JP3230296B2 - Rotary 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 rotary heat treatment furnace used for heat treatment of an object such as a ceramic raw material.

[0002]

2. Description of the Related Art Conventionally, when synthesizing a ceramic raw material, it has been common practice to perform a drying treatment of a raw material slurry containing water and then perform a calcination treatment of the obtained ceramic powder. In the drying treatment, a box-shaped sagger into which raw material slurry as an object to be treated is injected is heated by a batch-type heat treatment furnace or a pusher-type continuous heat treatment furnace having a well-known structure. In addition, the dried ceramic powder as the object to be processed is calcined by heating in another pusher-type continuous heat treatment furnace or a retort-type continuous heat treatment furnace. The synthesis of the ceramic raw material is completed.

[0003] Here, when calcination treatment is performed using a pusher type continuous heat treatment furnace, the ceramic powder is transferred to another sagger, while when the retort type continuous heat treatment furnace is used, the ceramic powder is transferred. The obtained ceramic powder is charged into a retort. Further, since the ceramic raw material obtained by this calcining treatment is often in a state of being hardly aggregated to some extent, it is a normal procedure to grind the calcined ceramic raw material by a ball mill or the like. I have.

[0004]

By the way, in the heat treatment of an object to be processed in accordance with the procedure of the above-mentioned conventional example, for example, drying, calcination, and pulverization at the time of synthesizing a ceramic raw material are performed separately. For this reason, the labor and time required for setting up each process increase, which leads to an increase in manufacturing cost. In addition, in the above-described procedure, there are many opportunities to move an object to be processed such as a ceramic powder between the heat treatment facilities, so that a foreign object or an impurity is mixed into the moving object to be processed. Inconvenience of deterioration has also occurred.

Further, since a retort-type continuous heat treatment furnace or the like is usually used exclusively for an object to be treated having a specific component, it is very difficult to adjust equipment required each time the object to be treated is changed. Inconvenience that it takes time and effort is also occurring.

The present invention has been made in view of these inconveniences, and enables drying, calcination, and pulverization of a ceramic raw material to be processed as a continuous series of processes. The purpose of the present invention is to provide a rotary heat treatment furnace that can easily cope with a change in the processed material.

[0007]

In order to achieve the above object, a rotary heat treatment furnace according to the present invention comprises a horizontally disposed furnace core, and a furnace body outer wall disposed around the periphery thereof. In the furnace space surrounded by, a plurality of processing zones that are separated from each other via partition walls that are spaced apart along the circumferential direction of the furnace core, and that are different from each other in the set processing conditions. On the other hand, a plurality of container holders arranged via a partition plate along a circumference in a vertical direction centering on the axis of the furnace core, and horizontally holding a raw material container storing an object to be processed. A first rotation driving means for revolving the revolving frame with the axis center as a rotation center point, and a rotating frame for rotating each of the raw material containers horizontally held by the container holding portion. 2
Rotation driving means.

[0008]

According to the above construction, the revolving frame is revolved by the revolving drive means, and each of the raw material containers held by the container holding portion of the revolving frame is provided with the inside of the furnace space partitioned. It moves while sequentially passing through the inside of each of the processing zones. Therefore, if each processing zone is set as mutually different processing conditions, and is divided into, for example, a raw material inflow / outflow zone, a drying zone, a calcining zone, and a slow cooling zone, in the raw material outflow / incoming zone, the revolving frame has a container holding portion. The loaded raw material container will be moved from the drying zone to the calcining zone and from the calcining zone to the slow cooling zone with the revolving drive of the revolving frame, and the object to be processed stored in this raw material container will be After being processed, it is unloaded from the container holding portion of the revolving frame together with the raw material containers that have arrived again at the raw material entrance / exit zone.

Further, since the raw material container is rotated by the rotation driving means, the object to be processed contained therein is also rotated and stirred together with the raw material container, and the aggregation of the material to be processed hardly occurs. In addition, in this raw material container,
A jig for grinding the workpiece may be stored in advance together with the workpiece.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front sectional view schematically showing the entire structure of a rotary heat treatment furnace according to this embodiment, and FIG.
3 is a side cross-sectional view along the X-ray, FIG. 3 is a partially omitted perspective view showing the state of the orbital drive structure of the revolving frame as viewed from the rear side, and FIG.
Reference numeral 1 in FIGS. 1 and 2 indicates a rotary heat treatment furnace.

A furnace body of the rotary heat treatment furnace 1 is formed into a substantially circular cross-sectional shape by using a heat insulating material, and is provided with a furnace core 2 disposed along a horizontal direction and a periphery of the furnace core 2. And a furnace body outer wall portion 3 made of a heat insulating material having a predetermined thickness disposed outside. Then, in the furnace space surrounded by the furnace core 2 and the furnace body outer wall 3 and having a substantially annular shape in a front view, at substantially uniform positions along the circumferential direction of the furnace core 2, for example, A plurality (four in FIG. 1) of processing zones A to D are provided, which are separated from each other via partition walls 4 spaced apart from each other at 90 ° positions about the axis P of the furnace core 2 as a center point. Have been.

Here, each of the processing zones A to D is set as mutually different processing conditions, and the first processing zone A located below the furnace body constitutes the processing zone A. A plurality of water-cooling tubes 5 are respectively provided on predetermined surfaces of the furnace core 2 and the furnace body outer wall 3, and a raw material container inlet / outlet 3 a penetrating the front side wall of the furnace body outer wall 3 is formed. As a result, it becomes a raw material entry / exit zone. A container pushing-out jig 6 is provided at a position on the rear side wall of the furnace body outer wall portion 3 facing the raw material container inlet / outlet hole 3a, and the container pushing-out jig 6 is provided with a pneumatic pressure installed outside the furnace. It is connected to a telescopic drive means (not shown) such as a cylinder, and is driven to expand and contract along the longitudinal direction of the furnace body. That is,
The first processing zone A is a raw material entrance / exit zone (hereinafter, denoted by A) provided for loading / unloading the raw material container 7 described later.

Further, the second processing zone B, which is located on the clockwise side following the raw material inflow / outflow zone A, that is, on the left side in the front view of FIG. 1, is provided with the furnace core 2 and the furnace body outer wall 3 constituting the second processing zone B. A plurality of heaters 8 controlled to be heated to a predetermined temperature on the surface of the predetermined region are provided, respectively, to form a drying zone (hereinafter, denoted by a reference symbol B), and a third zone located above the furnace body. The processing zone C also has a plurality of heaters 9.
Are arranged in a similar state to form a calcining zone (hereinafter, denoted by reference numeral C). After the calcination zone C, a plurality of heaters are provided on the surface of the predetermined area of the furnace core 2 and the furnace outer wall 3 which constitute the fourth processing zone D located on the right side in the front view of FIG. The treatment zone D is a slow cooling zone (hereinafter, denoted by a symbol D) and is connected to the raw material in / out zone A.

As described above, when the calcining zone C having the highest temperature is arranged at an upper position in the furnace space, thermal effects on other processing zones A, B, and D occur. And the setting conditions in each of the processing zones A to D can be easily maintained. Further, if the furnace interior space is divided into a larger number of processing zones, and each processing zone is constituted by two outer peripheral side heaters and one inner peripheral side heater, fine temperature setting can be performed.

On the other hand, in a furnace space in which the processing zones A to D are provided continuously with each other, a revolving frame 11 having a substantially annular shape in a front view and formed by using a heat-resistant alloy or the like is installed upright. Have been. And this revolving frame 11
A cylindrical shape which is disposed along a vertical circumference centered on the axis P of the furnace core 2 of the furnace body 2 and which horizontally holds the raw material container 7 containing the workpiece, A plurality of (e.g., 12 in FIG. 1) of the container holders 12 are provided, and a partition plate 13 is formed between the container holders 12 along a direction perpendicular to the circumference. ing. That is, each of the container holding portion 12 and the partition plate 13 in the revolving frame 11 is arranged at every 30 ° centered on the axis P of the furnace core 2. Further, a guide portion 14 of a predetermined width extending rearward along the horizontal direction is provided along the outer peripheral edge on the rear surface side of the revolving frame 11, and in the same direction along the inner peripheral edge thereof. The extended gear portions 15 are respectively formed over the entire circumference.

As shown in the revolving drive structure of FIG. 3, a plurality of guide portions 14 provided on the revolving frame 11 are arranged through the rear side wall of the furnace body outer wall portion 3 (in FIG. Three (3) rollers 16 are rotatably supported from the inner peripheral side, and each of the rollers 16 is disposed at substantially equal positions capable of supporting the entire revolution frame 11 in an upright state. Further, the gear portion 15 provided on the same rear surface side is provided with a first rotary driving means 17 such as a stepping motor also installed outside the furnace and a pinion 18.
The rotation driving means 17
Is configured to perform an intermittent rotation operation along the clockwise direction at every 30 ° position about the axis P of the furnace core 2 as a center point. Note that, of course, one of the rollers 16 may be driven by the rotation driving unit 17 without using the pinion 18.

Therefore, the revolving frame 11 is intermittently revolved in the clockwise direction by the rotation driving means 17, and each of the container holding portions 12 holding the raw material containers 7 is centered on the axis P. It will be stopped at every 30 ° position as a point. The partition plate 1 provided between the container holding portions 12 of the revolving frame 11
3, any one of the partition walls 4 that divides the furnace space as the processing zones A to D faces each time the revolution stops, and the partition wall 4 and the partition plate 13 face each other. , Processing zones A to D are partitioned from each other.

Furthermore, the revolving frame 11 passes through each of the drying zone B, the calcining zone C, and the slow cooling zone D provided in the furnace space by being revolved. Each of the raw material containers 7 horizontally held by the container holding unit 12 at positions corresponding to the container holding unit 12 at the time of the revolution stop on the rear side wall of the furnace body outer wall unit 3 constituting the processing zones BD. Second rotation driving means 19 such as a motor for rotating the rotation of the motor when the revolution stops. Each of the rotation driving means 19 includes a pair of container support jigs 20 which are arranged to face each other along the front-rear direction of the furnace body and penetrate the rear side wall of the furnace body outer wall 3. Each of the container support jigs 20 can be moved toward and away from each other by telescopic drive means (not shown) such as a pneumatic cylinder installed outside the furnace.

Therefore, when these container supporting jigs 20 are moved closer to each other when the revolution stops, the raw material container 7 held by the container holding section 12 is sandwiched and supported by the container supporting jig 20. The raw material container 7 sandwiched and supported is rotated by a motor constituting the rotation driving means 19. At this time, since the raw material container 7 rotates on its own axis, the heating state of the raw material container 7 in each of the processing zones B to D becomes uniform, and the temperature distribution of the processing object is improved. Also. In addition, after each rotation of the raw material containers 7 is performed,
The revolving frame 11 is driven to revolve again.

As shown in FIG. 4, a raw material container 7 for storing an object to be processed (not shown) has a cylindrical container 7a having one end closed and a lid 7b having an open end closed. And is formed by using the same material as the sagger in the conventional example. In the raw material container 7, raw material slurry or the like, which is an initial state of the ceramic raw material to be synthesized by the heat treatment, is stored as an object to be processed, and is formed on the front side wall of the furnace outer wall portion 3. The raw material container 7 inserted and held in the container holding portion 12 of the revolving frame 11 through the raw material port 3a circulates in the furnace space with the intermittent revolving of the revolving frame 11, and then the same raw material port 3a.
, And dried and calcined ceramic raw material is taken out of the raw material container 7. Note that a ceramic ball or the like, which is a jig for crushing the workpiece, may be stored in advance in the raw material container 7 together with the workpiece.

Next, the operation of the rotary heat treatment furnace 1 according to this embodiment will be described.

First, the raw material container 7 containing the raw material slurry containing water is inserted into the furnace space through the raw material inlet / outlet hole 3a located in the raw material inlet / outlet zone A, and revolved at the position corresponding to the raw material inlet / outlet hole 3a. Container holding part 1 of frame 11
2 is loaded. Thereafter, as the revolving frame 11 is intermittently driven to revolve, the raw material containers 7 loaded in the container holding portion 12 are moved from the raw material in / out zone A to the drying zone B, and from the drying zone B to the calcination zone C. Then, it moves from the calcination zone C to the annealing zone D. Therefore, the raw material slurry stored in the raw material container 7 is dried during passage through the drying zone B to be a ceramic powder, and is further calcined during passage through the calcination zone C, and the synthesized ceramics is obtained. Raw material.

The raw material container 7 passing through the drying zone B, the calcining zone C, and the annealing zone D is rotated each time the revolving drive is stopped. The material is also rotated and stirred together with the raw material container 7, and as a result, the agglomeration of the material to be processed hardly occurs. At this time, if a ceramic ball or the like is stored in the raw material container 7, aggressive pulverization of the object to be stirred is performed. Further, the raw material container 7 which has passed through the slow cooling zone D and returned to the first raw material in / out zone A is moved from the container holding portion 12 by the operation of the container pushing jig 6 to the raw material in / out hole 3a.
To be loaded and unloaded outside the furnace.

[0025]

As described above, according to the rotary heat treatment furnace of the present invention, it is necessary to separately perform each of drying, calcination, and pulverization at the time of synthesizing a ceramic raw material as an object to be processed. As a result, these processes can be performed as a continuous series of processes. As a result, not only the manufacturing cost can be reduced, but also the characteristic deterioration of the object to be processed due to the contamination of impurities can be reliably prevented. Is obtained. In addition, when the object to be processed is changed, it is only necessary to replace the raw material container, and the effect that the response can be easily obtained is obtained.

[Brief description of the drawings]

FIG. 1 is a front sectional view schematically showing the entire structure of a rotary heat treatment furnace according to an embodiment.

FIG. 2 is a side sectional view taken along line XX of FIG.

FIG. 3 is a partially omitted perspective view showing a revolution driving structure of the revolution frame according to the embodiment.

FIG. 4 is an enlarged side sectional view showing a raw material container according to the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotary heat treatment furnace 2 Furnace core 3 Furnace body outer wall part 4 Partition wall 7 Raw material container 11 Revolving frame 12 Container holding part 13 Partition plate 17 1st rotation drive means 19 2nd rotation drive means A Raw material in / out zone (processing Zone) B Drying zone (processing zone) C Calcination zone (processing zone) D Slow cooling zone (processing zone)

Claims (1)

(57) [Claims] A furnace core (2) surrounded by a furnace core (2) disposed horizontally and a furnace body outer wall (3) disposed outside the furnace core (2). While providing a plurality of processing zones (A to D) which are separated from each other via partition walls (4) spaced apart along the circumferential direction of the furnace core part and have different processing conditions, the furnace core portion (2) arranged via a partition plate (13) along a vertical circumference centered on the axis (P) of (2);
A revolving frame (11) having a plurality of container holders (12) for horizontally holding a raw material container (7) containing the object to be processed, and the revolving motion with the axis (P) as a rotation center point. First rotation driving means (17) for revolving the frame (11);
Second rotation driving means (1) for rotating each of the raw material containers (7) horizontally held by the container holding portion (12).
9). A rotary heat treatment furnace comprising: