JPH0742159B2 - drying furnace - Google Patents

Description

Detailed Description of the Invention

[0001]

[Field of Industrial Application] The present invention is applied to dry roof tiles, which are ceramic products.
The present invention relates to a drying furnace designed to optimize drying conditions .

[0002]

2. Description of the Related Art Conventionally, when drying roof tiles and the like of ceramic products, a conveyor is provided which conveys the waste land after press molding in a collapsed state, and the conveyor is connected in series with a drying furnace using only hot air as a heat source in tunnel form. Even though they are arranged continuously and are transported through the wasteland one after another, the hot air directly contacts the surface of the wasteland with such a means, so that the area near the surface dries faster than the central part There is a significant difference in the speed, which causes uneven shrinkage, which causes cracks and breaks on the surface due to drying, and the imbalance of shrinkage tends to cause distortion, resulting in poor yield. It was the current situation that it was made gentle and usually dried over 24 hours.

In addition, depending on the type of roof tile, if the hot roof lodging cannot be dried, a separate drying furnace is required and the equipment cost rises. It had a drawback that could not be addressed.

[0004]

DISCLOSURE OF THE INVENTION In the present invention, when drying,
Of microwave in a tunnel type microwave drying oven
In addition to aiming for utilization, the drying rate of internal diffusion and surface evaporation is uniformly controlled to eliminate the imbalance of shrinkage due to the difference in drying rate to improve the product yield, and to accelerate the drying rate in a few hours. The purpose of the present invention is to provide a drying oven that enables the drying of.

[0005]

SUMMARY OF THE INVENTION In view of the problems such as the production yield based on the above-mentioned prior art, the present invention is particularly suitable for tunnel-shaped masks.
Microwave at the entrance and exit of the microwave drying furnace to wasteland
The microwave is used while being effectively absorbed and absorbed.
A drying furnace body, a far infrared ray drying furnace body, and a hot air drying furnace body are sequentially arranged.
The purpose of this is to provide a drying furnace whose purpose is to optimize the dry condition by eliminating the above-mentioned drawbacks.

[0006] Then , tons are sequentially transferred from the upstream side of the transfer path of the transfer conveyor which transfers the pallets on which the roof tiles are placed in a flat shape.
Microwave drying using a microwave formed in a flannel as a heat source
Drying furnace body, far infrared ray drying furnace body using far infrared rays as a heat source, hot air
A hot-air drying furnace body using
The auxiliary furnace body is continuously formed from the opening of the entrance of the drying furnace body,
Completely hide at least one wasteland of the auxiliary furnace body.
It is set so that

[0007]

In the present invention, the microwave drying oven body is assisted.
A mike trying to leak to the outside in the wasteland underway inside the furnace
Pre As absorbs filtered, and rough terrain will increase the speed of the internal diffusion of water in the center of wasteland warmed by microwave
After heating, the heat transfer speed is further increased by the radiant energy of far infrared rays to uniformly heat the surface evaporation.
After that, it is dried by surface evaporation with hot air.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings, in which 1 is a drying furnace according to the present invention, and the drying furnace 1 has a first conveying path 2 and a second conveying path which are located above and below. A transport conveyor 4 constituting the path 3 is arranged, and a hot air drying furnace body 5 made of a heat insulating material and having a tunnel-like hot air as a heat source, and a far infrared ray drying furnace body having a far infrared ray as a heat source are provided. 6. A microwave drying furnace body 7 having a microwave as a heat source is arranged in the transport paths 2 and 3.

Regarding the basic arrangement of the hot-air drying furnace body 5, the far-infrared ray drying furnace body 6, and the microwave drying furnace body 7, the microwave drying furnace body 7 is located upstream of the first conveying path 2. The far-infrared ray drying furnace body 6 is disposed on the downstream side of the first transport path 2 and the hot air drying furnace body 5 is disposed on the second transport path 3.

Further , the microwave drying furnace body 7 has a central portion
The main furnace body 8 is made of a material that blocks microwaves.
The inside of the main furnace body 8 is appropriately irradiated with microwaves.
The microwave transmitters 9 and 9a are installed.

The opening 1 at the entrance and exit of the end of the main furnace body 8
Depending on the material that blocks microwaves more than 0 and 10a
The auxiliary furnace bodies 11 and 11a are continuously formed.

The furnace length L of the auxiliary furnace bodies 11, 11a is such that at least one waste land W placed on the pallets 31, 31a, which will be described later, is completely hidden in the auxiliary furnace bodies 11, 11a. It is set.

In the present embodiment, the transport paths 2 and 3 are formed in two upper and lower stages, but may be formed in one stage or a plurality of stages of three or more stages.

In the figure, reference numeral 12 is a hot air feeder disposed at an appropriate position of the hot air drying furnace body 5, and reference numeral 13 is a far infrared heater disposed at an appropriate position of the far infrared drying furnace body 6.

The transfer conveyor 4 has rotating bodies 15, 15 such as sprockets at both upper and lower ends of the conveyor frame 14.
A is pivotally supported, endless chains 16, 16a are wound around the rotating bodies 15, 15a, and the chains 16, 16a are circulated by the operation of the drive units 17, 17a to circulate and drive the first conveying path 2 And the 2nd conveyance path 3 is comprised.

Reference numeral 18 denotes an elevating device which connects the exit side of the first conveying path 2 and the entrance side of the second conveying path 3 to each other.
Is a guide shaft 20 which is vertically installed on a substantially L-shaped frame 19,
A pair of left and right raising and lowering arms 21 are extended to the end of the conveyor 4 and slidably mounted on 20a, a cylinder 22 is connected to the base of the raising and lowering arm 21, and the raising and lowering arm 21 is raised and lowered by the operation of the cylinder 22. Have control.

Further, rotating bodies 23, 23a such as sprockets are pivotally supported at the front and rear ends of the lifting arm 21, and an endless chain 24 is wound around the rotating bodies 23, 23a, and the drive section 25 is operated to circulate the chain 24. is doing.

Next, the operation of the drying furnace according to the present invention will be described.
27, 27a ... Formed on the legs 28, 28a on the inside of the displacement preventing projections 27, 27a ... And on the mounting portions 29, 29a corresponding to the shapes of roof tiles (Japanese type, flat plate, S type, etc.). The rooftop W after the completion of the press molding is placed on the pallets 31, 31a, ... on which the roof tile holder 30 formed with the pallet is replaceably mounted, and the pallets 31, 31a ... are placed above the entrance of the first transport path 2. While being carried in from the side and conveyed to the exit side, it is first dried by the microwave drying furnace body 7 and the far infrared ray drying furnace body 6 and transferred onto the elevating arm 21 of the elevating device 18 which has been previously elevated from the exit side.

For such primary drying, the water in the central portion of the wasteland W is heated by microwaves so as to be preheated so as to increase the speed of internal diffusion, and the heat transfer speed is further increased by the radiant energy of far infrared rays. Then, the outputs of microwaves and far-infrared rays are adjusted and controlled in accordance with the type of roof tile (shape, wall thickness, etc.) so as to uniformly heat the surface in correspondence with surface evaporation.

While the elevating arm 21 is lowered to carry the pallets 31, 31a on the elevating arm 21 from the inlet side of the hot air drying furnace body 5 of the second conveying path 3 below and to the outlet side. The rough land W is secondarily dried by the hot air drying furnace body 5.

In the secondary drying, the surface of the waste land W uniformly heated by the primary drying is mainly evaporated.

Further, it is located inside the main furnace body 8 during the course of the wasteland W passing through the auxiliary furnace body 11 on the inlet side of the microwave drying furnace body 7, the main furnace body 8 and the auxiliary furnace body 11a on the outlet side. The waste land W is irradiated with microwaves from the microwave transmitters 9 and 9a.

Therefore, most of the microwaves are absorbed and heated in the wasteland W inside the main furnace body 8, but the microwaves that are reflected inside the main furnace body 8 or cannot be absorbed in the wasteland W are auxiliary. Although it progresses into the furnace bodies 11 and 11a, the auxiliary furnace body 1
Since the wasteland W containing water is located in the auxiliary furnace bodies 1 and 11a, the auxiliary furnace bodies 11 and 11a can be moved while the auxiliary furnace bodies 11 and 11a are in progress.
Microwaves that are about to leak to the outside can be absorbed by the wasteland W and can be prevented from leaking to the outside.

Therefore, the door that can be opened and closed at the entrance and exit of the furnace, the sensor for intermittent control, and the control device can be completely eliminated, and simplification can be achieved, and continuous transportation can be achieved. The microwave can be effectively used, and the time required for heating to a predetermined temperature can be significantly shortened, which is also effective as an energy saving measure.

Further, the plates as the pallets 31, 31a ...
Since the roof tile support 30 corresponding to various roof tiles is freely replaceable on the 26, the setup can be extremely facilitated during the production of a large number of small-lot types.

[0026]

In summary, according to the present invention, the conveyor 4 for conveying the pallets 29, 29a ... On which the roof tiles W are placed in an inverted shape.
Tunnels are formed sequentially from the upstream side of the transport paths 2 and 3.
Microwave oven 7 using microwave as a heat source, far red
Far-infrared ray drying furnace body 6 that uses an outside wire as a heat source, and uses hot air as a heat source
Since the hot air drying furnace body 5 is installed,
Increases the rate of internal diffusion by heating the moisture in the center of the wasteland
Radiant energy by far infrared rays after preheating
Heat transfer speed is further increased to correspond to surface evaporation and uniform
And then dried by surface evaporation with hot air.
Therefore, the difference in drying rate between internal diffusion and surface evaporation is
The product yield is improved by eliminating the imbalance of shrinkage due to differences
The microwave and far infrared rays can be improved in the furnace.
It can be dried without being affected by the relative humidity of
In addition, it shortens the drying time and supports small-lot, high-mix, quick-delivery production.
Can be made.

Further, the opening of the entrance and exit of the microwave drying furnace body 7
Auxiliary furnace bodies 11 and 11a are continuously formed from parts 10 and 10a
However, the furnace length L of the auxiliary furnace bodies 11 and 11a is set to
Since it was set to hide at least 1 or more completely, auxiliary furnace
Leaking the bodies 11 and 11a to the outside by the ongoing wasteland W
The effective use of microwaves
And the time required to heat to the specified temperature is shortened.
Microphone that can be compressed and can be opened and closed freely at the entrance and exit of the furnace
(B) For the door to shut off the wave and the intermittent opening / closing control of the door
The structure of the furnace body itself can be simplified without the need for sensors and control devices.
It can be digested, etc. Its practical effect is enormous.
Is.

[Brief description of drawings]

FIG. 1 is a side view of a drying furnace according to the present invention.

FIG. 2 is a sectional view of a main part of a microwave drying oven body in a drying oven.

FIG. 3 is a plan view of a transfer conveyor in a drying furnace.

FIG. 4 is an exploded perspective view of a pallet.

[Explanation of symbols]

 2 Transport path 3 Transport path 4 Transport conveyor 5 Hot air drying furnace body 6 Far infrared drying furnace body 7 Microwave drying furnace body 31, 31a ... Pallet

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-3-285861 (JP, A) JP-A-46-177 (JP, A) JP-A-50-97610 (JP, A)

Claims (1)

[Claims] 1. A tunnel-like structure from the upstream side of a transfer path of a transfer conveyor that transfers a pallet on which roof tiles are placed in an inverted shape.
Microwave Drying Furnace Using Microwaves Formed on the Surface as a Heat Source
Body, far-infrared drying furnace body that uses far-infrared as a heat source, heat hot air
The hot-air drying furnace body serving as the source is provided, and the microwave drying furnace
Auxiliary furnace body is continuously formed from the opening of the entrance of the body,
Completely hide at least one wasteland from the length of the furnace body
A drying oven characterized by the above settings .