Air cooling mechanism for aluminum ingot grain refinement

Abstract

The utility model provides an air cooling mechanism for aluminum ingot grain refinement, and relates to the technical field of grain refinement. A water cooling mechanism and an electromagnetic stirring mechanism are arranged on the lower portion of the forming groove, a sealing cover is connected with the forming groove in a covering mode, matched sealing check rings are arranged on the edge of the top of the forming groove and the edge of the bottom of the sealing cover respectively, a second air inlet pipe and a second air outlet pipe are communicated with the sealing cover, and the second air inlet pipe and the second air outlet pipe are communicated with a cold air unit. And nitrogen circularly flows in the cold air unit and the sealing cover. Impurities and oxygen are prevented from being mixed into molten aluminum in the air cooling process.

Description

Technical Field

[0001] The utility model relates to the technical field of grain refinement, in particular to an air cooling mechanism for grain refinement of aluminum ingots. Background Art

[0002] The ideal ingot structure is a uniform and fine equiaxed crystal on the entire cross section of the ingot. This is because equiaxed crystals have small anisotropy, uniform deformation during processing, excellent performance, good plasticity, and are conducive to casting and subsequent plastic processing. To obtain this structure, the melt is usually required to be refined. Any treatment that can promote nucleation and inhibit grain growth can refine the grains. The cooling efficiency has a significant effect on the grain refinement effect. In the process of cooling the aluminum liquid to the aluminum ingot, improving the cooling efficiency can help improve the grain refinement effect.

[0003] In the prior art, in order to improve cooling efficiency, water cooling and air cooling are generally combined. Air cooling is generally achieved by fan-induced air. This cooling method allows the aluminum liquid to directly contact the outside air. The impurities and oxygen in the outside air affect the quality of the aluminum liquid, which urgently needs to be solved. Utility Model Content

[0004] The utility model aims to develop an air cooling mechanism for aluminum ingot grain refinement, which can prevent aluminum liquid from mixing with impurities and oxygen during the air cooling process.

[0005] The utility model is achieved through the following technical solutions:

[0006] An air cooling mechanism for aluminum ingot grain refinement, comprising:

[0007] A forming tank, the lower part of which is provided with a water cooling mechanism and an electromagnetic stirring mechanism;

[0008] A sealing cover connected to the molding groove cover;

[0009] Among them, the top edge of the forming groove and the bottom edge of the sealing cover are respectively provided with matching sealing rings, and the sealing cover is connected with a second air inlet pipe and a second air outlet pipe, the second air inlet pipe and the second air outlet pipe are connected with a cold air unit, and nitrogen circulates in the cold air unit and the sealing cover.

[0010] Optionally, a partition component is provided in the enclosure, the upper part of the partition component in the enclosure is an upper cavity, and the lower part of the partition component in the enclosure is a lower cavity, and the second air inlet pipe and the second air outlet pipe are connected to the upper cavity.

[0011] Optionally, a first air inlet pipe and a first air outlet pipe are connected to the sealing cover on the side of the lower cavity, and the first air inlet pipe and the first air outlet pipe are both provided with solenoid valves, and the first air inlet pipe is connected to the cold air unit.

[0012] Optionally, the partition assembly includes a retaining ring arranged along the inner wall of the sealing cover, a sealing plate is provided in the sealing cover above the retaining ring, the edge of the sealing plate is in sliding contact with the inner wall of the sealing cover of the upper cavity, a sealing gasket is provided on the bottom edge of the sealing plate and the top of the retaining ring, an electric push rod is vertically provided on the top of the sealing cover, the electric push rod is connected to the sealing plate, and the second air inlet pipe and the second air outlet pipe are located at the lower part of the maximum upward stroke of the sealing plate.

[0013] Optionally, the cold air unit includes a filter assembly, a cooling assembly and a detection assembly connected in sequence, the second air outlet pipe is connected to the filter assembly, the first air inlet pipe and the second air inlet pipe are connected to the detection assembly, and a circulation pump is provided between the filter assembly and the cooling assembly.

[0014] Optionally, the second air outlet pipe is connected to an air supply pipe, and the air supply pipe is provided with a solenoid valve.

[0015] Optionally, the detection component includes a detection box, in which an air pressure sensor, a dust sensor and a temperature sensor are arranged.

[0016] Optionally, the filter assembly includes a filter box, in which a plurality of air filter layers are arranged, and the filter apertures of the plurality of air filter layers in the filter box decrease sequentially in the airflow direction.

[0017] Optionally, the cooling component can be any one or more combinations of a plate heat exchanger, a fin-tube heat exchanger, and a shell-and-tube heat exchanger, and multiple groups of heat exchangers are connected in series in sequence when combined.

[0018] The beneficial effects of the utility model are:

[0019] In the cooling process of aluminum liquid of the utility model, cooling is combined with electromagnetic stirring to jointly realize grain refinement, air cooling is combined with water cooling, and temperature control is realized by adjusting the circulation speed of air cooling, and the cooling efficiency is high, which effectively promotes grain refinement. The air cooling mechanism adopts dry and clean nitrogen in a closed space as the cooling medium to prevent oxygen and impurities from entering the aluminum liquid and maintain the purity and quality of the aluminum. The sealing plate arranged cooperates with the first air inlet pipe and the first air outlet pipe to purge and replace the air in the forming tank to prevent oxygen from remaining in the forming tank. The sealing plate can be raised and lowered to realize the air cooling mechanism. The internal sealing of the structure prevents the entry of external air impurities and contamination of the internal nitrogen, and the nitrogen can be recycled. Each time air cooling is performed, it is only necessary to replenish the nitrogen used for purging and air replacement through the air supply pipe. The amount of nitrogen used is small. The set temperature sensor cooperates with the circulation pump to adjust the nitrogen circulation speed and the air cooling efficiency. The set air pressure sensor and dust sensor will alarm when nitrogen leaks or is mixed with impurities, so as to promptly remind the airtightness of the sealed space inside the air cooling mechanism to be damaged, and timely inspection and maintenance should be carried out to avoid affecting the quality of aluminum ingots. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a structural diagram of the utility model;

[0022] Figure 2 This is the structural diagram of the enclosure and cold air unit.

[0023] Figure numerals: 100, forming groove; 201, first air inlet pipe; 202, first air outlet pipe; 203, second air inlet pipe; 204, second air outlet pipe; 205, sealing cover; 206, sealing plate; 207, retaining ring; 208, electric push rod; 209, filtering assembly; 210, circulating pump; 211, cooling assembly; 212, detection assembly. DETAILED DESCRIPTION

[0024] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0026] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0027] like Figure 1 and Figure 2As shown, the utility model discloses an air cooling mechanism for grain refinement of aluminum ingots, including a forming tank 100, a water cooling mechanism and an electromagnetic stirring mechanism (not shown in the figure) are arranged at the lower part of the forming tank 100, a sealing cover 205 is arranged at the upper part of the forming tank 100, and the sealing cover 205 is driven to move by a driving device (not shown in the figure), and the top edge of the forming tank 100 and the bottom edge of the sealing cover 205 are respectively provided with matching sealing retaining rings, so that the internal space is sealed after the sealing cover 205 is covered on the forming tank 100. A partition component is arranged in the sealing cover 205, and the upper part of the partition component in the sealing cover 205 is the upper cavity, and the lower part is the lower cavity.

[0028] The partition assembly includes a retaining ring 207 arranged along the inner wall of the sealing cover 205, a sealing plate 206 is arranged in the sealing cover 205 above the retaining ring 207, the edge of the sealing plate 206 is in sliding contact with the inner wall of the sealing cover 205 of the upper cavity, and a layer of sealing gasket is arranged on the bottom edge of the sealing plate 206 and the top of the retaining ring 207. An electric push rod 208 is vertically arranged on the top of the sealing cover 205, and the electric push rod 208 is connected to the sealing plate 206. The electric push rod 208 drives the sealing plate 206 to rise and fall vertically in the upper cavity, and the sealing plate 206 contacts the retaining ring 207 to seal the upper cavity.

[0029] The sealing cover 205 on the side of the lower cavity is connected with the first air inlet pipe 201 and the first air outlet pipe 202, and the first air inlet pipe 201 and the first air outlet pipe 202 are both provided with solenoid valves, and the sealing cover 205 on the side of the upper cavity is connected with the second air inlet pipe 203 and the second air outlet pipe 204, the second air inlet pipe 203 and the second air outlet pipe 204 are at the lower part of the maximum upward stroke of the sealing plate 206, that is, when the sealing plate 206 slides up to the maximum stroke, the second air inlet pipe 203 and the second air outlet pipe 204 are below the sealing plate 206, the first air inlet pipe 201, the second air inlet pipe 203, and the second air outlet pipe 204 are connected to the cold air unit, and the first air outlet pipe 202 is connected to the outside.

[0030] The cold air unit includes a filter component 209, a cooling component 211 and a detection component 212 which are connected in sequence. The second air outlet pipe 204 is connected to the filter component 209. The second air outlet pipe 204 is also connected to an air supply pipe, on which a solenoid valve is provided. The first air inlet pipe 201 and the second air inlet pipe 203 are connected to the detection component 212. A circulating pump 210 is provided between the filter component 209 and the cooling component 211.

[0031] The filter assembly 209 includes a filter box, in which multiple air filter layers are arranged. The filter apertures of the multiple air filter layers in the filter box decrease successively in the direction of the airflow, first filtering out impurities with larger particle sizes in the airflow, and then filtering out impurities with smaller particle sizes, thereby achieving graded filtration.

[0032] The cooling component 211 can be any one or more combinations of heat exchangers such as plate heat exchangers, fin-tube heat exchangers, shell and tube heat exchangers, etc. When multiple groups of heat exchangers are combined, they are connected in series in sequence. The cooling component 211 exchanges heat and cools the airflow output by the filter component 209. During this process, the cooling component 211 remains sealed from the outside world.

[0033] The detection component 212 includes a detection box, in which an air pressure sensor, a dust sensor and a temperature sensor are arranged. The cold air flow output by the cooling component 211 enters the detection component 212 .

[0034] The driving device drives the sealing cover 205 to cover the molding groove 100. After the sealing cover 205 is connected with the molding groove 100, it is sealed from the outside. Before the sealing cover 205 is connected with the molding groove 100, the sealing plate 206 in the sealing cover 205 is in contact with the baffle ring 207. At this time, the upper cavity and the cold air unit form an enclosed space, and the internal space is filled with nitrogen and the air pressure is greater than that of the outside. After the sealing cover 205 is connected to the molding tank 100, the lower cavity in the sealing cover 205 and the molding tank 100 form a space, the circulating pump 210 is running, the electromagnetic valves on the first air inlet pipe 201, the first air outlet pipe 202 and the air supply pipe are opened, and the air supply pipe injects dry and clean nitrogen into the second air outlet pipe 204. Since the air pressure in the enclosed space formed by the upper cavity and the cold air unit is greater than that in the outside, the nitrogen in the enclosed space enters the lower cavity and the molding tank 100 through the first air inlet pipe 201, and the nitrogen and air in the lower cavity are discharged through the first air outlet pipe 202, so as to realize the purging and air replacement of the lower cavity and the molding tank 100, and finally fill the lower cavity and the molding tank 100 with nitrogen, and then the electromagnetic valve of the first air outlet pipe 202 is closed, and the air pressure sensor in the detection box detects the air pressure. After reaching a certain value, the solenoid valve on the air supply pipe is closed, and the electric push rod 208 drives the sealing plate 206 to rise to the maximum stroke. The second air inlet pipe 203 and the second air outlet pipe 204 are located below the sealing plate 206 so that they are connected to the lower cavity and the molding tank 100, and the circulating pump 210 continues to operate. The airflow in the lower cavity and the molding tank 100 exchanges heat with the aluminum liquid and passes through the filter component 209, the circulating pump 210, the cooling component 211, and the detection component 212 in turn, and then enters the lower cavity and the molding tank 100 through the first air inlet pipe 201 and the second air inlet pipe 203. The filter component 209 can filter out impurities that may exist in the nitrogen flow, the cooling component 211 cools down the nitrogen flow after heat exchange with the aluminum liquid, and the detection component 212 monitors the air pressure, temperature and cleanliness of the nitrogen flow.

[0035] In order to avoid the aluminum liquid from cooling too fast in the early stage of cooling, the operation of the circulation pump 210 is carried out according to the air flow temperature monitored by the temperature sensor in the detection box. When the air flow temperature is lower than a certain range, the air temperature at this time may cause the aluminum liquid surface in the forming tank 100 to cool too fast, resulting in uneven cooling of the aluminum liquid surface and the lower part. At this time, the circulation pump 210 is operated at a reduced speed, the air flow circulation speed is slowed down, and the heat exchange of the nitrogen flow to the aluminum liquid is reduced. On the contrary, if the air temperature is higher than a certain range, the air temperature at this time may cause the aluminum liquid surface in the forming tank 100 to cool slowly, resulting in uneven cooling of the aluminum liquid surface and the lower part. At this time, the circulation pump 210 is operated at a faster speed to increase the heat exchange of the nitrogen flow to the aluminum liquid. After the aluminum liquid solidifies, the circulation pump 210 can be operated at a high speed to improve the heat exchange efficiency of the nitrogen flow to the aluminum liquid. After the air cooling is completed, the electric push rod 208 drives the sealing plate 206 to descend until it contacts the baffle ring 207, and the solenoid valve of the first air inlet pipe 201 is closed. At this time, the upper cavity and the cold air unit form a closed space, and the outside air and impurities cannot enter. The driving device drives the sealing cover 205 to slide away from the molding tank 100, and the sealing cover 205 waits for the next air cooling operation. During this process, if the air pressure detected by the air pressure sensor in the detection box drops, the closed space formed by the upper cavity and the cold air unit leaks, and nitrogen escapes, and the air cooling mechanism needs to be repaired and maintained. In the air cooling mechanism, the cold air unit can be fixedly set, and the pipeline between the cold air unit and the sealing cover 205 is a hose.

[0036] In the cooling process of aluminum liquid of the utility model, cooling is combined with electromagnetic stirring to jointly realize grain refinement, air cooling is combined with water cooling, and temperature control is realized by adjusting the circulation speed of air cooling, and the cooling efficiency is high, which effectively promotes grain refinement. The air cooling mechanism uses dry and clean nitrogen in a closed space as a cooling medium to prevent oxygen and impurities from entering the aluminum liquid and maintain the purity and quality of the aluminum. The sealing plate 206 is arranged to cooperate with the first air inlet pipe 201 and the first air outlet pipe 202 to purge and replace the air in the molding tank 100 to prevent oxygen from remaining in the molding tank 100. The sealing plate 206 The air cooling mechanism can be raised and lowered to seal the inside, preventing outside air impurities from entering and contaminating the internal nitrogen, and the nitrogen can be recycled. Each time air cooling is performed, it is only necessary to replenish the nitrogen used for purging and air replacement through the air supply pipe. The amount of nitrogen used is small. The set temperature sensor cooperates with the circulation pump 210 to adjust the nitrogen circulation speed and the air cooling efficiency. The set air pressure sensor and dust sensor will alarm when nitrogen leaks or impurities are mixed in, so as to promptly remind the airtightness of the sealed space inside the air cooling mechanism to be damaged, and timely inspection and maintenance should be carried out to avoid affecting the quality of the aluminum ingots.

[0037] The above embodiments are only preferred embodiments of the present utility model and are not limitations on the technical solutions of the present utility model. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present utility model.

Claims

1. An air cooling mechanism for grain refinement of aluminum ingots, characterized in that: include: A forming tank, the lower part of which is provided with a water cooling mechanism and an electromagnetic stirring mechanism; A sealing cover connected to the molding groove cover; Among them, the top edge of the forming groove and the bottom edge of the sealing cover are respectively provided with matching sealing rings, and the sealing cover is connected with a second air inlet pipe and a second air outlet pipe, the second air inlet pipe and the second air outlet pipe are connected with a cold air unit, and nitrogen circulates in the cold air unit and the sealing cover.

2. The air cooling mechanism for grain refinement of aluminum ingots according to claim 1 is characterized in that: A partition component is provided in the enclosure, the upper part of the partition component in the enclosure is an upper cavity, and the lower part of the partition component in the enclosure is a lower cavity, and the second air inlet pipe and the second air outlet pipe are connected to the upper cavity.

3. The air cooling mechanism for grain refinement of aluminum ingots according to claim 2, characterized in that: A first air inlet pipe and a first air outlet pipe are connected to the sealing cover on the side of the lower cavity. The first air inlet pipe and the first air outlet pipe are both provided with solenoid valves. The first air inlet pipe is connected to the cold air unit.

4. The air cooling mechanism for grain refinement of aluminum ingots according to claim 3 is characterized in that: The partition assembly includes a retaining ring arranged along the inner wall of the sealing cover, a sealing plate is provided in the sealing cover above the retaining ring, the edge of the sealing plate is in sliding contact with the inner wall of the sealing cover of the upper cavity, a sealing gasket is provided at the bottom edge of the sealing plate and the top of the retaining ring, an electric push rod is vertically provided on the top of the sealing cover, the electric push rod is connected to the sealing plate, and the second air inlet pipe and the second air outlet pipe are located at the lower part of the maximum upward stroke of the sealing plate.

5. The air cooling mechanism for grain refinement of aluminum ingots according to claim 4, characterized in that: The cold air unit includes a filter assembly, a cooling assembly and a detection assembly which are connected in sequence. The second air outlet pipe is connected to the filter assembly, the first air inlet pipe and the second air inlet pipe are connected to the detection assembly, and a circulation pump is provided between the filter assembly and the cooling assembly.

6. The air cooling mechanism for grain refinement of aluminum ingots according to claim 5, characterized in that: The second air outlet pipe is connected with an air supply pipe, and the air supply pipe is provided with a solenoid valve.

7. The air cooling mechanism for grain refinement of aluminum ingots according to claim 5, characterized in that: The detection component comprises a detection box, in which an air pressure sensor, a dust sensor and a temperature sensor are arranged.

8. The air cooling mechanism for grain refinement of aluminum ingots according to claim 5, characterized in that: The filter assembly comprises a filter box, in which a plurality of air filter layers are arranged, and the filter apertures of the plurality of air filter layers in the filter box decrease sequentially in the air flow direction.

9. The air cooling mechanism for grain refinement of aluminum ingots according to claim 5, characterized in that: The cooling assembly can be any one or more combinations of a plate heat exchanger, a fin-tube heat exchanger, and a shell-and-tube heat exchanger, and multiple groups of heat exchangers are connected in series in sequence.

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