JPH023790Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a flour milling device.

[Conventional technology]

The raw material in the raw material supply device is supplied via the raw material supply channel onto multiple crushing rolls with different circumferential speeds, and the crushed material crushed by the rolls is collected by a hopper with an inspection door on the roll part and transported by suction air. Flour milling equipment is known. As an example of this,
The device disclosed in Japanese Patent No. 13782 will be explained based on FIG.

A pair of grinding rolls 5 having different circumferential speeds are disposed in a roll stand 4 made up of left and right frames 1, 1 and front and rear longitudinal walls 2, 3, and this grinding roll 5 is usually connected to the front milling roll. The circumferential speed of the flour milling roll 5a is set higher than that of the rear flour milling roll 5b, and the rear flour milling roll 5b moves back and forth to form an appropriate slit 6 between the two rolls 5a and 5b.

There is a supply hopper 8 for the raw material 7 above the grinding roll 5, and a slit 6 from the supply port 9 of the hopper 8.
A raw material supply flow path 10 is arranged along the entire length of each crushing roll 5, and the raw material 7 in the supply hopper 8 is loosened by a blade wheel 11 and the supply amount is adjusted by a damper 12. It is fed to the slit 6 of the grinding roll 5 by the feed roll 13 .

The raw material 7 supplied to the slit 6 is crushed by a pair of rolls 5a and 5b while passing through the slit 6 to become a powder 14, which is transferred to a hopper 16 equipped with a lower inspection door 15 below the crushing roll 5. fell into
It is suctioned to the next process by suction air through a suction transport pipe 18 connected to a discharge port 17 at the bottom of the hopper 16.

The suction of this suction transport pipe 18 allows the upper inspection door 19 and the air suction port 21 of the front cover 20 to
Air is sucked in from the damper 12,
The raw material 7 is drawn into the upper part of the slit 6 of the crushing roll 5 from the supply port 9 through the raw material supply channel 10 .

As the grinding roll 5 grinds the raw material 7, the roll itself and its surroundings become high temperature, so the supplied raw material 7 becomes high temperature, and the temperature difference between the temperature of the atmosphere above the grinding roll 5 and the atmosphere below is large. When this happens, a phenomenon occurs in which the crushed material condenses.

Therefore, this drawn air is sucked into the hopper 16 through the slit 6, and
The rolls 5a, 5b are rotated relative to the rotation of the rolls 5a, 5b.
The roll itself is kept at a low temperature by being sucked into the hopper 15 from the front and rear of the hopper 15 along the circumference of the roll.

However, when the raw material 7 is crushed by the crushing roll 5, it flies up directly between the rolls 5a and 5b, that is, above the slit 6, so that the air drawn together with the raw material from the raw material supply path 10 becomes a turbulent flow above the slit 6. Twist and soar.

For this purpose, arc-shaped covers 22 and 23 are provided on the rolls 5a and 5b, respectively, and a throttle 24 is provided between the arc-shaped cover 22 and the front roll 5a to prevent air from flowing over the front roll 5a. , an air intake flow path 2 which communicates an arcuate cover 23 disposed along the outer circumference of the rear roll 5b with the upper part of the supply hopper 8 through an opening 25 with a small gap.
The air guide channel 28 formed by the arcuate cover 23 and the roll 5b is placed close to the guide plate 27 of No. 6.
The roll 5b is merged between the rear long wall 3 of the roll stand 4 to prevent it from flying up.

The combined drawn-in air is sucked from behind the roll 5b into the hopper 16 by suction from the suction transport pipe 18, and is sucked into the suction transport pipe 18 together with the powder 14 from the discharge port 17, but the finished state of the flour is When the lower inspection door 15 is opened for inspection, outside air flows into the hopper 16 from this opening. When outside air flows into the hopper 16, the airflow that has been rectified from above to below within the hopper 16 is disturbed, and the powder 14 is scattered.

For this reason, a guide plate 29 is provided along the rear longitudinal wall 3 of the hopper 16 from the lower part of the rear roll 5b to the discharge port 17 to form a suction flow path 30 that is separate from the hopper 16. This prevents the powder 14 from scattering even when the lower inspection door 15 is opened.

[Problem that the invention attempts to solve]

However, if the suction flow path is long, the suction flow will require more air than necessary, and the air flow will be needed for purposes other than transporting raw materials, resulting in an uneconomical energy consumption.Also, the suction flow path and the hopper at the bottom of the roll will be formed on separate routes. If this happens, there will be a large temperature difference between the powder and the suction air, leading to condensation and mold growth.

Therefore, in this invention, when the inspection door is closed, the air from the raw material supply channel is guided directly to the hopper, and when the inspection door is opened, a suction channel is formed and the air is guided to this channel, thereby preventing dew condensation. The purpose is to save labor in suction fan operation by increasing the mixing ratio of pulverized material and air.

[Means for solving problems]

The present invention has been developed in view of the above points, and includes a raw material supply device, a compound crushing roll that crushes the raw material at different circumferential speeds, a raw material supply channel arranged over the entire length of the compound crushing roll, and , a flour milling apparatus equipped with a hopper with an inspection door for collecting and discharging pulverized material, the raw material supply flow path is arranged so that the raw material is supplied onto a grinding roll having a high circumferential speed, and a peripheral A suction flow path is provided from the bottom of the slow-speed grinding roll to the discharge port at the bottom of the hopper, and the suction flow path is opened and closed in conjunction with the opening and closing of the inspection door to allow air from the raw material supply flow path to flow through the suction flow path. The present invention is characterized in that a suction switching damper is provided in the suction flow path when the inspection door is opened and directly leads to the hopper when the inspection door is closed.

〔Example〕

An embodiment shown in FIG. 1 will be described below.

A pair of crushing rolls 35 having different circumferential speeds are disposed within a casing 34 of a roll stand constituted by left and right frames 31, 31, a front cover 32, and a rear partition 33. This crushing roll 3
5 is set so that the peripheral speed of the front flour milling roll 35a is faster than the rear flour milling roll 35b,
At the same time, the rear milling roll 35b moves in the front-back direction to form an appropriate slit 36 between the rolls 35a and 35b.

Above the grinding roll 35, a feeder raw material 37 is provided.
A supply hopper 38 is disposed over the entire length of the crushing roll 35, and a raw material supply adjustment damper 40 is connected to the lower part of the upper raw material flow plate 39 of the hopper 38, and a supply port 41 and a lower part thereof are inclined. A raw material supply roll 43 and a raw material distribution roll 44 are provided along the entire length of the crushing roll 35 between the lower raw material receiving plate 42 and the raw material distribution roll 44 .

Flour milling roll 35 rearward from raw material distribution roll 44
The raw material supply flow path 45 that reaches the peripheral surface of the front milling roll 35a whose circumferential speed is faster than that of the raw material supply guide plate 4
5a and 45b.

A hopper 47 having a lower inspection door 46 is disposed below the crushing roll 35.
The lower part of the hopper 7 protrudes downward from the main body receiving stand 48, and a suction transport pipe 50 is connected to a discharge port 49 at the lower part of the hopper 47.

A gap between the front milling roll 35a of the crushing roll 35 and the front cover 32 is closed by a front closing plate 51, and the air in the hopper 47 rising as the front milling roll 35a rotates. is reversed at the closing plate 51 and is not discharged to the outside. This air reversal has the effect of preventing dew condensation on the front cover 32 and cooling the flour milling roll 35a.

Hopper 47 from the rear of the rear milling roll 35b
A suction passage 52 is formed in the hopper 47 along the partition 33 leading to a discharge port 49 at the lower part of the hopper 47 . This suction flow path 52 is connected to an intermediate fixed guide plate 53, a lower fixed guide plate 54, a suction flow passage switching damper 55 disposed on the upper part of the intermediate fixed guide plate 53, and a lower fixed guide plate 53 and a lower fixed guide plate. It is separated from the hopper 47 by a suction air volume adjusting damper 56 disposed between the suction air volume and the plate 54.

The suction flow path switching damper 55 includes the frame 31,
31 so as to be rotatable about a fulcrum 55a, and its upper end abuts near the rear of the rear milling roll 35b, and its lower end abuts the upper end of the intermediate fixed guide plate 54. Further, the damper 55 has a damper opening/closing weight 57 protruding into the hopper 47 near the fulcrum 55a.

The lower inspection door 46 is provided so as to open outward with the lower part as a fulcrum 46a, and a hook 58 that projects into the hopper 47 is provided inside the lower part. At a position above the hook 58, a suction flow path switching lever 59 is provided on the pedestal 31 so as to be rotatable about a fulcrum 59a. A wire 60 is stretched between the hook 58 and one end of the lever 59, and a damper opening/closing wire 61 is stretched between the other end of the lever 59 and the lower end of the suction flow path switching damper 55. When the lower inspection door 46 is closed, the upper end of the damper 55 contacts the partition 33 as shown by the solid line, the suction passage 52 is closed, and the upper part of the rear milling roll 35b directly communicates with the hopper 47. However, when the inspection door 46 is open, when the suction flow path switching lever 59 is rotated clockwise in the figure via the hook 58 and the wire 60, the damper opening/closing wire 61 is loosened and the damper 55 is opened. The damper is rotated counterclockwise in the figure by the damper opening/closing weight 57 and stands up at the position shown by the chain line, forming a suction flow path 52.
Connects with 2.

The suction air volume adjusting damper 56 rotates inward to the hopper 47 with its upper end as a fulcrum 56a, and adjusts the air volume in the suction flow path 52 by opening as shown by the chain line.

Next, to explain the operation of this device, the feeder raw material 37 in the supply hopper 38 is sent to the raw material supply passage 45 by the raw material supply roll 43 and the raw material distribution roll 44, and through the passage 45, It is supplied to the upper peripheral surface of the front milling roll 35a where the peripheral speed is high. The raw material 37 supplied onto the milling roll 35a is sent to a slit 36 with the roll 35a acting as a feeder, and after passing through the slit 36, it is milled by the milling roll 5 to form a powder 62.
falls into the hopper 47.

The powder 62 that has fallen into the hopper 47 is
9 through the suction transport pipe 50 and transferred to the next process.

Due to the suction from the suction transport pipe 50, air is suctioned from between the upper inspection door 63 and the front cover 32, and this air is sent from the raw material supply channel 45 to the powder in front of the crushing roll 35 along with the raw material 37. It is fed into the upper part of the roll 35a.

The sent air is sucked into the hopper 47 together with the raw material to be crushed through the slit 36, and flows around the rear milling roll 35b against its rotation, while passing through the rear part of the milling roll 35b and the middle partition. 33 into the hopper 47, the high-temperature air generated by the grinding is removed together with the ground material as much as possible, and the milling rolls 35a,
35b itself is cooled to keep the pulverized material at a low temperature.

In this case, since the suction flow path 52 is not formed in a separate route from the hopper 47, the mixing ratio of the pulverized material and air can be increased, and the operating power of the suction fan can be saved.

When the lower inspection door 46 is opened, the suction flow path switching damper 55 rotates counterclockwise in the figure, and the suction flow path 52 is formed as a separate path from the hopper 47, so that the raw material supply flow path 45
The air sent from the rear milling roll 35b
It is sucked into the suction channel 52 from the circumferential surface and into the suction transport pipe 50 through the discharge port 49 . In this case, the air volume in the suction flow path 52 is adjusted by adjusting the opening degree of the suction air volume adjusting damper 56.

In addition, the raw material 37 is fed to a flour milling roll 3 having a high circumferential speed.
Since the powder is supplied to the circumferential surface of the slit 5a, there is less floating of fine powder compared to that supplied onto the slit 36.
The floating fine powder is also removed from the guide plate 45a of the flow path 45,
45b, the milling roll 35
There is no need to provide a special cover over a and 35b, and the fine powder and raw materials that have fallen onto the milling roll 35a, which has a high circumferential speed, are successively supplied between the two rolls 35a and 35b, so the milling roll 35a is cleaned. .

[Effect of idea]

As described above, in the present invention, during normal operation, the suction flow path below the grinding roll is closed by the switching damper, and the air above the grinding roll is sucked directly into the hopper through the bottom of the roll. The pulverized material and air are mixed, and therefore no temperature difference occurs between the pulverized material and the air, and no dew condensation occurs, compared to systems in which the suction channels are always separate. Therefore, no condensation occurs in the lower part of the suction flow path due to the temperature difference with the upper part.

In addition, since the raw material supply channel opens on the milling roll with a high circumferential speed, the roll itself plays the role of supplying the raw material to the slit, and the fine powder produced by crushing the raw material is transferred to the guide plate that forms the supply channel. acts as a cover, so leakage of fine powder can be prevented without the need for a separate cover.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a flour mill showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing an example of a conventional flour mill. 35...Crushing roll, 36...Slit, 39
...Raw material supply hopper, 45 ...Raw material supply channel, 4
6... lower inspection door, 47... hopper, 52...
Suction flow path, 55... Suction flow path switching damper, 59... Lever for damper switching, 61... Wire for damper switching.

Claims (1)

[Scope of utility model registration request] A raw material supply device, a compound crushing roll that crushes the raw material at different circumferential speeds, a raw material supply channel arranged over the entire length of the compound crushing roll, and a hopper with an inspection door for collecting and discharging the crushed material. In the flour milling apparatus, the raw material supply channel is arranged so that the raw material is supplied onto a grinding roll having a high circumferential speed, and a discharge port at the bottom of the hopper is provided in the hopper from below the grinding roll having a slow circumferential speed. A suction flow path is provided in the suction flow path, and the suction flow path is opened and closed in conjunction with the opening and closing of the inspection door, and air from the raw material supply flow path is introduced into the suction flow path when the inspection door is opened, and directly into the hopper when the inspection door is closed. A flour milling device characterized by being provided with a suction switching damper that guides the suction.