JPH0789026B2 - Drying time setting device in grain dryer - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a drying time setting device in a grain dryer capable of setting a so-called drying pause time in which a burner is stopped between the start of drying and finishing. is there.

[Problems to be Solved by the Prior Art and Invention] In a grain dryer that repeatedly dries grains while continuously flowing them down, in order to eliminate uneven drying on the way or to prevent noise at night, A method of providing a pause time is known (for example, Japanese Utility Model Publication No. 61-151194). In this case, generally, a timer switch for setting the pre-drying time, the drying rest time, and the post-drying time before starting the drying operation is provided. On the other hand, if such a so-called reserved drying is not set and the normal drying mode in which the hot air drying is continuously performed from the start to the end of the drying from the start to the end can be selected, a plurality of timer switches must be configured. It must be complicated.

[Means for Solving the Problem] In view of the above, the present invention aims to simplify the timer setting, and in the circulation type grain dryer, the burner 6 for generating hot air is used.
In addition, normal drying in which hot air drying is performed for a timer set time while driving the circulation mechanism unit and reserved drying in which at least a burner 6 is stopped in the middle of drying to perform a drying pause can be appropriately selected. The reheat air drying time setting timer switch after drying pause is also used as the drying time setting timer switch in the above normal drying, and it is determined whether the time setting of these combined timer switches is the reheat air drying time setting or the normal drying time setting. Therefore, the drying time setting device in the grain dryer is provided with the reservation switch 36.

[Operation and Effect of the Invention] When performing reserved drying, the pre-drying time, the drying pause time, and the post-drying time are set in advance by the timer switches, and the drying operation is started. During the first-stage drying time, the burner and circulation mechanism are driven to perform hot air drying, and the time-delay operation proceeds according to the setting of the first-stage drying time setting timer switch. It becomes a state. The timer mechanism section by the drying pause time setting timer switch setting starts after the elapse of the preceding drying time, and the timer mechanism starts in the same way, and when this setting time elapses, the succeeding drying time setting timer is linked to start the timing operation and the burner and circulation mechanism restart. The unit is brought into a driving state and the drying is completed after a lapse of an appropriate time. On the other hand, when the normal drying is performed instead of the reserved drying, the total drying time is set by the latter-stage drying time setting timer switch before starting the drying.

In this way, the latter-stage drying time setting timer switch for reserved drying and the drying time setting timer switch for normal drying can be used in common, so that the structure of the time-delaying operation part of the timer control mechanism can be simplified.

In addition, the reserved switch 36 is used to determine whether the time setting of the dual-purpose timer switch is the reheat air drying time setting or the normal drying time setting.
Therefore, the necessity of setting input from another timer mechanism for setting and inputting the drying pause time etc. depends on the presence / absence of input of the reservation switch 36. The operation is easy without requiring "0" time setting.

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

Reference numeral 1 is a machine frame of a grain dryer, which is formed by stacking an upper storage tank 2, an intermediate drying chamber 3 and a lower grain collecting chamber 4 in an overlapping manner. An elevator 5 is installed upright to lift and return the collected grains to the storage tank 2 on one side. In addition, drying room 3
Has a downflow passage 10,10 formed between a hot air chamber 7 leading to the burner 6 and an exhaust air chamber 9 leading to an exhaust fan 8, and the hot air is blown onto the grain when passing through the downflow passage 10,10. This is a known structure for drying.

Inside the elevator 5, there is a belt 11 which is wound around upper and lower drive pulleys and driven pulleys, and buckets 12, 12, ... Are arranged on the belt 11 at regular intervals. This bucket 12,
12 ... scoops up the grains transferred to one side by a transfer spiral 13 provided laterally in the lower part of the grain collection chamber 4 and conveys them upward.
The structure is such that the transfer end portion of the forward stroke is projected to the throwing port portion 14. Reference numeral 15 is an upper transfer spiral that horizontally receives and receives the splashed grains, 16 is a diffuser disposed in the center of the upper portion of the storage tank 2 so as to rotate around the vertical axis, and 17, 17 are flow-down passages 10, It is a delivery valve provided at the bottom of 10. Reference numeral 18 is a tension hopper connected to the lower part of the elevator 5.

A motor for driving each part of the dryer is a grain circulation system motor including an engine 19 for driving the bucket belt 11 of the elevator 5 and a drive motor 20 for driving the vertical transfer spirals 13, 15 and the feeding valves 17, 17 and the like, and an exhaust fan. It is composed of a motor 21 for 8 and a motor 23 for dust collector 22 and the like, and each is controlled to rotate / stop based on a control signal of a microcomputer described later.

A control box 24 is provided on the front of the machine frame, and push-button switches 25, 26, 27, 28 for loading, drying, discharging, and stopping are provided on the operation panel surface, as well as a grain type setting switch 2
9, target moisture setting switch 30, overhang amount setting switch 31,
Also, timer switches 32, 33, 34 are provided. Reference numeral 35 is a digital display unit capable of displaying a 4-digit number by a 7-segment LED, and displays hot air temperature, water content, remaining time, etc. in turn. Of these, the timer switches 32 and 33 are set by rotary switches and are time-limited by the timer function built into the arithmetic control unit, which will be described later, and 32 can arbitrarily set 0 to 9 hours in 3 hour units. The pre-drying time A can be set. Similarly, timer switch 33
Can set the dry rest time B in units of 2 hours from 0 to 8 hours. The timer switch 34 has a configuration in which the set time by each push operation is displayed on the digital display unit 28, for example, in units of one hour in the form of an increase / decrease button switch, and the time-delayed operation is the same as that of the timer switches 32 and 33. It is processed in the control unit, and the post-drying time C can be set.

Also, the latter-stage drying time setting timer switch 34 is
It can be set to 30 hours and can also function as a timer switch for setting the total hot air drying time when there is no pause (normal drying).

Reference numeral 36 is a push button type reservation switch for setting the drying by the timer switches 32, 33 and the like. This switch
It can be set to reserved drying by pushing operation of 36, and can be set to normal drying when not operating.

37 is a display section for displaying abnormalities, etc. LE is used to indicate "paddy flow abnormality", "misfire" etc. by using the arrow with the illustration of the dryer main body.
It has a structure that can be displayed by lighting D38, 38 ... And is provided so that it can be detected by installing abnormality sensors 39, 39.

FIG. 5 is a block circuit diagram showing the arithmetic control unit (CPU) 4
A drying control is performed by a microcomputer configured of 0, a memory 41 and the like. That is, in the arithmetic control unit 40, the setting signals of the switches arranged on the operation panel surface of the control box 24, the signals from the abnormality sensors 39, 39, or the hot air temperature sensor 42 / outside air temperature sensor 43.
-Each output signal from the outside air humidity sensor 44, grain temperature sensor 45, and moisture meter 46 is input. On the other hand, a signal for driving the burner 6 of the ignition heater 47, the fuel pump 48, the fuel valve 49, a signal for driving and controlling the circulation system load of the drive motor 20 for the elevator motor 19, the feeding valve, a control signal for driving the exhaust fan motor 21, etc. Is output. Reference numeral 50 is an A / D converter, and 51 and 51 are input / output interfaces.

The arithmetic control unit 40 sends 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 preceding stage drying time setting timer switch 32 in the form of a rotary switch. At the same time as outputting, the time-delay operation is started, and a stop signal is output to stop and control these when a set time has elapsed. Further, when the preceding-stage drying time A has elapsed, the timer time-setting operation by the setting of the drying pause time setting timer switch 33 is started, and at the same time, the drive output to the burner drive system and the circulation system section is cut off for the set pause time B. Therefore, the drying pause control signal is continuously output. When the drying pause time B elapses, the time delay operation of the timer by the setting 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 the circulation system. It should be noted that the drying end signal is output when the post-drying time C has elapsed due to the setting of this timer switch.

The front-stage drying time setting timer switch 32 and the drying pause time setting timer switch 33 are provided so that the settings can be changed even after the start of drying. The contents of each setting change are read, the time that has already elapsed is cleared, and the newly set time A It is configured such that the timed operation can be started on the basis of'to B '.

The operation of the above example will be described.

First, turn on the stake-in switch 25, and from the stake-in hopper 18 to the elevator 5
A predetermined amount of grain is put into the storage tank 2 by using. Next, if the grain type and the amount of swelling are set by the switches 29 and 31, the hot air temperature is calculated from the detection results of the outside air temperature and outside air humidity, and the drying switch 26 is pressed to start the drying operation. When setting the so-called reserved drying, in which the drying pause is performed during the drying process, the front stage drying time A and the drying pause time B are set by the front stage drying time setting timer switch 32, the drying pause setting timer switch 33, and the rear stage drying setting timer switch 34. The post-drying time C is set respectively, and the reservation switch 36 is turned on.

In this way, the burner drive system and the circulation system load are driven to start the drying, and the grains in the storage tank 2 are exposed to hot air while flowing down the drying chamber 3 and reach the grain collecting chamber 4. The lower transfer spiral 13 transfers the buckets 12 and 1 of the elevator 5 to one side.
It is fried in 2 and reaches the storage tank 2 again, where it is tempered for a while.

When such a process is repeated and the preceding-stage drying time A has elapsed, the burner 6 and the circulation mechanism section are stopped and the drying pause is entered, and the grain is brought into a homogeneous state by a long-term tempering operation for a pause time B. Next, when the drying pause time B elapses, the burner 6 and the circulation mechanism section are driven again to start the second-stage drying, and when the second-stage drying time C elapses, the drying is completed (solid line in FIG. 6).

During the above-mentioned drying process, for example, if the pre-drying time is changed to A'during the pre-drying, the time limit until then is cleared and the hot air drying is continued with the new drying time A'as the pre-drying time. For example, if the change time A'is set to 0, the pre-stage drying is stopped and the drying pause is immediately started. Similarly, if the drying pause time is changed to B'during the drying pause, the drying pause is continued from that point until B'passes.
When is set to 0, the second stage drying starts immediately.

Thus, even during the drying process, it is possible to change the setting of the previous-stage drying time and the drying pause time, so that an appropriate drying finish time can be obtained while monitoring the drying state.

On the other hand, in the case of so-called normal drying in which hot air drying is performed from the start of drying to the end of drying, if the increase / decrease push button of the latter-stage drying time setting timer switch 34 is appropriately set and the drying switch 26 is pressed as it is. Immediately, the burner 6 and the circulation system are activated to start hot air drying (dotted line in FIG. 6).

In the above case, the description has been given of the case where the drying is completed by the timer setting and the output of the moisture meter 46 is not considered in both the reserved drying and the normal drying, but the moisture meter 46 is installed in the grain circulation unit, It is also possible to set a target moisture value in advance, detect the moisture value at predetermined time intervals, and finish the drying when the target moisture value is reached.

Even in the mode in which the target moisture value is set and the drying is completed, the time setting by the post-drying time setting timer switch 34 must be neglected for both the reserved drying and the normal drying for safety against the abnormality of the moisture meter. In both normal drying and reserved drying, each drying operation status is estimated and the safe range that does not cause overdrying is predicted and the time is set. In addition, when an arbitrary time is not set, for example, 30 hours is automatically set for normal drying, and 15 hours is automatically set for reserved drying. In the case of reserved drying, if the post-drying time is set too long, excessive drying is likely to occur, so if it is arbitrarily set above the specified value (for example, 15 hours), it will be replaced with the set value for safety. A timer is even safer.

The reserved drying of the first-stage drying-drying pause-the second-stage drying in the above embodiment is to start the control by turning on the reservation switch 36, and in the middle of the normal drying without the drying pause, the reserved drying mode is set. It is also possible to switch. That is, in the middle of normal drying, the previous stage drying time setting timer switch
32, the drying pause time setting timer switch 33 or the like may be input, and the reservation drying may be started from the time when the reservation switch 36 is turned on.

[Brief description of drawings]

1 shows an embodiment of the present invention. 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 an operation panel of a control box. 5, FIG. 5 is a block circuit diagram, and FIG. 6 is an explanatory diagram showing the operation. In the figure, 2 is a storage tank, 3 is a drying chamber, 4 is a grain collecting chamber, 5 is a lift, 6 is a burner, 8 is an exhaust fan, 13 is a lower transfer spiral, 15 is an upper transfer spiral, 19, 20, 21, 23 is a motor, 24 is a control box, 26 is a drying switch, 32 is a front-stage drying time setting timer switch, 33 is a drying pause time setting timer switch, 34 is a rear-stage drying (normal drying) time setting timer switch, and 35 is a digital display section. , 36 is a reservation switch, 40 is an arithmetic control unit, 47 is an ignition heater, 48 is a fuel pump, and 49 is a fuel valve.

Claims (1)

[Claims] 1. In a circulating grain dryer, normal drying is performed in which hot-air generating burner 6 and a circulation mechanism portion are driven while hot-air drying is performed for a timer set time, and drying pause is performed in which at least burner 6 is stopped during drying. Reserved drying for performing the above-mentioned drying can be appropriately selected, and the reheat air drying time setting timer switch after the drying pause in the reserved drying also serves as the drying time setting timer switch in the normal drying A drying time setting device in a grain dryer, which is provided with a reservation switch 36 for determining whether the time setting is set to the reheat air drying time setting or the normal drying time setting.