JPH0748035B2 - drying furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] Field of Industrial Application The present invention relates to a drying oven with improved drying efficiency for ceramic products such as flat roof tiles.

2. Description of the Related Art Conventionally, as a drying device for ceramic products such as roof tiles, a tunnel dryer is generally used, and a trolley carrying several hundred roof tiles is moved and dried in such a drying furnace. Since it is a continuous furnace that is a series of processes from preliminary drying to main drying, it has the drawback of a long furnace length and a large installation space, and since several hundred tiles are loaded on the truck, the entrance In addition, heat loss occurs due to the large opening area at the exit when putting in and out, and in order to make the contact with dry air uniform, cross-flow, spiral flow, circulation flow, etc. depending on the tile shape and loading method. Although the flow is decided, it is suitable for mass production with the same shape and the same loading method, but it cannot handle high-mix low-volume production, and since the device for forming the flow is installed, the reactor internal structure becomes complicated. Had the drawback that

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention utilizes the heat energy of the main drying chamber to save the heat energy required for drying in the preliminary drying chamber, reduces the installation space, and greatly shortens the drying time. The purpose is to provide a drying oven that has been made possible.

[Structure of Invention]

Means for Solving the Problems In view of the above problems, the present invention forms a furnace body in a tunnel shape with an outer wall made of a heat insulating material, an upper stage portion of the furnace body is a preliminary drying chamber by radiant heat, and a lower stage portion is a heating medium. The main drying chamber is divided by a partition wall made of a metal having thermal conductivity so that the pre-drying chamber and the main drying chamber are a large number of pallets that lay down a white tile roof in multiple rows and columns. A transfer furnace that supports movably is provided in multiple layers, on the other hand, on the start side of the preliminary drying chamber,
An inlet lifter for pushing a pallet into each layer of the preliminary drying chamber is provided, and an outlet lifter for receiving a pallet extruded from each layer of the main drying chamber is provided at the end side of the main drying chamber. Also, on the terminal side of the preliminary drying chamber and the starting side of the main drying chamber, the pallets extruded from the layers on the terminal side of the preliminary drying chamber are received, and the pallets are pushed into the layers on the starting side of the main drying chamber and carried in. An intermediate lifter is provided, and each lifter is provided with a movable body which can be raised and lowered in front of the start side and the end side of the pre-drying chamber and the main drying chamber, and a circulatory driven conveyor for placing a pallet on the moving body. The above-mentioned drawbacks are not solved by providing a drying oven provided with a pallet pressing portion which is provided and provided on the conveyors of the inlet and outlet lifters in conjunction with the driving direction thereof.

Effect In the present invention, the pallet on which the white background is placed is carried into the inlet lifter, and the pallet is sequentially pushed into each layer on the starting end side of the preliminary drying chamber by the inlet lifter to carry it in, thereby terminating the preliminary drying chamber. From the side, the pallet on which the white background, which has been pre-dried, is placed is pushed out to the intermediate lifter waiting in the same layer as above and carried in and received.

In the drying of the preliminary drying chamber, the heat energy of the main drying chamber is conducted through the partition wall, so that the radiant heat from the partition wall can be used, and thus the synergistic action with the radiant heat of the heating device provided in the preliminary drying chamber is achieved. The temperature inside the preliminary drying chamber is raised to dry.

Next, when replacing the pallet from the preliminary drying chamber to the main drying chamber, the pallet is sequentially pushed in from each layer on the starting end side of the main drying chamber by the intermediate lifter to carry in the hot air, which is dry air from the end side of the main drying chamber. The pallet on which the white background which has been dried by contacting with the above is placed is pushed out to the exit lifter waiting in the same layer as the above and is received and received.

EXAMPLE An example of the present invention will be described below with reference to the drawings. 1 is a drying oven, and the drying oven 1 is an outer wall 2 made of a heat insulating material.
To form the furnace body 3 in a tunnel shape, and to form the pre-drying chamber 4 at the upper stage and the main drying chamber 5 at the lower stage in the furnace body 3,
It is divided by a partition wall 6 made of a metal having thermal conductivity, and the furnace length of the main drying chamber 5 is made shorter than that of the preliminary drying chamber 4.

Further, the preliminary drying chamber 4 is dried by radiant heat by an appropriate heating device (not shown), while the main drying chamber 5 is dried by hot air which is dry air by an appropriate heating device (not shown). There is.

Reference numerals 7 and 7a are transfer paths provided in the furnace body 3, and the transfer paths 7 and 7a are opposed to inner surfaces of the outer wall 2 forming the preliminary drying chamber 4 and the main drying chamber 5 at predetermined upper and lower positions, respectively. Guide rail
8a, 8a, etc. are horizontally fixed, the main drying chamber 5 has a 5-layer structure, and the preliminary drying chamber 4 has a 12-layer structure. In each layer, the white tiles WW can be laid down in multiple rows vertically and horizontally. Many palettes 9
Is movably supported.

In the figure, reference numerals 10, 10a ... Are wheels mounted on the pallet 9.

The pallet 9 of each layer is received one by one on the terminal side of the preliminary drying chamber 4 and the starting side of the main drying chamber 5, and the pallet 9 is transferred from each layer on the terminal side of the preliminary drying chamber 4 to the main drying chamber 5. An intermediate lifter 11 that is controlled to move up and down by pushing into each corresponding layer on the starting end side is provided.

Further, below the preliminary drying chamber 4 which is the terminal side of the main drying chamber 5, there is provided an outlet lifter 12 which is controlled to move up and down for receiving the pallets 9 of each layer one by one, and is continuous from the terminal side of the main drying chamber 5. Then, the pallet moving track 13 is continuously provided, and the pallet 9 can be transferred to the start end side of the pallet moving track 13 by the exit lifter 12.

In addition, the inlet end lifter 14 controlled to move up and down receives the pallet 9 on the end of the pallet moving track 13 at the starting end side of the preliminary drying chamber 4 and pushes the pallet 9 into each layer at the starting end side of the preliminary drying chamber 4 to carry it in. Are installed.

Reference numerals 15 and 15a are doors for opening and closing the openings 16 and 16a at the start and end of each layer of the preliminary drying chamber 4 and the main drying chamber 5, respectively.
5 and 15a ... are corresponding to the openings 16 and 16a of each layer of the furnace body 3 and are hinged by spring hinges 17 and 17a at the upper part so that they can be freely opened and closed, and are located below the doors 15 and 15a. Engaging projections 18, 18a ... Are provided at one end portion in the same direction.

Next, since the above-mentioned lifters 11, 12, and 14 have substantially the same structure, only the inlet lifter 14 will be described. A box-frame-shaped frame 19 is arranged in front of the starting end side of the preliminary drying chamber 4. Slide rails 2 in the middle of both sides of the frame 19
The slide rails 20 and 20a are provided by arranging 0 and 20a vertically.
The moving bodies 21 and 21a are provided to be movable up and down, and the moving body 2
The connecting members 22, 22a are horizontally connected between 1 and 21a, and the moving bodies 21 and 21a are moved up and down by the operation of the first drive unit 23 including a motor and a worm reducer that are fixed to the upper portion of the frame 19. It is controlled.

Reference numeral 24 denotes a pallet receiving portion, and the pallet receiving portion 24 has a front end portion on both sides of the connecting members 22, 22a which are connected to each other at the intermediate portions of the moving bodies 21, 21a on the moving body 21, 21a side. Drying room 4
A guide rail 25 extending at a proper distance from the starting end side of the guide rail and having a substantially E-shaped cross section corresponding to the width of the pallet 9.
25a is fixed and sliding grooves on both sides of the guide rails 25, 25a
The rollers 27, 27a ... Are slidably fitted and disposed in the 26, 26a, and the rollers 27, 27a are pivotally supported on the lower ends of the plates 28, 28a. The pressing member 29 is fixed to the pallet to form pallet pressing portions 30 and 30a.

Reference numeral 31 is a drive mechanism for driving the pallet pressing portions 30, 30a. The drive mechanism 31 pivotally supports sprocket 32, 32a ... In front of both ends of the respective guide rails 25, 25a, and the sprocket 32, 32a. ... An endless chain 33, 33a is wound between them to form a conveyor 50, and the chain 33 of the conveyor 50,
33a and the pallet pressing portions 30, 30a are connected to each other, and the chain 33,
The pallet pressing portions 30, 30a are controlled to move back and forth along the guide rails 25, 25a by circulating the pallet pressing portions 30, 30a with the second drive portion 34 such as a motor through an appropriate connecting means.

In addition, as a mounting portion of the pallet 9, the chains 33, 33a
The upper surface of is the mounting surface.

The outlet lifter 12 need only have a structure to receive the pallet 9 and transfer it onto the pallet moving track 13, and the pallet pressing portions 30 and 30a are not necessarily provided.

Reference numeral 35 denotes a door opening / closing mechanism. The door opening / closing mechanism 35 extends the tip end portion of the support member 36 so as to be positioned on the rear side of the engaging protrusions 18, 18a of the doors 15, 15a. And the engaging projection 18,
Place the pallet receiving part 24 to the side of the tip of 18a ...
Of the support member 36, the swinging arm 37 is rotatably supported inward of the tip portion of the support member 36, and the third drive portion 38 such as a motor is connected to the tip portion through an appropriate connecting means. The swing is controlled.

In the figure, 39 is an adjustment weight.

Next, the operation of the drying furnace according to the present invention will be described. A pallet 9 on which a predetermined number of white roof tiles W are placed is moved on the pallet moving track 13 and carried into the inlet lifter 14,
The inlet lifter 14 is controlled to move up and down to an arbitrary height corresponding to each layer of the 12-layer pre-drying chamber 4, and the pallet 9 is sequentially pushed in from the starting end side of the pre-drying chamber 4 at that position.

Then, when a large number of pallets 9 are carried into the preliminary drying chamber 4, the pallet 9 on which the white background W for which the preliminary drying is finished is placed from the terminal side of the preliminary drying chamber 4 is preliminarily moved up and down to the same layer as the arbitrary layer. Then, it is pushed out to the intermediate lifter 11 which is made to stand by and is received and received.

Such drying in the pre-drying chamber 4 is performed by so-called underfloor heating using radiant heat from the partition wall 6 and radiant heat by the heating device, because thermal energy in the main drying chamber 5 is conducted through the partition wall 6. The temperature inside the preliminary drying chamber 4 is raised by the synergistic action to dry.

Next, the intermediate lifter 11 that has received the pallet 9 is controlled to move up and down to an arbitrary height corresponding to each layer of the main drying chamber 5 having a five-layer structure, and the pallet 9 is sequentially moved from the starting end side of the main drying chamber 5 at this position. It is pushed in and carried in.

Then, when a large number of pallets 9 are carried into the main drying chamber 5, the pallet 9 for placing the white background W, which has been dried by coming into contact with hot air that is dry air from the terminal side of the main drying chamber 5, is the arbitrary one. It is pushed out into the exit lifter 12 which is controlled to move up and down to the same level as the layer and is kept in standby, and is received.

Further, when carrying in and out of the preliminary drying chamber 4 and the main drying chamber 5, the swing arm 37 of the door opening / closing mechanism 35 provided in each of the lifters 11, 12, and 14 is swung upward to the pallet receiving portion 24 side. The doors are provided by pressing the engaging projections 18, 18a ... of the doors 15, 15a.
Swing 15, 15a ... upward to open the openings 16, 16a.
The pallet 9 is loaded and unloaded through the openings 16, 16a.

〔The invention's effect〕

In short, according to the present invention, the furnace main body 3 is formed in a tunnel shape by the outer wall 2 made of a heat insulating member, the upper stage of the furnace main body 3 is a preliminary drying chamber 4 by radiant heat, and the lower stage is a main drying chamber 5 by a heating medium. As described above, the partition wall 6 made of a metal having thermal conductivity is divided into sections, and the preliminary drying chamber 4 and the main drying chamber 5 are provided with a large number of pallets 9 on which the white tiles W are laid down in a plurality of rows and columns. Since the transfer furnaces 7, 7a ... Which are movably supported are provided in multiple layers, the thermal energy of the main drying chamber 5 is conducted to the preliminary drying chamber 4 through the partition wall 6, and the thermal energy is used as radiant heat for drying. The heat energy required for drying in the preliminary drying chamber 4 can be saved, and the installation space can be reduced by forming the furnace body 3 in a multi-stage type.
In addition, since the white background W can be dried in the laid state by the pallet 9, the contact efficiency with the hot air in the furnace is improved as compared with the conventional one in which the interval between the white backgrounds is small and the drying is improved. Since the time can be greatly shortened and the pallets 9 can be conveyed in each layer, it is possible to handle tiles and the like having different shapes, and also to support high-mix low-volume production. Can be done.

Further, an inlet lifter 14 for pushing the pallet 9 into each layer of the preliminary drying chamber 4 is provided at the start end side of the preliminary drying chamber 4, and each layer of the main drying chamber 5 is provided at the end side of the main drying chamber 5. An outlet lifter 12 for receiving the pallet 9 extruded from the pallet is provided, and the pallet extruded from each layer on the terminal side of the preliminary drying chamber 4 is provided on the terminal side of the preliminary drying chamber 4 and the starting side of the main drying chamber. An intermediate lifter 11 which receives the pallet 9 and pushes the pallet 9 into each layer on the starting end side of the main drying chamber and carries in the pallet 9 is provided. The lifters 11, 12 and 14 are the starting end sides of the preliminary drying chamber 4 and the main drying chamber 5. And movable bodies 21 and 21a are provided to be movable up and down in front of the end side, and a conveyor 50 for circulating drive for mounting the pallet 9 on the movable bodies 21 and 21a is provided, and conveyors for the inlet and outlet lifters 14 and 12 are provided. 50 is provided with pallet pressing parts 30 and 30a which are interlocked with the driving direction. Therefore, since the pallets 9 are pushed in one by one by the inlet lifter 14 and the intermediate lifter 11, the openings 16, 16a ... In each layer are small, so that heat loss from the openings 16, 16a. The pallets 9 in the pre-drying chamber 4 and the main drying chamber 5 can be sequentially pushed out and moved by the subsequent pallet 9, and a device for moving the pallet 9 in the furnace body 3 is completely unnecessary. In addition, the pallet-type transfer is more convenient than the conventional trolley-type transfer, so that the transfer device can be downsized, the expensive trolley is not required, and the cost can be reduced. Since the pallet pressing portions 30 and 30a which are to be operated are interlocked with the conveyor 50, the drive source thereof can be eliminated, and since they are interlocked with the conveyor 50 in the same direction, the pallet 9 is pushed in and out. Like drive loss digi does not occur is one which consists practical effect very large.

[Brief description of drawings]

1 shows an embodiment of the present invention, FIG. 1 is a schematic plan view of a drying furnace according to the present invention, FIG. 2 is a schematic side view of the same, FIG. 3 is a schematic sectional view of the same, and FIG. Is a schematic front view of the inlet lifter, FIG. 5 is a schematic side view of the same as above, and FIG.
The figure is a sectional view of the main part of AA in FIG. 5 showing a pallet pressing body,
FIG. 7 is an arrow view of a main part of FIG. 5 showing a swing arm of the door opening / closing mechanism, and FIG. 8 is an enlarged view of the main part showing an operating state of the door opening / closing mechanism. 2 ... Outer wall, 3 ... Furnace body, 4 ... Preliminary drying chamber 5 ... Main drying chamber, 6 ... Partition wall, 9 ... Pallet 11 ... Intermediate lifter, 12 ... Exit lifter 14 ... Entrance lifter

Claims (1)

[Claims] 1. A furnace main body is formed in a tunnel shape with an outer wall made of a heat insulating material, and heat is formed so that an upper stage of the furnace main body is a preliminary drying chamber by radiant heat and a lower stage is a main drying chamber by a heating medium. Divided by a partition wall made of conductive metal, the pre-drying chamber and the main drying chamber have a multi-layered transport furnace that movably supports a large number of pallets that lay down a white tile roof in multiple rows and columns. On the other hand, an inlet lifter for pushing the pallet into each layer of the pre-drying chamber is installed at the start end side of the pre-drying chamber, and is pushed out from each layer of the main drying chamber at the end side of the main drying chamber. An outlet lifter for receiving the pallets to be received, and a pallet extruded from each layer on the terminal side of the preliminary drying chamber is received on the terminal side of the preliminary drying chamber and the starting side of the main drying chamber. And push in to each layer on the starting side of the main drying chamber An intermediate lifter is provided, each lifter is provided with a movable body which can be raised and lowered in front of the starting side and the ending side of the preliminary drying chamber and the main drying chamber, and a circulating driven conveyor for placing a pallet on the moving body. A drying furnace, which is provided with a pallet pressing unit that is interlocked with the driving direction of the conveyor of the entrance and exit lifters.