A large-scale wind turbine stator varnishing and baking method and implementation device

Abstract

The present invention discloses a method and device for baking the stator of a large wind turbine generator, which adopts a method for vertical varnishing and heating of multiple flat and nested stators and an implementation device of an anti-collision buffer protection structure + an integral lifting platform, wherein the integral lifting platform can complete the transfer of multiple stators during vertical varnishing and heating at one time, reducing the transportation time, thereby reducing the loss of varnish after the stator is varnished, and improving the work efficiency of the operator. The anti-collision buffer protection structure adopts a protective plate made of a non-metallic material wrapped with a soft material + a fixed plate structure made of a metal material, so that when the stator is hoisted in and out of the nested stator, it collides with the protective plate with a certain elasticity, so as to protect the stator from damage and isolate the collision with other stators, so as to reserve a certain time margin for the operator to discover and stop such collision, thereby improving the product quality.

Description

Technical Field

[0001] The invention belongs to the technical field of motor manufacturing, and in particular relates to a method and an implementation device for varnish dipping and baking of a stator of a large wind turbine generator. Background Art

[0002] At present, the overall insulation treatment of large-scale wind turbine stators with windings is carried out by horizontal or vertical flat placement for varnishing and baking. Due to the large volume of wind turbine stators with windings (maximum diameter reaches 6-8m), the varnishing and baking of the single flat placement method requires a large space, not only the space utilization rate of the varnishing and baking equipment is low, but also the time required for lifting is long, resulting in the loss of varnish and ultimately affecting the insulation performance of the wind turbine stator; if the set method of varnishing and baking is adopted, the number of wind turbine stators with windings placed per unit area can be increased. During the set placement of stators of different sizes, when the smaller stator is hoisted into the large stator (the middle of the wind turbine stator with windings is hollow), the bottom of the small stator is prone to slight swing and collide with the large stator when the small stator falls down or is lifted out from the middle of the large stator, and this collision is likely to cause damage to the stator core or winding insulation; in addition, when the stator is placed in a vertical set for varnishing and baking, it takes a long time to lift the stators one by one from the varnishing equipment to the baking equipment and increases the number of sets. Summary of the invention

[0003] To solve the above problems, the present invention discloses a method and an implementation device for varnish dipping and baking of a large wind turbine stator, adds a circular ring-shaped integral lifting platform for fixing stators of different diameters for vertical assembly and overall lifting, and places an anti-collision buffer protection structure between the two stators to achieve soft isolation between the stators with windings of the wind turbine to prevent damage caused by collision during lifting, thereby increasing production efficiency and improving product quality.

[0004] To achieve the above object, the technical solution of the present invention is as follows:

[0005] A large-scale wind turbine stator varnish dipping and baking method comprises the following steps:

[0006] (1) Make an integral lifting platform;

[0007] (2) Lift the larger stator onto the integral lifting platform and secure it;

[0008] (3) installing n impact buffer protection structures on the larger stator in step (2) along the circumferential direction, with a certain distance between adjacent impact buffer protection structures;

[0009] (4) Hang the smaller stator into the center hole of the larger stator and fix it;

[0010] (5) Use an overhead crane to lift the two stators at once through the integral lifting platform to the heating equipment for drying. After drying, lift them into the varnishing equipment for varnishing. After varnishing, lift the two stators at once through the integral lifting platform to the heating equipment for baking to reduce the time of paint dripping, thereby reducing the loss of varnish in the stator slots. After the stator is heated and baked, repeat the second varnishing and heating baking.

[0011] (6) After the second heating and baking of the stator is completed, wait for the stator to cool to room temperature, remove the smaller stator from the overall lifting platform, and use the overhead crane to lift the smaller stator out of the larger stator and place it on the ground. Next, remove the n pieces of impact buffer protection structure on the larger stator, and lift the larger stator from the overall lifting platform to the ground. After cleaning and inspection, the two stators will flow into the subsequent process.

[0012] Furthermore, the integrated lifting platform described in the present invention is an annular structure, and is provided with a group of external mounting holes, a group of internal mounting holes and a plurality of through holes, and lifting ears are symmetrically provided on the circumference of the integrated lifting platform.

[0013] Furthermore, the stator with a larger size is fixed to the support base of the stator and the integral lifting platform through the external mounting holes on the integral lifting platform (fixed with bolts).

[0014] Furthermore, the stator with a smaller size is fixed to the stator support base and the integral lifting platform through the inner mounting hole on the integral lifting platform (fixed with bolts).

[0015] Furthermore, the anti-collision buffer protection structure includes a protective plate and a fixed plate, wherein the fixed plate is a folding plate protruding upward, and the fixed plate is fixed to the upper edge of the larger stator through the fixing hole below, and the protective plate is fixed to the upper end of the fixing plate by bolts, and the protective plate is vertically arranged, and there is a certain distance between the protective plate and the inner wall of the larger stator.

[0016] Furthermore, the fixing plate is formed by bending a metal material.

[0017] Furthermore, the protection plate is made of non-metallic material, and the length of the protection plate is less than the height of the larger stator.

[0018] Furthermore, the protective plate is arc-shaped.

[0019] Furthermore, a layer of soft material is provided on the surface of the protective plate.

[0020] Furthermore, the soft material is soft cloth or felt.

[0021] The beneficial effects of the present invention are:

[0022] The present invention provides a method for vertical varnish dipping and heating with multiple flat-laid and nested units and an implementation device of an anti-collision buffer protection structure + an integral lifting platform. The method for vertical varnish dipping and heating with multiple flat-laid and nested units solves the problems of low space utilization of varnish dipping and heating equipment and low stator varnish dipping heating efficiency.

[0023] The design of the integral lifting platform can realize the transfer of multiple stators at one time during vertical varnishing and heating, thus reducing the transportation time, thereby reducing the loss of varnish after stator varnishing, and improving the work efficiency of operators. In addition, the integral lifting platform adopts a ring structure with through holes on the surface, which can not only reduce the weight of the integral lifting platform, but also reduce the varnish it carries when the integral lifting platform is lifted out of the varnishing, thereby reducing the ineffective loss of varnish.

[0024] The anti-collision buffer protection structure adopts a protective plate made of non-metallic material wrapped with soft material + a fixed plate made of metal material. By adopting this protective structure, the problem of wind turbine stator being easily damaged by collision when the stator is placed in the casing is solved. This protective structure uses non-metallic material as the protective plate, and soft material is wrapped on the protective plate made of non-metallic material, so that when the stator is hung in and out of the casing and other stators swing, they collide with the protective plate with a certain elasticity, so as to protect the stator from damage and isolate the collision with other stators, so as to reserve a certain time margin for the operator to discover and stop such collision. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the integral lifting platform described in the present invention.

[0026] Figure 2 This is a schematic diagram of the installation of the two large and small stators described in the present invention.

[0027] Figure 3 This is a cross-sectional view of the installation of two stators of different sizes according to the present invention.

[0028] Figure 4 This is a schematic diagram of the anti-collision buffer protection structure of the present invention.

[0029] List of Figure Symbols:

[0030] 1. Overall lifting platform, 2. External mounting holes, 3. Internal mounting holes, 4. Through holes, 5. Lifting ears, 6. Larger stator, 7. Smaller stator, 8. Anti-collision buffer protection structure, 9. Fixed plate, 10. Protective plate, 11. Soft material, 12. Bolts. DETAILED DESCRIPTION

[0031] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0032] As shown in the figure, the present invention provides a vertical varnish dipping and heating method with multiple flat-laid and nested units and an implementation device of an anti-collision buffer protection structure + an integral lifting platform. The vertical varnish dipping and heating method with multiple flat-laid and nested units solves the problems of low space utilization of varnish dipping and heating equipment and low stator varnish dipping heating efficiency.

[0033] A large-scale wind turbine stator varnish dipping heating method and implementation device are as follows:

[0034] First, an integral lifting platform 1 of an annular structure is manufactured. The integral lifting platform 1 is provided with a group of external mounting holes 2, a group of internal mounting holes 3 and a plurality of through holes 4. Lifting ears 5 are symmetrically provided on the circumference of the integral lifting platform.

[0035] Lift the larger stator 6 onto the integral lifting platform 1, and fix the stator support seat to the integral lifting platform through the external mounting holes 2 on the integral lifting platform (fixed with bolts). Open a through hole 4 on the integral lifting platform so that when the integral lifting platform 1 is lifted out of the varnishing equipment, the varnish on it flows back to the varnishing equipment from the through hole, which can reduce the loss of varnish. Four lifting ears 5 are installed on the integral lifting platform 1 for overhead crane lifting.

[0036] Then, n anti-collision buffer protection structures 8 are installed on the larger stator 6 along the circumferential direction (symmetrical installation), and a certain distance is spaced between two adjacent anti-collision buffer protection structures 8. The number n is determined according to the diameter of the stator ( Figure 2 and Figure 3 n=4).

[0037] The anti-collision buffer protection structure 8 is composed of a protective plate 10 made of non-metallic material wrapped by a soft material + a fixing plate 9 made of metal material, such as Figure 4 As shown, the specific structure is as follows:

[0038] The protective plate 10 is made of non-metallic material, which plays a buffering role when the stator set swings; the protective plate 10 has a certain elasticity and strength; the protective plate 10 is arc-shaped, which is basically the same as the curvature of the stator outer wall. In addition, the length of the protective plate is less than the height of the larger stator. The protective plate can play a protective role when the length reaches 1 / 2-2 / 3 of the height of the larger stator;

[0039] The fixing plate 9 is made of bent metal material, and the fixing plate 9 is fixed to the upper edge of the larger stator through the fixing holes to fix the entire anti-collision buffer protection structure; the protective plate 10 is fixed to the upper end of the fixing plate 9 by bolts 12, and the protective plate is vertically arranged, and a certain distance is spaced between the protective plate and the inner wall of the larger stator to leave deformation space after collision;

[0040] The protective plate 10 is connected to the upper part of the fixed plate 9 by bolts. This connection method can make the components of the anti-collision buffer protection structure 8 replaceable, so that fixed plates and protective plates of different sizes can be used interchangeably, widening the applicable range of the size of the protective structure and reducing the number of protective structures equipped in the factory;

[0041] 4) After the protective plate 10 is connected to the fixed plate 9, a layer of soft material 11 (the soft material is felt, which can withstand high temperatures) is wrapped around the entire surface of the protective plate to increase the elasticity of the protective plate during collision, thereby increasing the buffering effect during collision.

[0042] Then, the smaller stator 7 is hoisted into the center hole of the larger stator 6, and the stator support base is fixed to the overall hoisting platform through the inner mounting hole 3 on the overall hoisting platform. The schematic diagram of the stator after assembly is shown in the attached figure. Figure 2 It is best to install the two stators concentrically so that they can be more stable during lifting.

[0043] Use an overhead crane to lift the two stators at once through the integral lifting platform 1 to the heating equipment for drying. After drying, lift them into the varnishing equipment for varnishing. After varnishing, lift the two stators at once through the integral lifting platform 1 to the heating equipment for baking to reduce the time of dripping paint, thereby reducing the loss of varnish in the stator slots. After the stator heating and baking is completed, repeat the second varnishing and heating baking.

[0044] After the second heating and baking of the stator is completed, wait for the stator to cool to room temperature, remove the fixing bolts of the support seat of the smaller stator, and lift the smaller stator out of the larger stator by the overhead crane and place it on the ground. Next, remove the n anti-collision buffer protection structures on the larger stator and the fixing bolts on the overall lifting platform, and lift the larger stator from the overall lifting platform to the ground. After cleaning and inspection, the two stators flow into the subsequent process.

[0045] The present invention provides a large-scale wind turbine stator varnish dipping heating method and implementation device,

[0046] 1) Improve the space utilization rate of varnishing equipment and heating equipment used for insulation treatment of stator with windings of large wind turbines, saving a lot of energy consumption and equipment investment;

[0047] 2) It can greatly improve the production efficiency of the varnish dipping and heating process of large wind turbine stators with windings;

[0048] 3) When multiple stators are laid flat or placed in a vertical dipping process, the use of an integral lifting platform can reduce the number of lifting times and effectively reduce the loss of dipping paint during vertical placement and dipping and baking;

[0049] 4) When the anti-collision buffer protection structure swings on the stator sets of wind turbines of different sizes, the operator has a certain amount of time to correct the error;

[0050] 5) The various components of the anti-collision buffer protection structure are interchangeable, reducing the number of spare parts for the factory protection structure;

[0051] 6) Compared with the overall isolation protective cover, the anti-collision buffer protection structure is flexible, lightweight, easy to operate, and can be used in various set scenarios.

[0052] It should be noted that the above content only illustrates the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. For ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made. For example, multiple stators can be installed at one time for varnish dipping and heating. In addition, a monitoring probe can be installed under the fixing plate. If the protective plate 10 is hit or broken, an alarm will be immediately triggered, thereby avoiding the trouble caused by visual blind spots. These improvements and modifications all fall within the protection scope of the claims of the present invention.

Claims

1. A large-scale wind turbine stator varnishing and baking method, characterized in that: The following steps are involved: (1) Make an integral lifting platform; (2) Lift the larger stator onto the integral lifting platform and secure it; (3) n anti-collision buffer protection structures are installed on the larger stator in step (2) along the circumferential direction, with a certain distance between adjacent collision buffer protection structures; The anti-collision buffer protection structure includes a protective plate and a fixed plate, wherein the fixed plate is a folded plate protruding upward, and the fixed plate is fixed to the upper edge of the larger stator through the fixing hole below, and the protective plate is fixed to the upper end of the fixed plate by bolts, and the protective plate is vertically arranged, and a certain distance is spaced between the protective plate and the inner wall of the larger stator; (4) Hang the smaller stator into the center hole of the larger stator and fix it; (5) Use an overhead crane to lift the two stators at once through the integral lifting platform to the heating equipment for drying. After drying, lift them into the varnishing equipment for varnishing. After varnishing, lift the two stators at once through the integral lifting platform to the heating equipment for baking. After the stator heating and baking, repeat the second varnishing and heating baking. (6) After the second heating and baking of the stator is completed, wait for the stator to cool to room temperature, remove the smaller stator from the overall lifting platform, and use the overhead crane to lift the smaller stator out of the larger stator and place it on the ground; then remove the n pieces of impact buffer protection structures on the larger stator, and lift the larger stator from the overall lifting platform to the ground. After the two stators are cleaned and inspected, they will flow into the subsequent processes.

2. A large-scale wind turbine stator varnishing and baking method according to claim 1, characterized in that: The following steps are involved: The integral lifting platform is an annular structure, and is provided with a group of external mounting holes, a group of internal mounting holes and a plurality of through holes, and lifting ears are symmetrically provided on the circumference of the integral lifting platform.

3. A large-scale wind turbine stator varnishing and baking method according to claim 2, characterized in that: The stator with a larger size is fixed to the stator support base and the integral lifting platform through the external mounting hole on the integral lifting platform.

4. A large-scale wind turbine stator varnishing and baking method according to claim 2, characterized in that: The stator with a smaller size is fixed to the stator support base and the integral lifting platform through the inner mounting hole on the integral lifting platform.

5. A large-scale wind turbine stator varnishing and baking method according to claim 1, characterized in that: The fixing plate is formed by bending a metal material.

6. A large-scale wind turbine stator varnishing and baking method according to claim 1, characterized in that: The protective plate is made of non-metallic material, and the length of the protective plate is less than the height of the larger stator.

7. A large-scale wind turbine stator varnishing and baking method according to claim 6, characterized in that: The protective plate is arc-shaped.

8. A large-scale wind turbine stator varnishing and baking method according to claim 6, characterized in that: A layer of soft material is provided on the surface of the protection plate.

9. A large-scale wind turbine stator varnishing and baking method according to claim 8, characterized in that: The soft material is soft cloth or felt.

Images