Rotary shaking separator

Details Rotary shaking separator Rotary shaking separator

2000-12-05

2002-10-08

Nguyen, Tuan N. (Department: 3653)

Classifying, separating, and assorting solids

Stratifiers

Movable bed

C209S365400, C209S505000, C209S691000

Reexamination Certificate

active

06460704

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a separator for separating unhulled rice and unpolished rice from each other after hulling rice, and in particular, to such type of separator that rotationally shakes a circular separating vessel for the separation.
DESCRIPTION OF THE PRIOR ART
The inventor of the present invention has suggested in the Japanese Patent Application No. H11-106959 a rotary shaking separator which can reduce a space for installing the separator while maintaining separating accuracy of each of a plurality of circular separating vessels at a certain level even if they are arranged in multi-rows. To describe the configuration of this separator with reference to
FIG. 13
, the separator is designed to have a geometry in which a vertical supporting point “O” of an eccentric revolving motion is arranged above a shaft center of a rotary shaft
13
and an inclination line “P” is extended downwardly from said vertical supporting point “O” with a predetermined inclination angle, and a separating vessel
4
A is rotatably mounted to an eccentric portion
22
A,
23
A formed on said inclination line “P”.
FIG. 14
is a schematic view illustrating said separating vessel
4
A being revolved by the rotary shaft
13
, and
FIG. 15
is a schematic top view of the separating vessel
4
A. Referring to
FIGS. 14 and 15
, the separating vessel
4
A is supported by an eccentric portion “H” of the rotary shaft
13
inserted through a central portion “S” of the separating vessel
4
A to allow the rotary shaft
13
to rotate with respect thereto, while a peripheral edge portion of the separating vessel
4
A is supported by a plurality of springs “B” to prevent free rotation thereof (the separating vessel
4
A is held and restrained at the central portion thereof by the rotary shaft
13
and at the peripheral edge portion thereof by the plurality of springs “B” respectively so that the motion of the separating vessel
4
A is limited to a certain range). As the rotary shaft
13
rotates, the separating vessel
4
A is revolved around the rotation center “O” of the rotary shaft
13
by an eccentricity amount “r” (as shown by dotted lines
4
A
1
,
4
A
2
and
4
A
3
in FIG.
15
), and thereby unhulled rice and unpolished rice in the rice mixture are separated from each other on the separating vessel
4
A so that the unhulled rice is discharged through a unhulled rice discharging port disposed in the vicinity of the central portion “S” and the unpolished rice is discharged through an unpolished rice discharging port disposed in the vicinity of the peripheral edge portion.
As for said separating vessel
4
A, the rotary shaft
13
is designed to rotate under the condition that a center of gravity “G” of the separating vessel
4
A is on the central portion “S” of the separating vessel
4
A, but if supply of material to be separated is increased, the center of gravity is offset from the central portion “S” by the eccentricity amount “&egr;”, which may result in a failure in separation (G
1
in FIG.
14
). Furthermore, when stiffness of the springs “B” for preventing the free rotation of the separating vessel
4
A gets weaker through a long-term service, a travelling distance of said materials placed on the separating plates of the separating vessel
4
A to be separated thereby is possibly varied even along the same radii symmetrical to each other around the central portion “S”, resulting in a failure in separation at some locations in the same separating vessel
4
A.
Yet further, because the rotary shaft
13
is inserted through the central portion “S” of the separating vessel
4
A, the unhulled rice discharging port is necessarily designed to be narrow, which has exhibited some disadvantages that mounting of components is difficult, maintenance thereof is troublesome, and discharge of unhulled rice is not facilitated.
SUMMARY OF THE INVENTION
In the light of the problems described above, an object of the present invention is to provide a rotary shaking separator which prevents a failure in separation in the same separating vessel, allowing a constant separating accuracy to be maintained, without requiring a rotary shaft to be inserted through a central portion of the separating vessel.
To solve the problems described above, the present invention provides in the view of technology a rotary shaking separator comprising a separating vessel having a plurality of segmental separating plates arranged in a cone-shape form and a drive means for rotationally shaking said separating vessel so that once material to be separated, which is mixture composed of unhulled rice and unpolished rice, is supplied into a predetermined location of said separating vessel, said unhulled lice is discharged from a peripheral edge portion of said separating vessel and said unpolished rice is discharged from a central bottom portion of said separating vessel, wherein said separating vessel is supported by a plurality of drive means arranged in peripheral edge portions thereof on the same radii from the center of said separating vessel with arc lengths thereof being equal to one another, and said peripheral edge portions of said separating vessel are sequentially driven elliptically by said plurality of drive means to rotationally shake the whole of said separating vessel. Owing to this arrangement, since the mixture of unhulled rice and unpolished rice supplied into the separating vessel has greater acceleration in the vicinity of the peripheral portions, the unpolished rice having smaller grain size and greater specific gravity is carried toward the peripheral edge direction to be discharged from an unpolished rice discharging port, while the unhulled rice having greater grain size and smaller specific gravity slides down along the cone-shaped separating plates to be discharged from a central bottom portion of the separating vessel, thereby making it possible to retain a constant degree of separating accuracy without any failure in separation which might otherwise occur on the same separating plate and further to provide a rotary shaking separator which requires no rotary shaft inserted through the central portion of the separating vessel.
Further, it is preferable that the rotary shaking separator has a plurality of electric motors each being provided corresponding to each of a plurality of drive means. In this case, it is preferable that, in order to operate the plurality of electric motors synchronously, the apparatus comprises a measuring device for measuring a number of revolutions of a drive shaft of each of the electric motors and a controller for controlling every electric motor to be driven in a specific number of revolution based on the outputs from the measuring device as well as for actuating every electric motor synchronously with a specific phase delay therebetween, so that the drive means may be protected from being damaged by a possible over loading which might occur when the number of revolutions of each electric motor is varied or the phase thereof is shifted improperly.
Further, since a single electric motor may be used to actuate said plurality of drive means to eliminate any kinds of devices to operate a plurality of electric motors synchronously, the number of controllers and electric motors required for synchronous operation could be reduced, and thus a manufacturing cost could also be reduced.
When a plurality of electric motors are provided for a plurality of drive means so as to correspond one by one with each other, such type of drive means may be employed that comprises: an input shaft rotatably arranged vertically so as to transmit the revolution from an electric motor; a swash plate cam axially attached to said input shaft; and an output shaft which follows displacement caused by the revolution of said swash plate cam to make an elliptical locus. Further, another type of drive means may also be employed which comprises: an input shaft rotatably arranged vertically so as to transmit the revolution from an electric motor; a cam member having a swash plate cam attached thereto

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