Circulation type nonferrous metal melting furnace

Abstract

To efficiently pump out molten metal while preventing the breakage of electric heaters.SOLUTION: A first warming chamber 12, a second warming chamber 13 and a tapping chamber 14 are respectively provided with a first electric heater 30, a second electric heater 40 and a third electric heater 60. A nonferrous metallic material is fed from a feed port 11 and is warmed to a prescribed first temperature in the first warming chamber 12 so as to be molten metal. A part of the molten metal warmed to the first temperature is received in the tapping chamber 14, and the remaining molten metal is received in the second warming chamber 13, is warmed to a second temperature exceeding the first temperature by the second electric heater 40 and is circulated to the first warming chamber 12. The heat of the molten metal circulated to the first warming chamber 12 is given to the nonferrous metallic material newly fed from the feed port 11. A weir part 100 is erected at a part connecting a space between the first warming chamber 12 and the second warming chamber 13 and the tapping chamber 14, and a part of the molten metal is allowed to overflow via the weir part 100 and flow to the side of the tapping chamber 14.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a circulating non-ferrous metal melting furnace that melts non-ferrous metals such as aluminum alloys while circulating them for the purpose of using them in the production of various cast products such as die-casting.

Background Art

[0002] Conventionally, for melting non-ferrous metals such as aluminum alloys, melting furnaces using radiant flames from gas burners using fossil fuels such as petroleum have been mainly adopted. However, since the radiant flames from gas burners using fossil fuels have problems in terms of thermal efficiency and the environment, improvement measures have been demanded.

[0003] As an improvement measure, a non-ferrous metal melting furnace having a structure in which an electric heater is immersed in the molten metal has been disclosed (see, for example, Patent Document 1). As shown in FIG. 5, the non-ferrous metal melting furnace 50 described in this Patent Document 1 is provided with a plurality of chambers including a melting chamber 51, a heating chamber 52, and a slag removal chamber 53. The non-ferrous metal material charged into the melting chamber 50 is melted by an electric heater 56 provided in the heating chamber 52 and heated to a predetermined temperature, and then supplied from there to a hot water chamber 55 through a calming chamber 54. The molten metal circulates from the slag removal chamber 53 to the heating chamber 52, but no electric heater is provided in this slag removal chamber 53.

[0004] Since this non-ferrous metal melting furnace 50 uses an electric heater to melt and heat the non-ferrous metal material, it has a great advantage of being superior in terms of thermal efficiency and the environment compared to the conventional melting furnace using a gas burner.

[0005] However, the present inventors have not been satisfied with such a situation and have further advanced research and development, and have developed a circulating non-ferrous metal melting furnace that can melt and heat non-ferrous metal materials more efficiently with a novel configuration that has not existed so far (Patent Document 2).

[0006] As shown in Fig. 6, this cyclic non-ferrous metal melting furnace 101 includes an inlet 111 for non-ferrous metal materials, a first heating chamber 112 communicating with the inlet 111, a second heating chamber 113 arranged in parallel with the first heating chamber 112 via an intermediate wall 115, and forming a circulation path through which the molten metal circulates with the first heating chamber 112, a tapping chamber 114 communicating with the downstream side of the first heating chamber 112 between the first heating chamber 112 and the second heating chamber 113, for receiving a part of the molten metal heated to a predetermined temperature in the first heating chamber 112 and capable of taking out the molten metal, a furnace body 110, a circulation pump 120 for circulating the molten metal, a plurality of first electric heaters 130 provided in the first heating chamber 112 for heating the molten metal to a predetermined first temperature, and a plurality of second electric heaters 140 provided in the second heating chamber 113 for heating the molten metal heated to the first temperature in the first heating chamber 112 to a second temperature exceeding the first temperature. The molten metal heated to the second temperature in the second heating chamber 113 is circulated to the first heating chamber 112 to supply its heat to the non-ferrous metal materials introduced from the inlet 111. A partition wall 117 is provided between the first heating chamber 112 and the tapping chamber 114, and a communication passage 117a is formed in this partition wall 117 to communicate the first heating chamber 112 with the tapping chamber 114. The tapping chamber 114 is provided with a mechanism (not shown) for taking out the received molten metal to the outside.

[0007] According to this, the molten metal is circulated by the circulation pump 120 in the circulation path formed by the first heating chamber 112 and the second heating chamber 113. A part of the molten metal heated to a predetermined temperature (first temperature) by the first electric heater 130 in the first heating chamber 112 is received in the tapping chamber 114, and the molten metal from the first heating chamber 112 is heated to a temperature (second temperature) exceeding the predetermined temperature by the second electric heater 140 in the second heating chamber 113 and then circulated to the first heating chamber 112. Thus, the non-ferrous metal materials introduced from the inlet 111 into the first heating chamber 112 can be effectively melted and heated.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

[0009] However, since the circulation-type non-ferrous metal melting furnace 101 shown in FIG. 6 does not actively perform temperature control in the hot water chamber 114, the inventors of the present invention believe that if the temperature information in the hot water chamber 114 can be used well, the non-ferrous metal material can be melted and heated more efficiently. Therefore, the inventors have come up with the idea of providing an electric heater (third electric heater) also in the hot water chamber 114.

[0010] Here, when the first heating chamber 112, the second heating chamber 113 and the hot water chamber 114 are connected to communicate with each other through an opening of about several hundred millimeters from the floor surface, that is, when a partition wall is provided between the first heating chamber 112, the second heating chamber 113 and the hot water chamber 114, and an opening is provided in the partition wall from the floor surface, when a certain amount of molten metal is pumped out from the hot water chamber 114, at that timing, the molten metal moves through the opening from the side of the first heating chamber 112 and the second heating chamber 113 to the side of the hot water chamber 114. On the other hand, if the heating part of the electric heater is not surely immersed in the molten metal, it will be damaged immediately. In addition, if an oxide of the molten metal adheres to the surface of the heating part, the electric heater may malfunction due to overheating. In particular, oxides of the molten metal tend to adhere to the surface of the molten metal. Therefore, when pumping out the molten metal from the hot water chamber 114, it is necessary to pay careful attention so that the heating part of the electric heater is not exposed on the side of the first heating chamber 112 and the second heating chamber 113 or on the side of the hot water chamber 114. In addition, since the amount of the molten metal pumped out from the hot water chamber 114 is constant, there is also a problem that the amount cannot be changed so that the heating part of the electric heater is not exposed.

[0011] Therefore, an object of the present invention is to provide a circulation-type non-ferrous metal melting furnace capable of efficiently pumping out molten metal while preventing damage to the electric heater.

Means for Solving the Problem

[0012] In order to achieve the above object, the present invention is a circulating non-ferrous metal melting furnace (1) that melts non-ferrous metal materials using an electric heater, comprising: an inlet (11) for the non-ferrous metal material, a first heating chamber (12) communicating with the inlet (11), a second heating chamber (13) arranged in parallel with the first heating chamber (12) via an intermediate wall (15) and forming a circulation path through which the molten metal circulates with the first heating chamber (12), and a furnace body (10) having a tapping chamber (14) that communicates between the first heating chamber (12) and the second heating chamber (13) and on the downstream side of the first heating chamber (12) or the upstream side of the second heating chamber (13) to receive a part of the molten metal heated to a predetermined temperature in the first heating chamber (12) and capable of taking out the molten metal; a circulation pump (20) provided in the first heating chamber (12) or the second heating chamber (13) or both to circulate the molten metal; a first electric heater (30) provided in the first heating chamber (12) to heat the molten metal to a predetermined first temperature; a second electric heater (40) provided in the second heating chamber (13) to heat the molten metal heated to the first temperature in the first heating chamber (12) to a second temperature exceeding the first temperature; comprising a third electric heater (60) provided in the tapping chamber (14); the molten metal heated to the second temperature in the second heating chamber (13) is circulated to the first heating chamber (12) to supply its heat to the non-ferrous metal material introduced from the inlet (11); a weir portion (100) is erected from the floor surface at a portion communicating between the first heating chamber (12) and the second heating chamber (13) and the tapping chamber (14), and a part of the molten metal is overflowed through the weir portion (100) and flowed to the tapping chamber (14) side.

[0013] Moreover, the present invention is characterized in that, in the weir portion (100), the positions (100H, 103H) where the molten metal overflows are set higher than the heat generating portions (31, 41) of the first electric heater (30) and the second electric heater (40).

[0014] Further, the present invention is characterized in that the upper limits (61U) of the heat generating portions (61) of the third electric heater (60) are set lower than the upper limits (31U, 41U) of the heat generating portions (31, 41) of the first electric heater (30) and the second electric heater (40).

[0015] Moreover, the present invention is characterized in that the upper limits (31U, 41U) of the heat generating portions (31, 41) of the first electric heater (30) and the second electric heater (40) are below the upper limit level (14U) of the molten metal in the hot water outlet chamber (14), and the upper limit (61U) of the heat generating portion (61) of the third electric heater (60) is below the lower limit level (14D) of the molten metal in the hot water outlet chamber (14).

[0016] Furthermore, the present invention is characterized in that the non-ferrous metal material is aluminum or an aluminum alloy.

[0017] Note that the symbols in the parentheses above indicate the corresponding elements or corresponding matters described in the drawings and the embodiments for carrying out the invention described later.

Effects of the Invention

[0018] According to the present invention, a first heating chamber provided with a first electric heater and a second heating chamber provided with a second electric heater are arranged side by side with an intermediate wall therebetween to form a molten metal circulation path. An inlet for a non-ferrous metal material is provided on one end side of the intermediate wall between the first heating chamber and the second heating chamber, and on the other end side of the intermediate wall, a portion communicating with a hot water outlet chamber provided with a third electric heater and capable of taking out the molten metal is provided. In a circulating non-ferrous metal melting furnace having a small volume and an extremely large melting capacity not found in the prior art, which is configured to circulate the molten metal through a circulation pump, a weir portion is erected from the floor surface at a portion communicating between the first heating chamber and the second heating chamber and the hot water outlet chamber, and a part of the molten metal is made to overflow through the weir portion and flow to the hot water outlet chamber side, so that the molten metal levels on the first heating chamber and second heating chamber sides can be made constant.

[0019] Thereby, at the weir portion, by setting the position where the molten metal overflows to a position higher than the heat generating portions of the first electric heater and the second electric heater, it is possible to surely prevent the heat generating portions from being exposed outside the molten metal structurally. Therefore, events such as damage or failure of the first electric heater or the second electric heater can be prevented.

[0020] Also, regarding the third electric heater provided on the hot water outlet chamber side, by setting the upper limit of the heat generating portion of the third electric heater to a lower position than the upper limit of the heat generating portions of the first electric heater and the second electric heater, it is possible to prevent the heat generating portion of the third electric heater from being exposed outside the molten metal.

[0021] Also, according to the present invention, the upper limit of the heat generating portions of the first electric heater and the second electric heater is below the upper limit level of the molten metal in the hot water outlet chamber, and the upper limit of the heat generating portion of the third electric heater is set below the lower limit level of the molten metal in the hot water outlet chamber. Therefore, it is possible to prevent the respective heat generating portions of the first, second, and third electric heaters from being exposed outside the molten metal.

[0022] In addition, according to the present invention, since the non-ferrous metal material is aluminum or an aluminum alloy, various casting products using aluminum can be favorably manufactured.

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0024] With reference to the drawings, a cyclic non-ferrous metal melting furnace 1 according to an embodiment of the present invention will be described.

[0025] The cyclic non-ferrous metal melting furnace 1 according to the present embodiment, as shown in FIGS. 1 and 2, while circulating the molten metal, immerses an electric heater with the exception of its upper end portion in the molten metal, and uses its heat to melt and raise the temperature of the non-ferrous metal material. It includes a furnace body 10, a circulation pump 20, a first electric heater 30, a second electric heater 40, a third electric heater 60, and thermometers T1 to T11.

[0026] The furnace body 10 has a substantially rectangular planar shape formed by a furnace wall 10a, and includes an inlet 11 for non-ferrous metal materials, a first heating chamber 12, a second heating chamber 13, and a tapping chamber 14 from which the molten metal can be taken out. Note that the planar shape of the furnace body 10 is not limited to a rectangular shape.

[0027] The charging port 11 is provided on the downstream side of the second heating chamber 13. The first heating chamber 12 is provided in communication with the charging port 11 and receives the non-ferrous metal material charged from the charging port 11. The second heating chamber 13 is arranged side by side with the first heating chamber 12 via an intermediate wall 15 and forms a circulation path through which the molten metal circulates with the first heating chamber 12.

[0028] The molten metal outlet chamber 14 is provided at a position opposite to the charging port 11 via a diversion channel 18 provided so as to communicate with the upstream side of the second heating chamber 13. Between the first heating chamber 12 and the second heating chamber 13 and the diversion channel 18, except for a weir portion 100 erected from the floor surface so as to overflow a part of the molten metal from the upstream side of the second heating chamber 13, they are partitioned by a partition wall 17. A degassing device 70 that generates an inert gas to adsorb aluminum dross and float it on the upper surface of the molten metal is attached to the diversion channel 18. The aluminum dross is scraped out manually. This molten metal outlet chamber 14 is provided with a mechanism (not shown) for taking out the received molten metal to the outside. Between the first heating chamber 12 and the second heating chamber 13, the charging port 11 for the non-ferrous metal material is provided on one end side of the intermediate wall 15, and on the other end side of the intermediate wall 15 between the first heating chamber 12 and the second heating chamber 13, a weir portion 100 for overflowing a part of the molten metal into the molten metal outlet chamber 14 is provided as shown in Fig. 3.

[0029] Gap channels 16 (a first gap channel 16a and a second gap channel 16b) are formed between the both end portions of the intermediate wall 15 and the furnace wall 10a and the partition wall 17 facing them respectively. Therefore, the circulation path is formed in the order of the upstream side (charging port 11), the first gap channel 16a, the first heating chamber 12, the second gap channel 16b, and the second heating chamber 13.

[0030] The circulation pump 20 is provided on the downstream side of the second heating chamber 13 and circulates the molten metal along the circulation path. Note that the installation location and number of the circulation pump 20 are not limited. Therefore, it can be provided in the first heating chamber 12, or can also be provided in both the first heating chamber 12 and the second heating chamber 13.

[0031] The first electric heater 30 is provided in the first heating chamber 12 and heats the molten metal to a predetermined first temperature. A total of 11 first electric heaters 30 are provided in this embodiment, but this number is not limited and a single one may be used. The second electric heater 40 is provided in the second heating chamber 13 and heats the molten metal heated to the first temperature in the first heating chamber 12 to a second temperature exceeding the first temperature. A total of 6 second electric heaters 40 are provided in this embodiment, but this number is not limited and a single one may be used. The third electric heater 60 is provided in the hot water outlet chamber 14 and heats the temperature of the molten metal in the hot water outlet chamber 14. A total of 4 third electric heaters 60 are provided in this embodiment, but this number is not limited and a single one may be used.

[0032] The first electric heater 30, the second electric heater 40, and the third electric heater 60 are respectively connected to a heating part 31, 41, 61 provided on the lower side and an electrode part 32, 42, 62 provided on the upper side.

[0033] Here, the upper limit 61U of the heating part 61 of the third electric heater 60 is set at a lower position than the upper limits 31U, 41U of the heating parts 31, 41 of the first electric heater 30 and the second electric heater 40. In addition, in the weir part 100, the position 100H of the upper surface where the molten metal overflows is set at a position higher than the heating parts 31, 41 of the first electric heater 30 and the second electric heater 40, so that the heating parts 31, 41 of the first electric heater 30 and the second electric heater 40 are not exposed from the molten metal structurally.

[0034] Furthermore, the upper limits 31U, 41U of the heating parts 31, 41 of the first electric heater 30 and the second electric heater 40 are below the upper limit level 14U of the molten metal in the hot water outlet chamber 14, and the upper limit 61U of the heating part 61 of the third electric heater 60 is below the lower limit level 14D of the molten metal in the hot water outlet chamber 14.

[0035] The thermometers T1 to T11 are thermocouple-type sensors, which are respectively provided in the first heating chamber 12, the second heating chamber 13, and the hot water outlet chamber 14 to measure the temperature of the molten metal. The number of these is not limited either.

[0036] Note that the non-ferrous metal in this embodiment is an aluminum alloy. Also, the first temperature is set to 650°C to 720°C, which is suitable for casting casting products, for the molten aluminum alloy. Further, the second temperature is set to 750°C, and by utilizing the heat of the molten metal that is approximately 100°C higher than the first temperature, the non-ferrous metal introduced from the inlet 11 is efficiently melted and heated up in a short time. Note that the first temperature and the second temperature can be changed depending on the type of non-ferrous metal to be melted and heated, the amount of melting per unit time, and so on.

[0037] According to the circulating non-ferrous metal melting furnace configured as described above, the molten metal is circulated by the circulation pump 20 in the circulation path formed by the first heating chamber 12 and the second heating chamber 13, and a part of the molten metal heated to a predetermined temperature (the first temperature) by the first electric heater 30 in the first heating chamber 12 is received in the hot water outlet chamber 14. Also, the molten metal from the first heating chamber 12 is heated to a temperature exceeding the predetermined temperature (the second temperature) by the second electric heater 40 in the second heating chamber 13 and then circulated to the first heating chamber 12. Therefore, the non-ferrous metal material introduced from the inlet 11 into the first heating chamber 12 can be efficiently melted and heated up.

[0038] That is, the molten metal heated to the second temperature (having a temperature higher than the first temperature) is used to melt the non-ferrous metal material introduced into the first heating chamber 12 and heat it up to the first temperature. Therefore, this non-ferrous metal material can be efficiently melted in a short time and heated up to the molten metal at a predetermined temperature. Also, since a third electric heater is provided in the hot water outlet chamber 14 as well, a circulating non-ferrous metal melting furnace with even better temperature control can be obtained.

[0039] And, at the portion connecting the first heating chamber 12 and the second heating chamber 13 and the hot water outlet chamber 14, a weir portion 100 is erected from the floor surface, and a part of the molten metal is made to overflow over the upper surface 100H of the weir portion 100 and flow to the hot water outlet chamber 14 side, so that the molten metal levels on the first heating chamber 12 and the second heating chamber 13 sides can be made constant.

[0040] Also, in the weir portion 100, since the position where the molten metal overflows is set higher than the heating portions 31, 41 of the first electric heater 30 and the second electric heater 40, structurally, it is possible to surely prevent the heating portions 31, 41 from being exposed outside the molten metal. Therefore, it is possible to prevent events such as the first electric heater 30 and the second electric heater 40 being damaged or malfunctioning.

[0041] Also, for the third electric heater 60 provided on the hot water outlet chamber 14 side, by setting the upper limit of the heating portion 61 of the third electric heater 60 lower than the upper limits of the heating portions 31, 41 of the first electric heater 30 and the second electric heater 40, it is possible to prevent the heating portion 61 of the third electric heater 60 from being exposed outside the molten metal.

[0042] Also, the upper limits 31U, 41U of the heating portions 31, 41 of the first electric heater 30 and the second electric heater 40 are below the upper limit level 14U of the molten metal in the hot water outlet chamber 14, and the upper limit 61U of the heating portion 61 of the third electric heater 60 is set below the lower limit level 14D of the molten metal in the hot water outlet chamber 14. Therefore, it is possible to prevent the respective heating portions 31, 41, 61 of the first, second, and third electric heaters 30, 40, 60 from being exposed outside the molten metal.

[0043] In the embodiment of the present invention, the inlet 11 for the non-ferrous metal material provided on the downstream side of the second heating chamber 13 (the first inlet 11) can also be provided with a second inlet 21 on the upstream side of the first heating chamber 12 as shown in FIG. 1. If the non-ferrous metal material inlets 11 and 21 are provided at two locations, the surface area of the non-ferrous metal material in contact with the circulating molten metal can be significantly increased, and the non-ferrous metal material can be efficiently melted.

[0044] Also, in the embodiment of the present invention, a weir portion 100 is provided upstream of the second heating chamber 13, and the molten metal is caused to flow into the hot water outlet chamber 14 through the weir portion 100. However, the present invention is not limited to this, and a weir portion 100 may be provided downstream of the first heating chamber 12, and the molten metal may be caused to flow into the hot water outlet chamber 14 through the weir portion 100. Further, the diversion passage 18 provided with the degassing device 70 may be omitted, and the molten metal exceeding the weir portion 100 may directly enter the hot water outlet chamber 14.

[0045] Further, in the present embodiment, as shown in FIG. 3, a structure is adopted in which a part of the molten metal flows over the upper surface 100H of the weir portion 100 on the hot water outlet chamber 14 side. However, as shown in FIG. 4, a hole 103 opened at the upper part of the weir portion 100 may be provided, and a part of the molten metal may flow through the hole 103 to the hot water outlet chamber 14 side. In this case, the position of the lower surface 103H of the hole 103 becomes the upper limit level of the molten metal on the first heating chamber 12 and second heating chamber 13 sides, and is higher than the upper limit level and higher than the heat generating portions 31 and 41 of the first electric heater 30 and second electric heater 40, so that the heat generating portions 31 and 41 of the first electric heater 30 and second electric heater 40 are not exposed from the molten metal structurally.

[0046] In the above embodiment of the present invention, an aluminum alloy is the object of melting and temperature raising, but other non-ferrous alloys can be the object. Further, the first temperature and the second temperature can be appropriately changed depending on the non-ferrous metal or the like to be targeted.

Description of Reference Numerals

[0047] 1 Circulating non-ferrous metal melting furnace 10 Furnace body 10a Furnace wall 11 Inlet (first inlet) 12 First heating chamber 13 Second heating chamber 14 Hot water outlet chamber 14U upper limit level 14D lower limit level 15 intermediate wall 16 gap path 16a first gap path 16b second gap path 17 partition wall 18 diversion path 20 circulation pump 21 second inlet 30 first electric heater 31 heating part 31U upper limit 32 electrode part 40 second electric heater 41 heating part 41U upper limit 42 electrode part 50 circulating non-ferrous metal melting furnace 51 melting chamber 52 heating-up chamber 53 slag removal chamber 54 calming chamber 55 hot water outlet chamber 56 electric heater 60 third electric heater 61 heating part 61U upper limit 62 electrode part 70 degassing device 100 weir part 100H upper surface of the weir part 101 circulating non-ferrous metal melting furnace 103 hole 103H lower surface of the hole 110 furnace body 110a furnace wall 111 inlet 112 first heating-up chamber 113 second heating-up chamber 114 hot water outlet chamber 115 intermediate wall 117 partition wall 117a gap path 120 circulation pump 130 first electric heater 140 second electric heater T1~T11 thermometer

Claims

1. A circulating non-ferrous metal melting furnace that uses an electric heater to melt non-ferrous metal materials, comprising an inlet for the non-ferrous metal material, a first heating chamber communicating with the inlet, a second heating chamber arranged in parallel with the first heating chamber via an intermediate wall and forming a circulation path through which the molten metal circulates with the first heating chamber, and a furnace body having a tapping chamber that communicates between the first heating chamber and the second heating chamber and is located on the downstream side of the first heating chamber or the upstream side of the second heating chamber to receive a part of the molten metal heated to a predetermined temperature in the first heating chamber and is capable of taking out the molten metal, a circulation pump provided in the first heating chamber or the second heating chamber or both to circulate the molten metal, a first electric heater provided in the first heating chamber to heat the molten metal to a predetermined first temperature, a second electric heater provided in the second heating chamber to heat the molten metal heated to the first temperature in the first heating chamber to a second temperature exceeding the first temperature, a third electric heater provided in the tapping chamber, wherein the molten metal heated to the second temperature in the second heating chamber is circulated to the first heating chamber to supply its heat to the non-ferrous metal material introduced from the inlet, and a weir is erected from the floor surface at a portion communicating between the first heating chamber and the second heating chamber and the tapping chamber, and a part of the molten metal is overflowed through the weir and flowed to the tapping chamber side. The circulating non-ferrous metal melting furnace is characterized by this.

2. The circulating non-ferrous metal melting furnace according to claim 1, wherein in the weir portion, the position where the molten metal is overflowed is set higher than the heat generating portions of the first electric heater and the second electric heater.

3. The circulating non-ferrous metal melting furnace according to claim 1 or 2, wherein the upper limit of the heat generating portion of the third electric heater is set at a lower position than the upper limit of the heat generating portions of the first electric heater and the second electric heater.

4. The circulating non-ferrous metal melting furnace according to claim 3, wherein the upper limit of the heat generating portions of the first electric heater and the second electric heater is below the upper limit level of the molten metal in the tapping chamber, and the upper limit of the heat generating portion of the third electric heater is below the lower limit level of the molten metal in the tapping chamber.

5. The circulating non-ferrous metal melting furnace according to claim 1 or 2, wherein the non-ferrous metal material is aluminum or an aluminum alloy.

Images