JPS63148085A - Drying suspension controller in 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] [Industrial Application Field] The present invention relates to a drying pause control device for a grain dryer that can set a so-called drying pause time in which the burner is stopped between the start of drying and the finish. be.

[Prior art and problems to be solved by the invention] In a grain dryer that repeatedly dries grains while continuously flowing them down, in order to eliminate uneven drying during the process or to prevent noise at night, the grain dryer is A method is known in which a pause time is set and sequential drying is performed in the order of first-stage drying, drying pause, and second-stage drying. In this case, should the timing of transition from pre-stage drying to drying pause be determined by the elapse of the set time of pre-stage drying?
No. 151194), or when the moisture value of the grain to be dried reaches a predetermined value (Japanese Patent Application Laid-open No. 24759/1983).

By the way, a configuration in which any of the above forms can be selected is convenient as it allows consideration of drying conditions, etc., and the present invention aims to facilitate this selection setting.

[Means for Solving the Problem] Therefore, the present invention has a structure in which a drying pause is performed by stopping at least the burner 6 during the circulation drying of the circulation type grain dryer, and reheated air drying is performed after a predetermined period of time has elapsed. In the case where the drying pause start time can be set according to the elapse of a set time or automatically set when the moisture value of the grain to be dried reaches a predetermined value, the first stage drying setting switch 3
Reference numeral 2 is a structure of a drying pause control device in a grain dryer which is switchably provided between a hot air drying time setting section (a) and an automatic moisture setting section (a) before the drying pause.

[Operations and Effects of the Invention] When the pre-drying time is set in advance using the pre-drying setting switch and the drying operation is started, the burner and the circulation mechanism are driven to perform hot air drying during the set pre-drying time, thereby increasing the pre-drying time. When the set timer expires and this pre-drying time has elapsed, the burner stops, hot air drying is interrupted, and the drying pause state occurs.

When the drying pause process determined by the set time etc. is completed, the burner and the rear part of the circulator are driven again until the target moisture value is reached, or the process moves to the subsequent drying process set by the timer.

The pre-drying setting switch can set the pre-drying time and also select automatic transition depending on the grain moisture value, so when performing drying work including the so-called pause drying of pre-drying - drying pause - post-drying. This is a switch that must be selected and operated, thereby preventing mistakes such as forgetting to operate it.

[Example code] An embodiment of this invention will be described based on the drawings.

Reference numeral 1 designates a frame of a grain dryer, which has a storage tank 2 at the top, a drying chamber 3 at the middle, and a grain collection chamber 4 at the bottom. An elevator 5 for lifting and returning the collected grains to a storage tank 2 is installed on one side. The drying chamber 3 has a downstream passage 10.10 formed between a hot air chamber 7 that communicates with the burner 6 and an exhaust chamber 9 that communicates with the exhaust fan 8. This is a well-known structure in which the material is dried by blowing hot air onto it.

The elevator 5 has a belt 11 that runs between the upper and lower driving pulleys and driven pulleys, and packets 12, 12, . . . are arranged on the belt 11 at regular intervals. These packets 12, 12... scoop up the grains transferred to one side by the transfer spiral 13 installed horizontally at the lower part of the grain collection chamber 4, convey them upward, and reach the transfer end of the forward stroke. It has a configuration in which it springs out from the throwing spout part 14. Reference numeral 15 indicates an upper transfer spiral that receives the splashed grains and horizontally transfers them; 16 indicates a diffusion plate disposed at the center of the upper part of the storage tank 2 to rotate around a vertical axis; and 17.17 indicates a flow passage 10. This is a delivery valve provided at the bottom of 10. Further, 18 is a tensioning hopper connected to the lower part of the elevator 5.

The motors that drive each part of the dryer include a motor 19 for driving the packet belt 11 of the elevator 5 and a motor for driving the vertical transfer spiral 13.1.
5. Drive motor 20 that drives the delivery valve 17, 17, etc.
A grain circulation system motor consisting of a motor 21 for an exhaust fan 8
, a motor 23 for the dust ejector 22, etc., each of which is controlled to rotate and stop based on control signals from a microcomputer, which will be described later.

A control box 24 is provided on the front of the machine frame, and the operation panel surface is provided with push button switches 25, 26, 27, and 28 for loading, drying, discharging, and stopping, as well as a grain type setting switch 29 and a target moisture setting switch. 30, tension amount setting switch 31, and timer switch 32, 33.3
4th class is installed. 35 is a digital display unit capable of displaying 4-digit numbers using 7-segment LEDs, and alternately displays hot air temperature, moisture value, remaining time, etc. Of these, the timer switches 32 and 33 are set by rotary switches, and allow the timer function built in the arithmetic and control section described later to perform time-limited processing.
Since it can be arbitrarily set in units of time, the pre-drying time A can be set. Similarly, the switch 33 can set the drying pause time B from 0 to 8 hours in units of 2 hours. The timer switch 34 is in the form of an increase/decrease button switch, and is configured so that the set time for each push operation is displayed on the digital display section 28 in units of, for example, 30 minutes, and the time limit operation is controlled by calculations described later, similar to the switches 32 and 33. It is possible to set the subsequent drying time C.

In addition, the switch 32 can be set to rotate the time setting range A arbitrarily, and can also be set to a position exceeding the maximum setting time (in the example shown, the "2nd stage" position). It is also used as a changeover switch as a setting mechanism for switching to a drying pause when the amount of grains reaches a predetermined set value, for example 20%.

The above-mentioned second-stage drying time setting timer switch 34 has a maximum of 30
It can also be used as a total hot air drying time setting timer when there is no pause (normal drying).

36 is a push button type reservation switch for setting drying using the timers 32, 33, etc. mentioned above.

Reference numeral 37 is a display section for displaying abnormalities, etc., and is configured to display "anomaly in paddy flow", "misfire", etc. by lighting LEDs 38, 38, etc. using arrows along with illustrations of the dryer main body. The abnormality can be detected by installing abnormality sensors 39, 39, . . . .

Figure 5 shows a block circuit diagram, in which the arithmetic control unit (CPU)
Drying control is performed by a microcomputer constituted by 40, memory 41, and the like.

That is, this arithmetic control unit 40 receives setting signals for each switch arranged on the operation panel surface of the control box 24, nine signals from the abnormality sensors 39, 39, . . . , or the hot air temperature sensor 42 and the outside air temperature sensor. Each output signal from 43, outside air temperature sensor 44, grain temperature sensor 45, and moisture meter 46 is input. On the other hand, signals for the burner 6 drive system of the ignition heater 47, fuel pump 48, and fuel valve 49, signals for driving and controlling the circulation system loads of the drive motor 2o such as the elevator motor 19 and the delivery valve, control signals for driving the exhaust fan motor 21, etc. is output. 5o is an A/D converter, 51
．． 51 is a turnout interface.

The calculation control unit 40 outputs a drive start signal to the burner drive load and the circulation system load by turning on the reservation switch 36 and the drying switch 26 based on the set time A of the pre-drying setting switch 32 in the form of a rotary switch. At the same time, a time-limited operation is started, and a stop signal is outputted to control these operations to stop when the set time has elapsed. Further, as the pre-drying time A elapses, the drying pause time setting timer 33 starts a time-limiting operation, and at the same time, the set pause time B is started.
Then, a drying pause control signal is output to cut off the drive output to the burner drive system and circulation system load -'/-.

When the drying pause time B has elapsed, a time-limited operation based on the set time of the subsequent drying time setting timer switch 34 is started, and a drive signal is output to the load of the burner drive system and circulation system. It should be noted that the drying end signal is output when the second stage drying time C based on the timer setting has elapsed.

Further, when the setting position of the pre-drying setting switch 32 is at the mouth, when the moisture data from the moisture meter 46 reaches a predetermined value stored in the memory in advance, for example 20%, the pre-drying is ended and the drying pause process is started. The first stage drying control output and subsequent drying control signals are output as necessary.

The action of the upper side will be explained.

First, the loading switch 25 is turned ON and a predetermined amount of grain is loaded into the storage tank 2 from the loading hopper 18 using the elevator 5. Next, by setting the type of grain and the amount of grain to be loaded using the switches 29 and 31, the hot air temperature is calculated from the detection results of outside air temperature, outside air humidity, etc., and the drying operation is started by pressing the drying switch 26. If a drying pause is to be performed in the middle, the first drying time A, the drying pause time B, and the second drying time C are set using the first drying setting switch 32, the drying pause setting timer switch 33, and the second drying setting timer switch 34, respectively. Then, turn on the reservation switch 36.

In this way, the burner drive system and circulation system loads are driven and drying is started, and the grains in the storage tank 2 are exposed to hot air while flowing down the drying chamber 3 and reach the grain collection chamber 4. The packet 1 of the elevator 5 is transferred to one side by the lower transfer spiral 13.
2. At 12..., the grain is fried and returned to the storage tank 2, where it is subjected to a tempering action for a while.

After repeating such a process and the pre-drying time A has elapsed, the burner 6 and the circulation mechanism section are stopped and the drying pause begins, during which the grains are subjected to a long tempering action over a resting time B and are made into a homogeneous state. Next, when this drying pause time B has elapsed, the burner 6 and the circulation mechanism section are driven again to enter the second stage drying,
Drying ends when the latter stage drying time C elapses (
(solid line in Figure 6).

By the way, in the above drying process, the pre-stage drying is in the time setting range A of the pre-stage drying setting switch 32, and when this switch 32 is switched to the setting position, the pre-stage drying is not based on time control but becomes moisture value control. . That is, for example 1
When the average moisture value of the moisture meter 46, which can measure the average moisture value of a predetermined grain while sampling each grain, reaches a preset moisture value (20%), the drying pause starts regardless of the elapsed time. It is something to do. The operation after the drying pause step is the same as above (phantom line in FIG. 6).

Incidentally, in the above cases, the case where the drying is completed by setting a timer and the output of the moisture meter 46 is not taken into account has been explained. The drying may be terminated when the target moisture value is reached.

In the above-mentioned embodiment, drying including a pause of pre-drying, drying pause, and post-drying is started after the reservation switch 36 is turned on, and the reserved drying is performed in the middle of normal drying that does not involve a drying pause. It is also possible to switch to the form. That is, during normal drying, the pre-drying setting switch 32, the drying pause time setting timer switch 33, etc. may be input, and from the time when the reservation switch 36 is turned on, the process may proceed to so-called scheduled drying.

In addition, in the above embodiment, the setting position opening was set at a single location, but
Different moisture values may be settable so that this can be set at multiple locations.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is an overall front view, Fig. 2 is a side view thereof, Fig. 3 is a front sectional view, and Fig. 4 is a front view showing the operation panel of the control box. , FIG. 5 is a block circuit diagram, and FIG. 6 is an explanatory diagram of the operation. In the figure, 2 is a storage tank, 3 is a drying room, 4 is a grain collecting room, 5 is an elevator, 6 is a burner, 24 is a control box, 2
6 is a drying switch, 32 is a front stage drying setting switch, 33
34 is a drying pause time setting timer switch, 34 is a subsequent drying time setting timer switch, 36 is a reservation switch, 40 is an arithmetic control unit, and 4-11=6 is a moisture meter.

Claims (1)

[Claims] During the circulation drying of the circulation type grain dryer, at least burner 6
The structure is such that a drying pause is performed to stop the drying process, and re-hot air drying is performed after a predetermined period of time has elapsed, and the drying pause start time is set according to the elapse of a preset time, or automatically set when the moisture value of the grain to be dried reaches a predetermined value. In the preferred option, the pre-drying setting switch 32 is a drying pause control device for a grain dryer, which is provided so as to be freely switchable between a hot air drying time setting section (a) and an automatic moisture setting section (b) before the drying pause. .