CN114438364A - Preparation method of foamed aluminum wave-absorbing material and special air cooling and spraying device - Google Patents
Preparation method of foamed aluminum wave-absorbing material and special air cooling and spraying device Download PDFInfo
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- CN114438364A CN114438364A CN202210228030.2A CN202210228030A CN114438364A CN 114438364 A CN114438364 A CN 114438364A CN 202210228030 A CN202210228030 A CN 202210228030A CN 114438364 A CN114438364 A CN 114438364A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/08—Alloys with open or closed pores
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/08—Alloys with open or closed pores
- C22C1/083—Foaming process in molten metal other than by powder metallurgy
- C22C1/086—Gas foaming process
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
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Abstract
The invention discloses a preparation method of a foamed aluminum wave-absorbing material and a special air cooling and spraying device, wherein the preparation method comprises the following steps: the aluminum melt is prepared by melting pure aluminum or aluminum-silicon alloy, and comprises the steps of stirring, tackifying, cooling, foaming and cooling, wherein the components comprise, by mass, 58-62% of the aluminum melt, 4-6% of the tackifier, 18-22% of the coolant and 15-18% of the foaming agent. The tackifier is elemental calcium which is more than or equal to 95 percent; the coolant is magnetic powder made of ferrite with the grain diameter of 300 meshes to 400 meshes; the foaming agent is made of TiO2And TiH2The weight ratio of the components is 9: 1. The special air cooling and spraying device comprises: the stirrer component is arranged on one side of the base; the 1 fan is arranged on the base and positioned below the stirring tank; a cooling component arranged at the other side of the base and comprising a cooling box, a cooling tank, a water delivery pipe, a plurality of atomizing nozzles andthe water pump, set up at cooling bath upper portion slidable heat preservation lid and heat preservation lid slide rail.
Description
Technical Field
The invention relates to the technical field of foamed aluminum material preparation, in particular to a preparation method of a foamed aluminum wave-absorbing material and an air cooling and spraying device in the preparation process.
Background
With the wide application of the electromagnetic wave technology, the technology brings progress to social development and people's life, and simultaneously causes very serious problems of electromagnetic pollution and electromagnetic interference, which can cause adverse effects on physical and mental health of people and safe and reliable use of equipment, airplane aviation can stop flying or delay due to electromagnetic wave interference, and mobile phones can interfere normal work of medical instruments. In order to eliminate the influence caused by electromagnetic waves, the electromagnetic wave absorbing material receives more and more attention, the wave absorbing material can absorb and attenuate incident electromagnetic waves and convert the electromagnetic waves into heat to be attenuated or make the electromagnetic waves disappear due to interference, the wave absorbing material is an important and effective means for solving the problem of electromagnetic pollution, and the development of the efficient and light electromagnetic wave absorbing material becomes the research focus of the existing wave absorbing material and the development direction of the future.
The wave-absorbing material should have impedance matching and attenuation characteristics, and in order to achieve effective absorption of electromagnetic waves, the electromagnetic waves should enter the material as much as possible in the process of space transmission to reduce reflection at an interface, so that the material is required to have good impedance matching, and whether the matching is carried out depends on whether the impedance of the material is close to the impedance of air. The attenuation characteristic is the attenuation capability of electromagnetic waves after entering the material, and is expressed by converting battery waves entering the material into heat or energy in other forms, so that the material is required to have stronger electromagnetic loss capability.
Because the pores of the foamed aluminum material are filled with air media, the intrinsic impedance of the material is close to the air impedance, and the impedance matching is easy to realize, which is the premise that the foamed aluminum material is used in the wave-absorbing field. When electromagnetic waves enter the foamed aluminum, the electromagnetic waves are consumed on the foam wall through continuous reflection, however, at present, the foamed aluminum mainly takes pure aluminum and aluminum alloy as matrixes, and the components have no loss performance, so that the foamed aluminum only has electromagnetic loss through the structure, and the loss performance is limited. In addition, the melt foaming method generally comprises a tackifying process, a cooling foaming process and a cooling process, compared with common foamed aluminum, if materials except pure aluminum and aluminum alloy are added, a serious segregation phenomenon may occur, and a proper cooling and cooling means is needed to prevent the occurrence of the segregation condition.
Disclosure of Invention
The invention aims to provide a preparation method of foamed aluminum with low volume density and stronger electromagnetic loss performance in components and an air cooling and spraying device special for the preparation method.
The invention relates to a preparation method of a foamed aluminum wave-absorbing material, which adopts the technical scheme that the foamed aluminum wave-absorbing material comprises 58-62% of aluminum melt, 4-6% of tackifier, 18-22% of coolant and 15-18% of foaming agent by mass percent, wherein the aluminum melt is prepared by melting pure aluminum or aluminum-silicon alloy, and is characterized in that the preparation process comprises the following steps:
step A, stirring and tackifying: adding the aluminum melt with the temperature of 670-;
step B, cooling and foaming: adding a coolant into the stirred and tackified melt in proportion for rapid cooling, starting the air cooling function of a special air cooling and spraying device, slowly cooling the melt to 650-660 ℃, stirring at a speed of 590-610r/min, adding a foaming agent, stirring for 5-7min, and pouring into a cooling tank;
step C, cooling: the upper part of the cooling tank is covered by a heat-insulating cover, the spraying function of a special air cooling and spraying device is started, water mist is sprayed to the bottom of the cooling tank, and the temperature of the spraying water is controlled to be 70-90 ℃ so that the melt in the cooling tank is slowly solidified layer by layer.
In a preferable embodiment of the preparation method of the foamed aluminum wave-absorbing material, the tackifier is elemental calcium, and the content of the elemental calcium is more than or equal to 95 percent;
in a preferred embodiment of the preparation method of the foamed aluminum wave-absorbing material, the coolant is magnetic powder made of ferrite with the grain diameter of 300-400 meshes.
Further, the ferrite is one or a combination of manganese zinc ferrite or nickel zinc ferrite.
In a preferred embodiment of the preparation method of the foamed aluminum wave-absorbing material, the foaming agent is TiO2And TiH2The weight ratio of the components is 9: 1.
Further, the foaming agent is a rolling ball milling coating foaming agent.
The invention relates to a special air cooling and spraying device for preparing a foamed aluminum wave-absorbing material, which adopts the technical scheme that the special air cooling and spraying device comprises: 1 base; the stirrer component is arranged on one side of the base and comprises a support arranged on the base, a stirring tank positioned above the support, a turbine worm transmission device arranged on the support and used for driving the stirring tank to rotate, a stirrer arranged in the stirring tank, a stirrer motor arranged above the stirrer and used for driving the stirrer through a long shaft, and a hydraulic lifting device arranged on one side of the stirring tank and used for driving the stirrer shaft and the stirrer to move up and down, wherein the tank wall of the stirring tank is of an inner-layer hollow structure, an air inlet port is formed in the bottom of the outer-layer tank wall of the stirring tank, and a plurality of air outlets are formed in the side surface of the outer-layer tank wall; the device comprises a base, a stirring tank, 1 fan, an air pipe, a fan outlet, a fan inlet port, a fan outlet and a fan outlet, wherein the fan outlet is arranged on the base and is positioned below the stirring tank; the cooling assembly arranged on the other side of the base comprises a cooling box arranged on the base, a cooling tank arranged on the upper portion of the cooling box, a water delivery pipe arranged between the cooling box and the cooling box, a plurality of atomizing nozzles arranged on the water delivery pipe and used for spraying water to the bottom of the cooling tank, a water pump connected with an external water source and the water delivery pipe, a slidable heat-insulating cover arranged on the upper portion of the cooling tank and a heat-insulating cover sliding rail on which the heat-insulating cover can move.
The invention discloses a special air cooling and spraying device prepared from a foamed aluminum wave-absorbing material.
The invention relates to a special air cooling and spraying device prepared from a foamed aluminum wave-absorbing material.
A preferable embodiment of the special air cooling and spraying device prepared from the foamed aluminum wave-absorbing material is that universal rollers are arranged at four corners of the bottom of the base, and self-locking devices are arranged in the universal rollers.
Compared with the prior art, the invention has the following beneficial effects: the cooling agent is one or a composition of ferrite, namely manganese zinc ferrite or nickel zinc ferrite, and the ferrite is prepared into magnetic powder with the grain diameter of 300 meshes to 400 meshes and added into the stirred aluminum melt, on one hand, the ferrite as the cooling agent can effectively cool the foamed aluminum melt; on the other hand, the magnetic particles as fine ferrite can be uniformly dispersed in an aluminum matrix, the electromagnetic wave loss and the reflection loss of the foamed aluminum plate prepared by the method are obviously increased, and the wave absorbing capacity is obviously improved. Particularly, the powdered ferrite is ground into fine powder without high-temperature melting and then directly added into the melt, so that the powdered ferrite not only serves as a coolant but also is fused with an aluminum matrix to form an embedded phase, and the production cost can be greatly reduced.
Accurate cooling can be realized through special air cooling and the matching of a spraying device and the foaming agent, the using effect of the foaming agent can be effectively promoted through the air cooling function, and the preparation of the low-density foamed aluminum is realized. In the cooling process, the upper part of the cooling tank is covered with the heat preservation bottom to form the atomizing nozzle, the water spraying function can ensure that the melt in the cooling tank is directionally solidified layer by layer, and the segregation phenomenon is reduced to enable the foam aluminum component to be more uniform. The special air cooling and spraying device has multiple purposes, can control air cooling and spraying in a centralized manner, can control water temperature, and has small occupied area and convenient operation.
Drawings
FIG. 1 is a schematic view of the overall structure of a dedicated apparatus for preparing foamed aluminum material in accordance with the present invention;
FIG. 2 is an enlarged schematic view of section A-A of FIG. 1;
fig. 3 is a graph of the reflection loss ratio of foamed aluminum.
The reference numbers in the figures denote: 1-base, 2-stirrer component, 3-fan, 4-cooling component, 5-worm gear transmission device, 11-universal roller, 21-support, 22-stirring tank, 23-stirrer, 24-long shaft, 25-stirrer motor, 26-lifting device, 27-air inlet port, 28-air outlet, 31-air pipe, 41-cooling box, 42-cooling tank, 43-water pipe, 44-atomizing nozzle, 45-water pump, 46-heat preservation cover, 47-heat preservation cover slide rail, 48-support plate, 49-electric heating wire, 51-sector turbine, 52-worm, 53-worm driving motor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The foamed aluminum wave-absorbing material is prepared by the following components, by mass, 58-62% of an aluminum melt, 4-6% of a tackifier, 18-22% of a coolant and 15-18% of a foaming agent, wherein the aluminum melt is prepared by melting pure aluminum or aluminum-silicon alloy, and the preparation process comprises the following steps:
step A, stirring and tackifying: adding the aluminum melt with the temperature of 670-;
step B, cooling and foaming: adding coolant into the stirred and tackified melt in proportion for rapid cooling, and openingThe special air cooling and air cooling function of the spraying device slowly cools the melt to 650-; the foaming agent can be a rolling ball milling coated foaming agent and is prepared from TiO2And TiH2According to the mass ratio of 9: 1;
step C, cooling: the upper part of the cooling tank is covered by a heat-insulating cover, the spraying function of a special air cooling and spraying device is started, water mist is sprayed to the bottom of the cooling tank, and the temperature of the spraying water is controlled to be 70-90 ℃ so that the melt in the cooling tank is slowly solidified layer by layer.
Referring to fig. 1-2, the special air cooling and spraying device for preparing the foamed aluminum wave-absorbing material in steps B and C includes:
four corners of base 1 bottom all install and have self-lock device universal gyro wheel 11, set up agitator assembly 2 in base one side, and agitator assembly sets up agitator tank 22 above the support including setting up support 21 above the base, the jar wall of agitator tank is inlayer and skin, is the cavity layer between inlayer and the skin that the jar wall includes inlayer and skin, and the outer jar wall bottom of agitator tank is equipped with air inlet port 27, is equipped with a plurality of air outlets 28 on the outer jar wall side, and the air outlet can be two-layer about for, every layer of 3 air outlets. A worm and gear transmission device 5 for driving the stirring tank to rotate is arranged on the bracket, a fan-shaped worm wheel 51 of the worm and gear transmission device is fixed at the bottom of the stirring tank, and a worm driving motor 53 is connected with a worm 52 fixed on the bracket to drive the fan-shaped worm wheel. The stirrer 23 is arranged in the stirring tank, stirring blades are arranged on the stirrer, a stirrer motor 25 above the stirrer drives the stirrer through a long shaft 24, a hydraulic lifting device 26 is arranged on one side of the stirring tank, and the hydraulic oil cylinder drives the lifting device to move up and down so as to drive the stirrer shaft and the stirrer to move up and down. A fan 3 is arranged above the base and below the stirring tank, the outlet of the fan is connected with one end of an air pipe 31, and the other end of the air pipe is connected with an air inlet port of the stirring tank; the cooling and cooling assembly 4 is arranged on the other side of the base and comprises a cooling box 41 arranged on the base, a plurality of supporting plates 48 used for supporting a cooling groove are arranged on opposite side walls inside the cooling box, the cooling groove 42 is arranged on the supporting plate on the upper portion of the cooling box, an electric heating wire 49 can be arranged at the bottom of the cooling box, a water conveying pipe 43 is arranged between the cooling box and the cooling box, a plurality of atomizing nozzles 44 for spraying water to the bottom of the cooling groove and a water pump 45 for connecting an external water source and the water conveying pipe are arranged on the water conveying pipe, a heat-insulating cover 46 capable of sliding to cover the cooling groove is arranged on the upper portion of the cooling groove, and a heat-insulating cover sliding rail 47 capable of enabling the heat-insulating cover to move on the heat-insulating cover is arranged below the heat-insulating cover. The stirrer, the worm and gear transmission device, the fan, the water pump, the atomizing nozzle and the electric heating wire can be controlled to work by 1 PLC controller.
When the stirring mechanism works, the stirring mechanism drives the stirrer to stir the aluminum melt material through the motor, and the coolant is introduced to carry out preliminary rapid cooling; meanwhile, the bottom in the cooling mechanism is provided with the atomizing nozzle which moves back and forth, the temperature of the electric heating wire can be used for adjusting and controlling the cooling speed, and the upper part is provided with the heat-insulating cover, so that the melt material can be uniformly cooled in a gradient manner from bottom to top, and the directional solidification is realized to ensure the consistency of the performance.
Example 1
The aluminum melt is prepared by melting pure aluminum or aluminum-silicon alloy, and the preparation process comprises the following steps:
step A, stirring and tackifying: adding the aluminum melt with the temperature of 670 ℃ and the tackifier into a stirrer in proportion, and stirring for 20min to increase the viscosity, wherein the tackifier is elemental calcium with the content of more than or equal to 95%;
step B, cooling and foaming: adding a coolant into the stirred and tackified melt in proportion for rapid cooling, starting the air cooling function of a special air cooling and spraying device, slowly cooling the melt to 650 ℃, stirring at a rotating speed of 590r/min, adding a foaming agent, stirring for 5min, pouring into a cooling tank, wherein the coolant is magnetic powder prepared from manganese-zinc ferrite with a particle size of 300 meshes, and the foaming agent is TiO2And TiH2Rolling ball milling coating foaming agent is formed according to the mass ratio of 9: 1;
step C, cooling: the upper part of the cooling tank is covered by a heat-insulating cover, the spraying function of a special air cooling and spraying device is started, water mist is sprayed to the bottom of the cooling tank, and the temperature of the spraying water is controlled at 70 ℃ to slowly solidify the melt in the cooling tank layer by layer.
The volume density of the wave-absorbing foamed aluminum prepared by the method is 0.21g/cm3Cutting foamed aluminum into a plate with the thickness of 15mm as a sample plate, and directly measuring the wave-absorbing property of the panel in the frequency range of 2-18GHz by using an arch method. The test system consists of an arch device, a signal source and a vector network analyzer, and calculates the wave-absorbing performance (RL) of the material according to the power of incident electromagnetic waves and reflected electromagnetic waves.
Example 2
The aluminum alloy comprises, by mass, 60% of an aluminum melt, 5% of a tackifier, 20% of a coolant and 16% of a foaming agent, wherein the aluminum melt is prepared by melting pure aluminum or aluminum-silicon alloy, and the preparation process comprises the following steps:
step A, stirring and tackifying: adding the aluminum melt with the temperature of 680 ℃ and the tackifier into a stirrer in proportion, stirring for 21min for tackifying, wherein the tackifier is elemental calcium with the content of more than or equal to 95%;
step B, cooling and foaming: adding a coolant into the stirred and tackified melt in proportion for rapid cooling, starting the air cooling function of a special air cooling and spraying device, slowly cooling the melt to 660 ℃, stirring at the rotating speed of 600r/min, adding a foaming agent, stirring for 6min, pouring into a cooling tank, wherein the coolant is magnetic powder prepared from manganese-zinc ferrite with the particle size of 300 meshes, and the foaming agent is TiO2And TiH2Rolling ball milling coating foaming agent is formed according to the mass ratio of 9: 1;
step C, cooling: the upper part of the cooling tank is covered by a heat-insulating cover, the spraying function of a special air cooling and spraying device is started, water mist is sprayed to the bottom of the cooling tank, and the temperature of the sprayed water is controlled at 80 ℃ so that the melt in the cooling tank is slowly solidified layer by layer.
The volume density of the wave-absorbing foamed aluminum prepared by the method is 0.21g/cm3Cutting foamed aluminum into a plate with the thickness of 15mm as a sample plate, and directly measuring the wave-absorbing property of the panel in the frequency range of 2-18GHz by using an arch method. The test system consists of bow-shaped device, signal source and detectorAnd the wave absorbing performance (RL) of the material is calculated by the power of the incident electromagnetic wave and the reflected electromagnetic wave.
Example 3
The aluminum melt comprises, by mass, 62% of an aluminum melt, 6% of a tackifier, 22% of a coolant and 18% of a foaming agent, wherein the aluminum melt is prepared by melting pure aluminum or aluminum-silicon alloy, and the preparation process comprises the following steps:
step A, stirring and tackifying: adding the aluminum melt with the temperature of 690 ℃ and the tackifier into a stirrer in proportion, stirring for 22min for tackifying, wherein the tackifier is elemental calcium with the content of more than or equal to 95%;
step B, cooling and foaming: adding a coolant into the stirred and tackified melt in proportion for rapid cooling, starting the air cooling function of a special air cooling and spraying device, slowly cooling the melt to 660 ℃, stirring at the rotating speed of 610r/min, adding a foaming agent, stirring for 7min, pouring the mixture into a cooling tank, wherein the coolant is magnetic powder prepared from manganese-zinc ferrite with the particle size of 400 meshes, and the foaming agent is TiO2And TiH2Rolling ball milling coating foaming agent is formed according to the mass ratio of 9: 1;
step C, cooling: the upper part of the cooling tank is covered by a heat-insulating cover, the spraying function of a special air cooling and spraying device is started, water mist is sprayed to the bottom of the cooling tank, and the temperature of the sprayed water is controlled at 90 ℃ so that the melt in the cooling tank is slowly solidified layer by layer.
The volume density of the wave-absorbing foamed aluminum prepared by the method is 0.21g/cm3Cutting foamed aluminum into a plate with the thickness of 15mm as a sample plate, and directly measuring the wave-absorbing property of the panel in the frequency range of 2-18GHz by using an arch method. The test system consists of an arch device, a signal source and a vector network analyzer, and calculates the wave-absorbing performance (RL) of the material according to the power of incident electromagnetic waves and reflected electromagnetic waves.
Referring to fig. 3, curve a shows the reflection loss of the foamed aluminum material prepared from pure aluminum, and curve B shows the reflection loss of the foamed aluminum wave-absorbing material prepared according to the technical scheme of the present application, and it can be seen by comparing the reflection curve a with the reflection curve B that the reflection loss of the foamed aluminum wave-absorbing material is significantly improved, the bandwidth of the effective loss (< -10 dB) in the frequency range of 2-18GHz is greater than 8GHz, and the foamed aluminum wave-absorbing material can be applied to the wave-absorbing field.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A preparation method of a foamed aluminum wave-absorbing material comprises the following components, by mass, 58-62% of an aluminum melt, 4-6% of a tackifier, 18-22% of a cooling agent and 15-18% of a foaming agent, wherein the aluminum melt is prepared by melting pure aluminum or aluminum-silicon alloy, and the preparation method is characterized by comprising the following steps:
step A, stirring and tackifying: adding the aluminum melt and the tackifier which are cooled to 670-690 ℃ in proportion into a stirrer, and stirring for 20-22min for tackifying;
step B, cooling and foaming: adding a coolant into the stirred and tackified melt in proportion for rapid cooling, starting the air cooling function of a special air cooling and spraying device, slowly cooling the melt to 650-660 ℃, stirring at a speed of 590-610r/min, adding a foaming agent, stirring for 5-7min, and pouring into a cooling tank;
step C, cooling: covering the upper part of the cooling tank by a heat-insulating cover, starting the spraying function of a special air cooling and spraying device, spraying water mist to the bottom of the cooling tank, and controlling the temperature of the spraying water at 70-90 ℃ to slowly solidify the melt in the cooling tank layer by layer.
2. The preparation method of the foam aluminum wave-absorbing material according to claim 1, wherein the tackifier is elemental calcium, and the content of the elemental calcium is not less than 95%.
3. The method for preparing the foam aluminum wave-absorbing material according to claim 1, wherein the coolant is magnetic powder made of ferrite with the particle size of 300-400 meshes.
4. The preparation method of the foamed aluminum wave-absorbing material according to claim 3, wherein the ferrite is one or a combination of manganese zinc ferrite or nickel zinc ferrite.
5. The method for preparing the foamed aluminum wave-absorbing material according to claim 1, wherein the foaming agent is TiO2And TiH2The components are mixed according to the mass ratio of 9: 1.
6. The preparation method of the foamed aluminum wave-absorbing material according to claim 5, wherein the foaming agent is a rolling ball-milling coated foaming agent.
7. A special air cooling and spray set for preparing foamed aluminum wave-absorbing material is characterized in that:
1 base (1);
the stirrer component (2) is arranged on one side of the base and comprises a support (21) arranged on the base, a stirring tank (22) positioned above the support, a worm gear transmission device (5) arranged on the support and used for driving the stirring tank to rotate, a stirrer (23) arranged in the stirring tank, a stirrer motor (25) arranged above the stirrer and used for driving the stirrer through a long shaft (24), and a hydraulic lifting device (26) arranged on one side of the stirring tank and used for driving a stirrer shaft and the stirrer to move up and down, wherein the tank wall of the stirring tank is of an inner-layer and outer-layer hollow structure, an air inlet port (27) is formed in the bottom of the outer-layer tank wall of the stirring tank, and a plurality of air outlets (28) are formed in the side surface of the outer-layer tank wall;
1 fan (3) is arranged on the base and below the stirring tank, the outlet of the fan is connected with one end of an air pipe (31), and the other end of the air pipe is connected with an air inlet port of the stirring tank;
the cooling assembly (4) is arranged on the other side of the base and comprises a cooling box (41) arranged on the base, a cooling tank (42) arranged on the upper portion of the cooling box, a water conveying pipe (43) arranged between the cooling box and the cooling box, a plurality of atomizing spray heads (44) arranged on the water conveying pipe and used for spraying water to the bottom of the cooling tank, a water pump (45) connected with an external water source and the water conveying pipe, a slidable heat preservation cover (46) arranged on the upper portion of the cooling tank and a heat preservation cover sliding rail (47) on which the heat preservation cover can move.
8. The special air cooling and spraying device prepared from the foamed aluminum wave-absorbing material according to claim 7, wherein the worm gear and worm transmission device comprises a fan-shaped turbine (51) fixed at the bottom of the stirring tank, a worm (52) fixed on a support and meshed with the fan-shaped turbine, and a worm driving motor (53).
9. The special air cooling and spraying device for preparing the foamed aluminum wave absorbing material according to claim 7, wherein a plurality of supporting plates (48) for supporting a cooling tank are arranged on opposite side walls inside the cooling box, and an electric heating wire (49) is arranged at the bottom of the cooling box.
10. The special air cooling and spraying device prepared from the foamed aluminum wave-absorbing material according to claim 7, wherein universal rollers (11) are mounted at four corners of the bottom of the base, and self-locking devices are arranged in the universal rollers.
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| CN214552853U (en) * | 2021-03-02 | 2021-11-02 | 江苏宁博机械制造有限公司 | Hot melting stirring device of special wax matrix of automobile parts casting |
| CN215237679U (en) * | 2021-04-29 | 2021-12-21 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Continuous casting crystallizer subregion cooling system |
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