JPS62250951A - Rubber roll for rice hulling - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is an improvement regarding a hulling device that separates rice husks from rice between a pair of left and right rubber rolls.

(Prior technology) Conventionally, the paddy was supplied to the center of a rotating disk with radial guide vanes, and the paddy was attached to the outer periphery of the disk using the centrifugal force of the rotating disk. There is a method that peels off the rice husks by colliding with an impact plate, but this method has the drawback of generating a large amount of broken rice.

Furthermore, as shown in FIG. 2, there is a so-called roll-type huller. This is a pair of left and right rubber rolls A with different circumferential speeds.
When paddy is fed by dropping the heavy germ part downward between ,H,
The rubber layer is pressed by the rice grains and produces a strain m.

The moment the paddy leaves the gap between rubber rolls A and B,
Due to the difference in circumferential speed between the two rolls and the elasticity of the strain m returning to its original state, the high-speed roll A side is peeled upward while the low-speed roll B side is peeled, as if peeling the thin skin of a Nanjing bean in opposite directions with the fingertips of the thumb and index finger. A downward force is generated (see Figure 3 A), and the left and right rice husks, consisting of the internal and external husks, are separated.

The grains that pop out from between the two rolls are on the impact-reducing plate C.
The rice husks are ejected from the aircraft by colliding with them, weakening their force, and falling into the wind sorting device connected below.

By the way, brown rice is covered with a seed coat and has a starch layer inside with a thin aleurone layer.

However, if the area and time in which the paddy is in contact with the rubber rolls A and B during hulling are long, the dehulling rate will be improved, but if the seed coat of brown rice is damaged, the internal starch layer will appear, resulting in so-called grained rice.

The diameter of conventional rubber rolls is 153 mm for small diameter rolls, and 222 mm for large diameter rolls. Large diameter rolls have a higher demolition rate than small diameter rolls, and the incidence of grainy rice is 60-80%. The more you roll, the more expensive it is.

In general, it is difficult to see grained rice, so there is a tendency to ignore the graining rate and adopt large-diameter rolls that improve the grain removal rate.

However, grainy rice is susceptible to deterioration during storage, which significantly impairs its taste.

(Problems to be Solved by the Invention) The present invention is based on the above-mentioned problem that if the area and time in which the paddy is in contact with the left and right pair of rubber rolls is long, the dehulling rate improves, but the incidence of grainy rice is high. Based on this knowledge, the aim is to improve the rate of dehulling and lower the incidence of grainy rice.

(Means for solving the problem) As shown in Fig. 1, the diameters of the left and right pair of rubber rolls 1 and 2 are significantly shorter than those of conventional products.
Millimeter - 70mm.

And 6,000 times per minute, which is significantly faster than conventional products.
Rotate it 20,000 times to make the circumferential speed 900-2.500 cubic meters/1n.

(Function) The rubber roll 1.2 of the present invention has a diameter of 40 to 70 mm, which is significantly shorter than the conventional rubber rolls A and H, which have a diameter of 153 mm to 222 mm, as shown by dotted lines in FIG. Since the valleys of the adjacent upward V-shape or downward V-shape are extremely wide, the area in which the paddy contacts both rolls is narrow.
Moreover, it rotates between 6,000 and 20,000 per minute, and the time in which it is in contact with both rubber rolls 1 and 2 is extremely short. A rift is created between the Ei and the external Ei.

The cracked rice then flies out from between the two rolls having a high circumferential speed and collides with the shock absorbing plate C between the two rolls, thereby peeling off the rice husks.

(Example) With conventional relatively small rubber rolls with a diameter of 153 mm, the rotation speed of the high speed roll is usually 1.20 rpm, and the rotation speed of the low speed roll is reduced by 23% to remove rice.

By the way, when comparing the rubber roll of the present invention with a diameter of 50 mm and a small rubber roll with a diameter of 153 mm, which has a lower surface rubbing rate than the conventional large rubber roll with a diameter of 222 mm, at a faster circumferential speed, the results are as follows. It is.

The rotational speed of both the present invention and the conventional product was reduced by 30% of that of the high-speed roll, and in both cases, the rubber hardness was 85 @ and the roll gap was 0.5 mm.

In this way, the extremely small diameter rubber roll (diameter 50
mm) compared to conventional small rubber rolls (diameter 153 mm), as the circumferential speed increases, the debonding rate improves and the surface rubbing rate is low.

Moreover, conventional large rubber rolls (diameter 22
2 mm), the surface rubbing rate is further improved when the peripheral speed is the same as that of the rubber roll according to the present invention.

(Effects of the Invention) In short, the rubber roll of the present invention has a diameter that is significantly shorter than that of conventional rubber rolls, 40 mm to 70 mm, so that the valleys of the upward V-shape and downward V-shape of the hulling gap are significantly wide. The contact area of the rice grains with the left and right rubber rolls is small due to point contact, causing cracks in the rice husks, and the rotation speed is increased from 6,000 to 20,000 revolutions per minute to increase the circumferential speed of the rice husks. The paddy with cracks is ejected forcefully and collides with the shock absorbing plate C, so the paddy with no cracks in the husk is hit! Compared to the conventional impact-type dehulling machine that collides with I11 Japanese boards, the rice husks can be dehulled without applying a strong impact, and the rice husks are divided into an inner hole and an outer hole without causing broken rice, producing brown rice without any peeling. Can be taken out efficiently. This effect is produced.

[Brief explanation of drawings]

Fig. 1 is a front view of the rubber rolls of the present invention and a conventional product, Fig. 2 is a front view showing the state of hulling with the conventional product, and Fig. 3 is a conventional product showing the direction of external force applied to the paddy from the left and right rubber rolls. The product and the action diagram of the present invention. A and B are conventional rubber rolls, and M is the thickness of the paddy. m is the strain experienced by the rubber layer, L is the gap between the left and right rubber rolls, C is the shock absorbing plate, l and 2 are the rubber rolls of the invention. Agent Maki Tobe (and 2 others) Figure 3 I-B Figure 1-28 1 Itouri Ne City Masho (Volunteer) May 26, 1986

Claims (1)

[Claims] The diameter of the left and right pair of rubber rolls is set to 40 mm to 70 mm.
A rubber roll for hulling rice, which is characterized by increasing its circumferential speed by rotating 6,000 to 20,000 times per minute.