A casting sand box of a wind turbine gear box

Abstract

The utility model relates to a kind of casting sand box of wind generating set gear box, including sand box, the outer sand core that is profiled with gear box outside surface is equipped in the sand box, the inner sand core that is profiled with gear box inside surface is equipped in the outer sand core, the corresponding outer periphery of sand box and outer sand core is equipped with several radial through insertion hole, each insertion hole has the plugboard of cooperation, the plugboard is inserted into outer sand core inside by the insertion hole, its end portion is overlapped with the corresponding position of the inner sand core, the rib portion inside gear box can be formed by plugboard, and the outer surface of the inner sand core can be directly made into profiled surface matched with the inside surface of the gear box, avoid the gap of sand core and sand core cooperation position caused by the sand core structure formed by filling sand core on original inner sand core, pouring process can make molten iron inject into the gap and form joint, joint causes the surface of box body inner wall rough, need to be processed by artificial polishing defect.

Description

Technical Field

[0001] This utility model relates to the field of gearbox casting technology, and in particular to a casting sand box for a wind turbine gearbox. Background Technology

[0002] A wind turbine gearbox includes an upper gearbox plate, a lower gearbox plate, and an outer periphery connecting the upper and lower gearbox plates. The outer periphery is perpendicular to the upper and lower gearbox plates. The gearbox body has multiple radially arranged ribs. To form this part of the gearbox, the original casting sand box uses a combination of multiple sand cores for the sand core. Figure 3 and 4 As shown, one of the sand cores has multiple radial cavities to form ribs, and these cavities are open near the inner wall of the upper box plate. However, the inner wall of the upper box plate is flat. To form the inner wall of the upper box plate, a sand core is provided at each open position of the sand core for leveling, thus forming a smooth inner wall of the upper box plate. However, this sand core structure with sand cores for leveling will form a burr inside the gearbox after casting. This is because there is a gap at the position where the sand cores fit together, and the casting process will cause molten iron to enter the gap and form a burr. The burr makes the inner wall surface of the gearbox rough and requires manual grinding. However, since the burr is located on the inner wall of the gearbox, manual grinding of the burr is very inconvenient and requires a lot of workers and time, which increases the production cost. Utility Model Content

[0003] The purpose of this utility model is to overcome the defects in the existing technology and provide a casting sand box for a wind turbine gearbox.

[0004] To achieve the above objectives, the technical solution of this utility model is to design a casting sand box for a wind turbine generator gearbox, comprising a sand box, an outer sand core conforming to the outer side of the gearbox, and an inner sand core conforming to the inner side of the gearbox. The sand box and the corresponding outer periphery of the outer sand core are provided with a plurality of radially penetrating insertion holes, each insertion hole having a matching insertion plate. The insertion plate is inserted into the outer sand core through the insertion hole, and its end overlaps with the corresponding position of the inner sand core.

[0005] In a further preferred embodiment, the outer wall of the sand box is provided with four radially penetrating holes, the four holes being arranged in a fan-shaped interval. Correspondingly, the outer sand core is provided with a hole that communicates with the holes in the sand box. At the position of each hole, a plate is provided, the plate being connected to the inner sand core through the hole.

[0006] A further preferred technical solution is that two insertion holes are located on the outer side wall corresponding to the short side of the sand box, and the other two insertion holes are located on the outer side wall corresponding to the long side of the sand box near both ends of the short side.

[0007] A further preferred technical solution is that a rounded corner plate is provided on one side of each insert plate near the inner sand core, the rounded corner plate having a rounded corner that conforms to the shape of the gearbox, and the insert plate abuts against one side of the rounded corner plate.

[0008] The advantages and beneficial effects of this utility model are as follows: Ribs can be formed inside the gearbox by inserting a plate, and the outer surface of the inner sand core can be directly made into a contoured surface that matches the inner side of the gearbox. This avoids the gaps at the mating positions of the sand cores caused by filling the sand core structure on the original inner sand core. During the casting process, molten iron will be injected into the gaps and form burrs. Burrs cause the inner wall surface of the gearbox to be rough and require manual grinding. Ribs can be formed by inserting a plate externally, and the formation of burrs can be avoided. Attached Figure Description

[0009] Figure 1 This is a cross-sectional view of the present invention; Figure 2 This is a partial axonometric view of the present invention; Figure 3 This is a cross-sectional view of the existing structure of this utility model; Figure 4 This is a partial axonometric view of the existing structure of this utility model; In the diagram: 10, sand box; 20, outer sand core; 30, inner sand core; 40, rounded corner plate; 50, insert plate; 60, leveling sand core. Detailed Implementation

[0010] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0011] A wind turbine gearbox includes an upper gearbox plate, a lower gearbox plate, and an outer periphery connecting the upper and lower gearbox plates. The outer periphery is perpendicular to the upper and lower gearbox plates. The gearbox body has multiple radially arranged ribs, and several of these ribs have notches at the corners formed by the outer periphery and the upper gearbox plate, and also at the corners formed by the outer periphery and the lower gearbox plate. That is, the ribs bridge the inner wall of the outer periphery near the outer periphery, and are hollow between the ribs and the upper and lower gearbox plates. To cast the gearbox, the original casting sand core for this part is composed of multiple sand cores combined. Figure 3 and 4As shown, one of the sand cores has multiple radial cavities to form ribs, and these cavities are open near the inner wall of the upper box plate. However, the inner wall of the upper box plate is flat. To form the inner wall of the upper box plate, a sand core is provided at each open position of the sand core for leveling, thus forming a smooth inner wall of the upper box plate. However, this sand core structure with sand cores for leveling will form a burr inside the gearbox after casting. This is because there is a gap at the position where the sand cores fit together, and the casting process will cause molten iron to enter the gap and form a burr. The burr makes the inner wall surface of the gearbox rough and requires manual grinding. However, since the burr is located on the inner wall of the gearbox, manual grinding of the burr is very inconvenient and requires a lot of workers and time, which increases the production cost.

[0012] like Figure 1-2 As shown, this application provides a casting sand box for a wind turbine generator gearbox, including a sand box 10. The sand box 10 has an outer sand core 20 that conforms to the outer side of the gearbox, and an inner sand core 30 that conforms to the inner side of the gearbox. The sand box 10 and the outer sand core 20 have a plurality of radially penetrating insertion holes on their respective outer peripheries. Each insertion hole has a mating insertion plate 50. The insertion plate 50 is inserted into the outer sand core 20 through the insertion hole, and its end overlaps with the inner sand core 30 at a corresponding position. The outer surface of the inner sand core 30 at the overlap position has a conforming surface that matches the inner side of the gearbox.

[0013] The insert plate 50 can form the ribs inside the gearbox, and the outer surface of the inner sand core 30 can be directly made into a contoured surface that matches the inner side of the gearbox. This avoids the gaps at the mating positions of the sand cores caused by the original inner sand core 30 formed by filling the sand core 60. During the casting process, molten iron will be injected into the gaps and form burrs. Burrs cause the inner wall surface of the gearbox to be rough and require manual grinding. By inserting the insert plate 50 externally, ribs can be formed and the burrs can be avoided. Specifically, the sand box 10 is a rectangular open box. An outer sand core 20 is provided inside the open box. Multiple sand cores can be arranged circumferentially along the inner side of the box. The inner side of the outer sand core 20 has a contoured surface that matches the outer side of the gearbox. An inner sand core 30 is provided inside the outer sand core 20. The outer side of the inner sand core 30 has a contoured surface that matches the inner side of the gearbox.

[0014] In one embodiment, the outer wall of the sand box 10 is provided with four radially penetrating holes. The four holes are arranged in a fan-shaped interval, with two holes located on the outer wall corresponding to the short side of the sand box 10, and the other two holes located on the outer wall corresponding to the long side of the sand box 10 near the two ends of the short side. Correspondingly, the outer sand core 20 is provided with holes that communicate with the holes of the sand box. At the position of each hole, there is a plate 50. The plate 50 passes through the hole and abuts against the inner sand core 30. The plate 50 can form the rib of the gearbox.

[0015] In order to form the rounded corners of the corresponding gearbox ribs, a rounded corner plate 40 is provided on one side of the end of the insert plate 50 near the inner sand core 30. The rounded corner plate 40 has rounded corners that are similar to those of the gearbox. The insert plate 50 abuts against one side of the rounded corner plate 40. By assembling and combining in this way, both the rounded corners and the ribs can be formed.

[0016] When manufacturing the inner sand core 30, the structure of the inner sand core 30 formed by the insert plate 50 is similar to the internal structure of the gearbox. During casting, the insert plate 50 is pulled out to form the internal structure of the gearbox.

[0017] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A casting sand box for a wind turbine generator gearbox, characterized in that, The device includes a sand box, which contains an outer sand core that conforms to the outer side of a gearbox, and an inner sand core that conforms to the inner side of a gearbox. The sand box and the outer sand core have several radially penetrating holes on their respective outer peripheries. Each hole contains a mating insert plate, which is inserted into the outer sand core through the hole, with its end overlapping the corresponding position of the inner sand core.

2. The casting sand box for a wind turbine gearbox according to claim 1, characterized in that, The outer wall of the sand box is provided with four radially penetrating holes, which are arranged in a fan-shaped interval. Correspondingly, the outer sand core is provided with a hole that communicates with the holes of the sand box. At the position of each hole, there is a plate that passes through the hole and abuts against the inner sand core.

3. The casting sand box for a wind turbine gearbox according to claim 2, characterized in that, Two of the insertion holes are located on the outer wall of the sand box corresponding to the short side, and the other two insertion holes are located on the outer wall of the sand box corresponding to the long side near both ends of the short side.

4. A casting sand box for a wind turbine generator gearbox according to any one of claims 1-3, characterized in that, Each of the insert plates has a rounded corner plate on one side near the inner sand core. The rounded corner plate has a rounded corner that conforms to the shape of the gearbox, and the insert plate abuts against one side of the rounded corner plate.

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