JP3039203B2 - Rotary calciner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary calciner used for drying and calcining ceramic materials and the like.

[0002]

2. Description of the Related Art Conventionally, when a ceramic raw material is dried and calcined, a calcining furnace such as a tunnel furnace or a rotary furnace (for example, a rotary kiln) has been used. The tunnel furnace is a furnace in which the ceramic raw material is filled in a sagger and then calcined by passing through a tunnel-shaped furnace.The rotary furnace is charged with ceramic raw material from one end of a cylindrical furnace body having both ends opened.
The ceramic material is calcined by heating the cylindrical furnace while rotating it. The calcined ceramic material is gradually moved to the other end of the cylindrical furnace by the rotation of the cylindrical furnace. Then, at the end, it falls out from the other end and is taken out to the outside.

[0003]

However, the above-mentioned conventional calciner has the following problems. That is, although a homogeneous calcined product can be obtained in the tunnel furnace, there is a problem that the energy efficiency is low due to the use of the sagger, and the apparatus becomes large.

Although the rotary furnace has higher energy efficiency than the tunnel furnace, it has a structure in which both ends are open.
It is difficult to keep the ceramic raw material in the furnace for a long time, so it is difficult to obtain a homogeneous calcined product.Since both ends are open, a large amount of ceramic raw material cannot be filled in the furnace body. Therefore, there is a problem that it is difficult to increase productivity.

In order to extend the residence time of the ceramic raw material in the rotary furnace in the rotary furnace, the rotational speed of the furnace body may be reduced, but in this case, the calcination time must be extended,
As a result, the problem that productivity is further deteriorated arises, and the problem was not solved. In order to solve the problem of productivity deterioration, it is only necessary to increase the tube diameter of the rotary furnace.However, the furnace body of the rotary furnace is made of a ceramic tube. It is technically difficult to manufacture a large diameter ceramic tube, and even if a large-diameter ceramic tube is obtained, it is very difficult to increase its forming accuracy (roundness, straightness, etc.). It was also difficult to improve productivity.

Accordingly, an object of the present invention is to provide a rotary calciner capable of obtaining a homogeneous calcined product with good productivity.

[0007]

In order to achieve the above object, according to the present invention, there is provided a tubular furnace body which is disposed sideways, is driven to rotate around an axis, and is closed at both ends; A calcining material charging mechanism for charging the calcined material into the cylindrical furnace body, wherein the cylindrical furnace body has a supply hole closed on one end side peripheral surface by an openable and closable lid and discharges the other end side end surface. An opening / closing section for opening the openable lid only when the supply hole is positioned at the upper end side of the cylindrical furnace body by rotation of the cylindrical furnace body; And a charging section for charging the calcined material into the cylindrical furnace through the supply hole opened by the above process. The rotary calcining furnace was constituted from the above.

[0008]

According to the above construction, when the supply hole is located at the upper end side of the tubular furnace body, the opening / closing section opens the openable lid to open the supply hole, and the charging section moves from the supply hole to the cylindrical furnace body. The calcined material is put into the furnace. The material to be calcined is charged into the cylindrical furnace and calcined. At this time, since both ends of the tubular furnace body are closed ,
A large amount of material to be calcined can be filled as compared with the one whose one end is open .

The calcined material to be calcined is discharged outside through the discharge hole. The formation position of this discharge hole is related to the filling amount of the calcined material and the residence time in the furnace, and the closer the discharge hole is to the axis of the cylindrical furnace body or the smaller the diameter of the discharge hole, the more the calcined material. As the filling amount increases, the furnace body residence time also increases.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a partially cutaway side view showing the configuration of a rotary calciner according to an embodiment of the present invention, FIG. 2 is an enlarged perspective view showing a main part thereof, and FIG. It is principal part sectional drawing which shows the state at the time.

The rotary calciner 1 is for calcining a ceramic raw material S, and includes a ceramic cylindrical furnace body 2 and a workpiece charging mechanism 3 arranged horizontally.
Both ends of the cylindrical furnace body 2 are closed, and a supply hole 4 is formed in a peripheral surface on one end side, and a discharge hole 5 is formed in a central portion of the other end surface 2a. The supply hole 4 is closed by an openable / closable lid 6. In addition, one end side end surface 2b of the cylindrical furnace body 2
The exhaust pipe 7 communicating with the inside of the cylindrical furnace body 2
Is attached.

The openable and closable lid 6 is slidably mounted in parallel with the axial direction of the cylindrical furnace body 2 and has a protruding portion 8 protruding outwardly of the cylindrical furnace body 2.
The protruding portion 8 has a bent portion 9 halfway. The bent portion 9 is formed to be bent radially inward of the cylindrical furnace body 2. Further, a roller body 10 is attached to the tip of the protruding portion 8. The roller body 10 is rotatably mounted on a rotating shaft 11 erected at the tip of the projection 8 toward the outside in the radial direction of the cylindrical furnace body 2.

The cylindrical furnace body 2 constructed as described above is disposed so as to be slightly inclined downward at the other end (right side in the figure), and is rotated in the axial direction by a rotating mechanism (not shown). It has become. Further, the cylindrical furnace body 2 is heated by a heating body (not shown) disposed around.

The calcined material charging mechanism 3 includes an opening / closing unit 12 and a charging unit 13. The opening / closing section 12 is disposed above one end of the cylindrical furnace body 2 and includes a cylinder 14 and an engaging body 15. The cylinder 14 includes a piston 16 that moves forward and backward toward one end side 2b of the cylindrical furnace body 2 in parallel with the axial direction of the cylindrical furnace body 2, and an engaging body 15 is attached to a tip of the piston 16. Have been. The engagement body 15 has a rectangular parallelepiped shape, and is attached to the piston 16 along a direction orthogonal to the axial direction of the cylindrical furnace body 2. The engagement groove 1 is formed on the bottom surface of the engagement body 15 along the longitudinal direction.
7 are formed. The engagement groove 17 is formed along the rotation locus of the roller body 10 when the piston 16 advances.

The charging section 13 is disposed above the one end of the cylindrical furnace 2, specifically, above the upper end of the rotation locus of the supply hole 4. Consists of The calcined material tank 18 stores the ceramic raw material S, and has a drop hole 20 at its lower end.
Are formed. The shutter unit 19 includes a shutter body 21 and a cylinder 2 connected to the shutter body 21.
2 is provided. The shutter main body 21 is disposed so as to close the drop hole 20, and the shutter main body 21 is slid in parallel by the advance and retreat of the cylinder 22. The drop hole 20 is opened and closed by the shutter unit 19 configured as described above.

Next, the calcining step of the ceramic raw material S using the rotary calciner 1 having the above structure will be described. First, during the calcining step, the cylindrical furnace body 2 is rotated by a rotating mechanism (not shown), and the cylinders 14 and 22 are set in an advanced state. When the cylindrical furnace body 2 is rotated, the supply hole 4 comes to the upper end of the cylindrical furnace body 2 once per rotation. At this time, the roller body 10 provided on the openable lid 6 enters the engagement groove 17 of the engagement body 15. At the same time as the roller body 10 enters the engagement groove 17, the cylinder 14 is moved backward. Then, the openable lid 6 slides and the supply hole 4 is opened. At this time, since the roller body 10 rolls along the inner surface of the engagement groove 17, the cylindrical furnace body 2 rotates smoothly even during the retreat operation of the cylinder 14. At about the same time when the openable lid 6 is opened, the cylinder 22 is retracted and the shutter body 21 is slid and moved, the drop hole 20 is opened, and the ceramic raw material S is discharged from the calcined object tank 18 toward the supply hole 4. Drop.

When a certain amount of the ceramic raw material S is charged into the cylindrical furnace 2, the shutter body 21 is slid by moving the cylinder 22 forward. Then, since the drop hole 20 is closed, the one-time ceramic material dropping operation is completed. Almost at the same time as the end of the operation of dropping the ceramic raw material, the opening and closing cover 6 is slid by closing the supply hole 4 by causing the cylinder 14 to advance. Since the supply hole 4 is closed, even when the supply hole 4 is located at the lower end side of the cylindrical furnace body 2, the ceramic material S inside does not fall down. When such a series of ceramic material charging operations is completed, the roller body 10 is separated from the engagement groove 17.

The above-mentioned ceramic material charging operation is performed intermittently in conjunction with the rotation of the cylindrical furnace body 2. Then, the ceramic raw material S charged into the cylindrical furnace body 2 is gradually moved toward the other end side end face 2a by the inclination of the attachment of the cylindrical furnace body 2 while being stirred by the rotation of the cylindrical furnace body 2. In the meantime, it is calcined by the heat of a heating element (not shown). Then, the calcined ceramic raw material S gathers near the other end side end face 2a, and when a predetermined amount of the calcined ceramic raw material S is deposited, it is discharged to the outside through the discharge hole 5. The discharged calcined ceramic raw material S is stored in a storage box or the like (not shown). Further, the gas generated in the cylindrical furnace body 2 during the calcination is discharged to the outside via an exhaust pipe.

The amount of the ceramic raw material S that can be charged into the cylindrical furnace body 2 is determined by the size of the discharge hole 5 formed at the center of the other end surface 2a. That is, in order to increase the filling amount, the diameter of the discharge hole 5 may be reduced.

The present inventor compared the rotary calciner of the present invention with the conventional rotary calciner in terms of the filling rate of the material to be calcined. 20-3
While the filling rate was 0%, it was found that the rotary calcining furnace of the present invention can obtain a filling rate of almost 50%.

[0021]

As described above, according to the present invention, a cylindrical furnace body having both ends closed can be used as the furnace body, so that one end of the cylindrical furnace body on the side where the calcined material is charged is opened. ing
A larger amount of the material to be calcined could be filled as compared with the product, and the productivity was improved accordingly. In addition, since a large amount of calcined material can be handled at a time, a small-diameter furnace body with high forming accuracy can be used, and the apparatus can be downsized.

Furthermore, since both ends of the furnace were closed, the calcined material could stay in the furnace for a long time, and a homogeneous calcined product was obtained.

In addition, since both ends of the furnace body are closed, dust and gas generated in the furnace body can be easily collected and treated, and the dust and gas adversely affect the surrounding environment. Now you can minimize it.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view showing a configuration of a rotary calciner according to one embodiment of the present invention.

FIG. 2 is an enlarged perspective view showing a main part of the embodiment.

FIG. 3 is a sectional view of a main part showing a ceramic raw material charging operation state.

[Explanation of symbols]

 2 Cylindrical furnace body 3 Material to be calcined charging mechanism 4 Supply hole 5 Discharge hole 6 Openable lid 12 Opening / closing section 13 Loading section

Claims (1)

(57) [Claims] 1. A tubular furnace body (2) which is arranged sideways, is driven to rotate around an axis and is closed at both ends, and a calcined material (S) is charged into the tubular furnace body (2). A tubular furnace body (2) having a supply hole (4) closed by an openable / closable lid (6) on one end side peripheral surface, and a second end side end surface; has a discharge hole (5) in the target precalcination shooting mechanism (3) is the upper end side of the supply hole (4) is circular cylindrical furnace body by the rotation of the cylindrical furnace body (2) (2) positions opening and closing unit (12) for opening the openable lid (6) only when, and to the cylindrical furnace body (2) in from the supply hole is opened (4) by the closing part (12) in said tube Furnace body
A rotary calciner comprising: a charging section (13) for intermittently charging the calcined material (S) in conjunction with the rotation of (2) .