Clamping sleeve and blade bolt breaking device

Abstract

The invention relates to the field of wind turbine generators, and discloses a clamping sleeve and a blade bolt drawing-breaking device.The clamping sleeve comprises a sleeve body, the sleeve body is provided with a first end and a second end, the first end of the sleeve body is of a conical closing-up structure, and the inner wall of the conical closing-up part is a conical surface; a threaded groove is formed in the inner wall of the second end of the barrel; the clamping jaw is arranged in the conical closing-up part of the cylinder body, and the clamping jaw is matched with the conical inner wall of the cylinder body and slides along the conical inner wall of the cylinder body; after the broken rod is sleeved with the cylinder body, the clamping jaw automatically deflects and resets along the sliding groove, and the ratchet and the ratchet groove form one-way locking; the kidney-shaped rod stud can be taken out at a time without damage, operation is convenient and fast, clamping is reliable, and efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of wind turbine generators, and in particular to a clamping sleeve and blade bolt removal device. Background Technology

[0002] In wind turbines, the blades are the core components that convert wind energy into mechanical energy, and they are constantly exposed to extreme conditions such as alternating loads, gusts of wind, and sudden temperature changes. To reliably fix the blades to the hub bearings, some models use a "waist-shaped stud"—the diameter of the threaded sections at both ends is larger than the diameter of the smooth section in the middle, resembling a "waist." This structure provides sufficient tensile / shear strength while also creating a flexible transition between the blade root and the bearing, and is therefore considered a critical load-bearing component.

[0003] However, under long-term, high-frequency, high-amplitude cyclic loading, studs are most prone to fatigue cracks at the stress concentration point of the thread root. In addition, if the preload is uneven or there is misalignment between the shims and bearings during on-site installation, the cracks will propagate rapidly until the stud breaks. Once the stud breaks, the blades will loosen or even detach, inducing major accidents such as blade sweeping against the tower or the entire unit collapsing.

[0004] Due to the unique "large thread - small smooth rod" structure of the waisted rod stud, traditional pull-out tools can only operate on the threaded end face. If the fracture happens to occur in the smooth rod section, the fracture surface shrinks and there is no part available for clamping. In addition, the misalignment of the blade root washer and the bearing restricts the operating space, making it difficult for conventional tools to fix it radially. This makes it difficult to remove the fractured residual section, resulting in low maintenance efficiency and high safety risks. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is that once the waist-shaped stud fractures due to fatigue at the smooth rod, conventional tools cannot hold it due to its special structure and misalignment, making it difficult to safely and quickly remove the remaining segment.

[0006] The above-mentioned technical problems are solved by the following technical solution: This invention proposes a clamping sleeve, which includes,

[0007] The cylindrical body has a first end and a second end. The first end of the cylindrical body has a tapered opening structure, and the inner wall of the tapered opening is a tapered surface. The inner wall of the second end of the cylindrical body is provided with a threaded groove.

[0008] The chuck is located inside the conical constriction of the cylinder. The chuck engages with the conical inner wall of the cylinder and slides along the conical inner wall. When the waist-shaped stud breaks at a smooth point, it is fitted onto the broken part of the waist-shaped stud through the first end of the cylinder. During the fitting process, the waist-shaped stud pushes the internal chuck to slide along the conical inner wall of the cylinder until it reaches the diameter of the waist-shaped stud. At this point, under the action of gravity and with the conical constriction of the cylinder, the chuck slides down and fits against the outer wall of the waist-shaped stud. Pulling the cylinder upward will cause the chuck to continuously squeeze the waist-shaped stud, thereby effectively fixing the waist-shaped stud. Pulling the cylinder upward will then remove the waist-shaped stud.

[0009] In a preferred embodiment of the clamping sleeve of the present invention: a groove is provided on the outer wall of the tapered constriction structure of the cylinder, and the pawl slides along the groove on the tapered inner wall of the cylinder; under the guidance of the groove, it can be ensured that the pawl can move along a specified track, thus ensuring the stability of the pawl.

[0010] In a preferred embodiment of the clamping sleeve of the present invention: a slider is fixedly connected to one end of the claw, a limit block is fixedly connected to one end of the slider, the slider is located inside the slide groove, and the slider slides along the slide groove; by the slider sliding along the slide groove, the claw can be driven to move along the slide groove, and the limit block can prevent the claw from falling off the inner wall of the cylinder.

[0011] In a preferred embodiment of the clamping sleeve of the present invention: a ratchet groove is provided on the inner wall of the conical inner wall of the cylinder, and a ratchet tooth is fixedly connected to the outer side of the pawl, the ratchet tooth engaging with the ratchet groove; under the action of the ratchet tooth engaging with the ratchet groove, it can be ensured that when the pawl clamps and fixes the waist-shaped rod stud, it can only move in one direction, thereby avoiding the pawl moving in the opposite direction and causing loosening; at the same time, it can also increase the contact area between the pawl and the cylinder, further ensuring the stability of clamping.

[0012] In a preferred embodiment of the clamping sleeve of the present invention: the thickness of the jaws is gradually distributed along the direction of the slide groove, gradually increasing from the end closer to the slider to the end farther away from the slider; the gradually varying thickness of the jaws can ensure that the jaws can better fit with the waisted rod stud, improve its friction, and thus effectively clamp the waisted rod stud.

[0013] In a preferred embodiment of the clamping sleeve of the present invention: the limiting block is set at an angle on the side near the tapered opening of the cylinder; with the angled design, when the cylinder is sleeved from the top waist-shaped stud, the waist-shaped stud will abut against the bottom end of the claw and drive the claw to deflect towards the axis of the cylinder, causing the angled side of the limiting block to fit against the outer wall of the cylinder, thereby moving the ratchet out from the inside of the ratchet groove. Then, when the cylinder is sleeved downwards, the waist-shaped stud will drive the already deflected claw to move upwards until it reaches the diameter of the waist-shaped stud. At this time, under the action of gravity and in conjunction with the tapered opening of the cylinder, the claw will slide down and fit against the outer wall of the waist-shaped stud, thereby completing the clamping of the waist-shaped stud.

[0014] The present invention also provides a blade bolt removal device, including the aforementioned clamping sleeve, and further comprising,

[0015] A hollow jack, wherein the hollow jack is used to provide lifting force;

[0016] The screw is removed, and the screw is located inside the hollow jack, with one end of the screw near the cylinder being adapted and connected to the cylinder.

[0017] A base cylinder is located at the bottom end of the hollow jack and is used to increase the height of the hollow jack. The process involves placing the base cylinder on top of the hub assembly mounting plate, then installing the break-off screw inside the hollow jack, ensuring the break-off screw is connected to the cylinder, and finally placing the hollow jack on the base cylinder. Activating the hollow jack at this point will cause the break-off screw to move upwards, thereby pulling the cylinder until the waist-shaped stud is removed. The design of the base cylinder ensures that the hollow jack has sufficient working space, allowing for easy removal of the waist-shaped stud even if the pitch bearing and blade flange are misaligned, thanks to the power of the hollow jack.

[0018] In a preferred embodiment of the blade bolt removal device of the present invention: a nut is threadedly connected to the outer side of the removal screw, and a screw head is fixedly connected to one end of the removal screw near the cylinder; by placing the nut at the top of the hollow jack, the removal screw can be limited, ensuring that the hollow jack can lift the removal screw.

[0019] The nut is located at the top of the hollow jack, and the screw head is used to connect to the cylinder. The connection between the cut-off screw and the cylinder is completed by connecting the screw head to the threaded groove at the second end of the cylinder.

[0020] In a preferred embodiment of the blade bolt removal device of the present invention: an observation hole is provided on the outer side of the bottom cylinder; the observation hole is used to observe the real-time position during the operation.

[0021] The beneficial effects of this invention are as follows: When the waist-shaped rod stud breaks, the tapered end of the first end of the cylinder is fitted onto the broken rod from top to bottom. The rod end first pushes against the lower end of the chuck, causing the chuck to deflect in the direction of the cylinder axis with the slider and groove as fulcrum. This deflection causes the oblique angle of the limiting block to press against the outer wall of the cylinder, thereby forcibly pulling the ratchet out of the ratchet groove. Once the ratchet and ratchet groove are separated, the cylinder is then fitted downwards, which will drive the already deflected chuck to move upwards through the waist-shaped rod stud until it exceeds the waist. The maximum diameter of the waist-shaped stud; at this point, under the combined action of the tapered opening of the cylinder and the weight of the chuck, the chuck slides down the groove and contracts radially due to the gradual change in thickness. The re-engaged ratchet teeth and ratchet groove form a one-way lock, and the chuck firmly clamps the waist-shaped stud; finally, simply pull the cylinder upward, and the tapered opening continuously squeezes the chuck, and the clamping force increases with the pulling force, so that the broken waist-shaped stud can be completely removed in one go without damage, achieving the effects of convenient operation, reliable clamping, and improved efficiency. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention.

[0023] Figure 1 A schematic diagram of the overall structure of the present invention is shown.

[0024] Figure 2 An explosive structure diagram of the present invention is shown.

[0025] Figure 3 A schematic diagram of the clamping sleeve structure of the present invention is shown.

[0026] Figure 4 A cross-sectional view or structural schematic diagram of the present invention is shown.

[0027] Figure 5 A cross-sectional schematic diagram of the present invention is shown.

[0028] Figure 6 An enlarged structural schematic diagram of part A of the present invention is shown.

[0029] Figure 7 An enlarged schematic diagram of part B of the present invention is shown. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0031] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0032] Reference Figures 3-7 This embodiment provides a clamping sleeve, which includes,

[0033] The cylinder 1 has a first end and a second end. The first end of the cylinder 1 has a tapered constriction structure, and the inner wall of the tapered constriction is a tapered surface. The inner wall of the second end of the cylinder 1 is provided with a threaded groove.

[0034] The chuck 2 is located inside the conical constriction of the cylinder 1. The chuck 2 engages with the conical inner wall of the cylinder 1 and slides along the conical inner wall of the cylinder 1. When the waist-shaped rod stud 100 breaks at a smooth point, it is fitted onto the broken part of the waist-shaped rod stud 100 through the first end of the cylinder 1. During the fitting process, the waist-shaped rod stud 100 will push the internal chuck 2 to slide along the conical inner wall of the cylinder 1 until it reaches the diameter of the waist-shaped rod stud 100. At this time, under the action of gravity and with the design of the conical constriction of the cylinder 1, the chuck 2 will slide down and fit against the outer wall of the waist-shaped rod stud 100. Pulling the cylinder 1 upward will cause the chuck 2 to continuously squeeze the waist-shaped rod stud 100, thereby effectively fixing the waist-shaped rod stud 100. Pulling the cylinder 1 upward will complete the removal of the waist-shaped rod stud 100.

[0035] As one embodiment provided, such as Figures 3-5 The outer wall of the conical constriction structure of the cylinder 1 is provided with a sliding groove 11, and the claw 2 slides along the sliding groove 11 on the conical inner wall of the cylinder 1; under the guidance of the sliding groove 11, it can be ensured that the claw 2 can move along the specified track, thus ensuring the stability of the claw 2.

[0036] One end of the claw 2 is fixedly connected to a slider 21, and one end of the slider 21 is fixedly connected to a limit block 22. The slider 21 is located inside the slide groove 11 and slides along the slide groove 11. By sliding the slider 21 along the slide groove 11, the claw 2 can be moved along the slide groove 11. Under the action of the limit block 22, the claw 2 can be prevented from falling off the inner wall of the cylinder 1.

[0037] As one embodiment provided, such as Figures 4-7The inner wall of the conical inner wall of the cylinder 1 is provided with a ratchet groove 12, and the outer side of the chuck 2 is fixedly connected with a ratchet tooth 13, which engages with the ratchet groove 12. Under the action of the ratchet tooth 13 engaging with the ratchet groove 12, it can be ensured that when the chuck 2 clamps and fixes the waist-shaped rod stud 100, it can only move in one direction, thereby avoiding the chuck 2 from moving in the opposite direction and causing loosening. At the same time, it can also increase the contact area between the chuck 2 and the cylinder 1, further ensuring the stability of clamping.

[0038] As one embodiment provided, such as Figures 4-7 The thickness of the claw 2 is gradually distributed along the direction of the slide groove 11, gradually increasing from the end closer to the slider 21 to the end farther away from the slider 21; the gradual thickness of the claw 2 can ensure that the claw 2 can better fit with the waist-shaped rod stud 100, improve its friction, and thus effectively clamp the waist-shaped rod stud 100.

[0039] As one embodiment provided, such as Figures 4-7 The limiting block 22 is set with an angle 221 on the side near the conical opening of the cylinder 1. With the angle 221, when the cylinder 1 is fitted from the top waist-shaped rod stud 100, the waist-shaped rod stud 100 will abut against the bottom end of the claw 2 and drive the claw 2 to deflect towards the axis of the cylinder 1, causing the angle 221 of the limiting block to fit against the outer wall of the cylinder 1, thereby moving the ratchet 13 out from the inside of the ratchet groove 12. Then, when the cylinder 1 is fitted downwards, the waist-shaped rod stud 100 will drive the already deflected claw 2 to move upwards until it reaches the diameter of the waist-shaped rod stud 100. At this time, under the action of gravity and in conjunction with the conical opening of the cylinder 1, the claw 2 will slide down and fit against the outer wall of the waist-shaped rod stud 100, thereby completing the clamping of the waist-shaped rod stud 100.

[0040] In summary, when the waist-shaped stud 100 breaks, the tapered end of the first end of the cylinder 1 is fitted onto the broken stud from top to bottom. The stud end first pushes against the lower end of the pawl 2, causing the pawl 2 to deflect in the direction of the axis of the cylinder 1 with the slider 21 and the groove 11 as fulcrums. This deflection causes the chamfer 221 of the limiting block 22 to press against the outer wall of the cylinder 1, thereby forcibly pulling the ratchet 13 out of the ratchet groove 12. Once the ratchet 13 is separated from the ratchet groove 12, the downward fitting of the cylinder 1 will cause the already deflected pawl 2 to move upward through the waist-shaped stud 100 until it exceeds the waist-shaped stud 100. The maximum diameter of the stud 100; at this time, under the combined action of the tapered opening of the cylinder 1 and the weight of the chuck 2, the chuck 2 slides down the slide groove 11 and contracts radially due to the gradual change in thickness. The re-engaged ratchet 13 and ratchet groove 12 form a one-way lock, and the chuck 2 firmly clamps the waist-shaped stud 100; finally, simply pull the cylinder 1 upward, and the tapered opening continuously squeezes the chuck 2. The clamping force increases with the pulling force, and the broken waist-shaped stud 100 can be completely removed in one go without damage, achieving the effects of convenient operation, reliable clamping, and improved efficiency.

[0041] As one embodiment provided, such as Figure 1 , Figure 2 A blade bolt removal device includes a clamping sleeve, and further includes...

[0042] Hollow jack 3, hollow jack 3 is used to provide lifting force;

[0043] Remove the broken screw 4. The broken screw 4 is located inside the hollow jack 3, and the end of the broken screw 4 near the cylinder 1 is adapted to be connected to the cylinder 1.

[0044] The base cylinder 5 is located at the bottom of the hollow jack 3 and is used to increase the height of the hollow jack 3. By placing the base cylinder 5 on the top of the hub component mounting plate 200, then installing the break-off screw 4 inside the hollow jack 3 and ensuring that the break-off screw 4 is connected to the cylinder 1, the hollow jack 3 is finally placed on the base cylinder 5. At this time, starting the hollow jack 3 will drive the break-off screw 4 to move upward, thereby pulling the cylinder 1 until the waist-shaped rod stud 100 is removed. With the design of the base cylinder 5, the hollow jack 3 can be ensured to have sufficient working space. Even if the pitch bearing 300 and the blade flange 400 are misaligned, the waist-shaped rod stud 100 can be easily removed under the power of the hollow jack 3.

[0045] The outer thread of the detaching screw 4 is connected to a nut 41, and the end of the detaching screw 4 near the cylinder 1 is fixedly connected to a screw head 42; by placing the nut 41 at the top of the hollow jack 3, the detaching screw 4 can be limited, ensuring that the hollow jack 3 can lift the detaching screw 4.

[0046] The nut 41 is located at the top of the hollow jack 3, and the screw head 42 is used to connect the cylinder 1. The connection between the cut-off screw 4 and the cylinder 1 is completed by connecting the screw head 42 with the threaded groove at the second end of the cylinder 1.

[0047] An observation hole 51 is provided on the outer side of the bottom cylinder 5; the observation hole 51 is used to observe the real-time position during the operation.

[0048] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A clamping sleeve, characterized in that: include, The cylindrical body (1) has a first end and a second end. The first end of the cylindrical body (1) is a tapered constriction structure, and the inner wall of the tapered constriction part is a tapered surface. The claw (2) is disposed inside the conical constriction of the cylinder (1). The claw (2) engages with the conical inner wall of the cylinder (1) and slides along the conical inner wall of the cylinder (1).

2. The clamping sleeve according to claim 1, characterized in that: The outer wall of the conical constriction structure of the cylinder (1) is provided with a sliding groove (11), and the claw (2) slides along the sliding groove (11) on the conical inner wall of the cylinder (1).

3. The clamping sleeve according to claim 2, characterized in that: One end of the claw (2) is fixedly connected to a slider (21), and one end of the slider (21) is fixedly connected to a limit block (22). The slider (21) is located inside the groove (11), and the slider (21) slides along the groove (11).

4. The clamping sleeve according to claim 3, characterized in that: The inner wall of the conical inner wall of the cylinder (1) is provided with a ratchet groove (12), and the outer side of the pawl (2) is fixedly connected with a ratchet tooth (13), which engages with the ratchet groove (12).

5. The clamping sleeve according to claim 4, characterized in that: The thickness of the claw (2) is gradually distributed along the direction of the slide groove (11), gradually increasing from the end closer to the slider (21) to the end farther away from the slider (21).

6. The clamping sleeve according to claim 4 or 5, characterized in that: The limiting block (22) is set at an angle (221) on the side near the tapered opening of the cylinder (1).

7. A blade bolt removal device, characterized in that: Including the clamping sleeve according to any one of claims 1 to 6, further comprising: Hollow jack (3), the hollow jack (3) is used to provide lifting force; The screw (4) is removed, and the screw (4) is located inside the hollow jack (3), and the end of the screw (4) near the cylinder (1) is adapted to be connected to the cylinder (1); Bottom cylinder (5), the bottom cylinder (5) is located at the bottom end of the hollow jack (3), and the bottom cylinder (5) is used to increase the height of the hollow jack (3).

8. The blade bolt removal device according to claim 7, characterized in that: The outer thread of the break-off screw (4) is connected to a nut (41), and a screw head (42) is fixedly connected to one end of the break-off screw (4) near the cylinder (1); The nut (41) is located at the top of the hollow jack (3), and the screw head (42) is used to connect the cylinder (1).

9. The blade bolt removal device according to claim 8, characterized in that: An observation hole (51) is provided on the outer side of the bottom cylinder (5).

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