JPH04177082A - Microwave drier - Google Patents

Abstract

PURPOSE:To recognize a heating state or a heat insulating state at a glance and to smoothly perform the preparation of the following work by providing display means for displaying a temperature sensed by temperature sensing means until it reaches a temperature lower by a predetermined temperature than a set temperature and displaying, when reaching the temperature, the set temperature. CONSTITUTION:An operation unit 24 has a temperature display unit 29 for displaying a set temperature and an actually measured temperature, a proceeding state display unit 30 for displaying a present proceeding state, etc. After a drying temperature set start key 34 is first pressed, a set temperature is input by a number key 31. When a start key 39 is pressed, a drying operation is started. In drying steps, whether the temperature sensed by a temperature sensor 17 reaches within + or -2 deg.C of the set temperature or not is first judged, and the temperature sensed by the sensor 17 is, if it does not reach the set temperature, displayed by the unit 29. If it reaches within + or -2 deg.C, the displaying temperature of the unit 29 is switched to the set temperature. Then, whether a heating flag is stood or not is judged. According to this device, whether it is a heating operation or a heat insulating operation can be identified to improve using operability.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a microwave drying apparatus that supplies microwaves to a material to be dried to dry it.

(b) Conventional technology Conventionally, this type of microwave drying equipment
It is disclosed in Publication No. 18. This device drives and controls a microwave oscillator using a microwave output drive device based on the results of a temperature detection means installed inside the heating machine body.

(c) Problems to be Solved by the Invention In the conventional example described above, the temperature displayed on the temperature display section is normally the temperature detected by the temperature detection means, so even if the temperature is kept warm, microwave noise etc. Therefore, the current temperature detected by the temperature detection means displayed on the display is not stable and constantly fluctuates.

(d) Means for Solving the Problems The means of the present invention for solving the problems comprises a drying chamber, a supply means for supplying the drying material to the drying chamber, and the drying material supplied into the drying chamber. a microwave supply means for supplying microwaves to an object; a temperature detection means for detecting the temperature of the object to be dried; a temperature setting means for setting a drying temperature of the object to be dried; until the temperature reaches a predetermined value lower than the temperature set by the temperature setting means, the temperature detected by the temperature detection means is displayed, and after reaching the temperature, the temperature set by the temperature setting means is displayed. It consists of display means.

(e) Operation The temperature detected by the temperature detection means is displayed until the temperature reaches a predetermined value lower than the set temperature, and once it reaches the set temperature, the heating status and keeping warm status can be seen at a glance, and subsequent work can be done. Set-up can be done smoothly.

(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 l and peripheral mechanisms.

The main part of the drying apparatus 1 is provided with a cylindrical drying chamber 3 having an upper lid 2 which 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 reaches into a storage tank 6 in which granular or powdery material 5 to be dried is stored. This storage tank 6 is provided for each type of material to be dried, and when changing the material to be dried, the supply pipe 4 is replaced with the storage tank 6 in which the material to be dried is stored. Examples of the material to be dried 5 include resin pellets, powdered chemicals, and the like. Resin pellets are molded after being melted, and if the resin pellets are dried prior to such melt molding, subsequent molding will be better. In this embodiment, resin pellets are 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 5. 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 suction hopper 7, and a poppet valve 9 is provided above the filter paper 8. There is. and,
In the poppet valve 9, a suction blower 11 is connected to the suction hopper 7 via an intake pipe 10. In this case, when the blower 11 is driven with the poppet valve 9 open, the suction action of the blower 1 extends to the supply pipe 4 via the intake pipe 10, suction hopper 7 and drying chamber 3, and When the material to be dried 5 in the storage tank 6 passes through the supply pipe 4 and reaches the drying chamber 3, it falls under its own weight and accumulates in the drying chamber.

Here, the above-described supply pipe 4, suction hopper 7, suction pipe 10, and blower 11 constitute a supply device that supplies the material to be dried 5 to the drying chamber 3.

Is there a microwave supply means inside the drying chamber 3? Microwaves are supplied from the tanetron 12 through a waveguide 13, and a stirring body 15 that is driven by a motor I4 and stirs the material to be dried 5 is provided on the bottom wall. A level sensor 16 and a detection section I7 of temperature detection means are arranged on the side wall of the drying chamber 3. Such level sensor 1
6 detects whether a predetermined amount of the material to be dried 5 has accumulated in the drying chamber 3, and the temperature detection s17 detects the temperature of the material to be dried 5. Further, a compressor 19 is connected to the left bottom part of the drying chamber 3 via an intake valve 18, and the upper lid 2 of the drying chamber 3
An exhaust valve 20 is provided. These compressors 1
9 and 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 water vapor generated during drying passes through the exhaust valve 20 together with the air from the compressor 19 to the outside. is discharged to. Further, a piston discharge valve 21 serving as a discharge device is located at the bottom right of the drying chamber 3.
is provided. The discharge valve 21 is driven to open when the dried material 5 is discharged, and the dried material 5 falls into the preliminary chamber 22 and accumulates therein.

FIG. 2 is a control block diagram of the microwave drying apparatus of the present invention. In addition, parts with the same numbers as above are
Since they are the same, the explanation will be omitted.

A memory 23 stores the temperature set for drying the object to be dried.

Reference numeral 24 denotes an operating section of the main body 1 of the microwave drying apparatus, the details of which are shown in FIG.

25 is a control unit that sequentially outputs operation commands for the microwave drying device.

The operation section 24 includes an automatic operation setting operation section 26 that automatically sets and starts the drying operation, a manual operation section 27 that arbitrarily operates the motor 14, etc., a time display section 28 that displays the operation time, and a set temperature and an actual measured temperature. Temperature display section 29 that displays
, a progress status display section 30 that displays the current progress status.

The automatic operation setting operation section 26 includes numeric keys 31 for inputting a set temperature, an automatic operation permission switch 32 for permitting automatic operation if the switch is turned on, a drying time setting start key 33, and a drying temperature setting start key 34. , a transport time setting start key 35, a transport correction time setting start key 36, a standby time setting start key 37, a setting end key 38, and a start key 39 for starting automatic operation.

The operation of the apparatus of the present invention will be explained based on Section 4'.

First, the process waits until the drying temperature setting start key 34 is pressed or the start key 39 is pressed.

At this time, if the start key 39 is pressed, the previous driving details are automatically set and the drying operation is started.

First, the setting operation will be explained. Drying temperature setting start key 34
After pressing , the set temperature is input using the numeric keys 31.

Then, by pressing the setting end key 38, the setting operation is ended. At this time, it is determined whether the set number is a valid number or not, and if the set temperature is canceled, the setting is invalidated. If the number is valid, the set temperature is stored in the memory 24 and the temperature is kept on standby until the start key 39 is pressed.

When the start key 39 is pressed, the drying operation starts.

First, a material input step is performed in which the material to be dried 5 is supplied into the drying chamber 3, and then a drying step is started.

In this drying process, first, it is determined whether the temperature detected by the temperature detection unit 17 has reached within ±2°C of the set temperature. display the temperature. If the temperature reaches within ±2°C, the displayed temperature on the temperature display section 29 is switched to the set temperature. Next, determine whether the heating flag is set. This heating flag is set when heating is in progress, and goes off when heating is stopped. Therefore, since the heating flag is not initially set, it is determined whether the temperature detected by the temperature detection section 17 has reached the set temperature +1°C, and if it has not reached the set temperature, the heating operation is started and the heating flag is set.

Thereafter, the heating operation progresses, and when the set temperature reaches +1° C., the heating operation is stopped and the heating flag is reset at the same time. As time passes, the temperature of the material to be dried decreases by 1
When the temperature detected by the temperature detection unit 17 reaches ℃, the heating operation is started again.

The above-mentioned operation is repeated for a predetermined period of time to complete the drying process, and the process moves on to the discharge process of the material to be dried 5, and the material to be dried 5 is transferred to the reserve tank 2.
2, and the drying operation is completed.

(G) Effects of the Invention According to the present invention, it is possible to identify whether the heating operation is in progress or the heat retention operation is in progress.
This improves usability.

[Brief explanation of the drawing]

All the drawings show embodiments of the present invention; Fig. 1 is an overall configuration diagram, Fig. 2 is a lock diagram of the control unit, Fig. 3 is a front view of the operating unit, and Fig. 4 is an operation flowchart. show. 1...Microwave drying device, 17...Temperature detection unit,
28...Temperature display section

Claims (1)

[Claims] (1) A drying chamber, a supply means for supplying a material to be dried to the drying chamber, a microwave supply means for supplying microwaves to the material to be dried supplied into the drying chamber, and a temperature of the material to be dried. temperature detection means for detecting the drying temperature of the drying material; temperature setting means for setting the drying temperature of the material to be dried; and at least the temperature detected by the temperature detection means reaches a temperature lower by a predetermined value than the temperature set by the temperature setting means. A microwave drying apparatus characterized by comprising display means for displaying the temperature detected by the temperature detecting means until reaching the temperature, and displaying the temperature set by the temperature setting means after reaching the temperature.