JPS6015763Y2 - Asphalt plant dryer - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a dryer for an asphalt plant.

Conventional dryers for asphalt plants scrape aggregates up to the upper layer of the rotating cylinder around the flame part of the heating burner that blows into the rotating cylinder to prevent the aggregate from coming into direct contact with the flame part of the heating burner and deteriorating its quality. Instead of stirring at the bottom, the material was stirred and conveyed at the lower periphery.

As a result, the aggregate is unevenly distributed around the lower circumference of the rotating cylinder, and the internal space of the rotating cylinder is not used effectively to heat the aggregate, causing the surface temperature of the rotating cylinder around the flame part of the heating burner to become extremely low. It reached a high temperature and a large amount of heat was dissipated to the outside.

By the way, Japanese Unexamined Patent Publication No. 55-68906 describes that an L-shaped baffle plate is provided around a rotating cylinder to transport aggregates and the like in a rotational manner.

However, in the same publication, when loading aggregates etc. on the baffle plate at the lower circumference of the rotary cylinder, the aggregates etc. tend to pass along the lower circumferential surface, which is inefficient. In this method, aggregates and the like fall down on the way and come into direct contact with the heating burner and are likely to deteriorate in quality, and also disturb the cylindrical flame section, reducing the efficiency of heating and drying the aggregates and the like.

The present invention was developed in view of the above-mentioned drawbacks.It prevents the aggregates, etc. to be supplied from passing through the lower periphery of the rotating cylinder, making it easy to mount it on a rotating conveyor. The structure is such that the aggregates, etc. are rotated around the entire circumference of the rotating cylinder around the flame section of the heating burner without falling into the flame section, with the aggregates etc. falling in the middle of the upper layer of the cylinder. This makes it possible to effectively utilize the internal space of the rotary tube and heat the aggregates, etc., and prevent the rotary tube from being overheated due to the aggregates, etc. being conveyed by rotating around the inner circumference of the rotary tube. An object of the present invention is to provide a dryer for an asphalt plant in which the heating efficiency of the asphalt plant can be significantly improved.

The present invention will be explained below based on examples.

1 to 3 show a dryer 1 according to an embodiment of the present invention, in which a rotary cylinder 2 of a predetermined size is pivotally attached to a base 4 so as to be rotatable at a predetermined speed by a moving device 3, and the A supply chute 5 for supplying aggregate is disposed on one side, and a heating burner 6 for heating the aggregate and a discharge chute 7 are disposed on the other side, and the aggregate supplied from the supply chute 5 is transferred to the rotary cylinder 2. While being stirred and conveyed within the interior, the materials are heated in a predetermined manner so that they can be sequentially discharged from a discharge chute 7.

As shown in Figs. 1 and 2, the inner peripheral part around the flame part 8 blown by the heating burner 6 on the heating burner 6 side of the rotating cylinder 2 has a cross section for rotating and conveying the aggregate along the inner peripheral surface. A substantially U-shaped rotating conveyance device 9 is disposed around the inner circumferential portion at a constant pitch so that the recessed portions 10 respectively face the inner circumferential surface.

In order to make it easier to scrape up the aggregate, the rotating transport device 9 widens the distance between the side end of the rotary cylinder 2 in the direction of rotation and the inner circumferential surface, and narrows the distance between the other end and the inner circumferential surface. Then, as shown in FIG.
They are attached to each other through.

Furthermore, as shown in FIGS. 2 and 3, stirring blades 13 are provided around the inner circumferential surface of the rotary cylinder 2 so as to face the recessed portions 10 of the rotating conveyance device 9. The inner circumferential portion can be efficiently rotated and conveyed along the rotational conveyance device 9 along the inner circumferential portion.

When the aggregate is supplied from the supply chute 5, the aggregate is sequentially conveyed toward the heating burner 6 while being stirred in the rotary cylinder 2.

The aggregate conveyed to the flame section 8 on the side of the heating burner 6 is
As shown in the figure, the column is efficiently loaded onto the concave portion 10 of the rotating conveyance device 9 in order through a labyrinth-like passage formed by the lower peripheral surface of the rotating cylinder 2, the stirring blade 13, and the rotating conveyance device 9.
It is transported to the upper circumference of the rotary cylinder 2.

At this time, as shown in the figure, the side end of the rotating conveyance device 9 in the rotational direction is located a little far from the inner circumferential surface of the rotary tube 2, and the other end on the opposite side is arranged so as to be close to the inner circumferential surface of the rotary tube 2. As a result, the aggregate easily enters the recessed portion of the rotating conveyance device, making it difficult for the aggregate to come out downward, and the amount of aggregate to be loaded can be increased.

Then, at the point where it passes the upper circumference of the rotary cylinder 2 above the end of the flame section 8, the aggregate loaded in the recessed part 10 of the rotating conveyance device 9 rotates downward and sequentially toward the lower part as shown in the figure. The aggregate remaining in the recessed portion 10 also falls one after another as the rotary cylinder 2 rotates toward the lower circumference.

While repeating the above-mentioned operations, the aggregate is conveyed in a circular motion along the inner periphery of the rotary tube 2 without falling into the flame section 8 in the center, and then sequentially from the discharge chute 7 on the other side. It is something to be excreted.

In this way, the aggregate can be conveyed in a circular motion along the entire circumference of the heating tube around the flame section, so the aggregate is heated by the radiant heat of the flame of the heating burner and the convection conduction heat, and the inner circumference of the rotating tube is heated. It is possible to prevent overheating, prevent wasteful heat dissipation to the outside as in the conventional case, and improve the heating efficiency of the dryer.

According to experimental results, for example, in a conventional rotating cylinder, the surface temperature around the flame part of the heating burner was heated to 350 to 400 degrees Celsius, as shown by the dotted line in Figure 4, but in this example, the surface temperature around the flame part of the heating burner was heated to 350 to 400 degrees Celsius, as shown by the solid line in this example. As shown in FIG.

In addition, even though the aggregate is conveyed in a circular motion along the inner circumferential surface of the rotating cylinder, the aggregate hardly falls into the flame area of the heating burner, so the aggregate does not come into direct contact with the flame and generate carbon. , incomplete combustion: a condition that can be prevented from occurring.

FIG. 5 shows another embodiment of the rotary conveyance device 9 of the present invention, in which interval adjustment members 14 and 15 are attached to both sides of the channel-shaped rotary conveyance device 9 so as to be able to protrude toward the inner peripheral surface of the rotary cylinder 2. They are attached using tools 16 and 17, and are arranged along the length of the rotating conveyance device 9, respectively.

In this embodiment, the rotating conveyance device can be adjusted appropriately according to the amount of aggregate supplied, the amount of expansion of the flame part of the heating burner, etc., and it is possible to easily obtain a device that matches the heating and drying capacity of the dryer. It is something.

Note that the rotating conveyance state of the aggregate can also be adjusted by fixing the rotating conveyance device to the fixing table at a predetermined inclination angle via a spacer or the like having an appropriate slope.

Further, the number of constituent members of the rotating conveyance device can be set to an appropriate number depending on the diameter of the rotary cylinder and the capacity of the dryer.

In the above embodiments, an explanation has been given of a device that supplies aggregate to a dryer, but it can also be applied to a mixture of bitumen or the like and aggregate.

As described above, in the present invention, aggregates, etc. can easily enter the recessed portion of the rotating conveyance device having a substantially U-shaped cross section at the lower circumference of the rotary tube of the dryer, and can be moved along the lower circumferential surface of the rotary tube. In addition to loading as many aggregates as possible onto the rotating conveyance device so that they can be scraped up and rotated, it is also possible to prevent the scraped up aggregates from falling as much as possible in the middle of the upper periphery of the rotating cylinder. This prevents aggregates from coming into direct contact with flames and deteriorating in quality.

Furthermore, it is possible to prevent aggregates, etc. from falling and disturbing the cylindrical flame of the heating burner, and it is possible to carry them around the inner circumference of the rotating cylinder around the flame part, making the internal space of the rotating cylinder advantageous. It can be used to effectively heat aggregates, etc., and prevent the rotating tube from being overheated due to the aggregates, etc. being conveyed by rotating around the inner circumference of the rotating tube, and the heating efficiency of aggregates, etc. can be significantly improved. be.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway schematic front view of an embodiment of the present invention;
Fig. 2 is an enlarged side cross-sectional view of the same as the above with a part omitted, Fig. 3 is an enlarged side cross-sectional view of the rotating conveyance unit of the same as the above, Fig. 4 is a temperature distribution diagram of the rotary cylinder of the same as the above, comparing the conventional temperature distribution. The figure is an enlarged side sectional view of another embodiment of the rotating conveyance device section same as above. 1...Dryer, 2...Rotating tube, 6.
... Heating burner, tail ... Flame part, 9...
... Rotating conveyance device, 10 ... Recessed part, 1
3... Stirring blade.

Claims (1)

[Scope of utility model registration request] A rotating conveyor device with a substantially U-shaped cross section is installed on the inner periphery of the rotating cylinder of the dryer, which rotates and dries the supplied aggregates, etc., around the flame section of the heating burner for heating the aggregates. The - side end facing the surface and on the rotation direction side is a little far from the inner circumferential surface of the rotating tube, and the other side end on the opposite side is close to the inner circumferential surface of the rotating tube, evenly at a constant pitch. When the rotating transport devices rotate upward from the lower periphery of the rotary cylinder, aggregates, etc. that have been supplied to the dryer are loaded into the respective recesses, pass through the upper layer, and then rotate to the lower periphery. Stirring blades are respectively protruded on the inner peripheral surface of the rotary cylinder so that the aggregates, etc. can fall one after another when descending, facing approximately the center of the recessed part of the rotating conveyor, so that the recessed part side forms a labyrinth-like passage. Asphalt plant dryer characterized by: