JP3881089B2 - Asphalt recycled material heating equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heating apparatus for asphalt recycled material.
[0002]
[Prior art]
Generally, when an asphalt recycled material is used for an asphalt mixture, it is directly heated by a burner.
[0003]
[Problems to be solved by the invention]
It is important that the regenerated heated asphalt mixture is stirred and mixed in a state where the regenerated aggregate is heated to a certain temperature, so that the heat does not adversely affect the properties of the asphalt and moisture is sufficiently removed. Become an element.
[0004]
Conventionally, since it is directly heated by a burner, degradation and properties of asphalt are observed. Moreover, since it was exposed to high temperature by direct heating, there existed problems, such as generating the odor peculiar to asphalt.
[0005]
Accordingly, an object of the present invention is to provide a heating apparatus for an asphalt regenerated material in which no deterioration or property change occurs, and moisture is reliably removed to prevent generation of odor.
[0006]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention provides a transporting material having a heating material heated by a dryer device equipped with a burner device, and a charging port and a discharging port into which a heated material to be recycled aggregate is charged. In the case, a feeding device provided with a spiral body that is transported from the input port to the discharge port along a rotatable rotating shaft is disposed, and a plurality of stirring plates are provided on the rotating shaft, and the stirring plate is stirred. The working surface is parallel to the axis of the rotation axis .
[0007]
As a preferred embodiment, the stirring plate is attached with a predetermined receding angle with respect to a vertical axis perpendicular to the axis of the rotation shaft.
[0008]
Alternatively, the spiral body is attached with a predetermined gap between the rotating shaft and the shaft circumferential surface.
[0009]
According to such a heating device, the heated heating material charged from the charging port and the heated material to be recycled aggregate are heat-exchanged while being sent toward the discharge port by the feeding device, and stirred to a constant temperature. Mixed. During this conveyance, when the heating material and the material to be heated are fed by the helical body, a difference in feeding speed occurs between the clearance area between the rotating shaft and the helical body and the working area of the helical body, and heat exchange occurs due to the difference in feeding speed. Is promoted. At the same time, odor is not generated because heat is applied not by direct heating but by a heating material.
[0010]
Further, by the rotation of the agitating plate, the heating member and the material to be heated is stirred working surface, the center side to the outside, outside the stirring mixture toward the center side, efficient in combination with the feed action by feeder Heat exchange takes place. In addition, moisture accumulated inside can be surely removed.
[0011]
In this case, since the mixture gets over the stirring plate having a receding angle of a predetermined angle, it is possible to repeatedly receive a stirring action during stirring.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be specifically described below with reference to the drawings of FIGS.
[0013]
In FIG. 4, reference numeral 1 denotes an asphalt plant dryer apparatus. In the dryer device 1, a cylindrical drum 3 having a large number of scraping blades (not shown) on an inner peripheral portion thereof is rotatably supported on a machine base 7 by a driving device 5. The drum 3 is inclined downward so that the drum 3 is naturally fed from the inlet 9 side toward the outlet 11 side. A cold hopper 15 having an exhaust flue 13 is fixed to the inlet 9 side, and a hot hopper 17 is fixed to the outlet 11 side. It is provided in the state.
[0014]
The cold hopper 15 communicates with the first hopper 21 via a belt-type conveyor 19 that conveys in the direction of arrow A. A new aggregate serving as a heating material such as sand is introduced into the first hopper 21, and the aggregate is fed into the cold hopper 15 via the conveyor 19 by the feeding device 23.
[0015]
The hot hopper 17 has a burner device 31 that communicates with the charging port 37 of the heat exchanger 25 via a guide rod 29 and generates hot air to be fed into the drum 3 to heat the aggregate.
[0016]
In the heat exchanger 25, a feed device 35 is disposed in the transport case 33 where heat exchange is performed during agitation and mixing of aggregate such as sand as a heating material and recycled asphalt concrete as a material to be heated. The screw conveyor type is shown in FIG.
[0017]
The transfer case 33 has the input port 37 on one side and a discharge port 39 on the other side, and further has an exhaust duct 43 that discharges moisture generated during stirring and mixing by the fan 41.
[0018]
The feeding device 35 includes a rotating shaft 45 and a spiral body 47 that conveys from the inlet 37 to the outlet 39 along the rotating shaft 45.
[0019]
The rotary shaft 45 is supplied with rotational power decelerated by the drive motor 49.
[0020]
In this case, rotational power may be directly applied to the rotary shaft 45 from the drive motor 49 via the speed reduction mechanism 51, or although not shown, a sprocket provided on the rotary shaft 45 and a drive sprocket of the drive motor 49 Alternatively, a conductive chain may be hung around and the rotational power of the drive motor 49 may be transmitted through the conductive chain.
[0021]
The spiral body 47 is attached to the shaft peripheral surface of the rotary shaft 45 with a predetermined gap d by a support bracket 53.
[0022]
Note that a spiral body having no gap d may be provided directly on the rotary shaft 45.
[0023]
A plurality of stirring plates 55 having a stirring action surface 55a substantially parallel to the axis X of the rotating shaft 45 are fixed to the rotating shaft 45 at a predetermined interval.
[0024]
As shown in FIG. 3, the stirring plate 55 is attached with a predetermined receding angle θ with respect to a vertical axis Y perpendicular to the axis X of the rotating shaft 45, and one end edge is shown in FIG. Thus, it is desirable to weld the spiral surface of the spiral body 47. Thereby, the support rigidity of the stirring plate 55 is ensured.
[0025]
In this case, as shown in FIG. 5, the stirring plate 55 is not necessarily welded to the spiral surface of the spiral body 47, and may be disposed at a distant position. Further, the shape does not have to be a single plate shape, and as shown in FIG. 6, it is possible to adopt a structure in which the stirring plate 55 is supported by a mounting member 57 extended from the rotating shaft 45.
[0026]
Further, the stirring plate 55 does not necessarily have the receding angle θ and may be attached along the vertical axis Y as shown by the phantom line in FIG.
[0027]
On the other hand, a second hopper 61 communicates with the insertion port 37 of the transport case 33 via a conveyor 59 that transports in the direction of the arrow C in addition to the guide rod 29 of the hot hopper 17.
[0028]
The second hopper 61 is supplied with asphalt concrete recycled aggregate (hereinafter referred to as recycled aggregate) that has been finely pulverized, and is recycled to the inlet 37 through the conveyor 59 by the delivery device 63. Aggregates are sent in.
[0029]
The discharge port 39 of the heat exchanger 25 communicates with the receiving port 69 of the lifting device 67 that feeds the storage bin 65 above.
[0030]
On the other hand, a second dryer device 71 is provided in parallel with the dryer device 1 described above.
[0031]
In the second dryer device 71, a cylindrical drum 73 having a large number of scraping blades (not shown) on the inner peripheral portion thereof is rotatably supported on a machine base 77 by a driving device 75. The drum 73 is inclined downward so as to be naturally sent from the inlet (right side of the drawing) side toward the outlet (left side of the drawing), a cold hopper 81 having an exhaust flue 79 on the inlet side, and a hot hopper 83 on the outlet side. Are provided in a fixed state.
[0032]
The cold hopper 81 communicates with an aggregate hopper 87 provided in a plurality of rows via a belt type conveyor 85 that conveys in the direction of arrow D. A new aggregate such as sand, gravel, crushed stone, or the like is charged into the aggregate hopper 87, and the aggregate is fed into the cold hopper 81 through the conveyor 85 by the feeding device 89.
[0033]
The hot hopper 83 has a burner device 95 that communicates with the receiving port 93 a of the second lifting device 93 that feeds the aggregate upward through the guide rod 91 and generates hot air and feeds it into the drum 73. Yes.
[0034]
The second lifting / lowering device 93 communicates with the vibration sieve 97 via the upper discharge cylinder 93 b, and the vibration sieve 97 communicates with the aggregate storage bin 99.
[0035]
The vibration sieve 97 functions to screen each aggregate according to the particle size by vibrating the whole. The aggregate storage bin 99 stores each aggregate screened by the vibration sieve 97 for each particle size, and the aggregate in the aggregate storage bin 99 is measured in the aggregate measuring tank 101. After that, it is sent to the mixer 103.
[0036]
The mixer 103 has a pair of stirring blades 105 and 105 inside, and a bottom portion is a pavement material outlet 107.
[0037]
In the mixer 103, new asphalt material from the asphalt measuring tank 109 and stone powder from the stone powder measuring tank 111 are communicated with the second aggregate from the aggregate measuring tank 101 and the storage bin 65. The first aggregates from the measuring tank 113 are respectively charged and stirred.
[0038]
Next, the operation will be described. The heated sand as aggregate is sent from the first hopper 21 into the dryer apparatus 1 and heated to a predetermined temperature, and then sent to the charging port 37 of the heat exchanger 25. At the same time, recycled asphalt aggregate as a recycled aggregate is sent from the second hopper 61 to the input port 37 and sent out to the discharge port 39 while being agitated and mixed. In this conveying step, heat exchange is performed, and the asphalt recycled aggregate is heated from the heated sand and is raised to a predetermined temperature.
[0039]
In this case, when the asphalt recycled aggregate and the heated sand are subjected to a feeding action by the spiral body 47, a difference in the feeding action occurs between the gap d region between the rotating shaft 45 and the spiral body 47 and the acting area of the spiral body 47. The heat exchange is promoted by the difference in feeding speed, and heat is rapidly applied to a predetermined temperature. And since it is not a direct heating, generation | occurrence | production of an odor is also suppressed small. At the same time, the regenerated aggregate and the heated sand by the rotation of the stirring plate 55 are stirred and mixed by the stirring action surface 55a to the outside on the center side and to the center side on the outside. As a result, the moisture accumulated in the interior is discharged to the outside through the exhaust duct 43 while making a large amount of contact with air during stirring and mixing. As a result, the asphalt recycled aggregate does not deteriorate or change its properties under the influence of heat. And since water | moisture content is fully removed, the temperature does not drop rapidly at the time of construction, and the stable pavement surface is obtained over a long period of time.
[0040]
Moreover, since the mixture gets over the stirring plate 55 having the receding angle θ during the stirring, the stirring time becomes longer and the stirring is repeated.
[0041]
Next, the first aggregate stirred and mixed at a constant temperature from the discharge port 39 is fed upward by the lifting device 67 and temporarily stored in the storage bin 65.
[0042]
On the other hand, the aggregate heated by the second dryer device 73 is fed upward by the second lifting / lowering device 93, sieved to each particle size by the vibration sieve 97, and then fed to the aggregate storage bin 99. It is.
[0043]
The first aggregate with heat in the storage bin 65 and the second aggregate with heat in the aggregate storage bin 99 are measured by the measuring tanks 101 and 113 and fed into the mixer 103. . At the same time, the stone powder and the new asphalt material are fed into the mixer 103 from the stone powder metering sieve 111 and the asphalt metering tank 109, stirred in the mixer 103, and can be taken out from the paving material outlet 107 as an asphalt paving material at a predetermined temperature. .
[0044]
In addition, although the heating apparatus of this embodiment is an example implemented to an asphalt plant, it is not specified to an asphalt plant.
[0045]
【The invention's effect】
As described above, according to the heating apparatus for asphalt recycled material of the present invention, the material to be heated that becomes the recycled aggregate is conveyed while being stirred and mixed together with the heated heating material, thereby performing heat exchange. is heat given up quickly and efficiently a predetermined temperature. And since it is not exposed to high temperature by direct heating, it can prevent reliably that it deteriorates or a property changes with the influence of a heat | fever, and can suppress generation | occurrence | production of an odor. Moreover, it is aerated by the stirring and mixing in the direction perpendicular to the axial center by the stirring plate, and the internal moisture can be efficiently removed.
[Brief description of the drawings]
FIG. 1 is a schematic cut-away view of a heat exchanger according to the present invention.
FIG. 2 is a partial explanatory view showing a state in which a stirring plate is welded to a spiral body.
FIG. 3 is a cross-sectional enlarged explanatory view taken along line AA in FIG. 1;
FIG. 4 is a schematic explanatory diagram of the entire heat exchanger implemented in an asphalt plant.
FIG. 5 is a partial explanatory view showing a modified example of the mounting position of the stirring plate.
FIG. 6 is an explanatory view of a part in which a stirring plate is attached to a rotating shaft via an attachment member.
[Explanation of symbols]
23 Carrying case 35 Feeder 37 Input port 39 Discharge port 45 Rotating shaft 47 Spiral member 55 Stirring plate 55a Stirring action surface X Axis

Claims (3)

A heating case heated by a dryer device equipped with a burner device and a feed case into which a heated material to be recycled aggregate is put together and a discharge case along a rotatable rotating shaft A feeding device provided with a spiral body that conveys from the charging port to the discharging port is arranged, a plurality of stirring plates are provided on the rotating shaft, and the stirring action surface of the stirring plate is parallel to the axis of the rotating shaft heating apparatus asphalt recycled material, characterized in that there. 2. The heating apparatus for asphalt reclaimed material according to claim 1, wherein the stirring plate is attached with a predetermined receding angle with respect to a vertical axis perpendicular to the axis of the rotating shaft. 2. The heating apparatus for asphalt reclaimed material according to claim 1, wherein the spiral body is attached with a predetermined gap between the spiral shaft and a peripheral surface of the rotating shaft.

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