JPH0255709B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotary retort furnace for heat-treating powder and granular materials.

[Conventional technology]

Traditionally, oxidation and reduction of metal powders such as iron,
There is a rotary retort furnace for drying and roasting foods, etc., and for heat treatment of fine powder such as frying, which is related to an application filed by the present applicant (Japanese Patent Laid-Open No. 1983-1993).
Publication No. 84077).

In FIGS. 1 and 4, a rotary retort furnace 1 has a cylindrical furnace core tube 3 mounted on the upper surface of an underframe 2 in a slightly inclined state so that the discharge port 3a is located below the insertion port 3b, and the rotary retort furnace 1 is installed in a substantially horizontal direction. It has been placed. This furnace core tube 3
The outer periphery of is surrounded by a heat retaining part 4 made of heat-resistant furnace material. A heating section 5 is arranged between the heat retaining section 4 and the furnace core tube 3. A screw-shaped guide vane 6 and a supply hopper 7 communicating above the guide vane 6 are provided on the insertion port 3b side of the furnace core tube 3. The guide vanes 6 and the furnace core tube 3 are rotated at predetermined rotational speeds by drive motors 19 and 8, respectively. The inner surface of the furnace core tube 3 is formed into a smooth surface, and a beater member 9 is arranged in the axial direction inside.
are arranged. This beater member 9 consists of a plurality of beaters 1 arranged in the axial direction as shown in FIG.
0 are removably connected. Each beater 1
0 has a plurality of blades 12 formed at equal intervals in the radial direction of the shaft tube 11.

Two protrusions 13, 1 are provided on one end surface of the shaft tube 11.
3 is formed, and two recesses 14 are formed on the other end surface, and by fitting the projections 13 into the recesses 14, each beater unit 10 is connected without relative rotation.

As the furnace core tube 3 rotates, the beater member 9 also rotates so that the inner wall surface of the furnace core tube 3 rolls, and each time the wing pieces 12 fall down, they strike the furnace core tube 3, thereby reducing the impact and scraping action. This prevents the material to be heat-treated from adhering to the inner wall of the furnace core tube 3.

[Problem that the invention seeks to solve]

However, in the furnace core tube 3, the discharge port 3a side is the insertion port 3b.
Because it is slanted so that it is located lower than the side,
The beater unit 10 on the side of the discharge port 3a receives the component force of the load of the other beater unit 10, and rotational friction becomes large, and the rotational speed becomes slow. Furthermore, since the resistance of the object to be heat treated is also non-uniform within the furnace core tube 3, the rotational speed of each beater 10 is further different. As a result, there is a problem that torsional moment and shear force act on the two protrusions 13, 13, causing them to be easily damaged.

The present invention was devised to solve the above-mentioned problems, and aims to prevent damage to the beater itself, as well as to simplify the structure and facilitate assembly.

[Means for solving problems]

In the present invention, a furnace core tube rotated by a drive motor is provided in a substantially horizontal direction, a beater member is arranged in the axial direction inside this furnace core tube, and the beater member has blades arranged radially on the outer periphery of the shaft tube. In a rotary retort furnace in which a plurality of single beaters are removably connected without leaving an axial gap between the wing pieces, a protrusion is formed at the center of one end surface of the shaft tube, and a projection is formed at the center of the other end surface. The structure is such that a recess is formed into which the projection is rotatably inserted.

[Effect]

Even if the rotational speeds of adjacent beaters are different, since the protrusion of the shaft tube portion rotates within the recess, no torsional moment acts on the protrusion.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIG. 1, a rotary retort furnace 1 has a horizontally elongated box-shaped heat retaining section 4 placed on an underframe 2. As shown in FIG. The heat retaining section 4 is made of a heat-resistant furnace material and has a rectangular through hole 4a formed in the longitudinal direction, and a heating section 5 is provided on the inner wall surface of the through hole 4a. A cylindrical furnace core tube 3 is provided in the through hole 4a.
is inserted, and both ends protrude. An introduction pipe 15 communicating with the lower end of the supply hopper 7 is inserted into the insertion port 3b at one end thereof. A screw-shaped guide vane 6 is disposed within the introduction pipe 15, and its rotating shaft 6a is rotationally driven by a drive motor 19 via sprockets 16, 17 and a chain 18 meshing with these.

Note that the underframe 2 is provided with a tilting device (not shown), and is tilted so that the discharge port 3a of the furnace core tube 3 is lower than the insertion port 3b, so that the object to be heat treated can easily move.

Flanges 20 are formed near both ends of the furnace core tube 3. This flange 20 is connected to a pair of supporting members 22 provided at both ends of the underframe 2 via buffer members 21, 21 fixed to the flange 20, respectively.
It is rotatably supported by 22. The rotation of the drive motor 8 is transmitted to the one flange 20 via sprockets 23, 24 and a chain 25.

Note that 31 is a side roller for preventing the furnace core tube 3 from shifting in the horizontal direction due to thermal expansion and inclination. The flange 2 supports a rotatable roller at its tip and rotates on the circumferential surface of the roller.
0, and one to several pieces are installed depending on the size of the retort furnace.

A beater member 9 is disposed inside the furnace core tube 3 in the axial direction. This beater member 9 has a plurality of beaters 10 connected detachably in the axial direction. In this beater unit 10, three blades 12 are formed radially on a shaft tube 11 at predetermined intervals.

A projection 13 is provided at the center of one end surface of the shaft tube 11.
is formed, and a recess 14 into which the projection 13 fits is formed on the other end surface.

As shown in FIG. 1, a thrust member 27 is attached to the beater unit 10 on the insertion port 3b side of the beater member 9.
The projection 13 is inserted into the shaft hole of the thrust member 27 . The rotating shaft 6a of the guide vane 6 is in contact with the thrust member 27. Also,
A short shaft portion 28 is welded to the center of the shaft tube 11 of the beater unit 10 on the discharge port 3a side. This short shaft portion 28
The shaft hole 29a of the thrust member 29 is passed through the shaft hole 29a, and the shaft abuts against a bearing disc 30 formed at the center of the discharge port 3a.

Next, the operation of the above embodiment will be explained.

As the furnace core tube 3 rotates, the beater member 9 also rotates. At this time, if the resistance acting on each beater unit 10 is different, the rotational position of each beater unit 9 is shifted, as shown in FIG. 3, and the torsional moment acting on the protrusion 13 is absorbed to prevent damage thereto.

Further, although the above embodiment shows that the protrusion 13 fits into the recess 14, the diameter of the recess may be increased, and the protrusion may be loosely fitted into the recess and rotated within the recess. In such a structure, each beater 10 is connected to another beater 10.
can be rotated separately without being hindered in its rolling motion. Therefore, not only torsion moment but also shear force does not act on the protrusion 13, which has the effect of making it more difficult to break. [Effects of the Invention] As is clear from the above description, according to the present invention, a protrusion is formed at the center of one end surface of a single beater,
Since the protrusion is inserted into the other end surface so that the beater member can rotate relative to each other, damage to the beater member can be prevented, and the structure can be simplified and assembly can be facilitated.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a rotary retort furnace showing an embodiment of the present invention and a conventional example, Fig. 2 is an exploded perspective view of a beater member, Fig. 3 is a sectional view taken along the - line in Fig. 1, and Fig. 4. is an exploded perspective view of a conventional beater member. 1... Rotating retort furnace, 3... Furnace core tube, 9...
Beater member, 10... Beater alone, 11...
Axial tube, 12...wing piece, 13...protrusion, 14...recess.

Claims (1)

[Scope of Claims] 1. A furnace core tube rotated by a drive motor is provided in a substantially horizontal direction, a beater member is arranged in the axial direction inside this furnace core tube, and the beater member has blades on the outer periphery of the shaft tube. In a rotary retort furnace in which a plurality of individual beaters each having radial blades are removably connected without leaving an axial gap between the blades, a protrusion is formed at the center of one end surface of the shaft tube. A rotary retort furnace, characterized in that the other end face is formed with a recess into which the projection is rotatably inserted.