JPH0246877B2 - KAITENRETORUTORO - Google Patents

Description

Detailed Description of the Invention The present invention relates to a rotary retort furnace for heat-treating powder and granules, and when heat-treating the powder and granules in the furnace, the powder and granules are heated by a beater member in a furnace core tube. It relates to something that is loosely stirred in the furnace core tube and can be processed quickly without adhering to the inner wall of the furnace core tube.

Traditionally, rotary kiln-type rotary retort furnaces have been used for oxidation and reduction of metal powders such as iron, copper, molybdenum, or tungsten, other heat treatments, drying or roasting of food powders, and heat treatment of fine powders such as fly ash. has been done. The rotary retort furnace has a heating device inserted into the furnace, or a heating means such as blowing hot air into the furnace core tube to make various powders and granules flow through the rotating furnace core tube,
The heat treatment is performed by bringing these heating mediums into contact with the object to be treated. However, since the above-mentioned processing temperature requires a relatively high temperature, metal powder in particular softens or melts, increasing its viscosity, which not only reduces heat exchange, but also forms a sintered state that forms on the tube wall. There was a risk of adhesion and accumulation. In addition, food powders with high moisture content and high viscosity have poor fluidity, so they become triboelectrified during heat treatment, causing particles to adhere to and grow on the tube wall, and these growing particles gradually fill the tube, causing blockages in the tube. Bad phenomena also occurred. In order to prevent the heat treatment effect from being obstructed by the adhesion of the material to the tube wall as described above, it is necessary to strike the exposed parts at the front and rear of the rotary furnace each time, or from the front and rear of the tube. Measures such as peeling off with a stick were taken, but simply hitting the outer circumferential surface of the tube end does not mean that the inner surface of the tube is being directly hit, and the impact effect does not reach the center of the tube. It is not something that can be reached. Furthermore, if a striking device is installed on the exposed front and rear parts of the furnace core tube, the heating length must be shortened accordingly, and conversely, if the heating length is maintained, the device itself becomes larger. Incurs disadvantages. In addition, stripping methods using rods or the like only damage the inner wall of the furnace core tube or are unable to completely strip the center of the tube wall, making it ineffective despite the labor-intensive work. It was hot.

This invention has been made to solve the above-mentioned drawbacks, and is a rotary retort furnace that can efficiently heat-treat objects to be treated by simply providing a beater member smaller than the inner diameter of the tube inside the furnace core tube. The purpose is to provide the following.

Hereinafter, the configuration of each part will be explained in detail based on the drawings showing one embodiment of the present invention. First, in the rotary retort furnace 1 according to the present invention shown in FIGS. 1 and 2, 2 is a cylindrical furnace core tube with a smooth inner surface, and 3 is a furnace core tube 2 that is connected from the outer periphery. A heat-retaining part made of heat-resistant furnace material that covers almost the entire length,
It is placed on the underframe 4.

A heating section 5, which is an example of a heating means, is disposed between the furnace core tube 2 and the heat retaining section 3, and the main parts thereof form a rectangular parallelepiped shape as a whole. Parts of the front and rear parts of the furnace core tube 2 are exposed outside the heat retaining part 3, and flanges 6, 6' are protruded from these parts.
Buffer members 7, 7' are attached to the flanges 6, 6', and the furnace core tube 2 is supported from the left and right sides by two support members 8, 8' each provided at the front and rear of the underframe 4. are doing. This device is equipped with a tilting device (not shown) because it is necessary to tilt the rotary retort furnace 1 toward the outlet side like a general rotary kiln, so that the furnace core tube is gently tilted toward the rear with respect to the horizontal axis. It is held in a form that allows the object to be processed to flow easily. A guide vane 9 is installed on the front inlet side of the furnace core tube 2 (left side in Figure 1).
and a supply hopper 10 communicating therewith. A sprocket 11 is pivotally attached to the end of the shaft 9a of the guide vane 9, and drive is transmitted to the sprocket 13 of the motor 12 via a chain 14. A part of the tip of the guide vane 9 is inserted into the furnace core tube 2. Further, a sprocket 16 is formed on one side of the flange 6, and meshes with a sprocket 18 of a motor 17 installed below via a chain 19, whereby the furnace core tube 2 is driven at a reduced speed. On the other hand, a support member 20 provided with a ring-shaped protrusion 20a at the center of the rear end of the furnace core tube 2 is removably supported at the peripheral end of the furnace core tube 2 by an appropriate connecting member, and the outer periphery of the support member 20 is covered. Processed material outlet 2
1 is formed.

The ring-shaped protrusion 20a is adapted to insert and lock a support shaft of a beater member, which will be described below.

Now, the beater member 22 shown in FIG. 3 is inserted into the interior of the furnace core tube 2 which is rotatably supported at the front and rear portions as described above. The beater member 22 is accommodated in an internal space extending forward and backward of the furnace core tube 2, and is
Three wing pieces 24 are installed radially from 3 at equal intervals, and are divided into an appropriate number in the longitudinal direction. Each divided unit 22a of these beater members 22 has pin shafts 25, 25 arranged side by side on one end surface of the shaft tube 23, and holes 26, 26 arranged oppositely on the other end surface. By fitting and inserting the blades, each unit 22a is positioned with the wing pieces in close contact with each other and is assembled integrally. and,
A support shaft 27 is provided protruding from the rear end surface of the rearmost unit 22a, and a plurality of disc-shaped thrust members 15 are fitted to the support shaft 27, and the thrust member 15 is connected to the support member 20 and the ring. It is adapted to come into sliding contact with the shaped projection 20a. Therefore, the beater member 22 is biased toward the rear along the inclined surface of the furnace core tube 2 due to its own weight, so that even if the furnace core tube 2 rotates, it does not shift in the longitudinal direction. Note that each tip of the wing piece 24 is provided with a dorsal angle 28 (corresponding to No. 2 of the cutting tool) in the direction of rotation so as to be in line contact with the inner surface of the furnace core tube 2. In this example, the wing pieces 24 are implanted in the shaft tube 23, but there is no substantial difference even if the base ends of the wing pieces 24 are connected to each other.

In addition, 29 is a side roller to prevent the furnace core tube 2 from shifting in the horizontal direction due to thermal expansion and inclination.A frame is fixed to the outer surface of the inlet side heat retention part, and the frame is rotatable at the tip of the frame. The retort furnace supports a roller whose circumferential surface is in contact with one side of the rotating flange 6, and one to several of them are installed depending on the size of the retort furnace.

Next, the operation of the beater member 22 will be explained. When the furnace core tube 2 rotates in the direction of the arrow shown in the second figure, two of the three blades 24 of the beater member 22 come into contact with the bottom inner surface of the furnace core tube 2, and the rest One wing piece 24 is in an upright state in the inner space of the furnace core tube 2. As the furnace core tube 2 rotates, the two blades 24, 24 that are in contact with the bottom inner surface of the furnace core tube 2 also rotate, and one blade 24 stands upright in the inner space. collapses in the direction of rotation due to its own weight, and one of the other two blades 24, 24 separates from the inner surface and stands upright in the internal space. Each blade 24 of the beater member 22 rotates on the inner surface of the furnace core tube 2 by repeating the above operation. When the furnace core tube 2 falls from the upright state to the inner surface of the furnace core tube 2, a weight close to the total weight of the beater member 22 acts as gravity in the centrifugal direction, and the beater member 22 rotates to repeatedly apply a load to the tube wall.

The material to be treated is supplied from the inlet side to the beater member 22 that operates in this manner, and the powder and granules that are evenly introduced into the furnace core tube 2 by the guide vanes 9 are transferred to the blades 2.
4 falls on the tube wall, the powder and granules placed on the wing pieces 24 are released toward the tube wall, and as a result, they float and diffuse in the internal space, increasing the surface area of the powder and granules. Uniform contact with the heating medium promotes the heating effect. In particular, when the wing pieces 24 fall against the pipe wall, they hit the furnace core tube 2 hard, and the impact action causes the entire furnace core tube 2 to be hit from the inside and the blades 2
Due to the scraping action by the tip of 4, the powder particles that tend to adhere to the inner surface move along the tube wall without being deposited on the tube wall, and come into close contact with the heat medium.

In the rotary retort furnace according to the present invention, the beater member is constructed by detachably connecting a plurality of single beaters each having blades formed in a radial manner without creating an axial gap between the blades. It has the effects described in .

The internal temperature of the furnace core tube is not necessarily uniform, and certain portions are high in temperature, and the friction and impact force between the beater and the workpiece are significant at certain portions within the tube furnace. Therefore, although a predetermined portion of the beater is severely damaged, only the damaged portion of the beater alone needs to be replaced. As a result, repairs are easy, the beater member can be used for a long period of time, and costs can be reduced.

Since the large impact force that the beater member receives when it collides with the furnace core tube is absorbed as play in the connecting portion of each beater, metal fatigue of the beater member is reduced and it becomes less likely to be damaged.
Furthermore, the play in the connecting portion absorbs twisting when the beater member rotates, thereby increasing the torsional strength of the beater member.

The length of the retort furnace varies depending on the capacity of the object to be processed, but by adjusting the number of beaters to be connected, the retort furnace has versatility and can be used in furnaces of various lengths.

Even if it is a large beater component, you only need to assemble the small beater itself, so it is easy to manufacture, transport, and
Easy to assemble.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing an embodiment of a rotary retort furnace according to the present invention, FIG. 2 is a side sectional view showing a - section of FIG. 1, and FIG. 3 is a perspective view showing an embodiment of a beater member. It is a diagram. 1... Rotating retort furnace, 2... Furnace core tube, 3...
Heat retention section, 5... Heating section, 17... Motor, 22...
...beater member, 24...wing piece.

Claims (1)

[Claims] 1. A rotary retort furnace in which a core tube rotated by a drive motor is provided in a substantially horizontal direction, and a beater member is arranged in an axial direction inside the core tube, and the beater member has blades formed in a radial shape. A rotary retort furnace characterized in that a plurality of beaters are detachably connected to each other without leaving an axial gap between each blade.