Aluminum die casting semi-solid slurry making crucible bottom drag

Abstract

The utility model discloses a bottom drag for aluminum die casting semi -solid slurry making crucible, is used for supporting the bottom of tubular crucible and drives the tubular crucible overturn and horizontal rotation, including the bottom drag body of whole overhead contour is drop shape, and the bottom drag body includes bottom wall and the annular side wall of upward extension, and the annular side wall is along the height direction and inclines and expands outward, in the circumferential profile of annular side wall, one side is smooth arc line and converges inward, forms a inward protruding tip, in addition to the tip, the other position of annular side wall circumferential all is outward convex arc part, and the bottom drag body closes tubular crucible bottom wall, and any from the contact surface gap of tubular crucible and the bottom drag body seeping out aluminum liquid all will be gathered along the bottom drag body tip of tip under the action of gravity and drop or flow out, will have destructive, random aluminum liquid leakage, changes for predictable, controllable directional discharge, thereby completely avoids its pollution and damage below core moving part.

Description

Technical Field

[0001] This utility model relates to a semi-solid die casting slurry preparation device, and more particularly to a crucible bottom trolley for semi-solid slurry preparation in aluminum die casting. Background Technology

[0002] In the aluminum die-casting process, semi-solid slurry technology is a unique metal forming method. Its core characteristic lies in the transitional state between liquid and solid during metal processing. During operation, technicians apply mechanical action, physical regulation, or chemical intervention at key stages of metal solidification to transform the molten metal into a semi-solid slurry with a non-dendritic structure. The die-casting process then completes the forming process, ultimately producing castings with excellent density and few defects. From a technical perspective, this technology not only significantly enhances the mechanical properties of castings and reduces quality problems such as porosity and shrinkage cavities, but also reduces the thermal shock experienced by the mold, helping to extend its service life. It has now become a key development area in the high-end aluminum alloy die-casting field.

[0003] Among the relevant patent achievements, the patent document with authorization announcement number CN215746293U and titled "Pulping Machine and Semi-Solid Metal Slurry Die Casting System" proposes a slurry preparation scheme based on vacuum stirring. The core of this scheme lies in the cooperation between the vacuum chamber, the equipment cover, the chamber body, and the stirring device to carry out slurry preparation in a vacuum environment, thereby further improving the uniformity and density of the slurry structure.

[0004] Another patent document, CN217252677U, entitled "A Semi-Solid Pulping Machine and a Semi-Solid Pulping Die Casting System," discloses a differentiated technical approach. Its innovation lies in using a raw material rod as the stirring medium, and achieving the stirring of the metal broth through the coordinated operation of grippers, a rotary drive component, and a displacement drive component. This design effectively solves the problem of easy wear and tear on traditional stirring rods, and is of great significance for improving equipment reliability and optimizing the level of automation.

[0005] It is noteworthy that both of the aforementioned patents employ a stirring technique in the slurry preparation stage. However, in their actual research and development, the inventors broke through traditional designs and developed a novel slurry-making device: this device drives a cylindrical crucible to rotate and shake, creating intense eddies and shearing motions in the molten metal. This efficiently breaks down the dendritic network within the metal, transforming it into uniform, fine rose-shaped or spherical crystals, ultimately yielding a high-quality semi-solid slurry. To adapt to the device's unique crucible structure, the inventors also needed to simultaneously develop a matching bottom support component. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a crucible bottom trolley for semi-solid slurry preparation in aluminum die casting.

[0007] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a crucible bottom support for semi-solid slurry preparation of aluminum die casting, used to support the bottom of a cylindrical crucible and drive the cylindrical crucible to flip and rotate horizontally, including a bottom support body with an overall top view profile in the shape of a teardrop, the bottom support body including a metal support substrate and a silicon carbide or silicon nitride / silicon carbide composite layer covering the upper surface of the metal support substrate; the bottom support body includes a bottom wall and an upwardly extending annular sidewall, the annular sidewall expanding outward along the height direction; in the circumferential contour of the annular sidewall, one side is a smooth arc converging inward to form an inwardly protruding tip; except for the tip, the other positions of the annular sidewall in the circumferential direction are all outwardly protruding arc portions.

[0008] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: the rear side of the arc portion is integrally formed with a flip bracket, the flip bracket is connected to a flip drive mechanism, the flip drive mechanism drives the flip bracket, and when the bottom drag body flips downward toward the side away from the flip bracket, the top of the tip is located at the lowest position of the bottom drag body.

[0009] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: the flipping bracket includes a horizontal part and connecting arms extending downward from both sides of the horizontal part. The connecting arms are used to connect to the flipping drive mechanism so that the bottom drag body is driven by the flipping drive mechanism to achieve flipping.

[0010] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: the tip includes an inclined drainage surface, and the inclination angle of the drainage surface is in the range of 15-45°.

[0011] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: the middle part of the bottom wall is recessed inward to form a middle recessed part and an outer annular convex edge.

[0012] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: the two sides of the annular sidewall are integrally formed with connecting ears, and the outer end face of the connecting ears is provided with a mounting part, which is used to fix the clamping assembly for clamping the cylindrical crucible.

[0013] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: the clamping assembly includes a cylinder and a pressing arm. The pressing arm includes a horizontal arm connected to the output end of the cylinder, a vertical arm connected to the outer end of the horizontal arm, and a plurality of pressing fingers extending laterally outward from the lower end of the vertical arm.

[0014] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: each of the clamping components includes two pressing fingers, which are spaced apart from each other and located on both sides of the cylindrical crucible.

[0015] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: the pressure finger is arc-shaped towards the inner wall of the cylindrical crucible to adapt to the outer peripheral wall of the cylindrical crucible.

[0016] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is: the diameter of the cylindrical crucible is smaller than the diameter of the recessed portion;

[0017] An annular rib is integrally formed on the outer peripheral wall of the lower section of the cylindrical crucible, and the distance between the lower surface of the annular rib and the bottom surface of the cylindrical crucible is greater than the height of the recess.

[0018] Compared with the prior art, the advantages of this utility model are: the crucible bottom trolley for semi-solid slurry preparation of aluminum die casting is used to support the bottom of the cylindrical crucible and drive the cylindrical crucible to flip and rotate horizontally. The bottom trolley body seals the bottom wall of the cylindrical crucible. Any aluminum liquid seeping from the gap between the cylindrical crucible and the bottom trolley body will be collected by the tip under the action of gravity and drip or flow out along the direction of the tip of the bottom trolley body, instead of spreading randomly. This setting transforms the destructive and random aluminum liquid leakage into predictable and controllable directional discharge, thereby completely avoiding its contamination and damage to the core moving parts below. This greatly improves the long-term operational reliability and service life of the equipment. Attached Figure Description

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present invention. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0020] Figure 1 This is a schematic diagram of a crucible-type semi-solid pulping machine.

[0021] Figure 2 This is a schematic diagram of a single station of a crucible-type semi-solid pulping machine.

[0022] Figure 3 An exploded view of a single station of a crucible-type semi-solid pulping machine.

[0023] Figure 4 A schematic diagram of a crucible bottom support and a crucible for semi-solid slurry preparation in aluminum die casting;

[0024] Figure 5 This is a schematic diagram of a crucible bottom support for semi-solid slurry preparation in aluminum die casting. Detailed Implementation

[0025] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0026] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it will not be further defined and explained in subsequent figures.

[0027] In the description of this utility model, it should be noted that the terms "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model. Similarly, "first" and "second" are only for ease of understanding and have no other directional meaning, and cannot be considered as limitations on this utility model.

[0028] like Figure 1-3 As shown, this embodiment provides a crucible-type semi-solid pulping machine, including a cylindrical crucible 1, a frame 2, and an aluminum die-cast semi-solid pulping crucible bottom support 3, a flipping drive mechanism 5, and a rotating mechanism integrated on the frame 2.

[0029] like Figure 4-5 As shown, the crucible bottom trolley 3 for semi-solid slurry preparation in aluminum die casting includes a bottom trolley body 300, which comprises a metal support substrate and a silicon carbide or silicon nitride / silicon carbide composite layer covering the upper surface of the metal support substrate. The metal support substrate provides sufficient strength to the bottom trolley, while the silicon carbide or silicon nitride / silicon carbide composite layer is sufficient to resist severe mechanical wear caused by solid particles in the aluminum slurry and agitation. SiC or Si3N4 has poor wettability with molten aluminum at high temperatures and reacts very slowly. A dense oxide layer of SiO2 forms on their surface, which effectively prevents further penetration and corrosion of the molten aluminum. Both silicon carbide or silicon nitride / silicon carbide composite layers are existing inorganic materials.

[0030] The undercarriage body 300 includes a bottom wall 31 and an upwardly extending annular sidewall 32, which expands outward along the height direction. The overall top view of the undercarriage body 30 is teardrop-shaped. In the circumferential profile of the annular sidewall 32, one side is a smooth arc that converges inward to form an inwardly protruding tip 321. Except for the tip 321, the other circumferential positions of the annular sidewall 32 are all outwardly protruding arcuate portions 322.

[0031] like Figure 3 As shown, the tilting drive mechanism 5 is mounted on the rotating mechanism, and the crucible bottom support 3 for semi-solid slurry preparation of aluminum die casting is connected to the tilting drive mechanism 5. The tilting drive mechanism 5 can adjust the angle between the bottom support body 30 and the horizontal plane by rotating. The cylindrical crucible 1 is a cylindrical structure with open ends, and the crucible bottom support 3 for semi-solid slurry preparation of aluminum die casting is used to support the bottom of the cylindrical crucible 1.

[0032] like Figure 1 As shown, the pulper has three operating states:

[0033] First state: The flipping drive mechanism 5 drives the cylindrical crucible 1 to flip forward, so that the opening of the cylindrical crucible 1 tilts forward to realize the feeding operation.

[0034] Second state: The flipping drive mechanism 5 is adjusted so that the opening of the cylindrical crucible 1 is vertically upward. At this time, the rotating mechanism is running, which drives the flipping drive mechanism 5 to drive the cylindrical crucible 1 to rotate on the horizontal plane.

[0035] Third state: The flipping drive mechanism 5 drives the cylindrical crucible 1 to flip backward to realize the material feeding operation.

[0036] In the first loading state, the top of the tip 321 is located at the low position of the bottom trolley body 30.

[0037] It should be understood that in the first state, the bottom drag body 30 and the cylindrical crucible 1 are tilted. Since the cylindrical crucible 1 is held on the bottom drag body 30, and the two are not welded or bolted together, there is a possibility of local micro-gaps due to processing errors, thermal deformation, or foreign objects. High-temperature molten aluminum has excellent fluidity. Once a gap exists, the molten aluminum will seep out rapidly under the action of gravity. If the seeping molten aluminum flows everywhere, it will solidify on the bottom tray and overflow onto key moving parts such as the rotating mechanism and the tilting drive mechanism 5, causing equipment jamming, component damage, or even serious safety accidents. The tip 321 can collect the leaked molten aluminum at this point. Furthermore, the top of the tip 321 is located at the lowest point of the entire bottom drag body 30. Based on the property that liquids always flow downhill, any molten aluminum seeping from the gap between the cylindrical crucible 1 and the bottom support body 30 will naturally flow along the wall of the bottom support body 30 towards this lowest point under the influence of gravity. The collected molten aluminum will then drip or flow out in the direction of this tip, rather than spreading randomly. This design transforms destructive, random molten aluminum leakage into predictable and controllable directional discharge, completely avoiding contamination and damage to the core moving parts below. This significantly improves the long-term operational reliability and service life of the equipment.

[0038] like Figure 4-5 As shown, the bottom wall 31 of the base tractor body 30 is recessed inward in the middle, forming a central recessed portion 311 and an outer annular protrusion 322. The inner diameter of the recessed portion 311 is larger than the outer diameter of the cylindrical crucible 1. This concave-convex design is similar to a reinforcing rib, which improves the deformation resistance of the base tractor body 30 under high temperature and heavy load, ensuring the reliability of long-term use.

[0039] like Figure 2 , 4 As shown in Figure 5, the cylindrical crucible 1 is inserted into the recess 311, which can temporarily store the overflowing molten aluminum. In addition, the annular convex edge 322 plays a certain positioning role for the bottom of the cylindrical crucible 1, while enhancing the sealing effect of the bottom support body 30 on the bottom end of the cylindrical crucible 1, reducing the probability of initial molten aluminum overflow.

[0040] In a preferred embodiment, the inner diameter of the recess 311 is adapted to the outer diameter of the cylindrical crucible 1. This recess design increases the contact surface area between the bottom support body 30 and the slurry, accelerates the cooling rate of the bottom slurry, facilitates the formation of finer microstructures, and enables the formation of a non-flowing bottom slurry in a shorter time, preventing aluminum melt from overflowing during subsequent stirring.

[0041] like Figure 2 , 4As shown in Figure 5, the tip 321 includes an inclined guide surface 320, the inclination angle of which ranges from 15° to 45°. The inclined guide surface 320 has a shape that is narrow at the front end and wide at the rear end. This pre-designed inclined surface ensures that the molten aluminum can flow out smoothly at an appropriate speed, avoiding accumulation and solidification at the tip 321 that could cause blockage, thus ensuring the long-term effectiveness of the guide channel. By optimizing the inclination angle to provide sufficient flow driving force and by accelerating the outflow through shape design, it is ensured that the molten aluminum is discharged before solidification. This fundamentally solves the risk of the guide channel itself being blocked by solidified metal, ensuring the long-term effectiveness and reliability of this safety function.

[0042] like Figure 2-5 As shown, a flip bracket 53 is integrally formed on the rear side of the arc portion 322. The flip bracket 53 is connected to the flip drive mechanism 5, and the flip drive mechanism 5 drives the flip bracket 53. When the base trailer body 300 flips downward toward the side away from the flip bracket 53, the top of the tip 321 is located at the lowest position of the base trailer body 300. Connecting ears 33 are provided on both sides of the base trailer body 300. The outer end face of the connecting ears 33 is provided with a mounting part 331, and the clamping assembly 4 is fixed on the mounting part 331.

[0043] It should be noted that, such as Figure 3-5 The connecting lug 33, the flip bracket 53, and the base tractor body 30 are integrally molded. The base tractor body 30 and the connecting lug 33 are cast from the same material. During operation, they are heated and expanded simultaneously and at the same rate. This ensures that the relative positional relationship between the mounting part of the clamping assembly 4 and the sealing surface of the base tractor body 30 remains unchanged regardless of temperature changes, avoiding clamping force loosening or sealing failure due to uneven thermal expansion.

[0044] like Figure 3-5 As shown, the flipping bracket 53 includes a horizontal part 532 and connecting arms 531 extending downward from both sides of the horizontal part. The connecting arms 531 are used to connect the flipping drive mechanism 5 so that the bottom drag body 30 is driven by the flipping drive mechanism 5 to flip.

[0045] like Figure 2 As shown, Figure 3-4 As shown, the clamping assembly 4 includes a cylinder 41 and a pressing arm 42. The cylinder 41 drives the pressing arm 42 to press down. The pressing arm 42 includes a horizontal arm 423 connected to the output end of the cylinder and a vertical arm 422 connecting the two horizontal arms 423. The lower end of the vertical arm 422 extends outward to form a plurality of pressing fingers 421.

[0046] like Figure 2As shown, in this embodiment, each clamping component 4 has two spaced-apart pressure fingers 421 at its front end. The pressure fingers 421 are located on opposite sides of the circumference of the cylindrical crucible 1, and the pressure fingers are arc-shaped facing the inner wall of the cylindrical crucible to adapt to the outer circumference of the cylindrical crucible. The cylinder 41 provides power, and the force is amplified through the lever-type transmission arm, ultimately achieving precise and stable downward pressure by the two pressure fingers 421. In this embodiment, the two clamping arms 42 are located on both sides of the cylindrical crucible 1 in the first direction, and the two pressure fingers 421 of one clamping arm 42 are on both sides of the cylindrical crucible 1 in the second direction; the four-point clamping on both sides ensures that the cylindrical crucible 1 is subjected to uniform force in the circumference, avoiding poor sealing or damage to the cylindrical crucible 1 due to force on one side.

[0047] like Figure 4-5 As shown, an annular rib 11 is pre-cast or machined on the outer peripheral wall of the cylindrical crucible 1. The clamping end of the clamping assembly 4 does not press directly against the opening of the cylindrical crucible 1, but rather abuts against this annular rib 11. By pressing the annular rib 11 downwards, a force is generated that presses the cylindrical crucible 1 firmly against the bottom support body 30, achieving a seal. This arrangement avoids the clamping force acting directly on the weak open edge of the cylindrical crucible 1, preventing deformation or damage due to stress concentration and extending the service life of the cylindrical crucible 1.

[0048] Preferably, the annular rib 11 is disposed in the lower section of the cylindrical crucible 1, and the distance between the lower surface of the annular rib 11 and the bottom surface of the cylindrical crucible 1 is slightly greater than the height of the recess 311. The annular rib 11 is a circumferentially continuous, thickened cross-section reinforcing structure, providing a robust, stable, and pressure-bearing platform for the clamping assembly 4. The clamping force acts on the lower section of the cylindrical crucible 1, and the force flow is transmitted more directly, ensuring the seal between the bottom of the cylindrical crucible 1 and the bottom support body 30, preventing aluminum leakage. The distance between the lower surface of the annular rib 11 and the bottom surface of the cylindrical crucible 1 is slightly greater than the height of the recess 311, so that the lower end of the cylindrical crucible 1 can be confined within the recess 311, while the annular rib 11 can cover the gap between the lower end of the cylindrical crucible 1 and the annular convex edge 322 of the bottom support body 30, further improving stability and sealing.

[0049] like Figure 3 As shown, the tilting drive mechanism 5 includes a servo motor 51 and a reducer 52. The servo motor 51 provides precise angular displacement and torque control, while the reducer 52 amplifies the torque to smoothly support and drive the fully loaded cylindrical crucible 1. The two-point support structure of the double connecting arms 531 ensures that the bottom support body 30 and the cylindrical crucible 1 are subjected to uniform force, have good rigidity, and operate stably during tilting and rotation.

[0050] This article uses specific examples to introduce the principle and implementation of this utility model, and describes the crucible bottom drag for semi-solid slurry preparation of aluminum die casting provided by this utility model. The above description of the embodiments is only for the purpose of helping to understand this utility model and its core ideas. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A crucible bottom support for semi-solid slurry preparation in aluminum die casting, used to support the bottom of a cylindrical crucible and drive the cylindrical crucible to flip and rotate horizontally, characterized in that: The product includes a base body with an overall top view profile resembling a teardrop shape. The base body includes a metal support substrate and a silicon carbide or silicon nitride / silicon carbide composite layer covering the upper surface of the metal support substrate. The base body includes a bottom wall and an upwardly extending annular sidewall. The annular sidewall expands outward along the height direction. In the circumferential contour of the annular sidewall, one side converges inward in a smooth arc to form an inwardly protruding tip. Except for the tip, the other circumferential positions of the annular sidewall are all outwardly protruding arc portions.

2. The crucible bottom support for semi-solid slurry preparation in aluminum die casting according to claim 1, characterized in that: The rear side of the arc portion is integrally formed with a flip bracket, which is connected to a flip drive mechanism. The flip drive mechanism drives the flip bracket. When the bottom mop body flips downward toward the side away from the flip bracket, the top of the tip is located at the lowest position of the bottom mop body.

3. The crucible bottom support for semi-solid slurry preparation in aluminum die casting according to claim 2, characterized in that: The flipping bracket includes a horizontal section and connecting arms extending downward from both sides of the horizontal section. The connecting arms are used to connect to the flipping drive mechanism so that the bottom trolley body is driven by the flipping drive mechanism to flip.

4. The crucible bottom support for semi-solid slurry preparation in aluminum die casting according to claim 1, characterized in that: The tip includes an inclined drainage surface, the inclination angle of which ranges from 15 to 45°.

5. The crucible bottom support for semi-solid slurry preparation in aluminum die casting according to claim 1, characterized in that: The bottom wall is recessed inward in the middle, forming a central recessed portion and an outer annular convex edge.

6. The crucible bottom support for semi-solid slurry preparation in aluminum die casting according to claim 1, characterized in that: The two sides of the annular sidewall are integrally formed with connecting ears, and the outer end face of the connecting ears is provided with a mounting part, which is used to fix the clamping assembly for clamping the cylindrical crucible.

7. The crucible bottom support for semi-solid slurry preparation in aluminum die casting according to claim 6, characterized in that: The clamping assembly includes a cylinder and a clamping arm. The clamping arm includes a horizontal arm connected to the output end of the cylinder, a vertical arm connected to the outer end of the horizontal arm, and a plurality of clamping fingers extending laterally outward from the lower end of the vertical arm.

8. The crucible bottom support for semi-solid slurry preparation in aluminum die casting according to claim 7, characterized in that: Each of the clamping components includes two pressure fingers spaced apart from each other and located on opposite sides of the cylindrical crucible.

9. The crucible bottom support for semi-solid slurry preparation in aluminum die casting according to claim 8, characterized in that: The pressure finger is arc-shaped toward the inner wall of the cylindrical crucible to conform to the outer peripheral wall of the cylindrical crucible.

10. The crucible bottom support for semi-solid slurry preparation in aluminum die casting according to claim 5, characterized in that: The diameter of the cylindrical crucible is smaller than the diameter of the recessed portion; An annular rib is integrally formed on the outer peripheral wall of the lower section of the cylindrical crucible, and the distance between the lower surface of the annular rib and the bottom surface of the cylindrical crucible is greater than the height of the recess.

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