JPH0214751A - Method for drying undried and unpolished rice - Google Patents

Abstract

PURPOSE:To reduce damage by mixing unpolished rice with absorbed moisture into unhulled rice dried at prescribed moisture value and drying the mixture while circulating and fluidizing this mixture. CONSTITUTION:Unhulled rice to be dried is fed from a feed hopper 2. When a dryer is started, unhulled rice is finished at prescribed water value by repeating hot-air drying and tempering while unhulled rice is circulated in the machine. Just after a burner 7 is stopped, cooling time is kept several hours and after proper time elapses, a discharge chute 14 is connected with the feed funnel 21 part of a husking sorting machine 15 and the stop valve of a transfer gutter 13 is opened to discharge unhulled rice. This unhulled rice is received in the husking sorting machine 15 side and husking sorting treatment is performed. Unpolished rice taken out from a finished rice thrower 23 is fed to a weighing bagging machine 24 and bagged. Thereby absorption of moisture can be obviated.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for drying undried brown rice.

[Prior art and the problem to be solved by the invention] - After the drying of unhulled rice using a dryer is completed, the hulling operation is carried out after a certain period of time, but the moisture content of the finished brown rice recovered during this hulling operation is abnormally high. In some cases, the culm becomes difficult to detach and the work has to be stopped.

However, grains that have already been turned into brown rice have a high moisture content, so they cannot be sold as is, and must be dried by a method such as sun drying, which is troublesome. In addition, disposing of the product results in waste and impairs productivity.

[Means to solve the problem]

This invention attempts to eliminate the above-mentioned drawbacks and takes the following technical measures. That is, undried brown rice is prepared by mixing undried brown rice that has been subjected to F7 removal processing or brown rice that has regained moisture due to outside air conditions, etc. to unhulled rice that has been dried to a predetermined moisture content and drying it while circulating and flowing it. This is the composition of the drying method.

[Operation and effect of the invention]

The unhulled rice that is appropriately placed in the dryer is dried until it reaches a predetermined moisture content. Next, the rice is hulled and sorted using a huller and sorter, but the temperature of the unhulled rice rises immediately after drying and is not suitable for hulling, so the hulling process is carried out after a cooling period and waiting for the temperature to drop. Start.

By the way, in the above-mentioned series of unhulled rice preparation processes, if a cooling period is allowed during the transition from the drying process to the culling and sorting process,
Depending on the outside air conditions, a so-called moisture return phenomenon occurs. In other words, if the outside air humidity is high, unhulled rice that should have been finished at 15% absorbs moisture to reach a state in equilibrium with this, for example, 16%.
Return to about %.

If this rice with moisture content is removed from the F4 process, it is not suitable as rice for sale, and therefore, when the measured moisture value appears higher than the expected moisture value, it is a case where the moisture content has recovered as described above. Brown rice that has already been hulled and sorted is returned from the hopper 2 to the dryer 1, mixed with undischarged unhulled rice, and dried while being circulated inside the machine.

Therefore, the above-mentioned drawbacks can be solved. Particularly, when the brown rice that has been packed in later is mixed with the unhulled rice and slowly dried, the outer skin part of the unhulled rice functions as a buffer material, Damage caused by the circulatory system of the grain lifting machine 3 etc. can be reduced.

〔Example〕

An embodiment of this invention will be described based on the drawings.

Reference numeral 1 denotes a circulating dryer, in which a predetermined amount of unhulled rice is stored in a storage tank 5 inside the machine frame from a loading hopper 2 via a grain lifting machine 3 and an upper transfer spiral 4 while flowing down drying passages 6, 6. It is configured to dry by blowing hot air generated by a burner 7 or a suction fan 8. 9° 9 is a feeding valve, 10 is a lower transfer spiral, which collects the dried paddy rice and transfers it to the above-mentioned grain lifting machine 3. The structure is such that it is reduced and refined via the upper transfer spiral 4.

Reference numeral 11 denotes a moisture meter, which receives sample grains from the middle of the grain lifting machine 3, measures the moisture content at predetermined intervals, and outputs the signal to the control panel 12. The control panel 12 is equipped with switches for filling, drying, discharging, stopping, etc. on its surface, as well as a filling amount setting switch, finishing moisture setting switch, etc. It stores control programs necessary for drying control, and takes in information on selection of these switches, measurement information on the moisture meter 11, and information on abnormality detection sensors installed in other parts.

It is configured to output a hot air temperature setting signal for the burner 7, a control signal for each drive motor, etc.

A discharge chute 14 is connected to the transfer start end side of the transfer gutter 13 that houses the upper transfer spiral 4, and the lower part of the transfer gutter 13 is opened using an on-off valve (not shown) to discharge the dried paddy rice to the outside of the machine. It is configured so that it can be done.

Reference numeral 15 denotes a hulling and sorting machine, which rotates a culling section 17 having a pair of culling rolls 16° 16, a box-shaped wind sorting section 18, and a sorting barrel 19 forming a large number of pot holes on the inner peripheral surface. It consists of a rotary sorting section 20 and the like, which receives dried unhulled rice from a supply funnel 21 and deculls it.

The mixed rice from which chaff and immature rice have been removed is separated into paddy and brown rice in a rotating sorting section 20.

22 is a mixed rice thrower for supplying the mixed rice to the rotary sorting section 20, and 23 is a finished rice thrower for recovering the finished brown rice from the rotary sorting section 20 to the outside of the machine.

24 is a hopper 25 at the outlet of this finished rice thrower 23.
A weighing and bagging machine installed with a view of the machine includes a rotating sieve screen 26 and a single-rotation grain frying spiral 27 for separating and removing millet during the internal transfer process.
Consists of etc. Reference numeral 28 denotes a weighing stand which outputs a weighing signal to a built-in control unit (not shown) so as to close a shutter 30 at the bottom of the hopper 29 when the brown rice stored in one bag reaches a predetermined weight.

The action of the upper side will be explained.

The finished moisture value is set in advance to 15%, and the unhulled rice to be dried is loaded from the loading hopper 2. When the dryer is started, the unhulled rice is repeatedly dried and tempered with hot air while being circulated within the dryer, until it reaches the predetermined moisture content.

Immediately after the burner 7 is stopped, the temperature of the unhulled rice is high and there is a risk of quality deterioration if it is subjected to hulling. The transfer funnel 13 is connected to the supply funnel 21, and the on-off valve of the transfer gutter 13 is opened to discharge the unhulled rice.

The hulling and sorting machine 15 side receives this unhulled rice and performs culling and sorting processing. The brown rice taken out from the finished rice thrower 23 is
Only the sized brown rice, which is supplied as it is to the weighing and bagging machine 24 and from which small rice has been removed, is packed into bags, for example, every 30 kg.

By the way, in the above series of unhulled rice preparation steps.

If a cooling period is allowed during the transition from the drying process to the culminating/sorting process, a so-called moisture return phenomenon may occur depending on the outside air conditions. That is, when the outside air humidity is high, unhulled rice that is supposed to be finished at 15% absorbs moisture and returns to about 16%, for example.

If this undiluted rice is subjected to desiliconization treatment, it is not suitable as rice for sale, and therefore the following treatment is carried out. In other words, the moisture value of the brown rice taken out from the weighing and bagging machine 24 can be measured using a portable moisture meter (not shown) that is available everywhere, or when adding an external measurement function to the moisture meter 11, use this moisture meter. Measure using 11.

If this measured value appears higher than the expected moisture value,
In this case, the brown rice that has already been packed into bags is returned to the top of the dryer from the loading hopper 2, mixed with undischarged unhulled rice, and dried while being circulated inside the machine. At this time, if you want to additionally dry the remaining paddy rice in the dryer 1 to reach the expected moisture content or slightly overdry, it is not necessarily necessary to start the burner 7, but you can directly feed the undried brown rice without performing additional drying. When necessary, it is preferable to generate hot air from the burner 7 at a low temperature while circulating the air.

When the brown rice that has been packed in later is mixed with the hulled rice and slowly dried, the outer skin part of the hulled rice in particular functions as a buffer material, and the feed valves 9, 9. Vertical transfer spiral 4, 10, grain lifting machine 3
damage caused by this can be reduced.

In the above embodiment, the dryer 1 was used to mix brown rice and dried unhulled rice to reduce the moisture content of the undried brown rice.
If the state of moisture recovery is extremely slow, store the grained brown rice separately, and when supplying new brown rice that has been dried and desiliconized with an appropriate moisture value to the weighing and bagging machine 24, use the undried brown rice. It is best to add it gradually and mix it with brown rice that has an appropriate moisture content to eliminate moisture retention.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, with FIG. 1 being a sectional side view of the whole, and FIG. 2 being a perspective view of the circulation dryer. In the figure, 1 is a circulating dryer, 2 is a tension hopper, 3 is a grain lifting machine, 4 is an upper transfer spiral, 5 is a storage tank, 7 is a burner, 8
is a suction fan, 9, 9 is a delivery valve, 10 is a lower transfer spiral, 11 is a moisture meter, 12 is a control panel, 13 is a transfer gutter, 14
1 is a discharge chute, 15 is a huller and sorter, 16.16 is a desiliconization roll, 17 is a dehulling section, 18 is a wind sorting section, 19 is a sorting barrel,
20 is a rotary sorting section, 21 is a supply funnel, 22 is a mixed rice thrower, 23 is a finished rice thrower, 24 is a weighing bagging machine, and 28 is a weighing stand.

Claims (1)

[Claims] A method for drying undried brown rice, in which undried brown rice that has been dehydrated or brown rice that has regained moisture due to outside air conditions is mixed in unhulled rice that has been dried to a predetermined moisture level and dried while circulating and flowing. .