Clamping sleeve cylinder and puller for shovel bolts

Abstract

Clamping sleeve cylinder, characterized in that it comprises the following: a cylinder (1), wherein the cylinder (1) has a first end and a second end, wherein the first end of the cylinder (1) has a conical closure structure, and wherein an inner wall of a conical closure section is a conical surface; and a clamping jaw (2) wherein the clamping jaw (2) is provided within the conical closure section of the cylinder (1), wherein the clamping jaw (2) is adapted to the conical inner wall of the cylinder (1) and slides along the conical inner wall of the cylinder (1).

Description

Technical field

[0001] The present invention relates to the technical field of wind turbines, in particular a clamping sleeve cylinder and a withdrawal device for blade bolts. State of the art

[0002] In a wind turbine, the blade is the core component that converts wind energy into mechanical energy, and it is subjected to extreme operating conditions such as alternating loads, wind gusts, and sudden temperature changes over extended periods. To reliably secure the blade to the hub bearing, some models utilize a type of "waisted rod bolt"—the diameter of the threaded section at both ends is larger than that of the lighter rod section in the middle, resembling a "belt waist." This structure provides sufficient tensile / shear strength and a flexible transition between the blade root and the bearing, and is therefore considered an essential load-bearing element.

[0003] However, under long-term cyclic loading with high frequency and large amplitude, it is very likely that the bolt will develop fatigue cracks at the threaded head, where stresses concentrate. Combined with uneven preload or incorrect alignment of the spacer bearing during on-site assembly, these cracks propagate rapidly until the bolt fractures. Once the bolt fractures, the bucket loosens or is even ejected, leading to serious accidents such as the bucket tower shearing off and the machine collapsing.

[0004] Due to the specific "large thread - small light rod" structure of the tapered rod bolt, conventional extractors can only act on the surface of the threaded end. If the breakage occurs in the area of ​​the light rod, the fracture surface reduces the diameter and then loses the clamping portion. This, combined with the misalignment of the blade root spacer and bearing, results in a limited working space. Conventional tools are difficult to fix radially, making the remaining fracture difficult to repair. Overhaul efficiency is low, and the safety risk is high. Content of the present application

[0005] Therefore, the technical problem to be solved by the present invention is that once the waist-shaped rod bolt on the light rod has fatigued and broken, due to the special structure and limitation caused by misalignment, conventional tools cannot be clamped, and it is difficult to remove the remaining part safely and quickly.

[0006] The above technical problem is solved by the following technical solution: the present invention provides a clamping sleeve cylinder comprising the following: a cylinder, wherein the cylinder has a first end and a second end, wherein the first end of the cylinder has a conical closure structure, and wherein an inner wall of a conical closure section is a conical surface, wherein the cylinder is provided with a threaded groove on an inner wall of a second end; A clamping jaw, wherein the clamping jaw is provided within the conical closure section of the cylinder, the clamping jaw being adapted to the conical inner wall of the cylinder and sliding along the conical inner wall of the cylinder. If the waisted rod bolt breaks at a smooth point, it is inserted through the first end of the cylinder in the direction of the break of the waisted rod bolt; subsequently, the waisted rod bolt pushes the inner clamping jaw in sliding motions along the conical inner wall of the cylinder until it reaches the diameter of the waisted rod bolt.At this point, the clamping jaw is pushed downwards under the influence of gravity with the design of the conical closure of the cylinder and rests against the outer wall of the waisted rod bolt; at this point, the cylinder is pulled upwards, whereby the clamping jaw continuously compresses the waisted rod bolt to achieve the effective fastening of the waisted rod bolt, and by pulling the cylinder upwards, the removal of the waisted rod bolt is completed.

[0007] In a preferred embodiment of the clamping sleeve cylinder of the present invention, the conical closure structure of the cylinder is provided with a sliding groove on an outer wall, wherein the clamping jaw slides along the sliding groove on the conical inner wall of the cylinder. The guidance of the sliding groove 1 ensures that the clamping jaw can move in a specific path, thereby ensuring the stability of the clamping jaw.

[0008] In a preferred embodiment of the clamping sleeve cylinder of the present invention, one end of the clamping jaw is fixedly connected to a sliding block, wherein one end of the sliding block is fixedly connected to a limiting block, the sliding block being located within the sliding groove, and wherein the sliding block slides along the sliding groove. By sliding the sliding block along the sliding groove, the clamping jaw can be moved along the sliding groove, and under the action of the limiting block, the clamping jaw can be prevented from falling off the inner wall of the cylinder.

[0009] In a preferred embodiment of the clamping sleeve cylinder of the present invention, the conical inner wall of the cylinder is provided with a pawl groove, wherein an outer surface of the clamping jaw is firmly connected to a pawl tooth, the pawl tooth being clamped in the pawl groove. The clamping action of the pawl teeth and the pawl groove ensures that, when clamping and securing the waisted rod bolt, the clamping jaw can only be moved in one direction, thus preventing the clamping jaw from moving in the opposite direction and causing loosening. At the same time, this also improves the contact area between the clamping jaw and the cylinder, further ensuring the stability of the clamping.

[0010] In a preferred embodiment of the clamping sleeve cylinder of the present invention, the thickness of the clamping jaw varies gradually in steps along the direction of the sliding groove, with the thickness gradually increasing from an end facing the sliding block to an end facing away from the sliding block. This gradual increase in the thickness of the clamping jaw ensures that the clamping jaw fits better with the waisted rod bolt and improves its friction to effectively clamp the waisted rod bolt.

[0011] In a preferred embodiment of the clamping sleeve cylinder of the present invention, the side of the limiting block facing the conical closure of the cylinder is provided with a chamfered angle. With this chamfered angle, when the cylinder is mounted from the upper end of the waisted rod bolt, the waisted rod bolt rests against the lower end of the clamping jaw at that point and causes the clamping jaw to bend along the axis of the cylinder. This causes the chamfered angle of the limiting block to bear against the outer wall of the cylinder, disengaging the pawl teeth from the inner part of the pawl groove. The cylinder is then mounted downwards, and the waisted rod bolt moves the already deflected clamping jaw upwards until it reaches the diameter of the waisted rod bolt.At this point, the clamping jaw is pushed downwards under the influence of gravity with the design of the conical closure of the cylinder and rests against the outer wall of the waisted rod bolt, thus completing the clamping of the waisted rod bolt.

[0012] The present invention further provides a puller device for shovel bolts, comprising a clamping sleeve cylinder and furthermore the following: a hollow jack, wherein the hollow jack is used to provide lifting power; a puller screw, wherein the puller screw is located inside the hollow lifter, and wherein an end of the puller screw facing the cylinder is connected to the cylinder in an adaptable manner; a lower cylinder, wherein the lower cylinder is located at a lower end of the hollow jack, and wherein the lower cylinder is used to increase the height of the hollow jack.The lower cylinder is placed against the upper end of the hub component's mounting plate. The puller screw is then installed inside the hollow jack, ensuring it is connected to the cylinder. Finally, the hollow jack is placed onto the lower cylinder. At this point, activating the hollow jack moves the puller screw upwards, pulling the cylinder until the waisted rod bolt is removed. The design of the lower cylinder ensures the hollow jack has sufficient working space, allowing for easy removal of the waisted rod bolt under the force of the hollow jack, even in the event of misalignment of the pitch bearing and blade flange.

[0013] In a preferred embodiment of the shovel bolt puller of the present invention, a nut is screwed onto an outer side of the puller screw, with a screw head being firmly connected to an end of the puller screw facing the cylinder. If the nut 41 is located at the upper end of the hollow lifter, the puller screw can be limited, thus ensuring that the hollow lifter can lift the puller screw.

[0014] In a preferred embodiment of the shovel bolt puller of the present invention, the nut is located at an upper end of the hollow lifter, with the screw head being used to connect the cylinder. The connection between the puller bolt and the cylinder is completed by engaging the screw head with the threaded groove at the other end of the cylinder.

[0015] In a preferred embodiment of the puller for shovel bolts of the present invention, an observation hole is formed on the outside of the lower cylinder. The observation hole serves to monitor the position in real time during operation.

[0016] The present invention has the following advantageous effects: When the waisted rod bolt breaks, the conical locking section at the first end of the cylinder is placed onto the broken rod from top to bottom, the rod end initially presses against the lower end of the clamping jaw, so that the clamping jaw, with the sliding block and the sliding groove as its pivot point in the axis of the cylinder, produces a deflection; due to the deflection, the chamfered angle of the limiting block presses against the outer wall of the cylinder, thereby forcing the pawl teeth out of the pawl groove; once the pawl teeth and the pawl groove are separated, the cylinder is placed downwards and moves the deflected clamping jaw upwards through the waisted rod bolt until it exceeds the maximum diameter of the waisted rod bolt;At this point, under the combined action of the cylinder's conical closure and the clamping jaw's own weight, the clamping jaw slides downwards along the slide and contracts radially due to the gradual thickness, with the pawl teeth and the pawl groove re-engaging to form a unidirectional lock, firmly clamping the waisted rod bolt. Finally, only the cylinder is pulled upwards, the conical closure continuously presses the clamping jaw, and the clamping force increases with the pulling force. This allows for a single, non-destructive, and complete removal of the broken waisted rod bolt, resulting in convenient operation, reliable clamping, and improved efficiency. Brief description of the drawing

[0017] To better illustrate the technical solutions of the exemplary embodiment of the present invention, the accompanying drawings of the exemplary embodiments of the present invention are briefly described below. It will be clear that the accompanying drawings in the following description relate only to some exemplary embodiments of the present invention and do not represent a limitation of the invention. Fig. Figure 1 shows a schematic representation of the overall structure of the present invention; Fig. Figure 2 shows a schematic representation of the explosion structure of the present invention; Fig. Figure 3 shows a schematic representation of the structure of a clamping sleeve cylinder of the present invention; Fig. Figure 4 shows a schematic representation of the structure of a first section of the present invention; Fig. Figure 5 shows a schematic representation of the structure of a second section of the present invention; Fig. Figure 6 shows an enlarged schematic representation of the structure of Part A of the present invention; Fig. Figure 7 shows an enlarged schematic representation of the structure of part B of the present invention. Detailed description of the embodiments

[0018] In order to enable the person skilled in the art to better understand the present invention, a detailed description of the present invention follows in conjunction with the specific embodiments and the attached drawings.

[0019] The terms used in the present invention are general terms that are currently widely used in the field of the functionality of the present invention. However, these terms may be varied according to the intention of a person skilled in the art, a precedent, or a new technology in the field. Furthermore, certain terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the comprehensive description of the present invention. Accordingly, the terms used in the description are not to be understood as mere designations, but rather as being based on the meaning of the terms and the general description of the present invention.

[0020] As in Fig. As shown in Figures 3 to 7, the embodiment provides a clamping sleeve cylinder comprising the following: a cylinder 1, wherein the cylinder 1 has a first end and a second end, wherein the first end of the cylinder 1 has a conical closure structure, and wherein an inner wall of a conical closure structure is a conical surface, wherein the cylinder 1 is provided with a threaded groove on an inner wall of a second end; A clamping jaw 2, wherein the clamping jaw 2 is provided within the conical closure section of the cylinder 1, wherein the clamping jaw 2 is adapted to the conical inner wall of the cylinder 1 and slides along the conical inner wall of the cylinder 1. If the waisted rod bolt 100 breaks at a smooth point, it is inserted through the first end of the cylinder 1 in the direction of the break of the waisted rod bolt 100; subsequently, the waisted rod bolt 100 pushes the inner clamping jaw 2 in sliding motions along the conical inner wall of the cylinder 1 until it reaches the diameter of the waisted rod bolt 100.At this point, the clamping jaw 2 is pushed downwards under the influence of gravity with the design of the conical closure of the cylinder 1 and rests against the outer wall of the waisted rod bolt 100; at this point, the cylinder 1 is pulled upwards, whereby the clamping jaw 2 continuously compresses the waisted rod bolt 100 to achieve the effective fastening of the waisted rod bolt 100, and by pulling the cylinder 1 upwards, the removal of the waisted rod bolt 100 is completed.

[0021] In a provided embodiment, as in Fig. As shown in Figures 3 to 5, the conical closure structure of the cylinder 1 is provided with a sliding groove 11 on an outer wall, wherein the clamping jaw 2 slides along the sliding groove 11 on the conical inner wall of the cylinder 1. The guidance provided by the sliding groove 1 ensures that the clamping jaw 2 can move in a specific path, thereby ensuring the stability of the clamping jaw 2.

[0022] One end of the clamping jaw 2 is rigidly connected to a sliding block 21, the other end of which is rigidly connected to a limiting block 22. The sliding block 21 is located within the sliding groove 11 and slides along the sliding groove 11. The sliding of the sliding block 21 along the sliding groove 11 allows the clamping jaw 2 to be moved along the sliding groove 11, and the limiting block 22 prevents the clamping jaw 2 from falling off the inner wall of the cylinder 1.

[0023] In a provided embodiment, as in Fig. As shown in Figures 4 to 7, the conical inner wall of the cylinder 1 is provided with a pawl groove 12, wherein an outer surface of the clamping jaw 2 is firmly connected to a pawl tooth 13, the pawl tooth 13 being clamped in the pawl groove 12. The clamping action of the pawl teeth 13 and the pawl groove 12 ensures that when the clamping jaw 2 clamps and secures the waist-shaped rod bolt 100, it can only move in one direction, thus preventing the clamping jaw 2 from moving in the opposite direction and causing loosening. At the same time, it also improves the contact area between the clamping jaw 2 and the cylinder 1, further ensuring the stability of the clamping.

[0024] In a provided embodiment, as in Fig. As shown in Figures 4 to 7, the thickness of the clamping jaw 2 gradually varies in steps along the direction of the sliding groove 11, with the thickness gradually increasing from an end facing the sliding block 21 to an end facing away from the sliding block 21. This gradual thickness of the clamping jaw 2 ensures that the clamping jaw 2 fits better with the waisted rod bolt 100 and improves its friction to effectively clamp the waisted rod bolt 100.

[0025] In a provided embodiment, as in Fig. As shown in Figures 4 to 7, the side of the limiting block 22 facing the conical closure of the cylinder 1 is provided with a chamfered angle 221. Due to the design of the chamfered angle 221, when the cylinder 1 is placed onto the cylinder 1 from its upper end, the tapered rod 100 rests against the lower end of the clamping jaw 2 and causes the clamping jaw 2 to bend along the axis of the cylinder 1. This causes the chamfered angle 221 of the limiting block to bear against the outer wall of the cylinder 1, disengaging the pawl teeth 13 from the inner part of the pawl groove 12. The cylinder 1 is then placed downwards, and the already deflected clamping jaw 2 is moved upwards by the tapered rod 100 until it reaches the diameter of the tapered rod 100.At this point, the clamping jaw 2 is pushed downwards under the influence of gravity with the design of the conical closure of the cylinder 1 and rests against the outer wall of the waisted rod bolt 100, thus completing the clamping of the waisted rod bolt 100.

[0026] In summary, when the waisted rod bolt 100 breaks, the conical locking section at the first end of the cylinder 1 is placed onto the broken rod from top to bottom. The rod end initially presses against the lower end of the clamping jaw 2, causing the clamping jaw 2, with the sliding block 21 and the sliding groove 11 as its pivot point in the axis of the cylinder 1, to deflect. This deflection causes the chamfered angle 221 of the limiting block 22 to press against the outer wall of the cylinder 1, forcing the pawl teeth 13 out of the pawl groove 12. Once the pawl teeth 13 and the pawl groove 12 are separated, the cylinder 1 is pushed downwards and moves the deflected clamping jaw 2 upwards through the waisted rod bolt 100 until it exceeds the maximum diameter of the waisted rod bolt 100.At this point, under the combined action of the conical closure of the cylinder and the weight of the clamping jaw 2, the clamping jaw 2 slides downwards along the slide 11 and contracts radially due to the gradual thickness, whereby the pawl teeth 13 and the pawl groove 12 re-engage to form a unidirectional locking mechanism, with the clamping jaw 2 firmly clamping the waisted rod bolt 100; Finally, only the cylinder 1 is pulled upwards, the conical closure continuously presses the clamping jaw 2, the clamping force increases with the pulling force, a single, non-destructive and complete removal of the broken waisted rod bolt 100 can be achieved, resulting in convenient operation, reliable clamping and improved efficiency.

[0027] In a provided embodiment, as in Fig. 1 and Fig.Figure 2 shows a puller device for shovel bolts, comprising a clamping sleeve cylinder and furthermore the following: a hollow jack 3, wherein the hollow jack 3 is used to provide lifting power; a puller screw 4, wherein the puller screw 4 is located inside the hollow lifter 3, and wherein an end of the puller screw 4 facing the cylinder 1 is connected to the cylinder 1 in an adapting manner; a lower cylinder 5, wherein the lower cylinder 5 is located at a lower end of the hollow lifter 3, and wherein the lower cylinder 5 is used to increase the height of the hollow lifter 3.The lower cylinder 5 is placed against the upper end of the mounting plate 200 of the hub component, then the puller screw 4 is installed inside the hollow jack 3, and it is ensured that the puller screw 4 is connected to the cylinder 1, and finally the hollow jack 3 is placed against the lower cylinder 5; at this point, by activating the hollow jack 3, the puller screw 4 is moved upwards, thereby pulling the cylinder 1 until the waisted rod bolt 100 is removed; the design of the lower cylinder 5 ensures that the hollow jack 3 has sufficient working space so that even if the pitch bearing 300 and the blade flange 400 are misaligned, the waisted rod bolt 100 can be easily removed under the force of the hollow jack 3.

[0028] A nut 41 is screwed onto an outer surface of the puller screw 4, with a screw head 42 being firmly connected to an end of the puller screw 4 facing the cylinder 1. If the nut 41 is located at the upper end of the hollow lifter 3, the puller screw 4 can be limited, thus ensuring that the hollow lifter 3 can lift the puller screw 4.

[0029] The nut 41 is located at one upper end of the hollow lifter 3, with the screw head 42 being used to connect the cylinder 1. The connection between the puller screw 4 and the cylinder 1 is completed by the engagement of the screw head 42 with the threaded groove at the other end of the cylinder 1.

[0030] An observation hole 51 is formed on the outside of the lower cylinder 5. The observation hole 51 serves to observe the position in real time during operation.

[0031] Finally, it should be noted that the methods and devices described in detail above are only exemplary embodiments which the person skilled in the art can modify in different ways, as long as he does not deviate from the scope of application of the present invention.

Claims

[1] Clamping sleeve cylinder, characterized by that it includes the following: a cylinder (1), wherein the cylinder (1) has a first end and a second end, wherein the first end of the cylinder (1) has a conical closure structure, and wherein an inner wall of a conical closure section is a conical surface; and a clamping jaw (2) wherein the clamping jaw (2) is provided within the conical closure section of the cylinder (1), wherein the clamping jaw (2) is adapted to the conical inner wall of the cylinder (1) and slides along the conical inner wall of the cylinder (1). [2] Clamping sleeve cylinder according to claim 1, characterized by , that the conical closure structure of the cylinder (1) is provided on an outer wall with a sliding groove (11), wherein the clamping jaw (2) slides along the sliding groove (11) on the conical inner wall of the cylinder (1). [3] Clamping sleeve cylinder according to claim 2, characterized by, that one end of the clamping jaw (2) is fixedly connected to a sliding block (21), wherein one end of the sliding block (21) is fixedly connected to a limiting block (22), wherein the sliding block (21) is located within the sliding groove (11), and wherein the sliding block (21) slides along the sliding groove (11). [4] Clamping sleeve cylinder according to claim 3, characterized by , that the conical inner wall of the cylinder (1) is provided on the inner wall with a ratchet groove (12), wherein an outer side of the clamping jaw (2) is firmly connected to a ratchet tooth (13), wherein the ratchet tooth (13) is clamped into the ratchet groove (12). [5] Clamping sleeve cylinder according to claim 4, characterized by , that the thickness of the clamping jaw (2) gradually varies stepwise along the direction of the sliding groove (11), with the thickness gradually increasing from an end facing the sliding block (21) to an end facing away from the sliding block (21). [6] Clamping sleeve cylinder according to claim 4 or 5, characterized by , that the side of the limiting block (22) facing the conical closure of the cylinder (1) is provided with a chamfered angle (221). [7] Shovel bolt puller, characterized by , that it comprises a clamping sleeve cylinder according to one of claims 1 to 6 and furthermore the following: a hollow jack (3), wherein the hollow jack (3) is used to provide lifting power; a puller screw (4) wherein the puller screw (4) is located inside the hollow lifter (3), and wherein an end of the puller screw (4) facing the cylinder (1) is connected to the cylinder (1) in an adaptable manner; a lower cylinder (5), wherein the lower cylinder (5) is located at a lower end of the hollow lifter (3), and wherein the lower cylinder (5) is used to increase the height of the hollow lifter (3). [8] Puller for shovel bolts according to claim 7, characterized by, that a nut (41) is screwed onto an outside of the puller screw (4), wherein a screw head (42) is firmly connected to an end of the puller screw (4) facing the cylinder (1); wherein the nut (41) is located at an upper end of the hollow lifter (3), wherein the screw head (42) is used to connect the cylinder (1). [9] Puller for shovel bolts according to claim 8, characterized by , that an observation hole (51) is formed on the outside of the lower cylinder (5).

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