JPS59202384A - Controller for combustion of burner in circulation type cereal grain drier - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention In a circulating grain dryer, as long as the operating speed of the grain transfer device that circulates the grain in the machine is constant and the temperature of the hot air is constant, the grain The smaller the amount of grains packed, the
The reduction value of the moisture content of the grain per unit time, that is, the drying loss rate becomes large, and in the case of a small amount of grain, rapid drying causes shell cracking.

Conventionally, when the amount of grains packed in grains was small, the fuel in the burner was throttled to lower the hot air temperature for drying, but when the outside temperature was high, the hot air temperature could not be lowered sufficiently. ,
Another drawback was that if the fuel was reduced below the burner's rating, the combustion state would become unstable.

For this reason, a method has been proposed in which both the burner and the grain transfer device are intermittently stopped at the same time.
In this case, the number of stops is several dozen times from the start to the end of drying, and it is necessary to start the grain transfer equipment frequently, so the power supply voltage may drop due to overload that occurs at startup. The disadvantage is that the grain transporting equipment often falls down, and the transmission belts and bearings of the grain transporting equipment are subject to considerable wear and tear.

The present invention improves this drawback by stopping only the burner intermittently for a predetermined period of time depending on the amount of grain packed in, so that the same ideal drying can be achieved regardless of whether the amount of grain stuffed is large or small. The purpose is to dry grains at a reduced rate and also to avoid wear and tear on grain transport equipment.

7] (To explain the invention based on the embodiment shown in the drawings, 1 is a storage chamber of a grain dryer, and a chevron plate 2 with an inverted V-shaped cross section is provided at the center of the bottom of the storage chamber, and a chevron plate 2 with an inverted V-shaped cross section is provided on the left and right sides of the storage chamber. Install the swash plate 3.3. Both sides of the chevron plate 2 and the guiding swash plate 3.3
A perforated plate 4 is connected to the lower edge of each of the perforated plates 4, and a drying chamber 5.5 is formed by a set of two opposing perforated plates 4.

The discharge port at the lower end of the drying chamber 5.5 is connected to the grain collecting chamber 7 of the equipment through the rotary valve 6, and the #F grain terracens 8 dispensing end, which is horizontally suspended in the groove in the center, is connected to the grain raising machine 9. Connect to the bottom intake of the 10 indicates a loading port communicating with the lower intake port of the y1 grain machine 9.

Next, the upper outlet of the R grain plate 9 is connected to the starting end of the hull helix 11 installed on the upper part of the fuselage, and the terminal end of the hull helix 11 is
It opens in the L direction of the diffusion plate 12 suspended from the center of the ceiling plate of the storage chamber 1.

Then, install the eights 13 and suction fans 14 facing the front and back of the dryer, and move the eights 13 to the left and right drying chambers 14.
．． 5 and look into the hot air chamber 15 inside the fan 1.
4 is connected to the outside of the drying chamber 5.5 and to an exhaust chamber 16 surrounded by the outer wall of the dryer.

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

Then, the grains are put into the loading port 10, passed through the grain hoist 9 and the hull helix 11, and evenly loaded into the storage chamber 1 by the diffusion plate 12.

Next, the rotary/help 6 is rotated, and the grains in the storage chamber 1 are gradually flowed down from the drying chamber 5 to the grain collecting chamber 7. At that time, the hot air from the burner 13 enters the left and right drying chambers 5 from the central hot air chamber 15, strongly drying the surface layer of the grains flowing down, and the exhausted air containing moisture passes through the exhaust chamber 16). Exhaust the air to the outside of the machine through a pipe 14.

The grains that have fallen into the grain collection room 7 are lifted from the grain helix 8 by the Pt machine 9.
The grain then returns to the storage chamber 1 via the hull helix 11, where the moisture in the core of the grain is diffused to the surface layer and refined, and then flows down the drying chamber 5 again.

In this way, the grain transfer device consisting of the rotary valve 6, the grain threshing spiral 8, the +A grain machine 9, the hull spiral 11, and the diffusion plate 12 is driven to circulate the grain and dry it until it reaches a predetermined moisture content. do.

However, in the present invention, the maximum tension foot (full foot) A
Stone (one stone is equivalent to 100 to 110 kg of paddy).

) When drying grains of stone a (a≦A) in a dryer, the burner 13 burns for Td, then stops for Ts, and repeats this periodically (3rd (see figure).

a Ta A Td+Ts (1 formula) and the combustion time Td of the burner (1 formula) is the grain circulation time T (i.e., the time required for the grain at any position inside the machine to circulate once inside the machine) be equal to

When the amount of grain tensioned is a, one circulation time T is T=t Since t is determined by the model of the dryer, (1) the circulation time T varies depending on the model of the dryer even if the actual filling amount a is the same.

However, if the dryer model is the same, t and A are constant, so the repetition period of burner combustion and stop F (Td
+Ts) is constant from equation (1) as Td+Ts= TdX (A/a) =T'X(A/a) =tXaX (A/a)=tXA, and this tXA is constant when the dryer is full It means one cycle time when grain is loaded.

Therefore, in other words, Equation (1) is as follows: In the case of an arbitrary tension la, after burning the heena for the time Td = T for the grain to circulate once in the machine, combustion is opened and stopped for a predetermined time Ts,
This means that the repetition period Td+Ts of combustion and stopping is set equal to 1@cycle time tXA when the maximum amount of grain is loaded into the dryer.

When the combustion of the burner is controlled in this way, the grains are dried by hot air for the time Td=T for one circulation in the machine regardless of the amount of stuffing, so the drying loss rate is always constant.

At that time, even if the burner is stopped, the grain transfer equipment such as the rotary valve 6 continues to operate at all times, so as the amount of filling decreases, the number of circulation increases, but one repetition period Td + T
s, even if the number of circulations is large, the burner burns only during the circulation time, so the drying rate is not affected by the number of circulations.

In order to periodically burn the lζ-su 13 according to the amount of grains loaded, or to stop combustion, a potentiometer linked to the set tire for the amount of grains is used to send an electric signal indicating the amount of grains loaded. This is carried out by reading the program into the CPU'U of the microcomputer and sending an operating signal to the electromagnetic fuel valve and ignition heater provided in the burner 13 in accordance with a predetermined program to periodically operate these.

Note that a timer may be manually set depending on the amount of filling, and thereby the electromagnetic fuel valve, pump, and ignition heater may be operated periodically.

To explain this more specifically with numerical values, for example, in a dryer with the maximum loading amount of Ag2O stones and t = 2 minutes, when paddy with a = A is loaded and dried, the paddy inside the machine goes through one cycle. Since the time Tci for this is Td = T = 2 minutes x 20 = 40 minutes, when this is substituted into equation (1), Ts = O, and the burner 13 - becomes continuous combustion. However, if the same dryer is loaded with paddy equal to the minimum loading amount of 6 koku (a
= 6 stones), Td = T = 2 minutes X 6 = 12 minutes, so equation (1) is 6 12 20 12 + Ts, and solving this gives Ts = 28 minutes. Therefore burner 1
3, the cycle of burning for 12 minutes and stopping for 28 minutes is repeated. Td is Td=
When T=1.5X40=60 minutes, the burner 13 becomes continuous combustion as described above, but when this dryer is loaded with the minimum loading amount of 8 stones (828 stones), T d
= T = 1.5 minutes x 8 = 12 minutes, so Roasted: 12 40. 124Ts, Ts=48 minutes, and the burner 13 repeats a cycle of burning for 12 minutes and stopping for 48 minutes.

In this way, even if the grain tension flea is the minimum and the combustion time Td is the shortest, Td is actually not less than 12 minutes, so even if the burner is stopped periodically, the combustion It can be seen that the conditions do not become unstable, the temperature of the burner and the hot air during combustion are maintained at approximately constant temperatures, and in practice there are no problems such as uneven drying.

In short, the present invention uses a repetition period equal to one circulation time of the grain when the maximum number of grains is loaded into the dryer, and the burner is intermittently operated for one circulation time of the grain actually loaded. a means for transmitting a signal to cause combustion to occur;
The present invention is characterized by comprising a means for combusting or stopping combustion in the burner based on the signal.

Therefore, in the present invention, the burner 13 burns for the time it takes for the actually loaded grain to circulate once inside the machine, and the grain always burns for the time it takes to circulate inside the machine once, regardless of the amount of loaded grain.
Since the grains are dried by the hot air from the burner 13, the grains can be dried at the same ideal drying loss rate regardless of whether the amount of mulch is large or small;
Since there is no need to throttle the fuel, the 8-su 13 can be burned stably, and since the grain transfer equipment such as the rotary valve 6 continues to operate from start to finish, it is sufficient to start it only once in one drying operation. This has the effect of minimizing wear and tear on the aircraft body due to overload conditions that occur during startup.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of a circulating grain dryer embodying the present invention, Fig. 2 is a cross-sectional plan view taken along line II-II, and Fig. 3 shows the repeated cycle of combustion and stop of the burner. It is a graph. Agent Tetsube Maki (and 2 others)

Claims (1)

[Claims] When the maximum amount of grain is loaded into the dryer, a signal is sent that causes the burner to burn intermittently for one circulation time of the grain actually loaded. A combustion control device for a burner in a circulating grain dryer, comprising means for combusting the burner or for stopping the combustion L7 based on the signal.