JP2000273814A - Dryer of asphalt plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the suction of excess external air by sealing a clearance between a drum and a hopper of a dryer satisfactorily. SOLUTION: One end of a heat-resistant seal material 16 is fixed substantially concentrically with a drum 2 in hoppers 6, 7 arranged in an end part of the drum 2, a wire 19 restricting a play end diameter of the seal material 16 is arranged in a play end part of the seal material 16, and the play end part of the seal material 16 is restricted by the wire 19 to bring it into contact with an outer peripheral face of the drum 2 substantially. Consequently, since the play end diameter of the seal material 16 is not changed even if a surface of the drum 2 comes into contact with the play end part of the seal material 16 and the seal material 16 itself is deformed, a slight clearance provided between the play end part of the seal material 16 and the drum 2 is not changed, and the suction of excess external air can be suppressed as much as possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dryer for an asphalt plant for heating and drying new aggregates and waste pavement in order to produce an asphalt mixture as a road pavement.

[0002]

2. Description of the Related Art A dryer of an asphalt plant supports a cylindrical drum rotatably and inclinedly between fixed hoppers, supplies hot air of a burner from a hopper at one end of the drum, and exhaust gas from a hopper at the other end. On the other hand, new aggregate or waste pavement is supplied into the drum from one side of the hopper and dried by heating to a predetermined temperature.

In the above-mentioned dryer, a slight gap is inevitably formed in the structure between the fixed hopper and the rotating drum. When outside air is sucked into the drum through the gap, the temperature of the hot air is lowered to reduce the temperature of the dryer. Since it is necessary to increase the processing capacity of the downstream dust collector, exhaust fan, etc. due to a decrease in the heating efficiency and an increase in the amount of the processing gas, which causes a problem of an increase in the cost of the apparatus, it is necessary to prevent external air suction. Seal mechanism.

As shown in FIG. 3, one end of a heat-resistant sealing material 102 is attached to a hopper 101 by a drum 1 as shown in FIG.
The hopper 10 is fixed so that the free end thereof is in contact with the outer peripheral wall of the drum 103.
The suction of outside air from the gap 104 between the drum 1 and the drum 103 is prevented. As a material used as the heat-resistant seal material, asbestos or glass fiber fiber, etc., which are excellent in heat resistance, are exclusively used on the burner side of the drum 102 because the drum surface temperature rises to about 200 ° C.
Note that a rubber plate or the like may be used as a sealing material on the side of the drum 102 opposite to the burner because the surface temperature of the drum becomes low.

[0005]

However, when plastic asbestos or glass fiber fiber is used as the sealing material as described above, if the outer peripheral surface of the drum once comes into contact with the sealing material with the rotation of the drum 102, the sealing material is used. 102
3 is turned up as shown by a two-dot chain line in FIG. 3 and does not return to its original state. As a result, a gap is formed between the sealing material 102 and the outer peripheral surface of the drum 103, and the sealing function is performed. There was a problem that it could not be fully demonstrated.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide a dryer for an asphalt plant in which a gap between a drum of the dryer and a hopper is sealed well so that excess outside air is not sucked.

[0007]

According to the present invention, in order to achieve the above object, one end of a heat-resistant sealing material is fixed to a hopper disposed at an end of a drum so as to be substantially concentric with the drum. At the same time, squeezing means for reducing the free end diameter of the sealing material is provided at the free end of the seal material, and the free end of the sealing material is squeezed by the squeezing means so that the free end of the sealing material is substantially brought into contact with the outer peripheral surface of the drum. It is characterized by having comprised.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS According to a dryer for an asphalt plant according to the present invention, one end of a heat-resistant sealing material is fixed to a hopper to close a gap between a drum and a hopper, and a free end of the sealing material is provided. The portion is squeezed by the squeezing means so as to substantially contact the drum outer peripheral surface. As a result, even if the outer peripheral surface of the drum comes into contact with the free end of the sealing material to deform the free end, the diameter of the free end itself does not always change because the free end diameter is narrowed by the throttle means, and the gap between the drum and the sealing material is not changed. The gap does not change. Therefore, it is possible to suppress excess outside air from being sucked from the gap between the drum and the hopper as much as possible, thereby increasing the heating efficiency of the dryer. Further, since the amount of exhaust gas can be suppressed by suppressing the outside air suction, the capacity of the downstream dust collector and the exhaust fan can be reduced, and the cost can be reduced by downsizing the devices.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

Reference numeral 1 in the figure denotes a dryer for heating and drying new aggregates and waste materials. The dryer 1 is rotatably inclinedly supported by a cylindrical roller 2 by a support roller 4 on a gantry 3 and has a driving device (not shown). To rotate at a predetermined speed. Reference numeral 5 denotes a burner for generating hot air, which sends hot air into the drum 2 from a hopper 6 disposed at one end of the drum 2.

The hot air that has passed through the drum 2 is led out of an exhaust flue 8 connected to a hopper 7 provided at the other end of the drum 2, and an exhaust fan (not shown) provided at the end of the exhaust flue 8. ) To maintain the gas flow passing through the drum 2 while discharging the exhaust gas from the drum 2 and passing it through a dust collector (not shown) disposed downstream of the drum 2 to release it into the atmosphere. are doing.

A conveyor 9 for material supply is provided on the hopper 7 side, and the material supplied by the conveyor 9 is scraped by scraping blades 10 provided along the inner peripheral portion of the drum 2. While being raised and rolling down the inside of the drum, it comes into contact with the hot air passing through the inside of the drum and rises in temperature to a desired temperature, and is discharged to the outside through a discharge port 11 provided at a lower portion of the hopper 6.

Reference numeral 12 denotes a seal mechanism for closing a gap 13 formed in a portion where the fixed hoppers 6 and 7 and the rotating drum 2 overlap with each other. As shown in FIG. A support plate 15 is fixed to the piece 14 along the circumference of the drum 2, one end of a heat-resistant sealing material 16 is placed on the support plate 15, and is disposed substantially concentrically with the drum 2. And is fixed by a bolt nut 18 as a fastener.

The sealing member 16 is preferably made of asbestos, glass fiber fiber or the like having excellent heat resistance, but an appropriate material may be selected according to the drum surface temperature. The free end of the sealing material is turned back to form a ring 16a, and a wire 19 having heat resistance is inserted into the ring 16a as a means for narrowing the free end. The wire 19 may be asbestos, glass fiber fiber, steel wire, or the like.

The opening of the free end of the sealing material 16 is narrowed by appropriately squeezing the wire 20, and the free end is tied so as to substantially contact the outer peripheral surface of the drum 2. At this time, the sealing material 1
Rather than tightly binding the free end of the drum 6 to the drum 2, a slight gap is provided so that the sealing material 16
The free end of the is not rotated with it. In addition, although the thing which inserted the wire 20 in the ring 16a formed in the free end part of the sealing material 16 as said squeezing means was shown, it is not limited to this and a wire or a belt is sewn to the free end. What is necessary is just to be able to squeeze the free end. For example, this seal mechanism is adopted only on the high temperature side of the hopper 6 side, and the hopper 7 side is a conventional seal mechanism. A rubber plate or the like may be employed.

Thus, the wire material 20 is squeezed and the sealing material 16 is squeezed.
When the drum 2 is rotated, the outer peripheral surface of the drum is closed when the opening of the free end of the drum 2 is narrowed and the free end is substantially abutted against the outer peripheral surface of the drum 2 with a slight gap. −
At this time, even if the drum surface contacts the free end of the seal member 16 and the seal member 16 itself deforms, the seal member 16 rotates. Since the free end diameter does not change, the slight gap provided between the free end of the sealing material 16 and the drum 2 does not change. Further, even if the free end diameter changes due to aging, it can be easily adjusted by squeezing and re-binding the wire 20.

As described above, since the free end of the seal member 16 can be kept in almost constant contact with the outer peripheral surface of the drum 2, excess outside air is sucked from the gap 104 between the drum 2 and the hoppers 6 and 7. The heating efficiency of the dryer 1 can be increased as much as possible, and the amount of exhaust gas can also be reduced by suppressing the outside air suction, so that the capacity of downstream dust collectors and exhaust fans can be reduced, and the cost of these devices can be reduced. Can also be planned.

[0018]

As described above, in the dryer of the asphalt plant according to the present invention, one end of the heat-resistant sealing material is formed on the hopper disposed at the end of the drum so as to be substantially concentric with the drum. At the same time, a narrowing means for reducing the free end diameter of the seal material is provided at the free end of the seal material, and the free end of the seal material is narrowed by the narrowing means so as to substantially contact the outer peripheral surface of the drum. Therefore, it is possible to minimize the suction of excess outside air from the gap between the drum and the hopper, thereby increasing the heating efficiency of the dryer. Further, since the amount of exhaust gas can be suppressed by suppressing the outside air suction, the capacity of the downstream dust collector and the exhaust fan can be reduced, and the cost can be reduced by downsizing these devices.

[Brief description of the drawings]

FIG. 1 is a partially cutaway schematic explanatory view showing one embodiment of the present invention.

FIG. 2 is an enlarged sectional view of the seal mechanism of FIG.

FIG. 3 is a diagram corresponding to FIG. 2 showing a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Dryer 2 ... Drum 5 ... Burner 6, 7 ... Hopper 8 ... Exhaust flue 12 ... Sealing mechanism 16 ... Sealing material 19 ... Wire rod (throttling means)

Claims (1)

[Claims] An end of a heat-resistant sealing material is fixed to a hopper disposed at an end of the drum so as to be substantially concentric with the drum, and a free end of the sealing material is attached to a free end of the sealing material. A dryer for an asphalt plant, characterized in that a squeezing means for squeezing the end diameter is provided, and the free end of the sealing material is squeezed by the squeezing means so as to substantially contact the outer peripheral surface of the drum.