JPS6248150B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a temperature control device in a grain cooling device for use in, for example, a rice milling device that continuously mills rice while cooling rice grains to a predetermined temperature. It is.

Prior Art Generally, when rice grains are polished, the rice grains become heated due to frictional heat, etc., resulting in deterioration of the quality of the rice grains.

For this reason, it has been proposed to cool the rice grains in the pre-process of milling, but satisfactory control results have not been obtained.

In addition, a rice polishing method was developed in 1973 that included a low-temperature humidity control device that supplied low-temperature and high-temperature air to the outlet of the rice mill.
This method has been proposed in Japanese Patent No. 45052, but this method does not have a structure that allows grains to be uniformly and efficiently controlled at low temperature and humidity.

Problems to be Solved by the Invention The present invention addresses the above problems and provides a temperature control device in a grain cooling device that uniformly and efficiently cools grains with cold air to provide a satisfactory cooling effect. The purpose is to provide the following.

Means for Solving the Problems The temperature control device in the grain cooling device of the present invention includes a cold air duct which has a grain supply port and a grain discharge port, and which sends an air flow from a cold air generator. In the grain cooling device having a grain cooler communicating with a discharge duct for discharging grains, a temperature sensor for detecting the temperature of the grains is provided on at least one of the supply port side and the discharge port side of the grain cooler. At the same time, an air volume regulating valve opening/closing device is provided in the cold air duct or the discharge duct, and the temperature sensor and the air volume regulating valve opening/closing device are operated by a signal from the temperature sensor to operate the air volume regulating valve opening/closing device. communicating to adjust the air volume of the cold air duct and the discharge duct, and the grain cooler communicates with a plurality of grain flow paths between the supply port and the discharge port, and the cold air duct and the discharge duct. It has a configuration characterized by having a plurality of cold air passages.

Effect When the temperature sensor installed on at least one of the supply port side or the discharge port side of the grain cooler detects the temperature of the grains, and the difference between the grain temperature detected by the temperature sensor and the set temperature is large. To operate the air volume control valve opening/closing device provided in the cold air duct or the discharge duct, increase the air volume of the cold air duct and the discharge duct to a large air volume, and supply the grains from the supply port to the grain cooler,
The grains descending inside the grain cooler are dispersed by multiple grain flow passages between the supply port and the discharge port, and the grains are distributed by a large air volume passing through the multiple cold air passages that communicate with the cold air duct and the discharge duct. When the grain is cooled rapidly and the difference between the grain temperature and the set temperature of the temperature sensor is small,
The air volume control valve opening/closing device is operated to reduce the air volume of the cold air duct and the discharge duct, and the grains descending through the grain flow passage in the grain cooler are cooled with a small air volume passing through the cold air passage.

Embodiments Hereinafter, a rice polishing apparatus equipped with a temperature control device of the present invention will be described in detail with reference to the drawings. Referring to FIG. 1, rice milling equipment is generally designated by the number 1.
The rice milling device 1 includes a temperature control device and a cold air generator (cooler) 11 that adjust the amount of cold air blown in response to the temperature of rice grains to be input. This temperature control device includes an indicator regulator 2, rice grain temperature sensors 9, 10, an air volume control valve 4 (preferably a butterfly valve), a switching device 3 consisting of a rotary solenoid or a deceleration motor for operating the air volume control valve 4, and a suction device. It mainly consists of fan 5.

The direction of flow of the cold air is indicated by arrow A in FIG.

The instruction setting device 2 is provided with elements for displaying a display lamp 18, an upper limit temperature setting section 19, a lower limit temperature setting section 20, an input rice grain temperature display section 21, and an output rice grain temperature display section 22.

In the figure, 7 is a rice lifting machine and 8 is a rice polishing machine. Of course,
The temperature control device can be configured to be adjusted in response to the output rice grain temperature instead of the input rice grain temperature. In the figure, 6 is a grain cooler, and the grain cooler 6 receives the cold air from the cold air generator 11, and the rice grains are sent from the rice miller 8 through the rice lifter 7 to the grain cooler 6. to cool down. Furthermore, although not shown, the rice grains can be humidified between the cold air generator 11 and the grain cooler 6. In that case, an electric valve is used as a humidification nozzle to keep the rice grains at a constant humidity. It is controlled by Temperature sensors 9 and 10 are provided on the grain input side and the grain discharge side of the grain cooler 6, respectively.

Next, referring to FIG. 2, FIG. 2 is a side view of FIG. 1, and in particular, the flow of rice grains is illustrated to be easily understood. The rice milling device 1 includes a first rice milling machine 8, a grain cooler 6, a second rice milling machine 8, and a glazing machine (rice polishing machine) 12 arranged in this order.

In the figure, 13, 14, and 15 are rice lifting machines, 16 is a rice grain circulation tank, and 17 is a switching valve.

Next, the operation of the rice milling apparatus 1 equipped with the temperature control device will be described in detail. First, the switching valve 17 is set so that the rice grains flow into the rice grain recirculation tank 16, and the rice grains are usually continuously introduced from the rice grain loading section 23.
The rice lifting machines 7, 13, 14 and 15 are operated, and the rice polishing machines 8 and 8 are also operated. The suction fan 5 is operated in order to operate the cold air generator 11 to send cold air to the grain cooler 6 to cool the rice grains. Thereby, the cold air is transferred from the cold air generator 11 to the cold air duct 2.
5 to the grain cooler 6. Here, the flow of cold air contacts the rice grains to cool them, and is then discharged from the suction fan 5 through the cold air discharge duct 26 and the air volume control valve 4. In this case, the amount of cold air passing through the grain cooler 6 is regulated by the air amount control valve 4. The air volume control valve 4 is controlled by a temperature sensor 9 that measures the temperature of rice grains input into the grain cooler 6.
Alternatively, the rice grain temperature measured by the temperature sensor 10 that measures the temperature of the discharged rice grains discharged from the grain cooler 6 is guided to the indicating controller 2, and in response to the temperature, a switching device 3 such as a rotary solinoid or a deceleration motor is used. The higher the temperature of the rice grains, the more the air flow control valve 4 is driven.
The opening ratio of the air volume control valve 4 is adjusted so as to release the grain cooler 6, and the amount of cold air passing through the grain cooler 6 is adjusted.
The air volume control valve 4 is preferably in the form of a butterfly valve, and can adjust the air volume in a stepless manner or in several stages, such as three stages. In the case of controlling in three stages, for example, when the temperature of the rice grains being input is higher than the upper limit setting value, the opening/closing device 3 sets the air volume control valve 4 to the fully open position to send the maximum air volume to the grain cooler 6; When the rice grain temperature is below the lower limit set value, the opening/closing device 3 closes the air volume control valve 4 to stop the cold air, or sets it to the slightly open position to send the minimum amount of cold air to the grain cooler 6. The stage of entering
Alternatively, if the temperature of the input rice grains is between the above two values, it can be divided into a stage in which an intermediate air volume is sent to the grain cooler 6.

As described above, rice grains are polished and polished while adjusting the amount of cold air in response to the temperature of the rice grains.

The flow of rice grains is indicated by arrow B in FIG. That is, the rice grains are loaded into the rice polishing device 1 from the rice grain loading section 23, sent to the first rice polishing machine 8 by the rice lifting machine 13, and then transferred to the rice lifting machine 7 in the polished state.
The grains are sent to the grain cooler 6 by the grain cooler 6. Here, the rice grains are cooled by the cold air, humidified by a humidifier (not shown), and sent to the second rice milling machine 8.

The rice grains are completely polished here and lifted by a rice lifter 14, and then passed through a switching valve 17 to a circulation tank 1.
6 or sent to a glazing machine (rice polishing machine) 12. Normally, the rice grains are circulated through the circulation tank 1 by the switching valve 17 from the start of the rice milling device 1 until it reaches a steady state.
6, and from there it is fed into the first rice mill 8 and circulated. When the steady state is reached, the changeover valve 17 is switched to feed the rice grains into the glazing machine 12, and after polishing, the rice grains are taken out from the takeout port 24 through the rice lifter 15.

3 and 4 show details of the first embodiment of the grain cooler 6, in which the lower end is opened and the open part 28 is opened.
A fluidized bed 30 consisting of a wall body with a closed part 29 bent at the upper end is arranged in multiple rows and stages, and is placed alternately up and down in a container 33 with a supply port 31 at the top and a discharge port 32 at the bottom. A plurality of grain flow passages are formed between the supply port 31 and the discharge port 32, and the open portions 28 at the lower ends of the respective flow beds 30 are arranged in a staggered manner. Cold air duct 2
The cold air duct 2 is connected to the cooling chamber 34 through the air supply section 35, and the open section 28 at the lower end of each of the remaining fluidized beds 30 is connected to the exhaust section 36 through the exhaust chamber 37.
5 and a discharge duct 26 are provided, and the discharge port 32 is connected to the rice grain supply port of the rice milling machine.

Therefore, the grain cooler 6 is
When the rice grains supplied to the grain cooler 6 descend, they are separated by the closing portions 29 at the upper ends of the plurality of flowbeds 30 and flow down through the plurality of grain flow paths between the respective flowbeds 30. The lower ends of the plurality of alternately arranged fluidized beds 30 are stirred and cooled by the cooling air supplied to the open portion 28 from the cold air generator 11, and are discharged from the discharge port 32.

The air that is supplied from a plurality of alternately arranged fluidized beds 30 and has finished cooling and humidifying the rice grains is discharged to the outside from the exhaust section 36 via the open portion 28 at the lower end of each of the remaining fluidized beds 30.

In this cooling device, the rice grains are cooled while being sufficiently stirred while flowing down, so that the whole grain is cooled uniformly.

5 and 6 show details of a second embodiment of the grain cooler 6, in which a plurality of ventilation porous walls 38 are installed in parallel at appropriate intervals inside a container 37 for cooling. The chambers 39A, 39B, 39C, and 39D are further arranged in parallel to form air supply chambers 41A, 41B that communicate with the air supply section 40 and exhaust chambers 43A, 43B, and 43C that communicate with the exhaust section 42 between them. Arrange. There is a rice grain supply port 44 at the top of the container 37.
In addition, a rice grain discharge port 45 is provided at the bottom, a plurality of grain flow paths are formed between the rice grain supply port 44 and the rice grain discharge port 45, and the rice grain discharge port 45 is connected to the rice grain supply port of the rice milling machine. .

From the rice grain supply port 44 of the container 37 to the cooling chamber 39A,
39B, 39C, and 39D, respectively, and the rice grains flowing down are supplied from the air supply section 40 to the air supply chambers 41A, 41B.
The cold air flowing into the cooling chambers 39A, 39B, 39C, and 39D is supplied through the ventilation porous wall 38,
The whole rice grains are uniformly rapidly cooled through a plurality of cold air passages communicating with a cold air duct 25 and a discharge duct 26, and then exhausted from exhaust chambers 43A, 43B, and 43C through an exhaust part 42. Cold air is supplied to the air supply section 40 from the cold air duct 25.

7 and 8 show details of a third embodiment of the grain cooler 6, in which pipes 46 are arranged in multiple stages and rows, with a supply port 47 at the top and a discharge port 48 at the bottom.
A plurality of grain flow paths are formed between each pipe 46 between the supply port 47 and the discharge port 48, and one end of each pipe 46 is arranged vertically in a staggered manner in a container 49 provided with communicates with the cold air duct 25 via the air supply part 50, and the other end communicates with the exhaust duct 26 through the exhaust part 51, forming a plurality of cold air passages communicating with the cold air duct 25 and the exhaust duct 26,
The discharge port 48 is connected to the grain supply port of the rice mill.

Therefore, the grain cooler 6 is
The rice grains supplied into the grain cooler 6 are separated by a plurality of pipes 46 as they descend into the grain cooler 6, and while flowing down a plurality of flow paths between the pipes 46, they are cooled by the cold air flowing through the pipes 46. It is cooled by heat exchange.
In this case, the cooling air in each pipe 46 does not come into direct contact with the rice grains.

In addition, as a modification of each of the above embodiments, the bed 30 and the pipes 46 may be arranged at an angle or intersected, or the pipes 46 may be arranged vertically to direct the cold air in the direction of the flow of rice grains. It may be allowed to flow in a stream, or an appropriate combination of a ventilation porous wall 38, a flow bed 30, and a pipe 46 may be used.

Effects of the Invention As described above, according to the temperature control device in the grain cooling device of the present invention, the grain temperature can always be cooled to a desired temperature and subsequent processing can be performed. The quality of the grains obtained by this method is not deteriorated by heat generation or the like. Moreover, the purpose can be achieved with a simple device that only adjusts the amount of cold air, and it can be operated continuously, requires no manpower, and is extremely economical and inexpensive.

In addition, when cooling the grains, the larger the difference between the grain temperature detected by the temperature sensor installed on at least one of the supply port side or the discharge port side of the grain cooler and the set temperature of the indicator controller, the cold air is used. This is done by widening the air volume control valve opening/closing device provided in the duct or discharge duct to increase the volume of air in the cold air duct and discharge duct, thereby increasing the temperature of the cooling air sent to the grain cooler.

If the cooling capacity of the cold air generator is constant, as the amount of cold air generated increases, the temperature of the cold air increases accordingly, so the grain temperature detected by the temperature sensor and the setting of the indicator controller are The larger the difference between the temperature and the grain cooler, the more the grains flowing down the grain flow path in the grain cooler are cooled by relatively high-temperature, large-volume cold air that passes through the cold air passage connected to the cold air duct and the discharge duct. In addition, the smaller the difference between the grain temperature detected by the temperature sensor and the set temperature of the indicator controller, the more the grains flowing down the grain flow path in the grain cooler are The grains are cooled with relatively low-temperature, small-volume cold air that passes through the cold-air passage connected to the cold-air duct and discharge duct, eliminating unnecessary energy consumption and ideally cooling grains according to grain temperature. .

In particular, in the grain cooling device of the present invention, grains are supplied from the supply port into the grain cooler, and are dispersed while descending through a plurality of grain flow paths between the supply port and the discharge port. The cooling air is cooled by the cooling air passing through the plurality of cold air passages communicating with the cold air duct and the discharge duct, so that the cooling is uniformly, quickly and efficiently.

[Brief explanation of the drawing]

FIG. 1 is a side view of a rice milling device equipped with a temperature control device in a grain cooling device according to an embodiment of the present invention, FIG. 2 is a front view of FIG. 1, and FIG. FIG. 4 is a partially cutaway front view of the grain cooler of the first embodiment, FIG. 4 is a partially cutaway side view of FIG. 3, and FIG. 5 is a partially cutaway side view of the grain cooler of the second embodiment of the present invention. 6 is a partially cutaway side view of FIG. 5, FIG. 7 is a partially cutaway front view of the grain cooler of the third embodiment of the present invention, and FIG. 8 is a partially cutaway side view of the grain cooler of the third embodiment of the present invention. FIG. 7 is a partially cutaway side view of FIG. 7; 1...Rice polishing device, 2...Instruction controller, 3...Opening/closing device, 4...Air volume control valve, 5...Suction fan,
6...Grain cooler, 7...Rice frying machine, 8...Rice polishing machine, 9, 10...Rice grain temperature sensor, 11...Cold air generator, 12...Glazing machine, 1
3, 14, 15...Rice lifting machine, 16...Recirculation tank, 17...Switching valve, 18...Display lamp, 19
... Upper limit temperature setting section, 20 ... Lower limit temperature setting section,
21... Input rice grain temperature display section, 22... Discharge rice section temperature display section, 23... Rice grain loading section, 24... Output port, 25... Cold air duct, 26... Discharge duct,
28...opening part, 29...blocking part, 30...fluid bed, 31...supply port, 32...discharge port, 33...
Container, 34...Cooling room, 35...Air supply section, 36...
...exhaust section, 37...exhaust chamber, 38...porous ventilation wall, 39A, 38B, 39C, 39D...cooling chamber, 40...air supply section, 41A, 41B...air supply chamber, 42...exhaust section , 43A, 43B, 43C...
...exhaust chamber, 44...rice grain supply port, 45...rice grain discharge port, 46...pipe, 47...supply port, 48...
...Discharge port, 49...Container, 50...Air supply section, 51
...Exhaust section.

Claims (1)

[Claims] 1. In a grain cooling device having a grain supply port and a grain discharge port, and having a grain cooler communicating with a cold air duct that sends an air flow from the cold air generator and a discharge duct that discharges the air flow, A temperature sensor for detecting the temperature of grains is provided on at least one of the supply port side and the discharge port side of the grain cooler, and an air volume control valve opening/closing device is provided in the cold air duct or the discharge duct, and the temperature sensor and an air volume regulating valve opening/closing device in communication with the air volume regulating valve opening/closing device to operate the air volume regulating valve opening/closing device according to a signal from the temperature sensor to adjust the air volume of the cold air duct and the discharge duct, and the grain cooler: A temperature control device in a grain cooling device, comprising a plurality of grain flow paths between the supply port and the discharge port, and a plurality of cold air passages communicating with the cold air duct and the discharge duct. .