Laminating device for stator core of large-scale wind driven generator

Abstract

The utility model belongs to the technical field of large-scale wind driven generator stator core lamination, and particularly relates to a large-scale wind driven generator stator core lamination device which comprises a stator supporting seat, a lower pressing plate is arranged at the top of the stator supporting seat, an upper pressing plate is arranged at the top of the lower pressing plate, and the upper pressing plate is arranged at the bottom of the stator supporting seat. A stator core is arranged between the lower pressing plate and the upper pressing plate. According to the utility model, the eight mechanical jacks are uniformly arranged, then the lower pressing plate of the large-scale pre-pressing tool is hung on the jacks, each jack is adjusted, then the stator iron cores are stacked on the lower pressing plate, when the stator iron cores are stacked to a fixed height, the groove type of the stator iron cores is adjusted, then the upper pressing plate of the large-scale pre-pressing tool is hung, and after the hanging is completed, the stator iron cores are placed on the lower pressing plate. The two ends of the inner ring screw rod and the two ends of the outer ring screw rod penetrate through the lower pressing plate and the upper pressing plate to be connected with the nuts, and therefore the problem that tiny inter-piece gaps are possibly generated after scattered pieces are installed can be solved through the structure, and the iron core length requirement and the iron core overlying coefficient are guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of stator core stacking technology for large wind turbine generators, specifically relating to a stator core stacking device for large wind turbine generators. Background Technology

[0002] The stator core is made by stamping silicon steel sheets (such as 0.5mm thick 50W470 cold-rolled silicon steel sheets) into fan-shaped plates and stacking them on positioning ribs. The positioning ribs are welded to the frame ring plate via support plates, and the core is pressed together as a whole by upper and lower toothed pressure plates and tension bolts. It is usually composed of fan-shaped plates, ventilation slots, positioning ribs, upper and lower toothed pressure plates, tension bolts, and support plates. In addition, the stator core is also the part that houses the windings, and the stator core of large wind turbines needs to be stacked during the production process.

[0003] Currently, the existing large wind turbine stator cores are typically stacked using a novel positioning method, added tooling, and unique limiting mechanism from the "Design of Mobile Stator Core Stacking Mold" to ensure correct positioning of the stator laminations and smooth demolding. However, this design is not suitable for stacking large generator stator cores. When applied to the stacking of large generator stator cores, it cannot guarantee the lamination clamping amount, resulting in unqualified core stacking coefficients. Utility Model Content

[0004] The purpose of this utility model is to provide a device for stacking stator cores of large wind turbines. It aims to solve the problem that existing technologies for stacking stator cores of large wind turbines typically employ a novel positioning method, added tooling, and unique limiting mechanism as described in the "Design of Mobile Stator Core Stacking Mold" to ensure correct positioning of stator laminations and smooth demolding. However, this design is not suitable for stacking stator cores of large turbines. When used in the stacking process of large turbine stator cores, it cannot guarantee the amount of lamination clamping, resulting in an unqualified core stacking coefficient.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a stator core stacking device for large wind turbine generators, comprising a stator support base, a lower pressure plate provided on the top of the stator support base, an upper pressure plate provided on the top of the lower pressure plate, and a stator core disposed between the lower pressure plate and the upper pressure plate.

[0006] The bottom of the lower pressure plate has eight jacks arranged in a ring, and the outer ring of the stator core has multiple outer ring screws arranged in a ring. One end of each outer ring screw passes through the lower pressure plate and is connected to the lower outer ring nut. The other end of each outer ring screw passes through the upper pressure plate and is connected to the upper outer ring nut. A stator support is provided on the inner side of the stator core.

[0007] As a preferred embodiment of the present invention for the stator core stacking device of a large wind turbine generator, the plurality of outer ring screws are distributed in a ring with equal spacing.

[0008] As a preferred embodiment of the present invention for the stator core stacking device of a large wind turbine generator, the stator core has a plurality of inner ring screws distributed in an annular pattern on its inner ring. One end of each of the inner ring screws passes through the lower pressure plate and is connected to the lower nut of the inner ring, and the other end of each inner ring screw passes through the upper pressure plate and is connected to the upper nut of the inner ring.

[0009] As a preferred embodiment of the present invention for the stator core stacking device of a large wind turbine generator, the plurality of inner ring screws are distributed in a ring with equal spacing.

[0010] As a preferred embodiment of the present invention for the stator core stacking device of a large wind turbine generator, the stator core is located between the outer ring screw and the inner ring screw.

[0011] As a preferred embodiment of the present invention for the stator core stacking device of a large wind turbine generator, the top of the lower pressure plate has four positioning seats arranged in a ring, and the top of the four positioning seats is provided with positioning grooves. The bottom of the upper pressure plate has four positioning blocks arranged in a ring.

[0012] As a preferred embodiment of this utility model for the stator core stacking device of a large wind turbine generator, the four positioning blocks are arc-shaped, and the positioning grooves are adapted to the dimensions of one end of the positioning blocks.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] By evenly placing eight mechanical jacks, then suspending the lower pressure plate of the large pre-compression fixture on the jacks and adjusting each jack, the stator core of the large wind turbine is stacked on the lower pressure plate. After stacking to a fixed height, the stator core slot shape is adjusted, and then the upper pressure plate of the large pre-compression fixture is suspended. After suspension, the two ends of the inner ring screw are first passed through the lower and upper pressure plates, and then connected and tightened to the lower and upper nuts of the inner ring respectively. Then the two ends of the outer ring screw are passed through the lower and upper pressure plates, and then connected and tightened to the lower and upper nuts of the outer ring respectively. Thus, the above structure can solve the problem of small gaps between the loose pieces that may occur after the installation is completed, and ensure the core length requirement and the core stacking coefficient.

[0015] With equally spaced, circularly distributed positioning seats, positioning slots, and positioning blocks, when the upper pressure plate is suspended on top of the lower pressure plate, the positioning blocks at the bottom of the upper pressure plate are respectively embedded into the positioning slots at the top of the positioning seats, thereby achieving a positioning function and enabling the empty spaces on the lower and upper pressure plates to quickly align, so that the outer and inner ring screws can pass through. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the main disassembly structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the structure of this utility model from below;

[0020] Figure 4 This is a schematic diagram of the disassembled structure of this utility model from a bottom view.

[0021] In the diagram: 1. Stator support base; 2. Lower pressure plate; 3. Upper pressure plate; 4. Stator core; 5. Jack; 6. Outer ring screw; 7. Lower outer ring nut; 8. Upper outer ring nut; 9. Stator bracket; 10. Inner ring screw; 11. Lower inner ring nut; 12. Upper inner ring nut; 13. Positioning seat; 14. Positioning groove; 15. Positioning block. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figures 1-4 The present invention provides the following technical solution: a stator core stacking device for large wind turbine generators, including a stator support 1, a lower pressure plate 2 is provided on the top of the stator support 1, an upper pressure plate 3 is provided on the top of the lower pressure plate 2, and a stator core 4 is provided between the lower pressure plate 2 and the upper pressure plate 3.

[0024] The bottom of the lower pressure plate 2 is provided with eight jacks 5 arranged in a ring. The outer ring of the stator core 4 is provided with multiple outer ring screws 6. One end of the multiple outer ring screws 6 passes through the lower pressure plate 2 and is connected to the lower outer ring nut 7. One end of the outer ring screws 6 passes through the upper pressure plate 3 and is connected to the upper outer ring nut 8. The inner side of the stator core 4 is provided with a stator bracket 9.

[0025] It should be noted that a square hole is provided at the top of the upper pressure plate 3.

[0026] Preferably, the multiple outer ring screws 6 are arranged in an equally spaced ring, and the stator core 4 has multiple inner ring screws 10 arranged in an annular pattern. One end of the multiple inner ring screws 10 passes through the lower pressure plate 2 and is connected to the lower inner ring nut 11. One end of the inner ring screws 10 passes through the upper pressure plate 3 and is connected to the upper inner ring nut 12. The multiple inner ring screws 10 are arranged in an equally spaced ring, and the stator core 4 is located between the outer ring screws 6 and the inner ring screws 10.

[0027] In practical use, eight mechanical jacks 5 are evenly placed, and then the large pre-compression fixture lower pressure plate 2 is hoisted onto the jacks 5. Each jack 5 is adjusted, and then the stator core 4 of the large wind turbine is stacked on the lower pressure plate 2. After stacking to a fixed height, the slot shape of the stator core 4 is adjusted, and then the large pre-compression fixture upper pressure plate 3 is hoisted. After hoisting, the two ends of the inner ring screw 10 are first passed through the lower pressure plate 2 and the upper pressure plate 3, and then connected to the inner ring lower nut 11 and the inner ring upper nut 12 respectively and tightened. Then the two ends of the outer ring screw 6 are passed through the lower pressure plate 2 and the upper pressure plate 3, and then connected to the outer ring lower nut 7 and the outer ring upper nut 8 respectively and tightened. Thus, the above structure can solve the problem of small gaps between the pieces that may occur after the loose pieces are installed, and ensure the core length requirement and the core stacking coefficient.

[0028] It is important to note that when adjusting each jack 5, each jack 5 must contact the lower surface of the lower plate, and the platform level must be ≤0.2mm. The tightening sequence of the nuts is as follows: first, tighten the inner ring lower nut 11 and inner ring upper nut 12 radially symmetrically, then tighten the outer ring lower nut 7 and outer ring upper nut 8 radially symmetrically. After that, tighten the inner and outer ring nuts simultaneously and symmetrically for one turn, using a fixed torque, and tighten the nuts with a torque wrench.

[0029] It is also important to note that by using a fixed torque and holding time, the tightness between the loose pieces can be ensured. At the same time, by opening a square hole at the top of the upper pressure plate 3, the stator slot pattern can be preserved to prevent the stator core 4 from deforming after the bracket is pressed in.

[0030] Preferably, the top of the lower pressure plate 2 has four positioning seats 13 arranged in a ring, and the top of the four positioning seats 13 is provided with positioning grooves 14. The bottom of the upper pressure plate 3 has four positioning blocks 15 arranged in a ring. The four positioning blocks 15 are arc-shaped, and the dimensions of the positioning grooves 14 and one end of the positioning blocks 15 are matched.

[0031] In practical use, the positioning seats 13, positioning grooves 14, and positioning blocks 15 are distributed in an equal-spaced ring. When the upper pressure plate 3 is suspended on top of the lower pressure plate 2, the positioning blocks 15 at the bottom of the upper pressure plate 3 are respectively embedded into the positioning grooves 14 at the top of the positioning seats 13, thereby achieving a positioning function and enabling the empty spaces on the lower pressure plate 2 and the upper pressure plate 3 to quickly correspond, so that the outer ring screw 6 and the inner ring screw 10 can pass through.

[0032] Working principle: First, place eight mechanical jacks 5 evenly. Then, hoist the lower pressure plate 2 of the large preloading fixture onto the jacks 5 and adjust each jack 5. During adjustment, each jack 5 must contact the lower surface of the lower plate, and the platform level should be ≤0.2mm. Next, stack the stator core 4 of the large wind turbine on the lower pressure plate 2. After stacking to a fixed height, adjust the channel shape of the stator core 4, and then hoist the upper pressure plate 3 of the large preloading fixture. After hoisting, first pass both ends of the inner ring screw 10 through the lower pressure plate 2 and the upper pressure plate 3, and then connect and tighten them to the inner ring lower nut 11 and the inner ring upper nut 12 respectively. Then pass both ends of the outer ring screw 6 through the lower pressure plate 2 and the upper pressure plate 3, and then connect and tighten them to the outer ring lower nut 7 and the outer ring upper nut 8 respectively. The tightening sequence of the nuts is as follows: first tighten the inner ring lower nut 11 and the inner ring upper nut 12 radially symmetrically, and then tighten the outer ring lower nut 7 and the outer ring upper nut 8 radially symmetrically. Then, the inner and outer ring nuts are simultaneously and symmetrically tightened with a fixed torque. This structure solves the problem of small gaps between the loose pieces that may occur after the installation of the loose pieces, and ensures the core length requirement and the core stacking coefficient. Furthermore, through the equally spaced annularly distributed positioning seats 13, positioning grooves 14, and positioning blocks 15, when the upper pressure plate 3 is suspended on top of the lower pressure plate 2, the positioning blocks 15 at the bottom of the upper pressure plate 3 are respectively embedded into the positioning grooves 14 at the top of the positioning seats 13, thereby achieving a positioning function. This allows the empty spaces on the lower pressure plate 2 and the upper pressure plate 3 to quickly correspond, so that the outer ring screw 6 and the inner ring screw 10 can pass through.

[0033] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for stacking stator cores of large wind turbine generators, comprising a stator support (1), characterized in that: The stator support base (1) is provided with a lower pressure plate (2) at the top, and an upper pressure plate (3) is provided at the top of the lower pressure plate (2). A stator core (4) is provided between the lower pressure plate (2) and the upper pressure plate (3). The bottom of the lower pressure plate (2) is provided with eight jacks (5) arranged in a ring. The outer ring of the stator core (4) is provided with multiple outer ring screws (6). One end of each of the multiple outer ring screws (6) passes through the lower pressure plate (2) and is connected to an outer ring lower nut (7). One end of each of the outer ring screws (6) passes through the upper pressure plate (3) and is connected to an outer ring upper nut (8). The inner side of the stator core (4) is provided with a stator bracket (9). The inner ring of the stator core (4) is provided with multiple inner ring screws (10). One end of each of the multiple inner ring screws (10) passes through the lower pressure plate (2) and is connected to an inner ring lower nut (11). One end of the inner ring screw (10) passes through the upper pressure plate (3) and is connected to the inner ring upper nut (12). The multiple inner ring screws (10) are distributed in a ring at equal intervals. The stator core (4) is located between the outer ring screw (6) and the inner ring screw (10). The top of the lower pressure plate (2) is provided with four positioning seats (13) in a ring. The top of the four positioning seats (13) is provided with positioning grooves (14). The bottom of the upper pressure plate (3) is provided with four positioning blocks (15) in a ring. The four positioning blocks (15) are arc-shaped, and the size of the positioning groove (14) is adapted to the size of one end of the positioning block (15).

2. The stator core stacking device for large wind turbine generators according to claim 1, characterized in that: The multiple outer ring screws (6) are distributed in a ring with equal spacing.

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