Casting mold for rear box body of wind power gear box

Abstract

The utility model provides a casting die for a rear box body of a wind power gear box. The casting die is characterized in that an upper die, a middle die and a lower die are combined to form a cavity, a sprue is connected with the cavity through a runner, a sand core is arranged in the cavity, a barrel for connecting the middle die and the lower die is vertically arranged in the sand core, and a barb and a lifting hook are arranged in the barrel to fix the position of the sand core. The barrel and the middle die are stably connected through a counter bore and a locking piece. First risers are transversely arranged on the two sides of the middle mold sprue, and the runner design ensures uniform distribution of molten metal. An exhaust rope is further arranged in the sand core, parallel grooves are formed in the lower die, barbs are embedded in the parallel grooves, and channel steel is embedded in the sand core to enhance supporting. In addition, the mold core is vertically provided with a second riser, and the upper mold and the lower mold are internally provided with a plurality of groups of chilling blocks so as to improve the cooling efficiency. And the quality and the production efficiency of castings are improved while the problem of sand core floating is solved.

Description

Technical Field

[0001] This utility model relates to the field of wind turbine gearbox rear housing casting technology, specifically to a wind turbine gearbox rear housing casting mold. Background Technology

[0002] Wind turbines are a widely used type of generator in China, mainly composed of blades, hub, main shaft, gearbox, and frame. The gearbox includes a rear housing, which primarily supports and protects internal gears, bearings, and other critical components, ensuring their stable operation in the natural environment. Due to the large size of the rear housing, if the sand core is poorly secured or lacks sufficient strength, it can easily shift or float under the buoyancy of the molten metal during casting. This can lead to castings that do not meet design dimensional requirements or even result in scrap. Utility Model Content

[0003] The purpose of this invention is to improve the technical problem of sand core floating by improving the casting mold.

[0004] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0005] A casting mold for the rear housing of a wind turbine gearbox, comprising, from top to bottom, the following components:

[0006] The upper mold is equipped with an upper template and a gate.

[0007] The middle mold is equipped with side mold plates, and the gate of the upper mold extends to the side of the middle mold;

[0008] The lower mold is equipped with a lower template.

[0009] The upper mold, middle mold, and lower mold are combined to form a cavity, and the gate is connected to the runner, with the end of the runner connected to the cavity;

[0010] A sand core is installed inside the cavity, and a cylindrical body connecting the middle mold and the lower mold is vertically installed inside the sand core. The lower mold has a barb inside the cylindrical body, and a hook adapted to the barb is installed on the top of the cylindrical body.

[0011] Furthermore, the connection between the cylinder and the intermediate mold is designed as a countersunk hole, and a locking element is installed inside the countersunk hole. The locking element is interference-fitted with the countersunk hole, and a nut is fixedly installed on the locking element. The hook is threaded to match the nut. By rotating the nut, the locking element is brought into contact with the countersunk hole. Since the hook is restricted from rotating by the barb, further rotation of the nut will force the hook to move away from the barb, thereby achieving the locking function.

[0012] Furthermore, the lower mold has parallel grooves, and the barbs are S-shaped hooks. The S-shaped hooks are fixedly installed between the parallel grooves, with one end of the S-shaped hook embedded inside the lower mold and the other end of the S-shaped hook connected to the lifting hook.

[0013] Furthermore, an air venting rope is installed inside the sand core around the cylinder. The air venting rope is a hollow plastic rope that extends from the lower mold to the upper mold, with its end passing through the upper mold and communicating with the air.

[0014] Furthermore, a channel steel is horizontally embedded inside the sand core to support it.

[0015] To ensure sufficient flow of molten metal in the mold cavity, guarantee complete filling and stable solidification of the casting, reduce casting defects, and improve production efficiency and quality, the technical solution provided by this utility model further includes: the runner extends downward from the gate to the lower mold plate to form a main runner, the main runner bends upward to connect to the casting cavity in the middle of the mold cavity, the casting cavity is connected to multiple branch runners, the branch runners first pass downward through the lower mold plate, then bend upward to connect back to the mold cavity and are evenly distributed on the outer periphery of the mold cavity.

[0016] Furthermore, first risers are provided laterally on both sides of the gate of the intermediate mold, and the first risers are adapted to the plate-shaped structure of the casting.

[0017] Furthermore, a second riser is vertically provided in the sand core, which is adapted to the box structure of the casting.

[0018] Furthermore, multiple sets of short rod-shaped chills are evenly distributed within the cavity of both the upper and lower molds.

[0019] Furthermore, the chills are in the shape of short rods and are evenly distributed around the outer periphery of the casting.

[0020] The advantages and beneficial effects of this utility model are as follows:

[0021] 1. By vertically setting a cylinder connecting the middle mold and the lower mold inside the sand core, and setting a barb on the lower mold, and setting a hook on the top of the cylinder through a countersunk hole-thread structure, the hook and the barb can be locked together to effectively prevent the sand core from floating during the casting process, thus improving the quality of the casting.

[0022] 2. Two types of risers are specifically designed according to the structure of the casting. They can play the roles of venting and feeding during the casting process, reducing defects such as porosity inside the casting and preventing cracks. The two types of risers further improve the quality of the casting.

[0023] 3. The barb is an S-shaped hook, which is semi-embedded in the lower mold and fixed between the parallel grooves. This structural design makes the barb more stable and less prone to falling off. During operation, the hook can be inserted along the inner wall of the cylinder, and rotation will engage the barb, achieving quick locking. Channel steel is horizontally embedded inside the sand core to support it, improving its stability and load-bearing capacity. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 This is a schematic diagram of the lower mold of this utility model;

[0026] Figure 3 This is a structural schematic diagram of part A of this utility model;

[0027] Figure 4 This is a structural schematic diagram of the locking component of this utility model;

[0028] Figure 5 This is a schematic diagram of the structure of the sand core of this utility model;

[0029] Figure 6 This is one of the structural schematic diagrams of the casting of this utility model;

[0030] Figure 7 This is the second structural schematic diagram of the casting of this utility model;

[0031] In the picture:

[0032] 10-Upper mold, 20-Middle mold, 30-Lower mold, 40-Cavity, 41-Sand core, 42-Cylinder, 43-Counterhole, 44-Locking part, 45-Nut, 46-Hook, 47-Parallel groove, 48-Barb, 49-Channel steel, 410-Vent rope, 50-Gating gate, 51-Runner, 511-Main runner, 512-Branch runner, 52-Pouring cavity, 53-First riser, 54-Second riser, 55-Chiller. Detailed Implementation

[0033] 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. Example

[0034] A casting mold for the rear housing of a wind turbine gearbox comprises, from top to bottom, an upper mold 10, a middle mold 20, and a lower mold 30. The upper mold 10, after being filled with resin sand, forms the upper template of the casting; the middle mold 20, after being filled with resin sand, forms the side templates of the casting; and the lower mold 30, after being filled with resin sand, forms the lower template of the casting. The upper mold 10, middle mold 20, and lower mold 30 are combined to form a cavity 40. A gate 50 is provided on the upper mold, connecting to a runner 51, the end of which connects to the cavity 40.

[0035] A sand core 41 is installed inside the cavity 40. A cylindrical body 42, connecting the middle mold and the lower mold, is vertically installed inside the sand core 41. The connection between the cylindrical body 42 and the middle mold 20 is machined into a countersunk hole 43. A square locking element 44 is interference-fitted into the countersunk hole 43, and a nut 45 is fixed to the locking element 44. A hook 46 has threads machined on its surface to fit the nut 45 and is connected to the locking element 44 via these threads. The lower mold 30 has two sets of parallel grooves 47, each corresponding to a cylindrical body 42. A barb 48, an S-shaped hook, is fixed within the parallel groove 47. One end of the S-shaped hook is embedded inside the lower mold 30, and the other end is connected to the hook 46. A channel steel 49, supporting the sand core 41, is horizontally embedded inside the sand core 41. An venting rope 410 is also installed around the cylinder inside the sand core. The venting rope 410 is a hollow plastic rope made of PP material, and two ropes are installed around each cylinder. The venting rope 410 extends from the lower mold to the upper mold, and the end passes through the upper mold to communicate with the air.

[0036] To ensure sufficient flow of molten metal in the mold cavity, guarantee complete filling and stable solidification of the casting, reduce casting defects, and improve production efficiency and quality, this embodiment also adopts the following configuration. The runner 51 extends downwards from the gating gate 50 to the lower mold plate to form a main runner 511. The main runner bends upwards to connect to the casting cavity 52 in the middle of the mold cavity. The casting cavity 52 is connected to multiple branch runners 512, which first extend downwards to the lower mold plate, then bend upwards back to the mold cavity 40 and are evenly distributed around the outer perimeter of the mold cavity 40. First risers 53, with plate-shaped structures adapted to the casting, are laterally opened on both sides of the gating gate 50 of the intermediate mold 20. Second risers 54, with box-shaped structures adapted to the casting, are vertically opened on the sand core. Multiple sets of short rod-shaped chills 55 are evenly distributed within the mold cavity 40 from the upper mold 10 and lower mold 30.

[0037] Working principle:

[0038] The upper, middle, and lower molds are assembled sequentially to form a complete cavity. A sand core is placed inside the cavity to form the internal structure of the casting. The cylinder connects the middle and lower molds and is secured by countersunk holes and locking mechanisms. A hook and barb work together to ensure the stable position of the sand core within the cavity. Specifically, rotating the nut engages the locking mechanism with the countersunk hole. Because the hook's rotation is restricted by the barb, further rotation of the nut forces the hook to move away from the barb, thus achieving the locking function. This design ensures the stable position of the sand core within the cavity, preventing it from floating or shifting during molten metal filling. Channel steel supporting the sand core enhances its strength and prevents deformation. Venting ropes are installed inside the sand core to release gas from the cavity, preventing porosity defects. The molten metal enters the runner through the gating gate. The main runner extends downwards to the lower mold plate, then bends upwards to connect to the pouring cavity, and finally flows evenly through the branch runners to the outer periphery of the cavity to begin cooling and forming the casting. This design facilitates sufficient flow of the molten metal within the cavity, ensuring complete filling of the casting. Multiple sets of short, rod-shaped chills are evenly distributed within the mold cavity in both the upper and lower molds to accelerate the cooling rate of the casting and improve production efficiency. Simultaneously, the arrangement of the chills also helps control the internal structure and properties of the casting. First risers are horizontally opened on both sides of the gating gate in the intermediate mold to compensate for potential shrinkage of the molten metal during filling. Second risers are vertically opened in the sand core, similarly serving to compensate for shrinkage. These risers help reduce casting defects and improve production efficiency and quality.

[0039] 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 mold for the rear housing of a wind turbine gearbox, comprising, arranged sequentially from top to bottom: Upper mold (10), the upper mold is provided with an upper template and a gate (50); The middle mold (20) is provided with side mold plates, and the gate (50) extends into the middle mold; Lower mold (30), the lower mold is provided with a lower template; The upper mold (10), middle mold (20), and lower mold (30) are combined to form a cavity (40). The gate (50) is connected to a runner (51), and the end of the runner (51) is connected to the cavity (40). Its features are: A sand core (41) is provided inside the cavity (40). A cylindrical body connecting the middle mold (20) and the lower mold (30) is vertically provided inside the sand core (41). A barb (48) is provided inside the lower mold (30) in the cylindrical body (42). A hook (46) adapted to the barb (48) is provided on the top of the cylindrical body (42).

2. The casting mold for the rear housing of a wind turbine gearbox according to claim 1, characterized in that: The connection between the cylinder (42) and the middle mold (20) is set as a countersunk hole (43). A locking member (44) is provided in the countersunk hole (43). The locking member (44) is interference-fitted with the countersunk hole (43). A nut (45) is fixedly provided on the locking member (44). The hook (46) is provided with a thread that matches the nut (45).

3. The casting mold for the rear housing of a wind turbine gearbox according to claim 2, characterized in that: The lower mold (30) has parallel grooves (47), and the barb (48) is an S-shaped hook. The S-shaped hook is fixedly installed between the parallel grooves (47). One end of the S-shaped hook is embedded inside the lower mold (30), and the other end of the S-shaped hook is connected to the hook (46).

4. The casting mold for the rear housing of a wind turbine gearbox according to claim 3, characterized in that: The flow channel (51) extends downward from the gate to the lower mold (30) to form the main flow channel. The main flow channel (511) bends upward to connect to the casting cavity (52) in the middle of the cavity (40). The casting cavity (52) is connected to multiple branch flow channels (512). The branch flow channels (512) extend downward to the lower mold (30) and then bend upward to connect back to the cavity (40) and are evenly distributed on the outer periphery of the cavity (40).

5. The casting mold for the rear housing of a wind turbine gearbox according to any one of claims 1 to 4, characterized in that: An exhaust rope (410) is also provided inside the sand core (41) surrounding the cylinder (42). The exhaust rope (410) is a hollow plastic rope. The exhaust rope (410) extends from the lower mold (30) to the upper mold (10), and its end passes through the upper mold (10) to communicate with the air.

6. The casting mold for the rear housing of a wind turbine gearbox according to any one of claims 1 to 4, characterized in that: The sand core (41) is horizontally embedded with channel steel (49) for supporting the sand core (41).

7. The casting mold for the rear housing of a wind turbine gearbox according to claim 4, characterized in that: The middle mold (20) is provided with a first riser (53) in the horizontal direction, and the first riser (53) is adapted to the plate-shaped structure of the casting.

8. The casting mold for the rear housing of a wind turbine gearbox according to claim 4, characterized in that: The sand core (41) is vertically provided with a second riser (54), which is adapted to the box structure of the casting.

9. The casting mold for the rear housing of a wind turbine gearbox according to claim 4, characterized in that: The upper mold (10) and the lower mold (30) are provided with multiple sets of chills (55) in the cavity (40).

10. The casting mold for the rear housing of a wind turbine gearbox according to claim 9, characterized in that: The chills (55) are short rods and are evenly distributed around the outer periphery of the casting.

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