JPH0436588A - Roller breakage detector for roller hearth kiln - Google Patents

Abstract

PURPOSE:To enable a roller breakage accident to be detected promptly and securely, by forming each roller support shaft of a conductor, providing detecting parts at predetermined positions, stretching a conductor wire on the forward side of each of the detecting parts with respect to an energizing direction for movement by an elastic member, and connecting the wire and the support shaft respectively to both electrodes of a power supply. CONSTITUTION:Each roller (a), comprising a metallic support shaft 16 and a metallic collar 23, has a wire 35 connected through a lead wire to the positive side of a DC power supply 38, and the collar 23 is grounded. A detecting circuit 40 is thus constructed in which both electrodes of the power supply 38 are connected to each other through a normally open switch 39 constituted of the wire 35 and the collar 23. When the roller (a) is broken, the support shaft 16 is pushed out by the recoil strength of a compression spring 22 to the side of a furnace wall 1a while pushing the broken roller, and the collar 23 at the rear end of the shaft 16 comes into contact with the wire 35 stretched on the front side of the collar 23. As a result, the switch 39 of the detecting circuit 40 relevant to the unit containing the broken roller (a) is closed, and an electric current flows in the circuit 40, operating an alarm 41. The roller breakage accident and the unit containing the broken roller (a) are thus indicated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a method in which a large number of ceramic rollers are arranged in parallel inside a tunnel-shaped furnace body, penetrating the furnace walls on both sides, and the rollers are placed on the rollers by rotation of the rollers. The present invention relates to a device that promptly detects the occurrence of a breakage accident of a roller in a roller hearth kiln that continuously bakes baked products while conveying them in one direction.

Conventional technology In a conventional roller hearth kiln, a large number of ceramic rollers are arranged in parallel inside a tunnel-shaped furnace body and pass through the furnace walls on both sides. While freely supporting only rotation of the rotating shaft,
On the outside of the other furnace wall, supporting shafts concentric with each rotating shaft and forming a pair with each other are supported so as to be freely rotatable and freely movable in the axial direction,
By urging the support shaft to move in the direction approaching the corresponding rotating shaft by the elasticity of the elastic member and pinching both ends of the roller between the two shafts, or by hanging both ends of the roller on the corresponding two shafts. By stopping the support shaft and urging it to move in the direction away from the rotating shaft by the elasticity of the elastic member, each roller is supported so that it can rotate integrally with the rotating shaft, and as each roller rotates, it is placed on that roller. There is a known method in which a fired product is conveyed in one direction and fired continuously.

Problems to be Solved by the Invention By the way, in such roller hearth kilns, the rollers often break due to their service life while the kiln is in operation. In many cases, it is simply overlooked. If operation continues with the breakage accident occurring, the products to be fired will fall one after another, resulting in a large number of defective products.

Means for Solving the Problems The roller breakage detection device for a roller hearth kiln of the present invention has the following features:
It was completed to solve the above problems,
Each support shaft is made of a conductive material, and a detection part is provided at a certain position, and a conductive wire that can be hit by each detection part is stretched in front of each detection part in the movement urging direction by an elastic member,
By connecting the conductive wire and the support shaft to both poles of a power source, the conductive wire and the detection section form a detection circuit that constitutes a normally open switch, and a display means is interposed in the detection circuit.

Functions and Effects of the Invention The present invention has the above-mentioned structure, and when the roller breaks and falls into the furnace, the structure in which both ends of the roller are sandwiched and supported between the rotation shaft and the support shaft by the elasticity of the elastic member is used. Well,
The support shaft is pushed toward the furnace body by its elasticity, and in a structure in which both ends of the roller are hooked to both shafts and supported by being pulled by the elasticity of an elastic member, the support shaft is pushed away from the furnace body. As a result, the detection section provided on the support shaft comes into contact with the conductive wire stretched in front of it. As a result, the switch of the detection circuit closes, current flows through the detection circuit, and the display means indicates that a breakage accident has occurred.

That is, according to the present invention, if a roller breakage accident occurs, it is immediately detected and displayed by the display means, so that the occurrence of a breakage accident can be known early and reliably.
By promptly taking measures such as stopping the operation and replacing the rollers, it is possible to minimize the occurrence of defective products.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIGS. 1 to 4.

In FIG. 1, reference numerals 1a and 1b denote the furnace walls on both the left and right sides of a tunnel-shaped furnace body, and in both the furnace walls 1a and 1b, a large number of through holes 2 corresponding to each other are spaced at regular intervals in the front and rear direction. A pipe-shaped ceramic roller a is loosely fitted through both prize holes 2.

A mounting body 3 installed along the outside of one furnace wall 1b has a support fitting 7 formed with a spherical concave surface 8 attached to its tip, and a rotating shaft 6 fitted with a sprocket 9 at its rear end.
A drive unit 5, in which only rotation is freely supported in a support cylinder 1O, is attached with screws 11 at each position corresponding to the through hole 2 of the furnace wall lb. A mounting body 13 installed along the outside of the other furnace wall 1a supports a support shaft 16 having a support fitting 7 having a spherical concave surface 8 attached to its tip at each position corresponding to the drive unit 5 described above. Cylinder 1
A support unit 15 which is supported within 7 so as to be freely rotatable and freely movable in the axial direction is fixed with screws 18 . Each support shaft 16 has a spring receiver 20 fixed to its tip side,
Furnace wall 1a
A moving force is applied in the direction approaching the support shaft 16.
A collar 23 for preventing removal is fixed to the rear end with a screw 24.

A cap 25 having a spherical head 26 is fitted to both ends of each of the rollers a, and the cap 25 is applied to the spherical concave surface 8 of the support fitting 7 of the corresponding rotation shaft 6 and support shaft 16. , are sandwiched and supported by the elastic expansion force of the compression coil spring 22 described above. The sprocket 9 of each rotating shaft 6 is engaged with a chain 28 that is supported by a guide rail 27 and runs in circulation, and as each rotating shaft 6 is rotationally driven by the running of the chain 28, each roller λ
rotate at the same time, and the article to be fired placed thereon is conveyed in one direction within the furnace body, during which time firing is performed. The above is similar to the structure of a conventionally known roller hearth kiln.

In this embodiment, at least the support shaft 16, the collar 23, the support tube 17, the bearing 17λ, and the attachment body 13 are made of metal, and by grounding the attachment body 13, the support tube 17, the bearing 17a, and the support shaft 16 Each collar 23 is grounded via.

Further, the entire roller a is divided into a plurality of groups each having a plurality of rollers, and as shown in FIG.
At the boundary between each set on the outer surface side of the mounting body 13 to which 5 is attached, an insulator 30 having insulating properties for wire tensioning is installed.
It is attached to the upper end of a bracket 31 protruding from the bottom surface of the attachment body 13 with a screw 32. Each insulator 30 has a first
As shown in the figure, two circumferential grooves 34 are arranged side by side, and the two circumferential grooves 34 are located inside the collar 23 attached to the rear end of the support shaft 16. , and the upper edge of the circumferential groove 34 is located above the lower edge of the collar 23. And the outer circumferential groove 34 of the negative insulator 30
The other end of a metal wire 35 with one end fixed to the insulator 30 is hung on the outer circumferential groove 34 of the adjacent insulator 30, and a weight 36 is suspended from the tip, and the inner circumference of the insulator 30 is suspended. The other end of another wire 35 with one end fixed in the groove 34 is hung in the circumferential groove 34 inside the next insulator 30, and the weight 36 is suspended from the tip thereof.
An outer circumferential groove 3 and an inner circumferential groove 3 are formed between adjacent insulators 30, respectively.
The wire 35 is stretched straight by the weight of the weight 36 by using the weights 36 and 4 alternately. That is, for each set of rollers λ described above, one wire 3 is provided inside each collar 23 at a height that can engage with the lower edge of the collar 23.
5 is posted.

In each set of rollers a, the wire 35 is connected to the positive electrode side of the DC power supply 38 by a lead wire (not shown), while the collar 23 is grounded as described above, so that the equivalent circuit shown in FIG. As shown in the figure, the DC power supply 38
A detection circuit 40 is formed in which both poles of the circuit are connected via a normally open switch 39 composed of a wire 35 and a collar 23, and the detection circuit 40 is activated when a current flows through the detection circuit 40. An alarm device 41 that sounds a buzzer is connected in series.

Next, the operation of this embodiment will be explained.

When the roller a breaks, the support shaft 16 supporting the roller a pushes the broken roller 3 toward the furnace wall 1a by the elastic expansion force of the compression coil spring 22, as shown in FIG. Then, the collar 23 at the rear end of the support shaft I6 comes into contact with the wire 35 stretched in front of it. As a result, the switch 39 of the detection circuit 40 corresponding to the set including the roller a is closed, current flows through the detection circuit 40, and the alarm 41 sounds a buzzer. As a result, it is notified together with the set of rollers λ that there has been a breakage accident with the roller λ.

As described above, in this embodiment, since the rollers a are divided into a plurality of groups and the detection circuit 40 is provided for each group, it is immediately known in which group the roller a has broken. Since the support shaft 16 is recessed into the furnace wall l&, it can be easily identified, so by stopping the operation and replacing the roller λ with a new one, it is possible to minimize the occurrence of defective products due to falling of the fired product. I can do it.

Of course, it is also possible to have a simple structure in which only one detection circuit 40 is formed by stretching one wire 35 without dividing the rollers λ into a plurality of groups.

Furthermore, the present invention allows the roller λ to be moved by hooking both ends of the roller λ to the tips of the corresponding rotating shaft 6 and supporting shaft 16, and pulling the supporting shaft 16 in a direction away from the rotating shaft 6 by the elasticity of an elastic member. It can be similarly applied to a structure in which the roller a is supported so as to be able to rotate integrally with the rotating shaft 6, and in that case, the roller λ
When the support shaft 16 is broken, the support shaft 16 is pulled in a direction away from the furnace wall 1a, so the wire 35 may be stretched outside the rear end of the support shaft 16 as a detection section.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway sectional view of an embodiment of the present invention, Fig. 2 is a side view of the support shaft seen from the mounting body side, Fig. 3 is a circuit configuration diagram of the detection circuit, and Fig. 451J is a diagram of the roller. It is a partial cross-sectional view of a state in which a breakage accident has occurred. 2: Roller laS lb: Furnace wall 3.13: Mounting body
6: Rotating shaft 9: Sprocket 16: Support shaft 22:
Compression coil spring 23: Collar 27: Chain 30:
Insulator 35: Wire 36: Weight 38: DC power supply
39: Normally open switch

Claims (1)

[Claims] A large number of ceramic rollers are arranged in parallel inside a tunnel-shaped furnace body and pass through the furnace walls on both sides, and a large number of rotating shafts connected to a drive mechanism are installed on the outside of one of the furnace walls. In addition to freely supporting rotation only, support shafts that are concentric with each of the rotating shafts and forming a pair with each other are supported on the outside of the other furnace wall so as to be freely rotatable and freely movable in the axial direction, and the support shafts are elastically supported. By biasing the member to move in a direction approaching the corresponding rotation shaft, and pinching both ends of the roller between the two shafts, or by hooking both ends of the roller to the corresponding two shafts. By stopping the support shaft and urging the support shaft to move in a direction away from the rotation shaft by the elasticity of the elastic member, each of the rollers is supported so as to be able to rotate integrally with the rotation shaft, and the rotation of each roller causes the rotation of the support shaft to move away from the rotation shaft. A roller breakage detection device for a roller hearth kiln that continuously bakes a product to be baked placed on a roller while conveying it in one direction, wherein each of the support shafts is formed of a conductive material and held at a fixed position. A detecting section is provided, and a conductive wire that can be hit by each detecting section is stretched in front of each detecting section in the movement urging direction by the elastic member, and the conductive wire and the support shaft are connected to both poles of a power source. A roller breakage detection device for a roller hearth kiln, characterized in that the conductive wire and the detection section form a detection circuit that constitutes a normally open switch by connecting the conductive wire to the detector, and a display means is interposed in the detection circuit.