Hoisting fixture for wind turbine tower sections

Abstract

The utility model provides a kind of hoisting fixture for wind power tower drum. The hoisting fixture for wind power tower drum includes bottom plate, end connecting plate, lifting lug, side connecting plate and locking bolt, one side of the bottom plate is provided with two pieces of the end connecting plate in parallel, the other side is provided with one or more locking bolts through to the between two pieces of the end connecting plate, and is engaged with the bottom plate thread, the side connecting plate is movably arranged between two pieces of the end connecting plate, and is abutted with all the locking bolts, the lifting lug is arranged on the outer side of the bottom plate or the end connecting plate, and the end connecting plate is provided with a plurality of connecting holes. The hoisting fixture for wind power tower drum provided by the utility model solves the defects of excessive stress or insufficient strength of the existing tower drum hoisting fixture.

Description

Technical Field

[0001] This utility model relates to the field of wind power generation, specifically to a hoisting clamp for wind turbine towers. Background Technology

[0002] The tower in a wind power system primarily supports the top nacelle and blades, while also absorbing vibrations generated during wind turbine operation. The tower is typically constructed from multiple sections assembled sequentially, requiring lifting equipment to suspend and install them. Current lifting methods involve installing lifting clamps on the flanges at both ends of the tower section, connecting slings to the clamps, and using two cranes to rotate the tower from horizontal to vertical before installation. The basic structure of existing clamps consists of lifting lugs in the middle of a steel plate and connection holes at both ends for connecting flanges. The drawback of this type of clamp is that the lifting lugs occupy space in the steel plate, resulting in fewer connection holes, higher stress, and potential damage to the tower flanges. Increasing the number of connection holes by lengthening or widening the steel plate necessitates thickening the clamp, leading to excessive weight and installation difficulties. To address these issues, patent CN223087439U discloses a clamp with lifting lugs on the outer side and a multi-section chain arm connecting both sides of the flange. Moving the lifting lugs outwards provides sufficient space for the connection holes, and the connection on both sides also distributes the force, allowing the weight of the clamp to be controlled within a suitable range. However, in this design, the chain arms rely on pins for stress, resulting in insufficient strength. Furthermore, the lifting lugs are located far from the tower flange, making them prone to bending or damage during longitudinal lifting. Utility Model Content

[0003] To address the shortcomings of existing tower hoisting clamps, such as excessive stress or insufficient strength, this utility model provides a hoisting clamp for wind turbine towers that solves the above problems.

[0004] A hoisting clamp for wind turbine towers includes a base plate, end connecting plates, lifting lugs, side connecting plates, and locking bolts. Two end connecting plates are arranged parallel to each other on one side of the base plate, and one or more locking bolts are provided on the other side, penetrating between the two end connecting plates and threadedly engaging with the base plate. The side connecting plates are movably disposed between the two end connecting plates and abut against all the locking bolts. The lifting lugs are provided on the outer side of the base plate or the end connecting plates, and the end connecting plates are provided with multiple connecting holes.

[0005] In a preferred embodiment of the hoisting clamp for wind turbine towers provided by this utility model, the base plate is a square flat plate, on one side of which two end connecting plates are welded parallel to the two long sides, and on the other side, one or more locking bolts are provided in the middle along the length direction. The end connecting plates are square flat plates, perpendicular to the base plate, and have three or more connecting holes at positions that can be aligned with the mounting holes of the tower flange.

[0006] In a preferred embodiment of the hoisting clamp for wind turbine towers provided by this utility model, the side connecting plate is a long strip-shaped flat plate. One side is a flat surface that abuts against the locking bolt, and the other side is an arc shape that can fit against the edge of the tower flange. Both ends are aligned with the ends of the base plate and the end connecting plate, and both sides are movably connected to the end connecting plate.

[0007] In a preferred embodiment of the hoisting clamp for wind turbine towers provided by this utility model, the side connecting plate has multiple protruding strips on both sides in a direction perpendicular to the base plate, and the end connecting plate has multiple grooves on its adjacent sides that connect with the protruding strips. The end connecting plate has a plug at the end of the groove furthest from the base plate.

[0008] In a preferred embodiment of the hoisting clamp for wind turbine towers provided by this utility model, the side connecting plate has multiple recesses on its flat side that abut against the locking bolts, and the end of the locking bolts has a limiting seat that abuts against the recesses of the side connecting plate.

[0009] Compared with existing technologies, the hoisting clamp for wind turbine towers provided by this utility model has the following advantages: 1. The solution provided by this utility model adopts a design that moves the lifting lugs outward and clamps and fixes them from both sides of the tower flange. It has enough space to set the connection holes, disperses the force, and makes the clamp achieve a good balance between strength and weight, making it easy to use.

[0010] 2. The solution provided by this utility model adds a side connecting plate, which further tightens the edge of the tower flange, so that the clamps fix the tower flange from three directions and further disperse the force, making the connection more stable and avoiding damage to the tower flange.

[0011] 3. The solution provided by this utility model allows for flexible selection of the lifting lug location. The solution with the lugs on the base plate is suitable for horizontal lifting such as loading, while the solution with the lugs on the end connecting plate is suitable for vertical lifting such as installation, making it convenient to use. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the hoisting clamp used for wind turbine towers in Example 1; Figure 2 This is a structural diagram of the connecting plate at the middle end of the hoisting clamp used for wind turbine towers; Figure 3 This is a structural schematic diagram of the side connecting plate in the hoisting clamp used for wind turbine towers; Figure 4 This is a schematic diagram of the hoisting clamp used for wind turbine towers in Example 2; Figure 5 This is a schematic diagram of the hoisting clamp used for wind turbine towers in Example 3.

[0013] The following are labeled in the diagram: base plate 1, end connecting plate 2, connecting hole 21, groove 22, plug 23, lifting lug 3, side connecting plate 4, pit 41, protrusion 42, locking bolt 5, limit seat 51. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Example 1:

[0015] Please also refer to Figures 1 to 3 These are schematic diagrams of the hoisting clamps used for wind turbine towers, and schematic diagrams of the middle connecting plate 2 and the side connecting plate 3.

[0016] The hoisting fixtures used for wind turbine towers include a base plate 1, an end connecting plate 2, lifting lugs 3, side connecting plates 4, and locking bolts 5.

[0017] The base plate 1 is a square flat plate. As shown in the figure, two end connecting plates 2 are welded parallel to the two long sides on the lower surface. Four bolt holes are provided in the middle of the upper surface along the length direction, and locking bolts 5 are screwed into them. A lifting lug 3 is welded at the very center of the upper surface.

[0018] The end connecting plate 2 is a square flat plate, perpendicular to the base plate 1, and has three connecting holes 21 at positions that can be aligned with the mounting holes of the tower flange. On the inner side of the end connecting plate 2, near the left and right sides, there is a groove 22 along its width, and a plug 23 is provided in the lower half of the groove 22. The surface of the plug 23 is flush with the inner side of the end connecting plate 2. Since the groove 22 passes through the connecting holes 21, the plug 23 also has a corresponding opening.

[0019] The side connecting plate 4 is a long, flat plate. Its lower surface, as shown in the diagram, is an arc shape that fits against the edge of the tower flange, while its upper surface is flat and has four recesses 41. These recesses 41 are used to abut against the locking bolts 5 to prevent slippage. Near the left and right sides, the outer surface of the side connecting plate 4 has a raised strip 42 along its width, which connects to the groove 22. This allows the side connecting plate 4 to slide along the groove 22 between the base plate 1 and the plug 23.

[0020] The lower end of the locking bolt 5 is provided with a limiting seat 51. The limiting seat 51 has a bowl-shaped structure. The lower end of the locking bolt 5 is inserted into and fixed to the limiting seat 51. The limiting seat 51 abuts against the recess 41 to reduce friction. The limiting seat 51 has a structure of two halves joined together. The two halves of the limiting seat 51 are connected by screws that pass through both halves of the limiting seat 51 and the locking bolt 5, so that the whole remains relatively fixed.

[0021] In use, first insert the lower opening of the clamp into the side of the tower flange, then install the fixing bolts in the connection hole 21 to initially fix the clamp to the tower flange. Then tighten all the locking bolts 5 to make the side connecting plate 4 abut against the edge of the tower flange. Finally, tighten all the fixing bolts in the connection hole 21, and you are ready to start the hoisting operation. Example 2:

[0022] Please also refer to Figure 4 This is a structural diagram of a hoisting clamp used for wind turbine towers.

[0023] The hoisting fixtures used for wind turbine towers include a base plate 1, an end connecting plate 2, lifting lugs 3, side connecting plates 4, and locking bolts 5.

[0024] The base plate 1 is a square flat plate. As shown in the figure, two end connecting plates 2 are welded parallel to the two long sides on the lower surface. Four bolt holes are provided in the middle of the upper surface along the length direction, and locking bolts 5 are screwed into them. No lifting lugs 3 are provided on the upper surface.

[0025] The end connecting plate 2 is a square flat plate, perpendicular to the base plate 1, and has three connecting holes 21 at a position that can be aligned with the mounting holes of the tower flange. The inner surface structure of the end connecting plate 2 is the same as in Embodiment 1. On the outer surface of the end connecting plate 2, a lifting lug 3 is welded in the middle of the area overlapping with the base plate 1. Two lifting lugs 3 are symmetrically provided on both sides at the same position. The structure of the side connecting plate 4 and the locking bolts 5 is the same as in Embodiment 1, and will not be described again here.

[0026] With the above structure, the lifting lug 3 is positioned closer to the tower flange, which shortens the lever arm during lifting, making the overall stress more stable and preventing component deformation. Example 3:

[0027] Please also refer to Figure 4 This is a structural diagram of a hoisting clamp used for wind turbine towers.

[0028] The hoisting fixture for wind turbine towers includes a base plate 1, an end connecting plate 2, lifting lugs 3, a side connecting plate 4, and locking bolts 5. It is longer overall than that of Embodiment 2.

[0029] The base plate 1 is a square flat plate. As shown in the figure, two end connecting plates 2 are welded parallel to the two long sides on the lower surface. Six bolt holes are provided in the middle of the upper surface along the length direction, and locking bolts 5 are screwed into them. No lifting lugs 3 are provided on the upper surface.

[0030] The end connecting plate 2 is a square flat plate, perpendicular to the base plate 1, and has five connecting holes 21 at a position that can be aligned with the mounting holes of the tower flange. The structure of the side connecting plate 4 and the locking bolts 5 is the same as in Embodiment 1, and will not be described again here.

[0031] With the above structure, more connection holes 21 are provided to connect with the tower flange, which disperses the stress and avoids damage to the tower flange.

[0032] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A hoisting clamp for wind turbine towers, characterized in that: The device includes a base plate, end connecting plates, lifting lugs, side connecting plates, and locking bolts. Two end connecting plates are arranged parallel to each other on one side of the base plate, and one or more locking bolts are arranged on the other side, penetrating between the two end connecting plates and threadedly engaging with the base plate. The side connecting plates are movably disposed between the two end connecting plates and abut against all the locking bolts. The lifting lugs are disposed on the outer side of the base plate or the end connecting plates, and the end connecting plates are provided with multiple connecting holes.

2. The hoisting clamp for wind turbine towers according to claim 1, characterized in that: The base plate is a square flat plate, with two end connecting plates welded parallel to the two long sides on one side, and one or more locking bolts provided in the middle of the other side along the length direction.

3. The hoisting clamp for wind turbine towers according to claim 2, characterized in that: The end connecting plate is a square flat plate, perpendicular to the base plate, and has three or more connecting holes at a position that can be aligned with the mounting holes of the tower flange.

4. The hoisting clamp for wind turbine towers according to claim 3, characterized in that: The side connecting plate is a long strip-shaped flat plate, with one side being a flat surface that abuts against the locking bolt, and the other side being an arc shape that can fit against the edge of the tower flange. Both ends are aligned with the ends of the base plate and the end connecting plate, and both sides are movably connected to the end connecting plate.

5. The hoisting clamp for wind turbine towers according to claim 4, characterized in that: On both sides of the side connecting plate, there are multiple protruding strips in a direction perpendicular to the bottom plate, and on the side of the end connecting plate, there are multiple grooves that connect with the protruding strips.

6. The hoisting clamp for wind turbine towers according to claim 5, characterized in that: The end connecting plate has a plug at the end of the groove away from the bottom plate.

7. The hoisting clamp for wind turbine towers according to claim 4, characterized in that: The side connecting plate has multiple recesses on its flat side that abut against the locking bolt, and the end of the locking bolt has a limiting seat that abuts against the recesses of the side connecting plate.

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