JPH07102332B2 - Vertical type rice milling machine - Google Patents

Description

The present invention relates to a rice milling machine, and more particularly to a vertical axis rice milling machine.

[Conventional technology]

For example, Japanese Patent Publication No. 54-3098 (see FIG. 5) is known as a vertical type rice milling machine. This is a screw type conveyor 102 mounted on the lower half of a hollow shaft 101 that is rotatably erected.
Are fixed to the upper half of the rotor 103, respectively, and the passage 105 is made to face the lower end of the screw type conveyor 102 by the rotor 103.
A screen 104 is provided around the rotor, and an extraction device 106 is provided above the rotor 103. The wind generated by the blower provided behind the bran outlet 107 installed below the screen 104 is generated by the shaft 101. Is formed so as to be supplied to the lower end of the. As a result, the wind supplied into the shaft 101 blows out from the hole 101a formed in the upper half of the shaft 101, cools the grain to be refined, and promotes the discharge of fine powder (bran). is there.

[Problems to be solved by the invention]

By the way, in the case of the horizontal axis rice mill, the rice grains are biased to the lower part of the whitening chamber (the gap formed between the rotor and the screen) by gravity, whereas in the case of the vertical axis rice milling machine, the rice grains are almost evenly distributed in the whitening chamber. The rice grains are distributed and undergo a whitening action, but due to the air blow from the shaft, rice grains are pushed around the whitening chamber, that is, the screen wall and stick to the edges, giving a moderate roughness.
There is a tendency that the dense state does not appear, so that the stirring / flowing action is not smoothly performed (unevenness is caused), and the bran does not proceed. This becomes particularly noticeable when a bran-removing fan for sucking and removing bran in the whitening chamber is additionally provided.

In view of the above, the present invention has a technical object to provide a vertical-axis rice milling machine that activates the stirring / flowing and debriding action of rice grains in a whitening chamber and that does not cause uneven smashing.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention axially mounts a feed roller communicating with a supply port and a milling roller communicating with a discharge port on a hollow shaft rotatably erected with a large number of ventilation holes. The milling roller is hollow and is provided with a ridge and a ventilation groove on the peripheral surface, and a bran wire mesh surrounding the milling roller is erected to form a polishing room,
Further, in the vertical axis type rice milling machine in which the bran removal chamber is formed by surrounding the bran removal mesh, a. One end of the hollow shaft is closed and the open end is connected to a suction fan via an air intake duct.

B. An air supply port and an air exhaust port are opened in the bran removal chamber.

C. The air outlet is connected to the bran removal fan via the bran removal duct.

I took the technical means.

[Work]

As a result, the rice grains flowing in from the supply port are transferred to the polishing chamber by the feed roller, and the pressure is moderately high due to the stirring action of the milling roller's pulsation, as well as the grain friction and the friction between the grains and the bran mesh surface. The bran layer is peeled by the bran layer.At this time, the bran powder in the whitening chamber is removed to the bran chamber by the wind that crosses the milling chamber from the air inlet to the exhaust port, and then passes through the bran duct to leave the machine. A part of the wind that has been discharged into the milling chamber and flows into the hollow part of the milling roller from the ventilation groove of the milling roller along with part of the bran powder generated in the ribs, and the hollow shaft. Since it flows into the ventilation holes of the machine and is exhausted to the outside of the machine through the suction duct, this suction force prevents the rice grains in the whitening chamber from being pushed toward the bran removal side and sticking to the side.
Smooth agitation / fluid action is provided by the pulsation of the milling roller.

Example of Invention

Preferred embodiments of the present invention will be described below with reference to the drawings. 1 is a longitudinal sectional view of an embodiment of the present invention, FIG. 2 is a cross-sectional plan view of the same, FIG. 3 is a partially enlarged view of FIG. 2, and FIG. 4 is a partially enlarged view of FIG. .

Reference numeral 1 denotes the entire vertical shaft type rice milling machine, in which an upper bearing 3 and a lower bearing 4 are fixedly attached to a frame 2, whereby a hollow shaft 5 is rotatably erected. A plug 6 is inserted at the lower end of the hollow shaft 5 to close the hollow shaft 5, and a feed roller 7 having a spiral blade formed on the surface is axially attached near the lower half portion, and is connected to the upper end of the feed roller to form a hollow shape. The milling roller 8 is mounted on the shaft. On the peripheral surface of the milling roller 8, there is a ridge 9.
A plurality of, for example, three, and the same number of ventilation grooves 10
Is provided along the ridge 9, and the ventilation groove 10 is provided with a wire mesh 10a for preventing rice grains from entering (FIG. 4).
Further, a large number of ventilation holes 11 are provided on the peripheral surface of the hollow shaft 5 located in the hollow portion of the milling roller 8, and the open end of the upper end of the hollow shaft 5 is connected to the suction fan 23 via an air intake duct 22. .

The feed roller 7 is installed inside a cylindrical funnel base 12 with a slight gap, and a supply port 13 is opened at the lower end of the funnel base 12. A bran wire mesh (screen) 14 surrounding the milling roller 8 and formed of a porous wall is erected in a polygonal cylindrical shape that is a multiple of the ridge 9 of the milling roller.
As a result, a whitening chamber 29 is formed between the milling roller 8 and the bran removal wire net 14. That is, since the ridge 9 has three lines, the shape of the bran-removing wire net 14 can be selected to be a hexagonal, 9-sided or 12-sided shape which is a multiple thereof, and in this embodiment, it is a 12-sided tubular shape.

A cylindrical wall (15) is erected so as to surround the debranching wire net (14), and a space between the cylindrical wall (15) and the debranching wire net (14) forms a debranching chamber (16). An air supply port (17) is opened at an arbitrary part of the cylinder wall (15), and a cover (41) is attached so that bran does not spill from the air supply port (17). An air exhaust port 18 is opened in the cylindrical wall 15 on the side substantially opposite to the air supply port 17, and the air exhaust port 18 is connected to a bran removing fan 19 provided outside the machine via a bran removing duct 20.
Further, each joining end of the bran removal wire net 14 formed so as to be divided into two is bent to form a partition wall 21. This partition wall 21 is located approximately in the middle of the air supply port 17 and the air exhaust port 18, and the bran removal chamber 16 is separated by about 2
Formed to divide.

A supply gutter 24 is connected to the supply port 13 of the leakage table 12, and a supply screw 25 is provided in the supply gutter 24. The pulley 26 fixed to the screw shaft of the supply screw 25 is
It is connected to the motor pulley 28 of V-belt. On the other hand, while opening the discharge port 30 in the upper half of the whitening chamber 29,
Connect the discharge hopper 31 to the discharge port 30
A discharge gutter 32 whose lower end faces the outside of the machine is provided below. Further, in the discharge hopper 31, a resistance lid 33 biased toward the main discharge port 30 is provided. That is, the resistance lid 33 rotatably supported by the shaft 33a is connected to the tooth shaft 36 of the forward / reverse rotation electric motor 35 via the leaf spring 34.

A pulley 37 is attached to the lower end of the hollow shaft 5, and the pulley 37 is a V belt on the motor pulley 39 of the main motor 38.
Connected by 40. The main electric motor 38 and the forward / reverse rotation electric motor 35 are electrically connected to each other through a control circuit (not shown), and the electric current value of the main electric motor 38 corresponds to a current set value input from a separately provided input device. So that the forward / reverse rotation motor 35 rotates forward / reversely to move the leaf spring 34.
A resistance lid 33 is formed around the 33a so as to meet.

The specific operation of the above embodiment will be described below. When raw brown rice is supplied to the supply gutter 24 by a chute pipe or the like (not shown), the raw brown rice is forced to flow from the supply port 13 into the funnel stand 12 by the supply screw 25, and is fed upward by the feed roller 7 to the whitening chamber 29 side. To be done.

The rice grains in the whitening chamber 29 are brought into an appropriate high pressure state by the resistance lid 33 as an external resistance, and are subjected to whitening action by the milling roller 8. That is, the whitening chamber 29 becomes the narrowest by the rotating ridges 9, the rice grains become dense and agitated, and the bran layer is peeled off by the friction between the grains and the friction between the grains and the bran-removing wire net 14. By the way, due to the absorbing power of the debranching fan 19, the wind flowing into the bran removal chamber 16 from the air inlet 17 is entirely due to the presence of the partition wall 21 from the bran wire net 14 on the side of the air inlet 17 into the whitening chamber 29. While invading and cooling the rice grains, the rice bran wire 14 on the side of the air exhaust port 18 is accompanied by the bran powder that has been peeled off by the frictional action.
From the air outlet 18 to the bran 16 through the bran duct 20 to separate the bran from the air by a cyclone collector (not shown), a back filter, or the like. As a result, part of the wind that has flowed into the whitening chamber 29 enters the hollow portion of the milling roller 8 from the ventilation groove 10 of the milling roller 8 and further enters the hollow shaft 5 from the ventilation hole 11 of the hollow shaft 5. The air is exhausted to the outside of the machine through the air intake duct 22. The wind flowing into the ventilation groove 10 immediately removes a part of the bran powder generated by the stirring action of the ridge 9, and the air flowing toward the exhaust port 18 tends to cause a sticking to the surface of the bran removal mesh 14. It attracts the rice grains and activates the stirring and flowing action of the rice grains in the whitening chamber 29. A separator for separating bran and air is also provided in the discharge pipe of the suction fan 23 (not shown).

In this way, the grain of rice subjected to the whitening action is discharged from the discharge port 30 against the resistance lid 33, and taken out of the machine via the discharge hopper 31 and the discharge gutter 32.

In the present embodiment, the partition wall 21 in the bran removal chamber 16 is almost 2
However, the ratio between the wind intake side and the bran removal side can be appropriately selected. Further, without providing the partition wall 21, the suction force from the hollow shaft 5 is increased to increase the ventilation groove of the milling roller 8.
The bran from 10 may be formed to activate. In this case, many ventilation grooves 10 are provided. Further, the feed roller 7 and the milling roller 8 may be provided in reverse, the supply port 13 may be provided at the upper portion, and the discharge port 30 may be provided at the lower portion.

〔The invention's effect〕

As described above, according to the present invention, the air supplied from the air supply port provided in the bran removal chamber is allowed to flow out to the exhaust port through the whitening chamber, and a part of the air is blown from the ventilation groove of the milling roller to the hollow shaft. Since it is formed so as to be sucked and removed through the ventilation holes, the rice grains in the whitening chamber do not stick to the inner wall surface of the bran removal wire mesh, and are smoothly agitated and flowed by the ridges of the milling roller, which makes it even and smooth. There is no occurrence.
In addition to the bran wire mesh, the bran powder generated by the rotation of the ridges is immediately sucked and removed from the ventilation groove into the hollow portion inside the milling roller, so that the bran removing action is improved.

[Brief description of drawings]

1 is a longitudinal side view of an embodiment of the present invention, FIG. 2 is a cross-sectional plan view of the same, FIG. 3 is a partially enlarged view of FIG. 2, FIG. 4 is a partially enlarged plan view of a milling roller, and FIG. The figure is a vertical sectional side view showing a conventional example. 1 ... Vertical type rice milling machine, 2 ... Frame, 3 ... Upper bearing, 4 ... Lower bearing, 5 ... Hollow shaft, 6 ... Plug,
7 ... Feed roller, 8 ... Milling roller, 9
…… Valve, 10 …… Ventilation groove, 10a …… Wire mesh, 11 …… Ventilation hole, 12 …… Funnel stand, 13 …… Supply port, 14 …… Bran mesh, 15
…… Cylinder wall, 16 …… Bran removal room, 17 …… Blower, 18 …… Blowout port, 19 …… Bran fan, 20 …… Bran duct, 21 …… Brank, 22 …… Bath duct, 23 …… Suction fan, 24 …… Supply gutter, 25 …… Supply screw, 26… Pulley, 27 …… Electric motor, 28 …… Motor pulley, 29 …… Whitening chamber, 30 …… Discharge port, 31 …… Discharge hopper , 32 …… discharge trough, 33 …… resistance lid, 33a …… shaft, 34 …… leaf spring, 35 …… forward / reverse rotation motor, 36 …… tooth shaft, 37 …… pulley, 38 …… main motor, 39
...... Motor pulley, 40 …… V belt, 41 …… Cover, 101 …… Shaft, 101 a …… Hole, 102 …… Screw conveyor, 103 …… Rotor, 104 …… Screen, 105 …… Passage, 106… … Extraction device, 107… Exit.

Claims (3)

[Claims] 1. A feed roller communicating with a supply port and a milling roller communicating with a discharge port are axially attached to a hollow shaft rotatably erected with a large number of ventilation holes, and the milling roller is hollow. In addition to providing ridges and ventilation grooves on the peripheral surface, a bran removal wire net surrounding the milling roller is erected to form a whitening chamber, and this bran removal wire mesh is surrounded to form a bran removal chamber. In a vertical shaft type rice milling machine, one end of the hollow shaft is closed and the open end is connected to a suction fan through an air suction duct, and a ventilation port and an exhaust port are opened in the bran removal chamber, and this exhaust port is Is a vertical axis rice milling machine characterized by being connected to a bran removal fan through a bran removal duct. 2. The lower end of the milling roller is connected to the upper end of the feed roller so as to whiten the raw material supplied from the supply port to the discharge port. Vertical type rice milling machine. 3. The vertical shaft rice milling machine according to claim 1 or 2, wherein a partition wall is provided between the air inlet and the air outlet in the bran removal chamber.