JPH03297373A - Heating system for bulky material - Google Patents

Abstract

PURPOSE:To heat a bulky material uniformly by revolving a vessel having an inversely conical, inner peripheral wall surface around its center axis and by heating a bulky material using a heating means while circulating said bulky material with a guide plate installed on the vessel. CONSTITUTION:A guide plate 35 is installed near the opening end of a vessel 30 having an inversely conical, inner peripheral wall surface so as to be tilted toward the inside of the vessel in relation to the revolving direction. A bulky material m, through the revolution of the vessel, is raised along the wall surface through centrifugal force while put to revolving motion, and circulated into the vessel through the guide plate. And a heating means 39 heats the bulky material m.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a heating device for bulk materials.

[Conventional technology and its problems]

For example, a device is widely known that roasts and dries granular material (coffee beans) by applying heat from above using a heat source while rolling the material through horizontal rocking motion. FIG. 4 shows a schematic diagram of this conventional roasting machine.

In Figure 4, a material (coffee beans) m is placed in a low cylindrical container (1), and a heat source (2) is placed above the opening of the container (1). There is. Further, a crankshaft (3) hangs down from the center of the low wall of the container (1), and the lower end of the crankshaft (3) is connected to an electric motor (4). When the electric motor (4) is driven, the center of the container (11) and the center of the rotation axis of the electric motor (4) do not match, so
The container (11 rotates eccentrically. This causes the container (1)
The material m in the container (1) performs a horizontal rocking motion, and the material m in the container (1) rolls. Furthermore, the material m is rolled while being exposed to a heat source (2
), which gives it heat, roasts it, and dries it.

In the roasting machine configured as described above, transfer is performed, but there is almost no mixing action between the lower layer and the upper layer (because of only horizontal rocking motion), the layer of material is thickened (then only the top of the layer is charred). This results in uneven baking, and in order to increase the capacity, it is necessary to make the layer of material thinner, and in some cases, to make it a single layer, the area of the container must be widened, which also increases the installation area. Maintenance also becomes difficult.

In view of the above-mentioned problems, the present applicant has previously proposed a heating dryer for bulk materials that can uniformly heat (roast) and dry bulk materials even when the layer of material is thick. A container having an annular space is vibrably supported, and a torsional vibration force is applied to the container to cause the bulk material in the annular space to move around in the annular space along with rotational movement in the cross section, and to dispose the bulk material in close proximity to each other. We have proposed a heating dryer for bulk materials, which is characterized by heating and drying using a heating means provided (Japanese Patent Application No. 159639/1983).

FIG. 5 shows a heating dryer for bulk materials according to this embodiment.
0) is a container that has a center tube (10a) formed at the center and a nongangular space with a 5-arc cross section between the center tube (10a) and the peripheral wall. A vibration drive unit (11) is fixed to the bottom wall of the container (lO), and this is, for example, a vibration electric motor. Further, the container (lO) is vibably fixed to the base (13) via a plurality of springs (12) attached to the bottom wall thereof.

Further, a discharge port (14) is provided at the bottom of the container (10), and a lid (15) is fixed to the open end of the discharge port (14) with bolts. A far-infrared radiator (heat source) is fixed to the opening of the container (10) by a method not shown, and this heat source (19) has an exhaust pipe (16) and a material supply pipe (17) at the positions shown. It is inserted and fixed. Also, the exhaust pipe (16
) is connected to a cyclone or blower (20) via a flexible tube.

Container (10) from input port (18) of material supply pipe (17)
A material (coffee beans) m is supplied within. Vibration drive unit (
11), a torsional vibration force is applied to the container (10). Since the container (10) has an annular space with an arc-shaped cross section, in other words, it has an arc-shaped side wall, the material m in the container (10) is moved by gravity along this side wall. It moves around the annular space while rotating in the direction shown by arrow A due to the operation and receiving torsional vibration force. That is, the material m performs a circular or elliptical compound three-dimensional movement (sliding movement), and the center tube fl
It moves in a spiral around the oal. Therefore, the material m is mixed and evenly roasted by absorbing heat evenly and directly into the inside (moisture) of the material m using the far-infrared radiator (19) at an even distance on average over time. The material m is roasted and dried. Dust and water vapor generated by mixing, roasting, and drying the material m are exhausted to the outside by a blower (20) or a cyclone through an exhaust pipe (16).The device is operated for a certain period of time. , roasted, dried ingredients m
is discharged from the discharge port (14) by removing the lid (work 5).

The apparatus for heating and drying bulk material previously proposed by the present applicant is constructed and operates as described above, and it is true that the uniformity of heating of the bulk material is improved compared to conventional apparatuses. However, although it is sufficient that the above-mentioned circumferential movement and rotational movement in the annular space are performed uniformly within the container (10), there may be an error in the center of gravity position of the container (10) or the vibration generator (11). Depending on the relative position of the container (10) with respect to the center of gravity, the container (10) may not always move in the ideal manner as described above, that is, it is often difficult to cause the material m to perform an ideal complex three-dimensional movement. , Therefore, in such a case, material m cannot be heated evenly (
Become.

[Problem that the invention seeks to solve]

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a heating device for bulk materials that can heat bulk materials more evenly than before.

[Means for Solving the Problems] The above object is to provide a container having an inner circumferential wall surface having an inverted circular female shape, a rotation drive means for rotating the container around its central axis, and an open end of the container. a guide plate disposed adjacent to the container and inclined to the left within the diameter of the container with respect to the rotation direction; and a heating means disposed adjacent to the open end of the container, By rotating the container with the rotation drive means, the bulk material is caused to move upward along the inner peripheral wall surface of the container by centrifugal force while being guided by the guide plate. This is achieved by a heating device for bulk material, characterized in that the bulk material is heated by the heating means by applying a circulation motion to circulate it back into the container.

[For production]

When a bulk material is put into a container and rotated around its central axis by a rotational drive means, the bulk material inside the container performs circular motion around its central axis, and its inner peripheral wall surface is Since it has an inverted conical shape, centrifugal force causes the inner peripheral wall to rise and pop out from the open end of the container. Due to the guide plate inclined to the left within the diameter, the loose material is moved by the inertial force while receiving the pressing force from the loose material inside the container, and is guided by the guide plate and returned to the container. That is, by repeating such a motion, a circumferential motion is added to it, and the bulk material can be heated more uniformly than before by the heating means disposed close to the open end of the container.

According to the previously proposed heating device for bulk materials, the container is supported so that it can vibrate, and a predetermined vibration force is applied to the container to generate circular motion and circulation motion for heating. For example, by rotating the container, circular motion and circulation motion are performed, so that the desired motion can be more reliably obtained. That is, the uniform heating properties of bulk materials can be further improved compared to the conventional method.

[Example 1] Hereinafter, a heating apparatus for bulk material according to an example of the present invention will be described with reference to the drawings.

1 to 3 show a heating device for bulk material according to an embodiment of the present invention, and in this embodiment, coffee beans m are used as the bulk material to be heated. In the figure, a container (30) for accommodating coffee beans m has a mortar-shaped, ie, inverted cone-shaped inner peripheral wall surface, and a conical protrusion [30a] is formed at the center bottom of the container (30).

Further, a flange portion (30b) is formed at the opening end,
Adjacent to this, a guide plate support ring [34] is fixed to the stationary part.

A rotating shaft (31) is fixed along the center line of the container (30), rotatably supported by a bearing (32) fixed to a stationary part (not shown), and rotated by an electric motor (33). It is designed to be rotated at a predetermined rotational speed.

As shown in FIG. 2, the guide plate support ring (34) has grooves on its inner peripheral wall that are inclined at predetermined angular intervals toward the left side within the diameter of the container (30) with respect to the rotational direction of the container (30). A plurality of guide plates (35) are attached. Also,
The far-infrared radiator (
39) is fixed to a stationary part (not shown). The far-infrared radiator (39) is made of ceramic, as is well known, and is configured to be heated by an electric heater embedded therein to emit far-infrared rays.

An exhaust duct (36) is located in the center of the far-infrared radiator (39).
) is fixed, which is connected to the blower (37). A coffee bean supply pipe (38) is further attached to the far-infrared radiator (39).

The coffee bean heating device according to the embodiment of the present invention is constructed as described above, and its operation will be explained next. First, it is assumed that coffee beans m are contained in a container (30) to a level as shown in FIG. After this, the electric motor (
When the rotating shaft (31) is rotated at a predetermined speed by the drive of the container (33), it receives centrifugal force due to the rotation while performing circular motion around the central protrusion (30a) of the container (30).
As a result, the coffee beans m rise along the inner peripheral wall surface of the container (30) in the direction of the arrow as shown in FIG.
However, the guide fixed to the inner circumferential wall of the guide plate support ring (34) disposed close to the open end of the lever By the plate (35), the inertia of the coffee beans m and the container (30)
The guide plate (3
5) and then fall toward the center of the container (30) as shown by the arrow in FIG. Since such a circular motion is performed together with the circumferential motion, the coffee beans m are uniformly mixed and stirred within the container (30), are uniformly radiated by the far-infrared radiator (39), and are therefore uniformly heated.

The embodiments of the present invention have been described above, but of course the present invention is not limited thereto, and various modifications can be made based on the technical idea of the present invention.

For example, in the above embodiments, the inner circumferential wall surface of the container (30) has an inverted conical shape, but it does not have to be exactly in an inverted conical shape. For example, even if it is in a bowl shape, the centrifugal force generated by the rotational force of the electric motor (33) may move up this inner circumferential wall.

Further, in the above embodiments, a far-infrared radiator was explained as the heating means, but an electric heater may be provided instead.

Further, although the guide plate (35) is formed in an arc shape in the above embodiment, it may be attached to the guide plate support ring (34) in a straight line, that is, by simply tilting the flat plate.

Further, in the above embodiment, the rotating shaft (31) is directly connected to the electric motor (33) to drive the rotating shaft (31), but it is also possible to use some kind of speed reduction mechanism to reduce the rotational speed to a desired rotation speed and rotate the rotating shaft (31).

In addition, in the above examples, coffee beans m are used as the bulk material.
However, instead of this, other bulk materials such as sesame or corn may be heated.

[Advantageous Effects of the Invention 1] As described above, according to the heating device for bulk materials of the present invention, the mixing and stirring action can be made more uniform than before, and the uniformity of heating can therefore be improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a coffee bean heating device according to an embodiment of the present invention, FIG. 2 is a plan view in the direction of the line ■-■ in FIG.
Fig. 3 is a partially enlarged sectional view of a pot explaining the operation of the same embodiment, Fig. 4 is a schematic diagram of a conventional roasting machine, and Fig. 5 is a partially broken view of another conventional heating device for bulk materials. FIG. In addition, in the figure, (30)................................... (33)... (39)・・・・・・・・・・・・Container Electric Machine Guide Plate Far-infrared ray radiator replacement Figure 3

Claims (2)

[Claims] (1) A container having an inner circumferential wall surface having a substantially inverted conical shape, and a rotational drive means for rotating the container around its central axis;
comprising: a guide plate disposed close to the open end of the container and inclined radially inward of the container with respect to the rotation direction; and a heating means disposed close to the open end of the container; By storing a bulk material in the container and rotating the container by the rotation driving means, the bulk material is caused to move up along the inner circumferential wall surface of the container by centrifugal force while making a circumferential movement; A heating device for bulk material, characterized in that the bulk material is heated by the heating means while being guided by a guide plate and circulated back into the container. (2) The heating device for bulk material according to claim 1, wherein the heating means is a far-infrared radiator, and the bulk material is coffee beans.