Aluminum ingot melting device

Abstract

The invention relates to the technical field of aluminum melting furnaces, in particular to an aluminum ingot melting device which comprises a gas system and a melting system. The fuel gas system comprises a first gas cylinder, and compressed natural gas is contained in the first gas cylinder. The melting system comprises a melting furnace, the melting furnace is provided with a melting space, and a plurality of first combustion ports are formed in the side wall, corresponding to the melting space, of the melting furnace; when the aluminum ingot melting device works, an aluminum ingot in the melting space is rapidly heated to a first temperature, the aluminum ingot is in an unmelted state when the first temperature is reached, and after the first temperature is reached, unburnt compressed natural gas is directly blown to the aluminum ingot through the first burning port, so that the aluminum ingot is cooled and cracked or an oxide layer is cracked; after cooling for a preset time, heating the aluminum ingot with the cracked surface until the aluminum ingot is molten; according to the method, the aluminum ingot is rapidly heated to the non-molten state, then through rapid cooling and thermal expansion and cold contraction, an oxide layer is cracked or broken, the aluminum ingot is cracked and even broken, and the heating effect is improved through reduction of a subsequent heating oxide film or increase of the contact area.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum melting furnaces, and in particular to an aluminum ingot melting device. Background Art

[0002] The basic material of alloys such as silicon-aluminum-carbon alloy, silicon-zirconium-aluminum alloy, high-silicon-aluminum alloy, and silicon-aluminum-titanium alloy is aluminum. The preparation of various alloys mostly adopts mechanical stirring method, that is, the reinforcement particles are added to the matrix metal liquid (aluminum metal liquid / aluminum water) during the stirring process, and the reinforcement is evenly mixed into the matrix metal liquid by a high-speed rotating stirring device, and then poured into the mold to obtain the desired casting; in the production process, the aluminum ingot needs to be melted to obtain aluminum metal liquid. The existing melting devices are all directly heating the aluminum ingot until it melts. Since there is a layer of oxide film on the surface of the aluminum ingot, namely aluminum oxide, the thermal conductivity of aluminum oxide is about 30W / (m·K), while the thermal conductivity of pure aluminum is as high as about 205W / (m·K); therefore, the thermal conductivity of the oxide layer is much lower than that of pure aluminum, which will hinder heat transfer to a certain extent, resulting in low heating efficiency. Therefore, a melting device for aluminum ingots that can improve heating efficiency is needed. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an aluminum ingot melting device capable of improving heating efficiency.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: An aluminum ingot melting device comprises a gas system and a melting system; The gas system comprises a first mixing valve, a second mixing valve, a first gas cylinder, a second gas cylinder, and a blower; the first mixing valve is provided with a first inlet, a second inlet and a first outlet; the first inlet is connected to the first gas cylinder, and the second inlet is connected to the blower to inhale air; the second mixing valve comprises a fourth inlet, a fifth inlet and a second outlet, the fourth inlet is connected to the first gas cylinder, and the fifth inlet is connected to the outside; the first gas cylinder contains compressed natural gas; The melting system includes a melting furnace, a melting pool, a first igniter, a second igniter, and an exhaust pump. The melting furnace has a melting space, and the top of the melting space has a cover body. The bottom of the melting space is inclined and connected to the melting pool, and the bottom of the melting space is on the higher side; the space in which the melting space and the melting pool are connected as a whole is a closed space; a plurality of first combustion ports are arranged on the side wall of the melting furnace corresponding to the melting space, and the first igniter is arranged at the first combustion port. The first combustion port quickly heats the aluminum ingot in the melting space to a first temperature. When the first temperature is reached, the aluminum ingot is in an unmelted state. After reaching the first temperature, the first igniter is kept in a closed state, and the first mixing valve disconnects the second inlet so that the unburned compressed natural gas is directly blown to the aluminum ingot through the first combustion port, causing the aluminum ingot to cool and crack or the oxide layer to crack; a recovery port is arranged on the cover body, and the recovery port is connected to the second gas cylinder through the exhaust pump.

[0005] Preferably, the melting system further comprises a second igniter, a second combustion port is arranged below the melting pool and on the outer periphery of the side wall, the second combustion port is connected to the second outlet; and the second igniter is arranged at the second combustion port.

[0006] Preferably, the first mixing valve is further provided with a third inlet, and the third inlet is connected to the second gas cylinder. The first mixing valve is provided with a flow regulator, a natural gas metering sensor and an air flow sensor; When the third inlet is in a connected state, the flow regulator calculates the ratio of natural gas to air through the natural gas metering sensor and the air flow sensor and then negatively feedback adjusts the opening of the first inlet and the second inlet.

[0007] Preferably, the blower comprises an air inlet and an air outlet, and the air outlet is connected to the second inlet; A first filter is arranged on the air inlet.

[0008] Preferably, a second filter is provided between the recovery port and the vacuum pump.

[0009] Preferably, the melting system further comprises an oscillator, and the oscillator is connected to the melting pool.

[0010] Preferably, the melting system further comprises a first temperature sensor and a second temperature sensor, wherein the first temperature sensor is located in the melting space, and the second temperature sensor is located in the melting pool; The aluminum ingot melting device also includes an alarm; the alarm is electrically connected to the first temperature sensor and the second temperature sensor respectively; when the first temperature sensor exceeds the second temperature and / or the second temperature sensor exceeds the first interval, the alarm sounds an alarm.

[0011] Preferably, the first temperature and the second temperature are obtained by a first temperature sensor; and the first interval is obtained by a second temperature sensor.

[0012] Preferably, a closable furnace door is provided on the side wall of the melting furnace.

[0013] Preferably, the first igniter and the second igniter are both ceramic igniters.

[0014] The beneficial effects of the present invention are as follows: by rapidly heating the aluminum ingot in the melting space to an unmelted state and then rapidly cooling it by compressed natural gas, the compressed natural gas expands and absorbs heat, and there is a difference in the thermal expansion coefficients of the oxide layer and the aluminum itself, and the resulting thermal expansion and contraction causes the oxide layer to crack or break, and the aluminum ingot itself may crack or even break, all of which will increase the contact area between the aluminum itself and the outside world, and after the rapid cooling, the first inlet is closed, and the vacuum pump is turned on to pump the unburned gas into the second gas cylinder, and the space connected to the melting space and the melting pool is a closed space, no oxygen enters, and it is difficult to An oxide film is formed; vacuum melting can also be carried out. In the subsequent heating process, the reduction of the oxide film or the increase of the contact area can improve the thermal conductivity, thereby improving the heating effect and heating efficiency, shortening the heating time, and also avoiding the loss of heat due to insufficient thermal conductivity, killing two birds with one stone; the unburned gas is pumped into the second gas cylinder through the vacuum pump, which can also avoid the explosion when ignited again, ensuring safety, achieving three birds with one stone; since natural gas is used for heating and cooling, no other cooling gas is introduced, which greatly simplifies the entire aluminum ingot melting device, thereby reducing the cost of use and ensuring simplicity. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of an aluminum ingot melting device according to a specific embodiment of the present invention; Explanation of reference numerals: 1. gas system; 11. first mixing valve; 111. first inlet; 112. second inlet; 113. third inlet; 114. first outlet; 12. second mixing valve; 121. fourth inlet; 122. fifth inlet; 123. second outlet; 13. first gas cylinder; 14. second gas cylinder; 15. blower; 2. melting system; 21. melting furnace; 211. melting space; 212. cover; 213. first combustion port; 214. recovery port; 215. second filter; 22. melting pool; 221. second combustion port; 23. vacuum pump; 3. aluminum ingot. DETAILED DESCRIPTION

[0016] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0017] Please refer to Figure 1, an aluminum ingot melting device, comprising a gas system 1 and a melting system 2; The gas system 1 includes a first mixing valve 11, a second mixing valve 12, a first gas cylinder 13, a second gas cylinder 14, and a blower 15; the first mixing valve 11 is provided with a first inlet 111, a second inlet 112, and a first outlet 114; the first inlet 111 is connected to the first gas cylinder 13, and the second inlet 112 is connected to the blower 15 to inhale air; the second mixing valve 12 includes a fourth inlet 121, a fifth inlet 122, and a second outlet 123, the fourth inlet 121 is connected to the first gas cylinder 13, and the fifth inlet 122 is connected to the outside; the first gas cylinder 13 contains compressed natural gas; The melting system 2 comprises a melting furnace 21, a melting pool 22, a first igniter, a second igniter, and an exhaust pump 23. The melting furnace 21 has a melting space 211. The top of the melting space 211 has a cover 212. The bottom of the melting space 211 is inclined and connected to the melting pool 22, and the bottom of the melting space 211 is on the higher side. The space where the melting space 211 and the melting pool 22 are connected as one is a closed space. A plurality of first combustion ports 213 are arranged on the side wall of the melting furnace 21 corresponding to the melting space 211, and the first igniter is arranged at the first combustion port 213. A second combustion port 221 is arranged below the melting pool 22 and on the outer periphery of the side wall, and the second combustion port 221 is connected to the second outlet 123. The second igniter is arranged at the second combustion port 221. A recovery port 214 is arranged on the cover 212, and the recovery port 214 is connected to the second gas cylinder 14 through the exhaust pump 23. When the aluminum ingot 3 melting device is working, the cover 212 is opened, a plurality of aluminum ingots 3 are poured into the melting space 211, and then the cover 212 is closed, and the vacuum pump 23 is closed at the same time. The first mixing valve 11 connects the first inlet 111 and the second inlet 112, and the blower 15 is started and the first igniter is ignited to quickly heat the aluminum ingots 3 in the melting space 211 to a first temperature. When the first temperature is reached, the aluminum ingots 3 are in an unmelted state. After reaching the first temperature, the first igniter is kept in a closed state, and the first mixing valve 11 disconnects the second inlet 112 so that the unburned compressed natural gas is directly blown toward the aluminum ingots 3 through the first combustion port 213. The aluminum ingot 3 is caused to crack upon cooling or the oxide layer is caused to crack. After a predetermined cooling time, the first mixing valve 11 closes the first inlet 111, and at the same time, the vacuum pump 23 is turned on to draw unburned natural gas into the second gas cylinder 14. Then, the first mixing valve 11 connects the first inlet 111 and the second inlet 112, and the blower 15 is started and the first igniter is ignited again to heat the aluminum ingot 3 with cracks on the surface to melt; at the same time, the fourth inlet 121 and the fifth inlet 122 of the second mixing valve 12 are started, and the second igniter is started to ignite the second combustion port 221 for heat preservation; when the aluminum ingot 3 is completely melted, the first mixing valve 11 and the blower 15 are closed.

[0018] From the above description, it can be known that by rapidly heating the aluminum ingot 3 in the melting space 211 to an unmelted state and then rapidly cooling it by compressed natural gas, due to the expansion and heat absorption of compressed natural gas, there is a difference in the thermal expansion coefficients of the oxide layer and the aluminum itself, and the resulting thermal expansion and contraction causes the oxide layer to crack or break, and the aluminum ingot 3 itself may crack or even break. These situations will increase the contact area between the aluminum itself and the outside world. After the rapid cooling, the first inlet 111 is closed, and the vacuum pump 23 is turned on to pump the unburned gas into the second gas cylinder 14. The space in which the melting space 211 and the melting pool 22 are connected as one is a closed space, and no oxygen enters. It is difficult to form an oxide film when entering; vacuum melting can also be carried out, and the reduction of the oxide film or the increase of the contact area in the subsequent heating process can improve the thermal conductivity, thereby improving the heating effect and heating efficiency, shortening the heating time, and also avoiding the loss of heat due to insufficient thermal conductivity, killing two birds with one stone; the unburned gas is pumped into the second gas cylinder 14 by the vacuum pump 23, which can also avoid the explosion when ignited again, ensuring safety, achieving three goals with one stone; since natural gas is used for heating and cooling, no other cooling gas is introduced, which greatly simplifies the entire aluminum ingot 3 melting device, thereby reducing the cost of use and ensuring simplicity.

[0019] Furthermore, the first mixing valve 11 is also provided with a third inlet 113 , and the third inlet 113 is connected to the second gas cylinder 14 .

[0020] It can be seen from the above description that the recovered unburned natural gas can be reused by connecting the third inlet 113 to the second gas cylinder 14 .

[0021] Furthermore, the first mixing valve 11 is provided with a flow regulator, a natural gas metering sensor and an air flow sensor; When the third inlet 113 is in a connected state, the flow regulator calculates the ratio of natural gas to air through the natural gas metering sensor and the air flow sensor and then negatively feedback adjusts the opening of the first inlet 111 and the second inlet 112 .

[0022] From the above description, it can be seen that the gas entering through the third inlet 113 each time may have deviations, that is, the quality, quantity and external temperature of the aluminum ingot 3 will affect the final recycled gas ratio, while the input of natural gas and air into the first inlet 111 and the second inlet 112 is relatively fixed. Therefore, when adjusting, adjusting the opening of the first inlet 111 and the second inlet 112 is the easiest to control.

[0023] Further, the blower 15 includes an air inlet and an air outlet, and the air outlet is connected to the second inlet 112; A first filter is arranged on the air inlet.

[0024] It can be seen from the above description that the first filter can prevent impurities from entering the melting furnace 21 .

[0025] Furthermore, a second filter 215 is provided between the recovery port 214 and the air pump 23 .

[0026] It can be seen from the above description that, by providing the second filter 215 , it is possible to prevent the gas in the smelting furnace from entering the second gas cylinder 14 .

[0027] Furthermore, the melting system 2 also includes an oscillator, which is connected to the melting pool 22 .

[0028] From the above description, it can be seen that the oscillator can ensure that the impurities in the molten aluminum water sink to the bottom or float up through the oscillation, which is convenient for subsequent processing or cleaning.

[0029] Furthermore, the melting system 2 further includes a first temperature sensor and a second temperature sensor, wherein the first temperature sensor is located in the melting space 211 and the second temperature sensor is located in the melting pool 22; The aluminum ingot 3 melting device also includes an alarm; the alarm is electrically connected to the first temperature sensor and the second temperature sensor respectively; when the first temperature sensor exceeds the second temperature and / or the second temperature sensor exceeds the first interval, the alarm sounds an alarm.

[0030] From the above description, it can be seen that the alarm can avoid overheating or low temperature and ensure the melting effect.

[0031] Furthermore, the first temperature and the second temperature are obtained by a first temperature sensor; and the first interval is obtained by a second temperature sensor.

[0032] Furthermore, a closable furnace door is provided on the side wall of the melting furnace 21 .

[0033] It can be seen from the above description that the interior of the melting furnace 21 can be cleaned through the furnace door after the melting is completed.

[0034] Furthermore, the first igniter and the second igniter are both ceramic igniters.

[0035] From the above description, it can be seen that the ceramic igniter has a long service life and is resistant to high temperatures. Embodiment 1 An aluminum ingot melting device comprises a gas system 1 and a melting system 2; The gas system 1 includes a first mixing valve 11, a second mixing valve 12, a first gas cylinder 13, a second gas cylinder 14, and a blower 15; the first mixing valve 11 is provided with a first inlet 111, a second inlet 112, and a first outlet 114; the first inlet 111 is connected to the first gas cylinder 13, and the second inlet 112 is connected to the blower 15 to inhale air; the second mixing valve 12 includes a fourth inlet 121, a fifth inlet 122, and a second outlet 123, the fourth inlet 121 is connected to the first gas cylinder 13, and the fifth inlet 122 is connected to the outside; the first gas cylinder 13 contains compressed natural gas; The melting system 2 comprises a melting furnace 21, a melting pool 22, a first igniter, a second igniter, and an exhaust pump 23. The melting furnace 21 has a melting space 211. The top of the melting space 211 has a cover 212. The bottom of the melting space 211 is inclined and connected to the melting pool 22, and the bottom of the melting space 211 is on the higher side. The space where the melting space 211 and the melting pool 22 are connected as one is a closed space. A plurality of first combustion ports 213 are arranged on the side wall of the melting furnace 21 corresponding to the melting space 211, and the first igniter is arranged at the first combustion port 213. A second combustion port 221 is arranged below the melting pool 22 and on the outer periphery of the side wall, and the second combustion port 221 is connected to the second outlet 123. The second igniter is arranged at the second combustion port 221. A recovery port 214 is arranged on the cover 212, and the recovery port 214 is connected to the second gas cylinder 14 through the exhaust pump 23. When the aluminum ingot 3 melting device is working, the cover 212 is opened, a plurality of aluminum ingots 3 are poured into the melting space 211, and then the cover 212 is closed, and the vacuum pump 23 is closed at the same time. The first mixing valve 11 connects the first inlet 111 and the second inlet 112, and the blower 15 is started and the first igniter is ignited to quickly heat the aluminum ingots 3 in the melting space 211 to a first temperature (for example, 500°C, which can of course be adjusted according to the type and quantity of the aluminum ingots 3). When the first temperature is reached, the aluminum ingots 3 are in an unmelted state. After reaching the first temperature, the first igniter is kept in a closed state, and the first mixing valve 11 disconnects the second inlet 112 so that the unburned compressed natural gas passes directly. The first combustion port 213 blows toward the aluminum ingot 3, causing the aluminum ingot 3 to crack upon cooling or the oxide layer to crack. After a predetermined cooling time, the first mixing valve 11 closes the first inlet 111, and at the same time, the vacuum pump 23 is turned on to draw unburned natural gas into the second gas cylinder 14. Then, the first mixing valve 11 connects the first inlet 111 and the second inlet 112, and the blower 15 is started and the first igniter is ignited again to heat the aluminum ingot 3 with cracks on the surface to melt; at the same time, the fourth inlet 121 and the fifth inlet 122 of the second mixing valve 12 are started, and the second igniter is started to ignite the second combustion port 221 for heat preservation; when the aluminum ingot 3 is completely melted, the first mixing valve 11 and the blower 15 are closed.

[0036] The first mixing valve 11 is further provided with a third inlet 113 , and the third inlet 113 is communicated with the second gas cylinder 14 .

[0037] The first mixing valve 11 is provided with a flow regulator, a natural gas metering sensor and an air flow sensor; When the third inlet 113 is in a connected state, the flow regulator calculates the ratio of natural gas to air through the natural gas metering sensor and the air flow sensor and then negatively feedback adjusts the opening of the first inlet 111 and the second inlet 112 .

[0038] The blower 15 includes an air inlet and an air outlet, and the air outlet is connected to the second inlet 112; A first filter is arranged on the air inlet.

[0039] A second filter 215 is provided between the recovery port 214 and the air pump 23 .

[0040] The melting system 2 further includes an oscillator, which is connected to the melting pool 22 .

[0041] The melting system 2 further includes a first temperature sensor and a second temperature sensor, wherein the first temperature sensor is located in the melting space 211 and the second temperature sensor is located in the melting pool 22; The aluminum ingot 3 melting device also includes an alarm; the alarm is electrically connected to the first temperature sensor and the second temperature sensor respectively; when the first temperature sensor exceeds the second temperature (for example, 1000°C, which can of course be adjusted according to the type and quantity of the aluminum ingot 3) and / or the second temperature sensor exceeds the first interval (for example, 700°C-750°C, as long as it can maintain liquid state), the alarm sounds.

[0042] The first temperature and the second temperature are obtained by a first temperature sensor; and the first interval is obtained by a second temperature sensor.

[0043] The side wall of the melting furnace 21 is provided with a furnace door which can be opened and closed.

[0044] The first igniter and the second igniter are both ceramic igniters. Embodiment 2 An aluminum ingot melting device comprises a gas system 1 and a melting system 2; The gas system 1 includes a first mixing valve 11, a second mixing valve 12, a first gas cylinder 13, a second gas cylinder 14, and a blower 15; the first mixing valve 11 is provided with a first inlet 111, a second inlet 112, and a first outlet 114; the first inlet 111 is connected to the first gas cylinder 13, and the second inlet 112 is connected to the blower 15 to inhale air; the second mixing valve 12 includes a fourth inlet 121, a fifth inlet 122, and a second outlet 123, the fourth inlet 121 is connected to the first gas cylinder 13, and the fifth inlet 122 is connected to the outside; the first gas cylinder 13 contains compressed natural gas; The melting system 2 comprises a melting furnace 21, a melting pool 22, a first igniter, a second igniter, and an exhaust pump 23. The melting furnace 21 has a melting space 211. The top of the melting space 211 has a cover 212. The bottom of the melting space 211 is inclined and connected to the melting pool 22, and the bottom of the melting space 211 is on the higher side. The space where the melting space 211 and the melting pool 22 are connected as one is a closed space. A plurality of first combustion ports 213 are arranged on the side wall of the melting furnace 21 corresponding to the melting space 211, and the first igniter is arranged at the first combustion port 213. A second combustion port 221 is arranged below the melting pool 22 and on the outer periphery of the side wall, and the second combustion port 221 is connected to the second outlet 123. The second igniter is arranged at the second combustion port 221. A recovery port 214 is arranged on the cover 212, and the recovery port 214 is connected to the second gas cylinder 14 through the exhaust pump 23. When the aluminum ingot 3 melting device is working, the cover 212 is opened, a plurality of aluminum ingots 3 are poured into the melting space 211, and then the cover 212 is closed, and the vacuum pump 23 is closed at the same time. The first mixing valve 11 connects the first inlet 111 and the second inlet 112, and the blower 15 is started and the first igniter is ignited to quickly heat the aluminum ingots 3 in the melting space 211 to a first temperature (for example, 500°C, which can of course be adjusted according to the type and quantity of the aluminum ingots 3). When the first temperature is reached, the aluminum ingots 3 are in an unmelted state. After reaching the first temperature, the first igniter is kept in a closed state, and the first mixing valve 11 disconnects the second inlet 112 so that the unburned compressed natural gas passes directly. The first combustion port 213 blows toward the aluminum ingot 3, causing the aluminum ingot 3 to crack upon cooling or the oxide layer to crack. After a predetermined cooling time, the first mixing valve 11 closes the first inlet 111, and at the same time, the vacuum pump 23 is turned on to draw unburned natural gas into the second gas cylinder 14. Then, the first mixing valve 11 connects the first inlet 111 and the second inlet 112, and the blower 15 is started and the first igniter is ignited again to heat the aluminum ingot 3 with cracks on the surface to melt; at the same time, the fourth inlet 121 and the fifth inlet 122 of the second mixing valve 12 are started, and the second igniter is started to ignite the second combustion port 221 for heat preservation; when the aluminum ingot 3 is completely melted, the first mixing valve 11 and the blower 15 are closed.

[0045] The blower 15 includes an air inlet and an air outlet, and the air outlet is connected to the second inlet 112; A first filter is arranged on the air inlet.

[0046] A second filter 215 is provided between the recovery port 214 and the air pump 23 .

[0047] The melting system 2 further includes a first temperature sensor and a second temperature sensor, wherein the first temperature sensor is located in the melting space 211 and the second temperature sensor is located in the melting pool 22; The aluminum ingot 3 melting device also includes an alarm; the alarm is electrically connected to the first temperature sensor and the second temperature sensor respectively; when the first temperature sensor exceeds the second temperature (for example, 1000°C, which can of course be adjusted according to the type and quantity of the aluminum ingot 3) and / or the second temperature sensor exceeds the first interval (for example, 700°C-750°C, as long as it can maintain liquid state), the alarm sounds.

[0048] The first temperature and the second temperature are obtained by a first temperature sensor; and the first interval is obtained by a second temperature sensor.

[0049] The side wall of the melting furnace 21 is provided with a furnace door which can be opened and closed.

[0050] The first igniter and the second igniter are both ceramic igniters. The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An aluminum ingot melting device, characterized in that: Including gas system and melting system; The gas system comprises a first mixing valve, a second mixing valve, a first gas cylinder, a second gas cylinder, and a blower; the first mixing valve is provided with a first inlet, a second inlet and a first outlet; the first inlet is connected to the first gas cylinder, and the second inlet is connected to the blower to inhale air; the second mixing valve comprises a fourth inlet, a fifth inlet and a second outlet, the fourth inlet is connected to the first gas cylinder, and the fifth inlet is connected to the outside; the first gas cylinder contains compressed natural gas; The melting system includes a melting furnace, a melting pool, a first igniter, a second igniter, and an exhaust pump. The melting furnace has a melting space, and the top of the melting space has a cover body. The bottom of the melting space is inclined and connected to the melting pool, and the bottom of the melting space is on the higher side; the space in which the melting space and the melting pool are connected as a whole is a closed space; a plurality of first combustion ports are arranged on the side wall of the melting furnace corresponding to the melting space, and the first igniter is arranged at the first combustion port. The first combustion port quickly heats the aluminum ingot in the melting space to a first temperature. When the first temperature is reached, the aluminum ingot is in an unmelted state. After reaching the first temperature, the first igniter is kept in a closed state, and the first mixing valve disconnects the second inlet so that the unburned compressed natural gas is directly blown to the aluminum ingot through the first combustion port, causing the aluminum ingot to cool and crack or the oxide layer to crack; a recovery port is arranged on the cover body, and the recovery port is connected to the second gas cylinder through the exhaust pump.

2. The aluminum ingot melting device according to claim 1, characterized in that: The melting system further comprises a second igniter. A second combustion port is arranged below the melting pool and on the outer periphery of the side wall. The second combustion port is communicated with the second outlet. The second igniter is arranged at the second combustion port.

3. The aluminum ingot melting device according to claim 1, characterized in that: The first mixing valve is also provided with a third inlet, and the third inlet is connected to the second gas cylinder; the first mixing valve is provided with a flow regulator, a natural gas metering sensor and an air flow sensor; When the third inlet is in a connected state, the flow regulator calculates the ratio of natural gas to air through the natural gas metering sensor and the air flow sensor and then negatively feedback adjusts the opening of the first inlet and the second inlet.

4. The aluminum ingot melting device according to claim 1, characterized in that: The blower comprises an air inlet and an air outlet, wherein the air outlet is connected to the second inlet; A first filter is arranged on the air inlet.

5. The aluminum ingot melting device according to claim 1, characterized in that: A second filter is provided between the recovery port and the air pump.

6. The aluminum ingot melting device according to claim 1, characterized in that: The melting system further comprises an oscillator connected to the melting pool.

7. The aluminum ingot melting device according to claim 1, characterized in that: The melting system further includes a first temperature sensor and a second temperature sensor, wherein the first temperature sensor is located in the melting space, and the second temperature sensor is located in the melting pool; The aluminum ingot melting device also includes an alarm; the alarm is electrically connected to the first temperature sensor and the second temperature sensor respectively; when the first temperature sensor exceeds the second temperature and / or the second temperature sensor exceeds the first interval, the alarm sounds an alarm.

8. The aluminum ingot melting device according to claim 7, characterized in that: The first temperature and the second temperature are obtained by a first temperature sensor; and the first interval is obtained by a second temperature sensor.

9. The aluminum ingot melting device according to claim 1, characterized in that: The side wall of the melting furnace is provided with a furnace door which can be opened and closed.

10. The aluminum ingot melting device according to claim 1, characterized in that: The first igniter and the second igniter are both ceramic igniters.

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