JPH02258215A - Microwave heating device - Google Patents

Abstract

PURPOSE:To shorten the time for transferring by a method wherein a frequency setting means, which sets the frequency of a series of driving controls, and a stepping means, which stops a series of the driving controls when a series of the driving controls are carried out by the frequency set by said frequency setting means, are equipped. CONSTITUTION:When the continuous drying of material to be dried is wanted to be finished at the arbitrary desired time point, the frequency of a series of actions consisting of the supplying-, drying- and discharging-actions together with present time information, drying time and drying temperature is set under the condition that operation information sent from an operating unit 37 after the power supply is put to work, is waited. After that, by operating a starting key at the operating unit 37, a series of actions consisting of supplying-, drying- and discharging-actions is carried out repeatedly. In this case, every time when a series of the actions finished at one time, the contents of a reserved frequency counter (n) is decremented by one. After that, when a series of the actions is repeated by set repeating frequency, a frequency reserving flag and a starting flag are reset and the finish of the repetition of a series of the actions is announced.

Description

[Detailed description of the invention] (b) Industrial application fields The present invention relates to a microwave drying device.

(b) In the conventional microwave drying apparatus disclosed in Japanese Utility Model Publication No. 59-91592, a material to be dried is supplied to a drying chamber, the supplied material is subjected to microwave drying, and then dried. The work of drying the dried material is performed through a series of operations in which the dried material is discharged from the chamber.

Therefore, in such an apparatus, if a series of operations related to supplying, drying, and discharging the material to be dried are repeatedly and automatically carried out, it is convenient for continuous drying of the material to be dried. In this case, it is possible to end the series of operations currently being repeated at any desired point in time to complete the continuous drying of the object to be dried, and then smoothly transition to the above series of operations related to another type of object to be dried. This is even more convenient.

(c) Problems to be Solved by the Invention The present invention provides for continuous drying of a material to be dried by repeating a series of operations related to supplying, drying, and discharging the material to be dried. The purpose is to finish the operation and smoothly transition to a series of operations related to another type of material to be dried, and to shorten the time required for this transition as much as possible.

(d) Means for Solving the Problems The microwave drying apparatus of the present invention has a first configuration including a drying chamber, a supply device for supplying the material to be dried to the drying chamber, and a microwave drying device for drying the material to be dried. a microwave supply means for supplying microwaves to the drying chamber, a discharge device for discharging the microwave-dried material to be dried from the drying chamber, a series of the supply device, the microwave supply means, and the discharge device; In addition to the basic configuration consisting of a repetition execution means for automatically repeatedly performing the drive control, a number setting means for setting the number of times the series of drive controls is performed, and a number of times the series of drive controls is performed by the number of times set by the number setting means. A stop means is provided to stop the series of drive controls when the above is executed.

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

(e) Effect In the first configuration, in 6 of the setting of the number of times of a series of drive controls related to supplying, drying, and discharging of the material to be dried, the point in time when the series of drive controls described above has been executed the number of times. At this point, the series of drive controls described above is stopped, and from this point on, it is possible to smoothly shift to a series of drive controls related to another type of material to be dried in a short time.

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

(F) Embodiment FIG. 1 shows the structure of a microwave drying apparatus according to an embodiment of the present invention, which consists of a drying apparatus main body (1) and peripheral mechanisms thereof.

The main part of the drying apparatus (1) is provided with a cylindrical drying chamber (3) having an upper lid (2) that can be opened and closed.

A supply pipe (4) is connected to the upper left part of the drying chamber, and the tip of the supply pipe is connected to the granular or powdery material to be dried (5).
) has reached the reservoir 1 (6) where it is stored. Examples of the material to be dried (5) include resin pellets, rice, and powdered pharmaceutical products. The resin pellet is molded after being melted, but if the resin pellet is dried prior to such melt molding, subsequent molding will be performed better. In this embodiment, a resin pellet is selected as the material to be dried (5). Further, 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 a poppet valve (9) is located above the filter paper.
is provided. At the top of the poppet valve (9), the suction hopper (7) is connected to the suction pipe (1).
A suction blower (11) is connected via the air conditioner 0). In this case, if the blower (11) is driven with the poppet valve (9) open, the suction action of the blower (11) will affect the suction pipe (10), the suction hopper (7), and the drying chamber (3). ) to the supply pipe (4), and the material to be dried (5) in the storage tank (6) passes through the supply pipe (4) to the drying chamber (3). The material to be dried (5) is placed in the drying room (3)
When this happens, it falls and accumulates inside the drying chamber due to its own weight. Here, the supply vibrator (4), the suction hopper (7), the suction pipe (10), and the blower (11) constitute a supply device that supplies the material to be dried (5) to the drying chamber (3).

In the drying chamber (3), there is a magnetron (12) which is a microwave supply means to a waveguide (13).
Microwaves are supplied through the
4), which stirs the material to be dried (5).
) is provided. A level sensor (16) and a temperature sensor (1) such as a thermistor are installed on the side wall of the drying chamber (3).
7) is located. The level sensor (16) detects whether a predetermined amount of the material to be dried (5) has accumulated in the drying chamber (3), and the temperature sensor (17) detects the temperature of the material to be dried (5). . Further, a compressor (19) is connected to the left bottom of the drying chamber (3) via an intake valve (18), and an exhaust valve (20) is provided at the upper N (2) of the drying chamber (3). There is. The drive of these compressors (19) and the opening of the intake valve (18) and exhaust valve (20) are
), and the water vapor generated during drying is discharged to the outside through the exhaust valve (20) together with the air from the compressor (19). Further, a piston discharge valve (21) serving as a discharge device is provided at the right bottom portion of the drying chamber (3). The discharge valve is driven to open when the dried material (5) is discharged, and at this time, the dried material (5) is discharged through the discharge pipe (22). ) is then the lower reserve room (23
) and accumulate.

In the preliminary chamber (23) where the material to be dried (5) is accumulated, a heat-retaining heater (24) is arranged on the lower sloped wall of the preliminary chamber (23), and a rotating body (25) is installed in the preliminary chamber (23). A level sensor (26) is provided. Such a level sensor (26) normally rotates the rotating body (25), and when a small predetermined amount of the material to be dried (5) accumulates in the preliminary chamber (23), the rotating body (25) tries to rotate. However, when the object to be dried (5) is a load and the rotating body (25) cannot be rotated satisfactorily, a predetermined signal is output and a predetermined amount of the object to be dried (5) is accumulated. detect that there is a

The lower part of the preliminary chamber (23) is connected to a conveying pipe (28) to another suction hopper (27) located higher than the preliminary chamber (23).
) are connected through. Similar to the suction hopper (7), the suction hopper (27) also has a filter wire mesh (29a) having a mesh smaller than the material diameter of the material to be dried (5).
) and a filter paper (29) are arranged, and a poppet valve (3o) is provided above the filter paper. And, at the top of the poppet valve (3o),
The suction blower (11) is also connected to the suction hopper (27) via an intake pipe (31). In this case, the poppet valve (30) is opened and the blower (11
), the suction action of the blower (11) extends to the conveying pipe (28) via the suction pipe (31) and the suction hopper (27), and the drying material ( 5) passes through the conveying pipe (28) and reaches the suction hopper (27). The material to be dried (5) is transported to the suction hopper (
27), it falls into the hopper due to its own weight. In the suction hopper (27), a heat insulating heater (32) is arranged on the lower inclined wall, an on-off valve (33) is provided at the lower end, and upper and lower limit level sensors (34) (35) are provided at the lower end. ) are placed. The above on-off valve (3
In closing step 3), when the suction action works and the material to be dried (5) falls into the suction hopper (27), the material to be dried (5) accumulates in the suction hopper (27), while the on-off valve When (33) is opened, the dried material (5) that accumulates like this
falls downward and reaches the next processing section, where the dried material (5), ie, the resin pellet, is melt-molded and molded.

Figure 2 shows the circuit of the microwave drying device, and the main control section is a part number LC-65PG23 manufactured by Sanyo Electric Co., Ltd.
A microcomputer (36) is provided, and the computer receives operation information from the operation section (37) disposed on the front of the drying device main body (1) and temperature information from the temperature sensor (17). , the above various level sensors (16
) (26) (34) (35) Based on the information etc.
The above magnetron (12), motor (14), intake valve (18), exhaust valve (20), compressor (19), discharge valve (21), heat retention heater (24) (32), suction blower (11), Poppet valves (9) (30), on-off valves (33
) and the time display section (38) and light emitting diode (
39) and a buzzer (40).

FIG. 3 shows a flowchart of the operation program installed in the microcomputer (36), and the operation of the microwave drying apparatus will be explained below along the same chart.

First, when the power is turned on, the microcomputer (
36) has undergone an initial setting operation and is in a state of waiting for operation information from the operation section (37). In the above initial setting operation, all writable areas in the microcomputer (36) are cleared, and the magnetron (12), motor (14), and compressor (19) are cleared.
), heat retention heater (24) (32), suction blower (11)
, the time display section (38), the light emitting diode (39), and the buzzer (40) are placed in a stopped state, and the intake valve (
18), an exhaust valve (20), an exhaust valve (21), poppet valves (9), (30), and an on-off valve (33) are each placed in a closed state. In addition, in the state of waiting for the above operation information, the setting of the current time information is first waited, and therefore the operation section (37)
When the current time information is set by key operation, such information is input, and the current time is thereafter updated in the computer (36) based on the time information.

When the object to be dried (5), which is a resin pellet, is to be melt-molded and the object to be dried (5) is dried in advance so that such forming can be performed well, the operation section (37) , set the desired drying time and drying temperature within the range of 20 to 60 minutes and 70 to 170°C by key operation, respectively.
Then, turn on the continuous switch (38). Then, these operation information are inputted, and each step from 5l to 59 is executed cyclically. In the Sl step, the current time T, which is updated sequentially, is displayed on the time display section (38), and the S
In the 2nd step, it is checked whether the number of times reservation flag is set in the computer (36) (currently not set), and in the S3 step, the presence or absence of the time reservation 7 lag set in the computer (36) is checked (currently not set). In step S4, the number of reservations counter nl in the computer (36) is
:: It is determined whether 1 or more is set (
(Currently set to O). In step S5, it is determined whether the reserved time T has been set and whether or not the reserved time T is after the current time T1. In this case, since the reservation time T has not been set, step S6 is executed next. In step S6, it is checked whether the reservation modification key in the operation section (37) has been operated (currently not operated).
. In step S7, a transport operation is performed as necessary. There is no need for this at present, and the conveyance operation is not performed, so the details of this operation will be described later. In step S8, it is checked whether the start flag in the computer (36) is set (currently not set), and in step S9, it is checked whether the start key in the operation section (37) has been operated (currently not set). .

After that, when you operate the start key on the operation unit (37),
The cyclic execution of steps 51 to S9 described above ends at step 89, and each step of SIO to S17 is executed. S10
In the step, the light emitting diode (39) and the buzzer (
40) are turned on and ringing, these are stopped. In the Sll step, the start flag is set, and in the S12 step, each of the heat retention heaters (24) (3) is set.
2) drive control is started. That is, the above preliminary room (23
) and the suction hopper (27) so that the drying temperature is approximately maintained at the set drying temperature.
32) is intermittently driven at a desired ratio, so the preliminary chamber (23) is driven intermittently at a desired ratio.
) and the inside of the suction hopper (27) are kept at the above temperature.

In step S13, it is determined whether or not a transport operation is currently being performed (it is not currently being performed). In step 514, 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 suction action of the blower (11) causes the storage 11! (6) into the drying chamber (3).
) is supplied, and the motor (14) is driven to rotate the agitator (15), so that the upper surface of the material to be dried (5) supplied into the drying chamber (3) is aligned with a smooth horizontal surface. . S
In step S15, it is checked whether or not the counter start flag in the computer (36) is set (it is currently not set), in step S16, the elapsed time counter t in the computer (36) starts to measure time, and in step S17, the counter start flag t is checked. The start flag is set.

After that, steps S1 to S8, 518, and 513 to S15 are executed in a circular manner. At this time, in step S18, the level sensor (16) detects whether the upper surface of the object to be dried (5) has reached the position of this sensor (16) and a predetermined amount of the object to be dried (5) has accumulated in the drying chamber (3). It is determined whether or not (in this case, it is determined that the predetermined amount has not been accumulated). Note that once it is determined that a predetermined amount has accumulated, this determination is maintained until the dried material (5) thus accumulated is subsequently discharged.

Then, a predetermined amount of the material to be dried (5) accumulates in the drying chamber (3),
If this is determined in step 818, then S19
Each step of S20 and S21 is executed sequentially. S19
In step 814, the dried material (5
) is completed, and in step S20, a drying operation (described later) is executed, and it is determined whether the elapsed drying time has reached the set drying time (currently). In this case, the drying operation is not being performed and a negative determination is made). It should be noted that once the determination is made that the drying chamber (3) has reached the point where the drying material (5) currently stored in the drying chamber (3) is discharged, the determination is continued. In step 521, a drying operation is performed. That is, the temperature sensor (
Depending on whether the temperature of the material to be dried (5) detected by the magnetron (17) has reached the set drying temperature,
2) is driven intermittently, the material to be dried (5) is maintained at a drying temperature and subjected to microwave drying, and the motor (14) is driven again to rotate the agitator (15) to dry the material to be dried (5). ) is stirred to dry evenly, and the compressor (19) is driven and the intake valve (18) and exhaust valve (20)
is opened, and water vapor generated from the material to be dried (5) is discharged to the outside. Furthermore, in step S21, along with such drying operation, measurement of the elapsed drying time is started.

Thus, steps 5l-38, 318 to S21 are executed in a circular manner, and then when the elapsed drying time reaches the set drying time, the circular execution of steps 5t-58, 818 to S21 is completed at step S20, and then 522 The steps from S25 to S25 are sequentially executed. 52 in S22 step
The drying operation performed in one step and the measurement of elapsed drying time are terminated, and the measured time is reset. In step S23, a discharge operation (described later) is executed and the discharge elapsed time is a predetermined discharge time (this is a predetermined amount of material to be dried stored in the drying chamber (3)).
5), which is sufficient time to completely discharge the liquid, is determined. In this case, the ejection operation is not being executed, and a negative determination is made. In step S24, it is determined based on the detection by the level sensor (26) whether or not a small predetermined amount of the material to be dried (5) has already accumulated in the preliminary chamber (23) (in this case, a negative 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 7 of 525, when a heat-retaining operation (described later) is being performed in the drying chamber (3), this is terminated.

In step S25, a discharge operation is performed to discharge the dried material (5) from the drying chamber (3) to the preliminary chamber (23). That is, the discharge valve (21) is opened and the motor (14) is continuously driven to discharge the agitator (1).
5) is rotated, and as the agitator (15) rotates, the object to be dried (5) near the agitator (15) is pushed to the surrounding area, and the object to be dried (5) is moved to the discharge valve (21). Discharge vibrator (2
2) and is discharged down to the preliminary chamber (23). The material to be dried (5) discharged in this way does not cool down naturally because the preliminary chamber (23) is kept warm from the step 512, and the material to be dried (5) is discharged as it is naturally cooled.
is prevented from absorbing moisture again. Also, the above S2
In step 5, counting of elapsed time of such evacuation is started.

Then, each step of 8l-S8, S18-S20, and S22-S25 is executed in circulation, and during this time, a small predetermined amount of the material to be dried (
5), as long as the dried material (5) is accumulated in this way, the dried material is transferred from the preliminary chamber (23) kept warm to the suction hopper (27) in step S7. (5) A conveyance operation for conveying is performed. That is, the poppet valve (30) is opened and the suction blower (11)
is driven, and the preliminary chamber (
23) to the suction hopper (27). However, as a result of such conveyance, the material to be dried (
5) accumulates to the position of the sensor, the above-mentioned conveyance operation is automatically terminated. The material to be dried (5) conveyed in this way is not naturally cooled because the suction hopper (27) has been kept warm since the step 512, and the material to be dried does not absorb moisture again. is prevented.

Therefore, the above 5l-S8, S18~S20% S22~
During the circulation of each step in S25, the preliminary chamber (
The discharge operation to 23) and the conveyance operation to the suction hopper (27) are performed in parallel, and the dried material (5) discharged to the preliminary chamber (23) is immediately conveyed to the suction hopper (27).

Then, when the elapsed discharge time reaches a predetermined discharge time (all the materials to be dried (5) are discharged from the drying chamber (3) to the preliminary chamber (23)), such circulation execution is performed at 523. The process ends with step S26, and then step S26 is executed.
The ejection operation performed in five steps and the elapsed elapsed elapsed time measurement are terminated and the time thus measured is reset. Immediately after the completion of such discharge operation, the dried material (5) is transported in the preliminary chamber (23), and the dried material (5) accumulates in the suction hopper (27) up to the position of the upper limit level sensor (34).
The conveyance operation is immediately stopped in the backward step S7.

The material to be dried (5) accumulated in the suction hopper (27) in this way
is melt-molded in the next processing section;
When an external command signal P for instructing melt molding is given to the computer (36) in a state where the material to be dried (5) has accumulated in the suction hopper (27) up to the position of the upper limit level sensor (34). is executed. That is, at this time, the on-off valve (33) is opened by the computer (36),
The material to be dried (5) is discharged from the suction hopper (27) to the next processing section. The above-mentioned on-off valve (33) is the suction hopper (27)
It is closed again when all of the material to be dried (5) inside is released. Then, the discharged material to be dried (5) is melt-molded in the next processing section, and in this case, the resin pellet, that is, the material to be dried (5) is dried in advance, so that the molding can be performed well. .

After the step S26, the following operations are performed in parallel with the discharge operation and the operation until the on-off valve (33) is opened and closed so that melt molding is performed in the next processing section. First, steps 527 to 532 are sequentially executed. In step S27, the time counting operation is stopped by the elapsed time open counter t. The time measurement content of the counter t represents the time required for a series of operations consisting of the supply operation, drying operation, and discharge operation of the material to be dried (5), 828.
In step S29, the counter start flag is set, and in step S29, it is checked whether or not the number of times reservation flag is set (currently it is set), and in step S30, it is checked whether or not the time reservation flag is set (currently not set). In step S32, the contents of the elapsed time counter t are reset. .

From then on, as long as the continuous switch (38) is turned on, a series of operations consisting of supplying, drying, and discharging the object to be dried (5) is automatically and repeatedly performed.
Continuous drying is carried out, and good melt molding is successively performed in the subsequent processing section. Here, the automatic repeated execution of the above series of operations is performed by the repeated execution means of the present invention.

Here, if the processing capacity of the next-stage processing section for the melt-molding is slow, the drying material (5) is stored in the suction hopper (27) and the preliminary chamber (23) while the above series of operations is repeated.
remains accumulated. Therefore, if the material to be dried (5) has accumulated in the preliminary chamber (23), this is determined in step S24 and the step S25, which performs the discharge operation, is not executed, and the material to be dried (5) is not stored after drying is completed. They are also left in the drying room (3). If such leaving is simply carried out, the material to be dried (
5), even if it is dried, it is naturally cooled and absorbs moisture again. In this case, step S33 is executed.

In step S33, the same control as the drying operation in step S21 is performed, and the object to be dried (5) is kept warm at the set drying temperature using microwaves, so that the object to be dried (5) is kept in the drying chamber (3). This prevents moisture from being absorbed again.

Moreover, even if the feeding operation of the material to be dried is carried out, if the conveying operation is just being carried out, the above-mentioned feeding operation will not be executed. That is, in this case, steps S13 to S34. S3
5. Each step of S36 is executed sequentially. In step S34, the above-mentioned supply operation is stopped, and in step S35, the time counting operation is stopped at the elapsed time counter t, and S
At step 36, the counter start flag is reset. Incidentally, even if the feeding operation of the material to be dried (5) is currently being carried out and it becomes necessary to perform the conveying operation from now on, the steps from S13 to S34, S35, and S36 are performed.
Each step is executed sequentially.

If the continuous switch (38) is turned off, this is determined when step S31 is executed, then S37
The step is executed and the start flag is reset. After that, steps S1 to S9 are executed cyclically.

Now, a series of operations consisting of feeding, drying, and discharging the material to be dried (5) is repeatedly executed to perform continuous drying, thereby realizing a convenient microwave drying device. It is further advantageous that the continuous drying of the current object to be dried can be terminated at any desired time so that another type of object to be dried can be immediately dried at any desired point.

In this way, the material to be dried (5) can be dried at any desired time.
When it is desired to terminate the continuous drying of the wafer, the points corresponding to the first configuration of the present invention will be explained first.

In this case, after turning on the power, while waiting for operation information from the operation unit (37), the operation unit displays the current time information, drying time, and drying temperature as well as the supply, drying, and discharge of the material to be dried (5). Sets the number of repetitions for a series of actions. Here, the operation section (37) corresponds to the number of times setting means of the present invention. Then, these operating information will be entered,
The number of repetitions is set in the reservation number counter n.

After inputting such information, steps 51-34 are followed by steps 538 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, indicating that settings have been made to end drying at any desired time. Thereafter, steps S6 to S9 are executed, and steps S1, S2, and S6 to S9 are executed cyclically.

Then, when the start key is operated on the operation unit (37), a series of operations consisting of supplying, drying, and discharging the material to be dried (5) is repeatedly executed as described above, but in this case, Steps 529 to 840 and 541 are sequentially executed every time the operation of step S32 is completed.
Step is executed. At this time, in step S40, the content of the reservation number counter n is decremented by one. S41
In step, it is determined whether the contents of the counter n have become 0 or not based on the result of this subtraction. That is, it is determined whether or not the above series of operations has been repeated a set number of times.

Thereafter, when the series of operations described above is repeated a set number of times, steps S41 to S42, S43, and S44 are executed. In steps S42 and S43, the number reservation flag and start flag are reset, and in step S44, the buzzer (40) sounds and the light emitting diode (39) lights up, thereby ending the repetition of the above series of operations. be notified. Thereafter, since the start flag was reset, after step S32, steps 81 to S9 are executed in a circular manner, and the series of operations described above is stopped. For this reason, the above-mentioned step S42 for resetting the start flag corresponds to the stopping means of the present invention.

Here, at the desired point of completion of the repetition of this series of operations, there is no existing material to be dried (5) in the drying chamber (3), and therefore, from this point on, another type of material is removed in a short period of time. It is possible to smoothly move on to a series of operations related to the object to be dried.

Next, the points corresponding to the second configuration of the present invention will be explained when it is desired to finish the continuous drying of the dried material (5) at any desired time.

In this case, after turning on the power, while waiting for operation information from the operation unit (37), use the operation unit to set the current time information, drying time, and drying temperature, and also set the end time T related to the above series of operations. (!II! After the current time T1) is reserved. Here, the above-mentioned operation section corresponds to the end time setting means of the present invention. Then.

Following step 5l-35, step S45 is executed and the time reservation flag is set. After that, S39, S
Each step of 6 to S9 is executed, and S1 to S3, S6
-S9 steps are executed cyclically.

Then, when the start key is operated, the series of operations related to supplying, drying, and discharging are repeatedly executed as described above, but in this case, steps S30 to 846 are executed every time the series of operations is completed. is executed, and step S32 is executed. At this time, in step 546, the time (T, +
t) is before the above-mentioned reserved time T.

That is, when the series of operations described above 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 has just ended.

Thereafter, if the remaining time until the reservation time T after repeating the series of operations described above becomes shorter than the required time t for the immediately previous series of operations, step S47 is executed and the time reservation flag is reset.

Thereafter, steps S43, S44, and S32 are followed by steps 51-S9 in a circular manner, and the series of operations described above is stopped.

Here, at this time as well, at the desired point in time when this series of operations is repeated, the object to be dried (5) is no longer present in the drying chamber (3), and therefore, the drying material (5) is separated from this point in a short time. It is possible to smoothly transition to a series of operations related to the types of materials to be dried.

Incidentally, if it is desired to modify the above-mentioned number of repetitions or reservation time T, the reservation modification key may be operated on the operation section (37). In this case, steps S6 to 848 are executed to reset the number of times reservation flag and time reservation flag.

(G) Effects of the Invention According to the present invention, in continuous drying of the object to be dried by repeating a series of operations related to supplying, drying, and discharging the object to be dried, the above-mentioned series of operations can be completed at any desired point. Therefore, it is possible to smoothly shift to a series of operations related to another type of material to be dried, thereby providing an extremely practical microwave drying apparatus.

[Brief explanation 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 the operating program of the microcomputer. (3)... Drying room, (4)... Supply pipe, (7)
... Suction hopper, (10) ... Suction pipe, (11
)...Suction blower, (12)...Magnetron, (
21)...Piston discharge valve, (36)...Microcomputer, (37)...Operation unit.

Claims (2)

[Claims] (1) A drying chamber, a supply device for supplying the material to be dried to the drying chamber, a microwave supply means for supplying microwaves to the drying chamber for microwave drying the material to be dried, and a microwave-dried material for the drying chamber. A discharge device for discharging the dried material from the drying chamber, a repetition execution means for automatically repeatedly performing a series of drive controls of the supply device, the microwave supply means, and the discharge device, and setting the number of times the series of drive controls is performed. A microwave drying apparatus characterized by comprising: a number of times setting means for setting the number of times the number of times setting means is performed; and a stopping means for stopping the series of drive controls when the series of drive controls has been executed the number of times set by the number of times setting means. (2) A drying chamber, a supply device for supplying the material to be dried to the drying chamber, a microwave supply means for supplying microwaves to the drying chamber for microwave drying the material to be dried, and the material to be dried by microwaves. A discharge device for discharging the dried material from the drying chamber; a repeating means for automatically and repeatedly executing a series of drive controls for the supply device, the microwave supply means, and the discharge device; and an end time for the series of drive controls. end time setting means for setting the series of drive controls, if the time remaining 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 is stopped; A microwave drying device characterized by comprising a stop means for stopping the drying.