Device for making molten metal for casting

Claim 2

Apparatus for melting metal for casting, comprising a base; a vessel receiving cold starting material and flux material therein; a framework fixedly holding said vessel while being movably supported by said base; a continuously cooled vertical injector means disposed directly above said vessel and mixing separately delivered fuel-gas and oxygen-rich-gas at the lower end of the injector means, which injector means burns the fuelgas-oxygen mixture so formed and directs a flame of the mixture into the vessel; a fluid blower disposed adjacent said injector means and producing a fluid curtain between the flame of the fuel-gas-oxygen mixture and the inner surface of the vessel, so as to surround the flame; a driving means; and a transmission means operatively connected to the driving means and adapted to translate the framework together with the vessel along a closed path, so as to cause the starting material and flux in the vessel to rotate therein about an axis which is offset from the central axis of the vessel.

Claim 3

Apparatus as claimed in claim 1, said continuously cooled vertical injector means comprising concentric cylindrical tubes including a central tube having a throttle at the lower end thereof; a second tube surrounding the central tube; a third tube surrounding the second tube; a fourth tube surrounding the third tube and having a first compartment adjacent the third tube for carrying cold water for cooling the central, second, and third tubes, and a second compartment communicating with said first compartment for returning the cooling water after cooling the tubes enclosed by the fourth tube; a fifth tube forming said fluid blower; and a combustion chamber disposed immediately below the lower opening of said throttle of said central tube and communicating with said second and third tubes through holes bored at the lower ends thereof, said fourth tube being extended downward so as to surround the combustion chamber while forming a continuously cooled bottom surface of the injector means.

Claim 4

Apparatus as claimed in claim 2, said first and third tubes carrying the fuel-gas, said second tube carrying the oxygen-rich gas.

Claim 5

Apparatus as claimed in claim 2, said first and third tubes carrying the oxygen-rich-gas, said second tube carrying the fuel-gas.

Claim 6

Apparatus as claimed in claim 2, said first and second tubes carrying the fuel-gas, said third tube carrying the oxygen-rich-gas.

Claim 7

Apparatus as claimed in claim 1, said continuously cooled vertical injector means comprising a plurality of vertical injector elements; said fluid blower comprising a loop-shaped belt-like fluid tank which holds said vertical injector elements so as to enclose all the injector elements within the loop of the tank, said vertical injector elements being disposed in symmetry with each other with respect to the central axis of the vessel; each of the projector elements including a central tube having a throttle at the lower end thereof, a second tube surrounding the central tube, a third tube surrounding the second tube, a fourth tube surrounding the third tube and having a first compartment adjacent the third tube for carrying water for cooling the central, second, and third tubes, and a second compartment communicating with said first compartment for returning the cooling water after cooling the tubes enclosed by the fourth tube, and a combustion chamber disposed immediately below the lower opening of said throttle of the central tube and communicating with said second and third tubes through holes bored at the lower ends thereof, said fourth tube being extended downward so as to surround the combustion chamber while forming a continuously cooled bottom surface of the injector.

Claim 8

Apparatus as claimed in cLaim 6, said first and third tubes of each injector element carrying the fuel-gas, said second tube thereof carrying the oxygen-rich gas.

Claim 9

Apparatus as claimed in claim 6, said first and third tubes of each injector element carrying the oxygen-rich gas, the second tube thereof carrying the fuel-gas.

Claim 10

Apparatus as claimed in claim 6, said first and second tubes of each injector element carrying the fuel-gas, said third tube thereof carrying the oxygen-rich-gas.

Claim 11

Apparatus as claimed in claim 1, said transmission comprising a supporting means including support cylinders secured to the base, a rotary member rotatably carried by said support cylinders, an eccentric shaft connected to said rotary member and secured to said framework, said rotary member being rotated by said driving means, whereby in response to the rotation of the rotary member the vessel is translated together with the framework.

Claim 12

Apparatus as claimed in claim 1, said transmission comprising a plurality of supporting means, including support cylinders secured to the base, a plurality of rotary members each being rotatably fitted in one of said support cylinders, respectively, eccentric shafts each connected to each of the rotary shafts while being secured to said framework, selected one of said rotary members being rotated by said driving means, whereby in response to the rotation of the selected rotary member the vessel is translated together with the framework.

Claim 13

Apparatus as claimed in claim 10, there being a gap between the base and the rotary cylinder, and a gap between the rotary member and the framework.

Claim 14

Apparatus as claimed in claim 11, there being gaps between each of the bases and each of the rotary cylinders, and gaps between each of the rotary members and the framework.

Claim 15

Apparatus as claimed in claim 1, the inner surface of said vessel being lined with chamotte.

Claim 16

Apparatus as claimed in claim 1, and a heat-insulating plate secured to the bottom of the vessel and a plurality of pneumatic bearing chambers inserted between the heat-insulating plate at the bottom of the vessel and the base, whereby a large portion of the weight of materials in the vessel is borne by the pneumatic bearing chambers in a movable manner.