JPH063062A - Batch type kiln - Google Patents

Abstract

PURPOSE:To prevent calcination from being unsatisfactorily done or being interrupted owing to the collapse of a frame in a batch type kiln by properly correcting the piled attitude of the articles. CONSTITUTION:In a batch type kiln which comprises a hearth 3 rotating with frames S loaded thereon and a piller 7 vertically standing on the hearth 3 to support articles, there are provided a detection member 8 capable of making contact with the upper portion of the pillar 7 and an inclination sensor 9 for detecting the inclination of the pillar 7 through the detection member 8. There is further provided correcting means 10 for correcting the piled attitude of the frames while pressing the peripheral side surfaces of the frames S piled on the hearth 3 in relation to the inclination detection by the inclination sensor 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a batch-type firing furnace for firing an article to be fired such as a ceramic molded article by rotating the hearth while rotating it around a vertical axis. The present invention relates to a structure for preventing the collapse of the shredded box.

[0002]

2. Description of the Related Art Conventional batch type firing furnaces have been
As shown in the vertical cross-sectional view of FIG. 4 and the horizontal cross-sectional view of FIG. 5, it has a cylindrical furnace body 21, a circular hearth 22, and a heater 23. A firing chamber 24 having an open bottom is formed in the furnace body 21, and the hearth 22 is configured to rotate about the vertical axis with the open bottom of the firing chamber 24 closed.

An object to be fired such as a ceramic molded product is housed in a box S formed in a predetermined plane shape, for example, a fan shape, and the boxes S are circularly arranged on the mounting table 25 on the hearth 22. It is then stacked in multiple layers above and below. Then, the objects to be fired are rotated together with the hearth 22 to be heated under the same heating conditions and uniformly fired.

[0004]

By the way, in the above-mentioned firing furnace, the box S stacked on the hearth 22 may be misaligned due to the vibration during rotation and the stacking posture may be lost. In such a case, uniform firing may not be possible, cracks may occur in the object to be fired or the box S, and further, there is a possibility that part of the furnace will be damaged.

Therefore, in the conventional firing furnace, several pillars 26 are erected on the hearth 22 and through holes of the pillars 26 are formed in each box S, and the pillars 26 are formed in each box S. By making it penetrate, the stacking posture of the box S is adjusted vertically.

However, if a large number of the plurality of steps S supported by the same support 26 are displaced at a time, an excessive load is intensively applied to the base of the support 26 and the support 26 The stacking posture of the box S is greatly collapsed due to the folding and collapse of the box.

[0007] Once the stacking posture of the box S is collapsed, in order to prevent further collapse, the rotation of the hearth 22 must be stopped, and the subsequent firing must be performed without changing the position of the article to be fired. Therefore, firing under uniform heating conditions becomes impossible.
Further, when the collapse of the stacking posture is large, the firing must be stopped at that point, and all the objects to be fired during the firing are wasted.

The present invention addresses such conventional problems, and makes it possible to appropriately correct the stacking posture of the box so as to avoid firing failure due to collapse of the box and interruption of firing. It is an issue.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention is a batch type equipped with a hearth for loading and rotating a box and a column for supporting the box standing upright on the hearth. In the firing furnace, a detection member that can come into contact with the upper portion of the support, and an inclination sensor that detects the inclination of the support via this detection member,
In relation to the inclination detection by the inclination sensor, the correction means is provided to press the peripheral side surface of the box stacked on the hearth to correct the stacking posture.

[0010]

In the above structure, when the boxes stacked on the hearth are misaligned and the support columns tilt, the tilt is detected by the tilt sensor via the detection member. Then, in relation to the inclination detection by this inclination sensor, the correction means protrudes toward the box, and presses the circumferential side surface of the box in which the stacking posture is collapsed,
This will vertically correct the stacking posture of the box.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to an embodiment shown in FIGS. FIG. 1 is a vertical cross-sectional view of a batch-type firing furnace according to an embodiment of the present invention, FIG. 2 is a perspective view from the lower surface side of a detection member, which is a part thereof, and FIG.
(B) is an operation explanatory view, (A) shows the side surface shape of the main part in a furnace, and (B) has shown the planar shape, respectively.

As shown in FIG. 1, the batch type firing furnace of this embodiment has a cylindrical furnace body 2 in which a firing chamber 1 having an open bottom is formed, and a circular furnace for closing the open bottom of the firing chamber 1. Is provided with a heater 4 surrounding the hearth 3, and the hearth 3 has a motor 6 while the boxes S are stacked thereon in a plurality of upper and lower stages via a mounting table 5. It is the same as the conventional firing furnace in that it is rotated around the vertical axis by driving. Further, a plurality of pillars 7 are erected on the hearth 3, and the pillars 7 are vertically penetrated through the stacking stage of the box S to vertically adjust the stacking posture of the box S. Is the same as the conventional example.

The difference between the batch type firing furnace of this embodiment and the conventional one is that the detection member 8 that can come into contact with the upper ends of the columns 7 is used.
And a tilt sensor 9 for detecting the tilt of the column 7 through the detection member 8 and a push plate 10 which is a correction means for correcting the stacking posture of the box S.

The detecting member 8 is provided on the upper part of the furnace body 2 so as to be tiltable, and as shown in FIG.
It is composed of a disk-shaped main body 8b having a and an extension rod 8c extending upward from the main body 8b.
Penetrates through a through hole 11 formed in the upper portion of the furnace body 2 and projects to the outside. In the annular groove 8a of the main body 8b, the support 7
When the pillar 7 is tilted, the upper end of the column contacts the side wall of the annular groove 8a.

The tilt sensor 9 is, for example, a piezoelectric vibrating gyro that uses a regular triangular prism vibrator, and is attached to the extension rod 8c of the detecting member 8 outside the furnace body 2. The detection signal of the tilt sensor 9 is input to the control unit 12 that controls the operation of the motor 6 and the heater 4.

The push plate 10 is for pressing the peripheral side surface of the stacking stage of the box S to correct the stacking posture thereof.
Is operatively connected to a piston rod of an air cylinder 13 provided outside the furnace through the furnace wall, and is extended toward the center of the firing chamber 1 by the expansion operation of the air cylinder 13. The expansion / contraction operation of the air cylinder 13 is controlled by the control unit 12 described above.

In the above-mentioned structure, the objects to be heated are housed in the box S, and the boxes S are circularly arranged on the hearth 3 via the mounting table 5 and stacked in a plurality of upper and lower stages. In this case, the stacking posture is vertically adjusted by penetrating the pillar 7 through each box S.

The material to be fired is heated while rotating in the firing chamber 1 by the rotation of the hearth 3.
The boxes S stacked on the hearth 3 are displaced at a time as shown in FIGS. 3 (A) and 3 (B) due to vibration during rotation, etc. May lose the stacking posture.

In this way, when any one of the stacking steps of the box S is misaligned, the support column 7 penetrating the stacking step tilts and projects into the annular groove 8a of the detecting member 8. The upper end contacts the side wall of the annular groove 8a and pushes the detection member main body 8b in one direction on the outer circumference. As a result, the entire detection member 8 is tilted, and the tilt is detected by the tilt sensor 9.

The control unit 12 recognizes the occurrence of the positional deviation of the box S by the detection signal from the tilt sensor 9, but the furnace S continues to rotate and the box S where the positional deviation occurs is at an angle of the push plate 10. When the position is reached, the driving of the motor 6 is stopped and the rotation of the hearth 3 is stopped. Then, the air cylinder 13 is extended. By the extension operation of the air cylinder 13, the push plate 10 moves forward to press the peripheral side surface of the stack S of the misaligned boxes S. By this pressing, the posture of the stacking stage of the box S is vertically corrected.

After the correction of the stacking posture, the push plate 10 is retracted, the hearth 3 starts rotating again, and the firing while rotating is restarted.

[0022]

As described above, according to the present invention, it is possible to appropriately correct the stacking posture of the box, eliminate the firing failure due to the collapse of the box, and surely perform uniform firing. Further, it is possible to prevent cracking of the object to be fired or the box and occurrence of inconvenience such as interruption of firing.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a batch type firing furnace according to an embodiment of the present invention.

FIG. 2 is a perspective view from the lower surface side of a detection member that is a part of the above embodiment.

FIG. 3 is an explanatory view of the operation of the above embodiment, (A) shows a side surface shape of a main part in the furnace, and (B) shows a planar shape thereof.

FIG. 4 is a vertical sectional view of a conventional batch type firing furnace.

FIG. 5 is a cross-sectional view of the above conventional example.

[Explanation of symbols]

 1 Firing Chamber 2 Furnace Body 3 Hearth 4 Heater 7 Support 8 Detection Member 9 Inclination Sensor 10 Push Plate (Correcting Means) 13 Air Cylinder

Claims (1)

[Claims] 1. A hearth (3) for loading and rotating a box (S)
And a pillar (7) for supporting the box that stands upright on the hearth (3)
And a tilt sensor (9) for detecting the tilt of the column (7) via the detection member (8) that can come into contact with the upper portion of the column (7), And a correction means (10) for pressing the peripheral side surface of the box (S) stacked on the hearth (3) and correcting the stacking posture in association with the tilt detection by the tilt sensor (9). A batch-type firing furnace characterized by the above.