JPH03156280A - Microwave drier - Google Patents

Abstract

PURPOSE:To vertically move an agitating blades even if a material to be dried is introduced between the inner wall of a drying chamber and the blades, and to smoothly rotate without engagement with the material to be dried by so mounting agitating means at driving means as to vertically move. CONSTITUTION:If a material 7 to be dried of a predetermined amount is sup plied, a microwave is radiated to start drying. In the case of drying, agitating blades 3 are rotated to lift moisture generated from the material 7 near the bottom to improve heating irregularity to the material 7, thereby uniformly drying it. When the material 7 is held in a gap between the rotating blades 3 and the inner wall of a drying room 2, it rides on the blades 3 on the material 7. The blades 3 are moved upward while rotating to ride over the material 7. It continuously rotates while pressing to remove the material 7 by its own weight. Thus, since the blades 3 can be vertically moved, the rotation is smooth to contribute to a reduction in troubles of a device.

Description

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

(b) Conventional technology Conventionally, as shown in Utility Model Publication No. 1-21518, the material to be dried supplied into a heating chamber was dried by irradiating microwaves while rotating a stirring blade. .

(c) Problems to be solved by the invention In the conventional technology, when drying materials such as sugar beet pellets, rice, and powdered pharmaceutical products, the materials to be dried are mixed between the stirring blade and the heating chamber. There is no consideration given to what would happen if it got into the gap between the stirring blade and the wall, so if it got into the stirring blade while it was rotating, the stirring blade would not rotate smoothly and there is a risk that it would stop rotating.

The present invention is intended to solve these problems.

(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 wave supply means; a stirring means disposed in the drying chamber to stir the material to be dried;
The stirring means is constituted by a drive means which is connected to rotate the stirring means so that the stirring means can move up and down.

(E) While drying the material to be dried while stirring it with the working stirring blade,
Even if the material to be dried gets caught between the wall of the drying chamber and the stirring blade, the stirring blade moves up and down and rotates smoothly without being caught by the material to be dried.

(f) Example The microwave drying apparatus (1) of the present invention will be explained based on FIG. The material (7) is fed into the cylindrical drying chamber (2) from the supply pipe (4) by the suction action of the blower (5) through the poppet valve (8) by the drive of the mouth-and-pull blower (5). It is supplied until a constant value is detected by the level sensor (20). Then, while rotating the stirring blade (3) serving as the stirring means, microwaves are transmitted from the magnetron (9) to the drying chamber (2) via the waveguide (10).
The temperature of the object to be dried (7) is detected by the thermistor (21), the temperature is controlled, and the object to be dried (7) is dried. Thereafter, the piston-type discharge valve (11) is opened, and the discharge is discharged into the preparatory chamber (13) via the discharge pipe (12), waiting for discharge to the molding machine.

Next, the structure of the gist of the present invention is shown in FIGS. 2, 3, and 4.
This will be explained based on the diagram. The shaft (1) to which the stirring blade (3) is fixed
4) is a bearing (15) that protrudes downward from a through hole approximately in the center of the bottom of the drying chamber (2) and is fixed to the outer bottom of the drying chamber (2).
) for rotation and vertical movement, and a shaft (1
4) The lower end is inserted into the joint case (17).

Inside the joint case (17), an electric motor (
16) is inserted, and this rotation shaft (22) is inserted.
) is fixed with a shaft coupling (23). This shaft coupling (
23) is provided with a vertical hole (24) into which the shaft (14) of the stirring blade (3) is inserted, and a pair of left and right vertical slots 7) (18) that reach this vertical hole (24) from the circumferential side. .

Then, the shaft (14) of the stirring blade is inserted into the vertical hole (24) of this shaft joint (23), and in this state, the shaft (14) is inserted into the slit (18).
Then, the pin (19) is passed through the hole (25) of the shaft (14) to connect the shaft coupling (23) and the shaft (14), and the electric motor (16) is connected.
The rotational force is transmitted to the stirring blade (3). Moreover, the axis (14
) can be moved up and down relative to the bearing, and the slotted throat (18
) is connected to the shaft (14) and the joint case (23) by the pin (19) that passes through the shaft (14).
can move vertically within the operating range of the vertical width of the slit (18).

Now, this operation will be explained below.

The agitation N (3) before the material to be dried (7) is supplied into the drying chamber (2) is positioned downward as shown in FIG. 2 due to its own weight. In this state, the material to be dried (7) is supplied while rotating the stirring blade (3). This is to allow the material to be dried (7) to be deposited flatly without shifting. At this time, the discharge valve (
11) is closed. Then, a certain amount of the material to be dried (
When 7) is supplied, microwave irradiation is performed to start drying. During this drying, the stirring jl (3) is also rotated to raise the moisture generated from the material to be dried (7) near the bottom, and to improve the uneven heating of the material to be dried (7) so that it is evenly heated. Allow it to dry. When the material to be dried (7) is caught in the gap between the rotating stirring blade (3) and the inner wall of the drying chamber (2) during this feeding or drying, the material to be dried (7) may be The stirrer M(3) comes to ride over the material to be dried (7), and the stirrer blade (3) moves upward as shown in FIG. 3 while rotating and rides over the material to be dried (7). Then, the stirring blade (3) returns to the state shown in FIG. 2 and continues rotating while pushing away the material to be dried (7) by its own weight.

As described above, since the stirring blade (3) can be moved up and down, the rotation becomes smooth, which also contributes to reducing the failure rate of the device.

In addition, when cleaning the inside of the drying chamber (2), the stirring blade (3) can be lifted up to clean it, so that the drying object (7) can be cleaned without remaining inside the drying chamber (2) after cleaning. .

(g) Effects By carrying out the present invention, the rotation of the stirring blades will not stop due to being caught on the material to be dried, and thus the reliability of the apparatus will be improved.

[Brief explanation of the drawing]

The drawings relate to a microwave drying device according to an embodiment of the present invention.
The figure is a sectional view, Figure 2 is an enlarged sectional view when the stirring blade is in its normal position, Figure 3 is an enlarged sectional view when the stirring blade is moved upward, and Figure 4 is an enlarged sectional view of the area near the axis of the stirring blade. It is an exploded perspective view. (1) Main body of microwave drying device, (2) Drying chamber, (3) Stirring blade, (14) Shaft, (15
)...Bearing part, (]6)...Electric motor, (17)...
・Shaft case, (18) slit, (19)...pin,
(23)...Shaft coupling.

Claims (1)

[Claims] (1) A drying chamber into which a granular or powdery material to be dried is supplied; a microwave supply means for microwave drying the material to be dried in the drying chamber; 1. A microwave drying apparatus comprising: a stirring means for stirring; and a driving means for rotationally driving the stirring means, wherein the stirring means is attached to the driving means so as to be movable up and down.