JPH0643063B2 - Microwave dryer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a microwave dryer.

(B) Prior Art In the microwave drying device disclosed in Japanese Utility Model Laid-Open No. 59-91592, an object to be dried is supplied to a drying chamber, the supplied object to be dried is microwaved, and then dried. Drying of the material to be dried is performed based on a series of operations of discharging the material to be dried from the chamber.

Thus, in such an apparatus, if a series of operations relating to supply, drying, and discharging of the material to be dried is repeatedly and automatically performed, it is convenient to continuously dry the material to be dried. In this case, the series of operations that are being repeated at the desired arbitrary point of time can be ended to complete the continuous drying of the material to be dried, and then the series of operations relating to another kind of material to be dried can be smoothly transferred. It is even more convenient.

(C) Problems to be Solved by the Invention The present invention is directed to continuous drying of a material to be dried by repeating a series of operations relating to supply, drying and discharge of the material to be dried, at a desired arbitrary time, and the above series of It is intended to end the operation and smoothly shift to a series of operations relating to another type of material to be dried, and to shorten the time required for this movement as much as possible.

(D) Means for Solving the Problems The microwave drying device of the present invention has, as a first configuration, a drying chamber, a supply device for supplying an object to be dried to the drying chamber, and the object to be dried by microwave. Therefore, a series of microwave supply means for supplying microwaves to the drying chamber, a discharge device for discharging the microwave-dried object to be dried from the drying chamber, the supply device, the microwave supply means, and the discharge device. In addition to the basic configuration including a repetitive execution means for automatically and repeatedly executing drive control, a number of times setting means for setting the number of times of the above series of drive controls, and a series of drive controls of the number of times set by the number of times setting means When the above is executed, a stop means for stopping such a series of drive control is provided.

Further, as a second configuration, in addition to the basic configuration, an end time setting means for setting an end time of the series of drive controls, and the setting end when the series of drive controls are repeated an arbitrary number of times. When the remaining time up to the time is at least shorter than the time required for the microwave drying, a stop unit for stopping the series of drive controls is provided.

(E) Action In the first configuration, under the setting of the number of times of the series of drive controls relating to the supply, drying, and discharge of the material to be dried, at the time when the series of drive controls is executed by the number of times. The above series of drive controls are stopped, and from this point in time, it is possible to smoothly shift to the series of drive controls for another type of material to be dried.

Further, in the second configuration, based on the setting of the end time of the series of drive controls, the remaining time until the set end time is required at least in the microwave drying at the time when the series of drive controls is repeated an arbitrary number of times. If the time is shorter than the time, the series of drive controls is stopped, and from this point, it is possible to smoothly shift to the series of drive controls for another type of material to be dried in a short time.

(F) Embodiment FIG. 1 shows the structure of a microwave drying apparatus according to an embodiment of the present invention. The apparatus comprises a drying apparatus main body (1) and its peripheral mechanism.

The drying apparatus main body (1) is provided with a cylindrical drying chamber (3) having an openable and closable upper lid (2) as a main part.
A supply pipe (4) is connected to the upper left portion of the drying chamber, and the tip of the supply pipe reaches a storage tank (6) for storing the granular or powdery material to be dried (5). Examples of the material to be dried (5) include resin pellets, rice, and chemical powders. The resin pellets are molded after being melted, but if the resin pellets are dried prior to such melt molding, the subsequent molding will be performed well. In this embodiment, resin pellets are selected as the material to be dried (5). A suction hopper (7) is connected to the center of the upper lid (2) of the drying chamber (3). A filter wire mesh (8a) having a mesh smaller than the material diameter of the material to be dried (5) and a filter paper (8) are arranged in the hopper, and the poppet valve (9) is located above the filter paper. Is provided. A suction blower (11) is connected to the suction hopper (7) via an intake pipe (10) above the poppet valve (9).
In this case, when the blower (11) is driven while the poppet valve (9) is driven to be opened, the intake action of the blower (11) causes the intake pipe (10), the suction hopper (7) and the drying chamber (3). )
The material to be dried (5) in the storage tank (6) reaches the drying chamber (3) through the supply pipe (4). When the material to be dried (5) reaches the drying chamber (3), it falls by its own weight and accumulates therein. Here, the above-mentioned supply pipe (4), suction hopper (7), and intake pipe (1
0), the blower (11) puts the material to be dried (5) in the drying chamber (3).
It forms a supply device for supplying to.

In the drying chamber (3), microwaves are supplied from the magnetron (12), which is a microwave supplying means, through the waveguide (13), and the bottom wall is driven by the motor (14). A stirrer (15) for stirring the material to be dried (5) is provided. A level sensor (16) and a temperature sensor (17) such as a thermistor are arranged on the side wall of the drying chamber (3). Such a level sensor (16) is provided with an object to be dried (5) in the drying chamber (3).
The temperature sensor (17) detects the temperature of the material to be dried (5). In addition, a compressor (19) is installed at the left bottom of the drying chamber (3) via an intake valve (18).
Is connected to the upper lid (2) of the drying chamber (3) and the exhaust valve (2
0) is provided. The driving of the compressor (19) and the opening of the intake valve (18) and the exhaust valve (20) are performed when the material to be dried (5) is dried by microwaves, and the steam generated during the drying is compressed. It is discharged to the outside through the exhaust valve (20) together with the air from (19). Further, a piston discharge valve forming a discharge device is provided at the right bottom of the drying chamber (3).
(21) is provided. The discharge valve is driven to open when discharging the dried object (5), and at this time, the dried object (5) is discharged through the discharge pipe (22). ) Then falls and collects in the lower reserve chamber (23).

In this way, in the preliminary room (23) where the material to be dried (5) accumulates,
A heat insulation heater (24) is arranged on the lower inclined wall,
A level sensor (26) having a rotating body (25) is provided in the preliminary chamber (23). Such a level sensor (26) normally rotates the rotating body (25), and a small predetermined amount of the material to be dried (5) is accumulated in the preliminary chamber (23) to rotate the rotating body (25). However, when the object to be dried (5) becomes a load and the rotating body (25) cannot be rotated satisfactorily, a predetermined signal is output and the object to be dried (5) accumulates in a slight predetermined amount. Detect that there is.

The lower portion of the spare chamber (23) is connected to another suction hopper (27) located higher than the spare chamber (23) through a transfer pipe (28). Similar to the suction hopper (7), the suction hopper (27) has a filter wire mesh (29a) and a filter paper (29) having a mesh smaller than the material diameter of the material to be dried (5).
And a poppet valve (30) is provided above the filter paper. And such poppet valve (3
In the upper part of (0), the suction pipe is also connected to the suction hopper (27).
The suction blower (11) is connected via the (31). In this case, with the poppet valve (30) open, the blower (11)
When you drive the blower (11), the intake action of the blower (11)
(31), through the suction hopper (27) to the transfer pipe (28), the material to be dried (5) accumulated in the preliminary chamber (23) passes through the transfer pipe (28) and the suction hopper (27) Leading to. When the material to be dried (5) reaches the suction hopper (27), it falls into the hopper by its own weight. In the suction hopper (27), the heat retaining heater (32) is arranged on the lower inclined wall, the opening / closing valve (33) is provided on the lower end, and the upper and lower limit level sensors (34) (34) 35) is located. Open / close valve (3
In the closing of 3), the suction action works, and when the material to be dried (5) falls in the suction hopper (27), the suction hopper (27)
When the material to be dried (5) accumulates in the inside and the opening / closing valve (33) is opened, the material to be dried (5) thus accumulated falls downward and reaches the next stage processing unit. The material to be dried (5), that is, the resin pellets dried in step (1) is melt-molded.

FIG. 2 shows a circuit of the above microwave dryer, and as a main control unit, product number LC-65PG23 manufactured by Sanyo Electric Co., Ltd.
Is provided with a microcomputer (36) for operating the operation information from the operation section (37) provided on the front surface of the drying apparatus main body (1) and the temperature information from the temperature sensor (17). , Based on the information from the various level sensors (16) (26) (34) (35), etc., the magnetron (12), motor (14), intake valve (18), exhaust valve (20), compressor (19),
The discharge valve (21), the heater (24) (32), the suction blower (11), the poppet valve (9) (30), and the opening / closing valve (33) are drive-controlled and on the front surface of the dryer main body (1). The time display section (38), the light emitting diode (39), and the puzzer (40) provided are driven and controlled.

FIG. 3 shows a flow chart of an operation program incorporated in the microcomputer 36, and the operation of the microwave dryer will be described below with reference to the chart.

First, when the power is turned on, the microcomputer (3
In 6), the initial setting operation is performed and it is in a state of waiting for operation information from the operation unit (37). In the above-mentioned initial setting operation, all the writable areas in the microcomputer (36) are cleared, and the magnetron (12),
Motor (14), Compressor (19), Heat insulation heater (24) (32),
Suction blower (11), time display (38), light emitting diode (3
9), the buzzer (40) is placed in a drive stopped state, and the intake valve (18), exhaust valve (20), discharge valve (21), poppet valve (9) (3)
0) and the on-off valve (33) are closed. Further, in the state of waiting for the above operation information, the setting of the current time information is first waited. Therefore, when the current time information is set by the key operation on the operation section (37), such information is input, and thereafter the computer (36) In (), the current time is updated based on the time information.

Thus, when the material to be dried (5), which is a resin pellet, is melt-molded, if the material to be dried (5) is previously dried so that such molding can be performed well, then the operation unit (37) At
Within the range of 20 to 60 minutes and the range of 70 to 170 ° C., desired drying time and drying temperature are set by key operation, and the continuous switch (41) is turned on. Then, the operation information is input, and the steps S1 to S9 are cyclically executed. S1 current time T _1, which is sequentially updated in step is displayed on the time display unit (38), in the step S2 is examined whether the set number reservation flag in the computer (36) (now Mu set), S3 In the step, it is checked whether or not the time reservation flag in the computer (36) is set (no setting is set now), and in the step S4, the computer (3
It is determined whether or not the reservation number counter n in 6) is set to 1 or more (currently 0 is set). S
In step 5, it is determined whether the reserved time T is set and the reserved time T is after the current time T ₁ . In this case, since the reservation time T has not been set, step S6 is executed next. In step S6, it is checked whether or not the reservation correction key on the operation unit (37) has been operated (no operation at present). In step S7, the carrying operation is performed as needed. This is not necessary at this time, and the carrying operation is not performed. Therefore, the details of such operation will be described later. S
In step 8 it is checked whether or not the start flag in the computer (36) is set (currently not set), and in step S9 it is checked whether or not the start key on the operation unit (37) is operated (no operation now). .

After that, when the start key is operated on the operation unit (37), the cyclic execution of the above steps S1 to S9 ends at step S9 and each step of steps S10 to S17 is executed. In step S10, the light emitting diode (39) and the buzzer (40) are stopped when they are lit and ringing. In step S11, the start flag is set, and in step S12, drive control of the heat retaining heaters (24) and (32) is started. That is, each of the heat retaining heaters (24) and (32) is intermittently driven at a desired ratio so that the insides of the preliminary chamber (23) and the suction hopper (27) are approximately maintained at the set drying temperature. The inside of (23) and the suction hopper (27) is kept at the above temperature. In step S13, it is determined whether or not the transport operation is currently performed (not currently performed). In step S14, the operation of supplying the material to be dried (5) to the drying chamber (3) is executed. That is, the poppet valve (9) is opened, the suction blower (11) is driven, and the material to be dried (5) is supplied from the storage tank (6) into the drying chamber (3) by using the suction operation of the blower (11). Further, the motor (14) is driven to rotate the stirring body (15), and the upper surface of the material to be dried (5) supplied into the drying chamber (3) is aligned with a smooth horizontal surface. In step S15, it is checked whether or not the counter start flag in the computer (36) is set (currently not set), in step S16, the elapsed time counter t in the computer (36) starts counting operation, and in step S17, the above counter is set. The start flag is set.

After that, the steps S1 to S8, S18, and S13 to S15 are cyclically executed. At this time, in step S18, whether the upper surface of the material to be dried (5) reaches the position of this sensor (16) by the detection of the level sensor (16) and the material to be dried (5) is accumulated in the drying chamber (3) by a predetermined amount. It is determined whether or not (in this case, it is determined that the predetermined amount is not accumulated). Once it is determined that a predetermined amount has been accumulated, this determination is continuously held until the material (5) to be dried thus accumulated is discharged thereafter.

Then, a predetermined amount of the material to be dried (5) is accumulated in the drying chamber (3),
If this is determined in step S18, then step S19,
The steps S20 and S21 are sequentially executed. S19
In step S14, the operation of supplying the material to be dried (5) to the drying chamber (3) executed in step S14 is completed, and
In the step, a drying operation (described later) is executed and it is judged whether or not the drying elapsed time has reached the set drying time (in this case, the drying operation has not been executed,
The decision is made). In addition, once the arrival judgment is made,
Such judgment is continuously held until the material to be dried (5) currently stored in the drying chamber (3) is discharged thereafter.
In step S21, the drying operation is executed. That is, it is determined whether the temperature of the material to be dried (5) detected by the temperature sensor (17) reaches the set drying temperature or not.
(12) is intermittently driven, the material to be dried (5) is maintained at the drying temperature for microwave drying, and the motor (14) is re-driven to rotate the agitator (15) to rotate the material to be dried ( 5) is stirred so that it can be evenly dried, and the compressor (19)
And the intake valve (18) and the exhaust valve (20) are opened, so that the water vapor generated from the material to be dried (5) is discharged to the outside. Further, in step S21, along with such a drying operation, measurement of the elapsed dry time is started.

Thus, the steps S1 to S8 and S18 to S21 are cyclically executed, and after that, when the drying elapsed time reaches the set drying time, the cyclic execution of steps S1 to S8 and S18 to S21 ends at step S20, and then S22. Each step of to S25 is sequentially executed. S2 in step S22
The time of the drying operation and the elapsed time of drying executed in one step is ended and the time counted is reset. In step S23, the discharging operation (described later) is executed and the discharging elapsed time is predetermined discharging time (this is to discharge all the predetermined amount of the material to be dried (5) accumulated in the drying chamber (3)). (Enough time to do so) is reached. In this case, the discharging operation has not been executed, and a determination is made. In step S24, it is determined whether or not a predetermined amount of the material to be dried (5) has already accumulated in the preliminary chamber (23) based on the detection of the level sensor (26) (in this case, a determination is made). ). Incidentally, when an affirmative judgment is made, such judgment is continuously held until the material to be dried (5) currently accumulated in the drying chamber (3) is discharged.
In step S25, when the main operation (described later) in the drying chamber (3) is being performed, this operation is ended. And S2
In the 5th step, the discharging operation of discharging the dried material (5) from the drying chamber (3) to the preliminary chamber (23) is executed. That is, the discharge valve (21) is opened, the motor (14) is continuously driven to rotate the stirring body (15), and the stirring body (15) is rotated in accordance with the rotation of the stirring body (15). 15) The material to be dried (5) in the vicinity is pushed to the surroundings, and the material to be dried (5) is discharged to the discharge valve (2
It is dropped and discharged from 1) through the discharge pipe (22) into the preliminary chamber (23). The material to be dried (5) discharged in this way is stored in the preliminary chamber.
By keeping the temperature of (23) from the step S12, it is possible to prevent the dried object (5) from absorbing moisture again due to the natural cooling without performing the natural cooling. or,
In the above step S25, the time counting of the elapsed time of such discharge is started.

Then, the steps S1 to S8, S18 to S20, and S22 to S25 are cyclically executed. During this period, a slight predetermined amount of the material to be dried (5) is stored in the preliminary chamber (23) due to the discharge.
Is accumulated, as long as the material to be dried (5) is accumulated in this way, the above-mentioned preliminary chamber which is kept warm in step S7
A carrying operation is carried out for carrying the dried material (5) from (23) to the suction hopper (27). That is, the poppet valve (30) is opened to drive the suction blower (11), and the suction action of the blower (11) causes the suction hopper (27) to move from the auxiliary chamber (23).
The material to be dried (5) is conveyed to. However, as a result of such conveyance, the suction hopper is detected by the detection of the upper limit level sensor (34).
When the material to be dried (5) accumulates at the position of such sensor in (27),
The carrying operation is automatically terminated. Then, the object to be dried (5) conveyed in this way is transferred to the suction hopper (27) by the above S.
By keeping the temperature from 12 steps, it is possible to prevent the material to be dried from absorbing moisture again without being naturally cooled. Therefore, the above S1 to S8 and S18 to S2
0, S22 to S25, the discharging operation to the preliminary chamber (23) and the conveying operation to the suction hopper (27) are performed in parallel during the circulation execution of the steps, and the target discharged to the preliminary chamber (23). The dried product (5) is immediately conveyed to the suction hopper (27).

When the discharge elapsed time reaches the predetermined discharge time (all the material to be dried (5) is discharged from the drying chamber (3) to the preliminary chamber (23)), the circulation is performed in S23. End with step, then step S26 is executed, step S25
The discharging operation in which the step has been executed and the time measurement of the discharge elapsed time are ended, and the time measured is reset.
Immediately after the end of such discharging operation, the material to be dried (5) is accumulated in the suction hopper (27) to the position of the upper limit level sensor (34) by the transportation of the material to be dried (5) in the preliminary chamber (23), Then pass S
In 7 steps, the transport operation is immediately stopped.

The dried material (5) accumulated in the suction hopper (27) is
It is melt-molded in the next-stage processing part. This is because the melt-molding is commanded in the state that the material to be dried (5) is accumulated up to the position of the upper limit level sensor (34) in the suction hopper (27). Is executed when the external command signal P is applied to the computer (36). That is, at this time, the opening / closing valve (33) is opened by the computer (36), and the material to be dried (5) is discharged from the suction hopper (27) to the next stage processing section. The on-off valve (33) is closed again when all the material to be dried (5) in the suction hopper (27) has been discharged. The released material (5) to be dried is melt-molded in the next-stage treatment section. In this case, the resin pellets, that is, the material (5) to be dried is dried in advance, so that the molding is performed well. .

After the step S26, the subsequent operations are performed in parallel with the operation from the discharging operation to the opening / closing of the opening / closing valve (33) so that the melt molding in the next-stage processing unit is executed.
First, steps S27 to S32 are sequentially executed. S
In step 27, the time counting operation is stopped by the elapsed time counter t. At this time, the timing content of the counter t represents the time required for a series of operations including the supply operation, the drying operation, and the discharging operation of the object to be dried (5). In step S28, the counter start flag is reset,
In step S29, it is checked whether or not the number of times reservation flag is set (no setting at present), and in step S30, it is checked whether or not the time reservation flag is set (no setting now). In step S31, the operation switch (37) is used to
It is determined whether 1) is turned on (in this case, it is turned on). In step S32, the contents of the elapsed time counter t are reset.

After that, as long as the continuous switch (38) is turned on, a series of operations including the supply operation, the drying operation, and the discharging operation of the material to be dried (5) are automatically and repeatedly executed to continuously connect the material to be dried (5). The target drying is performed, and good melt molding is sequentially performed in the subsequent processing section. Here, the automatic repetitive execution of the above series of operations is performed by the repetitive execution means of the present invention.

Here, when the processing capacity of the next-stage processing unit for the melt-molding is slow, the material to be dried (5) is accumulated in the suction hopper (27) and the preliminary chamber (23) while the series of operations is repeated. Will remain. Thus, in the state where the material to be dried (5) is accumulated in the preliminary chamber (23), this is judged in step S24 and the step S25 of performing the discharging operation is not executed, and the material to be dried (5) is not dried. Is left in the drying room (3). If such leaving is simply performed, the material to be dried (5) is naturally cooled and absorbs moisture again even if it is dried, but in this case, step S33 is executed. Such S
In step 33, exactly the same control as the drying operation in step S21 is performed, and the material to be dried (5) is kept at the set drying temperature by the microwave, so that the material to be dried (5) absorbs moisture again in the drying chamber (3). Is prevented.

Further, even if the material to be dried is supplied, if the transport operation is just being performed, the supply operation is not executed. That is, in this case, from S13 step to S34, S
The steps 35 and S36 are sequentially executed. In step S34, the supply operation is stopped, and in step S35, the time counting operation is stopped by the elapsed time counter t.
In step S36, the counter start flag is reset. Even when the operation of supplying the material to be dried (5) is currently being carried out and the situation is such that the carrying operation should be carried out, steps S13 to S34, S35, S3 are performed.
6 steps are sequentially executed.

When the continuous switch (41) is turned off, this is determined when the step S31 is executed, and then the step S37 is executed and the start flag is reset. After that, steps S1 to S9 are cyclically executed.

Now, a convenient microwave drying apparatus can be realized by continuously performing a series of operations including supply, drying, and discharging operations of the material to be dried (5), but such an apparatus can be realized. Furthermore, the continuous drying of the current material to be dried can be finished at any desired time point so that another kind of material to be dried can be immediately dried from any desired time point, which is more convenient.

Thus, the material to be dried (5) is thus obtained at any desired time.
In the case where it is desired to end the continuous drying, the points corresponding to the first configuration of the present invention will be described first.

In this case, after turning on the power, in a state of waiting for the operation information from the operation unit (37), the operation unit displays the current time information, the drying time, and the drying temperature together with the supply, drying, and discharging of the material to be dried (5). Set the number of times to repeat a series of actions. Here, the operating section (37) corresponds to the frequency setting means of the present invention. Then, these pieces of operation information are input, and the number of repetitions is set in the reservation number counter n.

After the information is input, steps S1 to S4 are followed by steps S38 and S39. In step S38, the number-of-times reservation flag is set, and in step S39, another light emitting diode (not shown) starts lighting, and it is displayed that the setting for ending the drying at a desired arbitrary time is made. After that, steps S6 to S9 are executed, and steps S1, S2, and S6 to S9 are cyclically executed.

Then, when the start key is operated on the operation unit (37), as described above, a series of operations of supplying, drying, and discharging the material to be dried (5) is repeatedly executed. Every time the operation of is completed once, the steps from S29 to S4
0, step S41 is sequentially executed, and step S32 is executed. At this time, in step S40, the content of the reservation number counter n is decremented by one. In step S41, the content of the counter n is 0 according to the result of the subtraction.
Is determined. That is, it is determined whether or not the above series of operations has been repeated the set number of times.

After that, when the above-described series of operations is repeated a set number of times, steps S41 to S42, S43, and S44 are executed. In each of steps S42 and S43, the number-of-times reservation flag and the start flag are reset, and in step S44, the buzzer (40) is sounded and the light emitting diode (39) is turned on, thereby ending the repetition of the series of operations. Be informed. After that, since the start flag is reset, after step S32,
The steps S1 to S9 are cyclically executed, and the above series of operations is stopped. From this, the step S42 of resetting the start flag corresponds to the stopping means of the present invention.

Here, at the desired time point of the end of the repetition of this series of operations, the material to be dried (5) does not exist in the drying chamber (3) so far, and from this time point, another type of material to be dried (5) cannot be dried. It is possible to smoothly shift to a series of operations relating to the material to be dried.

Next, in the case where it is desired to finish the continuous drying of the material to be dried (5) at a desired arbitrary time, the points corresponding to the second configuration of the present invention will be described.

In this case, after turning on the power, while waiting for the operation information from the operation unit (37), the operation unit sets the current time information, the drying time, and the drying temperature, and the end time T related to the above series of operations. to book set (the current after the time _{T 1).} Here, the operation unit corresponds to the end time setting means of the present invention. Then, step S45 is executed after step S1 to step S5, and the time reservation flag is set. After that, the steps S39 and S6 to S9 are executed and S
The steps 1 to S3 and S6 to S9 are cyclically executed.

Then, when the start key is operated, as described above, a series of operations relating to the above-mentioned supply, drying, and discharge are repeatedly executed. In this case, steps S30 to S46 are executed each time the series of operations is completed once. Executed, and the step S32 is executed. At this time, in step S46, it is determined whether the time (T ₁ + t) obtained by adding the required time t for one operation of the series of operations which has just ended to the present time T ₁ is before the reservation time T. Is judged. That is,
When the series of operations is repeated an arbitrary number of times, it is determined whether the remaining time until the reserved time T is longer or shorter than the required time t for the series of operations that have just ended.

After that, when the remaining time until the reserved time T becomes shorter than the required time t related to the immediately preceding series of operations after the above series of operations is repeated, step S47 is executed and the time reservation flag is reset. After that, similarly, S43 and S4
After steps S4 and S32, steps S1 to S9 are cyclically executed to stop the above series of operations.

Here, at this time as well, the desired material to be dried (5) does not exist in the drying chamber (3) at the desired end time of repeating the series of operations, and therefore, the drying target (5) cannot be separated from this time point in a short time. It is possible to smoothly shift to a series of operations relating to the types of dried objects.

When it is desired to correct the number of times of repetition or the reserved time T, the reservation correction key may be operated on the operation unit (37). In this case, steps S6 to S48 are executed to reset the count reservation flag and the time reservation flag.

(G) Effect of the Invention According to the present invention, in the continuous drying of the material to be dried by repeating the series of operations related to supply, drying and discharge of the material to be dried, the above series of operations is terminated at any desired time point. Therefore, it is possible to smoothly shift to a series of operations relating to another type of material to be dried, and thus it is possible to provide an extremely effective microwave drying device.

[Brief description of drawings]

The drawings show an embodiment of the present invention, FIG. 1 is a sectional view, FIG. 2 is a circuit diagram, and FIGS. 3a and 3b are flowcharts of an operation program of a microcomputer. (3) …… drying room, (4) …… supply pipe, (7) ……
Suction hopper, (10) ... intake pipe, (11) ... suction blower, (12) ... magnetron, (21) ... piston discharge valve,
(36) …… Microcomputer, (37) …… Operation part.

Claims (2)

[Claims] 1. A drying chamber, a supply device for supplying a material to be dried to the drying chamber, a microwave supplying means for supplying a microwave to the drying chamber for microwave drying the material to be dried, and a microwave drying device. A discharge device for discharging the material to be dried from the drying chamber, a repeat execution means for automatically and repeatedly executing a series of drive controls of the supply device, the microwave supply means, and the discharge device, the number of times of the series of drive controls. A microwave drying means for setting the number of times, and a stop means for stopping the series of drive controls when the series of drive controls are executed by the number of times set by the number of times setting means. apparatus. 2. A drying chamber, a supply device for supplying a material to be dried to the drying chamber, a microwave supply means for supplying a microwave to the drying chamber for microwave drying the material to be dried, and a microwave drying device. A discharge device for discharging the material to be dried from the drying chamber, a repeat execution means for automatically and repeatedly executing a series of drive controls of the supply device, the microwave supply means, and the discharge device, and the end of the series of drive controls. End time setting means for setting time, when the remaining time until the set end time is at least shorter than the time required for the microwave drying when the series of drive controls is repeated an arbitrary number of times, the series of drive controls A microwave drying device, characterized in that it is provided with a stopping means for stopping.