JPH0419471B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a beater member used in a rotary retort furnace or the like for heat-treating powder and granules. It relates to something that is loosely fitted and stirred in the furnace core tube by a beater member in the core tube, and can be processed quickly without adhering to the inner wall of the furnace core tube.

Conventionally, 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. ing. The rotary retort furnace uses heating means such as inserting a heating device into the furnace or blowing hot air into the furnace core tube.
Various powders and granules are made to flow through a rotating furnace core tube, and these heating mediums are brought into contact with the workpiece to perform heat treatment. However, since the above treatment temperature requires a relatively high temperature, metal powder in particular softens or melts, increasing its viscosity, which not only reduces heat exchange, but also causes it to become sintered, causing the tube wall to become sintered. There was a risk that it would adhere to and accumulate on the surface. In addition, food powders with high moisture content and high viscosity have poor fluidity, so they are triboelectrified during heat treatment, causing particles to adhere to and grow on the tube wall, and these growing particles sequentially 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 was made in order to solve the above-mentioned drawbacks, and three radial lines are formed at every 120° around the shaft.
It is an object of the present invention to provide a beater member for a rotary retort furnace that can efficiently promote heat treatment of a workpiece with a configuration in which only two blades are provided.

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 shown in FIGS. 1 and 2, 2 is a furnace core tube formed in a cylindrical shape and having a smooth inner surface;
Reference numeral 3 denotes a heat insulating part made of a heat-resistant furnace material that covers almost the entire length of the furnace core tube 2 from the outer periphery, and 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 as in a general rotary kiln, so that the furnace core tube is gently tilted toward the rear with respect to the horizontal axis. The material to be processed is held in a form that allows it 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
From 3, three wing pieces 24 are arranged radially at equal intervals.
They are planted every 120 degrees and are divided into appropriate numbers according to the length of the fragrance. These beater members 22
Each divided unit 22a has pin shafts 25, 25 arranged in parallel on one end surface of the shaft tube 23, and holes 26, 25 on the other end surface.
26 are provided facing each other, and the adjacent pin shafts 25, 25 are fitted into each other, so that each unit 22a is positioned and assembled integrally. 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.
It is adapted to come into sliding contact with the ring-shaped protrusion 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 has a dorsal angle 28 (corresponding to No. 2 of the cutting tool) in the direction of rotation.
It is arranged in such a way that it is 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 way, and the powder particles introduced evenly into the furnace core tube 2 by the guide vanes 9 are distributed as the blades 24 fall against the tube wall. As a result, the powder placed on the wing pieces 24 is ejected toward the tube wall, floating and diffusing in the internal space, increasing the surface area of the powder. Uniform contact with the heating medium promotes the heating effect. In particular, when the wing pieces 24 fall against the tube wall, they hit the furnace core tube 2 hard, so the impact action causes the entire furnace core tube 2 to be hit from the inner surface and scraped by the tips of the blades 24. Therefore, the particulate matter that tends to adhere to the inner surface moves along the tube wall without being deposited on the tube wall, and comes into close contact with the heat medium.

As explained above, since the beater member of the rotary retort furnace according to the present invention has the above structure, it has the following effects.

(1) A combination of connected beaters with radial blades smaller than the tube diameter inside the furnace core tube is freely stored, and as the furnace core tube rotates, the blades rotate and strike the tube wall. Therefore, due to the rotation of the blades, the powder and granular material to be treated is dispersed and agitated, improving the heat treatment effect and making it possible to uniformly impact the pipe wall from the inside, which is different from the conventional method of impacting the outer circumferential surface of the pipe. In comparison, by being able to more reliably prevent adhesion to the pipe wall, it has great effects in terms of maintenance, such as shortening processing time, saving heat sources, and reducing repair costs. Furthermore, this device is advantageous in terms of manufacturing since it consumes no power and has a simple structure. In particular, since the thermal effect has been dramatically improved compared to the conventional method, there is an advantage that the conventional thermal effect can be maintained with a smaller rotary retort furnace.

(2) Since a plurality of individual beaters are connected to form a beater member with a length corresponding to the length of the furnace core tube, thermal deformation (torsion, etc.) of the beater member can be absorbed at the connecting part, and If a part of the beater member is damaged, repairs can be made simply because the beater in that part can be replaced. Also, since it can be disassembled, it is easy to attach and remove it from the furnace core tube.

(3) Since the beaters are connected by eliminating the axial gap between the blades of the beaters, it is possible to completely scrape off the material to be treated that is deposited on the inner circumferential surface of the furnace core tube.

[Brief explanation of drawings]

FIG. 1 is a front sectional view showing an embodiment of a rotary retort furnace using a beater member according to the present invention, FIG. 2 is a side sectional view showing the − section of FIG. 1, and FIG.
The figure is a perspective view showing one embodiment of the beater member. 1... Rotating retort furnace, 2... Furnace core tube, 3...
Heat retention section, 5... Heating section, 17... Motor, 22...
...beater member, 22a...beater unit, 24
...wing pieces.

Claims (1)

[Claims] 1 3 radially at intervals of approximately 120° centering on the shaft
A convex portion and a concave portion for connection are provided on one side and the other side of a single beater with protruding blades, respectively, and by fitting the convex portions and concave portions of adjacent single beaters, the blades can be connected to each other. By connecting multiple beaters without any axial space between them, the beater is formed to have a diameter smaller than the inner diameter of the furnace core tube and shorter than the length of the furnace core. A beater member for a rotary retort furnace.