JP4985923B2 - Firing furnace - Google Patents

Description

  The present invention relates to a firing furnace.

  There is a rotary kiln (rotary continuous firing furnace) as one of the firing furnaces in which a material to be fired is accommodated in a furnace core tube and conveyed while being heated. The rotary kiln feeds the powder to the other end side of the furnace core tube by supplying the powder as the material to be fired from one end side of the furnace core tube arranged at an inclination and rotating the furnace core tube. In the conveying process, the powder is heated and fired.

Further, in the furnace core tube, the circumferential movement of the object to be fired accompanying the rotation is performed centering on a portion where a portion accumulated at a so-called repose angle or more gradually collapses due to its own weight. Therefore, in a conventional rotary kiln, a stirring blade is extended from the inner peripheral wall of the furnace core tube, and the material to be fired is actively stirred as the furnace core tube rotates to improve the firing efficiency. There is also (refer patent document 1).
JP-A-8-110164

  However, in a firing furnace represented by a conventional rotary kiln, due to the use with heating, the material to be fired may adhere to the inner peripheral wall surface of the furnace core tube. There is concern about the decline.

  In addition, with the stirring blade in the rotary kiln described in Patent Document 1 described above, even if the material to be fired can be stirred, no action can be given to the material to be fired once adhered.

  Furthermore, it is possible to add a dedicated mechanism only for removing the adherend to be fired separately from the stirring blade, but in that case, the configuration in the furnace core tube is cluttered and suitable. In addition, troublesome studies such as prevention of interference between the stirring blade and the adhesion removing mechanism are also required.

  The present invention has been made in view of such points, and both the stirring of the object to be fired and the scraping of the deposits were carried out using a simpler structure with respect to the inside of the furnace core tube, thereby improving the firing efficiency. An object of the present invention is to provide a firing furnace that can be achieved.

  In order to solve the above-described problems, in the firing furnace according to the present invention, a furnace core tube that is disposed on the installation base surface and accommodates an object to be fired, and inside the furnace core tube, from one end side of the furnace core tube A stirring / scraping member extending toward the other end, the stirring / scraping member being provided so as to be relatively movable with respect to the core tube, and rotating with respect to the installation base surface It is provided as possible.

  The furnace tube is rotatably supported with respect to the installation base surface, the stirring / scraping member is composed of a chain member, and the firing furnace supports the chain member. A bracket may be provided to be rotatable with respect to the installation base surface.

  Alternatively, the furnace core tube is supported so as to be rotatable with respect to the installation base surface, and the stirring / scraping member is composed of a rod-shaped member or a plate-shaped member. A bracket for supporting the member or the plate-like member is provided so as to be rotatable with respect to the installation base surface, and the bracket is configured such that the rod-like member or the plate-like member is movable by its own weight. The shaped member may be supported.

  In the above, the bracket may be provided integrally with the core tube so as to rotate together with the core tube, or rotate in a direction opposite to the core tube, or with the core tube You may provide so that it may rotate at a different speed in the same direction.

  Alternatively, the furnace tube is fixedly supported with respect to the installation base surface, the stirring / scraping member is composed of a chain member, and the chain member is provided in the firing furnace. The bracket to support may be provided so that rotation with respect to the said installation base surface is possible.

  Alternatively, the furnace tube is fixedly supported with respect to the installation base surface, and the stirring / scraping member is composed of a rod-like member or a plate-like member. The bracket which supports a member or a plate-shaped member may be provided rotatably with respect to the installation base surface.

  In the above, the bracket may support the rod-like member or the plate-like member in a mode in which the connecting portion of the rod-like member or the plate-like member is movable by its own weight.

  The furnace core tube may be made of ceramic.

  According to the present invention described above, both the agitation of the object to be fired and the scraping of the deposits can be carried out using a simpler structure with respect to the inside of the furnace core tube, and the firing efficiency can be improved.

  The other features of the present invention and the operational effects thereof will be described in more detail with reference to the accompanying drawings.

  Hereinafter, embodiments of a firing furnace according to the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals indicate the same or corresponding parts.

Embodiment 1 FIG.
FIG. 1 shows a side surface of a rotary kiln (rotary continuous firing furnace) according to Embodiment 1 of the present invention. The rotary kiln 1 mainly includes a reactor core tube 5 disposed on an installation base surface 3 such as a floor surface of a production facility, and a stirring / scraping member 7 provided in the reactor core tube 5.

  The core tube 5 is a long cylindrical member extending in the axial direction, and more specifically, is a cylindrical member whose inner and outer shapes are circular in a longitudinal section with the axial direction as a perpendicular. The core tube 5 is made of ceramic.

  The core tube 5 is rotatably provided in a manner in which the axis CL is inclined with respect to the horizontal direction via an inclined table 13 and bearing means 15 arranged on the installation base surface 3. As an aspect of the inclination, the inlet end 5a of the object to be fired in the furnace core tube 5 is positioned vertically above the outlet end 5b of the object to be fired. In addition, about the structure of the bearing means 15, an installation position, the number of installation, etc., it is possible to select suitably.

  A firing object supply unit 17 is connected to the inlet end 5 a of the core tube 5. On the other hand, the outlet end 5b of the core tube 5 is opened, and a recovery unit 19 for recovering the material to be fired is provided below the outlet end 5b. Further, a heating unit 21 for heating and baking the object to be fired is provided above the core tube 5, and the core tube 5 is driven to rotate below the core tube 5 via the bearing means 15. These motors are provided as the drive unit 23. It should be noted that the specific configuration, installation position, number of installations, and the like regarding the heating unit 21 and the drive unit 23 can be selected as appropriate.

  An annular bracket 25 is provided at each of the inlet end 5 a and the outlet end 5 b of the core tube 5. The bracket 25 is provided integrally with the core tube 5 so as to rotate together with the core tube 5. The stirring / scraping member 7 is attached to the bracket 25.

  The stirring / scraping member 7 extends from one end (inlet end 5a) side to the other end (outlet end 5b) side of the core tube 5 inside the core tube 5. In this embodiment, the stirring / scraping member 7 is composed of at least one chain member, and as a specific example, the stirring / scraping member 7 is composed of four chain members 7a, 7b, 7c, 7d. Explain that it is. This will be described in more detail with reference to FIGS. FIG. 2 is a view showing the inside of the core tube 5 and the chain members 7a to 7d in such a direction that the axial center direction of the core tube 5 is a perpendicular to the paper surface. One end of each chain member 7a, 7b, 7c, 7d is supported by the bracket 25 on the inlet end 5a side of the core tube 5, and the other end is supported by the bracket 25 on the outlet end 5b. The chain members 7a, 7b, 7c, and 7d are made of ceramic.

  The chain members 7a, 7b, 7c, and 7d are supported in a manner that they are separated by approximately 90 degrees so as to be equally spaced from each other. This is merely an example, and the intervals can be non-uniform.

  The lengths of the chain members 7a, 7b, 7c, and 7d are set to be longer than the distance between the support portions of the pair of brackets 25, whereby the chain members 7a, 7b, 7c, and 7d correspond to each other. In such a position, it is slackened by the influence of its own weight and hangs down in the core tube 5. It should be noted that the length of each chain member, that is, the amount of slack can be appropriately modified and implemented.

  Next, the operation of the rotary kiln having such a configuration will be described. The core tube 5 is rotationally driven with respect to the installation base surface 3 by the bearing means 15 and the drive unit 23 as indicated by reference numeral R1 in the figure. An object to be fired 27 is charged into the rotating core tube 5 through the supply unit 17. The to-be-fired object 27 is gradually conveyed in the core tube 5 from the inlet end 5a toward the outlet end 5b by the rotating action of the core tube 5 and the inclination of the core tube 5. During this time, the object to be fired 27 is fired by heating from the heating unit 21. The fired product 27 is discharged from the outlet end 5 b of the furnace core tube 5 and is collected by the collection unit 19.

  Here, in the furnace core tube, since the movement of the object to be fired must rely on its own weight, the object to be fired may not change its position greatly between the inner wall surface side and the center side of the furnace core tube. There is a possibility that sufficient heating efficiency cannot be obtained. Moreover, a to-be-fired thing may adhere to the inner peripheral wall surface of a furnace core pipe, and there is a possibility that sufficient firing efficiency cannot be obtained as it is. However, in the rotary kiln 1 according to the present embodiment, these problems can be solved together by using the stirring / scraping member 7.

  As described above, the stirring / scraping member 7 is configured as a chain member 7 a, 7 b, 7 c, 7 d, and is connected to a bracket 25 provided on the rotating core tube 5. For this reason, the agitation / scraping member 7 exerts a scraping action on the inner peripheral wall surface of the core tube 5 by moving relative to the core tube 5 and rotates with respect to the installation base surface 3. Thus, the stirring action can be exerted on the object 27 in the furnace core tube 5.

  More specifically, as shown in FIG. 2, the chain member 7c located at the lower position in the core tube 5 then passes through the illustrated position of the chain member 7d and then the chain member 7a located at the upper position. The to-be-fired product 27 can be stirred by moving while the to-be-fired product 27 is entangled before reaching the illustrated position. Further, the chain member 7c in the lower position is in contact with the inner peripheral wall surface of the core tube 5 at least before reaching the illustrated position of the chain member 7d and is irregular because it is chain-shaped. The line is curved and bent to perform relative sliding with respect to the inner peripheral wall surface, thereby preventing the object 27 from adhering to the inner peripheral wall surface, Scraping can be performed.

  Further, the chain member 7a at the upper position in the core tube 5 passes through the illustrated position of the chain member 7b until the chain member 7c at the lower position reaches the illustrated position. The object to be fired 27 can be stirred by moving while the fired object 27 is entangled. Further, the chain member 7a located at the upper position continuously bends and bends because of the chain shape until at least the chain member 7b reaches the illustrated position, so that the inner wall surface of the core tube 5 is not bent. Regular contact and separation are repeated, that is, knocking is performed on the inner peripheral wall surface. By this knocking motion, vibration is imparted to the inner peripheral wall surface, and removal of deposits on the inner peripheral wall surface can be promoted. Furthermore, the chain member 7b shown in the figure is in contact with the inner peripheral wall surface of the reactor core tube 5 until reaching the position shown in the figure of the chain member 7c, and because of the chain shape, the lines are irregularly formed every moment. By bending / bending, the inner peripheral wall surface is slid relative to the inner peripheral wall surface, thereby preventing the object 27 from adhering to the inner peripheral wall surface or scraping off the already-adhered object 27 to be fired. It can also be done. In addition, the above description is an illustration to the last, and the effect | action of the chain member of each position may differ a little from the said description by the number of chain members, the amount of slack, the quantity, shape, size, etc. of to-be-fired material.

  In this way, in the present embodiment, the stirring / scraping member 7 can both stir the object to be fired 27 and scrape deposits on the inner peripheral wall surface of the core tube 5. At that time, the stirring / scraping member 7 only bridges the inside of the furnace core tube 5 and uses only its own weight and irregular constant deformation due to its chain shape. With a simple configuration, both the stirring effect and the scraping effect of the deposit are obtained. Further, since the agitating means and the scraping means are not separately provided in the core tube 5, the inside of the core tube 5 is not cluttered, and the operation interference of the separate means is caused. There is no need to worry.

  Moreover, if the rotary kiln is used for temporary firing of ceramic raw materials such as barium titanate-based dielectric materials and lead zirconate titanate-based piezoelectric materials, it becomes an extremely effective utilization mode from the viewpoint of improving production efficiency. Here, when a furnace core tube is made of a general heat-resistant alloy such as SUS, the ceramic powder to be fired is contaminated by the material constituting the furnace core tube, so a high-quality calcined ceramic raw material It has become difficult to get. In the present embodiment, since the furnace core tube 5 and the stirring / scraping member 7 are made of ceramic, even if ceramic powder is selected as the material to be fired 27, the above-described contamination problem does not occur.

  On the other hand, when the core tube is made of ceramic, it is very difficult in the ceramic manufacturing process to provide an extension as a part of the core tube or as a separate body on the inner peripheral wall of the core tube. . However, in this embodiment, since the stirring / scraping member is not directly provided on the inner peripheral wall of the core tube, in order to obtain both the stirring effect and the scraping effect with a simple configuration, the core tube 5 and the stirring / scraping member are not provided. It is possible to adopt a mode in which the scraping member 7 is made of ceramic without any problem.

  In addition, when the core tube is made of ceramic when the core tube is vibrated by the knocking motion to obtain the effect of removing the deposits, it is not preferable in terms of strength. However, in the present embodiment, the knocking motion can be obtained by appropriate contact using the self-weight and the irregular constant deformation due to the chain shape. For this reason, in addition to obtaining both the stirring effect and the scraping effect with a simple configuration, the action of removing the deposits is a preferred mode for a ceramic core tube.

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described. In FIG. 3, the modified part with respect to Embodiment 1 of the baking furnace which concerns on this Embodiment is shown. In the present embodiment, the core tube 5 is fixedly supported with respect to the installation base surface 3 by the support legs 115 and the inclined base 13. A bracket 125 for supporting the stirring / scraping member 7 is provided in the vicinity of the inlet end 5a and the outlet end of the core tube 5 (the outlet end side is not shown). The bracket 125 is separate from the fixed core tube 5 and can be moved relative to the core tube 5, and is indicated by a reference symbol R <b> 2 with respect to the installation base surface 3 by the drive unit 123 and the bearing means 123 a. It is provided rotatably.

  With such a configuration, also in the firing furnace 101 according to the present embodiment, the agitating / scraping member 7 moves relative to the furnace core tube 5 and rotates relative to the installation base surface 3. Therefore, the above-described operational effects relating to the first embodiment can be obtained similarly.

Embodiment 3 FIG.
Next, a third embodiment of the present invention will be described. FIG. 4 shows a modified portion of the rotary kiln according to the present embodiment with respect to the first and second embodiments. In the present embodiment, the core tube 5 is provided so as to be rotatable with respect to the installation base surface 3 via the inclined base 13 and the bearing means 15 arranged on the installation base surface 3. A stirring / scraping member 207 extending from one end (inlet end 5a) side to the other end (outlet end 5b) side of the core tube 5 is provided in the core tube 5. In the vicinity of the inlet end 5 a and the outlet end of the core tube 5, a bracket 225 that supports the stirring / scraping member 207 is provided. The bracket 225 is provided integrally with the core tube 5 so as to rotate together with the core tube 5 (the outlet end side is not shown), that is, is provided rotatably with respect to the installation base surface 3. Yes.

  FIG. 5 is a view showing the bracket 225 and the agitation / scraping member 207 in such a direction that the axial center direction of the core tube 5 is a perpendicular to the paper surface. In this embodiment, the stirring / scraping member 207 is composed of at least one or more rod-shaped members. As shown in FIGS. 4 and 5, as a specific example, four rod-shaped members 207a, The description will be made assuming that 207b, 207c, and 207d are configured. In addition, as the stirring / scraping member 207, a plate-like member having a width larger than the height can be used.

  One end of each of the rod-like members 207a, 207b, 207c, and 207d is supported by a bracket 225 on the inlet end 5a side of the core tube 5, and the other end is configured in the same manner as an outlet end bracket (not shown). ) Is supported. The rod-shaped members 207a, 207b, 207c, and 207d are made of ceramic.

  Each bracket 225 is formed in an annular shape, and four long holes 225a, 225b, 225c, and 225d are formed corresponding to the four rod-shaped members. The long holes 225a, 225b, 225c, and 225d are arc-shaped holes that extend in the same angular range, and are supported in a manner that they are separated from each other by approximately 90 degrees so as to be equally spaced from each other at the center. Yes. This is merely an example, and the intervals can be non-uniform.

  The rod-like members 207a, 207b, 207c, and 207d are movably supported by inserting both end portions thereof into the corresponding long holes 225a, 225b, 225c, and 225d of the pair of brackets 225. That is, as illustrated by the one-dot chain line arrow of FIG. On the other hand, that is, in the present embodiment, it can move relative to the core tube 5.

  With this configuration, also in the rotary kiln 201 according to the present embodiment, the agitating / scraping member 7 moves relative to the core tube 5 and rotates relative to the installation base surface 3. The rod-like members 207a, 207b, 207c, and 207d can exert the scraping action of the deposits on the inner peripheral wall surface of the core tube 5 by moving relative to the core tube 5, and the installation base surface 3 The stirring action can be exerted on the object to be fired 27 in the core tube 5 by rotating with respect to. Therefore, the above-described operational effects relating to the first and second embodiments can be obtained in the same manner.

Embodiment 4 FIG.
Next, a fourth embodiment of the present invention will be described. FIG. 6 shows a modified portion of the firing furnace according to the present embodiment with respect to the first to third embodiments. In the present embodiment, the core tube 5 is fixedly supported with respect to the installation base surface 3 by the support legs 115 and the inclined base 13. Further, a bracket 225 for supporting the stirring / scraping member 207 is provided in the vicinity of the inlet end 5a and the outlet end of the core tube 5 (the outlet end side is not shown). The bracket 225 is separate from the fixed core tube 5 and can be moved relative to the core tube 5, and is indicated by a reference symbol R <b> 2 with respect to the installation base surface 3 by the drive unit 123 and the bearing means 123 a. It is provided rotatably. The configuration related to the bracket 225 and the stirring / scraping member 207 is the same as that of the third embodiment, and the bracket 225 includes the long holes 225a, 225b, 225c, 225d and the stirring / scraping member. Reference numeral 207 includes rod-shaped members 207a, 207b, 207c, and 207d.

  With such a configuration, also in the firing furnace 301 according to the present embodiment, the agitating / scraping member 207 moves relative to the furnace core tube 5 and rotates relative to the installation base surface 3. Therefore, the above-described operational effects related to the first to third embodiments can be obtained in the same manner.

  In the present embodiment, the use of the bracket 225 having a long hole is not limited, and the agitation / scraping member 207 may be fixedly attached to the bracket. It is also possible to realize relative movement with respect to the core tube 5 and rotational movement with respect to the installation base surface 3.

  Although the contents of the present invention have been specifically described with reference to the preferred embodiments, various modifications can be made by those skilled in the art based on the basic technical idea and teachings of the present invention. It is self-explanatory.

  For example, in the above-described embodiment, the bracket, that is, the stirring / scraping member is configured to rotate with respect to the fixed core tube or to rotate at the same rotational speed in the same direction as the rotating core tube. It had been. However, the present invention is not limited to this, and the stirring / scraping member rotates in the opposite direction to the rotating core tube, or rotates at a different rotational speed in the same direction. It may be configured.

It is a side view of the rotary kiln which concerns on Embodiment 1 of this invention. It is a figure which shows the stirring and scraping member in the furnace core tube in the rotary kiln of FIG. It is a partial side view of the baking furnace which concerns on Embodiment 2 of this invention. It is a partial side view of the rotary kiln which concerns on Embodiment 3 of this invention. It is a figure which shows the bracket and stirring / scraping member in the rotary kiln of FIG. It is a partial side view of the baking furnace which concerns on Embodiment 4 of this invention.

Explanation of symbols

1,201 Rotary kiln (firing furnace)
5 Core tube 7,207 Stirring / scraping member 25, 125, 225 Bracket 101, 301 Firing furnace

Claims (6)

A core tube that is disposed on the installation base surface and contains an object to be fired;
A stirring / scraping member extending from one end side to the other end side of the core tube inside the core tube;
The stirring / scraping member is provided in a relatively movable manner with respect to the furnace core tube, and is a firing furnace provided in a rotatable manner with respect to the installation base surface ,
The furnace core tube is rotatably supported with respect to the installation base surface,
The stirring / scraping member is composed of a chain member,
Furthermore, the firing furnace is provided with a bracket that supports the chain member so as to be rotatable with respect to the installation base surface.
The bracket is provided to rotate in a direction opposite to the core tube, or to rotate at a different speed in the same direction as the core tube.
Firing furnace. A core tube that is disposed on the installation base surface and contains an object to be fired;
A stirring / scraping member extending from one end side to the other end side of the core tube inside the core tube;
The stirring / scraping member is provided in a relatively movable manner with respect to the furnace core tube, and is a firing furnace provided in a rotatable manner with respect to the installation base surface,
The furnace core tube is rotatably supported with respect to the installation base surface,
The stirring / scraping member is composed of a rod-shaped member or a plate-shaped member,
Further, the firing furnace is provided with a bracket that supports the rod-like member or plate-like member so as to be rotatable with respect to the installation base surface ,
The bracket supports the rod-like member or plate-like member in a manner in which the rod-like member or plate-like member can be moved by its own weight, and rotates in a direction opposite to the reactor core tube, or in the same direction as the reactor core tube. Provided to rotate at different speeds,
Firing furnace. A core tube that is disposed on the installation base surface and contains an object to be fired;
A stirring / scraping member extending from one end side to the other end side of the core tube inside the core tube;
The stirring / scraping member is provided in a relatively movable manner with respect to the furnace core tube, and is a firing furnace provided in a rotatable manner with respect to the installation base surface,
The furnace tube is fixedly supported with respect to the installation base surface,
The stirring / scraping member is composed of a chain member,
Furthermore, the firing furnace is provided with a bracket that supports the chain member so as to be rotatable with respect to the installation base surface.
Firing furnace A core tube that is disposed on the installation base surface and contains an object to be fired;
A stirring / scraping member extending from one end side to the other end side of the core tube inside the core tube;
The stirring / scraping member is provided in a relatively movable manner with respect to the furnace core tube, and is a firing furnace provided in a rotatable manner with respect to the installation base surface,
The furnace tube is fixedly supported with respect to the installation base surface,
The stirring / scraping member is composed of a rod-shaped member or a plate-shaped member,
Furthermore, the firing furnace is provided with a bracket that supports the rod-like member or plate-like member so as to be rotatable with respect to the installation base surface.
Firing furnace. 5. The firing furnace according to claim 4, wherein the bracket supports the rod-like member or the plate-like member in such a manner that the connecting portion of the rod-like member or the plate-like member can move by its own weight. The firing furnace according to any one of claims 1 to 5, wherein the furnace core tube is made of ceramic.

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