JPH0198886A - Combustion controller for burner in cereal grain drier - Google Patents

Abstract

PURPOSE: To sensitively cope with variation in condition of drying operation and further stabilize the drying rate by a method wherein there are provided a burner operating means for repeating combustion and suspension of a burner at every predetermined time, an atmosphere temperature sensor and a combustion control means for increasing or decreasing a combustion period of the burner in response to the measured atmosphere temperature. CONSTITUTION: As a drying operation is started, a burner 13 is ignited, a set value of a feeding amount setting switch 22 is read out and then a combustion time Td of the burner 13 is set in response to the set value. The burner 13 performs combustion only for the set combustion time Td, terminates its operation for a period Ts and repeats it for every time. T. In turn, an atmosphere temperature is measured by an atmosphere temperature sensor 21 and then the measured value is compared with a predetermined value under a predetermined timing. In the case that the measured atmosphere temperature is decreased more than a predetermined value, a combustion time Td which is set at present time is increased in response to its decreasing amount. In turn, when the measured atmosphere temperature is higher than the predetermined value, the combustion time Td is decreased in response to its increasing amount. With such an arrangement, even if the atmosphere temperature varies a specified drying rate can be accomplished.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a grain dryer that dries grains with hot air from a burner while circulating inside the machine.

(Prior art) This type of device uses a type of burner that can only change the combustion amount in stages, such as in three stages, and also uses a burner that can alternate between combustion and stopping. It is known what has been done.

(Problem to be solved by the invention) However, in dryers such as this, where the burner can only change the amount of combustion in stages, and which repeats combustion and pauses, it is difficult to respond in detail to changes in drying conditions. It was found that the drying rate became unstable.

Therefore, it is an object of the present invention to respond precisely to changes in drying conditions, thereby stabilizing the drying loss rate.

(Means for Solving the Problems) In order to achieve the above object, the present invention has the following configuration.

That is, one aspect of the present invention is a grain dryer that dries grains with hot air from a burner while circulating the grains, comprising: a burner operating means that repeats combustion and stopping of the burner at predetermined intervals; and an outside air temperature sensor that measures outside air temperature. and combustion control means for increasing or decreasing the combustion time of the burner in accordance with the measured outside air temperature.

(Function) In the grain dryer, when drying of i grains is started, during the drying operation, the burner 13 alternately repeats combustion and stopping by the burner operating means (see FIG. 4).

On the other hand, during operation, the outside air temperature sensor 21 measures the outside air temperature, and increases or decreases the combustion time Td of the burner according to the measured outside air temperature.

For example, when the measured outside air temperature falls below a predetermined value, the combustion time Td of the burner 13 is increased in accordance with the amount by which the outside air temperature falls below a predetermined value, so that the amount of heating for the grains increases, thereby stabilizing the drying rate. .

(Example) The present invention will be explained based on the example shown in the drawings.
is a storage chamber of a grain dryer, in which a chevron plate 2 with an inverted V-shaped cross section is installed at the center of the bottom, and guiding swash plates 3,
Install 3. Perforated plates 4 are connected to both side edges of the chevron-shaped plate 2 and the lower edges of the guiding swash plates 3, 3, respectively, and a drying chamber 5.5 is formed by a pair of opposing perforated plates 4.

The outlet at the lower end of the drying chamber 5.5 looks into the grain collection chamber 7 at the bottom of the machine through the rotary valve 6, and the delivery end of the grain helix 8 suspended horizontally in the groove in the center is connected to the grain raising @ Connect to the lower intake port of 9. Reference numeral 10 indicates a loading port communicating with the lower intake port of the grain raising machine 9.

Next, the upper outlet of the grain raising 119 is connected to the starting end of the grain feeding spiral 11 installed on the upper part of the machine, and the terminal end of the grain feeding spiral 11 is connected above the diffusion plate 12 suspended in the center of the ceiling plate of the storage room l. Open your mouth.

Then, burners 13 and suction fans 14 are installed facing the front and back of the dryer, and the burners 13 are installed in the drying chambers 5.
The fan 14 is directed into the hot air chamber 15 inside the drying chamber 5.5 and into the exhaust chamber 16 surrounded by the outside of the drying chamber 5.5 and the outer wall of the dryer.

17 is a shielding plate that partitions the hot air chamber 15 and the exhaust chamber 16.

Next, a control system according to an embodiment of the present invention will be explained with reference to FIG.

21 is an outside air temperature sensor for measuring outside air temperature; 22
23 is a grain temperature sensor that measures the temperature of grains; and 24 is a moisture meter that measures the moisture content of grains. be. Each of these outputs is supplied via an input interface 25 to a CPU (central processing unit) 26 in the form of a microprocessor.

The CPU 26 controls each component according to a predetermined procedure as described below. 27 is memory;
A read-only memory (ROM) that stores control procedures for the CPU 26 to control each component, and a random-access memory (RAM) that stores various data.
The CPU 26 includes an output interface 28.
Connect the control target described below via.

29 is an ignition heater for igniting the burner 13, and 30 is a fuel valve for regulating the fuel supplied to the burner 13 by the fuel pump 31. Reference numeral 32 indicates various motors that drive the grain raising machine 9, the suction fan 14, and the like.

Next, an example of the operation of the embodiment of the present invention having the above configuration will be described.

Now, grains are loaded into the storage chamber l, and a value corresponding to the loaded amount is set using the loaded amount switch 22.

Next, when drying starts, the burner 13 is ignited, and the set value of the filling amount setting switch 22 is read.
Depending on this setting value, burners 1 and 3 are set as shown in Fig. 4.
Set the combustion time Td.

During the drying operation, the burner 13 burns for the combustion time Td set in this way, and then stops for the subsequent stop time Ts, repeating these combustion and stop operations every time T. This repetition time T is set to be shorter than the time required for the grain to circulate once in the machine when the minimum loading amount (minimum amount of grain that can be dried) is loaded and dried. This is a fixed value and is stored in the memory 27 in advance.

On the other hand, during the drying operation, the outside air temperature is measured by the outside air temperature sensor 21, and the measured value is compared with a predetermined value at a predetermined timing. When the measured outside air temperature is below a predetermined value, the currently set combustion time T d' is
The amount increases as shown by the broken line in FIG. 4 depending on the amount below.

In this case, it is also possible to keep the combustion time Td constant without increasing it, and to decrease the stop time Td.

On the other hand, when the measured outside air temperature exceeds the predetermined value, the currently set combustion time Td is decreased according to the amount of the exceedance.

As described above, according to this embodiment, the combustion time Td of the burner 13 is made longer as the outside air temperature becomes lower,
Since the amount of heat applied to the grains is increased, a constant drying loss rate can be achieved even if the outside temperature fluctuates during drying.

In addition, in the above embodiment, the combustion time Td of the burner 13 is changed according to the magnitude of the outside air temperature, but instead of this, the combustion time Td of the burner 13 may be changed according to the magnitude of the grain temperature. good.

That is, in this case, the grain temperature is measured by the grain temperature sensor 23, and when the measured grain temperature exceeds a predetermined value, the currently set combustion time Td is decreased according to the amount by which it exceeds.

In addition, the combustion amount of the burner 13 is changed in stages according to the amount of grain loaded, and the degree of combustion of the burner 13 is changed.
The combustion time Td of No. 3 may be increased or decreased.

(Effects of the Invention) As described above, in the present invention, the combustion time of the burner, which is operated by alternately repeating combustion and stopping, is increased or decreased depending on the measured outside temperature. It is possible to respond in detail, thereby stabilizing the drying loss rate even when the outside air temperature is low.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a grain dryer embodying the present invention;
3 is a block diagram of an embodiment of the present invention, and FIG. 4 is a graph showing an example of burner operation. 13 is a burner, 21 is an outside temperature sensor, and 26 is a CPU. Patent applicant: Iseki Agricultural Machinery Co., Ltd. Agent: Tobe Maki (and 2 others) No. 3N: LA Figure 1 Figure 2

Claims (1)

[Scope of Claims] A grain dryer that dries grains with hot air from a burner while circulating the grains, comprising: a burner operating means that repeats combustion and stopping of the burner at predetermined intervals; and an outside air temperature sensor that measures outside air temperature. and combustion control means for increasing or decreasing the combustion time of the burner according to the measured outside air temperature.