An aluminum ingot melting device

Abstract

The present invention relates to the technical field of aluminum melting furnaces, and particularly relates to an aluminum ingot melting device, which includes a gas system and a melting system; the gas system includes a first gas cylinder, and the first gas cylinder contains compressed natural gas; the melting system includes a melting furnace, the melting furnace has a melting space, and a plurality of first combustion ports are arranged on the side wall of the melting furnace corresponding to the melting space; when the aluminum ingot melting device works, the aluminum ingots in the melting space are quickly heated to a first temperature, and when reaching the first temperature, the aluminum ingots are in an unmelted state. After reaching the first temperature, the unburned compressed natural gas is directly blown towards the aluminum ingots through the first combustion ports, causing the aluminum ingots to crack due to cooling or the oxide layer to crack. After cooling for a predetermined time, the aluminum ingots with cracked surfaces are heated to melting; in the present invention, the aluminum ingots are quickly heated to an unmelted state and then quickly cooled. Due to thermal expansion and contraction, the oxide layer cracks or breaks, and the aluminum ingots themselves crack or even break. Subsequently, the reduction of the heating oxide film or the increase in the contact area improves the heating effect.

Description

Technical Field

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

[0002] Aluminum is the basic material for alloys such as silicon-aluminum-carbon alloy, silicon-zirconium-aluminum alloy, high-silicon aluminum alloy, and silicon-aluminum-titanium alloy. The preparation of various alloys mostly adopts the mechanical stirring method, that is, during the stirring process, reinforcing particles are added to the matrix metal liquid (aluminum metal liquid / aluminum water), and the high-speed rotating stirring device is used to uniformly mix the reinforcing body into the matrix metal liquid, and then poured into a mold to obtain the desired casting; during the production process, it is necessary to melt the aluminum ingot to obtain aluminum metal liquid. Existing melting devices directly heat the aluminum ingot until it melts. Since there is an oxide film, i.e., alumina, on the surface of the aluminum ingot, the thermal conductivity of alumina is about 30 W / (m·K), while the thermal conductivity of pure aluminum is as high as about 205 W / (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 the problem of low heating efficiency. Therefore, an aluminum ingot melting device that can improve the 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 that can improve the heating efficiency.

[0004] To solve the above technical problem, the technical solution adopted by the present invention is:

[0005] An aluminum ingot melting device, comprising a gas system and a melting system;

[0006] The gas system includes 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 communicated with the first gas cylinder, and the second inlet is communicated with the blower to inhale air; the second mixing valve includes a fourth inlet, a fifth inlet, and a second outlet, the fourth inlet is communicated with the first gas cylinder, and the fifth inlet is communicated with the outside; the first gas cylinder contains compressed natural gas;

[0007] The melting system includes a melting furnace, a melting pool, a first igniter, a second igniter, and an air extraction pump. The melting furnace has a melting space, the top of the melting space has a cover, the bottom of the melting space is inclined and communicates with the melting pool, and the side of the bottom of the melting space away from the melting pool is the higher side; the space where the melting space communicates with the melting pool integrally is a closed space; a plurality of first combustion ports are provided on the side wall of the melting furnace corresponding to the melting space, the first igniter is arranged at the first combustion port, and the first combustion port quickly heats the aluminum ingot in the melting space to a first temperature. When reaching the first temperature, the aluminum ingot is in an unmelted state. After reaching the first temperature, the first igniter is kept closed and the first mixing valve disconnects the second inlet so that the unburned compressed natural gas directly blows towards 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 provided on the cover, and the recovery port communicates with a second gas cylinder through the air extraction pump.

[0008] Preferably, the melting system further includes a second igniter. Second combustion ports are provided below the melting pool and on the outer periphery of the side wall, and the second combustion ports communicate with a second outlet; the second igniter is arranged at the second combustion port.

[0009] Preferably, the first mixing valve is further provided with a third inlet, and the third inlet communicates with the second gas cylinder. A flow regulator, a natural gas metering sensor, and an air flow sensor are provided on the first mixing valve;

[0010] When the third inlet is in a connected state, the flow regulator calculates the ratio of natural gas and air through the natural gas metering sensor and the air flow sensor and then negatively feedback regulates the opening degrees of the first inlet and the second inlet.

[0011] Preferably, the blower includes an air inlet and an air outlet, and the air outlet communicates with the second inlet;

[0012] A first filter is provided on the air inlet.

[0013] Preferably, a second filter is provided between the recovery port and the air extraction pump.

[0014] Preferably, the melting system further includes an oscillator, and the oscillator is connected to the melting pool.

[0015] Preferably, the melting system further includes a first temperature sensor and a second temperature sensor. The first temperature sensor is located in the melting space, and the second temperature sensor is located in the melting pool;

[0016] The aluminum ingot melting device further 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 gives an alarm.

[0017] Preferably, the first temperature and the second temperature are obtained by a first temperature sensor; the first interval is obtained by a second temperature sensor.

[0018] Preferably, an openable and closable furnace door is provided on the side wall of the melting furnace.

[0019] Preferably, both the first igniter and the second igniter are ceramic igniters.

[0020] The beneficial effects of the present invention are as follows: The aluminum ingot in the melting space is quickly heated to an unmolten state and then quickly cooled by compressed natural gas. Since the compressed natural gas expands and absorbs heat, and there is a difference in the thermal expansion coefficients between the oxide layer and the aluminum itself, the resulting thermal expansion and contraction causes the oxide layer to crack or break, and the aluminum ingot itself may crack or even break into pieces. All these situations will increase the contact area between the aluminum itself and the outside. Then, after rapid cooling, the first inlet is closed, and at the same time, the air pump is turned on to pump the unburned gas into the second gas cylinder. Considering that the space where the melting space is connected to the melting pool is a closed space and no oxygen enters, it is difficult to form an oxide film again; vacuum melting can also be carried out. The reduction of the oxide film or the increase in the contact area during the subsequent heating process can improve the heat conduction rate, thereby improving the heating effect and heating efficiency, shortening the heating time, and at the same time avoiding heat loss due to insufficient heat conduction rate, achieving two goals with one action; pumping the unburned gas into the second gas cylinder by the air pump can also avoid the explosion during re-ignition, ensuring safety, achieving three goals with one action; since both heating and cooling use natural gas and no other cooling gas is introduced, the entire aluminum ingot melting device is greatly simplified, thereby reducing the use cost and ensuring simplicity. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of an aluminum ingot melting device according to a specific embodiment of the present invention;

[0022] 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 body; 213. First combustion port; 214. Recovery port; 215. Second filter; 22. Melting pool; 221. Second combustion port; 23. Air pump; 3. Aluminum ingot. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] In order to describe in detail the technical content, the achieved objectives and the effects of the present invention, the following is described in conjunction with the embodiments and with reference to the accompanying drawings.

[0024] Please refer to Figure 1 , an aluminum ingot melting device, comprising a gas system 1 and a melting system 2;

[0025] 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 communicated with the first gas cylinder 13, and the second inlet 112 is communicated with 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 communicated with the first gas cylinder 13, and the fifth inlet 122 is communicated with the outside; the first gas cylinder 13 contains compressed natural gas;

[0026] The melting system 2 includes a melting furnace 21, a melting pool 22, a first igniter, a second igniter, and a suction 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 communicated with the melting pool 22, and the side of the bottom of the melting space 211 away from the melting pool is the higher side; the space where the melting space 211 is communicated with the melting pool 22 is a closed space; a plurality of first combustion ports 213 are provided 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; second combustion ports 221 are provided below and on the outer periphery of the side wall of the melting pool 22, and the second combustion ports 221 are communicated with the second outlet 123; the second igniter is arranged at the second combustion port 221; a recovery port 214 is provided on the cover 212, and the recovery port 214 is communicated with the second gas cylinder 14 through the suction pump 23;

[0027] When the aluminum ingot 3 melting device works, open the cover body 212, pour multiple aluminum ingots 3 into the melting space 211, then cover the cover body 212. At the same time, turn off the air extraction pump 23. The first mixing valve 11 connects the first inlet 111 and the second inlet 112. Start the blower 15 and ignite the first igniter to quickly heat the aluminum ingots 3 in the melting space 211 to the first temperature. When reaching the first temperature, the aluminum ingots 3 are in an unmelted state. After reaching the first temperature, keep the first igniter in the off state and the first mixing valve 11 disconnects the second inlet 112 so that the unburned compressed natural gas directly blows towards the aluminum ingots 3 through the first combustion port 213, causing the aluminum ingots 3 to crack due to cooling or the oxide layer to crack. After cooling for a predetermined time, the first mixing valve 11 closes the first inlet 111. At the same time, turn on the air extraction pump 23 to pump the 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. Start the blower 15 and the first igniter ignites again to heat the aluminum ingots 3 with cracked surfaces to melting. At the same time, start the fourth inlet 121 and the fifth inlet 122 of the second mixing valve 12, and start the second igniter to ignite the second combustion port 221 for heat preservation. When the melting of the aluminum ingots 3 is completed, the first mixing valve 11 and the blower 15 are turned off.

[0028] As can be seen from the above description, by quickly heating the aluminum ingots 3 in the melting space 211 to an unmelted state and then quickly cooling them with compressed natural gas, due to the expansion and heat absorption of the compressed natural gas and the difference in the thermal expansion coefficients between the oxide layer and the aluminum itself, the resulting thermal expansion and contraction cause the oxide layer to crack or break, and the aluminum ingots 3 themselves may crack or even break into pieces. These situations will increase the contact area between the aluminum itself and the outside world. Then, in combination with closing the first inlet 111 after rapid cooling and turning on the air extraction pump 23 to pump the unburned gas into the second gas cylinder 14, and considering that the space where the melting space 211 is connected to the melting pool 22 is a closed space and no oxygen enters, it is difficult to form an oxide film again. Vacuum melting can also be carried out. The reduction of the oxide film or the increase in the contact area during the subsequent heating process can improve the heat conduction rate, thereby enhancing the heating effect and heating efficiency, shortening the heating time, and at the same time avoiding heat loss due to insufficient heat conduction rate, achieving two goals with one action. By using the air extraction pump 23 to pump the unburned gas into the second gas cylinder 14, it can also avoid the explosion during re-ignition, ensuring safety, achieving three goals with one action. Since both heating and cooling use natural gas and no other cooling gases are introduced, the entire aluminum ingot 3 melting device is greatly simplified, thereby reducing the usage cost and ensuring simplicity.

[0029] Further, 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.

[0030] As can be seen from the above description, by communicating the third inlet 113 with the second gas cylinder 14, the recycled unburned natural gas can be reused.

[0031] Further, a flow regulator, a natural gas metering sensor, and an air flow sensor are provided on the first mixing valve 11;

[0032] When the third inlet 113 is in a communicating 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-regulates the opening degrees of the first inlet 111 and the second inlet 112.

[0033] As can be seen from the above description, the gas entering each time through the third inlet 113 may have deviations, that is, the quality and quantity of the aluminum ingots 3 and the external temperature will affect the final recovered gas ratio. However, the input of natural gas and air input through the first inlet 111 and the second inlet 112 is relatively fixed. Therefore, when adjusting, adjusting the opening degrees of the first inlet 111 and the second inlet 112 is the easiest to control.

[0034] Further, the blower 15 includes an air inlet and an air outlet, and the air outlet is communicated with the second inlet 112;

[0035] A first filter is provided on the air inlet.

[0036] As can be seen from the above description, through the first filter, impurities can be prevented from entering the melting furnace 21.

[0037] Further, a second filter 215 is provided between the recovery port 214 and the air extraction pump 23.

[0038] As can be seen from the above description, through the setting of the second filter 215, the gas in the smelting furnace can be prevented from entering the second gas cylinder 14.

[0039] Further, the melting system 2 further includes an oscillator, and the oscillator is connected to the melting pool 22.

[0040] As can be seen from the above description, through the oscillator, it can be ensured that the impurities in the molten aluminum after melting sink to the bottom or float up through oscillation, facilitating subsequent processing or cleaning.

[0041] Further, the melting system 2 further includes a first temperature sensor and a second temperature sensor. The first temperature sensor is located in the melting space 211, and the second temperature sensor is located in the melting pool 22;

[0042] The aluminum ingot 3 melting device further 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 gives an alarm.

[0043] As can be seen from the above description, by means of the alarm, overheating or low temperature can be avoided, and the melting effect can be ensured.

[0044] Further, the first temperature and the second temperature are obtained by a first temperature sensor; the first interval is obtained by a second temperature sensor.

[0045] Further, an openable and closable furnace door is provided on the side wall of the melting furnace 21.

[0046] As can be seen from the above description, through the furnace door, the inside of the melting furnace 21 can be cleaned after melting is completed.

[0047] Further, both the first igniter and the second igniter are ceramic igniters.

[0048] As can be seen from the above description, the ceramic igniter has a long service life and is resistant to high temperatures. Embodiment

[0049] An aluminum ingot melting device includes a gas system 1 and a melting system 2;

[0050] 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 communicated with the first gas cylinder 13, and the second inlet 112 is communicated with the blower 15 to suck in 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 communicated with the first gas cylinder 13, and the fifth inlet 122 is communicated with the outside; the first gas cylinder 13 contains compressed natural gas;

[0051] The melting system 2 includes a melting furnace 21, a melting pool 22, a first igniter, a second igniter, and an air extraction 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 communicated with the melting pool 22, and the side of the bottom of the melting space 211 away from the melting pool is the higher side; the space where the melting space 211 is communicated with the melting pool 22 is a closed space; a plurality of first combustion ports 213 are provided 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; second combustion ports 221 are provided below and on the outer periphery of the side wall of the melting pool 22, and the second combustion ports 221 are communicated with the second outlet 123; the second igniter is arranged at the second combustion port 221; a recovery port 214 is provided on the cover 212, and the recovery port 214 is communicated with the second gas cylinder 14 through the air extraction pump 23;

[0052] When the aluminum ingot 3 melting device works, open the cover body 212, pour multiple aluminum ingots 3 into the melting space 211, then cover the cover body 212. At the same time, turn off the air extraction pump 23, connect the first inlet 111 and the second inlet 112 of the first mixing valve 11, start the blower 15 and ignite the first igniter, quickly heat the aluminum ingots 3 in the melting space 211 to the first temperature (such as 500 °C, of course, it can also be adjusted according to the type and quantity of the aluminum ingots 3). When reaching the first temperature, the aluminum ingots 3 are in an unmelted state. After reaching the first temperature, keep the first igniter in the off state and the first mixing valve 11 disconnects the second inlet 112 so that the unburned compressed natural gas is directly blown towards the aluminum ingots 3 through the first combustion port 213, causing the aluminum ingots 3 to cool and crack or the oxide layer to crack. After cooling for a predetermined time, the first mixing valve 11 closes the first inlet 111, and at the same time, turn on the air extraction pump 23 to pump the 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, starts the blower 15 and the first igniter ignites again to heat the aluminum ingots 3 with surface cracks to melting; at the same time, start the fourth inlet 121 and the fifth inlet 122 of the second mixing valve 12, and start the second igniter to ignite the second combustion port 221 for heat preservation; when the aluminum ingots 3 are completely melted, the first mixing valve 11 and the blower 15 are turned off.

[0053] 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.

[0054] The first mixing valve 11 is provided with a flow regulator, a natural gas metering sensor and an air flow sensor;

[0055] When the third inlet 113 is in a communicating state, the flow regulator calculates the ratio of natural gas and air through the natural gas metering sensor and the air flow sensor, and then negatively feedback regulates the opening degrees of the first inlet 111 and the second inlet 112.

[0056] The blower 15 includes an air inlet and an air outlet, and the air outlet is communicated with the second inlet 112;

[0057] The air inlet is provided with a first filter.

[0058] There is a second filter 215 between the recovery port 214 and the air extraction pump 23.

[0059] The melting system 2 further includes an oscillator, and the oscillator is connected to the melting pool 22.

[0060] The melting system 2 further includes a first temperature sensor and a second temperature sensor. The first temperature sensor is located in the melting space 211, and the second temperature sensor is located in the melting pool 22;

[0061] The aluminum ingot 3 melting device further 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 (e.g., 1000 °C, which can of course be adjusted according to the type and quantity of the aluminum ingot 3) and / or when the second temperature sensor exceeds the first range (e.g., 700 °C - 750 °C, as long as it can maintain a liquid state), the alarm gives an alarm.

[0062] The first temperature and the second temperature are obtained through the first temperature sensor; the first range is obtained through the second temperature sensor.

[0063] An opening and closing furnace door is provided on the side wall of the melting furnace 21.

[0064] Both the first igniter and the second igniter are ceramic igniters. Embodiment

[0065] An aluminum ingot melting device includes a gas system 1 and a melting system 2;

[0066] 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 communicated with the first gas cylinder 13, and the second inlet 112 is communicated with 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 communicated with the first gas cylinder 13, and the fifth inlet 122 is communicated with the outside; the first gas cylinder 13 contains compressed natural gas;

[0067] The melting system 2 includes a melting furnace 21, a melting pool 22, a first igniter, a second igniter, and a suction 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 communicated with the melting pool 22, and the side of the bottom of the melting space 211 away from the melting pool is the higher side; the space where the melting space 211 is communicated with the melting pool 22 is a closed space; a plurality of first combustion ports 213 are provided 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; second combustion ports 221 are provided below the melting pool 22 and on the outer periphery of the side wall, and the second combustion ports 221 are communicated with the second outlet 123; the second igniter is arranged at the second combustion port 221; a recovery port 214 is provided on the cover 212, and the recovery port 214 is communicated with the second gas cylinder 14 through the suction pump 23;

[0068] When the aluminum ingot 3 melting device works, open the cover body 212, pour multiple aluminum ingots 3 into the melting space 211, then cover the cover body 212. At the same time, turn off the air extraction pump 23, connect the first inlet 111 and the second inlet 112 of the first mixing valve 11, start the blower 15 and ignite the first igniter, quickly heat the aluminum ingots 3 in the melting space 211 to the first temperature (for example, 500 °C, and of course, it can also be adjusted according to the type and quantity of the aluminum ingots 3). When reaching the first temperature, the aluminum ingots 3 are in an unmelted state. After reaching the first temperature, keep the first igniter in the off state and the first mixing valve 11 disconnect the second inlet 112 so that the unburned compressed natural gas is directly blown towards the aluminum ingots 3 through the first combustion port 213, causing the aluminum ingots 3 to crack due to cooling or the oxide layer to crack. After cooling for a predetermined time, the first mixing valve 11 closes the first inlet 111. At the same time, turn on the air extraction pump 23 to pump the 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, starts the blower 15 and the first igniter ignites again to heat the aluminum ingots 3 with surface cracks to melting; at the same time, start the fourth inlet 121 and the fifth inlet 122 of the second mixing valve 12, and start the second igniter to ignite the second combustion port 221 for heat preservation; when the melting of the aluminum ingots 3 is completed, the first mixing valve 11 and the blower 15 are turned off.

[0069] The blower 15 includes an air inlet and an air outlet, and the air outlet is communicated with the second inlet 112;

[0070] A first filter is provided on the air inlet.

[0071] There is a second filter 215 between the recovery port 214 and the air extraction pump 23.

[0072] The melting system 2 further includes a first temperature sensor and a second temperature sensor. The first temperature sensor is located in the melting space 211, and the second temperature sensor is located in the melting pool 22;

[0073] The aluminum ingot 3 melting device further 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, and of course, it can also be adjusted according to the type and quantity of the aluminum ingots 3) and / or the second temperature sensor exceeds the first range (for example, 700 °C - 750 °C, as long as it can maintain a liquid state), the alarm gives an alarm.

[0074] The first temperature and the second temperature are obtained through the first temperature sensor; the first range is obtained through the second temperature sensor.

[0075] An opening and closing furnace door is provided on the side wall of the melting furnace 21.

[0076] Both the first igniter and the second igniter are ceramic igniters.

[0077] The above are only embodiments of the present invention, and thus do not limit the patent scope of the present invention. Any equivalent transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. An aluminum ingot melting device, characterized in that, It includes a gas system and a melting system; The gas system includes 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 communicated with the first gas cylinder, and the second inlet is communicated with the blower to suck in air; the second mixing valve includes a fourth inlet, a fifth inlet, and a second outlet, the fourth inlet is communicated with the first gas cylinder, and the fifth inlet is communicated with 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 air extraction pump. The melting furnace has a melting space, the top of the melting space has a cover, the bottom of the melting space is inclined and communicated with the melting pool, and the side of the bottom of the melting space away from the melting pool is the higher side; the space where the melting space is integrally communicated with the melting pool is a closed space; a plurality of first combustion ports are provided 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 reaching the first temperature, the aluminum ingot is in an unmelted state. After reaching the first temperature, the first igniter is kept closed and the second inlet of the first mixing valve is disconnected, so that the unburned compressed natural gas is directly blown towards the aluminum ingot through the first combustion port, causing the aluminum ingot to crack due to cooling or the oxide layer to crack; a recovery port is provided on the cover, and the recovery port is communicated with the second gas cylinder through the air extraction pump.

2. The aluminum ingot melting device according to claim 1, wherein, The melting system further includes a second igniter. Second combustion ports are provided below the melting pool and on the outer periphery of the side wall, and the second combustion ports are 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, wherein, The first mixing valve is further provided with a third inlet, and the third inlet is communicated with the second gas cylinder; a flow regulator, a natural gas metering sensor, and an air flow sensor are provided on the first mixing valve. When the third inlet is in a connected state, the flow regulator calculates the ratio of natural gas and air through the natural gas metering sensor and the air flow sensor, and then negatively feedback regulates the opening degrees of the first inlet and the second inlet.

4. The aluminum ingot melting device according to claim 1, characterized in that, The blower includes an air inlet and an air outlet, and the air outlet is communicated with the second inlet; A first filter is provided 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 extraction pump.

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

7. The aluminum ingot melting device according to claim 1, wherein The melting system further includes a first temperature sensor and a second temperature sensor. 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 further 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 range, the alarm gives an alarm.

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

9. The aluminum ingot melting device according to claim 1, wherein, An openable furnace door is provided on the side wall of the melting furnace.

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

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