable. The fall protection assembly includes a fifth slide rail vertically arranged on the back of the central plate, a fourth slide block on the fifth slide rail, a clamping member at the upper end of the fourth slide block, the fourth slide block being connected to a second cylinder, and the clamping member being driven upward by the second cylinder to contact the inner surface of the wind turbine blade.

8. The milling machine for milling the end face of wind turbine blades as described in claim 1 or 7, characterized in that, It also includes a hoisting assembly, which includes a connecting part for fixing a turntable. A second mounting plate is provided on the top of the connecting part. A first hook and an electric push rod are provided on the second mounting plate. When an external steel wire passes through the first hook, the electric push rod moves to the side of the first hook and locks the external steel wire in the first hook.

9. The milling machine for milling the end face of wind turbine blades as described in claim 8, characterized in that, It also includes several positioning baffles, which are radially arranged on the turntable and protrude from the main support leg; a magnet is provided on the side of the positioning baffle near the end face of the wind turbine blade for adsorption onto the end face of the external wind turbine blade.

10. The milling machine for milling the end face of wind turbine blades as described in claim 1, characterized in that, A first bracket is provided at the lower end of the outer wall of the central disk, and a second bracket is provided at the edge of the back of the central disk.

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