JP3355810B2 - Roller breakage detector for continuous heat treatment furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous heat treatment furnace used for firing ceramic parts and the like, which is used to detect the presence or absence of a broken roller for conveying a material to be fired. Related to the device.

[0002]

2. Description of the Related Art Generally, a continuous heat treatment furnace used for firing ceramic parts and the like has a structure shown in FIG.

[0003] This continuous heat treatment furnace has a firing passage b formed through the inside of a furnace body a, and a number of rollers c for conveying an object to be fired are arranged along the firing passage b. .
Further, heaters d are provided at the ceiling and the bottom of the firing passage b, respectively.

Each roller c has both ends extending to the outside of the furnace body a, and both ends are rotatably supported by a bearing e and a roller wheel f. And
A sprocket wheel g is attached to one end of each roller c, and the sprocket wheel g is connected to a drive source such as a motor (not shown) via a chain h.

Then, each roller c is rotationally driven by a driving source via a chain h, and along with this, a case j mounted on the roller c is conveyed along a baking passage b. The object to be fired (not shown) stored in the case j is fired by the heater d.

[0006] In the continuous heat treatment furnace having such a configuration, the inside of the sintering passage b is 1200 mm by the heater d.
Each roller c is maintained at a high temperature of about 1400 ° C.
In some cases, a heat-resistant ceramic material is used as the material of the roller c.
Under the influence of the deterioration, eccentricity, load of the material to be fired, etc. due to the heat history, the material may be broken unexpectedly during firing.

[0007] Once the roller c is broken, the object to be fired cannot be conveyed, which hinders the firing process. Therefore, when the roller c is broken, it is detected immediately and the firing operation is stopped. It is necessary to replace and repair the roller c.

Therefore, conventionally, a device having a configuration as shown in FIG. 7 is provided to detect whether or not the roller is broken.

The roller breakage detecting device shown in FIG. 7 is of a photoelectric sensor type. Each roller c has a light passing portion k formed by cutting one end of the roller c by substantially a semicircle. The light emitting part m and the light receiving part n are the light passing parts k of each roller c.
Through each other so as to face each other.

In this apparatus, when the rollers c are rotated synchronously, as shown in FIG. 8, in a normal state in which the rollers c are not broken, light from the light emitting section m is emitted for each rotation of the rollers c. The light passes through all the light passing portions k of c and is received by the light receiving portion n. Therefore, a detection pulse corresponding to the rotation cycle T of the roller c is generated from the light receiving section n.

On the other hand, if one of the rollers c is broken,
Since the broken roller c stops rotating and does not rotate synchronously with the other remaining rollers c, the light from the light emitting unit m is blocked by the outer periphery of the broken roller c and is not received by the light receiving unit n. As a result, a detection pulse synchronized with the rotation cycle T of the roller c cannot be obtained from the light receiving section n, and thereby, the breakage of the roller c is detected.

[0012]

The roller breakage detecting device having the above structure can detect the presence or absence of breakage of the roller with a relatively simple structure, but has the following problems.

That is, when the detection pulse synchronized with the rotation cycle T of the roller c cannot be obtained from the light receiving portion n, it is known that one of the many rollers c is broken. It is difficult to identify what c is. Therefore, an operation for specifying the broken roller c is required separately, which is troublesome.

Further, as shown in FIG. 7, the light passing portion k of the broken roller c is accidentally stopped in an upward state, and the light from the light emitting portion m is blocked by the outer periphery of the broken roller c. Without passing through the roller c
Roller c
To obtain a detection pulse synchronized with the rotation cycle T of
There is a disadvantage that the breakage cannot be detected.

[0015] As a measure to solve these problems,
An image processing device may be provided to monitor the presence or absence of breakage of each roller c, or a protrusion may be provided on a part of the outer peripheral portion of each roller c, and the protrusion may come into contact with the rotation of each roller c. By providing a micro switch that separates and turning on and off the micro switch by the rotation of the roller c, a device that obtains a detection pulse and detects the presence or absence of breakage of the roller, furthermore, a photoelectric switch is provided for each roller. It may be provided individually.

However, when the image processing apparatus is used, it becomes expensive, and a large space must be secured for installing the apparatus, and the installation place is limited. Further, it is necessary to monitor the condition of the roller c in the firing passage b of the continuous heat treatment furnace. However, since the ambient temperature is high, there is also a problem in reliability depending on the temperature of the imaging portion.

In the case of using the microswitch or the photoelectric switch, the ambient temperature in the vicinity of the furnace becomes relatively high even if it is arranged outside the furnace body a of the continuous heat treatment furnace. Therefore, reliability due to the temperature of the electronic component becomes a problem, and when the number of rollers c is large, the cost increases accordingly.

The present invention has been made in order to solve such a problem, and it is possible to individually break each roller in a continuous heat treatment furnace with a relatively simple structure without increasing the cost. It is another object of the present invention to enable reliable detection.

[0019]

In order to solve the above-mentioned problems, the present invention employs the following structure as a roller breakage detecting device for a continuous heat treatment furnace.

That is, in the present invention, at least one end of each roller located outside the furnace body is provided with an electrode portion on a part of the outer peripheral surface thereof. On the other hand, a contact unit that contacts the outer peripheral surface on the part forming side is arranged, and each contact unit has a detection unit that detects electrical conduction and non-conduction through the electrode unit and the contact unit with the rotation of each roller. Connected and configured.

[0021]

According to the above construction, in the normal state, one of the rollers
Each time the contact comes into contact with the electrode formed on the outer peripheral surface of the roller, the two contacts are electrically connected. Therefore, the detecting means detects the electrical connection in synchronization with the rotation cycle of the roller. I do.

On the other hand, if one of the rollers breaks, the broken roller c stops rotating or has an irregular rotation cycle. Cannot be detected, thereby detecting the breakage of the roller.

[0023]

FIG. 1 is a configuration diagram of a roller breakage detecting device of a continuous heat treatment furnace according to an embodiment of the present invention, FIG. 2 is an enlarged perspective view showing a sensor portion of the device, and FIG. Side part,
FIG. 4 is a front view of the sensor unit.

The roller breakage detecting apparatus 1 of this embodiment includes a plurality of rollers 2 for conveying the object to be fired disposed along the firing path of the continuous heat treatment furnace, each end of which is located outside the furnace body. The electrode portion 3 is formed on a part of the outer peripheral surface on the side. The electrode portion 3 is formed, for example, by applying a conductive paste and then baking.

The roller 2 itself is made of a heat-resistant ceramic in order to keep the inside of the furnace at a high temperature, and is electrically non-conductive.

On the other hand, each roller 2 is provided with a pair of contacts 4 which come into contact with the outer peripheral surface on the side where the electrode portion 3 is formed. Each of these contacts 4 is made of a conductive and springy material (for example, phosphor bronze, stainless steel, or the like), and is attached to a fixing tool 5 attached to a part of a side wall of a furnace body (not shown). It is fixed at 6.

A lead wire 7 is connected to the set screw 6 by fusing, soldering, or the like, so that electrical conduction between the lead wire 7 and the contact 4 is achieved.

Further, the lead wires 7 are individually connected to a current detector 8 as a detecting means for detecting electrical conduction and non-conduction through the electrode portion 3 and the contact 4 with the rotation of each roller 2. It is connected.

Reference numeral 10 denotes a controller which receives a detection pulse output from each current detector 8 and monitors whether or not the roller 2 is broken. Reference numeral 12 denotes an alarm when the controller 10 detects that the roller 2 is broken. It is an alarm that emits.

As the controller 10, a microcomputer or the like is applied, and as the alarm 12, a display for displaying a number corresponding to the broken roller 2 is applied.

Next, a description will be given of a roller breakage detecting operation of the roller breakage detecting device 1 having the above configuration with reference to a timing chart shown in FIG.

Now, in a normal state in which all the rollers 2 are not broken at all, the contact 4
Contact the electrode portion 3 on the outer peripheral surface of the roller.
3 electrically conducts.

According to the conduction, the current detector 8 outputs
A detection pulse synchronized with the rotation cycle T of the roller 2 is output. For example, as shown in FIG. 5, when none of the four rollers is broken, as shown in FIGS. A detection pulse is generated.

The controller 10 controls each current detector 8
Is input, and if the period of the detection pulse coincides with the rotation period T of the roller 2, each roller 2 is determined to be normal. Therefore, the alarm 12
Does not work at all.

On the other hand, if one of the rollers 2 breaks,
Since the broken roller 2 stops rotating or has an irregular rotation cycle, a detection pulse synchronized with the rotation cycle T of the roller 2 is output from the current detector 8 corresponding to the broken roller 2. Disappears. For example, as shown in FIG. 5, when one of the four rollers breaks,
As shown in (c), from the time when the roller 2 is broken, no detection pulse is generated for the roller 2 in accordance with the rotation period T.

The controller 10 has one current detector 8
When the period of the detection pulse from the sensor 2 does not match the rotation period T of the roller 2, the roller 2 corresponding to the current detector 8
Is determined to be broken, and the number corresponding to the broken roller 2 is displayed on the alarm 12. As a result, it is possible to immediately know which one of the many rollers 2 has broken.

In this embodiment, the presence or absence of breakage of the rollers 2 is centrally controlled by the controller 10, but the current detectors 8 provided for the respective rollers 2 are individually buzzed or displayed. It is also possible to connect a lamp or the like so that the breakage of the roller 2 is notified.

[0038]

According to the present invention, the following effects can be obtained.

(1) Since it is a method of detecting by contact,
Despite having a relatively simple configuration, malfunctions are less likely to occur even when the ambient temperature is high or dust is present.

Therefore, even when the rollers are mounted on a large number of rollers, it is possible to reliably detect the presence or absence of breakage of each roller at low cost as a whole.

Further, since the configuration is simple, it can be incorporated in a conventional space as it is, and the installation place of the apparatus is hardly restricted as in the conventional case.

(2) Even when there are many rollers,
Since broken rollers can be easily identified from among them, it is possible to construct a system for easily and centrally monitoring the presence or absence of breakage of each roller even at a location remote from the site. In addition, there is no need to rotate the rollers synchronously.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a roller breakage detecting device of a continuous heat treatment furnace according to an embodiment of the present invention.

FIG. 2 is an enlarged perspective view showing a sensor part of the apparatus of FIG. 1;

FIG. 3 is a side view of a sensor part of FIG. 2;

FIG. 4 is a front view of a sensor part of FIG. 2;

FIG. 5 is a timing chart of detection pulses obtained when the presence or absence of breakage of a roller is checked by the apparatus of FIG. 1;

FIG. 6 is a sectional view showing a structure of a continuous heat treatment furnace.

FIG. 7 is a configuration diagram of a conventional roller breakage detection device provided in a continuous heat treatment furnace.

FIG. 8 is a timing chart of a detection pulse obtained when checking the presence or absence of breakage of a roller by the apparatus of FIG. 7;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Roller breakage detection device, 2 ... Roller, 3 ... Electrode part, 4
... contact, 8 ... detecting means (current detector).

Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI G01M 19/00 G01M 19 / 00Z (56) References JP-A-4-124587 (JP, A) JP-A-52-56112 (JP, A JP-A-5-172466 (JP, A) JP-A-3-194388 (JP, A) JP-A-6-14900 (JP, U) JP-B-56-14951 (JP, B2) JP-B-45 34305 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) F27B 9/24 F27B 9/40 B65G 13/02 B65G 43/06 G01B 7/00 G01M 19/00

Claims (1)

(57) [Claims] 1. A method in which a number of rollers for conveying an object to be fired are provided along a firing path formed in a furnace body, and each roller has both ends extended to the outside of the furnace body and is driven to rotate by a drive source. An apparatus for detecting the presence or absence of breakage of the rollers for the continuous heat treatment furnace, wherein at least one end of each of the rollers located outside the furnace body has an electrode on a part of its outer peripheral surface. Forming a contact portion, and for each of the rollers, a contact that contacts the outer peripheral surface on the electrode portion forming side is arranged, while the contact portion has an electrode portion associated with the rotation of each of the rollers And a detecting means for detecting electrical continuity and non-conduction through a contact, and a roller breakage detecting device for a continuous heat treatment furnace.