JPS5934565Y2 - Heating device for gravel, etc. - Google Patents

Description

[Detailed description of the invention] This invention relates to a new heating device for gravel, etc., and is particularly suitable for preheating gravel, which is a material for asphalt, using waste gas of around 300°C discharged from rotary kilns, etc. This device aims to provide a new heating device for gravel, etc., which has an outer cylindrical body installed approximately vertically with an input port for gravel, etc. at the top, and an inner cylinder installed approximately vertically inside the outer cylindrical body. A cylindrical body, an outer spiral tank provided on the inner wall of the outer cylindrical body such that the tip thereof is appropriately spaced from the inner cylindrical body, and the spiral shelf formed on the inner wall surface of the outer cylindrical body. an inner spiral tank provided on the outer circumferential surface of the inner cylindrical body so as to fit into a spiral groove and to be appropriately spaced from the outer spiral tank and the outer cylindrical body;
a heating object collecting means provided below both spiral shelves, the top end portion of the outer spiral tank and the front end portion of the inner spiral tank overlap in planar position; It is characterized in that the cylindrical body is provided with a hot air supply hole for introducing hot air into the space between the outer cylindrical body and the inner cylindrical body.

The details of the present invention will be explained below based on illustrated embodiments.

In the figure, 1 is an iron outer cylinder.

The outer cylindrical body 1 is installed substantially vertically on the ground or on a turret or the like, and has a circular cross-sectional shape.

The outer cylinder 1 has, for example, a diameter of about 3 m and a height of about 20 m.

Reference numeral 2 denotes an inlet for introducing gravel or the like formed in the upper part of the outer cylinder 1, for example, in the center.

Reference numeral 3 denotes an iron inner cylinder provided inside the outer cylinder 1, which has a circular cross section and a conical head 4.

The inner cylinder 3 has a vertically fixed portion 4 on the bottom 5 of the outer cylinder 1.
It is supported coaxially with the outer cylindrical body 1 by book supports 6, 6, 6.6.

7, 7.7 are stays provided between the outer periphery of the upper end of the inner cylindrical body 3 and the inner wall of the outer cylindrical body 1. Support for the body 3 is assisted.

8 is an iron outer spiral tank provided on the inner wall of the outer cylinder 1;
The tip thereof is appropriately spaced from the outer circumferential surface of the inner cylindrical body 3.

Reference numeral 9 denotes an inner spiral tank made of iron provided on the outer peripheral surface of the inner cylinder body 3, and has a pitch that is approximately the same as that of the spiral shelves 8. There is a phase difference in pitch.

The tip of the inner spiral tank 9 is appropriately spaced from the inner wall of the outer cylinder 1, and the tip half of the spiral shelf 9 and the outer spiral shelf 8
The planar position is made to overlap with the tip side half of the.

Reference numeral 10 denotes a hot air supply hole provided in the outer cylindrical body 1, and is provided at a position where hot air can be introduced below the space between the outer cylindrical body 1 and the inner cylindrical body 3.

Reference numeral 11 denotes a hot air supply pipe provided outside the outer cylinder 1, which communicates with the inside of the outer cylinder 1 through the hot air supply hole 10.
The axis thereof is arranged substantially along the upward tangential direction of the inner spiral shelf 9 or the outer spiral shelf 8.

Reference numeral 12 denotes a funnel body made of iron, which has an outer diameter large enough to fit neatly into the outer cylinder body 1, and has an outer spiral shelf 8 and an inner spiral shelf 9.
and is fixed to the inner wall of the outer cylinder 1 below the inner cylinder 3.

13.13, 13.13 are insertion holes formed in the funnel body 12, and the struts 6, 6, 6 are inserted into the throttle holes 13, 13°13.13.
．． 6 is inserted.

In addition, two of the four insertion holes 13, 13, 13.
3.13 is not shown for convenience.

14 is a belt conveyor that conveys gravel and the like falling from the central opening 15 of the funnel body 12 to the outside of the outer cylinder body 1.

Reference numeral 16 designates an outlet for gravel, etc., formed in the outer cylinder 1, and reference numeral 17 designates a slit through which the belt 18 passes.

Next, heating of gravel etc. 19 using the heating device explained above will be explained.

The hot air supply pipe 11 is connected to a suitable hot air source.

For example, when using it to preheat gravel used as asphalt aggregate, it is recommended to use waste hot air from a nearby rotary kiln.

Then, the hot air is introduced into the outer cylinder 1 through the hot air supply hole 10, spirals upward along the outer spiral shelf 8 and the inner spiral shelf 9, and enters the input port for gravel, etc. at the upper part of the outer cylinder 1. 2 is discharged to the outside.

In this case, the hot air escapes upward in a spiral manner through the spiral shelves 8 and 9 provided on the outer cylinder 1 and the inner cylinder 3, so that every corner of the space between the outer cylinder 1 and the inner cylinder 3 is This allows the hot air to spread even further, improving the heat transfer efficiency to the heated object.

In the illustrated embodiment, the hot air supplied into the outer cylindrical body 1 is discharged upward, but it is preferable to collect it at the upper part of the outer cylindrical body 1 and reuse it.

Furthermore, when disposing of hot air, it is actually necessary to pass it through a dust removal device.

Then, a gravel cylinder 19 is supplied from the input port 2 for gravel, etc.

Although this supply means is not shown in the drawings, it may be carried out as appropriate using ordinary means such as a basket elevator.

Gravel, etc. 19 thrown in from the input port 2 falls onto the triangular pyramid-shaped head 4 of the inner cylinder 3, and further rolls down the slope and falls onto the upper surfaces of the outer spiral shelf 8 and the inner spiral shelf 9.

Part of the gravel, etc. 19 that has fallen onto the upper surfaces of the spiral shelves 8 and 9 rolls along the surfaces of the spiral shelves 8 and 9, and the rest rolls along the spiral shelves 8 and 9.
deposit on top.

When the angle of the slope of the accumulated gravel, etc. 19 becomes equal to or greater than the angle of repose, the gravel, etc. 19 thrown in later rolls on the slope, and from the outer spiral shelf 8 onto the inner spiral shelf 9, and the inner spiral shelf. From the spiral shelf 9 it falls onto the outer spiral shelf 8.

By repeating this process, the gravel etc. 19 gradually moves downward and finally falls onto the funnel body 12 from the spiral shelves 8 and 9.

It should be noted that some of the objects to be heated that have once been piled up on the spiral shelf 8.9 may roll out due to the falling impact of new objects to be heated that are subsequently thrown in and fall.

In this embodiment, each spiral shelf 8, 9 is not particularly sloped in the direction from the base end to the distal end. It may also be made to slope downward as it goes.

In this way, it is possible to prevent gravel etc. 19 from accumulating on the spiral shelves 8 and 9, and as a result, a large amount of gravel etc. 19 can be prevented.
9 can be prevented from being wasted in the heating device.

In this case, the angle of inclination of the spiral shelf in the transverse direction does not necessarily have to be greater than the angle of repose.

Even if the inclination is below the angle of repose, there is a falling impact of the heated objects falling one after another, so it is possible to prevent almost all the heated objects from accumulating on the spiral shelves 8 and 9.

As described above, gravel, etc. 19 is input from the input port 2, moves downward over a relatively long period of time, and is supplied into the outer cylindrical body 1 during the process of falling onto the funnel body 12. It comes in contact with hot air and is heated.

Then, the gravel etc. 19 that fell onto the funnel body 12 is removed from the funnel body 1.
Roll down the slope of 2 and go to the center entrance 15 of the belt conveyor 1.
4, and is carried out of the outer cylinder 1 by the belt conveyor 14, and is carried to the next step, for example, a mixer step in which the gravel, etc. 19 and pitch are mixed to produce asphalt.

As described above, in the heating device of the present invention, the spiral shelves of the outer cylindrical body and the inner cylindrical body provided inside the outer cylindrical body do not come into contact with each other, and the planar positions of their tip sides overlap. Since the object to be heated, such as gravel, is repeatedly dropped from one spiral shelf to the other spiral shelf, and from the other spiral shelf to one spiral shelf, the object to be heated is heated over time. At the same time, the hot air introduced into the cabin is directed upward in a spiral along the spiral shelf, so that the hot air reaches every corner of the space between the outer cylinder and the inner cylinder. It can be made to cross.

Therefore, the hot air can be brought into sufficient contact with the object to be heated, and the exchange efficiency can be increased despite the simple structure.

Since the heating device of the present invention is as described above, when used for preheating asphalt aggregate, for example, the energy saving effect is tremendous.

That is, currently, asphalt aggregate is heated to approximately 175 to 180°C using a rotary kiln before use.

However, it is generally said that the thermal efficiency of a rotary kiln is approximately 33% in theory.

Therefore, if the waste hot air from the rotary kiln is used as the hot air for the heating device of the present invention, the aggregate can be preheated before being put into the rotary kiln, and valuable fuel can be used without wasting it.

Although the heating device of the present invention has been described above mainly as a means for preheating aggregate, it is not limited to this, and can of course be used in other fields as well.

For example, if it is used to dry grain, dust will be blown up at the same time as drying, so it can also be used for dry cleaning.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an example of the implementation of the gravel heating apparatus of the present invention, and FIG. 2 is a sectional view taken along line II--II in FIG. 1. Explanation of symbols 1...Outer cylinder, 2...Inlet for gravel, etc., 3...Inner cylinder, 8...
Outer spiral tank, 9... Inner spiral machine, 10...
... Hot air supply hole, 12 ... Heated object collection means.

Claims (1)

[Scope of utility model registration request] An outer cylindrical body that has an input port for gravel or the like at the top and is installed approximately vertically, an inner cylindrical body that is installed approximately vertically inside the outer cylindrical body, and a tip that is appropriately spaced from the inner cylindrical body. an outer spiral tank provided on the inner wall of the outer cylinder body; and a spiral shelf that enters a spiral groove formed on the inner wall surface of the outer cylinder body, and the outer spiral tank and the outer cylinder body. an inner spiral tank provided on the outer circumferential surface of the inner cylindrical body so as to be appropriately spaced from the inner spiral tank, and a heating object collection means provided below both spiral shelves; hot air for introducing hot air into the space between the outer cylinder and the inner cylinder so that the planar positions of the part and the front end side part of the inner spiral tank overlap, and A heating device for gravel, etc., characterized by having a supply hole.