JPH0647289A - Rice polishing machine - Google Patents

Abstract

PURPOSE:To provide the rice polishing machine which can sufficiently remove the rice bran and peeling bran, etc., sticking to rice grains even if the rice grains are continuously treated. CONSTITUTION:This rice polishing machine has a drum 1, spiral fins 2, a compressed air supply pipe 3, nozzles 4 for ejecting compressed air, a device 5 for carrying in the rice grains and metallic balls and a device 6 for separating the metallic balls. The drum 1 has right and left end plates 7, 8 having supply ports and discharge ports for the rice grains and the metallic balls, reinforcing stays 9, mesh plates 9 fixed along the end plates 7, 8 and revolving shaft parts 10, 11 fixed to the end plates 7, 8. A pulley 16 for rotationally driving the drum 1 is fixed to the shaft part 11. The spiral fins 2 transfer the rice grains and metallic balls in the drum 1 to the discharge port side while agitating these grains and balls. The supply pipe 3 is connected to a hose 16 for supplying the compressed air on one end side and is provided with the nozzles 4 for ejecting the compressed air to the rice grains under transfer. A separating device 6 has four belt conveyors 60 to 65, attracts and removes the metallic balls by magnets and discharges the polished rice grains from a chute 64.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice polishing apparatus, and more particularly to a dry rice polishing apparatus capable of continuously removing rice bran and the like by polishing rice grains without using water.

[0002]

2. Description of the Related Art As is well known, rice grains used for cooked rice are
It is sharpened with water and then cooked with an electric rice cooker. However, the work of polishing rice with such water is very cumbersome and inefficient, and improvement has been desired for commercial use such as cooking a large amount of cooked rice. Further, when rice grains are ground with water, rice bran is mixed into the drainage, causing water pollution. Therefore, improvement has been desired from the viewpoint of preventing environmental pollution. Therefore, for example, Japanese Patent Application Laid-Open No. 1-218642 proposes a dry-type rice polishing machine that does not use water. The rice polishing machine disclosed in this publication stirs the rice grains stored in a container with a stirrer provided with a brush, and friction between the rice grains and between the rice grains and the brush causes rice bran and rice bran attached to the rice grains. A structure is adopted in which peeled sugar and the like are separated and the separated attached substances such as rice bran are discharged to the outside by an air flow.

However, since the rice polishing machine disclosed in the above publication is provided with an on-off valve and the like and employs so-called batch processing, for example, when it is used for the above-mentioned business, intermittent polishing is performed. I was dissatisfied with the efficiency of rice polishing because it became rice. For such problems, for example, the actual Kaihei 3-
Japanese Patent No. 75838 proposes a dry-type rice polishing machine capable of continuously polishing rice grains. However, the grain polishing machine disclosed in this publication has a grain polishing brush that is driven to rotate in the rice flow path and is provided with dust collecting means downstream of the grain polishing brush. Had the technical problems described below.

[0004]

That is, in the rice polishing machine described in the above publication, dust collecting means is provided on the downstream side of the rice polishing brush. Therefore, rice bran or the like which has once been separated from the rice grains by the rice polishing brush, etc. However, there is a problem that it becomes difficult to remove the redeeded rice bran and the like by the dust suction means.

The present invention has been made in view of such conventional problems, and its object is to sufficiently treat rice bran and peeling sugar adhering to rice grains continuously. The purpose is to provide a polishing machine that can be removed.

[0006]

In order to achieve the above object, the present invention has a case which is housed in a case, has a supply port and a discharge port at its end, and has a grain size larger than that of rice grains to be milled. A large number of small-diameter hole portions are provided, and a perforated cylindrical drum that is driven to rotate, and rice grains and metal balls that are provided on the inner peripheral surface of the drum and that are supplied to the drum from the supply port side. A spiral fin that moves to the discharge port while stirring, a compressed air supply pipe provided along the axial direction of the drum, and an axial direction of the compressed air supply pipe that is transferred by the spiral fin. A plurality of nozzles for ejecting compressed air to the rice grains on the way, and a separating device for separating and extracting the metal balls from the rice grains and the metal balls discharged from the outlet are characterized.

[0007]

According to the rice polishing apparatus having the above structure, a spiral fin for transferring rice grains from the supply port side to the discharge port side while stirring,
Since it has a plurality of nozzles for ejecting compressed air to the rice grain being transferred by the spiral fin, the rice grain and the drum, the spiral fin, the metal balls and the rice grain are rotated by rotating the drum and stirring the spiral fin. Friction occurs between the rice grains, and the frictional force causes rice bran and the like adhering to the rice grains to separate. The separated rice bran or the like is discharged to the case side through the hole of the drum by the compressed air ejected from the nozzle, and reattachment is prevented.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. 1 and 2 show an embodiment of a rice polishing machine according to the present invention. The rice polishing machine shown in the figure has a drum 1, a spiral fin 2, a compressed air supply pipe 3, a nozzle 4 for injecting compressed air, a rice grain and metal ball carry-in device 5, and discharged rice grains and metal. A separating device 6 for separating the metal sphere from the sphere.

The drum 1 has a pair of left and right end plates 7 and 8 arranged opposite to each other, a plurality of reinforcing stays 9 having both ends fixed between the end plates 7 and 8, and end plates 7 and 8. A mesh plate 9 fixed along the outer periphery of the
And left and right rotation shaft portions 10 and 11 which are fixed to the centers of the left and right end plates 7 and 8 and are coaxially located. Further, the drum 1 is housed in a case 12 that covers the outer periphery thereof, and a cover 13 fixed to the case 12 is arranged outside the left end plate 7, and the cover 13 has rice grains A cylindrical discharge guide 14 that guides the metal ball to the outside is attached. The case 12 has an inclined surface formed below it, and a collecting section 12a such as rice bran is provided at the lowest portion of the inclined surface. The collecting section 12a includes a suction pipe 15 connected to a dust suction device (not shown). An opening is provided.

The compressed air supply pipe 3 is formed of a hollow pipe, extends through the left rotary shaft portion 10 to the right rotary shaft portion 11, and has one end supported by the right rotary shaft portion 11 via a bearing. There is. The compressed air supply pipe 3 is connected to the drum 1
A hose 16 that is arranged substantially at the center and supplies compressed air to one end side is connected, and a jet nozzle 4 that is directed downward is provided along the axial direction thereof. In this embodiment, the injection nozzle 4 is not provided in a predetermined length portion on the right end side of the drum 1, and is a portion approximately ⅔ of the length where the supply pipe 3 is located in the drum 1. Are installed at equal intervals.

A pulley 17 is provided at the right end of the right rotating shaft portion 11.
Is fixedly mounted, and the timing belt 18 wound around the pulley 17 is run by a motor (not shown), so that the drum 1 moves in a predetermined direction around the rotary shafts 10 and 11 at, for example, 20 to 30 minutes per minute. It is rotationally driven at a rotational speed of 30 times. The rice grain carrying-in device 5 is a hopper 1 into which rice grains are loaded.
9 and the spiral blade 20 fixed to the outer periphery of the right rotation shaft portion 11
And a widening cylinder portion 21 that connects the hopper 19 and the right end plate 8 of the drum 1 for communication.

In this embodiment, the separating device 6 is mainly composed of four belt conveyors, and a first belt conveyor 60 is installed below the discharge guide 14. The first belt conveyor 60 includes a pair of rollers 60a and 60b.
And a belt 60c wound between rollers 60a and 60b, the belt 60c being below the discharge guide 14 for receiving the polished rice grains and the metal balls discharged from the guide 14. . The belt 6 of the first belt conveyor 60
One roller 60a located on the front side in the traveling direction of 0c (indicated by an arrow in FIG. 1) is formed of a magnet capable of attracting a metal ball.

The second belt conveyor 61 is installed facing the same level position as the first belt conveyor 60. The second belt conveyor 61 includes a pair of rollers 6
1a, b, and a belt 61c wound between the rollers 61a, 61b, located inside the wound lower belt 61c and at a position overlapping the belt of a third belt conveyor 62 described later. Is provided with a magnet block 61d that attracts a metal ball.

The third belt conveyor 62 is installed below the first and second belt conveyors 60 and 61 and has a pair of rollers 62a and 62b and a belt 62c wound between the rollers 62a and 62b. One roller 62a located on the front side in the traveling direction of the belt 62c (indicated by an arrow in FIG. 1) is formed of a magnet capable of attracting a metal ball. The other roller 62b is set at a position where the center of rotation of the roller 62b contacts the outer periphery of the roller 60a of the first belt conveyor 60.
A chute plate 63 bent in a substantially V shape is installed between 2b.

A cylindrical chute 64 for discharging the separated rice grains is provided on the left side of the roller 62a of the third belt conveyor 62, and a lower right end of the cylindrical chute 64 is below the roller 62a. Is provided with a chute portion 64a extending at a predetermined inclination angle. The fourth belt conveyor 65 is installed below the third belt conveyor 62, and has a pair of rollers 65a and 65b and rollers 65a and 65b.
And a belt 65c wound between them, one roller 65a is located coaxially below the roller 62a of the third belt conveyor 62, and the other roller 65b is provided below the carry-in device 5. There is.

The belt 65 of the fourth belt conveyor 65
The metal balls falling from the chute plate 63 and the metal balls falling from the chute portion 64a of the cylindrical chute 64 are received on the c. The member indicated by reference numeral 30 in FIG. 1 is a horizontal beam that horizontally supports the drum 1 installed in the case 12. 3 and 4 show details of the left and right end plates 7 and 8 used in this embodiment. The left end plate 7 is formed of a flat plate having a substantially octagonal outer peripheral shape, and a through hole 7a is formed in the center of the left end plate 7 in which the left rotary shaft portion 10 is fixed in an inserted state.
Outside the through hole 7a, a plurality of substantially U-shaped cutouts 7b which serve as a discharge port of the polished rice grains are provided, and the reinforcing stay 9 is fixed around the through hole 7a. A hole 7c is provided.

Like the left end plate 7, the right end plate 8 is formed of a flat plate having an outer periphery of a substantially octagonal shape, and has a through hole 8a formed in the center thereof for fixing the right rotating shaft portion 11 in the inserted state. A plurality of substantially trapezoidal through holes 8b serving as rice grain supply ports are provided outside the through hole 8a, and a hole portion 8c for fixing the reinforcing stay 9 is provided around the through hole 8a. ing.

The main part of the drum 1 is
This is an assembly of divided units A obtained by dividing an octagon into four as shown in FIGS. 5 and 6, and each divided unit A has a pair of flange portions 22 arranged at both ends and each flange portion 2
2 and a mounting hole 23 for connection provided in each of the divided units A, a plurality of ribs 24, which become the spiral fins 2 in the assembled state, are welded between the flange portions 22 at predetermined intervals in each divided unit A. At the same time, a part of the mesh plate 9 bent in a substantially concave shape is welded to the outer periphery of the rib 24.

The four divided units A thus constructed are assembled into a cylindrical shape by bringing the flange portions 22 adjacent to each other in the circumferential direction into contact with each other and attaching the bolts and nuts to the respective mounting holes 23 to form a cylindrical shape. As shown in FIG. 1, the ribs 24 provided in each division unit A are continuous in the circumferential direction,
The spiral fin 2 is formed at a predetermined pitch and at a predetermined angle with respect to the axial direction.

When the split unit A is assembled, a substantially octagonal space is formed on the inner peripheral side of the spiral fin 2, and the reinforcing stay 9 is inserted through this space. Then, the left and right end plates 7 and 8 to which the left and right rotary shafts 10 and 11 are fixedly attached are attached to both ends of the cylindrical assembly as described above, and the reinforcing stay 9 is provided between the end plates 7 and 8. When fixed, the drum 1 shown in FIG. 1 is obtained.

Next, the operation of the rice polishing machine having the above structure will be described. To operate the rice polishing machine, rotate the pulley 16
Moreover, in a state where compressed air is supplied to the compressed air supply pipe 3,
Rice grains and metal balls are put into the hopper 18. In this case, as the metal sphere, an iron sphere whose diameter is almost the same as the grain size of rice grain or an alloy metal sphere that can be magnetically adsorbed is used. The rice grains and the metal balls introduced into the hopper 18 are continuously fed into the drum 1 through the through hole 8b of the right end plate 8 by the rotational driving of the spiral blade 19. The rice grains and the metal balls fed into the drum 1 are continuously transferred to the discharge port side of the left end plate 7 while being stirred by the rotation of the spiral fin 2. In the process of this transfer, friction is generated between the rice grains and the mesh plate 9 of the drum 1, between the rice grains and the spiral fin 2, between the rice grains and the metal balls, and between the rice grains in the course of this transfer, This frictional force causes rice bran and the like adhering to the rice grains to separate. The separated rice bran or the like is discharged to the case 12 side through the holes of the mesh plate 9 of the drum 1 by the compressed air ejected from the nozzle 4, collected in the collecting unit 12a, and then collected through the suction pipe 15. The rice bran contained in the dust device and separated from the rice grains is prevented from reattaching.

In this case, when compressed air is ejected from the nozzle 4 to the rice grains, the compressed air promotes cooling of the rice grains,
Since it is possible to prevent deterioration such as cracking of rice grains whose temperature rises due to friction, it is desirable that the temperature of the compressed air is lower than normal temperature. Then, the foreign matter such as rice bran is removed,
The rice grains that have been milled are continuously passed together with the metal balls through the cutout portion 7b of the left end plate 7 of the drum 1 and the discharge guide 13a, and then the belt 6 of the first belt conveyor 60 of the separation device 6.
It is made to fall on 0c. And rice grains and metal balls,
When it is placed on the belt 60c and reaches the vicinity of the roller 60a, the metal balls are adsorbed by the roller 60a formed of a magnet, and only the rice grains are fed to the third belt conveyor 6
3 onto the belt 62c.

When the metal ball attracted to the roller 60a moves away from the roller 60a due to the traveling of the belt 60c, the attractive force of the magnet decreases, and the metal ball separates from the belt 60c and drops onto the chute plate 63. On the other hand, the rice grains received by the third belt conveyor 62 are then transferred to the roller 6
It is transferred to the 2a side. During the transfer, the metal balls that have not been removed by the first belt conveyor 60 are first adsorbed and removed by the magnet block 61d of the second belt conveyor 61.

Further, the metal balls that have not been adsorbed and removed by the block 61d are adsorbed and removed by the rollers 62a of the third belt conveyor 62, and only the finally milled rice grains are discharged from the cylindrical chute 64. Roller 62a
The metal spheres adsorbed on the spheres fall on the chute portion 64a when the belt 62c runs away from the rollers 62a. The metal balls dropped on the chute plate 63 and the chute portion 64a are respectively received by the belt 65c of the fourth belt conveyor 65, transferred to the right end side of the conveyor 65, and from this part, for example, by a bucket type conveyor. It is thrown into the hopper 19 and recycled.

When the metal balls are circulated, for example, a washing / drying device may be installed at the right end of the fourth belt conveyor 65 to remove rice bran and the like adhering to the metal balls before supplying the hopper 19. it can. Further, in order to surely remove the metal balls attracted to the rollers 60a and 62a of the separating device 6, for example, a scraper may be provided below and below each of the rollers 60a and 62a. Further, in the above-mentioned embodiment, the one in which the carry-in device 5 is provided on the right side of the drum 1 is illustrated, but this is not always necessary in the practice of the present invention. You may make it supply with a metal sphere.

[0026]

As described above in detail in the embodiments,
According to the polishing machine of the present invention, rice bran, peeled sugar, etc., which have been separated due to friction between rice grains, metal balls and rice grains,
It is released to the outside by compressed air and its redeposition is prevented, so that it is possible to efficiently and continuously grind rice. Moreover, since the rice grains are cooled by the compressed air, it is possible to prevent the rice grains from being denatured from being deteriorated.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part showing an embodiment of a rice polishing machine according to the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is an explanatory diagram of a left end plate of the drum shown in FIG.

4 is an explanatory view of a right end plate of the drum shown in FIG.

5 is a perspective view of a split unit used in the drum of the rice polishing machine shown in FIG. 1. FIG.

FIG. 6 is a plan view of the split unit.

FIG. 7 is a side view of the split unit in an assembled state.

[Explanation of symbols]

 1 Drum 2 Spiral fin 3 Compressed air supply pipe 4 Injection nozzle 6 Separation device

Claims (1)

[Claims] 1. A porous body which is housed in a case, has a supply port and a discharge port at an end thereof, is provided with a large number of holes having a diameter smaller than that of rice grains to be ground, and is driven to rotate. A cylindrical drum, a spiral fin provided on the inner peripheral surface of the drum for transferring rice grains and metal balls supplied into the drum from the supply port side to the discharge port side while stirring, and A compressed air supply pipe provided along the axial direction, a plurality of nozzles provided along the axial direction of the compressed air supply pipe, for ejecting compressed air to the rice grains being transferred by the spiral fin, A rice polishing machine, comprising: the rice grains discharged from the discharge port and a separation device for separating and extracting metal balls from the metal balls.