Hub casting pouring structure of land wind generating set

Abstract

The utility model relates to a hub casting pouring structure of an onshore wind generating set, which comprises a lower die holder, a stepped accommodating cavity is arranged on the lower die holder, the accommodating cavity is divided into a plurality of small accommodating cavities by rib parts which are arranged in a protruding manner, a core part of the accommodating cavity is provided with a protruding pouring nest, and the core part of the pouring nest is provided with a straight pouring gate; each small containing cavity is provided with a suspended filter piece, the filter pieces and the small containing cavities form a filter box with a cavity in the center, and a fin type pouring gate is formed in the outer side of the filter box. A filter piece is arranged in the sprue, a filter piece pressing piece is arranged above the filter piece, the sprue is sleeved with the filter piece pressing piece and covered with the filter piece pressing piece, a filter cavity is formed between the filter piece pressing piece and the filter piece, and the sprue is communicated with the filter cavity; the special customized fan-shaped filter is adopted at the bottom, and the lower mold adopts precoated sand, so that the transition part of each runner is a smooth curve, the molten iron flow speed of the whole runner system is stable, and the casting quality is easy to improve.

Description

Technical Field

[0001] The utility model relates to the technical field of casting, in particular to a casting structure for a hub of an onshore wind turbine generator set. Background Art

[0002] Casting involves pouring molten metal into a mold cavity tailored to the part's shape and then allowing it to cool and solidify to produce a finished part or blank. Common defects found in castings include slag holes, air holes, sand holes, and cold shuts. Filters are often used to purify molten metal in castings to effectively remove slag, simplify the pouring system, prevent slag holes, improve the mechanical properties of the casting, and reduce machining allowances.

[0003] The hub is one of the main parts of wind turbines. The product is large in size, has many processing surfaces, complex dimensional relationships, and difficult to control the dimensions during the casting process. The wind turbine hub is an important component in wind turbine equipment. It has very high requirements for the quality of the casting and has strict regulations on casting defects and appearance quality. Due to the relatively complex hub structure, the existing wind turbine hub has a large number of sand cores during the casting process, and the sand cores are prone to movement during the box assembly process. There are also problems such as slag feeding into the casting, which affect the dimensional accuracy of the casting. The casting time is long, which affects the molding quality and efficiency of the casting. The existing casting process uses a large amount of sand, has high labor costs and low efficiency. Utility Model Content

[0004] The purpose of the utility model is to overcome the defects in the prior art and provide a casting structure for the hub of an onshore wind turbine generator set.

[0005] To achieve the above-mentioned object, the technical solution of the present invention is to design a casting structure for a hub of an onshore wind turbine generator set, comprising a lower die base having a stepped cavity, the cavity being divided into a plurality of small cavities by protruding ribs, the core of the cavity having a protruding pouring pocket, the core of the pouring pocket being provided with a sprue;

[0006] A suspended filter sheet is provided on each of the small cavities, the filter sheet and the small cavities form a filter box with a hollow center, and a slit-type gate is formed on the outside of the filter box;

[0007] A filter pressing plate is provided above the filter plate. The filter pressing plate is sleeved on the sprue and covers the filter plate. A filter cavity is formed between the filter pressing plate and the filter plate. The sprue is connected to the filter cavity.

[0008] A further preferred technical solution is that the cavity is a circular cavity, and the cavity includes a lower cavity and an upper cavity, and a cross-shaped rib is provided between the inner wall of the lower cavity and the outer wall of the pouring nest, and the ribs are fan-shaped ribs near the inner wall of the lower cavity and the outer wall of the pouring nest, and the middle part is a long strip of ribs, and the ribs are all stepped structures, and ribs extending along the fan-shaped ribs are provided in the upper cavity, dividing the cavity into four fan-shaped small cavities.

[0009] A further preferred technical solution is that the lower die base has an annular outer flange, the outer periphery of the outer flange has an annular flat flange, and the annular outer flange also has protruding semicircular lobes.

[0010] A further preferred technical solution is that the surface of the cavity on the lower die base is further provided with a coated sand coating.

[0011] A further preferred technical solution is that a group of annularly arranged pillars are provided on the upper end surface of the filter plate press, and the pillars are obliquely arranged on the upper end surface of the filter plate press.

[0012] The advantages and beneficial effects of the present invention are as follows: utilizing the shape structure of the cavity in the middle of the product, when designing the straight runner, it passes through the middle of the product, and a special customized fan-shaped filter is used at the bottom, and the lower mold is made of coated sand, so that the transition of each runner is a smooth curve, the molten iron flow rate of the entire runner system is stable, and it is easy to improve the quality of the casting; in accordance with the product structure to the greatest extent, while ensuring sufficient resin sand, the design adopts cold-drawn steel pipe straight runner, fan-shaped filter, annular seam gate, each gate is connected to a filter box, compared with the runner designed from the outside of the product, the amount of sand used is reduced, the production space is saved, and the production cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the axonometric drawing of the utility model;

[0014] Figure 2 This is a cross-sectional view of the utility model;

[0015] Figure 3 This is the axonometric drawing of the lower die base of the utility model;

[0016] Figure 4 This is the axonometric drawing of the filter of the utility model;

[0017] Figure 5 This is the axonometric drawing of the utility model's slit-type gate;

[0018] Figure 6 Axonometric drawing of the pouring structure for the implementation of this utility model;

[0019] Figure 7 This is a cross-sectional view of the pouring structure for implementing the present utility model.

[0020] In the figure: 10, lower die base; 11, outer flange; 12, semicircular convex petal; 13, upper cavity; 14, fan-shaped convex rib; 15, lower cavity; 16, convex rib; 17, pouring nest; 20, filter plate pressing piece; 30, straight runner; 40, seam gate; 50, filter plate; 60, product. DETAILED DESCRIPTION

[0021] The following embodiments are used to further describe the specific embodiments of the present invention in conjunction with the accompanying drawings and examples. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0022] Reference Figure 1-7 A casting structure for an onshore wind turbine hub includes a lower mold base 10 having a stepped cavity. The cavity is divided into several small cavities by protruding ribs. The core of the cavity has a protruding pouring socket 17, and the core of the pouring socket 17 has a core hole.

[0023] In one embodiment, the cavity is a circular cavity, which includes an upper cavity 13 and a lower cavity 15. A cross-shaped convex rib 16 is provided between the inner wall of the lower cavity 15 and the outer wall of the pouring nest. The convex rib 16 is close to the inner wall of the lower cavity and the outer wall of the pouring nest as a fan-shaped convex rib 14, and the middle part is a long strip of convex rib 16. Moreover, the convex ribs 16 are all stepped structures. A rib extending along the fan-shaped convex rib 14 is provided in the upper cavity 13, dividing the cavity into four fan-shaped small cavities.

[0024] In order to improve the stability of the lower mold base 10, the lower mold base 10 has an annular outer flange 11, and the outer periphery of the outer flange 11 has an annular flat flange, so that the lower mold base 10 can be placed stably; in order to improve the strength of the lower mold base 10, the annular outer flange also has protruding semicircular lobes 12. In one embodiment, the outer flange has three semicircular lobes 12 arranged in an annular array to improve the strength of the lower mold base 10.

[0025] The surface of the cavity on the lower die base 10 is further provided with a coated sand coating. By providing the coated sand coating on the lower die base 10, the high temperature resistance and corrosion resistance of the lower die base 10 can be improved.

[0026] A sprue 30 is provided on the core hole in the middle of the pouring nest 17 . The sprue 30 is vertically erected upward. The sprue 30 may be made of a cold-drawn steel pipe. When in use, the sprue 30 passes through the center of the upper mold.

[0027] A filter sheet 50 is provided on the convex rib 16 and is suspended over the small cavity. The filter sheet 50 and the small cavity form a filter box with a hollow center. The filter box has a slit-type gate 40 .

[0028] In one embodiment, the small cavity is a fan-shaped small cavity, the filter plate 50 is a fan-shaped filter plate, and the slot-type gate 40 is a fan-shaped gate formed by the outer edge of the fan-shaped filter plate and the small cavity.

[0029] In order to fix the filter 50, a filter press 20 is provided above the filter 50, and the filter press 20 is mounted on the straight runner 30 and covers the filter 50. In one embodiment, the filter press 20 is a circular press, and the lower end of the filter press 20 has an annular boss pressed on the edge of the filter 50. A filter cavity is formed between the filter press 20 and the filter 50, and the straight runner 30 is connected to the filter cavity. The upper end of the filter press 20 is a circular step-shaped, and a group of annular pillars are also provided on the upper end surface of the filter press 20. The pillars are inclined on the upper end surface of the filter press 20, and the pillars are used to connect with the support structure to press the filter 50 into the small cavity.

[0030] During pouring, the molten iron enters between the filter plate pressing plate 20 and the filter plate 50 provided on the lower mold base 10 through the sprue 30, is filtered by the filter plate 50, and then enters the filter box formed by the filter plate 50 and the small cavity, and then enters the mold cavity through the slotted gate 40 to form the product 60;

[0031] Taking advantage of the shape structure of the middle cavity of the product 60, when designing the straight runner 30, it passes through the middle of the product 60, and a special customized fan-shaped filter 50 is used at the bottom. The lower mold base uses coated sand, so that the transition points of each runner are smooth curves. The molten iron flow rate of the entire runner system is stable, which makes it easy to improve the quality of the casting. In accordance with the product structure to the greatest extent, while ensuring sufficient resin sand, the design uses cold-drawn steel pipe straight runner 30, fan-shaped filter 50, and annular seam gate 40. Each gate is connected to a filter box. Compared with the runner designed from the outside of the product 60, the amount of sand used is reduced, the production space is saved, and the production cost is reduced.

[0032] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A casting structure for a hub of an onshore wind turbine generator set, characterized in that: The mold base comprises a lower mold base having a stepped cavity, the cavity being divided into a plurality of small cavities by protruding ribs, the core of the cavity having a protruding pouring nest, and the core of the pouring nest having a sprue; A suspended filter sheet is provided on each of the small cavities, the filter sheet and the small cavities form a filter box with a hollow center, and a slit-type gate is formed on the outside of the filter box; A filter pressing plate is provided above the filter plate. The filter pressing plate is sleeved on the sprue and covers the filter plate. A filter cavity is formed between the filter pressing plate and the filter plate. The sprue is connected to the filter cavity.

2. The onshore wind turbine hub casting structure according to claim 1, characterized in that: The cavity is a circular cavity, and the cavity includes an upper cavity and a lower cavity. A cross-shaped convex rib is provided between the inner wall of the lower cavity and the outer wall of the pouring nest. The convex ribs are fan-shaped convex ribs near the inner wall of the lower cavity and the outer wall of the pouring nest, and the middle part is a long strip of convex ribs. The convex ribs are all stepped structures. Ribs extending along the fan-shaped convex ribs are provided in the upper cavity, dividing the cavity into four fan-shaped small cavities.

3. The onshore wind turbine hub casting structure according to claim 1 or 2, characterized in that: The lower die base is provided with an annular outer flange, the outer periphery of the outer flange is provided with an annular plane flange, and the annular outer flange is further provided with protruding semicircular lobes.

4. The onshore wind turbine hub casting structure according to claim 1 or 2, characterized in that: The surface of the cavity on the lower die seat is also provided with a coated sand coating.

5. The onshore wind turbine hub casting structure according to claim 1, characterized in that: A group of annularly arranged pillars are also provided on the upper end surface of the filter plate press, and the pillars are obliquely arranged on the upper end surface of the filter plate press.

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