JPH04251183A - Microwave-projecting continuous drying device - Google Patents

Abstract

PURPOSE:To project microwave evenly against works to be dried, which pass through a cylindrical body, and contrive the improvement of radio wave efficiency and drying efficiency as well as the securing of safety property of the device by a method wherein the cylindrical body, made of an electric, is rotated in the projecting chamber of microwave. CONSTITUTION:A projecting chamber 4 is formed by considering the configuration and size of a cylindrical body 5 while the supporting device of the cylindrical body 5 is constituted of supporting rings 11, supporting rollers 24, roller supporting shafts, bearings 20 and the like. A supplying device is constituted of a hopper 1, a rotary valve 2 and a chute 3 while a discharging device is constituted of a discharging port 23 and another rotary valve 8. the cylindrical body 5 is rotated by a motor 19, a rotating shaft 26, a chain sprocket 16 and a sprocket 12. On the other hand, the angle of inclination of the projecting chamber 4 is adjusted by a jack bolt 16. A wave guide 6, projecting microwave against the inside of the projecting chamber 4 is arranged in the same chamber 4 considering the mode of ratio wave. According to this method, the cylindrical body 5 is rotated to dry the works (a) to be dried efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a microwave irradiation continuous drying device suitable for drying small pieces of light weight such as tea leaves and plastic pellets.

2. Description of the Related Art Conventionally, as this type of apparatus for continuously drying materials to be dried such as tea leaves by microwave irradiation, there are A, a belt conveyor type B, and a kiln type apparatus using a metal drum.

Problems to be Solved by the Invention The conventional system A has the drawback that the conveyor belt deteriorates in a short period of time, but it also has the disadvantage that it is difficult to process materials to be dried, such as tea leaves, which inherently contain a considerable amount of moisture. In this case, a microwave oscillator with a very high output is used, so if a small piece of metal gets mixed into the material to be dried, it will immediately catch fire, and even the conveyor belt will be burnt out. There were many things that went wrong.

In addition, method B does not have the problem of fires like the belt conveyor method, but it cannot form a good irradiation space for electromagnetic waves and the radio wave mode within the irradiation space is not uniform, resulting in extremely low radio wave efficiency. In reality, there was a problem in that the outer wall of the drum had to be heated with a device such as a gas burner.

An object of the present invention is to obtain a microwave irradiation continuous drying device that has high radio wave efficiency, good drying efficiency, and ensures safety.

Means for Solving the Problems In order to achieve the above objects, the microwave irradiation continuous drying device of the present invention rotatably supports a dielectric cylinder housed laterally within a microwave irradiation chamber. , a device is provided for guiding the material to be dried into the irradiation chamber and feeding it into the cylinder from one opening of the cylinder, and a device for discharging the material to be dried out of the irradiation chamber from the other opening of the cylinder 5. .

The apparatus further includes a device for rotating the cylindrical body and controlling the rotation, and a device for tilting the irradiation chamber so that the drying material discharge side of the irradiation chamber is tilted downward and controlling the angle of inclination.

Function: In the apparatus of the present invention configured as described above, the material to be dried is
The material to be dried in the cylinder is supplied in a fluid form from the supply device through one opening of the cylinder housed in the irradiation chamber, and the material to be dried in the cylinder is supplied in a fluid state by the inclination of the irradiation chamber, in which the discharge side of the material to be dried in the irradiation chamber is tilted downward. passes through the cylindrical body in a fluid state toward the other opening of the cylindrical body, and during the passage, rotation is applied to the cylindrical body by the rotating device. As a result, the material to be dried inside the cylinder spreads in the circumferential direction while changing its position in the circumferential direction, and passes through the cylinder while changing its posture.
Microwaves are efficiently irradiated and each object to be dried is irradiated evenly.

The material to be dried that has been subjected to the microwave irradiation drying process in this manner is discharged to the outside of the irradiation chamber from the other opening of the cylinder.

By controlling the rotation speed of the cylinder and the inclination angle of the irradiation chamber, the time during which the material to be dried passes through the cylinder is adjusted, and by controlling the passage time and the output of the microwave, the heating temperature of the material to be dried can be maintained at an optimal constant level. I try to keep it at that temperature.

Embodiment To explain the embodiment with reference to the drawings, the microwave irradiation chamber 4 has a good irradiation space in consideration of the shape and size of the cylinder 5 accommodated laterally within the irradiation chamber 4. formed to form. The cylindrical body 5 is made of a dielectric material such as ceramic and has a circular or polygonal cross section, and is rotatably supported within the irradiation chamber 4 . The support device includes a support ring 11, a support roller 24, a roller support shaft, and a bearing 2.
It is composed of 0, etc. Consisting of a hopper 1, a rotary valve 2, and a chute 3, the tip of the chute 3 is inserted into one opening 21 of a cylinder 5 in the irradiation chamber 4, so that the material to be dried is flowed into the cylinder 5. It constitutes a supply device.

The other opening 2 of the cylindrical body 5 is opened by an outlet 23 formed in the irradiation chamber 4 and a rotary valve 8 connected to the outlet 23.
This constitutes a device for discharging the material to be dried flowing down from the irradiation chamber 4 to the outside of the irradiation chamber 4. Reference numeral 9 indicates an outlet for the dried material to the outside.

The rotary valves 2 and 8 in each of these devices function to supply and discharge while preventing leakage of electromagnetic waves.

The cylindrical body 5 is rotated by a motor 19, a rotating shaft 26, a chain sprocket (or gear) 18, and a sprocket 12, and the rotation of the cylindrical body 5 is controlled by controlling the rotation of the motor 19.

A jack bolt 16 is brought into contact with the bottom wall of the irradiation chamber 4 on the supply side of the material to be dried, and as the jack bolt 16 is extended, the material discharge side of the irradiation chamber 4 is tilted downward, and depending on the degree of extension of the jack bolt 16, It constitutes a device that controls the angle of inclination.

A waveguide 6 for irradiating microwaves into the irradiation chamber 4 is provided at a position in the irradiation chamber 4 in consideration of the radio wave mode.

7 indicates a microwave oscillator.

Reference numeral 10 denotes a temperature sensor, which measures the temperature of the material to be dried a after heat treatment to check the heating temperature of the material to be dried. Note that 13 is a stirrer, 14 is an exhaust fan, 15 is a spill stopper, and 17 is an inspection window.

Effects of the Invention Since the present invention is configured as described above, it produces the effects described below.

As the cylindrical body rotates, the objects to be dried spread out in the circumferential direction while changing their positions in the circumferential direction, and pass through the cylindrical body while changing their posture, so that they are efficiently irradiated with microwaves, and each Since the objects to be dried are irradiated evenly, the radio wave efficiency is high, the drying efficiency is good, and each object to be dried can be heated and dried evenly.

Since the object to be dried is continuously dried by passing through a cylinder made of dielectric material such as ceramic, there is no occurrence of fire and the work is always safe.

[Brief explanation of the drawing]

The drawing is a schematic front view showing the device of the present invention. 1...Hopper 2...Rotary valve 3...Chute 4
…Irradiation chamber 5…Cylinder 6…Waveguide 7…Microwave oscillator 8…Rotary valve 10…Temperature sensor 11…Supporting ring 15…Spill prevention 1
6...Jack bolt 18...Chain sprocket 19
...Motor 20...Bearing 21...One opening 22 of the cylinder
...Other opening of the cylindrical body 23...Discharge port 24...Support roller a...To be dried

Claims (1)

[Claims] Claim 1: A dielectric cylinder 5 housed laterally in a microwave irradiation chamber 4 is rotatably supported, and a material to be dried (a) is guided into the irradiation chamber 4 and the cylinder 5 is Devices 1, 2, 3 for feeding into the cylinder 5 from one opening 21, and the other opening 2 of the cylinder 5
Devices 23 and 8 for discharging the material to be dried from 2 to the outside of the irradiation chamber 4
A device 19 for rotating the cylindrical body 5 and controlling the rotation, and a device 16 for tilting the irradiation chamber 4 so that the dried material discharge side of the irradiation chamber 4 is tilted downward and controlling the angle of inclination. A microwave irradiation continuous drying device characterized by having: