Runner structure of propeller sand casting mold
By improving the flow channel structure of the propeller sand casting mold and using impact-resistant ceramic plates and high-temperature resistant fiber filters, the problem of raw material impact sand was solved, ensuring the quality of propeller casting and reducing costs.
Patent Information
- Application Number
- CN202520277119.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-20
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-02-20
AI Technical Summary
The existing flow channel structure of propeller sand casting molds causes the raw material to impact the molding sand, resulting in the molding sand scattering and mixing with the raw material, which affects the quality of propeller casting and increases costs.
Design a flow channel structure for a propeller sand casting mold, including a vertically connected sprue, a horizontally connected second and third flow channels, and an impact-resistant ceramic plate and a high-temperature resistant fiber filter screen to slow down the flow rate of raw materials and disperse the impact force, and remove impurities through a sedimentation chamber and a filter screen.
It effectively reduces molding sand collapse, ensures raw material quality, improves propeller casting quality, and reduces costs.
Smart Images
Figure CN223819597U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of propeller processing technology, specifically to a flow channel structure for a propeller sand casting mold. Background Technology
[0002] A propeller is a type of propulsion device that uses rotating blades in water to convert engine power into thrust. Propellers are widely used in ships. Propeller production typically employs sand casting. During sand casting, runners are installed in the mold to transport molten material. Currently, most runners use a vertical channel or an L-shaped structure consisting of a horizontal and a vertical runner. However, as the material enters the runner, it impacts the sidewalls of the horizontally connected runners. This impact force causes the molding sand to scatter and deform. The scattered molding sand is carried along by the material, resulting in mixing between the material and the molding sand. Consequently, after the molten material solidifies, the presence of molding sand in the solidified material prevents the propeller blades from meeting the initial design requirements, reducing the casting quality and rendering the propeller unusable, thus increasing manufacturing costs. Utility Model Content
[0003] The purpose of this invention is to provide a flow channel structure for a propeller sand casting mold to solve the problems mentioned in the background art.
[0004] To achieve the above objectives, one objective of this utility model is to provide a flow channel structure for a propeller sand casting mold, including a mold shell, a feed inlet at the top of the mold shell, molding sand filling the interior of the mold shell, a forming cavity inside the molding sand, a guide flow channel located on one side of the forming cavity inside the molding sand, the guide flow channel connecting the feed inlet and the forming cavity together, the guide flow channel including a vertically connected sprue, one end of the sprue being connected to the feed inlet, a second flow channel being horizontally connected at the end of the sprue away from the feed inlet, a third flow channel being vertically connected at the side of the second flow channel away from the sprue, and the axes of the third flow channel and the sprue are not on the same straight line, a fourth flow channel being horizontally connected at the other end of the third flow channel, one end of the fourth flow channel being connected to the forming cavity, and a high-temperature resistant fiber filter screen being fixedly installed inside the third flow channel.
[0005] As a further improvement to this technical solution, the inner diameter of the second flow channel is larger than the inner diameter of the direct sprue, and the inner diameter of the third flow channel is larger than the inner diameter of the second flow channel.
[0006] As a further improvement to this technical solution, a sedimentation chamber is provided on the side of the second flow channel away from the sprue, and the sedimentation chamber is located between the sprue and the third flow channel.
[0007] As a further improvement to this technical solution, an impact-resistant ceramic plate is fixedly installed inside the second flow channel at a position away from the sprue. The axis of the sprue passes through the impact-resistant ceramic plate, and the side of the impact-resistant ceramic plate opposite to the sprue is set as an outer arc surface.
[0008] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0009] 1. The runner structure of this propeller sand casting mold includes a second runner with a larger inner diameter at the end of the sprue away from the feed inlet. This slows down the flow rate of the raw material entering the second runner and reduces the impact force of the raw material on the inner wall of the second runner. An impact-resistant ceramic plate is placed on the second runner at a position corresponding to the sprue. When the raw material impacts the inner wall of the second runner, the impact force is applied to the outer arc surface of the impact-resistant ceramic plate. The outer arc surface disperses and absorbs the impact force, improving the impact resistance of the second runner and preventing the molding sand inside the second runner from being dispersed and collapsed by the raw material. This ensures that the raw material can smoothly pass through the guide runner into the molding cavity to complete the casting of the propeller.
[0010] 2. The flow channel structure of this propeller sand casting mold includes a settling chamber between the impact-resistant ceramic plate and the third flow channel. This slows down the flow rate of the raw material entering the settling chamber, causing large particles of impurities in the raw material to settle to the bottom of the settling chamber, thus reducing the number of impurity particles in the raw material. At the same time, a high-temperature resistant fiber filter screen is installed inside the third flow channel to filter out small particles of impurities in the raw material. This ensures that the raw material entering the molding cavity does not contain impurities exceeding the qualified amount, thus guaranteeing the casting quality of the propeller. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0012] Figure 2 This is one of the overall structural cross-sectional views of this utility model;
[0013] Figure 3 This is the second sectional view of the overall structure of this utility model;
[0014] Figure 4 This is the third sectional view of the overall structure of this utility model;
[0015] Figure 5 For the present utility model Figure 4 Enlarged view of the structure at point A in the middle.
[0016] The meanings of the labels in the diagram are as follows:
[0017] 1. Mold shell; 11. Feed inlet;
[0018] 2. Molding sand; 21. Molding cavity;
[0019] 3. Material guide channel; 31. Direct sprue; 32. Second flow channel; 321. Settling chamber; 322. Impact-resistant ceramic plate; 33. Third flow channel; 34. Fourth flow channel; 35. High-temperature resistant fiber filter screen. Detailed Implementation
[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0021] Example 1
[0022] Please see Figures 1-5 As shown, one of the objectives of this embodiment is to provide a flow channel structure for a propeller sand casting mold, including a mold shell 1, which is composed of multiple stacked square frames. A feed inlet 11 is provided at the top of the mold shell 1, and the feed inlet 11 is connected to an external casting hopper. Molding sand 2 is filled inside the mold shell 1, and a forming cavity 21 is provided inside the molding sand 2. The forming cavity 21 is used to place the mold core for casting the propeller. A material guide channel 3 is provided on one side of the forming cavity 21 inside the molding sand 2. The material guide channel 3 connects the feed inlet 11 and the forming cavity 21. When the molten raw material inside the casting hopper enters the feed inlet 11 under the action of gravity, the raw material enters the mold core inside the forming cavity 21 through the material guide channel 3. When the raw material cools and solidifies in the mold core, the casting of the propeller is completed.
[0023] To address the issue of the molding sand particles following the flow of the raw material 2 due to its impact, the structure of the guide channel 3 is detailed below. The guide channel 3 includes a vertically connected sprue 31 with its axis vertically aligned. One end of the sprue 31 is connected to the inlet 11. The end of the sprue 31 furthest from the inlet 11 is laterally connected to a second channel 32. The side of the second channel 32 furthest from the sprue 31 is vertically connected to a third channel 33. Specifically, the sprue 31 and the third channel 33 are respectively connected to the upper and lower ends of the sidewalls of the laterally aligned second channel 32, and the axes of the third channel 33 and the sprue 31 are not on the same straight line. The other end of the third channel 33 is laterally connected to a fourth channel 34, one end of which is connected to the molding cavity 21. The second channel 32, the third channel 33, and the fourth channel 34 are all connected in this configuration. The components are combined to form a Z-shape. By staggering the sprue 31 and the third runner 33, a buffer zone, namely the second runner 32, is ensured between the sprue 31 and the third runner 33. This avoids the raw material from directly entering the fourth runner 34, shortens the vertical flow distance of the raw material, reduces the impact force of the raw material on the molding sand 2, and prevents the raw material from damaging the side wall of the fourth runner 34. When the molten raw material enters the interior of the feed inlet 11 under the action of gravity, the raw material first flows vertically along the interior of the sprue 31, and then enters the interior of the second runner 32 and flows laterally towards the third runner 33. Then, the raw material in the second runner 32 is transported to the fourth runner 34 through the third runner 33. The fourth runner 34 guides the raw material into the molding cavity 21, thereby completing the casting of the propeller blade.
[0024] However, during the process of conveying the raw material from the sprue 31 to the second runner 32, the flow direction of the raw material changes. When the raw material enters the second runner 32, it impacts the sidewall of the runner 32 due to inertia. When the raw material impacts the inner wall of the second runner 32, the molding sand 2 on the inner wall is easily deformed and collapsed under the impact force. This collapsed portion of molding sand 2 mixes with the flowing raw material, causing it to be carried into the molding cavity 21, thus affecting the quality of the propeller casting. To prevent the raw material from being carried into the second runner 32... The molding sand 2 on the wall is dispersed. First, the inner diameter of the second flow channel 32 is designed to be larger than the inner diameter of the sprue 31. When the raw material enters the interior of the second flow channel 32 through the sprue 31, the increased flow cross-section of the flow channel slows down the flow velocity of the raw material, thereby reducing the impact force of the raw material on the second flow channel 32. At the same time, an impact-resistant ceramic plate 322 is fixedly installed inside the second flow channel 32 at a position away from the sprue 31. The impact-resistant ceramic plate 322 is made of high-temperature resistant ceramic and will not stick to the molten raw material. The axis of the sprue 31 passes through the impact-resistant ceramic plate. Plate 322, and the side of the impact-resistant ceramic plate 322 opposite to the sprue 31 is set as an outer arc surface, that is, the outer arc surface of the impact-resistant ceramic plate 322 is set towards the direction close to the sprue 31. When the raw material flows out of the sprue 31, the raw material will directly contact the outer arc surface of the second flow channel 32. At this time, the impact-resistant ceramic plate 322 blocks the raw material and reduces the force of the raw material impacting the molding sand 2. At the same time, the outer arc surface of the second flow channel 32 decomposes the impact force on the outer arc surface. At this time, the impact force is decomposed into two components: one along the tangential direction of the outer arc surface. Another component of the force along the normal direction of the outer arc surface will cause the impact-resistant ceramic plate 322 to deform in the tangential direction, while the component of the force along the normal direction will cause the impact-resistant ceramic plate 322 to compress in the normal direction. Through this decomposition and distribution of force, the outer arc surface can better disperse and withstand the impact force, thereby improving the impact resistance of the second flow channel 32 and preventing the molding sand 2 inside the second flow channel 32 from being dispersed and collapsed by the raw material. This ensures that the raw material can smoothly pass through the guide flow channel 3 into the molding cavity 21 to complete the casting of the propeller.
[0025] The molten raw material contains some solid impurities. If these impurities enter the molding cavity 21 and solidify into a propeller, the propeller quality will be substandard. To solve this problem, a settling chamber 321 is provided inside the second runner 32 on the side away from the sprue 31. The settling chamber 321 is located between the sprue 31 and the third runner 33. The inner diameter of the third runner 33 is larger than the inner diameter of the second runner 32. When the raw material flows along the second runner 32, it first enters the settling chamber 321. After the raw material enters the connection between the second runner 32 and the settling chamber 321... As the space here increases, the flow rate will further slow down. At this time, large solid impurities in the molten raw material will sink to the bottom of the settling chamber 321 due to their own weight, reducing the content of solid impurities in the raw material. The raw material located in the upper layer of the settling chamber 321 will overflow the settling chamber 321 and enter the interior of the third flow channel 33. At the same time, because the inner diameter of the third flow channel 33 is larger than the inner diameter of the second flow channel 32, the raw material entering the interior of the third flow channel 33 will slow down again, further reducing the flow rate of the raw material, thereby reducing the impact force of the raw material on the molding sand 2 and ensuring that the molding sand 2 will not deform or collapse during use.
[0026] Meanwhile, a high-temperature resistant fiber filter screen 35 is fixedly installed inside the third flow channel 33. The high-temperature resistant fiber filter screen 35 is made of high-temperature resistant ceramic and will not stick to the molten raw material. The high-temperature resistant fiber filter screen 35 has several filter holes with an inner diameter smaller than the diameter of the solid impurities. When the molten raw material flows inside the third flow channel 33, the raw material will pass through the filter holes on the high-temperature resistant fiber filter screen 35. The high-temperature resistant fiber filter screen 35 will block the solid impurities in the raw material and some of the falling molding sand 2 on the side of the high-temperature resistant fiber filter screen 35 near the second flow channel 32. The raw material with the solid impurities removed will enter the interior of the fourth flow channel 34 and then enter the molding cavity 21 along the fourth flow channel 34 to solidify and form. This ensures that the cast propeller does not contain impurities exceeding the qualified amount and ensures the casting quality of the propeller.
[0027] This design utilizes the second flow channel 32 and the impact-resistant ceramic plate 322 to slow down the flow rate of the raw material entering the second flow channel 32, reducing the impact force of the raw material on the inner wall of the second flow channel 32 and preventing the molding sand 2 inside the second flow channel 32 from being dispersed and collapsed by the raw material. At the same time, a sedimentation chamber 321 is set inside the second flow channel 32 to slow down the flow rate of the raw material entering the sedimentation chamber 321, allowing large particles of impurities in the raw material to settle to the bottom of the sedimentation chamber 321. Meanwhile, a high-temperature resistant fiber filter screen 35 is set inside the third flow channel 33 to filter out particulate impurities and molding sand 2 in the raw material, thereby ensuring that the raw material entering the molding cavity 21 does not contain impurities exceeding the qualified amount, thus ensuring the casting quality of the propeller.
[0028] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A flow channel structure for a propeller sand casting mold, comprising a mold shell (1), characterized in that: The mold shell (1) has a feed inlet (11) at the top. The mold shell (1) is filled with molding sand (2). The molding sand (2) has a molding cavity (21) inside. A material guide channel (3) is provided on one side of the molding cavity (21) inside the molding sand (2). The material guide channel (3) connects the feed inlet (11) and the molding cavity (21). The material guide channel (3) includes a vertically connected sprue (31). One end of the sprue (31) is connected to the feed inlet (11). The second flow channel (32) is horizontally connected to the end away from the feed inlet (11). The third flow channel (33) is vertically connected to the side of the second flow channel (32) away from the sprue (31). The axes of the third flow channel (33) and the sprue (31) are not on the same straight line. The other end of the third flow channel (33) is horizontally connected to the fourth flow channel (34). One end of the fourth flow channel (34) is connected to the molding cavity (21). A high-temperature resistant fiber filter screen (35) is fixedly installed inside the third flow channel (33).
2. The flow channel structure of the propeller sand casting mold according to claim 1, characterized in that: The inner diameter of the second flow channel (32) is larger than the inner diameter of the sprue (31), and the inner diameter of the third flow channel (33) is larger than the inner diameter of the second flow channel (32).
3. The flow channel structure of the propeller sand casting mold according to claim 1, characterized in that: A sedimentation chamber (321) is provided on the side of the second flow channel (32) away from the sprue (31), and the sedimentation chamber (321) is located between the sprue (31) and the third flow channel (33).
4. The flow channel structure of the propeller sand casting mold according to claim 1, characterized in that: An impact-resistant ceramic plate (322) is fixedly installed inside the second flow channel (32) at a position away from the sprue (31). The axis of the sprue (31) passes through the impact-resistant ceramic plate (322), and the side of the impact-resistant ceramic plate (322) opposite to the sprue (31) is set as an outer arc surface.