Wind power hub random molding sand box
By optimizing the structure of the wind turbine hub sand box to a hexagonal structure, the amount of sand consumed is reduced, which solves the problem of high cost in the traditional sand box manufacturing of wind turbine hubs and improves production efficiency.
Patent Information
- Application Number
- CN202520120076.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-01-20
AI Technical Summary
Traditional sandboxes consume a large amount of sand when manufacturing wind turbine hubs, resulting in low production efficiency and high costs.
The upper and lower sand boxes adopt a hexagonal structure with alternating vertical and sloping sidewalls. The size of the bottom of the upper sand box and the top of the lower sand box is reduced to decrease the amount of sand consumed, while retaining the functions of hoisting, turning and ventilation.
While maintaining the same parting surface sand box outline dimensions, production costs were reduced and production efficiency was improved.
Smart Images
Figure CN223762098U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of casting technology, specifically relating to a conformal sand box for wind turbine hubs. Background Technology
[0002] Sand boxes are one of the commonly used process equipment in casting production. Traditional sand boxes are all regular quadrilateral structures with parallel top and bottom surfaces. Large-megawatt turbine hubs are a common type of wind turbine casting. The three pitch surfaces are angled, and the casting is spherical with a large overall dimension, typically approximately φ4000mm × 4000mm in length. During process design, to ensure the casting's internal quality and maneuverability, it is often placed upright. During wind turbine hub casting production, because the hub is spherical, its maximum dimension is located at the parting line, i.e., the interface between the upper and lower sand molds. From the parting line, the casting's outline gradually decreases in both upward and downward directions. This results in the smallest sand intake at the parting line, gradually increasing in both upward and downward directions until the sand intake reaches its maximum at the top and bottom of the mold, typically reaching 1.5-2.0mm. According to casting manuals, a sand intake of 200-500mm is generally sufficient for the production of large castings. The excessively large sand intake severely restricts production efficiency and costs. Therefore, improvements are necessary to address these issues. Utility Model Content
[0003] The technical problem solved by this utility model is to provide a conformal sand box for wind turbine hubs. By optimizing the sand mold structure, the conformal sand box is composed of an upper sand box and a lower sand box with alternating hexagonal structures of three vertical side walls and three oblique side walls. While ensuring that the outline dimensions of the sand box on the parting surface remain unchanged, the size of the bottom of the upper sand box and the top of the lower sand box are reduced, and the sand intake is reduced. This solves the problem of high production cost caused by the large sand intake when using traditional sand boxes to manufacture wind turbine hubs. While retaining the original functions of sand box hoisting, flipping, ventilation and high strength, the production cost is greatly reduced and the production efficiency is improved.
[0004] The technical solution adopted in this utility model is: a wind turbine hub conformal sand box, including an upper sand box and a lower sand box with the same structure, one end sealed and the other end open. The side walls of the upper sand box and the lower sand box are hexagonal structures formed by three vertical side walls and three oblique side walls alternately distributed. The dimensions of the upper sand box and the lower sand box gradually decrease from the open end to the sealed end. The parting surface at the upper port of the lower sand box and the parting surface at the lower port of the upper sand box are provided with positioning holes and locking holes for detachable connection by means of pins and bolts.
[0005] The three vertical sidewalls of the upper and lower sand boxes correspond to the positions of the three pitch surfaces of the wind turbine hub mold that is placed upright in the molded sand box after forming.
[0006] Furthermore, the three vertical sidewalls of the upper and lower sand boxes are all isosceles trapezoids with an upper edge length greater than the lower edge length.
[0007] Furthermore, the upper and lower sand boxes are provided with lifting lugs on their outer walls for easy lifting, and inclined sand hanging strips are laid inside the upper and lower sand boxes.
[0008] Furthermore, the inclination of the three inclined sidewalls of the upper and lower sand boxes is 15°.
[0009] Furthermore, the sand intake of the wind turbine hub mold in the upper and lower sand boxes is 500mm.
[0010] Advantages of this utility model compared to the prior art:
[0011] 1. Based on the structural characteristics of wind turbine hubs, this technical solution optimizes the sand mold structure by using an upper sand box and a lower sand box with a hexagonal structure formed by alternating distribution of three vertical sidewalls and three oblique sidewalls. This conformal sand box reduces the size of the bottom of the upper sand box and the top of the lower sand box while keeping the outline size of the sand box on the parting surface unchanged, thus reducing the amount of sand consumed. This solves the problem of high manufacturing cost caused by large amount of sand consumed when using traditional sand boxes to manufacture wind turbine hubs.
[0012] 2. This technical solution has a simple structure and reasonable design. While retaining the original sand box's functions of hoisting, turning, ventilation, and high strength, the sloping sidewalls facilitate demolding, improve demolding efficiency, and greatly reduce production costs and increase production efficiency. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the internal structure of the present invention during use;
[0014] Figure 2 This is a three-dimensional structural diagram of the wind turbine hub casting mold located inside the lower sand box of this utility model. Detailed Implementation
[0015] The following will be based on the embodiments of this utility model. Figure 1-2 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0016] It should be noted that, unless otherwise stated herein, the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0017] In this document, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0018] Wind turbine hub conformal sand box, such as Figure 1-2 As shown, there are upper sand box 1 and lower sand box 2 with identical structures, one end sealed and the other open. The side walls of both upper sand box 1 and lower sand box 2 are hexagonal structures formed by alternating distribution of three vertical side walls and three inclined side walls. The dimensions of upper sand box 1 and lower sand box 2 gradually decrease from the open end to the sealed end. The inclination angle of the three inclined side walls on upper sand box 1 and lower sand box 2 is 15°. The inclined side walls facilitate demolding and reduce sand intake; this can be adjusted according to the sand intake during actual design. The parting surface at the upper port of lower sand box 2 and the parting surface at the lower port of upper sand box 1 are both provided with pins and... The positioning hole 3 and the locking box hole are detachably connected as one piece. The sand intake of the wind turbine hub casting mold 4 in the upper sand box 1 and the lower sand box 2 is 500mm. In the above structure, according to the structural characteristics of the wind turbine hub itself, the sand mold structure is optimized. The upper sand box 1 and the lower sand box 2 are composed of a hexagonal structure with three vertical side walls and three oblique side walls. Under the premise of ensuring that the outline size of the sand box on the parting surface remains unchanged, the size of the bottom of the upper sand box 1 and the top of the lower sand box 2 is reduced, the sand intake is reduced, and the problem of high production cost caused by large sand intake when the traditional sand box is used to prepare wind turbine hubs is solved.
[0019] The three vertical sidewalls of the upper sand box 1 and the lower sand box 2 correspond to the positions of the three pitch surfaces 8 of the wind turbine hub mold 4, which are placed upright in the molded sand box after molding. Specifically, the three vertical sidewalls of the upper sand box 1 and the lower sand box 2 are all isosceles trapezoids with an upper edge length greater than the lower edge length.
[0020] The upper sand box 1 and the lower sand box 2 are provided with lifting lugs 7 on their outer walls for easy lifting, and inclined sand hanging strips 6 are laid inside the upper sand box 1 and the lower sand box 2.
[0021] This design incorporates the basic structure of a traditional sand box, including vent holes, box reinforcement, box bands, sand hanging strips 6, lifting lugs 7, sand box positioning holes, and lock holes. It does not alter the original function and purpose of the traditional sand box. However, the parting surface typically houses the gating system and attached casting samples, and personnel need to operate from the parting surface, requiring a large amount of sand. Therefore, the outline dimensions of the mating surface between the upper sand box 1 and the lower sand box 2 remain unchanged. The variable pitch surface 8 is generally formed by disassembling a separate sand core or an outer mold block, thus the variable pitch surface 8 corresponds to the plane of the hexagonal sand box.
[0022] This technical solution has a simple structure and reasonable design. While retaining the original sand box's functions of hoisting, turning, ventilation, and high strength, it greatly reduces production costs and improves production efficiency.
[0023] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0024] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A sand mold for a wind turbine hub, characterized in that: The application relates to a sand box, which comprises a top sand box (1) and a bottom sand box (2) with the same structure, the side walls of the top sand box (1) and the bottom sand box (2) are hexagonal structures formed by alternately distributing three vertical side walls and three inclined side walls, the size of the top sand box (1) and the bottom sand box (2) gradually decreases from the open end to the sealed end, and the parting surface at the upper end of the bottom sand box (2) and the parting surface at the lower end of the top sand box (1) are both provided with positioning holes (3) and lock box holes for detachably connecting the top sand box (1) and the bottom sand box (2) into an integrated body through a bolt and a pin.
2. The sand mold for a windmill hub according to claim 1, characterized by: The three vertical side walls of the top sand box (1) and the bottom sand box (2) correspond to the positions of three variable-pitch surfaces (8) of a wind turbine hub casting (4) which is vertically placed in the sand box after being formed.
3. The sand mold for a windmill hub according to claim 2, characterized by: The three vertical side walls of the top sand box (1) and the bottom sand box (2) are all isosceles trapezoids with the length of the upper side being greater than the length of the lower side.
4. The sand mold for a windmill hub according to claim 1, characterized by: Lifting lugs (7) are arranged on the outer walls of the top sand box (1) and the bottom sand box (2) to facilitate lifting, and the top sand box (1) and the bottom sand box (2) are both provided with sand hanging strips (6) which are arranged in an inclined manner.
5. The sand mold for a windmill hub according to claim 1, characterized by: The inclination of the three inclined side walls of the top sand box (1) and the bottom sand box (2) is 15 DEG.
6. The sand box according to any one of claims 1-5, characterized in that: The sand consumption of the wind turbine hub casting (4) in the top sand box (1) and the bottom sand box (2) is 500 mm.