JP2002277166A - Batch rotary kiln - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in the prior art that in a heat-treatment of powder and particles in a desired atmosphere a to-be-heated object is packed in a box, and heated in an electric shuttle kiln or a single kiln of a fixed hearth type, but in this process there arises temperature difference in the object between the part in contact with the box and the part in the center, and it is hard to conduct a uniform heating. SOLUTION: In the rotary kiln, an electric heater 9 is provided in the inside periphery of the furnace body 7 installed inclinably in the direction to the front and the rear. A retort 13 is rotatably installed coaxially with the heater in the furnace body. At least one end of the retort 13 is closed with a lid 23, which is freely openable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a batch type rotary kiln for heating powders and granules in a desired atmosphere.

[0002]

2. Description of the Related Art Conventionally, in order to heat a powder or granules in a desired atmosphere, an object to be processed is packed in a sagger and heated by an electric shuttle kiln or a single kiln of a fixed hearth type. .

[0003]

However, in such a method, a temperature difference is generated between a portion of the object to be processed in contact with the sagger and a central portion, and it is difficult to perform uniform heating.

[0004] It is to be noted that, if the heating time is lengthened, uniform heating can be achieved, but there is a problem that the electricity cost is increased and the work efficiency is reduced.

[0005]

Means for Solving the Problems and Effects As a means for solving such problems, a batch type rotary kiln according to the first aspect of the present invention includes an electric furnace mounted on an inner periphery of a furnace body which can be vertically inclined. A heater is disposed, and at least one end of the retort that rotates through the furnace body concentrically with the electric heater is closed by an openable lid so that the retort is substantially closed. When the retort is rotated by rotating the retort while the furnace body is tilted so that the closed side is downward and the object to be processed is loaded from the open end side and then closed with the lid, or the retort is rotated in the horizontal position. Since the object is heated while being stirred, the whole is uniformly heated. The heat-treated object is released by removing the lid and then tilting the retort so that the open end faces downward.

In the batch type rotary kiln according to the second aspect, a flow pipe for introducing or discharging an atmospheric gas into the retort is provided at both ends or one end of the retort.
The atmosphere inside the retort can be adjusted freely.

According to a third aspect of the present invention, there is provided a batch type rotary kiln wherein one end of a heating area of the retort is spaced apart from the other end by a space.
When the retort is rotated by tilting its end downwards, the object to be processed is heated not only from the outer periphery of the retort but also from the partition plate, so that it is uniformly closed, and Heat treatment is performed efficiently.

[0010] In the batch type rotary kiln according to the fourth aspect, one end of the retort is closed by the partition plate in the heating area, and the bottomed capsule is inserted from the other end with a space between the retort and the partition plate. The same effect as that of the batch type rotary kiln according to the third aspect is obtained.

In the batch type rotary kiln according to the fifth aspect, the diameter of the heating area of the retort is smaller than both end sides, and the lids are fitted into the both ends, so that the lid comes into contact with the step of the retort. The airtightness is improved.

In the batch type rotary kiln according to the sixth aspect, since the cross section of the heating area of the retort is polygonal, the object to be processed can be well stirred without providing a lifting piece on the inner peripheral surface of the retort. In addition, the inside can be easily cleaned as compared with the case where a lifting piece is provided.

In the batch type rotary kiln according to the present invention, since the protective cover is provided between the retort and the electric heater, even if the retort is damaged, the workpiece may be damaged by the electric heater. There is no.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the present invention will be described below with reference to the accompanying drawings. In the first embodiment shown in FIGS. 1, 2, and 3, a support plate 5 is supported on the upper surface of a base 1 by a shaft 3 and a hydraulic cylinder 6 so as to be freely tiltable in the vertical direction. Is fixedly provided.

An electric heater 9 is disposed on the inner periphery of the furnace body 7, and insertion holes 11 concentric with the electric heater 9 are formed at both ends of the electric heater 9.
Are inserted with a slight gap.

The retort 13 is mounted on a pair of two flat rollers 17 and flanged rollers 19 provided on both ends of the support plate 5 with a ring 15 fixed to the outer periphery near both ends, and is rotatably supported. And one of the rollers 17 and 19 is driven to rotate in one direction, and the retort 13 protrudes from both ends of the furnace body 7 by the same size and corresponds to both ends of the electric heater 9. The ring 21 is fixed to the inner circumference of the position, and the retort 1
Both ends of 3 are openably closed by a lid 23.

The lid 23 has the same length as the ring 21 from the end of the retort 13 to the end thereof, has a bottomed cylindrical shape that fits almost tightly into the retort 13, and has an inner end filled with a heat insulating material 25. At the same time, a seal 27 is provided on the inner end face of the retort 13 so as to contact the ring 21, and a cover plate 29 over the outer end face is provided with a seal 31 on the end of the retort 13. 33 penetrates.

The operation of the present embodiment will be described. As shown in FIG. 3, the retort 13 is inclined by the extension or contraction of the hydraulic cylinder 6 so that the lid 23 is fitted into the lower opening and the seal 27 is attached. After pressing against the ring 21 and pressing the seal 31 against the end of the retort 13, the cover 23 is fixed to the retort 13 with a fastener (not shown) such as a bolt.
It is fixed and closed at the lower end.

Then, a powdery or granular object is charged from the upper end of the retort 13, and the upper end of the retort 13 is closed with the lid 23 in the same manner as described above, and the hydraulic cylinder 6 is contracted. Alternatively, the retort 13 is brought into a horizontal posture by extension, and the electric heater 9 is energized to generate heat, and the retort 13 is rotated to heat the object a while stirring.

At this time, the gas in the retort 13 is adjusted by appropriately introducing or discharging gas from the atmosphere gas flow pipes 33 of the lids 23 on both sides. In addition, retort 13
May be rotated in an inclined position.

The object to be heat-treated is a retort 13
To remove the upper lid 23, and then tilt it up and down to rotate the retort 13 to discharge.

In the second embodiment shown in FIG. 4, a portion of the retort 13 corresponding to one end of the electric heater 9 has the first
First partition plate 35 replacing ring 21 of the embodiment
Is formed, a second partition plate 36 is stretched inside the first partition plate 35 to form a sealed space 37, and a heat insulating material 39 is packed behind the first partition plate 35. Without the lid 23, the lid 23 through which the atmospheric gas flow pipe consisting of the double pipe 41 penetrates the other side of the retort 13
The structure is the same as that of the first embodiment except that the is inserted.

The charging and discharging of the workpiece a in this embodiment is performed in the same manner as in the first embodiment, except that the retort 13 is inclined during heating, and the workpiece a is rotated around the retort 13. The heating is performed not only from the surface but also from the second partition plate 36, and further, the stirring is well performed and the heating is performed uniformly.
The introduction and discharge of the atmosphere gas are performed only on one side by the atmosphere gas flow pipe composed of the double pipe 41.

In the third embodiment shown in FIG. 5, there is no ring around the inner peripheral surface of the retort 13 and a partition plate 45 is stretched at a position corresponding to one end of the electric heater 9. A heat insulating material 39 is packed on the rear side, and several columns 43 of a fixed length are erected on the front surface of the partition plate 45, and a capsule 47 whose front surface is opened from the front end of the retort 13 is formed. The column 43 is fitted almost tightly so that the strut 43 comes into contact with the bottom surface thereof. The front end of the retort 13 is fitted with the lid 23 similar to that of the second embodiment, and its operation is the same as that of the second embodiment. This is the same as the embodiment.

In the fourth embodiment shown in FIGS. 6 and 7, the end portions 14 of the retort 13 are circular and the central portion 16 is hexagonal. When inserted from both sides, the end face of the lid 23 hits the step 19 of the retort 13 and is sealed, and the central part 16 which is the accommodation part of the object to be processed is hexagonal, so that stirring is performed well.

[Brief description of the drawings]

FIG. 1 is an exploded cross-sectional view of a first embodiment.

FIG. 2 is a sectional view of the assembled state.

FIG. 3 is a cross-sectional view showing a state where a lid on one side is removed.

FIG. 4 is a cross-sectional view of the second embodiment.

FIG. 5 is a cross-sectional view of a third embodiment.

FIG. 6 is a cross-sectional view of a fourth embodiment.

FIG. 7 is a partially cutaway perspective view of the retort.

[Explanation of symbols]

 1: Base 5: Support base 7: Furnace 9: Electric heater 11: Insertion hole 13: Retort 15: Ring 23: Lid 33: Flow pipe

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) F27D 7/06 F27D 7/06 B F term (reference) 4K061 AA08 BA00 CA02 CA05 CA12 CA23 CA27 DA05 4K063 AA05 AA12 BA15 CA06 DA11 DA22 DA28

Claims (7)

[Claims] An electric heater is disposed on an inner periphery of a furnace body which is installed so as to be tiltable in a vertical direction, and at least one end of a retort which rotates concentrically with the electric heater and penetrates the furnace body is freely openable. A batch type rotary kiln which is closed by the body so that the retort is almost closed. 2. The batch type rotary kiln according to claim 1, wherein a flow pipe for introducing or discharging gas into or from the retort is provided at both ends or one end of the retort. 3. The batch type rotary kiln according to claim 1, wherein one end of a heating area of the retort is closed by two spaced-apart partition plates. 4. The retort according to claim 1, wherein one end of the retort is closed by a partition plate in a heating area, and a capsule with a bottom is inserted from the other end with a space between the capsule and the partition plate. Or the batch type rotary kiln according to 2. 5. The batch type rotary kiln according to claim 1, wherein a diameter of a heating zone of the retort is smaller than both ends, and a lid is fitted in the both ends. 6. The batch type rotary kiln according to claim 5, wherein a sectional shape of a heating area of the retort is polygonal. 7. The batch type rotary kiln according to claim 1, wherein a protective cover is provided between the retort and the electric heater.