JPH09505662A - Continuous furnace - Google Patents

Abstract

(57) [Summary] A continuous furnace having a passage tunnel (2) extending in the longitudinal direction is provided with a guide track (3) for passing through the reactor. A first distance detector (12) and a second distance detector (18) spaced apart from the first distance detector (12) are arranged in the passage tunnel (2). A first reference point (13) on the guide track (3) belonging to the first distance detector (12) of the measured object (4a) on the guide track (3) by the first distance detector (12). The distance (L1) from the second distance detector (18) belongs to the second distance detector (18) of the measured object (4b) on the guide trajectory (3). The distance (L3) from the second upper reference point (14) is determined. Both reference points are spaced from each other. Both distance detectors form a safety device to detect the curling of the furnace passage.

Description

Detailed Description of the Invention                                   Continuous furnace   The invention is directed to a longitudinally heatable passage tunnel and a furnace passage for Equipped with a guide track and a safety device to detect the warp of the furnace passage on this guide track Regarding continuous furnace.   Such a continuous furnace is disclosed in DE-A-2757700. Is known from The guideways for the passage of the furnace consist of metal of the same length in a row A transfer boat is arranged, and this boat passes through the continuous orbit in order on this guide track. Transported through the flannel. The guideway is at least in front of the entrance of the passage tunnel It consists of metal and has an electrical resistance between this metal part and the heating element on the wall of the passage tunnel. The measuring device is connected. A transfer boat made of metal is inside the passage tunnel of the continuous furnace. Curling while moving through the section creates a short circuit between the transfer boat and the heating element. The resistance measuring device immediately stops the transfer device of the transfer boat. This allows continuous furnace In particular, damage to the heating elements is avoided.   An object of the present invention is to further improve this known continuous furnace so that a transfer boat can pass through it. For example, the transfer boat does not consist of metal, but rather warps in the tunnel. Even if it consists of an electrically non-conductive material such as ceramics, it should be monitored. To enable and.   In order to solve this problem, in a continuous furnace of the kind mentioned at the outset, the invention Then the first distance detector is seen in the passage tunnel and in the direction of this and the passage tunnel. A second distance detector is placed at an interval, and the first distance detector guides the trajectory. From the first reference point on the guide track belonging to the first distance detector of the measured object above Is the second distance detector, and the second distance detector The distance from the second reference point on the guide track belonging to the separation detector is obtained, and The reference points are spaced from each other.   It consists of boats of the same length in which the reactor passages are arranged in a row, and the length of the boat is measured at both distances. One boat is always the first distance detector if it is less than the distance between the origin points of the generator. Exactly the same as another boat passing the reference point of the second distance detector at the reference point of the output device. It is always checked whether the distance has passed. This is because the device is operating normally Indicates that However, one of the boats uses the first distance detector reference point as the other. At the moment the boat passed more than the second distance detector reference point, It was shown that the boat was warped between the two reference points, which resulted in the boat passing through the continuous furnace. Driving through the tunnel is interrupted to clear the anomaly.   Claims 2 to 4 show favorable embodiments of the continuous furnace according to claim 1.   The invention and its advantages are explained in more detail in an exemplary embodiment with reference to the drawing.   FIG. 1 schematically shows a passage tunnel of a continuous furnace according to the present invention,   2 schematically shows a range transmitter in a passage tunnel according to FIG.   FIG. 3 shows a perspective view of a guide track in the passing tunnel according to FIG.   The passage tunnel 2 shown in FIG. 1 is equipped with a guideway 3 for a ceramic boat 4. Well, the boats have the same length and are arranged in a line on the guideway 3. . The ceramic boat 4 is for mounting a sintered material, for example. Passing The panel 2 is further provided with an electric heating element, which is shown in FIG. Not. At the entrance end of the passage tunnel 2, there is a side insertion opening 5 at the other end, i.e., this passage. A side exit 6 is provided at the exit end of the tunnel 2.   At the entrance end of the passage tunnel 2, two feed chains 8 are further provided on the guide track 3. A transfer body 7 is provided. Each of the two feed chains 8 has teeth of a gear 9. The faces are each engaged. Both gears 9 are fitted on the drive shaft 10 of the drive motor 11. I have. An encoder 12 is further attached to the drive shaft 10 as a first distance detector. The reference point of the guide track 3 to which it belongs is the end of the guide track 3 where the lateral insertion slot is located. It is the edge 13 of the part. The encoder 12 is in contact with one ceramic boat 4a The side surface of the transfer body 7, and thus the distance between the ceramic boat 4a itself and the reference point 13 is detected. Put out.   As shown in FIG. 2, the encoder 12 is concentrically fixed to the drive shaft 10 for mounting. It has a segmented disc 24 which is worn. The segment disc 24 is It comprises a large number of circular cord rows 15 arranged concentrically and having different radii. each The code row 15 includes a light source 16 on one side of the segment disc 24 and a cord on the other side. Each has a light barrier with a photodiode 17 corresponding to the light source 16 of ing. It is attached to the corresponding code string in the code pattern of each code string 15. The light rays of the light barrier passing through the segment disc 24.   For each angular position of the drive shaft 10 and thus of the segment disc 24, the encoder 12 Irrespective of the rotation direction of the drive shaft 10, a unique signal is issued, and this signal is used to drive the drive shaft. Of the ceramic boat 4a which is in contact with the transport body 7 The distance from the reference point 13 is read.   At the other end of the guideway 3 and thus the passing tunnel 2, another distance detector, red The infrared light pulse emitted from the outside line and reflected from the side surface of the ceramic boat 4b is received. A laser 18 is provided. This received infrared light pulse is a laser It reaches the photodiode at −18 and converts this infrared light pulse into an electric signal. This electrical signal causes an infrared light pulse from the laser 18 to the ceramic boat 4b. At the time of returning to the laser 18, and thus the guide rail of the ceramic boat 4b. The distance of the laser 18 from the reference point 14 on the road 3 is determined. This reference point 1 4 is a plan at the end of the passage tunnel 2, that is, at the end where the side exit 6 exists. It is the edge of the inner orbit 3.   Furthermore, a laser 18 with an encoder 12 and a photodiode and an example For example, the drive motor 11 is controlled in relation to the control of the temperature sensor including the thermocouple 19. An electronic controller 20 is provided. The thermocouple 19 is at both reference points 13 of the passage tunnel 2. , 14 between them.   The electronic controller 20 is on the guide track 3, measured by the encoder 12. Distance from the reference point 13 of the first ceramic boat 4a of the row of ceramic boats 4a Reference of L1 and ceramic boat 4b at the end of the row of ceramic boats 4 described above When the sum of the distance from the point and the distance L3 deviates from the predetermined value W by Δw, the drive motor Stop 11.   The thermocouple 19 corrects this value W when the passing tunnel 2 is heated differently. In this way, the different lengths of elongation that the ceramic boat in the passing tunnel 2 receives Be considered.   In order to operate the continuous furnace equipped with the passage tunnel 2, first, the transfer body 7 is driven and driven. It is in front of the reference point as seen in the moving direction of the ceramic boat on the guide track by the machine 11. It is sent to the initial position.   Next, the ceramic boat 4a is inserted from the side in the direction of the arrow described through the insertion port 5. Is sent to the guide track 3. This ceramic boat 4a is arranged in the longitudinal direction of the guide track 3. Look, it has the same length as the ceramic boats 4 and 4b already on the guideway. . Further, the length of the ceramic boat 4a is the first distance composed of the encoder 12. Measurement of the second range detector with laser 18 rather than the measuring range of the detector Shorter than range. The length of the ceramic boats 4a, 4 and 4b is also the length of the guide track 3. It is shorter than the distance between the reference points 13 and 14 when viewed in the direction.   Next, the drive motor 11 is turned on again so as to rotate in the feed direction. The carrier 7 It is fed on the guide track 3 in the direction of the laser 18 by the feed chain 8. In that case, the transport bodies 7 are arranged on the guide track 3 in a row and the entire ceramic boat is arranged. 4 is moved in the direction of the laser 18. Ceramic boat 4b reaches outlet 6 Then, the drive motor 11 is cut off, and the ceramic boat 4b is taken out from the side surface. Take it out from the passage tunnel 2 through the opening 6 according to the arrow written there. It is. After that, the same operation is performed from the beginning.   When the ceramic boat moves on the guide track, for example, as shown in FIG. When the two ceramic boats 4 warp upward, the distance between the distances L1 and L3 is increased. Since the sum no longer matches the predetermined value W, the drive motor 11 is immediately switched off. You. This causes damage to the heating elements of the continuous furnace and especially of its passing tunnel It is avoided even if the ceramic boat 4 is not electrically conductive.

Claims (1)

[Claims] 1. Longitudinal heatable passage tunnel and guide track for furnace passages Equipped with a safety device that detects the warp of the furnace passage on this guide track, The first distance detector (12) is placed in the channel (2) in the direction of this and the passing tunnel (2). A second distance detector (18) is arranged at an interval as viewed, and a first distance detector (1 2) the first distance detector (1) of the measured object (4a) on the guide track (3) The distance (L1) from the first reference point (13) on the guide track (3) belonging to 2) is By the second distance detector (18), the object to be measured (4b) on the guide track (3) Is it the second reference point (14) on the guide track (3) belonging to the second distance detector (18)? The distance (L3) is calculated, and the two reference points (13, 14) are spaced from each other. A continuous furnace characterized by being held and arranged. 2. Transfer device (7,8,9,10,11) for furnace pass-throughs (4a, 4,4b) The continuous furnace according to claim 1, wherein the continuous furnace is provided. 3. The transfer device (7,8,9,10,11) uses the double distance detector (12,18). When the measured distances (L1, L3) deviate from the predetermined value (W), In order to stop the transfer device (7, 8, 9, 10, 11), both distance detectors (12, A continuous furnace according to claim 2, characterized in that it is controlled by 18). 4. The value (W) is placed between both reference points (13, 14) of the passing tunnel (2). 4. A station according to claim 3, characterized in that it is controlled by a temperature sensor (19) operating. Follow-up furnace.