JP2601465Y2 - 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 useful for heating various kinds of powders in a desired gas atmosphere.

[0002]

2. Description of the Related Art As an industrial rotary furnace for heat-treating powders and granules, there has been known an industrial rotary furnace having a mechanism for heating a side surface while rotating a heating drum serving as a furnace container horizontally and rotating the drum. I have. In this type of rotary heating furnace, a screw feeder using swirling blades is used as one of effective means for continuously supplying and discharging raw material particles.

[0003] However, the conventional screw feeder is designed in such a manner that a transfer pipe having a built-in swirl vane is loosely fitted at the entrance and exit of the rotating heating drum. A gap is formed between the furnaces, and the inside of the furnace cannot be made airtight.
For this reason, it is difficult to maintain the gas atmosphere in a predetermined state, and furthermore, a driving problem that requires a different driving force from the rotation of the heating drum to rotate the rotating blades, and often causes a failure in the rotating mechanism. There is a point.

[0004]

SUMMARY OF THE INVENTION The present invention has been developed to solve the above-mentioned problems caused by the rotary heat treatment furnace having the conventional structure. It is an object of the present invention to provide a rotary heat treatment furnace having a hermetic structure, which is provided with a continuous transfer mechanism and can maintain the inside of the furnace at a desired gas atmosphere.

[0005]

In order to achieve the above object, a rotary heat treatment furnace according to the present invention has a cylindrical shape in which a heating drum portion is housed inside an insulated muffle provided with a heating means at a lower portion. A container body-shaped heating drum and a furnace body part integrally formed with an introduction cylinder part and a discharge cylinder part internally provided with screw blades fixed at both ends of a central axis thereof are rotatably installed, and the introduction cylinder part and the discharge cylinder are provided. The configuration is characterized in that the ends of the sections are connected to a raw material supply section and a processed product discharge section by a hermetically sliding sliding seal mechanism.

In this configuration, a gas introduction pipe extending from the end of the raw material supply section to the heating drum through the introduction cylinder is provided, and further, a gas introduction pipe is provided at the center of the rake blade attached to the front portion of the discharge cylinder of the heating drum. In addition, a gas discharge pipe that passes through the discharge cylinder section and reaches the treated product discharge section is installed.

[0007]

In the rotary heat treatment furnace according to the present invention, a heating drum portion of a furnace body portion is accommodated in an insulated muffle having a heat generating means at a lower portion, and the furnace body portion has a cylindrical container-shaped heating drum. In addition, as a structure in which an introduction cylinder portion and a discharge cylinder portion in which screw blades are internally fixed at both ends of the center shaft are integrally formed, the introduction cylinder portion and the discharge cylinder portion are rotatably installed by driving means outside the furnace. Therefore, since the screw blades are fixed inside the introduction cylinder and the discharge cylinder, they are not individually driven to rotate.However, when the furnace body rotates about the introduction cylinder and the discharge cylinder at both ends as rotation axes, In response to this, the screw blades in the introduction cylinder and the discharge cylinder also rotate. The continuous supply and discharge of the raw material particles progress by the transport action by this rotation.

[0008] The ends of the introduction cylinder and the discharge cylinder of the furnace body are connected to a fixedly installed raw material supply section and a processed product discharge section by a hermetically sealed sliding seal mechanism to achieve airtightness. . For this reason, sufficient airtightness is maintained for the entire furnace structure, and the atmosphere in the furnace can be controlled to a desired gas system. At this time, a gas introduction pipe is installed from the end of the raw material supply unit to the heating drum through the introduction cylinder, and the processing product is passed through the discharge cylinder at the center of the rake blade mounted inside the heating drum. By installing a gas discharge pipe to the discharge section, the control of the atmosphere gas in the furnace can be performed smoothly.

Through such an action, various kinds of powders can be efficiently heat-treated while rolling in a desired gas atmosphere system. In addition, since the supply and discharge of the raw material particles are smoothly performed by the screw blades in the introduction cylinder portion and the discharge cylinder portion that respond to the rotation of the heating drum,
The driving energy is small, and the driving system does not break down. Therefore, excellent practicality is exhibited particularly as a large-scale industrial furnace used in a temperature range of 500 to 700 ° C.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. FIG. 1 is a side sectional view showing a rotary heat treatment furnace according to the present invention, wherein 1 is an adiabatic muffle equipped with a heating means 2 at a lower portion, and 3 is a furnace body. The heat insulating muffle 1 is formed of a cylindrical frame filled with a suitable heat insulating material, and an electric heater, a propane gas burner, or the like is installed as the heat generating means 2.

The furnace body 3 includes a heating drum 4 having a cylindrical container shape.
And the introduction cylinder part 5 and the discharge cylinder part 6 located at both ends of the central axis are integrally formed. Among them, the introduction cylinder 5 has a supply screw blade 7 therein as shown in the partially enlarged explanatory views of FIGS. 1 and 2, and the discharge cylinder 6 has the partially enlarged explanatory views of FIGS. 1 and 3. As shown, a discharge screw blade 8 is provided inside.
The supply screw blade 7 and the discharge screw blade 8 have their tips fixed to the inner wall surfaces of the introduction tube portion 5 and the discharge tube portion 6 by welding or the like, and do not rotate themselves. At the time of fixing, the direction of the supply screw blade 7 and the direction of the discharge screw blade 8 are opposed to each other. For example, when the furnace body 3 is rotated clockwise, the conveying direction of the supply screw blade 7 is directed to the heating drum 4 and vice versa. It is preferable that the discharge screw vanes 8 are designed so that the conveying direction of the discharge screw blades 8 is directed toward the processed product discharge section 18 when the counterclockwise rotation is performed.

The inside of the heating drum 4 may have a structure in which, for example, a plurality of spiral blades are provided on the inner surface or a stirring pin is planted on the inner wall depending on the purpose of use.
At the front position of the discharge cylinder 6, there is provided a rake blade 9 for continuously scooping up the heat-treated granular material while rotating and introducing the same into the discharge cylinder. The rake blade 9 can guide the granular material to the discharge screw blade 8 only when the heating drum 4 is rotated counterclockwise. The rake blade 9 is a normal rake having a plurality of rake pieces attached to each other, and the shape is not limited.

The furnace body 3 holds the outer periphery of the introduction cylinder 5 and the discharge cylinder 6 with a bearing 10 outside the furnace so that the heating drum 4 is housed inside the heat insulating muffle 1.
A rotation mechanism 11 is provided in the discharge cylinder 6 and connected to the drive device 12. The rotating mechanism 11 may be a combination of a chain and a sprocket in addition to the gear device as shown. The position where the rotating mechanism 11 is installed is not limited to the discharge cylinder 6 but may be the introduction cylinder 5 or may be provided on both of these cylinders.

The end portions of the introduction tube portion 5 and the discharge tube portion 6 are provided with a raw material supply portion 15 provided with a material introduction tube 14 via a hermetic sliding seal mechanism 13 and a processing provided with a processed product discharge tube 16 and an exhaust tube 17. It is connected to the product discharge section 18. A gland seal is applied to the hermetically sliding sliding seal mechanism 13 to maintain sufficient airtightness, and 23 is a mechanical seal.

The raw material supply section 15 has an introduction cylindrical section 5 from the end.
A gas introduction pipe 19 penetrating through to the heating drum 4 is provided. The gas introduction pipe 19 is loosely inserted into the axial center of the supply screw blade 7 fixed and installed inside the introduction cylinder 5, and when the furnace body 3 rotates, its peripheral surface is used for supply. The inner surface of the screw blade 7 slides. In addition, a gas discharge pipe 20 that penetrates through the discharge cylinder portion 6 and reaches the treated product discharge portion 18 is provided at the center of the rake blade 9 on the discharge cylinder portion side.
The gas discharge pipe 20 is attached so as to insert the axial center of the discharge screw blade 8, and in this portion, both members are integrated by welding or the like.

In addition, an adjustment valve 21 is installed outside the gas introduction pipe 19, and the raw material introduction pipe 14, the processed product discharge pipe 1
A damper 22 is provided inside each of the exhaust pipe 6 and the exhaust pipe 17, and all connecting portions of the members are formed in an airtight structure.

In operating the rotary heat treatment furnace of the present invention, a raw material hopper (not shown) is connected to the raw material introduction tube 14 and the gas introduction tube 1 is closed with the treated product discharge tube 16 closed.
A predetermined atmospheric gas flows into 9. Then, heating means 2
Then, the lower part of the heating drum 4 is heated while the furnace body part 3 is rotated by operating the driving device 12 so that the supply screw blades 7 are in the supply direction, and the granular material to be treated is heated from the introduction cylinder part 5. It is introduced into the drum 4. When the heating drum 4 is filled with a certain amount of powder, the supply of the raw material is interrupted, and a heating process is performed at a predetermined temperature and time. When the heating process is completed, the furnace body 3 is rotated in the reverse direction to operate the rake blades 9,
The treated powder and granules are dropped from the treated product discharge pipe 16 through the conveying action of the discharge screw blades 8 of the discharge cylinder portion 6 and collected.

[0018]

As described above, according to the rotary heat treatment furnace according to the present invention, the screw blades for supplying / discharging the granular material are fixedly installed in the introduction cylinder and the discharge cylinder which are the rotating shafts of the heating drum. With the mechanism described above, it is possible to smoothly carry the powder and granules by utilizing the rotation of the furnace body itself, and furthermore, it is possible to configure an airtight furnace structure.

Further, in the case of processing in which the residence time of the granular material in the heating drum may be short, all of the supply screw blade, the rake blade discharge mechanism, and the discharge screw blade are adjusted in the same rotation direction. The powder can be continuously moved in the same rotation direction without reversing from supply to discharge. Therefore, it is ultimately useful as an industrial furnace for stirring and heating various kinds of powders in a predetermined gas atmosphere.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an embodiment of a rotary heat treatment furnace according to the present invention.

FIG. 2 is a partially enlarged explanatory view showing an introduction cylinder of FIG. 1;

FIG. 3 is a partially enlarged explanatory view showing a discharge cylinder part of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulated muffle 2 Heating means 3 Furnace body 4 Heating drum 5 Introductory cylinder part 6 Discharge cylinder part 7 Supply screw blade 8 Discharge screw blade 9 Rake blade 10 Bearing 11 Rotary mechanism 12 Drive device 13 Hermetic sliding seal mechanism 14 Raw material introduction pipe 15 Raw material supply section 16 Treated product discharge pipe 17 Exhaust pipe 18 Treated product discharge section 19 Gas introduction pipe 20 Gas discharge pipe 21 Adjustment valve 22 Damper 23 Mechanical seal

──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. ⁶ identification code FI F27B 7/36 F27B 7/36 (58) Field surveyed (Int.Cl. ⁶ , DB name) F27B 7/06 F27B 7/08 F27B 7/24 F27B 7/32 F27B 7/33 F27B 7/36

Claims (1)

(57) [Scope of request for utility model registration] 1. An introduction cylinder having a cylindrical container-shaped heating drum and screw blades fixedly mounted at both ends of a central axis of the heating drum so that the heating drum portion is accommodated in an insulating muffle having a heating means at a lower portion. A rotatable furnace body part integrally formed with a discharge part and a discharge cylinder part is connected to the raw material supply part and the processed product discharge part by a hermetically sliding sliding seal mechanism. in a rotary heat-treating furnace and formed by the original
From the end of the feed section to the heating drum
A gas inlet pipe is installed, and the heating drum's discharge tube front part
Through the discharge cylinder at the center of the rake blade mounted on the
It is characterized by installing a gas exhaust pipe to the treated product exhaust section.
Rotary heat treatment furnace.