GB2112658A

GB2112658A - A nonferrous metal recovering device

Info

Publication number: GB2112658A
Application number: GB08200057A
Authority: GB
Inventors: Masaji Kuchimura; Motohisa Takasoh
Original assignee: IKUNO KEIKINZOKU KK
Current assignee: IKUNO KEIKINZOKU KK
Priority date: 1982-01-04
Filing date: 1982-01-04
Publication date: 1983-07-27
Also published as: AU7968182A

Abstract

A container (2) for molten metal is provided with upper and lower counter-rotating blades (5 and 6) rotatable about a common vertical axis for stirring the molten metal without causing the molten metal from rising up the wall of the container as a result of centrifugal force. <IMAGE>

Description

SPECIFICATION Nonferrous metal recovering device The present invention is related to the improvement of a rotary agitating blade which agitates metal dreg to be produced inside a recovering container in the nonferrous metal recovering device for separating metal and ashes from the metal dreg to be produced in the course of melting such nonferrous metals as aluminum, zinc, lead, tin, etc. in a melting furnace.

In the conventional nonferrous metal recovering device, the metal dreg which has been produced in the melting furnace is taken into a recovering container installed at the bottom of the device and is added separating solvent; then the mixture is agitated by a rotary agitating blade for separating melted metal from ashes, as the result of which the ashes come up to the surface and the melted metal flows out from the bottom.

When executing agitation by using a single rotary agitating blade as mentioned above and when the speed of its rotation is increased gradually from an initial low speed to a higher speed, the melted metal particles contained in the metal dreg tend to move toward the inner surface of the recovering container by centrifugal force and precipitate along the inner surface to cause an accumulation of the melted metal at the bottom of the recovering container.Here, the device has such a defect that when the speed of rotation of the agitating blade reaches to a certain degree, the melted metal which has accumulated at the bottom of the recovering container and which is agitated there by the rotary agitating blade and the metal dreg which floats there upon starts to rotate in concert with the rotation of the agitaing blade, consequently bringing the agitation effect of the rotary agitating blade to naught.

Aiming at eliminating the abovementioned defect regarding the rotation of the accumulated melted metal in concert with the rotation of the agitating blade, the present invention has the structure that another rotary agitating blade is fixed above the main agitating blade in such manner that it rotates in an opposite direction to the rotation of the main agitating blade and that both blades are mounted on the same shaft.

Apparatus embodying the invention is diagrammatically illustrated by way of example, in accompanying drawings, in which: Figure 1 shows a front view of the recovering device as per the present invention; Figure 2 shows its back view; Figure 3 shows a right side view of Fig. 1; Figure 4 shows a plane view of a device as per the present invention; Figure 5 shows a magnified front view, showing the state in which a main rotary shaft and a hexagonal rotary hollow shaft have come down; and Figure 6 shows a magnified front view, showing the state in which a main rotary shaft and a hexagonal rotary hollow shaft have been pulled up.

Referring to the drawings, a fork lift frame 4 is installed at the bottom of a recovering container 2 which is fixed inside the recovering device 1 and thereby it becomes possible by using a fork lift to rotate and move the recovering container 2 quickly while it is hot; a flange plate which is fixed to the upper end of the recovering container 2 is made in such shape that it can closely contact with the furnace wall of a metal dreg scrape-out opening of a melting furnace and is also made in such area as being large enough to prevent the metal dreg from spilling and thereby it becomes possible to take the metal dreg into the recovering container 2 direct from the melting furnace quickly and easily; a fit-in hole is provided in the middle of one side of the flange plate 3 and a fit-in boss, a horizontal guide boss, etc. are fixed onto the recovering container stand 1' of the recovering device 1 and thereby it becomes possible to place the recovering container 2 containing the metal dreg at a specific position inside the recovering device 1 quickly and horizontally; the lower part of the heat-insulating wall which covers the circumference of the recovering device 1 is held in an open state so that it becomes possible to execute the work for recovering nonferrous metal while observing with the unaided eye the state of the metal dreg agitated by the rotary agitating blade installed in the recovering container 2; a reverse agitating blade 6 which is of the shape that loosely fits the inner upper part of the recovering container 2 at a position being above the main agitating blade 5 is mounted on the same shaft as is mounted the main agitating blade 5 and is arranged to rotate in an opposite direction to the rotation of the main agitating blade. Thus, the agitation of the metal dreg can be done sufficiently by eliminating such defect that the melted metal having accumulated in the recovering container 2 and the metal dreg floating thereabove start to rotate in the same direction as the rotation of the main agitating blade 5, bringing the agitation effect to naught.

The structure such as mounting the main agitating blade 5 and the reverse agitating blade 6 on the same shaft and yet rotating them in an opposite to each other is material ized in the following way. A hexagonal rotary hollow shaft 6' of a specific length, to the lower end of which a reverse agitating blade 6 is to be mounted, is put on the circumference of the lower end of a main rotary shaft 5', to the lower end of which a main agitating blade 5 is to be fixed, in such manner as the former being independent from the latter through several thrust bearings 7 and also being free to rotate; lids 8, 8' are put on the upper and lower ends of the hexagonal rotary hollow shaft 6' in such manner as they come into contact with the outside of the thrust bearings 7; the upper end of the hexagonal rotary shaft 6' is inserted in a rotate-free manner into a hexagonal fitting hole in the center of a sprocket 11 which is provided on the middle stage of the recovering device 1 and is connected by a slip-joint system; the sprocket 11 is rotated by a motor 1 2 through chains 9, 9'; two flanges 20 are fixed at a specific interval onto a position being a little upper than the upper end of the hexagonal rotary hollow shaft which is mounted on the lower end of the main rotary shaft 5'; a pulling ring 14 is put on the main rotary shaft 5' in a position between the two flanges 20 and in a rotatefree manner; pulling edges 14', 14' projecting from both sides of the pulling ring 14 is connected with endless chains 17, 1 7 which are put on the upper and lower sprockets 15, 15, 16, 1 6 provided in the recovering device 1; the upper sprocket 15, 1 5 are rotated by either a manual handle 1 8 or or a motor 1 9 to pull up and down both the main rotary shaft 5' and the hexagonal rotary hollow shaft 6' at the same time by the endless chains 17, 1 7 which are the same system as that which is conventinally adopted to put up and down a single rotary agitating blade; a part of the main rotary shaft 5' of the same length as the length of the hexagonal shaft 6' measured from the point where the two flanges are fixed is made a spline shaft 5"; the upper end of the spline shaft 5" is inserted in a vertically slide-free manner into a hole provided in the center of a bevel gear 10 which is fixed in a rotatefree manner to the upper end of the recovering device 1 and is connected by a slip-joint system so that both main rotary shaft 5' and the hexagonal hollow rotary shaft 6' can go up and down freely; a bevel gear 10 is rotated by a motor 1 3 through a sprocket 22; the main agitating blade 5 fixed to the main rotary shaft 5' and the reverse agitating blade 6 fixed to the hexagonal rotary hollow shaft 6' are rotated independently from each other and in an opposite direction to each other by motors 1 2 and 1 3 respectively; and the main agitating blade 5 and the reverse agitating blade 6 are under such arrangement that at the time when they stop rotation, they are raised by the endless chains 17, 1 7 to a position where they do not disturb the work for mounting or dismounting the recovering container 2.

The structure that the reverse agitating blade 6 which rotates in an opposite direction to the rotation of the main agitating blade 5 is fixed above the main agitating blade 5 makes it possible to produce satisfactory results with out presenting such phenomenon that when the melted metal is accumulated considerably at the bottom of the recovering container 2, the melted metal and the metal dreg start to rotate in the same direction as the rotation of the main agitating blade 5 and thus it becomes possible to increase the rate of recovery of the melted metal by about 20% comparing with the case in which the main agitation blade alone is used.

Claims

A nonferrous metal recovering device, which is characterized by fixing main agitating blade to the lower end of main rotary shaft mounting a hexagonal rotary hollow shaft on the outside of a specific length of lower part of the main rotary shaft through several thrust bearings, covering both ends of the hexagonal rotary hollow shaft with lids holding the hexagonal rotary hollow shaft in such manner as being independent from the main rotary shaft and also being free to rotate, fixing a reverse agitating blade to the lower end of the hexagonal rotary hollow shaft in such manner as being situated above the main agitating blade, connecting the upper end of the main rotary shaft with a shaft hole provided in the center of a bevel gear to be rotated by a motor and also connecting the upper end of the hexagonal rotary hollow shaft with a hexagonal shaft hole provided in the center of a sprocket to be rotated by a motor respectively by a slip-joint system, mounting the main agitating blade above and the reverse agitating blade below on the same shaft in such manner as being independent from each other and being free to rotate.