JPS63351Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a non-magnetic metal sorting device.

Conventionally, a device is known in which a moving magnetic field generating device is provided that generates a moving magnetic field in the direction opposite to the rotational direction of a cylinder having an inclined rotation axis, and only non-magnetic metal is separated in the direction of the moving magnetic field. In this case, since the rotating cylinder is manufactured from FRP, which is an electrical insulator, the elastic modulus of the material is small, and as shown in Figure 1, the elastic modulus of FRP material is 1/30 to 1/14 of that of mild steel. In this case, the rigidity of the cylinder becomes an issue. Increasing the wall thickness to obtain the necessary stiffness not only increases the weight of the cylinder, which is economically disadvantageous, but also increases the distance from the non-magnetic metal to the moving magnetic field generator, making it difficult to recover the non-magnetic metal. From this point of view, if a thin-walled cylinder is used, there is a risk that the cylinder will come into contact with the moving magnetic field generator due to deflection if more mixture than expected is put into the cylinder. On the other hand, when manufacturing a rotating cylinder made of FRP, which is suitable as an insulator, a cylindrical mold is generally prepared, and FRP is applied to the outer periphery of this mold using the hand wrap method.
molding. In this manufacturing method, the inner diameter of the rotating cylinder is determined according to the precision of the mold, and the
In the Up method, the accuracy of the outer diameter is not as high as that of the inner diameter.
In addition, it is difficult to improve accuracy by machining the outer diameter of a cylinder because the cylinder itself has low rigidity, and even if it is machined, material costs and processing costs will rise, so it is often not machined. Therefore, the outer periphery of the cylinder does not have a very good roundness, and in the case of the configuration of the present invention in which the rotating cylinder is supported by a roller and rotated, the rotating cylinder rotates eccentrically, and the gap with the moving magnetic field generator changes. If the gap is made larger, the distance to the non-magnetic metal becomes larger than necessary, resulting in a decrease in the recovery rate as described above. Further, when adopting a configuration in which the rotating cylinder is directly supported by rollers as in the present invention, repeated stress is generated in the cylinder, and it is necessary to have strength to withstand damage due to fatigue.

In the present invention, a flange is integrally formed at least on the upper edge of a rotating cylinder made of FRP, a metal ring is screwed to this flange, and the outer periphery of the metal ring can be freely rotated by a plurality of rollers. The above-mentioned drawbacks have been eliminated by the structure in which one of the rollers is supported by a roller and one of them is a driving roller.

An embodiment of the present invention will be described in detail below with reference to the drawings. In Fig. 2 and Fig. 3, industrial waste is dropped into the chute 2 below the left end of the conveyor 1 that conveys the industrial waste from which magnetic materials have been removed, and the white circles indicate non-magnetic metals and the black circles indicate non-metals. show. Industrial waste exiting the cylindrical portion 2a of the chute 2 enters a rotating cylinder 3 made of FRP and having an inclined axis of rotation.
A flange portion 3a is integrally formed on the upper end edge of this rotating cylinder 3 made of FRP, and a metal ring 4 having an L-shaped cross section is coupled to this flange portion 3a by screws 5. Since this metal ring 4 has been machined in advance, the roundness of the outer periphery is finished with sufficient accuracy, and when it is connected to the rotating cylinder 3 by adjusting it concentrically with the screw 5, it is shown in cross section in Fig. 3. When the metal ring 4 is rotated in one direction by a plurality of rollers 6 that rotatably support the outer periphery,
The rotating support part is a metal ring 4. Therefore, the thickness of the rotating cylinder 3 made of FRP can be reduced, and the weight can be reduced accordingly, making the entire device extremely inexpensive. Also, since it is not supported on the outer periphery of the rotating cylinder 3 made of FRP, the accuracy of this outer periphery is not required to be very high. It is also advantageous to provide a tapered roller bearing or a thrust bearing which rotatably supports the end of the rotating cylinder 3. The industrial waste as a mixture put into the rotating cylinder 3 made of FRP tries to move downward and in the rotational direction inside the rotating cylinder 3 due to the interaction between frictional force and gravity. A moving magnetic field generating device 7 that operates in a direction opposite to the rotating direction of the cylinder 3 is provided adjacent to the rotating cylinder 3, and a separation partition wall 8 is attached to the lower flap-shaped enlarged portion 3b of the rotating cylinder 3 from the fixed side. Therefore, non-magnetic metals and non-metals are separated on both sides of the partition wall 8.

Note that one of the rollers 6 is provided with a drive device 9.

[Brief explanation of drawings]

Figure 1 is a strength comparison diagram of mild steel and FRP, Figure 2 is a longitudinal cross-sectional view of an embodiment of the present invention, and Figure 3 is a comparison diagram of the strength of mild steel and FRP.
A sectional view taken along line A-A in the figure is shown. In the figure, 3 is an FRP rotating cylinder, 3a is a flange part,
4 is a metal ring, 5 is a screw, 6 is a roller, and 7 is a moving magnetic field generator.

Claims (1)

[Scope of utility model registration request] A rotating cylinder made of FRP having an inclined rotational axis is rotated in one direction, and the action of a magnetic field that moves in the opposite direction to the rotating direction is generated by a moving magnetic field generator that is provided adjacent to the lower outer periphery of the rotating cylinder. A flange portion is integrally formed on at least the upper edge of the rotating cylinder, a metal ring is screwed to the flange portion, and a rotating cylinder is attached to the outer peripheral surface of the metal ring. A sorting device for non-magnetic metals, characterized in that a plurality of rollers are provided that are capable of contacting each other and support the rotating cylinder, and at least one of the rollers serves as a driving roller for the rotating cylinder.