JPH0765848B2 - Microwave dryer - Google Patents

Description

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

(B) Conventional technology In Japanese Patent Application No. 1-127336 (Japanese Patent Laid-Open No. 2-305607), a microwave is supplied to a drying chamber in which a granular or powdery material to be dried is supplied. A microwave drying device for drying is disclosed. In this case, the drying chamber has an opening at the top, and this opening is opened and closed by a door that moves up and down.

It should be noted that in such a microwave drying apparatus, microwaves are supplied when the door is opened, and microwaves undesirably leak from the drying chamber.

(C) Problems to be Solved by the Invention The present invention suppresses the microwave leakage from a drying chamber that has an upper opening and is opened and closed by a door that moves up and down, thereby improving safety. It is intended to provide a drying device.

(D) Means for Solving the Problems A microwave drying control device of the present invention has an upper opening,
The drying chamber to which the granular or powdery material to be dried is supplied, and after moving upward to the first position immediately above the upper opening, by horizontally moving from the first position to the second position in the horizontal direction, A door that opens an upper opening and is closed by a reverse operation, a door opening / closing mechanism that allows the door to move up and down and also allows horizontal movement, and the door when the lowering operation of the door by the door opening / closing mechanism is completed. A first door switch which is turned on by an opening / closing mechanism, a second door switch which is provided on the peripheral edge of the upper opening and is turned on only when the door is moved downward from the first position, the first door switch and the second door switch.
A microwave supply means for supplying a microwave for drying the dried material into the drying chamber when both door switches are turned on.

(E) Action That is, only the first door switch that is turned on at the end of the door downward movement operation by the door opening / closing mechanism that moves the door at the upper opening of the drying chamber up and down, and only when it moves down from the first position immediately above the upper opening A second door switch installed on the periphery of the upper opening that is turned on enables the microwave supply operation of the microwave supply means when both the first door switch and the second door switch are turned on.

The above-mentioned opening of the door is completed by moving the door upward and moving up to the first position, and then horizontally moving to the second position. When the door is closed, the reverse operation is performed. This is completed by turning on the door switch and the second door switch.

If the door is not moved horizontally to the first position and moved downward by the door opening / closing mechanism when the door is closed, the second door switch does not turn on, and when the door is opened, the user accidentally touches the second door switch. If it does, the microwave supply means does not operate because the first door switch does not turn on, and microwave leakage from the drying chamber can be prevented.

(F) Embodiment The drawings show the structure of the microwave drying apparatus of the embodiment of the present invention.

The microwave drying apparatus main body 1 has, as a main part, a cylindrical drying chamber 3 having a vertically moving door 2 for the opening.
The door 2 is connected to the vicinity of the handle 5 via the arm 4 and moves up and down by operating the handle to open and close the upper opening of the drying chamber 3. Details of the opening / closing structure of the door 2 will be described later. A granular or powdery material to be dried is appropriately supplied to the drying chamber 3, and the material to be dried is microwave-dried while being stirred by the stirrer 6 in the drying chamber 3 and then appropriately discharged from the discharge gate 7. It Examples of the material to be dried include resin pellets, rice, chemical powder and the like. The resin pellets are molded after being melted, but if the resin pellets are dried prior to this melt molding, the subsequent molding will be well performed. In this embodiment, resin pellets are selected as the dried product.

A magnetron 9 is fixed to the door 2 of the drying chamber 3 via a waveguide 8, and the material to be dried in the drying chamber 3 is dried by microwaves from the magnetron.
A cooling fan 10 for cooling the magnetron 9 is also fixed to the door 2.

The microwave drying device main body 1 has a mounting base on the front side.
A control parts box 12 is fixed via 11 and a keyboard 13 for giving an instruction regarding microwave drying in the drying chamber 3 is exposed in the front of the main body 1 so that the control parts box 12 It is arranged on one side of the front side of the to open and close via hinges 14 and 14. The above hinge 1 around this keyboard 13
4, 14 and the like are covered by a panel frame 16 which is detachably attached to the front wall of the main body 1 with screws 15, 15. Then, on the back side of the keyboard 13 through spacers 17, 17 ...
Two control boards 18, 18 are mounted. This control board 1
8 and 18 are equipped with a control unit, such as a microcomputer, which controls the drive of the magnetron 9 based on an instruction from the keyboard 13 and executes and controls the microwave drying in the drying chamber 3.

The opening / closing structure of the door 2 will be described with reference to FIGS. 3 and 4 in particular. A bearing 19 is fixed to the side wall of the drying chamber 3, and the bearing 19 has an upper diameter large portion 20 and A through hole composed of the lower diameter small portion 21 is formed. The inner surface of the lower small diameter portion 21 is threaded. On the other hand, a screw shaft 23 having an upper handle 5 at the upper portion and a screw portion 22 at the lower portion is provided, and the screw portion 22 at the lower portion of the screw shaft 23 is screwed into the lower diameter small portion 21. A pipe shaft 25 is supported on the screw shaft 23 by a bearing portion 24 fixed to the screw shaft 23, whereby the pipe shaft 25 is rotatable with respect to the screw shaft 23. The lower portion of the pipe shaft 25 reaches the inside of the upper diameter large portion 20. And the pipe shaft 25
The arm 4 is fixed to the upper end of the door 4, and the upper surface of the door 2 is fixed to the tip of the arm 4. The door 2 is connected to the vicinity of the handle 5 via the arm 4. Here, the handle 5, the arm 4, the bearing 19,
The screw shaft 23, the bearing portion 24, the pipe shaft 25, and the like constitute a door opening / closing mechanism that moves the door 2 up and down. Furthermore,
There is a first portion just below the screw portion 22 of the screw shaft 23 of the door opening / closing mechanism.
A door switch 26 is installed, and the first door switch is turned on when the downward movement operation of the door 2 is completed by the screw shaft 23, and is turned off otherwise. A second door switch 27 is installed on the periphery of the upper opening of the drying chamber 3.

When opening the door 2, the handle 5 is first rotated counterclockwise (FIG. 4). Then, based on the screwing relationship between the screw portion 22 and the lower diameter small portion 21, the screw shaft 23
Moves upward while rotating, and the bearing portion 24 accordingly urges the pipe shaft 25 upward, so that the pipe shaft 25 also moves upward, and thus the pipe shaft 25 is connected to the pipe shaft 25 via the arm 4. The opening door 2 moves upward to a position (first position) immediately above the upper opening. Thereafter, the door 2 is manually operated to rotate the pipe shaft 25 with respect to the screw shaft 23 to horizontally move the door 2 to the position (second position) indicated by the broken line in FIG. Is completed and the upper opening of the drying chamber 3 is opened.

At this time, the first door switch 26 is in the OFF state (predetermined state) without being turned on by the screw portion 22 of the screw shaft 23 because the screw shaft 23 moves upward, and the second door switch 27 is set in the door 2
Similarly, the magnetron 9 is not turned on at the peripheral edge thereof and is turned off, which disables the microwave supply drive of the magnetron 9. Moreover, since the first door switch 26 is interlocked with the screw shaft 23 of the door opening / closing mechanism and is operated only by the screw shaft 23 of the door opening / closing mechanism, it cannot be operated undesirably and the door is opened. Occasionally, the predetermined OFF state is not achieved, and microwave leakage from the drying chamber is significantly suppressed when the door is opened. Incidentally, the second door switch
When the door is opened, the movable portion 28 may turn on undesirably because the movable portion 28 projects from the peripheral edge of the drying chamber 3 and can be easily touched.

When the door 2 is opened as described above, the stirring member 6 can be easily removed, and the drying chamber 3 can be cleaned very easily. In the closing operation of the door 2, the work reverse to the above may be performed.

(G) Effect of the Invention According to the present invention, it is possible to prevent microwaves from leaking from a drying chamber that has an upper opening and is opened and closed by a door that moves up and down, and has a high safety. Can be provided.

[Brief description of drawings]

The drawings relate to a microwave drying apparatus according to an embodiment of the present invention.
The drawing is a front view, FIG. 2 is a side sectional view, FIGS. 3 and 4 are side sectional views and a plan view near the door, respectively, and FIG. 5 is a planar sectional view near the keyboard. 2 ... Door, 3 ... Drying room, 4 ... Arm, 5 ... Handle, 9 ... Magnetron, 19 ... Bearing, 23 ... Screw shaft, 24 ... Bearing part, 25 ... Pipe shaft, 26 …… First door switch.

Claims (1)

[Claims] 1. A drying chamber having an upper opening to which a granular or powdery material to be dried is supplied, and after moving upward to a first position directly above the upper opening, a horizontal direction from the first position. The upper opening is opened by horizontally moving to the second position,
A door that is closed by a reverse operation; a door opening / closing mechanism that allows the door to move up and down and also allows horizontal movement; and a door opening / closing mechanism that is turned on when the downward movement operation of the door by the door opening / closing mechanism is completed. One-door switch,
A second door switch provided on the peripheral edge of the upper opening that is turned on only when the door is moved downward from the first position, and inside the drying chamber when both the first door switch and the second door switch are turned on. A microwave drying device comprising: a microwave supply unit that supplies a microwave for drying the material to be dried.