JP2007051793A - Conveyance abnormality preventing method and device for treated article in tunnel kiln - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conveyance abnormality preventing device for a treated article in a tunnel kiln capable of preventing the occurrence of conveyance abnormality in the kiln caused by the damage of base plates in the tunnel kiln. <P>SOLUTION: A pressurizing cylinder device 7 serving as a load device for applying load to the base plates 4 is disposed on the lower side of a suitable position of a moving line from which burned products are removed, and load is gradually applied from below to the base plates 4 to be fed into a conveying line in the kiln, to detect the presence of damage of the base plates. The base plates detected to be damaged by load are removed from the line, and new and sound base plates are replenished. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is a tunnel furnace for firing processed products such as ceramic elements, and is capable of preventing abnormalities in the transport of processed products in the furnace due to damage to the base plate. And device.

  The tunnel furnace is a furnace for continuously firing processed products (fired products) such as ceramic elements. As shown in FIG. 7, the furnace main body 1 and the processed product 5 placed on the base plate 4 are furnaces. An in-furnace transport path 2 for transporting into the main body 1 and an out-of-furnace transport path 3 connected to the in-furnace transport path 2 and circulatingly moving the processed product 5 placed on the base plate 4 to the in-furnace transport path 2. Consists of.

  Specifically, the out-of-furnace movement path 3 includes a first movement path 3A provided in parallel with the in-furnace conveyance path 2, a second movement path 3B connecting the first movement path 3A and the in-furnace conveyance path 2, and a third movement. The movement path includes a path 3 </ b> C, which constitutes a closed-loop conveyance path for circulating and moving the processed product 5 placed on the base plate 4 to the in-furnace conveyance path 2.

  In FIG. 7, 6A, 6B, 6C, and 6D are pushers for moving in the direction of the arrow and pushing the base plate 4, respectively, and the circular movement of the base plate by the pusher is performed as follows. That is, when the pusher 6A pushes the base plate 4A on which the processed product 5 is placed into the furnace main body 1, the base plate arranged in the in-furnace transport path 2 in the furnace main body 1 moves in a ball, and the processing in which the firing is completed is performed. The base plate 4B on which the product is placed is taken out of the furnace, pushed by the pusher 6B, and the base plate arranged in the second movement path 3B moves in the ball movement, and the base plate 4C moves on the first movement path 3A.

  Next, the pusher 6D is actuated to push the base plate 4D on which the processed product 5 is placed to move the base plate 4E to the position where the base plate 4A is located, and then the pusher 6C pushes the base plate 4C to 4F is moved to the position where the base plate 4D is located. In the process, the fired processed product 5 is taken out from the base plate moving on the first movement path 3A and fired on the base plate at the position of the base plate 4D. A new treatment product 5 is placed, and a baking operation is performed by the same operation. FIG. 8 shows an example of how the base plate 4 and the processed product 5 are placed on the in-furnace transport path 2 and the out-furnace movement path 3. 9 is a roller.

  In such a firing operation in the pusher-type tunnel furnace, the base plate 4 is transported in an aligned state on the transport path 2 in the furnace during normal operation, but the base plate 4 transported in the furnace is damaged. If the base plate is cracked, broken, or deformed, the base plate may be removed from the transport path, or the subsequent base plate that is pressed into the base plate by the pusher may run over, causing trouble in the transport and hindering the baking operation. May lead to an accident that damages the furnace wall.

Up to now, as a method for detecting a conveyance abnormality in a tunnel furnace, a method for detecting an abnormality by detecting a pressure change of a pusher, a method for detecting an abnormality by blocking a laser beam traveling straight in the furnace (Patent Document 1), A method (Patent Document 2) is proposed in which a base plate that moves is detected by a CCD camera and a conveyance abnormality is detected from fluctuations in an image pattern. However, this method is not always satisfactory in practice.
Japanese Utility Model Publication No. 56-50393 JP-A-6-323743

  The present invention was made in a tunnel furnace in order to prevent the occurrence of abnormal transport in the furnace due to damage to the base plate, and its purpose is to reliably detect damage to the base plate by extremely simple means. An object of the present invention is to provide a method and an apparatus for preventing abnormalities in the handling of processed articles in a tunnel furnace so that the base plate in which damage is detected is removed before being transported into the furnace.

  According to the first aspect of the present invention, there is provided a method for preventing an abnormality in conveying a processed article in a tunnel furnace, the furnace for firing the treated article, and the inside of the furnace for conveying the treated article placed on the base plate into the furnace. A transfer path and an out-of-furnace movement path for circulating and moving the processed product placed on the base plate to the in-furnace transfer path are connected to the in-furnace transfer path, and the base plate on which the processed product is placed is In a tunnel furnace configured to be fed into a furnace, it is a method for preventing a transport abnormality from occurring in the furnace due to damage to the base plate. It is characterized in that a load is applied to detect damage to the base plate, and the base plate in which the damage is detected is removed.

  The apparatus for preventing abnormalities in the processing of a tunnel furnace according to claim 2 includes a furnace for firing the processed goods, an in-furnace transport path for transporting the processed goods placed on the base plate into the furnace, and the in-furnace transport Tunnel that is connected to the path and has an out-of-furnace movement path to circulate and move the processed product placed on the base plate to the in-furnace transport path, and the base plate on which the processed product is placed is sent into the furnace by a pusher In the furnace, a load device for applying a load to the base plate to be sent to the in-furnace transport path is provided in the out-of-furnace moving path.

  According to a third aspect of the present invention, there is provided an apparatus for preventing abnormalities in the handling of processed articles in a tunnel furnace according to the second aspect, wherein the load device is a pressurizing cylinder device arranged below the out-of-furnace movement path.

  According to a fourth aspect of the present invention, there is provided an apparatus for preventing abnormalities in the handling of processed goods in a tunnel furnace. In the third aspect, as a detection device for detecting damage to a base plate caused by a load, the apparatus detects a pushing length of a piston rod of a pressure cylinder device. A pressure sensor for detecting a pressure change of the position sensor or the pressure cylinder device is provided.

  According to the present invention, damage to the base plate can be reliably detected by an extremely simple means, and the base plate in which the damage is detected is removed before being transported into the furnace. Provided are a method and an apparatus for preventing abnormalities in the conveyance of a processed article in a tunnel furnace that can prevent the occurrence of an abnormality in the tunnel furnace.

  Hereinafter, specific embodiments for preventing abnormalities in the conveyance of processed products in a tunnel furnace according to the present invention will be described with reference to the drawings.

  As shown in FIGS. 7 to 8, the apparatus for preventing abnormalities in processing of a tunnel furnace according to the present invention includes a furnace body 1 for firing a processed product and a processed product 5 placed on a base plate 4 as shown in FIGS. An in-furnace transport path 2 for transporting into the main body 1 and an out-of-furnace transport path 3 connected to the in-furnace transport path 2 for circulating and moving the processed product placed on the base plate to the in-furnace transport path 2 It is assumed that the base plate on which the processed product is placed is sent into the furnace by the pusher 6A, and the base plate is circulated by the pushers 6B, 6C, 6D.

  In order to prevent the conveyance abnormality from occurring in the tunnel furnace due to the damage of the base plate 4, the damaged base plate may be removed before being transferred into the furnace. Inside, a load device for applying a load to the base plate 4 to be sent to the in-furnace transport path 2 is provided.

  As a preferred embodiment, as shown in FIGS. 1 to 6, as a load device in the out-of-furnace moving path 3, desirably below the appropriate position of the first moving path 3 </ b> A where the baked processed product 5 is removed. The pressurizing cylinder device 7 is arranged, the piston rod 8 is extended, and the base plate 4 to be circulated to the in-furnace transport path 2 via the third movement path 3C is as shown in FIGS. A load is gradually applied to detect whether the base plate 4 is damaged. 1, 3 and 5 are side views of the movement path, and FIGS. 2, 4, and 6 are front views of FIGS.

  Therefore, for example, a base plate with some defects, such as a cavity inside, foreign matter mixed in, or cracking, is cracked, chipped, or deformed by a load from below. It is preferable to measure the limit (minimum) load in advance and apply the limit (minimum) load.

  When the limit load is applied, as shown in FIG. 5, if cracks or breakage occurs, the base plate 4 may be cracked, broken, deformed, or the like while being transported through the in-furnace transport path 2. As described above, this causes abnormalities in conveyance. Therefore, the base plate in which such damage is caused by the load is removed from the line, and a new healthy base plate is replenished.

  When the pressurizing cylinder device 7 is arranged as a load device on the lower side of the out-of-furnace movement path 3 such as the first movement path 3A, a roller 9 is disposed on the path of the place, for example, as shown in FIGS. The piston rod 8 of the pressure cylinder device 7 comes into contact with the base plate 4 so that a load can be applied to the base plate 4. The load device is not limited to the pressurizing cylinder device, and other types of devices such as a device that drops the load from above can be applied.

  Damages such as cracks and breaks in the base plate caused by the load can be observed visually. However, when operating automatically under unattended monitoring, the length of the piston rod of the pressure cylinder device is detected. If a position sensor is attached and the position sensor detects that the extrusion length has exceeded a specific value and the base plate has been damaged, such as cracking or breakage, an alarm is sounded, etc. You can be notified.

  In addition, a pressure detector that detects the pressure change of the pressure cylinder device is attached, and when the base plate is cracked, chipped, or deformed by a load from below by the pressure cylinder device, the pressure change (for example, When the pressure change is detected by the pressure detector, it is judged that the base plate has some defects and an alarm is sounded to notify the base plate abnormality. You can also make it.

It is a partial side view which shows the example which arrange | positions a pressurization cylinder apparatus as a load apparatus in the processed goods conveyance abnormality prevention apparatus of the tunnel furnace of this invention. It is a partial front view of FIG. FIG. 2 is a partial side view showing a point in time when the pressure cylinder device is operated in FIG. 1 and the piston rod comes into contact with the base plate. FIG. 4 is a partial front view of FIG. 3. In FIG. 1, it is a partial side view which shows the time of a load being applied to the base plate by the operation of the pressure cylinder device and the base plate being broken. FIG. 6 is a partial front view of FIG. 5. It is a schematic plan view which shows the structure of a tunnel furnace. FIG. 8 is a partial perspective view showing an example of a mounting form of a base plate and a processed product on the path in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Furnace body 2 In-furnace conveyance path 3 Out-of-furnace movement path 3A 1st movement path 3B 2nd movement path 3C 3rd movement path 4 Base plate 5 Processed product 6A Pusher 6B Pusher 6C Pusher 6D Pusher 7 Pressure cylinder device 8 Piston rod
9 Roller

Claims (4)

A furnace for firing the treated product, an in-furnace transport path for transporting the treated product placed on the base plate into the furnace, and the treated product placed on the base plate connected to the intra-furnace transport path in the furnace In a tunnel furnace equipped with an out-of-furnace movement path for circulating movement to the conveyance path, and a base plate on which processed products are placed is sent into the furnace by a pusher, a conveyance abnormality occurs in the furnace due to damage to the base plate This is a method for preventing the occurrence of damage, and in the out-of-furnace movement path, a load is applied to the base plate to be sent to the in-furnace transport path to detect damage to the base plate, and the base plate in which the damage is detected is removed. A method for preventing abnormalities in the handling of processed goods in a tunnel furnace. A furnace for firing the treated product, an in-furnace transport path for transporting the treated product placed on the base plate into the furnace, and the treated product placed on the base plate connected to the intra-furnace transport path in the furnace In a tunnel furnace equipped with an out-of-furnace transfer path for circulating movement to the transfer path, and a base plate on which a processed product is placed is sent into the furnace by a pusher, in the out-of-furnace transfer path, in the in-furnace transfer path An apparatus for preventing abnormalities in the handling of processed goods in a tunnel furnace, characterized in that a load device is provided for applying a load to a base plate to be fed, and the base plate in which damage caused by the load is detected is removed. The apparatus for preventing abnormalities in the handling of processed goods in a tunnel furnace according to claim 2, wherein the load device is a pressurizing cylinder device arranged below the out-of-furnace moving path. As a detection device for detecting damage to the base plate caused by a load, a position sensor for detecting the pushing length of the piston rod of the pressure cylinder device or a pressure detector for detecting a pressure change of the cylinder device is provided. The apparatus for preventing abnormalities in the handling of processed goods in a tunnel furnace according to claim 3.

Images