JP3960771B2 - Rotary retort furnace - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotary retort furnace in which an object to be processed is placed in a container, placed in a high temperature atmosphere, and heat-treated while rotating the container.
[0002]
[Prior art]
FIG. 5 is a sectional view showing a schematic structure of a conventional rotary retort furnace. In the figure, a furnace body 101 is constituted by a furnace shell 102 and a heater 103 provided therein. The cylindrical drum 104 is inserted through the furnace body 101 and is supported so as to be rotatable around an axis. A cylindrical capsule 105 is inserted into the drum 104 to form a double tube structure. A small object to be processed (not shown) is mainly contained in a capsule 105, and after an inert gas such as argon gas is sealed, the capsule 105 is inserted into the drum 104 together. The drum 104 is rotationally driven around an axis in an atmosphere that has become a high temperature (for example, 1000 ° C.) by energization of the heater 103 by a rotational driving device (not shown). Thereby, the capsule 105 is also rotated together, and an indirect heat treatment is performed on the object to be processed through the double tube. After the heat treatment, the capsule 105 is removed from the drum 104 and cooled.
[0003]
[Problems to be solved by the invention]
The drum 104 and the capsule 105 in the conventional rotary retort furnace as described above are required to have a certain thickness in order to ensure the mechanical strength at high temperature, and cannot be reduced excessively. Due to the double tube structure of the drum 104 and the capsule 105 having such a constant wall thickness, the heat treatment space in the capsule 105 is narrow in the conventional rotary retort furnace for the outer dimensions of the drum 104. Therefore, there is a problem that the amount of the object to be processed at one time is small.
[0004]
In view of the conventional problems as described above, an object of the present invention is to increase the processing capacity in a rotary retort furnace.
[0005]
[Means for Solving the Problems]
A rotary retort furnace according to the present invention includes a heat source, a cylindrical furnace shell is divided into an upper furnace shell and a lower furnace shell in a longitudinal direction, and the upper furnace shell is vertically divided into two to be opened and closed. A retort that is rotatable about an axis within the furnace body and is detachably attached to the furnace body in a state where the furnace shell is open, and directly accommodates an object to be processed, A rotation drive device that rotates the retort in the furnace body; and a moving device that moves the retort up and down with respect to the furnace body in a state where the upper furnace shell is divided and opened. .
In the rotary retort furnace configured as described above, a large amount of objects to be processed can be placed by directly storing the objects to be processed in the retort. Further, the retort is attached to and detached from the furnace body by the moving device.
The rotary retort furnace according to the present invention includes a heat source and a cylindrical furnace shell, and a lower part of the furnace shell is provided with a cooling port for blowing air into the furnace for forced air cooling. In the upper part, an exhaust pipe for exhausting the air blown by the cooling port is provided, the furnace shell is divided into an upper furnace shell and a lower furnace shell in the longitudinal direction, and the upper furnace shell is divided into two vertically and opened and closed. A furnace body that can be rotated around an axis in the furnace body, and can be attached to and detached from the furnace body in a state where the furnace shell is opened, and the object to be processed is directly accommodated in the furnace body. A retort that rotates the retort in the furnace body, and a moving device that moves the retort up and down with respect to the furnace body in a state in which the upper furnace shell is divided and opened. It is provided.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 are a front view (only a furnace body is shown in cross section) and a side view of a rotary retort furnace according to an embodiment of the present invention, respectively. The rotary retort furnace includes a furnace body 1, a retort 2 that directly accommodates an object to be processed (not shown), a rotary drive device 3 that rotates the retort 2, and a lift that moves the retort 2 up and down within a predetermined range. The apparatus 4 is a main component.
[0007]
The furnace body 1 includes a furnace shell 11 and a burner 12 (FIG. 2) as a heat source. In addition, a plurality of cooling ports 11 a are provided in the lower part of the furnace shell 11, and a pair of exhaust pipes 13 are provided in the upper part. By blowing air from the cooling port 11a into the furnace through a blower (not shown) and exhausting from the exhaust tube 13, the inside of the furnace after heat treatment can be forcibly air-cooled. As shown in FIG. 2, the furnace shell 11 is a thick-walled cylinder having an octagonal end surface, and includes an upper furnace shell 11 b and a lower furnace shell 11 c obtained by horizontally dividing the cylinder in the longitudinal direction. In addition, the upper furnace shell 11b is further divided into two vertically and can be opened and closed (details will be described later).
[0008]
As shown in FIG. 1, the retort 2 includes a hollow large-diameter drum portion 21 and small-diameter shaft portions 22 on both ends of the shaft, and the drum portion 21 directly accommodates an object to be processed. It is a heat treatment space. The object to be processed is, for example, opened into a drum portion 21 from the shaft end side by opening a lid (not shown), and the lid is closed after completion of the loading. The end flange 24 of each shaft portion 22 is rotatably supported by the bearing portion 41 a of the lifting device 4, so that the retort 2 can rotate around the shaft in the furnace body 1. Note that the retort 2 only rides on the bearing portion 41a with its own weight. Therefore, if the bearing portion 41a rises with the upper furnace shell 11b opened, the retort 2 can rise accordingly. Further, the right shaft portion 22 is provided with a sprocket 25 and a supporting roller 26.
[0009]
The rotational drive device 3 incorporates a motor (not shown) as a drive source, and drives the chain 31 by the rotation of the motor. The chain 31 is stretched in a substantially horizontal direction so that when the sprocket 25 is viewed from the shaft end side (the right side in FIG. 1), the sprocket 25 is pressed from below and meshes with a predetermined arc degree range centered on the outer peripheral bottom. Yes. Therefore, the retort 2 rotates around the axis by driving the chain 31. Further, the roller 32 provided in the rotation drive device 3 is in rolling contact with the support roller 26 of the retort 2 to support it.
[0010]
In the lifting device 4, the gantry 41 having the bearing portion 41 a is attached to the pair of roller chains 42 shown in FIG. 2 and is guided along the inner column 43 a of the column frame 43. The roller chain 42 is stretched between the gear 44 at the upper end serving as a pulley and the gears at the left and right ends of the four gears 45 at the lower end. The four gears 45 mesh with each other, and are driven via a chain 48 from a motor 47 attached to the lower portion of the outer column 46. The gears 45 at the left and right ends rotate in synchronization with each other in the opposite direction, thereby driving the pair of roller chains 42 in synchronization with each other in the opposite direction. Accordingly, the gantry 41 attached to the roller chain 42 moves up and down as the motor 47 rotates. Further, an opening / closing wire 49 is attached to the pair of left and right upper furnace shells 11b, and the upper furnace shell 11b can be opened and closed by winding or loosening them.
[0011]
The heat treatment using the rotary retort furnace configured as described above will be described. First, it is assumed that the retort 2 in which an object to be processed (mainly small items) to be heat-treated is in a position shown in FIG. 1 or FIG. Here, in order to put an object to be processed, a container such as a capsule is not used, and the object to be processed is directly put into the retort 2. Therefore, compared with the case where a container is used, a to-be-processed object can be put in large quantities (for example, about 500 kg). A predetermined gas (for example, argon gas) is introduced into the retort 2.
[0012]
Next, with the burner 12 (FIG. 2), the atmospheric temperature in the furnace is raised to a predetermined temperature, and the heat treatment is adjusted and maintained at the predetermined temperature, while the heat treatment for a predetermined time is performed on the workpiece in the retort 2. Do. During the heat treatment, the retort 2 is rotated at a low speed by the rotary drive device 3.
When the heat treatment is completed, the fire of the burner 12 is extinguished and the rotation of the retort 2 is stopped. Thereafter, forced air cooling is performed by ventilating the inside of the furnace from the cooling port 11a with a blower. When the temperature in the furnace drops to a predetermined temperature by forced air cooling, the open / close wire 49 is pulled to open the upper furnace shell 11b as shown in FIG. When the upper furnace shell 11b is opened, the motor 47 is driven to raise the gantry 41 and the retort 2 riding on the gantry 41 to the position indicated by the two-dot chain line in FIG. FIG. 4 is a front view showing a state in which the retort 2 is raised to the rising end. Next, using a crane or the like (not shown), the retort 2 is further lifted and transferred to a cooling device (not shown) that performs the next processing step.
[0013]
In this way, the retort 2 that directly accommodates a large amount of workpieces is heat-treated, and the whole retort 2 is passed to the next step, so that the processing capacity of the rotary retort furnace can be dramatically increased. In addition, a to-be-processed object is passed to a cooling device with the retort 2 without taking out from the retort 2, and the whole retort 2 is cooled. Therefore, various cooling patterns can be applied.
[0014]
The furnace body 1 after taking out the retort dissipates heat when the upper furnace shell 11b is opened, and the next retort can be carried in if the temperature drops to a predetermined value. Here, since the retort 2 does not exist in the furnace, the temperature of the furnace body 1 decreases rapidly, and the next heat treatment can be started quickly. In carrying-in, contrary to the above case, the retort 2 is placed at a position indicated by a solid line in FIG. 4 or a two-dot chain line in FIG. Thereafter, when the upper furnace shell 11b is closed, the heat treatment can be started.
In addition, by handling the object to be processed together with the retort 2 as described above, the operation of filling the object to be processed and the operation of taking out the object become easy to mechanize.
[0015]
In addition, in the said embodiment, it was set as the structure which takes out the retort 2 upward, However, If the opening method of the furnace shell 11 is changed as needed, it is also possible to take out in the horizontal direction. In this case, it is necessary to provide a moving device for attaching and detaching the retort 2 in the lateral direction from the furnace body 1 instead of the lifting device 4.
[0016]
【The invention's effect】
According to the rotary retort furnace of the present invention configured as described above, a large amount of object to be processed can be placed by directly storing the object to be processed in the retort, The retort can be attached to and detached from the furnace body. Accordingly, in the rotary retort furnace, the processing capacity can be dramatically increased by using the retort like a workpiece storage container. Furthermore, there is an advantage that various cooling patterns can be applied to such a retort.
[Brief description of the drawings]
FIG. 1 is a front view of a rotary retort furnace according to an embodiment of the present invention (only a furnace body is shown in cross section).
FIG. 2 is a side view of the rotary retort furnace.
FIG. 3 is a side view of the rotary retort furnace in a state where a furnace shell is opened.
FIG. 4 is a front view of the rotary retort furnace with the furnace shell open (only the furnace body is shown in cross section).
FIG. 5 is a sectional view showing a schematic structure of a conventional rotary retort furnace.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Furnace 2 Retort 3 Rotation drive device 4 Lifting device (moving device)
11 furnace shell 11b upper furnace shell 11c lower furnace shell 12 burner (heat source)

Claims (2)

A furnace body comprising a heat source, wherein a cylindrical furnace shell is divided into an upper furnace shell and a lower furnace shell in a longitudinal direction, and the upper furnace shell is vertically divided into two to be opened and closed;
A retort that is rotatable about an axis in the furnace body and is detachably attached to the furnace body in a state in which the furnace shell is open, and stores a workpiece directly inside the furnace body,
A rotation drive device for rotating the retort in the furnace;
A rotary retort furnace comprising: a moving device that moves the retort up and down with respect to the furnace body in a state where the upper furnace shell is divided and opened. A heat source and a cylindrical furnace shell are provided, and at the lower part of the furnace shell, a cooling port for blowing air into the furnace and forcing air cooling is provided, and at the upper part of the furnace shell, air is blown by the cooling port. A furnace body provided with an exhaust pipe for exhausting, wherein the furnace shell is divided into an upper furnace shell and a lower furnace shell in a longitudinal direction, and the upper furnace shell is vertically divided into two to be opened and closed;
A retort that is rotatable about an axis in the furnace body and is detachably attached to the furnace body in a state in which the furnace shell is open, and stores a workpiece directly inside the furnace body,
A rotation drive device for rotating the retort in the furnace;
A rotary retort furnace comprising: a moving device that moves the retort up and down with respect to the furnace body in a state where the upper furnace shell is divided and opened.

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