Prestress inhaul cable conversion structure for wind power tower drum

Abstract

The invention relates to the technical field of wind power tower drum auxiliary devices, in particular to a prestress inhaul cable conversion structure for a wind power tower drum, which comprises a tower drum restraining component and an inhaul cable, a sliding component is arranged on the tower drum restraining component, and the tower drum restraining component is fixed in the tower drum; the middle of the inhaul cable stretches across the tower tube restraining part and is in sliding connection with the tower tube restraining part through the sliding part, the two ends of the inhaul cable are connected with the ground, and pre-pulling stress can be applied to the inhaul cable; according to the technical scheme, it can be guaranteed that the inhaul cables and the wind power tower tube bear loads together under any condition, meanwhile, the stress state of the wind power tower tube can be improved on the premise that the dead weight of the wind power tower tube is not obviously increased, the stability and safety of the wind power tower tube are enhanced, and the wind power tower tube is protected. And furthermore, the wind turbine generator can be used at a higher height, so that wind energy can be better utilized for power generation.

Description

Technical Field

[0001] The invention relates to the technical field of wind power tower auxiliary devices, and in particular to a prestressed cable conversion structure for a wind power tower. Background Art

[0002] In the near-ground layer, the wind speed increases significantly with the increase of height. In order to obtain a large amount of wind power energy, it is usually necessary to design the wind turbine tower to be relatively high. Therefore, there are also some problems related to this. For example, if the height is too high, the cross-sectional bending moment generated is also very large, which can easily cause the structure to have a large lateral displacement and damage, and it can also easily cause the structure to fail in stability. In order to improve the lateral displacement stiffness and structural stability of the wind turbine tower, in the prior art, a number of rods are usually used to support the wind turbine tower. This method can effectively solve the above problems, but it also has some defects. For example, after the wind turbine tower has a lateral displacement on one side, stress relaxation will occur, that is, only some rods remain in a tensile state and other rods are in a compressive state, which will greatly reduce the effect of the support rods. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a prestressed cable conversion structure for a wind turbine tower, which is used to solve the technical problem that when the wind turbine tower shifts sideways, some cables are subjected to tension and other cables are subjected to pressure, resulting in relaxation.

[0004] To achieve the above-mentioned purpose, the present invention provides a prestressed cable conversion structure for a wind power tower, comprising a tower constraint component and a cable, wherein the tower constraint component is provided with a sliding component, and the tower constraint component is fixed in the tower; the middle part of the cable spans the tower constraint component and is slidably connected to the tower constraint component through the sliding component, the two ends of the cable are connected to the ground, and the cable can be applied with prestress.

[0005] Optionally, the tower restraining component includes a cable bracket and a bearing assembly for bearing the cable bracket, the bearing assembly is connected to the tower, and the sliding component is arranged on the cable bracket.

[0006] Optionally, the cable bracket includes multiple groups of cable support rods, the sliding component is arranged at the upper end of the cable support rod, a spacing S is left between the horizontal planes where the upper ends of the multiple groups of cable support rods are located, and the spacing S is greater than the diameter of the cable; the number of the cables is the same as the number of groups of the cable support rods, the multiple cables correspond one-to-one to the multiple groups of cable support rods, and the multiple cables are staggered.

[0007] Optionally, the cable support rod includes a cable support rod A and a cable support rod B, the lower ends of the cable support rod A and the cable support rod B are respectively vertically connected to the bearing assembly, the upper ends are provided with the sliding component, the cable support rod A and the cable support rod B are parallel to each other and have a distance between them.

[0008] Optionally, the longitudinal planes where the cable supports of each group are located are staggered.

[0009] Optionally, the cable bracket also includes multiple auxiliary rods, the cable support rod A and the cable support rod B respectively correspond to one auxiliary rod, the auxiliary rod is located on the opposite side of the cable support rod A and the cable support rod B, the upper end of the auxiliary rod is connected to the middle part of the cable support rod, and the lower end is connected to the bearing assembly, and the auxiliary rod is inclined relative to the cable support rod and the bearing assembly.

[0010] Optionally, the cable support rods are in two groups, namely a first group of cable support rods and a second group of cable support rods, the first group of cable support rods are higher than the second group of cable support rods, and the longitudinal plane where the first group of cable support rods are located is perpendicular to the longitudinal plane of the second group of cable support rods.

[0011] Optionally, the bearing assembly includes an annular component and a reinforcement frame, the reinforcement frame is located on the inner side of the annular component and connected to its inner wall, the annular component is connected to the lower end of the cable support rod, and the reinforcement frame is connected to the lower end of the auxiliary rod; the annular component is connected to the tower.

[0012] Optionally, the bearing assembly is connected to the tower via a stabilizing platform, the cross-section of the stabilizing platform is circular, and the side wall of the stabilizing platform is connected to the inner wall of the wind turbine tower.

[0013] Optionally, a plurality of connecting rods are provided at the lower end of the stabilizing platform, the lower ends of the connecting rods are connected to the bearing assembly, and the upper ends of the connecting rods are connected to the stabilizing platform.

[0014] The beneficial effect of the principle of the present invention is that during installation, pre-tensioning stress is applied to the cable to ensure that the cable is always tensioned. When the wind turbine tower is laterally displaced in a certain direction, the lateral displacement can be decomposed into the lateral displacement of the tower constraint component, and the middle part of the cable has a sliding connection with the tower constraint component. Therefore, when the wind turbine tower is offset in various directions, only the fixed tower constraint component is driven to offset, and the cable slides relative to the tower constraint component, so that the axial force on the cable is always maintained as tension. Based on the above factors, it can be ensured that the cable and the wind turbine tower bear the load together under any circumstances. In addition, the present invention can improve the stress state of the wind turbine tower without significantly increasing the deadweight of the wind turbine tower, enhance the stability and safety of the wind turbine tower, and further enable the wind turbine set to be used at a higher altitude, so as to better utilize wind energy for power generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure from one viewing angle of this embodiment; Figure 2 This is a schematic diagram of the structure of another perspective of this embodiment; Figure 3 for Figure 2 A local enlarged view of the N position in the middle; Figure 4 is a schematic diagram of the three-dimensional structure of the tower restraining component; Figure 5 This is a schematic diagram of the structure of the present embodiment after being applied to a wind power tower; Figure 6 This is a schematic diagram of the working state of the embodiment when the wind turbine tower is laterally displaced to the left after the embodiment is applied to the wind turbine tower (the wind turbine tower is shown in cross section); Figure 7 This is a schematic diagram of the working state of the embodiment when the wind turbine tower is laterally displaced to the right after the embodiment is applied to the wind turbine tower (the wind turbine tower is shown in cross section); Description of reference numerals: 1. tower restraint component, 1101. first group of cable support rods A, 1102. first group of cable support rods B, 1201. second group of cable support rods A, 1202. second group of cable support rods B, 13. slide groove, 14. auxiliary rod, 15. bearing assembly, 1501. annular component, 1502. reinforcement frame, 16. sliding component; 2. Stabilizing platform, 3. Cable, 4. Connecting rod, 5. Tower. DETAILED DESCRIPTION

[0016] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0017] It should be noted that the diagram provided in the present embodiment only illustrates the basic concept of the present invention in a schematic manner, so the diagram only shows the units related to the present invention rather than drawing according to the number, shape and size of the units during actual implementation. The pattern, quantity and ratio of each unit during actual implementation can be a random change, and its unit layout pattern may also be more complicated. The structure, ratio, size, etc. illustrated by the drawings in the present specification are only used to match the content disclosed in the specification, so that people familiar with this technology can understand and read, and are not used to limit the limiting conditions that the present invention can implement, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect that the present invention can produce and the purpose that can be achieved, should still fall within the scope of the technical content disclosed by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of narration, and are not used to limit the scope of the present invention. The change or adjustment of its relative relationship should also be regarded as the scope of the present invention without substantially changing the technical content.

[0018] The present embodiment provides a prestressed cable conversion structure for a wind turbine tower 5, comprising a tower constraint component 1 and a cable 3, wherein the tower constraint component 1 is provided with a sliding component 16, and the tower constraint component 1 is fixed in the tower 5; the middle part of the cable 3 spans the tower constraint component 1, and is slidably connected to the tower constraint component 1 through the sliding component 16, and both ends of the cable 3 are connected to the ground, and the cable 3 can be applied with prestress.

[0019] The present invention is applied to a wind power tower 5, and the tower restraint component 1 is fixed inside the tower 5, and can be welded to the tower 5, or can be other fixed connection methods with the tower 5. The specific connection position of the tower restraint component 1 and the tower 5 can be determined according to actual needs. In other words, the distance between the tower restraint component 1 and the ground can be adjusted according to the actual project, so as to optimize the stress condition of the cable 3 and meet the relevant requirements of the actual project construction. Through holes are preset on the tower 5 corresponding to the parts through which the cables 3 need to pass (not specifically shown in the figure). One end of the cable 3 is passed through one of the through holes on the tower 5, then bypasses the sliding component 16, and then passes through another corresponding through hole on the tower 5, while ensuring that the middle part of the cable 3 is correspondingly slidably connected to the sliding component 16; then one end of the cable 3 is first fixedly connected to the ground and pre-tensioned stress is applied, and then the other end of the cable 3 is fixedly connected to the ground. Since the pre-tensioned stress is applied to the cable 3, it can be ensured that each section of the cable 3 is subjected to tension, and the deflection of the cable 3 caused by its own weight can be effectively reduced, so that the force on the cable 3 is uniform and stable, thereby improving the working performance of the cable 3.

[0020] The present invention is installed in the middle of the wind turbine tower 5. By constraining the middle of the wind turbine tower 5, the stability of the wind turbine tower 5 is enhanced, thereby improving the problem of self-stability failure of the wind turbine tower 5 caused by too large a slenderness ratio. The connection structure of the cable 3 and the tower constraint component 1 of the present invention enables the cable 3 to also participate in energy consumption when the wind turbine tower 5 resists extreme disasters, thereby improving the ability of the wind turbine tower 5 to resist extreme natural disasters.

[0021] When the wind turbine tower 5 deviates to the left and right directions of the longitudinal plane where the cable 3 is located, the axial force on the cable 3 is all tensile force; when the wind turbine tower 5 is laterally displaced in a certain direction, the lateral displacement can be decomposed into the lateral displacement on the tower constraint component 1, and the middle part of the cable 3 has a sliding connection with the tower constraint component 1, so when the wind turbine tower 5 deviates in all directions, the axial force on the cable 3 is all tensile force. Specifically, when the wind turbine tower 5 deviates, the cable 3 slides relative to the sliding component 16, because the cable 3 is pre-stressed in advance, so it can be ensured that the cable 3 is always tensioned. Based on the above factors, it can be ensured that the cable 3 and the wind turbine tower 5 bear the load together under any circumstances. In addition, the present invention can improve the stress state of the wind turbine tower 5 without significantly increasing the deadweight of the wind turbine tower 5, enhance the stability and safety of the wind turbine tower 5, and further enable the wind turbine set to be used at a higher height, so as to better utilize wind energy for power generation.

[0022] Furthermore, the tower restraint component 1 includes a cable bracket and a bearing assembly 15 for bearing the cable bracket. The bearing assembly 15 is connected to the tower 5, that is, the bearing assembly 15 serves as an intermediate piece for indirectly connecting the cable bracket and the tower 5, so that the connection structure is more stable. The sliding component 16 is arranged on the cable bracket, and the sliding component 16 is a pulley.

[0023] The cable bracket includes multiple groups of cable support rods, and the sliding component 16 is arranged at the upper end of the cable support rod. A spacing S is left between the horizontal planes where the upper ends of the multiple groups of cable support rods are located, and the spacing S is greater than the diameter of the cable 3, that is, the horizontal planes where the upper ends of the multiple groups of cable support rods are located are all staggered. In other words, the upper ends of a single group of cable support rods are located in a horizontal plane, and the horizontal planes where the upper ends of each group of cable support rods are located do not overlap. It can also be understood that the height of each group of cable support rods is not The same, leaving space for each of the cables 3 to move freely; the number of the cables 3 is the same as the number of groups of the cable support rods, and the multiple cables 3 correspond to the multiple groups of the cable support rods one by one, and the multiple cables 3 are staggered, so that each group of the cable support rods can independently correspond to one cable 3, and the multiple cables 3 do not contact each other, that is, the parts where the multiple cables 3 are connected to the cable support rods have a spacing in the vertical direction, so as to avoid the multiple cables 3 contacting each other and affecting their performance. The existence of multiple cables 3 adds a force system to the wind turbine tower 5, improves the problem of large cross-sectional bending moment caused by the large height of the wind turbine tower 5, and can enhance the ductility and energy consumption capacity of the wind turbine tower 5, and further makes it difficult for the wind turbine tower 5 to produce large brittle deformation and lose its bearing capacity under extreme disasters such as earthquakes and typhoons.

[0024] Furthermore, the cable support rod comprises a cable support rod A and a cable support rod B. The lower ends of the cable support rod A and the cable support rod B are respectively vertically connected to the bearing assembly 15, and the sliding component 16 is arranged at the upper ends. The cable support rod A and the cable support rod B are parallel to each other and have a spacing between them. The cable support rod A and the cable support rod B of the same group have the same height and are both square rod-shaped structures. The upper end of the cable support rod A is recessed downward to form a slide groove 13. The interior of the slide groove 13 is a groove cavity, and the groove cavity runs through two opposite longitudinal side walls of the slide groove 13. The structures of the cable support rod A and the cable support rod B are the same. The transverse axis of the groove cavity on the cable support rod A is axis A, and the transverse axis of the groove cavity on the cable support rod B is axis B. The axis A coincides with the axis B. It can also be said that the groove cavity on the cable support rod A and the groove cavity on the cable support rod B are in the same direction. The sliding component 16 is installed in the slide groove 13, and the middle part of the cable 3 is slidably connected to the sliding component 16 at the upper end of the cable support rod A and the cable support rod B. After the cable 3 is installed on the cable support rod, the part of the cable 3 located between the cable support rod A and the cable support rod B is parallel to the horizontal plane. When the wind turbine tower 5 is laterally displaced in a certain direction, the lateral displacement of the wind turbine tower 5 can be decomposed into the lateral displacement occurring in the plane where the cable support rod is located. It can also be understood that the lateral displacement of the wind turbine tower 5 can be decomposed into the lateral displacement occurring in the plane where the cable 3 is located, so that the axial force on the cable 3 is all tensile force.

[0025] Preferably, the longitudinal planes where the cable support rods of each group are located are all staggered. Specifically, the cable support rods A and the cable support rods B of a single group are located in the same longitudinal plane, and there is an angle between the longitudinal planes where the cable support rods of each group are located, that is, the longitudinal planes where the cable support rods of each group are located do not overlap. Because the longitudinal planes where the cable support rods of each group are located are all staggered, and the distribution position of the cable bracket determines the distribution direction of the cable 3, after the middle part of the cable 3 is slidably connected with the cable support rod, multiple cables 3 are distributed in multiple directions, which increases the tension in multiple directions of the wind turbine tower 5, so that the force on the wind turbine tower 5 is more balanced. The midpoint of the distance between each group of cable support rods A and the cable support rods B is located on the same longitudinal straight line.

[0026] Furthermore, the cable bracket also includes multiple auxiliary rods 14, the cable support rod A and the cable support rod B respectively correspond to one auxiliary rod 14, the auxiliary rod 14 is located on the opposite side of the cable support rod A and the cable support rod B, the upper end of the auxiliary rod 14 is connected to the middle part of the cable support rod, and the lower end is connected to the bearing assembly 15. Specifically, each group of the cable bracket corresponds to two auxiliary rods 14, and the two auxiliary rods 14 correspond to the cable support rod A and the cable support rod B one by one, respectively. The upper end of one auxiliary rod 14 is connected to the middle part of the cable support rod A, and the upper end of the other auxiliary rod 14 is connected to the middle part of the cable support rod B. The auxiliary rods 14 are inclined relative to the cable support rod and the bearing assembly 15. In this embodiment, the lower ends of multiple auxiliary rods 14 are connected to the middle part of the bearing assembly 15.

[0027] In this embodiment, the cable support rods are in two groups, namely, the first group of cable support rods and the second group of cable support rods. The first group of cable support rods are higher than the second group of cable support rods. The longitudinal plane where the first group of cable support rods are located is perpendicular to the longitudinal plane where the second group of cable support rods are located. There are two cables 3. After the two cables 3 are respectively installed on the first group of cable support rods and the second group of cable support rods, the longitudinal planes where the two cables 3 are located are also perpendicular to each other. Specifically, the first group of cable support rods includes the first group of cable support rods A1101 and the first group of cable support rods B1102, and the second group of cable support rods includes the second group of cable support rods A1201 and the second group of cable support rods B1202.

[0028] The plurality of groups of cable support rods and the plurality of cables 3 are provided, and the middle of the cables 3 is slidably connected to the cable support rod, and the two ends are connected to the ground, and the cables 3 are arranged in a corresponding orientation, so that in any case, each section of the cables 3 is only subjected to tension, and does not cause some cables 3 to be subjected to pressure while some cables 3 are relaxed. When the wind turbine tower 5 is laterally displaced in a certain direction, the lateral displacement can be decomposed into the lateral displacement occurring in the plane where the cable support is located, so that the axial force on the cables 3 is all tension.

[0029] Furthermore, the bearing assembly 15 includes an annular component 1501 and a reinforcement frame 1502, the reinforcement frame 1502 is located on the inner side of the annular component 1501 and connected to its inner wall, the annular component 1501 is connected to the lower end of the cable support rod, and the reinforcement frame 1502 is connected to the lower end of the auxiliary rod 14; the annular component 1501 is connected to the tower 5.

[0030] Preferably, the bearing assembly 15 is connected to the tower 5 through a stabilizing platform 2, the cross section of the stabilizing platform 2 is circular, and the side wall of the stabilizing platform 2 is connected to the inner wall of the wind turbine tower 5. Further, a plurality of connecting rods 4 are provided at the lower end of the stabilizing platform 2, the lower end of the connecting rod 4 is connected to the bearing assembly 15, and the upper end is connected to the stabilizing platform 2. Specifically, the lower end of the connecting rod 4 is vertically connected to the annular component 1501, and the upper end is vertically connected to the stabilizing platform 2, and the stabilizing platform 2 is connected to the tower 5. In this embodiment, the stabilizing platform 2 is a columnar structure, and the tower restraint component 1 is located below the stabilizing platform 2, that is, the cable support rod and the bearing assembly 15 are both located below the stabilizing platform 2. A spacing is left in the vertical direction between the stabilizing platform 2 and the upper end of the first group of cable support rods, which is convenient for the installation of the cable 3 and does not affect the movement of the cable 3.

[0031] Preferably, the annular component 1501 is a square ring, the reinforcing frame 1502 is a "cross" structure, the annular component 1501 includes a first ring segment, a second ring segment, a third ring segment and a fourth ring segment, the first ring segment and the third ring segment are parallel to each other, the second ring segment and the fourth ring segment are parallel to each other, the two ends of the first ring segment are respectively vertically connected to one end of the second ring segment and the fourth ring segment, and the two ends of the third ring segment are respectively vertically connected to the other end of the second ring segment and the fourth ring segment. The middle of the first ring segment is vertically connected to the lower end of the first group of cable support rods A1101, the middle of the third ring segment is vertically connected to the lower end of the first group of cable support rods B1102, the middle of the second ring segment is vertically connected to the lower end of the second group of cable support rods A1201, and the middle of the fourth ring segment is vertically connected to the lower end of the second group of cable support rods B1202.

[0032] In this embodiment, there are four connecting rods 4, and there may also be five, six, etc., which can be added or reduced as needed. The lower ends of the four connecting rods 4 are respectively connected to the four corners of the annular component 1501.

[0033] The tower restraint component 1, the connecting rod 4 and the stabilizing platform 2 described in the present invention are all made of steel, and their rigidity can reduce the vortex-induced vibration of the wind turbine tower 5. The cable bracket and the bearing assembly 15 are welded, the cable support rod and the auxiliary rod 14 are welded, and the annular component 1501 and the reinforcement frame 1502 are welded. The rigidity of each component and connection of the present invention is improved, which improves the natural frequency of the present invention, avoids it from being close to the vortex emission frequency, and avoids resonance.

[0034] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A prestressed cable conversion structure for a wind power tower, characterized in that: include: A tower restraining component, wherein a sliding component is provided on the tower restraining component and the tower restraining component is fixed in the tower; A cable, wherein the middle portion of the cable spans across the tower restraining component and is slidably connected to the tower restraining component via the sliding component, both ends of the cable are connected to the ground, and the cable can be subjected to pre-tensioning stress.

2. A prestressed cable conversion structure for a wind power tower according to claim 1, characterized in that: The tower restraining component includes a cable bracket and a bearing assembly for bearing the cable bracket, the bearing assembly is connected to the tower, and the sliding component is arranged on the cable bracket.

3. A prestressed cable conversion structure for a wind power tower according to claim 2, characterized in that: The cable bracket includes multiple groups of cable support rods, the sliding component is arranged at the upper end of the cable support rods, a spacing S is left between the horizontal planes where the upper ends of the multiple groups of cable support rods are located, and the spacing S is greater than the diameter of the cable; the number of the cables is the same as the number of groups of the cable support rods, the multiple cables correspond one-to-one to the multiple groups of cable support rods, and the multiple cables are staggered.

4. A prestressed cable conversion structure for a wind power tower according to claim 3, characterized in that: The cable support rod comprises a cable support rod A and a cable support rod B. The lower ends of the cable support rod A and the cable support rod B are respectively vertically connected to the bearing assembly, and the sliding component is arranged at the upper ends. The cable support rod A and the cable support rod B are parallel to each other and have a distance between them.

5. A prestressed cable conversion structure for a wind power tower according to claim 4, characterized in that: The longitudinal planes where the cable supports of each group are located are all staggered.

6. A prestressed cable conversion structure for a wind power tower according to claim 5, characterized in that: The cable bracket also includes multiple auxiliary rods, and the cable support rod A and the cable support rod B each correspond to one auxiliary rod. The auxiliary rods are located on the opposite sides of the cable support rod A and the cable support rod B. The upper end of the auxiliary rod is connected to the middle part of the cable support rod, and the lower end is connected to the bearing assembly. The auxiliary rod is inclined relative to the cable support rod and the bearing assembly.

7. A prestressed cable conversion structure for a wind power tower according to claim 6, characterized in that: The cable support rods are divided into two groups, namely a first group of cable support rods and a second group of cable support rods. The first group of cable support rods are higher than the second group of cable support rods, and the longitudinal plane where the first group of cable support rods are located is perpendicular to the longitudinal plane of the second group of cable support rods.

8. The prestressed cable conversion structure for a wind power tower according to claim 6, characterized in that: The bearing assembly includes an annular component and a reinforcement frame, wherein the reinforcement frame is located inside the annular component and connected to its inner wall, the annular component is connected to the lower end of the cable support rod, and the reinforcement frame is connected to the lower end of the auxiliary rod; the annular component is connected to the tower.

9. A prestressed cable conversion structure for a wind power tower according to any one of claims 2 to 8, characterized in that: The bearing assembly is connected to the tower via a stabilizing platform, the cross section of the stabilizing platform is circular, and the side wall of the stabilizing platform is connected to the inner side wall of the wind power tower.

10. A prestressed cable conversion structure for a wind power tower according to claim 9, characterized in that: A plurality of connecting rods are provided at the lower end of the stabilizing platform. The lower ends of the connecting rods are connected to the bearing assembly, and the upper ends of the connecting rods are connected to the stabilizing platform.

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