JPH0434396Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a rotary kiln that performs heat treatment such as baking or drying of objects to be processed, such as granular materials of beans and grains.

(Prior art) Conventional rotary kilns include, for example,
There is a heating rotary furnace described in Publication No. 44317.

In this heating rotary furnace, a cylindrical rotary body is rotatably fitted in the combustion furnace with its axis slanting forward and downward, and the inlet end of the cylindrical rotary body has a A supply tube is provided in a protruding state within the rotary body, and a mixing tube in the shape of a flared flap is provided at an outlet end of the reverse feed tube of the internal reverse feed device in the rotary body to surround the feed tube. ing. As the rotating body rotates, the material to be processed moves backward on the inner surface of the mixing cylinder, falls onto the inner surface of the rotating body, moves forward on the same inner surface, and is then fed into the reverse feed cylinder. The screw conveyor of the reversing device causes the screws to be sent back to the mixing tube, and the above-mentioned actions are repeated continuously.

(Problems to be solved by the invention) In the above-mentioned conventional heating rotary furnace, the material to be treated is transferred on the inner surface of the rotating body by natural flow using the inclination of the rotating body. Therefore, the object to be processed tends to stagnate on the inner surface of the rotating body, and the object to be processed cannot be heated uniformly in some cases.

In addition, since the material to be processed is discharged by overflowing without being fed into the reverse feed tube, the material to be processed may be discharged in a short period of time after being input, or may take longer than the specified time. It was predicted that uneven tanning would occur on the treated object due to heat treatment. Furthermore, it was inconvenient to discharge all the objects to be processed inside the rotating body.

Therefore, an object of the present invention is to provide a rotary kiln that can solve the problems of the conventional techniques described above.

(Means for Solving the Problems) The rotary kiln of the present invention to solve the problems in the conventional technology described above has a rotating kiln installed in the furnace so as to be able to rotate in forward and reverse directions about an approximately horizontal axis. An outer cylinder having a bottomed cylindrical shape and whose opening serves as an outlet, and an inner cylinder having a bottomed cylindrical shape and having a smaller diameter and shorter length than the outer cylinder and whose opening serves as an input port. The outer cylinder is formed into a double cylindrical shape, with the opening end of the outer cylinder protruding beyond the opening end of the inner cylinder, and the inner periphery of the outer cylinder has a spiral direction in the forward rotation direction and the opposite direction of the rotating body. a first spiral blade having a spiral direction opposite to that of the first spiral blade is provided on the inner circumference of the inner cylinder, and a second spiral blade having a spiral direction opposite to that of the first spiral blade is provided on the inner periphery of the inner cylinder, is an opening in the inner cylinder, and an opening extending from the rear edge of the opening in an inclined manner toward the front in the normal rotation direction when viewed from the normal rotation direction of the rotating body, and installed on the outer cylinder. and a guide plate, forming a communication path through which the object to be processed in the outer cylinder is scraped up by the guide plate and introduced into the inner cylinder through the opening by normal rotation of the rotating body. This is the gist of the report.

(Function) According to the above-mentioned means, as the rotating body is rotated in the forward direction, the object to be processed inside the rotating body is moved inside the outer cylinder by the first spiral blade. After being transferred to the bottom end of the cylinder along the inner circumferential surface, it is sent into the inner cylinder through the opening while being scraped up by the guide plate of the communication path, and inside the inner cylinder, the second After being transferred along the inner circumferential surface of the inner cylinder to the opening side end by the spiral blade, it is dropped onto the inner surface of the opening side end of the outer cylinder, and thereafter, this circulation is repeated to undergo heat treatment. be done.

Furthermore, by reversing the rotating body, the heat-treated workpiece is transferred in a direction opposite to the transfer direction of the heat treatment, and is promptly discharged to the outside from the open end of the outer cylinder. .

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

In FIG. 2, which shows a schematic cross-sectional view of a rotary kiln, and FIG. 3, which shows a cross-sectional view taken along the - line in FIG. A body 3 is arranged rotatably about a horizontal axis.

Although the furnace 2 will be described in detail later, the rotating body 3 will be described in detail first based on the cross-sectional view of FIG. In addition, in the explanation, the front refers to the right side in Figures 1 and 2, and the rear refers to the right side in Figures 1 and 2.
In the figure, it points to the left side.

The rotating body 3 has a double cylindrical shape, consisting of a bottomed cylindrical outer tube 4 and a cylindrical inner tube 5 that is continuous with the bottom 6 of the outer tube 4 and has a smaller diameter and shorter length than the outer tube 4. is formed. The inner cylinder 5 and the outer cylinder 4 are arranged on the same axis. A cylinder bottom 6 of the outer cylinder 4 is disposed on the rear side, and a rotating shaft 7 that is coaxial with the outer cylinder 4 projects from the rear side surface of the cylinder bottom 6. Further, the open end (front end) of the outer cylinder 4 protrudes beyond the open end of the inner cylinder 5, and the end thereof is widened in a widening shape. Note that the outer cylinder 4 and the inner cylinder 5 are each formed from a suitable material, for example, stainless steel mesh material.

The rotating shaft 7 is connected to a drive motor 8,
By driving the motor 8, it is selectively rotated in forward and reverse directions. Note that the normal rotation of the rotating body 3 in this example refers to rotation in the counterclockwise direction when viewed from the front of the rotating body 3 (the right side in FIG. 1), and the term reverse rotation similarly refers to rotation in the clockwise direction. shall be.

Further, the open end of the rotating body 3 is supported by two freely rotatable receiving rollers 9 arranged below the open end. Note that each receiving roller 9 is rotatably supported via a support member (not shown).

A first spiral blade 10 is integrally formed on the inner periphery of the outer cylinder 4 over almost the entire length. Note that the helical direction of the first spiral blade 10 is a right-handed screw direction.

A second spiral blade 11 is integrally formed on the inner periphery of the inner cylinder 5 over almost the entire length. The helical direction of the second helical blade 11 is a left-handed screw direction that is opposite to the helical direction of the first helical blade 10.

Therefore, at the end of the inner cylinder 5 on the cylinder bottom 6 side,
An opening 12 that opens approximately half of the opening 12 is opened, and further, in the opening 12, a guide plate 13 is directed forward in the normal rotation direction from the rear edge of the rotating body 3, which is the rear side when viewed from the normal rotation direction. It used to extend in an inclined shape, and its tip was installed inside the outer cylinder 4 (see Fig. 4). Note that the opening 12 and the guide plate 13 form a communication path that communicates the inside of the inner periphery 5 with the inner periphery of the outer cylinder 4 .

In addition, when charging the workpiece A into the rotary body 3, a charging chute 14 tilting downward toward the open end of the inner cylinder 5 is appropriately connected (see the two-dot chain line in FIG. 1). .

Next, the furnace 2 will be described. As shown in FIGS. 2 and 3, the furnace 2 is mainly formed of a reflective wall 15 formed in the shape of a cylinder with a bottom and surrounding the rotating body 3. A rotating shaft 7 of the rotating body 3 is rotatably supported on the bottom of the reflecting wall 15 . reflective wall 15
is made of a suitable reflective material such as aluminum or stainless steel (SUS304) to ensure heat reflection and heat retention effects.

The heating device 1 provided within the reflective wall 15 is a gas burner 1 equipped with a large number of loop-shaped combustion tubes 16.
7 will be the main body. That is, a gas burner 17 consisting of a line burner having a large number of gas ejection ports 18 arranged in series is arranged below the reflecting wall 15 . The combustion pipe 16 provided continuously with the gas outlet 18 surrounds the rotating body 3 about one and a half times, and is communicated with the exhaust side header 19 on the upper part of the reflecting wall 15. The combustion tube 16 is a gas burner 17
Far-infrared rays are radiated by passing the combustion gas. An exhaust fan 20 is connected to the exhaust header 19, and when the fan 20 is operated, the exhaust gas in the combustion pipe 16 is transferred to the exhaust header 19.
is forcibly exhausted to the outside through the

In the rotary kiln described above, the workpiece A
An example of heat treatment will be described below. First, the rotating body 3 is heated by the heating device 1 of the furnace 2, and the rotating body 3 is heated by the drive motor 8.
While rotating normally (see the arrow in FIG. 4), the workpiece A is charged into the inner cylinder 5 via the charging chute 14.

The workpiece A put into the inner cylinder 5 is transferred forward along the inner circumferential surface of the inner cylinder 5 by the second spiral blade 11, and falls onto the inner circumferential surface of the outer cylinder 4 from its front open end. and is transferred rearward along the inner peripheral surface of the outer cylinder 4 by the first spiral blade 10 of the outer cylinder 4, and is further transferred to the inner cylinder 5 through the guide plate 13 and the opening 12.
After being sent to the inner peripheral surface of the inner cylinder 5, the second spiral blade 11 of the inner cylinder 5 transports it forward along the inner peripheral surface of the inner cylinder 5, thereby circulating within the rotating body 3. Note that the charging of the object to be processed A is finished as appropriate.

Thereafter, the object A is heat-treated by continuing the above-described circulation.

When the heat treatment of the object A is completed, the drive motor 8 is switched to rotate the rotating body 3 in the reverse direction. Then, the object to be processed A is transferred in a direction opposite to the transfer direction during the heat treatment. The workpiece A transferred to the open end of the outer cylinder 4
is quickly dropped and discharged from the same end to the outside, and is housed in a suitable container (not shown).

Further, as the heating device 1 of the furnace 2, a gas burner 17 equipped with a large number of combustion tubes 16 surrounding the rotating body 3 is used.
By employing this, it is possible to obtain a uniform temperature distribution over the length direction of the rotating body 3, which is effective in uniformly heating the object A to be processed.

Note that during the heat treatment of the object A, it is desirable to close the open end surface of the outer cylinder 4 with a cap or the like.

Moreover, the rotating body 3 can be tilted by tilting its axis at a predetermined angle of inclination as necessary.
It may also be arranged in an inclined position.

Further, the number of spirals of each spiral blade 10, 11, the number of blade threads, the protrusion width of the blade, etc. are appropriately selected and are not limited.

Further, as the heating device 1, in addition to the above, a heating device 21 shown in FIGS. 5 to 7 is also employed. Regarding this heating device 21, a gas burner 23 consisting of a line burner having a large number of gas jet ports 22 arranged in an arc shape is arranged at the lower rear surface of the cylindrical bottom of the reflecting wall 15 in the furnace 2.

A plurality of linear combustion pipes 24 are provided in series with the gas outlet 22 of the gas burner 23 and are installed parallel to the front, and communicate with an annular hot air header 25 provided at the front edge of the reflecting wall 15. has been done. The combustion tube 24 radiates far-infrared rays by passing combustion gas from the gas burner 23 .

Furthermore, a plurality of exhaust pipes 26 are connected in an arc shape together with the combustion pipe 24 in the upper part of the hot air header 25, and the exhaust pipes 26
The tip of the reflective wall 15 is installed parallel to the rear.
It communicates with an arc-shaped exhaust header 27 provided at the bottom of the cylinder. Combustion gas sent from the combustion pipe 24 to the hot air header 25 flows through the exhaust pipe 26 to the exhaust header 27, and then the exhaust fan 2 of the exhaust header 27
8, the air is forcibly exhausted to the outside.
The exhaust pipe 26 radiates heat by passing exhaust gas.

(Effect of the invention) That is, according to the invention, by rotating the rotating body in the normal direction, the object to be processed inside the rotating body is moved by the first spiral blade inside the outer cylinder. After being transferred along the inner peripheral surface of the outer cylinder to the bottom end of the cylinder,
It is scraped up by the guide plate of the communication path and fed into the inner circumference through the opening, and inside the inner cylinder, the opening side end is swept along the inner circumferential surface of the inner cylinder by the second spiral blade. After being transferred to the outer cylinder, it is dropped onto the inner surface of the open end of the outer cylinder, and then heat-treated by repeating this circulation. The workpiece is forcibly transferred by the spiral blades of the outer cylinder and the inner cylinder, which allows the workpiece to be transferred smoothly without stagnation, and the workpiece is heated uniformly. can do.

Furthermore, according to the present invention, by normal rotation of the rotating body,
Since the material to be processed is forcibly circulated within the rotating body, it is possible to transfer the material to be processed at the optimum time and temperature for each batch, compared to conventional equipment that transfers the material using the tilt of the rotating body. It can also be heated and treated.

Further, by reversing the rotary body, the object to be treated is forcibly transferred in the opposite direction to the transfer direction during the heat treatment, so that the object is quickly discharged to the outside from the open end of the outer cylinder. Also, it is possible to easily discharge the materials to be treated in each batch.

In addition, since the material to be processed can be loaded and discharged from the opening side of the rotating body, it requires less work space compared to conventional equipment in which the material to be treated is loaded and discharged from different positions. There is no need to provide a special inlet or outlet in the cylinder or inner cylinder, and the device can have a simple structure.

[Brief explanation of the drawing]

Figures 1 to 4 show one embodiment of the present invention, in which Figure 1 is a side sectional view of the rotating body of a rotary kiln, Figure 2 is a left side view of the rotary kiln, and Figure 3 is a left side view of the rotary kiln.
The figure is a cross-sectional view taken along the - line in Figure 2, Figure 4 is a cross-sectional view taken along the - line in Figure 1, Figures 5 to 7 show other examples of the heating device, and Figure 5 is a side view of the rotary kiln. 6 is a sectional view taken along the line -- in FIG. 5, and FIG. 7 is a rear view of the rotary kiln. 2...Furnace, 3...Rotating body, 4...Outer cylinder, 5...
Inner cylinder, 10...first spiral blade, 11...second spiral blade.

Claims (1)

[Scope of Claim for Utility Model Registration] A rotating body is provided in a furnace so as to be able to rotate in forward and reverse directions around a substantially horizontal axis, and an outer cylinder having a bottomed cylinder shape and whose opening serves as an outlet; The outer cylinder has a bottomed cylinder shape having a smaller diameter and a shorter length, and is formed into a double cylinder shape with an inner cylinder whose opening serves as an input port, and the open end of the outer cylinder is connected to the open end of the inner cylinder. A first spiral blade is provided on the inner periphery of the outer cylinder and has a spiral direction in a direction opposite to the forward rotation direction of the rotating body, and a first spiral blade is provided on the inner periphery of the inner cylinder. A second helical blade having a helical direction opposite to that of the helical blade is provided, and at the end of the cylinder bottom side of the inner cylinder, an opening of the inner cylinder and a direction from the normal rotation direction of the rotating body at the opening are provided. and a guide plate extending obliquely from the rear edge toward the front in the normal rotation direction and installed on the outer cylinder, so that the object to be processed in the outer cylinder is moved by the normal rotation of the rotating body. A rotary kiln, characterized in that a communication path is formed through which the guide plate scrapes up the liquid and introduces the scraped material into the inner cylinder through the opening.