JPS6314912Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a polishing device for grains that have a high oil and fat content and water content, such as rice grains and pigeon oats. The present invention relates to a grain polishing device that has been improved to prevent clogging of the polishing tube.

Generally, rice bran is attached to the surface of milled grains, and also to the several shallow grooves on the surface. Therefore, this is polished using a polishing machine to remove the bran and improve quality such as whiteness and taste. However, when the polishing machine is operated, bran adheres to the polishing pressure piece due to frictional heat and the effects of oil, fat, moisture, etc., and if polishing is continued in this state, the adhering bran becomes bran balls, which cause further polishing. If this is continued, the rice bran may stick together in layers and the polishing effect may be significantly reduced. Conventionally, the rice bran that had become stuck had to be cleaned by stopping the operation, which was inefficient.

Therefore, the applicant filed Japanese Patent Application No. 54-159514 (Japanese Unexamined Patent Publication No. 56
Although we developed a rice polishing method using the apparatus disclosed in No. 84643), it was found that even with this method, the rice grains formed into rice balls and clogged the polishing tube. This tendency is especially noticeable when using bran with a high moisture and fat content.

The present invention was developed in view of the above circumstances, and aims to provide a polishing device that has a simple structure, prevents clogging of the polishing tube, and can easily drain rice bran out of the device.

The present invention will be described below based on embodiments shown in the drawings. Reference numeral 1 denotes an outer cylinder, inside of which is provided a polishing cylinder 2 made of a stationary porous cylinder, inside of which is a polishing rotor 4 that rotates integrally with a rotating shaft 3.
is installed. The rotor 4 consists of a rotary cylinder 5 having a through hole 5a, and a plurality of pressing pieces 6, 6, . The pressing piece 6 is constructed by providing a soft elastic base layer 6a such as synthetic resin foam on the side of the rotary cylinder 5, and disposing a skin layer 6b on the surface thereof. 7
is an intake pipe which communicates between the outer cylinder 1 and the polishing body 2. Reference numeral 8 denotes a discharge pipe communicating between the polishing cylinder 2 and the rotary cylinder 5. The polishing tube 2 described above is formed of a corrugated plate having ridge lines parallel to the axis, and holes 2a, 2 smaller than a grain of rice are formed on the ridge lines of the peaks and valleys of the corrugated plate.
b continuously. The corrugated shape of the corrugated plate is relatively rough, with one to several waves corresponding to the length of the pressing piece 5, and the height of the waves is approximately the same as that of the corrugated plate while the pressing piece 5 rotates. The setting is set to a degree sufficient to allow close contact and to cause the pressing piece 5 to move in waves. Therefore, the optimum conditions such as the number and height of the waves are relatively determined by the condition of the rice bran, the rotational speed of the rotary cylinder 5, and the physical conditions of the pressing piece described later. Further, the ridge line portion of the corrugated plate has a rounded shape so that the pressing piece will not be damaged by sliding contact during rotation of the rotary cylinder 5.

Further, the pressing piece 6 is composed of the elastic layer 6a and the skin layer 6b as described above, and the thickness of this pressing piece is determined by the thickness between the surface of the skin layer 6b and the inner diameter of the corrugated trough of the polishing tube 2. is less than the thickness of rice or cortical layer 6
b is such that it is lightly pressed against the inner wall of the polishing cylinder 2. The above-mentioned distance or clamping force is determined as appropriate depending on the amount of grains to be polished and the degree of polishing. The material for the cortical layer is preferably one that is elastic and wear-resistant, such as leather or synthetic rubber.

Next, with respect to the present invention constructed as described above, polishing and how to prevent clogging of rice bran will be explained. The rotating shaft 3 is rotated by a suitable driving means, and the rotor 4 is rotated. Refined grains are supplied from one end of the outer cylinder 1, and polished by the polishing cylinder 2 and the rotary cylinder 5.
Insert between. As the rotor 4 rotates, each pressing piece 6 is separated from the rotary cylinder 5 by the centrifugal force, and is pressed against the polishing cylinder 2. As a result, the input fine grains are rubbed between the pressing piece 6 and the polishing cylinder 2, and the rice bran adhering to the fine grains is separated. At this time, if air is taken in through the intake pipe 7 in advance, the intake air flow will be generated from the rotary cylinder 5 through the through hole 5a to the intake pipe 7, and the separated rice bran powder will be discharged out of the machine along with the intake air flow. Ru. The polished product that has been polished is discharged from the discharge pipe 8.

The polishing process progresses in this way, but if this operation continues for a long time, as mentioned above, bran will stick to the abraded areas (mainly on the surface of the pressing piece). During operation, the shape of the piece 6 is deformed as shown by the solid line in the same figure due to the pressing (elastic pressure) and the elastic sliding of the pressing piece 6 on the corrugated polishing cylinder, and the bran is pushed out from the hole 2a at the peak of the corrugation. The bran tends to accumulate in the space 2c directly under the crest of the waveform, and the pressure that presses the pressure piece 6 at the trough (near 2b) of the waveform causes pressure that pushes the bran out into the space 2c of the pressure piece 6. It is thought that this is to cause this phenomenon to occur.

As described above, the present invention uses a corrugated polishing tube with many holes in its peaks and troughs, an elastic pressure piece is brought into sliding contact with the polishing tube, and the rice is rubbed between the polishing tube and the pressure piece to polish the rice. This structure allows the rice bran to be effectively discharged from the polishing cylinder while polishing.
Since the polishing tube does not get clogged, continuous operation for long periods of time is possible. This is particularly effective when the rice bran contains a large amount of water or oil.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the apparatus according to the present invention, and FIG. 2 is a partially enlarged view showing the state in which the pressing piece in FIG. 1 is in sliding contact with the polishing cylinder. 2... Polishing tube, 2a, 2b... Hole, 5... Rotating tube, 6... Pressing piece, 6a... Elastic body base layer, 6b...
...cortical layer.

Claims (1)

[Claims for Utility Model Registration] A stationary polishing tube 2 and a plurality of pressing pieces 6 that slide and rotate on the inner wall of the polishing tube 2 are provided, and grains are placed between the inner wall of the polishing tube 2 and the pressing pieces 6. A grain polishing device for polishing grains by rubbing, characterized by satisfying the following conditions A, B, and C. (A) The polishing tube 2 is formed of a corrugated plate having ridges parallel to the axis, and has continuous holes 2a and 2b smaller than grains on the ridges of the peaks and valleys of the corrugated plate, respectively. (B) The pressing piece 6 is a soft elastic base layer 6 such as foam.
A skin layer 6b is disposed on the surface of the polishing tube 2 and is in sliding contact with the inner wall of the polishing tube 2, and one side thereof is fixed on the outer periphery of the rotary tube 5. (C) The thickness of the pressing piece 6 is such that the gap formed between the surface of the cortex 6b and the inner diameter of the corrugated trough of the polishing tube 2 is less than the thickness of the grain, or the cortex 6b is slightly attached to the inner wall of the polishing tube 2. To the extent that they are oppressed.