JPH07111307B2 - Grain drying control system of grain dryer - Google Patents

Description

TECHNICAL FIELD The present invention relates to a grain drying control system for a grain dryer.

[Problems to be Solved by Prior Art and Invention]

Conventionally, a mode is known in which the hot air temperature generated by the burner is suppressed so that the temperature does not exceed a predetermined limit value while detecting the temperature of the grain during drying (grain temperature) (for example, JP-A-58-1).
87779).

However, it is not convenient to set the set grain temperature to a constant value. Generally, this set grain temperature tries to prevent adverse effects caused by abnormally high grain temperature, but if it is too effective, the drying speed will be too slow and the working time will be lengthened. It is usually set. For example, when the ratio of green rice mixed in the grain during drying is high, the drying time can be shortened by raising the temperature of the grain too much, but moisture transfer in the grain is activated, and blue rice with high moisture content Moisture transfer to sieving also becomes active, resulting in a so-called barrel cracking phenomenon, resulting in deterioration of quality. When the grain temperature rises, the water removal effect also increases, and the water gap between the sized rice and the green rice increases, further promoting the above tendency.

[Means for Solving the Problems]

The drying control device 35 is configured to dry the grains in the drying chamber 2 while flowing down the grains by the hot air generated from the burner 1 until the preset target moisture value is reached, and the grain temperature of the grain being dried is detected. The grain temperature sensor 4 is provided with the temperature sensor 4.
In the fuel control device 36 for controlling the temperature of the hot air generated by the burner 1 such that the detected grain temperature detected by the burner 1 becomes substantially the same as the preset grain temperature when it exceeds a preset grain temperature, Green rice mixing ratio calculating means for calculating the ratio of green rice mixed in the inside, comparing means for comparing this green rice mixing ratio with a preset setting green rice mixing ratio, calculated blue rice mixing ratio is set green rice mixing ratio The grain drying control system of the grain dryer is provided with grain temperature lowering means for reducing the temperature of the generated hot air by a predetermined temperature.

[Operation and effect of the invention]

During drying, the hot air temperature of the burner 1 is set to a temperature required for drying the grain, while the temperature of the grain being dried is detected by the grain temperature sensor 4, and compared with the preset grain temperature set in advance, When the temperature is equal to or lower than the set grain temperature, the hot air temperature is continuously dried as it is, but when the temperature is higher than the set grain temperature, the fuel control device 36 controls to reduce the fuel supplied to the burner 1 so that the set grain temperature becomes the same. Let In addition, the green rice mixing rate is calculated, and when the calculated green rice mixing rate exceeds a preset green rice mixing rate, a command signal of the fuel control device 36 is output to further reduce the supplied fuel.

Therefore, the burning rate of the burner 1 is further reduced from the set grain temperature state by the mixing ratio of green rice to promote the reduction of the grain temperature, and the drying speed is slightly slowed. In the case of a high ratio of green rice, water transfer between grains is active and promotes cracking of the sizing. However, the grain temperature can be lowered by reducing the combustion state as described above. It is possible to prevent the deterioration of quality by suppressing the expansion of the water content difference between rice and sized rice.

〔Example〕

 An embodiment of the present invention will be described with reference to the drawings.

The machine wall 6 of the dryer 5 has a rectangular shape in plan view which is long in the front-rear direction.
The front wall plate includes front and rear wall plates, and left and right wall plates. The front wall plate is provided with an operating device 7 for operating the dryer 5 such as starting and stopping, and a burner case 8 having the burner 1 installed therein. Is equipped with a blower 9.

At the center of the lower part of the machine wall 6 is provided a grain collecting trough 10 having a transfer spiral installed in the longitudinal direction, and a drying chamber in which a feeding valve 11 is rotatably supported at a lower position on the grain collecting trough 10. Two are piled up. The drying chambers 2, 2 are formed in a left-right pair, and a hot air chamber 12 communicating with the burner 1 is formed between them. Reference numeral 13 is a hot air temperature sensor provided in the hot air chamber 12. Above drying room 2,2
The exhaust chambers 14, 14 are formed on the outer side of, and the exhaust fan 9 is communicated therewith.

Reference numeral 15 denotes a motor provided below the rear wall plate of the machine wall, which is configured to rotate and interlock the transfer spiral, the feeding valves 11, 11 and the exhaust fan 9.

A fuel valve and a fuel pump 18 are provided on the lower outside of the burner case 8 so that the fuel adjusted to a predetermined flow rate can be supplied to the burner 1 by these operations.
Further, the blower 18 and the motor are provided on the upper plate side of the burner case 8.
19 is provided. The blower 18 is configured to supply combustion air into the burner 1.

A storage chamber 20 is provided above the drying chambers 2, 2 and the storage chamber 2
An upper transfer gutter 22 that houses a transfer spiral is provided on the ceiling plates 21 and 21 of 0. Reference numeral 23 denotes a diffuser, which is configured to receive and scatter the grains from the upper transfer gutter 22.

24 is in front of the machine wall 6 and has a bucket conveyor inside.
In the grain raising machine which stretches the belt of 25 between the upper and lower pulleys, the upper side communicates with the starting end of the upper transfer gutter 22 via the throwing tube 26, and the lower end side with the end of the grain collecting gutter 10. A supply gutter 27 is provided between them for communication. A motor 28 is fixed in the middle of the elevator 24,
The bucket conveyor 25 belt, the transfer spiral in the upper transfer gutter 22 and the diffuser 23 are interlocked in rotation.

Reference numeral 4 denotes a moisture sensor provided substantially in the upper and lower central portions of the elevator, and 3 denotes an inner wall portion of the supply gutter 27, which has a configuration capable of detecting the grain temperature of the passing grain.

The moisture sensor 4 is configured to introduce a falling grain in the grain being transferred upward by the bucket conveyor 25 and detect the moisture value while crushing. The moisture sensor 4 has a structure in which the motor 29 is rotationally interlocked with each other to start each part of the sensor 4 based on a transmission signal transmitted from the operation device 7 at a predetermined time interval.

On the surface plate of the operating device 7, a start switch 30 for starting and stopping, a stop switch 31, a target moisture setting knob 32 for setting a finish target moisture value of grain, and a hot air temperature generated from the burner 1 are set. Hot air temperature setting knob 33, moisture sensor 1
The display unit 34 alternately displays the detected value of 3 and the hot air temperature. Meanwhile, a control device 35 and a fuel control device 36 are formed inside. For example, the hot air temperature generated from the burner 1 is set when the setting knob 33 is adjusted to the grain amount (display number of the display window formed by the front wall plate).

Further, the fuel control device 36 inputs from the A / D converter 37 for A / D converting the detection signals from the hot air temperature sensor 13 and the grain temperature sensor 3, the input circuits 38 and 39, and these input circuits 38 and 39. CPU4 that performs arithmetic logic operation and comparison operation on various input values
0, an output circuit 41 that receives various commands from the CPU 40 and outputs the commands.

The control device 35 includes an A / D converter 42 for A / D converting the detection value detected by the moisture sensor 4, an input circuit 43, and each switch 3
An input circuit 44 that receives the input signals of 0, 31 and the setting knob 32 is configured, and various input values from these input circuits 43, 44 are configured to perform arithmetic logic operation and comparison operation by the CPU 40. 45 is an output circuit.

The fuel control device 36 has the following functions. When the set value of the hot air temperature setting knob 33 is input to the fuel control device 36 on condition that the start switch 30 and the target moisture setting knob 32 are input to the control device 35, the hot air temperature of the burner 1 is set. . During drying, the grain temperature detected by the grain temperature sensor 3 is compared with a preset grain temperature, and if the detected grain temperature> the set grain temperature, the number of times the fuel valve is opened and closed is reduced to reduce the amount of fuel supplied. The grain temperature is controlled to be less than the set grain temperature.
For example, when the set grain temperature of rice grain is 38 ° C and the detected grain temperature is 42 ° C, the fuel supply amount is controlled to decrease to 38 ° C. On the contrary, when the detected grain temperature <the set grain temperature, the temperature is controlled to secure the hot air set temperature (grain temperature control means).

The control device 35 has the following functions. On the condition that the target moisture setting knob 32 and the start switch 30 are operated, a trajectory signal for rotating the motors 15, 19, 28, 29 of the dryers 5 is output. When the grain moisture value detected by the moisture sensor 4 reaches the finishing target moisture value, a stop signal is output to the dryer 5.

The moisture sensor 4 is configured to calculate an average value based on the moisture value of a detected grain of a predetermined grain number (for example, 36 grains), and the target of the moisture value higher than the average value obtained by this calculation is 1% or more. The ratio of green rice can be calculated based on the number of detected grains, and the grain temperature set by the grain temperature control means is changed up and down based on the value of the ratio of green rice. In the above example, if the detected grain temperature> the set grain temperature, and the ratio of green rice is very high (for example, if it exceeds 30%),
The fuel control device 36 further controls the reduction of fuel corresponding to a predetermined temperature (for example, 5 ° C.) (grain temperature lowering means). These numbers store the best values obtained from the test results.

The operation of the above example will be described.

Operate each setting knob 32, 33 of the operating device 7 to the predetermined position,
By turning on the start switch 30, each part of the dryer 5 is started. The hot air from the burner 1 is set to a preset temperature, and the hot air flows from the hot air chamber 12 to the drying chamber 2 to dry the grain.
The dried grains are collected in the grain collecting trough 10, traversed by a transfer spiral, and then supplied to the grain raising machine 24 via the supply gutter 27.
In the grain raising machine 24, it is conveyed up and supplied to the diffusion board 23 through the upper transfer gutter 22. Grains that are evenly dropped by the rotation of the diffusion plate 23 are conditioned in the storage chamber 20. When such a process is repeated and the detection value of the moisture sensor 4 reaches the preset target moisture value or less, the control device
35, the dryer 5 operation is automatically stopped.

During the above drying operation, the grain temperature sensor 3 detects the grain temperature 2. This detected grain temperature is compared with the preset grain temperature. When the detected grain temperature> the set grain temperature, the fuel supply amount is reduced by the grain temperature control means of the fuel control device 36 to a predetermined amount, the hot air temperature is lowered, the rise of the grain temperature is suppressed, and the decrease is also shown. Drying can be continued within a safe range where there is no risk of quality deterioration such as cracking of the body.

Further, if the mixing ratio of green rice is more than a predetermined value according to the detection result of the moisture sensor 4, in addition to the above, the fuel supply amount is further reduced by a predetermined temperature, and the hot air temperature is lowered. Therefore, the grain temperature can be changed to a relatively low temperature even if the water content is significantly varied due to the mixture of green rice, and the influence of cracking of the barrel or the like is small.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a block diagram, FIG. 2 is a flow chart diagram, FIG. 3 is an overall front view of a dryer with a partial cross section, and FIG. 4 is a partial cross section. FIG. 5 is an enlarged front view of a part of the dryer, which shows the entire dryer. 1 ... Burner, 2 ... Drying room, 3 ... Grain temperature sensor, 4 ...
... Moisture sensor, 5 ... Dryer, 6 ... Machine wall, 7 ... Operating device, 8 ... Burner case, 9 ... Air blower, 10 ... Grain collector, 11 ... Feeding valve, 12 ... Hot air chamber, 13 ... Hot air temperature sensor, 14 ... Exhaust chamber, 15 ... Motor, 16 ... Fuel pump, 17 ... Fuel tank, 18 ... Blower, 19 ... Motor,
20 ... Storage room, 21 ... Ceiling plate, 22 ... Upper transfer gutter, 23 ...
… Diffuser, 24 …… Grain elevator, 25 …… Bucket conveyor, 26
…… Spout tube, 27 …… Supply gutter, 28 …… Motor, 29 …… Motor, 30 …… Start switch, 31 …… Stop switch, 32 ……
Target moisture setting knob, 33 ...... Hot air temperature setting knob, 34 ...
... Display window, 35 ... Control device, 36 ... Fuel control device, 37 ...
… A / D converter, 38 …… input circuit, 39 …… input circuit, 40…
… CPU, 41 …… output circuit, 42 …… A / D converter, 43 …… input circuit, 44 …… input circuit, 45 …… output circuit

Claims (1)

[Claims] 1. A drying control device 35 for drying the grains in the drying chamber 2 while flowing down the grains until the preset target moisture value is reached by the hot air generated from the burner 1,
When the grain temperature sensor 4 for detecting the grain temperature of the grain being dried is provided and the detected grain temperature detected by the grain temperature sensor 4 exceeds a preset grain temperature, the grain temperature sensor 4 is set to be substantially the same as the preset grain temperature. In the fuel control device 36 for controlling the temperature of the hot air generated by the burner 1, green rice mixing ratio calculation means for calculating the ratio of green rice mixed in the grain, and this green rice mixing ratio is preset. Comparison means for comparing with the set green rice mixing ratio, when the calculated green rice mixing ratio exceeds the set green rice mixing ratio, the grain of the grain dryer provided with grain temperature lowering means for decreasing the temperature of the generated hot air by a predetermined temperature Grain drying control method.