A negative pressure casting crystallizer

Abstract

The utility model discloses a negative pressure casting crystallizer, effectively solved the problem that the pore appears in aluminium bar, including the casing of embedding on the box, the inside of casing is equipped with through -hole, and the section of through -hole is equipped with the step, and the lower end of through -hole is equipped with the inner cover of sleeve, and the step is successively embedded and connected with the oil ring and the gas ring, and the upper end of through -hole is fixed with the adapter plate, and the middle part of adapter plate is equipped with the taper hole, and the bottom surface of adapter plate is the basin -like structure of low -lying in the middle four all around high, and the inside of adapter plate is equipped with annular air passage, and air passage links to each other negative pressure equipment, and the bottom of adapter plate is equipped with the air hole of intercommunication air passage, and the molten aluminium liquid flows from the upper end of adapter plate, and forms the aluminium bar in through -hole, and forms the negative pressure in the inside of inner cover, makes the molten aluminium liquid more smoothly enter the crystallizer, and the oil ring and the gas ring are connected with the oil supply and the gas supply pipeline respectively, and the aluminium bar forms the oil film and the gas film with the oil ring and the gas ring respectively, the utility model discloses ingenious structure, forms the negative pressure in the inside of crystallizer, makes the aluminium liquid smoothly enter, and discharges the gas in the inside of crystallizer, guarantees the casting quality of aluminium plate.

Description

Technical Field

[0001] This device relates to the field of casting equipment technology, and in particular to a negative pressure casting crystallizer. Background Technology

[0002] Oil-gas slip casting technology, applied to hot-top casting of aluminum alloy round ingots, offers advantages such as high casting speed, thin ingot shell, fine grain size, improved yield of subsequent deep processing, and shortened homogenization cycle time. Its environmental benefits include minimal oil consumption and reduced cooling water flow rate. It has become one of the most advanced aluminum alloy casting technologies in the world today.

[0003] In the actual casting process, due to the presence of high-pressure gas inside the crystallizer, defects such as porosity may occur in the aluminum rod, affecting product quality. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, this utility model provides a negative pressure casting crystallizer, which effectively solves the problem of porosity in aluminum rods.

[0005] The technical solution to the technical problem is as follows: a negative pressure casting crystallizer includes an outer sleeve embedded in a box body, an inner sleeve with a through hole in the middle of the through hole and an inner sleeve connected to the lower end of the through hole, an oil ring and a gas ring being embedded in sequence at the step, a transition plate fixed to the upper end of the through hole, a conical hole in the middle of the transition plate, a basin-shaped structure with a lower center and higher edges on the bottom surface of the transition plate, an annular gas channel inside the transition plate, the gas channel connecting to a negative pressure device, and a gas hole at the bottom of the transition plate connecting to the gas channel. Molten aluminum flows in from the upper end of the transition plate and forms an aluminum rod in the through hole. A negative pressure is formed inside the inner sleeve, which allows the molten aluminum to enter the crystallizer more smoothly. The oil ring and the gas ring are respectively connected to the oil supply and gas supply pipelines, and an oil film and a gas film are formed between the aluminum rod and the oil ring and the gas ring, respectively.

[0006] Preferably, the lower end of the step is provided with a positioning ring, the air ring is in contact with the positioning ring, the lower end of the positioning ring extends with a barb close to the aluminum rod, and the top of the inner sleeve is higher than the barb.

[0007] Preferably, the lower end of the adapter plate is higher than the connection point between the oil ring and the gas ring.

[0008] Preferably, the oil ring is fixed inside the outer sleeve by a fixing ring, and a groove is provided above the fixing ring, with the adapter plate fixed in the groove.

[0009] Preferably, a cover plate is connected above the fixing ring, and the cover plate fixes the adapter plate to the fixing ring.

[0010] Preferably, the inner hole of the oil ring has a tapered structure that is larger at the top and smaller at the bottom, and the inclination of the outer circle of the adapter plate is consistent with that of the inner hole of the oil ring.

[0011] Preferably, the outer side of the inner sleeve is provided with water holes for cooling.

[0012] Preferably, the adapter plate is provided with a connecting pipe above it, which connects the air passage to the negative pressure device. A baffle is rotatably provided at the bottom of the air hole. The lower end of the baffle is rotatably connected to the bottom of the adapter plate via a torsion spring. The torsion spring rotates the baffle upward. A spring pin is provided on the bottom side of the air hole, which corresponds to the movable end of the baffle. A spring is provided at the inner end of the spring pin. Under the action of the spring, the spring pin presses against the movable end of the baffle, so that the air hole is in the open state.

[0013] This invention features a clever structure that creates negative pressure inside the crystallizer, allowing molten aluminum to enter smoothly and expelling gas from the crystallizer, thus ensuring the quality of aluminum plate casting. Attached Figure Description

[0014] Figure 1 This is a cross-sectional schematic diagram of a negative pressure casting crystallizer after assembly according to this utility model.

[0015] Figure 2 This utility model relates to a negative pressure casting crystallizer. Figure 1 Enlarged schematic diagram of part A in the middle.

[0016] Figure 3 This is an exploded schematic diagram of a negative pressure casting crystallizer according to this utility model.

[0017] Figure 4 This is a schematic diagram of the structure of the adapter plate in a negative pressure casting crystallizer according to this utility model.

[0018] Figure 5 This is a cross-sectional view of the adapter plate in a negative pressure casting crystallizer according to this utility model.

[0019] Figure 6 This utility model relates to a negative pressure casting crystallizer. Figure 5 Schematic diagram of cross section of BB. Detailed Implementation

[0020] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0021] Depend on Figures 1 to 6It is known that a negative pressure casting crystallizer includes an outer sleeve 2 embedded in a housing 1. The outer sleeve 2 has a through hole inside, and a step 3 is provided in the middle section of the through hole. An inner sleeve 4 is connected to the lower end of the through hole. An oil ring 5 and a gas ring 6 are sequentially embedded at the step 3. A positioning ring 12 is provided at the lower end of the step 3. The gas ring 6 contacts the positioning ring 12. A barb 13 extends from the lower end of the positioning ring 12 and is close to the aluminum rod 11. The top of the inner sleeve 4 is higher than the barb 13. The inner sleeve 4 is inserted into the outer sleeve 2 from the lower end and is fixedly connected with screws. A transition plate 7 is fixed at the upper end of the through hole. The lower end of the transition plate 7 is higher than the connection between the oil ring 5 and the gas ring 6. A conical hole is provided in the middle of the transition plate 7. The inner hole of the oil ring 5 has a conical structure that is larger at the top and smaller at the bottom. The outer circle of the transition plate 7 and the inner hole of the oil ring 5 are inclined at the same angle. The oil ring 5 is fixed inside the outer sleeve 2 by the fixing ring 14. A groove 15 is provided above the fixing ring 14, and the adapter plate 7 is fixed in the groove 15. A cover plate 16 is connected above the fixing ring 14, and the cover plate 16 fixes the adapter plate 7 on the fixing ring 14. The bottom surface of the adapter plate 7 is a basin-shaped structure with a low center and high edges. The adapter plate 7 has an annular air passage 8 inside, which is connected to the negative pressure equipment. The bottom of the adapter plate 7 has an air hole 9 that connects to the air passage 8. Molten aluminum liquid 10 flows in from the upper end of the adapter plate 7 and forms an aluminum rod 11 in the through hole. A negative pressure is formed inside the inner sleeve 4, which makes the molten aluminum liquid 10 enter the crystallizer more smoothly. The oil ring 5 and the air ring 6 are connected to the oil supply and air supply pipelines respectively. An oil film and an air film are formed between the aluminum rod 11 and the oil ring 5 and the air ring 6 respectively.

[0022] In practical use, this utility model After processing to meet quality requirements, the molten aluminum 10 (690℃-710℃) enters the oil-air lubricated crystallizer through a distribution system. Following set process parameters, the molten aluminum 10 is cast into ingots of different sizes. During casting, lubricating oil and compressed air are introduced into the separately designed oil ring 5 and air ring 6, respectively. This results in uniformly distributed oil and air films, a thin segregation layer on the ingot surface, a smooth surface, and a significantly extended replacement cycle for the casting graphite ring. Simultaneously, due to the anti-overflow design of the adapter plate 7, the molten aluminum 10 within the crystallizer remains undisturbed and free of air bubbles during casting, avoiding quality defects caused by these issues.

[0023] During casting, the negative pressure device is connected to the annular air passage 8 through the connecting pipe 18, and the inner sleeve 4 is connected through multiple air holes 9. When the negative pressure device is activated, a negative pressure is generated inside the inner sleeve 4, which causes the aluminum liquid 10 to flow into the crystallizer quickly. The multiple air holes 9 are evenly distributed, which can quickly discharge excess gas inside the crystallizer, making the internal air pressure uniform and the aluminum liquid 10 flow more smoothly. When the height of the aluminum liquid 10 reaches the position of the air hole 9, it will block the air hole 9, and the casting is completed.

[0024] To achieve the closure of the air hole 9, a connecting pipe 18 is provided above the adapter plate 7. The connecting pipe 18 connects the air passage 8 and the negative pressure device. A baffle 19 is rotatably installed at the bottom of the air hole 9. The lower end of the baffle 19 is rotatably connected to the bottom of the adapter plate 7 via a torsion spring. The torsion spring rotates the baffle 19 upward. A spring pin 20 is provided on the bottom side of the air hole 9, corresponding to the movable end of the baffle 19. A spring 21 is provided at the inner end of the spring pin 20. Under the action of the spring 21, the spring pin 20 presses against the movable end of the baffle 19, so that the air hole 9 is in the open state.

[0025] In normal working condition, the elastic spring 21 pushes out to support the movable end of the baffle 19, so that the lower end of the adapter plate 7 is in the open state and can be connected with the negative pressure equipment, thereby creating a vacuum inside the inner sleeve 4 to form a negative pressure. When the aluminum liquid 10 rises to the position of the baffle 19, it will push the baffle 19 to compress the spring 21 and close the air hole 9.

[0026] The pore 9 is located at the bottom outer side of the adapter plate 7, at the highest point inside the crystallizer. It can continuously generate negative pressure inside the inner sleeve 4 and close after the aluminum rod 11 is formed, ensuring the smooth progress of the entire casting process.

[0027] Cooling water circulates inside the box 1 to cool the molten aluminum 10. Multiple crystallizers can be installed on the box 1 to enable simultaneous casting of multiple ingots. After casting is completed, the box 1 is flipped over to remove the ingots. Then, the crystallizers are cleaned before the next casting is carried out.

[0028] The crystallizer has two layers of cooling water holes 17 on the outer side of the inner sleeve 4. The enhanced cooling water technology makes the amount of cooling water used smaller than that of ordinary annular slit structure crystallizers.

[0029] Compared with the prior art, the present invention has the following advantages: by setting a negative pressure structure inside the crystallizer, a negative pressure can be formed during the casting process, which allows the aluminum liquid to enter the crystallizer more smoothly, thereby improving the quality of the aluminum rod and reducing quality defects.

Claims

1. A negative pressure casting crystallizer, characterized in that, Includes an outer sleeve (2) embedded in the housing (1), the outer sleeve (2) has a through hole inside, a step (3) in the middle of the through hole, an inner sleeve (4) connected to the lower end of the through hole, an oil ring (5) and an air ring (6) are embedded in the step (3) in sequence, an adapter plate (7) is fixed at the upper end of the through hole, the adapter plate (7) has a conical hole in the middle, the bottom surface of the adapter plate (7) is a basin-shaped structure with a low middle and high sides, and an annular air passage (8) is provided inside the adapter plate (7). (8) Connect the negative pressure device. The bottom of the adapter plate (7) is provided with a vent (9) for connecting the air passage (8). Molten aluminum liquid (10) flows in from the upper end of the adapter plate (7) and forms an aluminum rod (11) in the through hole. A negative pressure is formed inside the inner sleeve (4), so that the molten aluminum liquid (10) can enter the crystallizer more smoothly. The oil ring (5) and the gas ring (6) are connected to the oil supply and gas supply pipelines respectively. An oil film and a gas film are formed between the aluminum rod (11) and the oil ring (5) and the gas ring (6) respectively.

2. The negative pressure casting crystallizer according to claim 1, characterized in that, The step (3) is provided with a positioning ring (12) at the lower end. The air ring (6) is in contact with the positioning ring (12). The lower end of the positioning ring (12) has a barb (13) that extends close to the aluminum rod (11). The top of the inner sleeve (4) is higher than the barb (13).

3. The negative pressure casting crystallizer according to claim 1, characterized in that, The lower end of the adapter plate (7) is higher than the connection between the oil ring (5) and the gas ring (6).

4. The negative pressure casting crystallizer according to claim 1, characterized in that, The oil ring (5) is fixed inside the outer sleeve (2) by the fixing ring (14), and a groove (15) is provided above the fixing ring (14), and the adapter plate (7) is fixed inside the groove (15).

5. A negative pressure casting crystallizer according to claim 4, characterized in that, A cover plate (16) is connected above the fixing ring (14), and the cover plate (16) fixes the adapter plate (7) on the fixing ring (14).

6. A negative pressure casting crystallizer according to claim 1, characterized in that, The inner hole of the oil ring (5) is a tapered structure with a larger upper part and a smaller lower part, and the inclination of the outer circle of the adapter plate (7) is consistent with that of the inner hole of the oil ring (5).

7. A negative pressure casting crystallizer according to claim 1, characterized in that, The inner sleeve (4) is provided with water holes (17) for cooling on the outside.

8. A negative pressure casting crystallizer according to claim 1, characterized in that, The adapter plate (7) is provided with a connecting pipe (18) above it. The connecting pipe (18) connects the air passage (8) and the negative pressure device. A baffle (19) is rotatably provided at the bottom of the air hole (9). The lower end of the baffle (19) is rotatably connected to the bottom of the adapter plate (7) via a torsion spring. The torsion spring rotates the baffle (19) upward. A spring pin (20) is provided on the bottom side of the air hole (9) corresponding to the movable end of the baffle (19). A spring (21) is provided at the inner end of the spring pin (20). The spring pin (20) presses against the movable end of the baffle (19) under the action of the spring (21), so that the air hole (9) is in the open state.

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