JPH02310011A - Microwave drier - Google Patents

Abstract

PURPOSE:To enable uniform microwave drying by ajitating sufficiently even a matter to bed dried with an agitating body, by injecting compressed air between a wall surface of a drying chamber close to the agitating body and the agitating body through a pipy shaft of the agitating body. CONSTITUTION:When a granular or powdery matter 5 to be dried is fed to a drying chamber 3 through a storage tank 6 by, for example, a blower 14, a microwave is fed within the drying chamber 3, the matter 5 to be dried is dried by the microwave and agitated by an agitating body 18 within the drying chamber. Although driving force for agitation is transferred to the agitating body 18 by a pipy shaft 19, an air compressor 12 injects compressed air between a wall surface 3a of the drying chamber 3 close to the agitating body 18 and the agitating body 18 through a plurality of openings 25 of the pipy shaft 19. With this construction, also the matter to be dried, which is hard to agitate so far and is between the wall surface of the drying chamber close to the agiting body 18 and the agitating body 18, is agitated by receiving force of the compressed air.

Description

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

(b) The conventional technique disclosed in Japanese Utility Model Application Publication No. 59-91592 discloses that microwaves are applied to a drying chamber into which the material to be dried is supplied to dry the material to be dried.
A microwave drying device for microwave drying is disclosed. The apparatus is provided with an agitator that stirs the material to be dried in the drying chamber so that the material to be dried is dried without any gaps.

However, in this case, the material to be dried that has accumulated between the bottom wall of the drying chamber and the agitator, which is close to the agitator, is difficult to be stirred by the agitator, and the C in the material to be dried is difficult to be stirred by the microwave drying. This may result in uneven drying and excessive drying. In extreme cases, the material to be dried may burn or melt.

(C) Problems to be Solved by the Invention The present invention aims to suppress uneven drying of the material to be dried between the wall surface of the drying chamber adjacent to the agitator and the agitator.

(d) Means for Solving the Problems The microwave drying apparatus of the present invention includes a drying chamber into which a granular or powdery material to be dried is supplied, and a microwave for microwave drying the material to be dried in the drying chamber. a microwave supply means for supplying waves; a stirring body for stirring the dried fertilizer solution in the drying chamber; a pipe-shaped shaft for transmitting stirring driving force to the stirring body; Compressed air is injected between the adjacent wall of the drying chamber and the stirring body.
and a means for generating compressed air.

(e) Action The material to be dried between the wall surface of the drying chamber adjacent to the agitator and the agitator is agitated by the force of compressed air.

(F) Embodiment FIGS. 1 to 5 show 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 body of the drying device (the main part has a main part that can be opened and closed freely)
A cylindrical drying chamber (3) with 2) is provided.

A supply pipe 4) is connected to the left side of the drying chamber, and the tip of the supply pipe is connected to the granular or powdery material to be dried (5).
) into the storage tank (6) that stores the water. Examples of the material to be dried (5) include resin pellets, rice, and powdered pharmaceutical products. The resin pellets can be molded after being completely melted, but if the resin pellets are dried prior to such melt molding, subsequent molding can be completed smoothly. In this embodiment, resin pellets are selected as the material to be dried (5).

In addition, there is a suction hole in the center of the lid (2) of the drying chamber (3).
bar (7) is connected. A filter wire mesh (8) having a mesh having a diameter smaller than the material diameter of the material to be dried (5) is arranged in the hopper, and a poppet valve (9) is located in one part of the filter wire mesh. The poppet valve (9) is connected to a compressed air generating means, i.e., -1-acomputer (12), via a tm valve (10) and a compressed air pipe (11), and Compressed air is supplied to the above two poppet valves (9) based on the opening of the solenoid valve (10) and the driving of the air breech 12), and the poppet valve (9) is driven to open.Then, At the upper part of the poppet valve (9), a suction blower (14) is connected to the suction hopper (7) via an intake pipe (13). When the blower (14) is driven in a state where
: and 1.1. The material to be dried (5) in the storage tank (6) passes through the supply pipe (4) and reaches the drying chamber (3).When the material to be dried (5) reaches the drying chamber (3), its own weight is stored in the drying chamber. It falls and accumulates.

Microwaves are supplied to the inside of the drying chamber (3) from a magnetron (15) via a waveguide (16). The magnetron (15) is connected to the duct (17)
It is connected to the compressor (12) via the compressed air pipe (11), and compressed air is supplied and cooled based on the drive of the compressor (12). I can do it.

Further, in the drying chamber (3), a stirring member 18) for stirring the material to be dried (5) is provided at a location close to the bottom wall (38) of the drying chamber. Such an agitator (18) is a pipe-shaped filter (18) that penetrates the bottom wall of the drying chamber (3 days).
9) With j=J fixed at the upper end, such a shirt I-(1
The lower end of 9) is one end (ll) of the compressed air pipe (11).
It is rotatably supported by a bearing (20) including a). Also, near the lower end of the shaft (19) is a pulley (
21) is fixed, and the pulley (21) is connected to one motor (24) via a belt (22) and four other pulleys (23). (By the way, when the Moog (24) is driven, the stirring driving force is transmitted to the stirring body 18) through the rear wheel l-<t9), and the stirring body 18) is rotated. The material to be dried (5) is completely stirred.

Therefore, the shaft 1 page 19) is connected to the compressed air pipe (11
)'+, and is connected to the near compressor (12) through the shaft (19), and a plurality of openings (25), (25), etc. are formed near the - upper end of the shaft (19). There is a recess (26) on the side of the stirring body (18).
(26)... is distorted. Opening (25) (25
)... and such a recess (26; 1 (26)... is a stirring body (1g) (F; each blade (18a)<18a)-
Correspondingly, the recesses (26) (26)... are mutually close to each other,'! are different. In the configuration of refusing,
When the near compressor (12) is driven, the machine J:
The compressed air is connected to the compressed air pipe (11) and shaft (19)
Open 1 (25) (25) through the stirring body (18
) and the drying chamber bottom wall (3a). As a result, although the action of the agitator (18) is difficult to reach during this time, the material to be dried (5) is completely (1°C) affected by the force of the compressed air that is injected as described above. , therefore the stirring body (1
8) and the drying chamber bottom wall (38).
ζ Dry evenly, avoid over-drying! -I don't have any problems. In this case, the compressed air 1.1 injected from the opening L-) (25) C25)... is 1 stirring body (18)
The flow of compressed air between the agitating body and the drying chamber bottom wall (38) along the different recesses (26 x 26). is complicated, and the material to be dried (5
) is sufficiently stirred to prevent excessive drying.

In addition, on the side wall of the drying chamber (3), place a chopstick, \ Lucenna (27), thermistor, etc. on the side wall of the drying chamber (3).
is located. The reher sensor (27) detects whether the object to be dried (5) has accumulated a predetermined amount of paper or is white in the drying chamber (3), and the temperature sensor 15e (28) detects the temperature of the object to be dried (5). Also, J2 drying room (3)! , M(2):
: An exhaust valve (29) is installed.
The opening of 9) is carried out when the object to be dried (5) is dried by one wave of the microphone, and water vapor generated during drying is discharged to the outside through the IJ air valve <29L2. At this time, stir the sea urchin (5) between (18) and the bottom wall (3 days) of the drying chamber (11≧−J−□<I+).
+1 shot': Due to the action of the compressed rice, water vapor passes through the exhaust pipe P (29>!) and is discharged to the outside,
Good drying is promoted.

Furthermore, the above? 2. There is a discharge valve (30) at the bottom right of the drying chamber (3).
Or installed] - [Iro. turn down? The 7F outlet valve (30) is connected to the ]-Aco>Brella'J- (12) via the solenoid valve (31) and compressed air pipe (11), and the opening of the 1m valve (31) and =r Compressed air is supplied to the above discharge; tH, (30:l) and the discharge valve (30) is driven to open.
The discharge valve (30) is opened when the material to be dried (5) is discharged from the drying/flue path.

Based on the opening of the JF rB 4t (30), the dried material (5) which is discharged under pressure drops into the preliminary chamber (33) through the discharge pipe (32) and accumulates therein. . A temperature removal heater (34) is arranged on the lower inclined wall of the preliminary room, and
In the terminal room (33), place the rotating body (35) on the south side.
- to] Rehinsa (36) is installed -1. In this way, the sensor (36) rotates the flow rotating body (35) and injects a predetermined amount of the material to be dried (IM) into the preliminary chamber (33).
) has accumulated, and the object to be dried (5) is a load on the C rotating body (35) and the rotating body (35), and the rotating body (35) cannot be rotated satisfactorily. At this time, a predetermined signal is output, and it is detected that a predetermined amount of the material to be dried (5) has accumulated.

4-F section of one end chamber (33) is a preliminary chamber (33), J
: It is connected to another suction hopper (37) located at a higher place through a conveying pipe (38). Decline suction hopper (
Similar to the suction hopper (7), the material to be dried (
A filter wire mesh (39) with a mesh smaller than the material diameter of item 5) is arranged, and a valve (40) is provided at the L portion of the filter wire mesh.'df
! -C near compressor (12) via Tl solenoid valve 41) and compressed air pipe (11)
Opening of the connection (cage, electromagnetic 141) and air:
Compressed air is supplied to the poppet box (4o) during the drive of the poppet valve (12), and the poppet valve (4o) is not driven to open. Then, 1-bovet valve (4
o) In the F part of L, the suction hopper (37〉) is also connected via the suction pipe (42〉!-5 suction hopper Y °〉〉〉)
4) are connected and become η. In this case, Bope, Toben (40
) is open and the air intake action of the blower (14) is turned off when the air blower (14) is driven by the air intake pipe (42).
, from the conveying pipe (38) via the suction hopper (37).
゛And the material to be dried (5 m) accumulated in the preliminary room (33) i1m
) passes through the conveying pipe (38) to the suction box (37).
) ζ Thank you. The material to be dried (5) is the suction filter 37
), it will fall into the ho/bar due to its own weight.

1: In the suction chamber (37), a heat insulating heater (43) is installed on one part of the sloped wall, and an on-off valve (44) is installed on the r end, and a Lower limit repair/sole (45) (46 pins are arranged, C color, F...
When the recording and closing valve (4I) is closed, the suction action works and the material to be dried (5) falls into the suction It-y bar (37). The object (5) accumulates, and when the opening/closing 7F (44) is opened, the object (5) to be dried, which has accumulated as shown in 2, falls into the next stage F)! m! The exposed drying material (5), that is, the resin material No. 1, is melt-molded.

Figure 6 shows the circuit of the microwave dryer described in 4E.
1lIJ Obe Toshitoni Exploration T [Product number LC- manufactured by Ki Co., Ltd.
65PG23 microphone I: J T, I interviewer (47
) is installed, and the computer receives operation information from the operating section (48) located on the front of one drying device (1), and temperature information from the 1st temperature register (28). ,
The above various types of HELSENRY (27>(36X45)(46
Based on the information etc. from the above magnetron (15
L motor (24), IJP air button (29), compressor/leather (12), heat retainer (34) (43), suction blower (14), tffillO> (31) (41
), on-off valves (44 valves).

FIG. 7 shows a flowchart of the operation valve block incorporated in the microcomputer (47), and the operation of the microwave drying apparatus will be explained below along the same flowchart.

1! After power is turned on, after S1 step, normally S2, S3,
Each step of S3a, S4, and S5 is executed cyclically. S
In the 1st Sudenbu, the first XIJ crotch promotion will be held. Immediately,
Microphone rI: All writable areas in the microphone 47) have been cleared, and the magnetron (47) has been cleared.
15), the motor (24), the compressor (12), the heat insulating heaters (34) (43), and the suction blower 17 (14) are placed in a stopped state, and the exhaust valve (29>, the exhaust valve (
30), bope・, throat jt (9>(40), on/off valve (4
4) are each placed in an open state. In the S2 stem, the operation information from the operation section (48) is input, and the S3 sleeve/
At step S3a, the lower limit sensor (46) determines whether or not the material to be dried (5) has fallen into the suction 1/2 bar (37), and in step S3a, the above lower limit sensor (36) Based on this detection, it can be determined whether or not there is a predetermined amount of the material to be dried (5) stored in the preliminary chamber (33). The S4 step knob checks the presence or absence of the start flag in the computer (47), and the S5 step checks the presence of the start flag in the computer (47).
The current operation unit (48) is based on the input information on the 2nd slide knob.
It is determined whether the start key is fully operated or not.

Therefore, when melt-molding the material to be dried (5), which is m-fat pellets, in order to ensure good molding, the material to be dried (5) must first be dried. Operation section (48 month trowel, set the desired drying time and drying temperature within the range of 20 to 60 minutes and 70 to 170°C by key operation, and turn on the continuous main f-(49)) The operation information is input in step S2.After that, when the start key is operated on the operation section (48), the S
This information is input with the 2nd knob 5, an affirmative judgment is made in S5 step C, the start flag is set in S6 step, and the J: reporter heater (34 ) (43) can now be started. That is, each of the above-mentioned heat-retaining heaters (34) (43) is desirably set so that the inside of the preliminary chamber (33) and the suction port (37) are maintained at the drying temperature set above. Therefore, the pre-chamber (33) and the suction bosoba (37)
) is kept warm at the above temperature.

Next, steps S8, S9, and S10 can be executed in sequence. In step S8: It is checked whether the transport flag in one computer (47) is set.
You can check what is missing.

In step S9, the operation of supplying the material to be dried (5) to the drying chamber (3) is completed. That is, the poppet valve (9) is opened by opening the solenoid valve (10) and driving the =1 breather (12).
> is opened and the suction blower (14) is driven, and the air is drawn from the storage tank (6) to the drying chamber by the suction action of the blower (14).
12- The material to be dried <5) is supplied into (3), and the motor (
24) is driven, the stirring body (18) rotates, and the drying chamber (
3) The upper surface of the material to be dried (5) 7b is turned into a smooth horizontal surface. For 310 Stemp, the above is ＼
As a result of the detection of the drying material (5), the upper surface of the material to be dried (5) reaches this position (27), and the material to be dried (5) is located in the drying chamber (3)! You can judge whether it has accumulated or not (
In this case, it is determined that the specified amount has not been accumulated.)

After that, S2, S3, S3a, S4, SLI, 88~S
Each step of IO is executed circularly. At this time, in the Sll step, it is checked whether or not the supply end flag in one computer (47) is set. Then, when a predetermined amount of the material to be dried (5) accumulates in the drying chamber (3) and this is determined in step S10, steps S12, S], and step 3 are executed. In step 312, the operation of supplying the material to be dried (5) to the drying chamber (3), which was completed in step S9, is completed. At step 313, the supply end flag is set.

After that, S2, S3, S3a, , S4, Sll, S14
The steps from S17 to S17 are executed cyclically. At this time, S1
In step 4, the computer (47) is checked to see if there is a comb that has completed drying, and the drying operation is executed in steps S15 and Z7'. That is, temperature sensor (2B)
Depending on whether or not the temperature of the material to be dried (5) detected by I has reached the set drying temperature,
5) is driven intermittently, and the material to be dried (5) is maintained at a drying temperature and subjected to microwave drying. -), motor (24)
is driven and the stirring body (18) is rotated, and compressed air is injected between the stirring body (18) and the drying chamber bottom wall (38), and the drying material (38) is injected. 5
) is thoroughly stirred so that it dries evenly. In addition, when the compressor (12) is driven, the exhaust valve (29) is opened, and the water vapor generated from the material to be dried (5) is actively discharged to the outside. 〉
The magnetron <15) is cooled by driving. Furthermore, in step S15, along with this drying operation, measurement of the elapsed drying time is started. In S16 SteSob, you can judge whether the elapsed drying time has reached the set drying time or not, and S17 Sde! In step S8, the presence or absence of the transport flag ``SEF 1'' is checked in the same manner as in step S8.

iTi L" (When the elapsed drying time reaches the set drying time, steps 318, Sl, and 9 are executed after step 316. In step 818, the drying operation performed in step 315 is executed. Then, the elapsed drying time "g" hours is completed and the time is thus counted, and the time "t" is reset.

In step 319, the L drying completion flag is set to 1).

And Sl, 7, C2, C3, S3a, 94, Sl
, after passing through 314 Sudenobu, S20. 321.522
Each step of S23 and S24 is executed sequentially.

Check whether there is a cent on the discharge flag in 320 Sudenzo Kei 7 Nbiyuk (47). In step S21, the above-mentioned health system detects the preliminary room (36) based on the detection by the sensor (36).
33>, it is determined whether a small predetermined amount of the material to be dried (5) has already accumulated. Drying room (3) in step S22
When the heat retention operation (described later) is being performed (j), this is completed and the discharge flag is set.82
The drying chamber (3) has not accumulated a predetermined amount of material to be dried (5) in the pre-@ chamber (33) at the 321 step.
) to the preliminary room (33). This is executed when the dried material (=15--dried material <5) is allowed to be newly discharged from the preliminary room (33), and in this step 823, the dried material ( 5) is discharged from the drying room (3) to the preliminary room (33).
In other words, the discharge valve (30) is opened by opening the solenoid valve (31) and driving the knob/tweezer (12), and the two-legged motor (24) is activated. Subsequently, the stirring body (18) is rotated, and as the stirring body (18) rotates, the material to be dried (5) near the stirring body (18) is pushed toward the surroundings. , dried material (5
) falls from the discharge valve (30) to the preliminary chamber (33) via the discharge pipe (32). The material to be dried (5) discharged in this way does not naturally cool down because the P end chamber (33) has been kept warm since step S7, and the material to be dried (5) discharged as described above does not naturally cool down. can be prevented from absorbing moisture again. Also, - in step 823 above, the elapsed time of such ejection is measured or the start beat is set, S2
In the 4th step, the elapsed elapsed elapsed time of elapsed evacuation is determined beforehand (this is sufficient time to eject all of the predetermined amount of material to be dried (5) stored in the drying chamber (3)).
It is possible to judge whether the target has been reached or not.

SoG) After, C2, C3, S3a, 84, S11, S14
, S20, S23, S24, and S17 are executed in a circular manner, and as a result of the discharge, the preliminary chamber (33)
When a small predetermined amount of material to be dried (5>
Each of the 28 steps is executed sequentially. In step 326, if the drying material supplying operation is currently being carried out by the S9 sub-section described in -1-, such operation is stopped. .S27 Step c1 is kept warm] - Suction port (37) from the terminal end chamber (33) - Dry material 5)
The operation of transporting F is executed t"+. That is, the electromagnetic force (41
) is opened and the reed vent, ff140) is opened, and the suction knob ff (14) is driven, and the suction valve (14) is opened, and the preliminary The material to be dried (
5) can be transported. 5- The material to be dried transported as in
5) is kept warm by the suction fan (37) or the S7 child Z-bu, so it does not naturally cool down.
The material to be dried is prevented from absorbing moisture and being stored at ℃. 32
In step 8, it is determined by the detection of the upper limit sensor (45) whether or not the material to be dried (5) has accumulated in the suction hopper (37) to the level of the sensing force.In this case, it is determined that no. ).

After that, S4.311, S14, S20, S23, S2
Steps 4, S17, and S27.828 are executed in a circular manner, and during ;-, the discharge operation to the preliminary chamber (33) and the conveyance operation of the suction hopper (37) are completed in parallel, and the preliminary chamber (
The material to be dried (5) discharged to 33) is immediately conveyed to the suction hopper (37).

Then, when the elapsed discharge time reaches the predetermined discharge time (all of the drying chamber (3) to the preliminary chamber (33) and the material to be dried (5) are discharged), then S29 and S30
．． Each step of 531 is executed sequentially.

In the S29 nullap, the discharge operation executed in the step S23 and the appropriate discharge B time of 1 o'clock are terminated (however, the compressor (12) does not stop because the conveyance operation is in progress), and the measured time is terminated. can be reset. In step S30, the supply end flag, drying path r flag,
tyh output flag is reset). In the S31 SSD ν, the speed reading swing (49) on the operation panel (4th) is
It is determined whether or not the

In this case, the continuous switch yf (49) is in the ON state, and after passing through 317 steps, S4, 311, S8, S
Each step of 27.328 is executed cyclically. Soshi 1,
The material to be dried (5) in y-@room 33 is transported [
When the material to be dried (5) accumulates in the suction hopper (37) up to the position of the upper limit level sensor (45), the S28 switch to S3
2. Step S33 is executed. In step S32, the conveyance operation executed in step S27 is stopped, and in step S33, the conveyance flag is reset.

The material to be dried (5) thus collected in the suction hopper (37) is melt-molded in the next processing section.
This is the upper limit level 1 sinza (
The process can be executed when an external command signal P for instructing melt molding is received in the computer (47) when the material to be dried (5) has accumulated up to the position 45). That is, at this time, the computer (47) operates the on-off valve (44).
) is opened, and the material to be dried (5) is sucked out (37)
The next stage processing section can be discharged. The opening/closing valve (44) is closed again when all of the material to be dried (5) in the suction hopper (37) is discharged. Then, the discharged material to be dried (5) is melt-molded in the next processing section! In this case, the resin base L□yl-, that is, the material to be dried (5) is dried in advance, so that the molding can be performed well.

Here, if the processing capacity of the next-stage processing section for the melt-forming is slow, 1.1 - Since the operations from supplying dried fertilizer liquid to conveying operations are repeated, the suction hopper (37
) and the drying material (5) remains in the preliminary chamber (33). Therefore, if the drying material (5) is accumulated in the preliminary chamber (33) and the drying material (5) is further attempted to be discharged from the drying chamber (3), this will occur in step S21. It is judged by
That is, if more than a predetermined amount of the material to be dried (5) has accumulated in the preliminary chamber (33), the material to be dried (5) is transferred from the drying chamber (3) to the preliminary chamber (33).
) is determined not to be allowed to be newly discharged.

Then, the dried material (5) is left as it is in the drying room (3) even after drying. However, in the embodiment of the present invention, this is prevented. At this time, step S34 is executed. That is, in step S34, step 7 is executed. , 815 step, the drying operation is controlled exactly the same as the drying operation at step 815.
) is kept at the set drying temperature by the microphone 0 pump, thus preventing the material to be dried (5) from absorbing moisture again in the drying chamber (3).

The above-mentioned series of operations is completed by continuous switching (49 seconds). That is, at such off time, 831 sde 7
When step S35 is executed, step S35 is executed.
The start flag is reset and each of the heat retainers (34)<43) is stopped. Then S2
, S3. Steps S3a, S4, and S5 can be executed cyclically.

(1.) Effects of the Invention According to the present invention, the pipe-shaped 7-1. Compressed air is radiated 11 times through F, d, stirring 11 body, stirring F, hard to sag l, dry wall surface and lt 411
It is possible to sufficiently stir the material to be dried between the
Uniform;・Iku ``I can perform S wave drying and repetition.

In history, Mike fJ wave drying and smoke t1 due to I injection compression empty
It is possible to actively exhaust the emitted water vapor into the drying room, promoting good microphone wave drying and smoke.

[Brief explanation of drawings]

Ekoi;! : 4: Shows an embodiment of the invention, FIG. 5 and 5 are cross-sectional views taken along lines IV-IV and ■-v in FIG. 3, respectively, FIG. 6 is a circuit diagram, and FIG.
It is a flowchart of τ-gram. <3)...Drying chamber, (12)...Air: JTsuburet→), (15>...Macnetron, (18>...Stirring body, <19)...Pipe-shaped shaft .

Claims (1)

[Claims] (1) A drying chamber to which a granular or powdery material to be dried is supplied; a microwave supply means for supplying microwaves for microwave drying the material to be dried to the drying chamber; A stirring body that stirs the dried material, a pipe-shaped shaft that transmits stirring driving force to the stirring body, and compressed air between the wall surface of the drying chamber that is close to the stirring body via the shaft and the stirring body. A microwave drying device consisting of a means for generating compressed air.