WO2011036910A1

WO2011036910A1 - Aggregate heating apparatus and aggregate heating method

Info

Publication number: WO2011036910A1
Application number: PCT/JP2010/056462
Authority: WO
Inventors: 一三山城
Original assignee: 特定非営利活動法人プロサップ; 南部鋪道株式会社; 琉興総業株式会社
Priority date: 2009-09-25
Filing date: 2010-04-09
Publication date: 2011-03-31
Also published as: WO2011036773A1

Abstract

Disclosed is an aggregate heating apparatus (20) equipped with a heating furnace unit (54) that heats aggregate (12) by means of a microwave-based heating method, a heat-retention furnace unit (52) that retains the heat of the heated aggregate by means of an electrical or optical heating method, and a microwave supply unit (62) that supplies microwaves within the heating furnace unit. The heat-retention furnace unit and the heating furnace unit vertically form a multi-step structure in that order. A first aggregate discharge section (64), which is capable of opening and closing and is for discharging the aggregate to a lower step, is disposed on partition sections that partition each step of the of the multi-step structure; and a second aggregate discharge section (82), which is capable of opening and closing and is for discharging the aggregate that had heat retained in the heat-retention furnace unit, is disposed on the bottom of the heat-retention furnace unit.

Description

Aggregate heating device and aggregate heating method

The present invention relates to an aggregate heating apparatus and an aggregate heating method, and more particularly to an aggregate heating apparatus and a heating method for composing asphalt composite material.

When manufacturing asphalt mixture for use in the asphalt pavement site, moisture adhering to aggregates such as crushed stone and sand of various sizes, which is the composition of the asphalt mixture, is dried and mixed into the asphalt mixture. It is necessary to keep the asphalt softened while transporting the asphalt mixture to the pavement site. Therefore, an asphalt plant that manufactures an asphalt mixture includes an aggregate heating device that heats the aggregate to a desired temperature. As this aggregate heating device, there is one using a heating burner of a dryer for heating and drying as in Patent Document 1. In patent document 1, the aggregate is heated using the hot air by the heating burner of the dryer for heat drying, and the radiant heat from the inner cylinder which covers the flame. As an aggregate heating device, as described in Patent Document 2, a heating method using a high frequency electromagnetic wave is also known. In the technique described in Patent Literature 2, the aggregate is dried by the heating furnace while the aggregate is being conveyed by the conveyance device through the conveyance device that is horizontally disposed in the heating furnace that heats the aggregate by high-frequency electromagnetic waves. .

JP 2006-45845 JP 2006-32254 A

However, in the technique described in Patent Document 1, since heated air heated by liquid fuel such as heavy oil or gaseous fuel such as gas is blown onto the aggregate, the exhaust gas discharged when these fuels are burned is heated. The surrounding environment will be destroyed by smoke, odor, CO _2, etc. Moreover, when using liquid fuel, such as a heavy oil boiler, as a heat source of a heating hot air, there exists a possibility of contaminating soil by the outflow of liquid fuel.

In the technique described in Patent Document 2, it is necessary to secure a moving port of the transfer device in the heating furnace, which is considered to include a problem of environmental destruction due to leakage of radio waves.

An object of the present invention is to provide an aggregate heating apparatus and an aggregate heating method capable of more reliably reducing the load on the environment.

The aggregate heating device according to the present invention comprises at least one heating furnace part for heating the aggregate constituting the asphalt mixture by a heating method based on microwaves, and the aggregate heated in at least one heating furnace part, A heat-retaining furnace section that retains heat by an electrical or optical heating method, and a microwave supply section that supplies microwaves into the heating furnace section. The heat-retaining furnace section and the heating furnace section are provided in this order in the vertical direction. The multi-stage structure is configured, and the partition part separating each stage constituting the multi-stage structure is provided with a first aggregate discharge part that can be opened and closed and discharges the aggregate to the lower stage. A second aggregate discharging unit that is openable and closable and that discharges the aggregate that has been kept warm in the heat insulating furnace is provided at the bottom of the heat insulating furnace.

In this structure, the heating furnace part located above the heat insulation furnace part can heat the aggregate based on the microwave supplied from the microwave supply part. Furthermore, in the heat insulation furnace, the aggregate is kept warm by an electric or optical heating method. As described above, microwaves are used for heating the aggregate by the heating furnace, and electrical or optical heating methods are used for heating by the heat holding furnace, so that CO ₂ or the like is not discharged. . Furthermore, the heat-retaining furnace part and the heating furnace part are arranged in the vertical direction to form a multistage structure. Therefore, leakage of microwaves used for heating the aggregate in the heating furnace can be suppressed. Further, in the multi-stage structure, since the first aggregate discharge portion that can be opened and closed is provided in the partition wall that partitions each step, the lower step portion that is adjacent to the upper step portion by opening the first aggregate discharge portion Aggregate can be thrown into. As a result, the aggregate heated in the heating furnace can be easily put into the heat insulation furnace. Moreover, since the 2nd aggregate discharge part which can be opened and closed is provided in the bottom part of the heat retention furnace part, aggregate can be discharged by opening the 2nd aggregate discharge part. Therefore, for example, it is not necessary to pass the conveying means for conveying the aggregate such as a conveyor through the aggregate heating device. Moreover, it can be set as the structure which closed the aggregate heating apparatus by closing the 1st and 2nd aggregate discharge part. Therefore, the load on the environment due to the microwave can also be reduced. Furthermore, in the said structure, since the next aggregate can be heated in a heating furnace part, keeping an aggregate in a heat retention furnace part, it is possible to heat-process an aggregate continuously.

Moreover, in the aggregate heating apparatus according to the present invention, it is preferable that a plurality of the heating furnace parts are provided in multiple stages on the heat insulating furnace part.

In this configuration, the aggregate can be heated in stages in a plurality of heating furnace sections and sequentially supplied to the lower heating furnace section, so that the processing capacity of the aggregate heating apparatus can be improved.

In the aggregate heating apparatus according to the present invention, it is preferable to further include a microwave absorber provided in the heating furnace.

In this case, the aggregate can be heated not only by the direct heating of the aggregate by the microwave but also by the heat generated by the microwave absorber absorbing the microwave.

In the aggregate heating apparatus according to the present invention, the heating furnace unit further includes a stirring unit that stirs the aggregate, and the stirring unit includes a rotating shaft and a plurality of stirring blades provided on the rotating shaft. It is characterized by.

Agitation of the aggregate makes it easier to irradiate the aggregate with microwaves, so that the aggregate can be efficiently heated.

Further, the aggregate heating method according to the present invention is a method of heating asphalt mixture by a heating method based on microwaves in a heating furnace part that is positioned on the heat insulating furnace part in the vertical direction and constitutes a multistage structure together with the heat insulating furnace part. A heating step of heating the aggregate to be composed; and a first aggregate discharge unit provided at the bottom of the heating furnace unit that is openable and closable to discharge the aggregate to an adjacent lower stage of the multistage structure. Provided at the bottom of the heat insulation furnace, the aggregate discharge process, the heat insulation process in which the aggregate heated in the multistage structure at the upper stage adjacent to the heat insulation furnace is electrically or optically heated. A second aggregate discharging step of opening the second aggregate discharging section that is openable and closable and discharging the aggregate to the outside of the heat insulation furnace section.

In this method, in the heating furnace part located above the heat insulation furnace part, the aggregate in the heating furnace part is heated using microwaves, and in the heat insulation furnace part, the aggregate is kept warm by an electrical or optical heating method. To do. As described above, microwaves are used for heating the aggregate by the heating furnace, and electrical or optical heating methods are used for heating by the heat holding furnace, so that CO ₂ or the like is not discharged. . Furthermore, since the heat-retaining furnace part and the heating furnace part are arranged in the vertical direction, the aggregate can be moved from the upper stage part to the lower stage part in the first aggregate discharging process, and the second aggregate discharging process. The aggregate can be discharged to the outside of the heat insulation furnace. Therefore, the movement of the aggregate from the heating furnace part to the heat insulation furnace part and the discharge of the aggregate to the outside are facilitated. Therefore, for example, it is not necessary to pass a conveying means for conveying the aggregate such as a conveyor through the aggregate heating apparatus. Moreover, since the said multistage structure can be made into the closed structure by closing the 1st and 2nd aggregate discharge part, the leakage of the microwave utilized in a heating furnace part can be suppressed. Therefore, the load on the environment due to the microwave can also be reduced. Furthermore, in the above method, since the next aggregate can be heated in the heating furnace while keeping the aggregate in the heat retaining furnace, it is possible to continuously heat the aggregate.

Further, in the aggregate heating method according to the present invention, a plurality of heating furnace parts are provided in multiple stages in the vertical direction, and the heat insulation furnace part is the lowest heating furnace among the plurality of heating furnace parts provided in multiple stages. In the heating step, the aggregate is preferably heated in order from the uppermost stage in a plurality of heating furnaces provided in multiple stages.

In this method, the aggregate can be heated step by step in a plurality of heating furnace sections, and the aggregate can be sequentially supplied to the lower heating furnace section, so that the heat treatment capacity of the aggregate can be improved.

In the aggregate heating method according to the present invention, in the heating step, it is preferable to heat the aggregate while stirring it with a stirring unit. In the heating step, the aggregate is agitated by the agitation unit, so that the microwave is easily irradiated to the aggregate. Therefore, the aggregate can be heated more efficiently.

According to the present invention, the aggregate can be heated more reliably while preventing environmental destruction.

It is a mimetic diagram of one embodiment of an asphalt compound material manufacturing system containing one embodiment of an aggregate heating device concerning the present invention. It is an end view which shows roughly the structure of one Embodiment of the aggregate heating apparatus which concerns on this invention. It is a block diagram for demonstrating an example of the control mechanism of the aggregate heating apparatus shown in FIG. It is sectional drawing which shows roughly an example of other embodiment of the heating furnace part which the aggregate heating apparatus which concerns on this invention has. FIG. 5 is a cross-sectional view schematically showing an example of a cross-sectional configuration orthogonal to the axis of the rotation axis of the stirring unit shown in FIG. 4.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the following description, the same reference numerals are used for the same elements, and duplicate descriptions are omitted.

FIG. 1 is a schematic view of an embodiment of an asphalt composite material production system including an embodiment of an aggregate heating device according to the present invention.

The asphalt mixture manufacturing system 10 is a system for manufacturing the asphalt mixture 14 using the aggregate 12. In the asphalt composite material manufacturing system 10, as the aggregate 12 constituting the asphalt composite material 14, a new aggregate 12A such as new crushed stone or new sand and a recycled aggregate 12B such as oxidized slag are used. The recycled aggregate 12B is mixed with the aggregate 12A at a predetermined ratio.

The asphalt composite material manufacturing system 10 includes a plurality of cold bins 16A for collecting, for each size, a new aggregate 12A taken out from an aggregate silo that stocks aggregates such as crushed stone and sand in various sizes. . A first aggregate conveying means 18A is provided below each cold bin 16A. An example of the first aggregate conveying means 18A is a conveyor. An example of the conveyor is a belt conveyor. The first aggregate conveying means 18A conveys a certain amount of aggregate A discharged from each cold bin 16A to the aggregate heating device 20A.

The aggregate heating device 20A heats the supplied aggregate 12A to remove adhering moisture and dry it, and heats it to a desired temperature. A second aggregate conveying means 18B is provided below the aggregate heating apparatus 20A. An example of the second aggregate conveying means 22B is a conveyor. An example of this conveyor is a chain conveyor. The second aggregate conveying means 22B conveys the heated aggregate 12A discharged from the aggregate heating device 20A to the hot elevator 24. The hot elevator 24 puts the aggregate 12 A into the hot bin 26. The hot bottle 26 includes a crushed stone screen 26a having a mesh according to the size of each aggregate 12A, and an accommodating portion 26b that accommodates the aggregate 12A having different sizes selected according to the size of the mesh of each crushed stone screen 26a. The aggregate 12A is sorted by size and stored for each size.

A weighing facility 28 is provided at the subsequent stage of the hot bin 26. The weighing equipment 28 measures the aggregates 12A having different sizes selected by the hot bins 26 in accordance with the aggregate blending amount of the asphalt mixture 14 to be manufactured, and then supplies the aggregate 12A into the mixing equipment 30.

The asphalt composite material manufacturing system 10 also includes a cold bin 16B for storing the recycled aggregate 12B. Below the cold bin 16B, a first aggregate conveying means 18B similar to the first aggregate conveying means 18A is provided. The first aggregate transport means 18B transports the aggregate 12B discharged from the cold bin 16B storing the aggregate 12B to the aggregate heating device 20B. The aggregate heating device 20B heats the aggregate 12B to a desired temperature. The heated aggregate 12B is put into the skip trolley 34A via the second aggregate conveying means 22B and the recycled aggregate sieving machine 32 similar to the second aggregate conveying means 22A. The skip trolley 34 A conveys the aggregate 12 B to the surge bin 36. Aggregate 12B discharged from surge bin 36 is weighed by a predetermined amount by skip trolley 34B having a metering function, and a predetermined amount of aggregate 12B is supplied into mixing facility 30.

In addition to the above-described

aggregates

12A and 12B, the mixing equipment 30 is supplied with a predetermined amount of stone powder supplied from the stone powder silo 38 and measured by the stone powder measuring tank 40, and supplied from the asphalt tank 42 and measured by the asphalt measuring tank 44. Then, molten asphalt heated to a desired temperature is charged. The

aggregates

12A and 12B, the stone powder, and the molten asphalt that have been charged are agitated and mixed by the rotating stirring blade 30a to become the asphalt mixture 14.

The asphalt mixture 14 manufactured by the asphalt mixture manufacturing system 10 can be mounted on a transportation means 46 such as a truck and directly supplied to the pavement site. However, the asphalt mixture manufacturing system 10 can also include a storage silo 48 that stores the manufactured asphalt mixture 14. In this case, the manufactured asphalt mixture 14 is carried into the mixture storage silo 48 from the mixing facility 30 via the skip trolley 34C, and can be supplied to the pavement site as needed by the mixture storage silo 48. Stocked. The asphalt mixture 14 stocked in the mixture storage silo 48 is appropriately mounted on a transport means 46 such as a truck and supplied to the pavement site.

In the asphalt mixture manufacturing system 10, depending on the desired production amount of the asphalt mixture 14, for example, the discharge amount of the

aggregates

12 A and 12 B from the

cold bins

16 A and 16 B and the

aggregate heating devices

20 A and 20 B and the first and Changes in the conveying speed of the

aggregates

12A and 12B by the second aggregate conveying means 18A, 18B, 22A and 22B occur. Therefore, the asphalt composite material manufacturing system 10, for example, in accordance with the desired production amount of the asphalt composite material 14, the aggregate discharge amount from each device, the aggregate of the aggregate by the first and second aggregate conveying means, etc. It is preferable to control the conveyance speed and the like. In FIG. 1, for convenience of illustration, the control device 50 is connected to the cold bin 16 A, the aggregate heating device 20 A, the first and second aggregate transport means 18 A, 22 A by a control line (dashed line in the figure). The connection is illustrated, and the description of the control lines to the devices on the subsequent stage of the second aggregate conveying means 22B and the devices on the side of the recycled aggregate 12B is omitted.

Next, the aggregate heating apparatus according to this embodiment that is preferably applied to the asphalt composite material manufacturing system 10 will be described in detail with reference to FIGS. 2 and 3. In the following description, unless otherwise specified, the new aggregate 12A and the regenerated aggregate 12B are referred to as the aggregate 12, and the aggregate heating device 20A and the aggregate heating device 20B are referred to as the aggregate heating device 20.

FIG. 2 is an end view schematically showing a configuration of an embodiment of the aggregate heating apparatus. FIG. 3 is a block diagram for explaining an example of the control mechanism of the aggregate heating device. In FIG. 3, some of the elements related to the aggregate heating device 20 and the control are schematically shown.

As shown in FIG. 2, the aggregate heating device 20 has a multistage structure in which a heat retaining furnace part 52, a heating furnace part 54, and a heating furnace part 54 are provided in series in order from the lower side in the vertical direction. A hopper portion (lid portion) 56 is further provided on the uppermost heating furnace portion 54. In the following description, for convenience of description, when describing to distinguish two furnace portions 54, the heating furnace 54 adjacent to the thermal insulation furnace section 52 referred to as a furnace section 54 _1, adjacent to the hopper 56 the furnace 54 is also referred to as a furnace section 54 _2. The same applies to the constituent elements of each heating furnace section 54.

Each furnace section 54 _1, 54 ₂ included in the aggregate heating device 20 heats the aggregate 12 by a heating method using a microwave. Moreover, the heat insulation furnace part 52 heats the aggregate 12 by electric heating. As described above, the aggregate heating device 20 is a hybrid aggregate heating device in which the heating method and the heat retaining method of the aggregate 12 are different between the

heating furnace portions

54 ₁ and 54 ₂ and the heat retaining furnace portion 52. The structure of each step part which comprises the aggregate heating apparatus 20 of a multistage structure is demonstrated.

The structure of the heating furnace part 54 _m (m is 1 or 2) of the aggregate heating device 20 will be described. The heating furnace portion 54 _m has a cylindrical side wall 58 _m and a bottom wall 60 _m made of a metal material (microwave shield material) having a microwave shielding characteristic such as iron or stainless steel. The side wall 58 _m can have a substantially rectangular shape when viewed from the input side of the aggregate 12 (upper side in the figure). On the inner surface of the side wall 58 _m , there is provided a microwave supply unit 62 _m for irradiating microwaves into the heating furnace unit 54 _m .

The microwave supply unit 62 _m can be, for example, a microwave oscillator of 2.450 MHz assigned to industrial, chemical, medical, and other uses in the radio wave law. However, the microwave supply unit 62 _m may include a propagation member such as an electromagnetic wave waveguide or a horn antenna that is attached to the microwave transmitter and propagates the microwave. When the microwave supply unit 62 _m is configured by attaching a propagation member such as an electromagnetic wave waveguide or a horn antenna to the microwave oscillator, for example, the microwave oscillator is extended to the outer wall surface side of the side wall 58 _m , It can also be adapted to supply microwaves into the heating furnace section 54 _m through the propagation member.

The bottom wall 60 _m, the opening 64a _m for discharging the aggregate 12 that is heated in a heating furnace part 54 _m is formed. Opening 64a _m can be assumed to extend in a predetermined direction. The openings 64a _m is openable closing portion 64b _m is provided in the opening 64a _m. In this case, when the closing part 64b _m is opened, the aggregate 12 is discharged to the lower portion through the opening 64a _m. Thus, openings 64a _m and the opening and closing portion 64b _m is the heated aggregate 12 open aggregate discharge portion for discharging the lower portion (first aggregate discharge portion) constitutes a 64 _m . The opening / closing part 64b _m is preferably made of a microwave shielding material such as iron or stainless steel. When closing the closing portion 64b _m, it is because it inhibited more reliably microwave leakage.

An example of the opening / closing portion 64b _m is a pair of plate-like bodies as shown in FIG. Plate-like body as these closing portion 64b _m, along with crosses capable relative to each other, it is sufficient to provided adjustably bottom wall 60 _m the amount of projection of the opening 64a _m side. In this configuration, it is possible to control the opening and closing of the closing part 64b _m by controlling the opening and closing control unit 66 m _(see FIG. 3) the amount of projection of the opening 64a _m side of the pair of the plate-like body. Further, the opening and closing portion 64b _m can also be arranged plate-like body so as to cover the end portion of the opening 64a _m. In this case, the switching control section 66 _m by moving the plate-shaped body from an end portion of the opening 64a _m, can control the opening and closing. However, the opening and closing portion 64b _m is not particularly limited as long as it is open constituting the opening 64a _m.

Switching control section 66 _m is, for example, a cylinder, in this case, controls the opening and closing of the opening and closing unit by adjusting the expansion and contraction of the cylinder. Examples of the cylinder include an air cylinder and a hydraulic cylinder. Switching control section 66 _m is connected to the closing part 64b _m may be arranged to open and close portion 64b _m drivable position, for example, heating the container portion 68 _m and the side walls 58 _m and a bottom wall 62 _m, which will be described later It can also be provided in a space formed between them.

Inside the heating furnace portion 54 _m , a heating container portion 68 _m that houses the aggregate 12 during heating is provided. Heating the container portion 68 _m has a tapered portion 68a _m was tapered lower tapered portion 68a _m first and second cylindrical portions _68b m respectively from both ends of the 68c _m extends. First and second cylindrical portion 68b _m, can be a substantially square shape in cross section shape perpendicular to the vertical direction of 68c _m. The second tubular portion 68c _m is communicated with the opening 64a _m of the bottom wall 60 _m.

In Figure 2, the angle is set to approximately equal with respect to the vertical direction of the pair of inclined surfaces constituting the tapered portion 68a _m, it may be different. In this case, there is a tendency for flowing into the aggregate 12 to the second cylindrical portion 68c _m becomes easier.

As the material of the heating vessel portion 68 _m, it is not particularly limited as long as it has a microwave transparent, for example, heat-resistant glass and brick, refractory tiles and refractory ceramic plate or the like insulation material is preferred. This is because it is easy to confine heat in the heating container portion 68 _m . On the inner surface of the heating container portion 68 _m is the microwave absorber 70 _m to absorb the microwave is provided in a layer or particles dispersed form. Examples of the microwave absorber 70 _m include iron oxide, magnetic material, silicon carbide, carbon material, permalloy, and the like. Although exemplified insulation Suitable materials for heating the container portion 68 _m, the material of the heating vessel portion 68 _m as described above may have a microwave transparent. Further, although the microwave absorber 70 _m is provided in the form of a layer or a particle dispersion on the inner surface of the heating container portion 68 _m , it is not limited thereto. Microwave absorber 70 _m, for example, may be dispersed in the wall constituting the heating vessel portion 68 _m, heating the container portion 68 _m is formed from a microwave transparent material having no heat insulating properties In some cases, it may be provided on the outer surface.

Two heating furnace section ₅₄ 1, 54 ₂ of the above-described configuration, since provided in series in the vertical direction, the bottom wall 60 ₂ of the furnace section 54 ₂ is a heating furnace unit 54 ₁ and the heating furnace 54 ₂ It becomes the partition part which partitions off. Thereby, the aggregate 12 can be heated effectively. Further, in the above arrangement, the interior space of the heating furnace unit _542, so surrounded by walls made of microwave shielding material, the interior space of the heating furnace unit ₅₄₂ has a microwave shield space. The heating container 68 ₁ heating container portion 68 ₁ has is arranged in a position to be received aggregate 12 discharged from the opening 64a ₂ of the heating furnace 54 _2.

On two heating furnace section 54 _1, 54 heating furnace 54 ₂ of the upper portion of the _2, it is a hopper portion 56 and a microwave shielding material is disposed, such as iron, stainless steel or the like described above Yes. The bottom surface of the hopper 56 serves as the upper surface of the heating furnace 54 _2. Therefore, it is effective to allow heating the aggregate 12 in the heating furnace 54 _2. Further, in the above configuration, the inner space of the furnace section 54 _2, it means surrounded by walls made of microwave shielding material, the interior space of the heating furnace unit ₅₄₂ has a microwave shield space.

Hopper 56 is for turning on the aggregate 12 that has been conveyed by the first aggregate conveying means 18 into the heating furnace 54 _2. The opening 72a of the hopper 56 is provided with an opening / closing portion 72b that can open and close the opening 72a. In this case, when the opening / closing part 72b is opened, the aggregate 12 is put into the lower stage part through the opening part 72a. Therefore, the opening 72a and the opening / closing part 72b constitute an aggregate input part 72 that can be opened and closed for inputting the aggregate 12 to the lower stage part. Configuration of the closing part 72b can be similar to opening portion 64b _1, the material of the closing part 72b can also be assumed similar to the closing part 64b _1. The opening / closing part 72b can be controlled to open / close by an opening / closing control part 74 (see FIG. 3). Switching control section 74 may be configured similarly to the switching control section 66 _m, for example, a cylinder such as an air cylinder or a hydraulic cylinder. The opening / closing control unit 74 may be connected to the opening / closing unit 72b and disposed at a position where the opening / closing unit 72b can be driven. For example, the opening / closing control unit 74 forms an accommodation space for accommodating the opening / closing control unit 74 between the slope portion and the bottom wall surface of the hopper 56, and may be arranged inside or outside thereof. it can.

Further, the two furnace portions 54 _1, 54 lower bottom of the furnace section 54 ₁ of _2, kept furnace section 52 is disposed. The heat insulation furnace 52 is a furnace for keeping the aggregate 12 at a predetermined temperature by an electric heating method. Thermal insulation furnace section 52 includes a sidewall 76 and a bottom wall 78 made of the same shape and material as the side walls 58 ₁ and a bottom wall 60 ₁ with a heating furnace unit 54 _1. A heating element 80 is provided on the side wall 76. The heating element 80 can be a metal heating element such as a nichrome wire, a Kanthal wire, or a platinum wire.

The bottom wall 78 is formed with an opening 82 a for discharging the aggregate 12 that has been kept warm by the heat-retaining furnace 52. The opening 82a is provided with an opening / closing part 82b that can open and close the opening 82a. In this case, the aggregate 12 is discharged from the heat insulating furnace 52 when the opening / closing part 82b is opened. Accordingly, the opening 82a and the opening / closing part 82b constitute an openable / closable aggregate discharging part 82 for discharging the heated aggregate 12. Configuration of the closing part 82b can be similar to opening portion 64b _1, the material of the closing part 82b can also be assumed similar to the closing part 64b _1. The opening / closing part 82 b can be controlled to open / close by the opening / closing control part 84. The switching control section 84 may be configured similarly to the switching control section 66 _m, for example, a cylinder such as an air cylinder or a hydraulic cylinder. The opening / closing controller 84 may be connected to the opening / closing part 82b and disposed at a position where the opening / closing part 82b can be driven. For example, the open / close control unit 84 can be provided in a space formed between a heat retaining container 86 and a side wall 76 and a bottom wall 78, which will be described later.

Inside the heat insulation furnace 52, a heat insulation container portion 86 for housing the aggregate 12 during heat insulation is provided. Insulated container portion 86, similarly to the heating container portion 68 _m, has a tapered portion 86a which is tapered downward, the first and second cylindrical portions 86b, respectively from both ends of the tapered portion 86a, is 86c extends ing. The second cylindrical portion 86 c communicates with the opening 82 a of the bottom wall 78.

Incidentally, it is preferable that an angle relative to the vertical direction of the pair of inclined surfaces constituting the tapered portion 86a are different, the same as in the heating furnace part 54 _m. The material constituting the heat retaining container 86 is a material having heat conductivity, for example, a ceramic material made of aluminum, iron, nitride, or boride.

On insulation furnace 52, furnace 54 ₁ so positioned, the bottom wall 60 ₁ of the furnace section 54 ₁ functions as a partition wall portion which partitions the heating furnace section 54 ₁ and the heat insulating furnace section 52. Therefore, the aggregate 12 can be effectively kept warm in the heat retaining furnace 52. Moreover, in the said structure, since the internal space of the heat retention furnace part 52 is enclosed by the wall surface which consists of a microwave shielding material, the internal space of the heat insulation furnace part 52 is a microwave shield space.

In the aggregate heating device 20, insulated container 86, the heating vessel 68 _1, heating the container portion 68 _2, respectively opening 64a _1, opening 64a _2, a position for receiving the aggregate 12 from the opening 72a Has been placed.

Aggregate heating device 20 heats the aggregate 12 in the heating furnace 54 _1, 54 ₂ (heating step), heated aggregate 12 is discharged to the lower portion (first aggregate discharge step). Further, in the heat insulation furnace 52, the aggregate 12 put in from the upper stage is kept warm (a heat retention step), and the aggregate 12 is appropriately discharged to the outside (second aggregate discharge step).

At this time, in order to heat and insulation aggregate 12 at a suitable predetermined temperature in the heating furnace ₅₄ 1, 54 ₂ and inner heat insulation furnace section 52, the heating furnace ₅₄ 1, 54 ₂ and kept furnace portion 52 Inside, temperature sensors 88 ₁ , 88 ₂ , 90 (see FIG. 3) are respectively provided. Each temperature sensor ₈₈ 1, ₈₈ 2, 90 is capable of measuring position the temperature of the heating container ₆₈ 1, 68 ₂ and insulated container portion 86. Thermocouples are exemplified as the temperature sensors 88 ₁ , 88 ₂ , 90.

The aggregate heating apparatus 20 includes the measurement results of the temperature sensors 88 ₁ , 88 ₂ , 90 in each of the

heating furnace portions

54 ₁ , 54 ₂ and the heat insulation furnace portion 52, the desired aggregate discharge amount from the heat insulation furnace portion 52, etc. It can be controlled by the control device 50 according to the various parameters. As described above, the control device 50 controls the asphalt mixture manufacturing system 10 including the aggregate heating device 20. However, an example of the control mechanism of the aggregate heating device 20 according to the present embodiment in the control device 50 will be described with reference to FIG.

As illustrated in FIG. 3, the microwave supply units 62 ₁ and 62 ₂ , the temperature sensors 88 ₁ and 88 _2, and the open / close control units 66 ₁ and 66 ₂ included in the

heating furnace units

54 ₁ and 54 ₂ are provided in the control device 50. Electrically connected. Similarly, the heating element 80, the temperature sensor 90, and the open / close control unit 84 included in the heat insulation furnace unit 52 are electrically connected to the control device 50. Similarly, an opening / closing control unit 74 that controls opening / closing of the opening / closing unit 72 b provided in the hopper unit 56 is also electrically connected to the control device 50.

The control device 50 controls the open / close control unit 84 so that a predetermined amount of the aggregate 12 is accommodated in the heat insulation furnace 52 based on the discharge amount of the desired aggregate 12 to be discharged from the heat insulation furnace 52. To control the aggregate discharging part. Similarly, the control unit 50, a heating furnace unit ₅₄ 1, 54 as aggregate 12 of a predetermined amount is housed in _2, the switching control unit ₆₆ 1, ₆₆ 2, 74 aggregate discharge portion 64 via the _1, 64 ₂ and to control the aggregate feeding section 72. Further, the control unit 50, the heating vessel ₆₈ 1 of the furnace section ₅₄ 1, 54 _2, 68 ₂ so that each becomes a predetermined temperature, the micro on the basis of the temperature sensor ₈₈ 1, 88 ₂ of the temperature measurement result The amount of microwave irradiation by the wave supply units 62 ₁ and 62 ₂ is controlled. Similarly, the heat generation amount of the heating element 80 is controlled based on the measurement result of the temperature sensor 90 so that the inside of the heat insulation container portion 86 of the heat insulation furnace portion 52 becomes a predetermined temperature.

Note that, in the control device 50, the amount of the aggregate 12 input to the aggregate heating device 20 is normally determined with respect to the amount of the aggregate 12 discharged from the heat insulation furnace 52. In addition to being controlled by the opening / closing control unit 74 of the hopper 56, it is also preferable to control the feeding amount by controlling the conveying speed of the first aggregate conveying means 18 (see FIGS. 1 and 2). Further, since the amount of the aggregate 12 input to the aggregate heating device 20 is determined according to the amount of the aggregate 12 discharged, the microwaves supplied by the microwave supply units 62 ₁ and 62 ₂ according to the amount of the aggregate 12 discharged. It is also preferable to control the amount of wave irradiation and the amount of heat generated by the heating element 80. For example, when processing the aggregate 12 more, it is preferable to increase the microwave irradiation amount and increase the heat generation amount of the heating element 80.

Hereinafter, an example of a method for heating the aggregate 12 using the aggregate heating apparatus 20 will be described. Here, the description will be made by paying attention to the aggregate 12 that is newly input into the aggregate heating apparatus 20 that has already been driven.

Open the aggregate loading portion 72 of the hopper 56, to introduce the aggregate 12 having been conveyed by the first aggregate conveying means 18 (see FIGS. 1 and 2) in the furnace section 54 _2. Since the heating furnace 54 in ₂ it is supplying microwaves from the microwave supply unit 62 ₂ generates heat aggregate 12 absorbs the microwave. Also, the heating furnace 54 in ₂ since the microwave absorber 70 ₂ is provided, the microwave absorber 70 ₂ generates heat by absorbing microwaves. The aggregate 12 is heated by this heat. Thus, in the heating furnace unit _542, by a heating method based on microwave, heating the aggregate 12 directly and indirectly. By a certain time heating the aggregate 12 in the heating furnace 54 inside _2, after heating the aggregate 12 to a first predetermined temperature, open the aggregate discharge unit 64 _2, the furnace section of the aggregate 12 discharged from the 54 _2, charged into the furnace section 54 _1.

Since the heating furnace 54 within ₁ microwave is supplied from the microwave supply unit 62 _1, similar to the heating furnace unit _542, by a heating method based on microwave, heating the aggregate 12. The aggregate 12 in the heating furnace 54 within ₁ to heat a certain time, after heating the aggregate 12 to a higher than the first predetermined temperature a second predetermined temperature, open the aggregate discharge unit 64 _1, discharging the aggregate 12 from the furnace unit 64 _1, to introduce extra insulation furnace section 52.

It said first and second predetermined temperature and the required heating time may be appropriately set depending on the amount and type of the aggregate 12 of the furnace section 54 _1, 54 _2. Microwave oscillation output from the microwave supply unit ₆₂ 1, 62 _2,

first heating furnace

₅₄ 1, 54 ₂ or the furnace section _54, 54 _second heating container portion ₆₈ 1 has, 68 ₂ of the capacitance, the request What is necessary is just to set suitably by the heating time of the aggregate 12 to be performed, the quantity of the aggregate 12 supplied, etc. The temperature of the heating furnace ₅₄ 1, 54 in ₂ controls the microwave supply unit ₆₂ 1, 62 ₂ based on the temperature sensor ₈₈ 1, 88 ₂ of the detection result, to keep constant.

In the heat insulation furnace part 52, by supplying electric power to the heating element 80, the heat insulation furnace part 52 is kept at a predetermined temperature and the aggregate 12 is kept warm. It is preferable that the predetermined temperature in the heat insulation furnace 52 is a second predetermined temperature. The electric power supplied to the heating element 80 may be appropriately set depending on the capacity of the heat insulation furnace 52 or the heat insulation container 86, the required heat retention time of the aggregate 12, the amount of the aggregate 12 to be supplied, and the like. Further, the temperature in the heat insulation furnace 52 is controlled to be constant by controlling the power supplied to the heating element 80 based on the detection result of the temperature sensor 90. The aggregate 12 stored while being kept warm in the heat retaining furnace 52 is discharged by a desired amount by controlling the opening / closing of the aggregate discharging section 82. The discharged aggregate 12 is carried out by the second aggregate transport means 22.

In the description of the heating method described above, the aggregate heating device 20 has already been driven. However, in the initial drive, the microwave supply units 62 ₁ and 62 ₂ are appropriately driven according to the input of the aggregate 12. Or power may be supplied to the heating element 80. Alternatively, or in advance, it drives the microwave supply unit ₆₂ 1, 62 _2, supplies power to the heating element 80, leave the furnace section ₅₄ 1, 54 ₂ and heated to a first and second predetermined temperature The heat retaining furnace portion 52 may be heated to the second predetermined temperature.

In aggregate heating device 20, kept warm furnace section ₅₄ 1, 54 ₂ are provided in multiple stages in a heat retaining furnace 52 vertically, aggregate 12 that is heated by the heating furnace ₅₄ 1, 54 ₂ Since the heat is stored in the furnace 52 while being kept warm, the constant heated aggregate 12 can be continuously discharged. Therefore, the following operation is possible.

That is, as the discharge the fixed amount aggregate 12 from the heat retaining furnace 52, the aggregate 12 of approximately the same amount as the discharged aggregate 12, the heat retaining furnace 52 from the furnace unit 54 ₁ Open closing portion 64b ₁ The heat is supplied to the heat insulation furnace 52. Closing the opening portion 64b _1, supplies the aggregate 12 of the heating furnace unit ₅₄₂ in the heating furnace unit ₅₄₁ opens the opening and closing portion 64b _2. Closing the closing portion 64b _2, supplied from the hopper section 56 the aggregate 12 to the furnace section 54 ₁ Open closing portion 72b.

In such an operating method, so that the aggregate 12 respectively continuously constant amount is housed is heated and kept warm in a heating furnace unit 54 _1, 54 ₂ and kept furnace section 52. Therefore, the aggregate 12 heated from the aggregate heating device 20 can be discharged at any time.

Further, as shown in FIG. 2, by providing the heat insulating furnace portion 52 a plurality of furnace section 54 on _1, 54 _2, it is possible to heat in multiple stages, it can be processed aggregate 12 more efficiently It is. For example, the aggregate heating device 20, the heating furnace 54 ₁ of the lower portion, the aggregate 12 that is heated in a heating furnace unit ₅₄₂ of the upper portion is turned. Thus, since the aggregate 12 is heated in steps, more aggregate 12 can be heat-treated in the same time.

Thus, in the aggregate heating device 20, the aggregate 12 can be processed more efficiently by increasing the number of heating furnace sections 54 provided on the heat retaining furnace section 52. In this case, since the plurality of heating furnace portions 54 are provided vertically above, even when the installation place of the aggregate heating device 20 is limited, the space is effectively used to improve the processing efficiency of the aggregate 12. be able to. In the aggregate heating device 20, the heat treatment of the aggregate 12 can also be improved by increasing the capacity of the heating furnace section 54 and the heat retaining furnace section 52 and increasing the amount of microwave supply in the microwave supply section 62. Can do. Therefore, when the installation area is not limited, it is possible to improve the processing efficiency by adjusting the capacity of the heating furnace section 54 and the thermal insulation furnace section 52 and the supply amount of microwaves as described above. Thus, the structure of the aggregate heating device 20 has a higher degree of freedom in device design.

Further, since the

heating furnace parts

54 ₁ and 54 ₂ and the heat insulation furnace part 52 are provided in multiple stages in the vertical direction, the transportation of the aggregate into the

heating furnace parts

54 ₁ and 54 ₂ and the heat insulation furnace part 52 can be performed. It is easy and can be continuously heated and kept warm. Due to such continuity, the aggregate 12 can be efficiently heated and discharged.

For example, when processing is performed in a batch system, all the aggregate 12 in each furnace is once taken out, and the aggregate 12 is newly charged and newly heated, so that a longer heating time is required. . On the other hand, in the aggregate heating device 20, the aggregate 12 is an amount of the aggregate 12 corresponding to the amount of the aggregate 12 discharged from the heat insulation furnace section 52, and the aggregate 12 that has already been heated is converted into the heating furnace section. 54 can be supplied. Accordingly, a certain amount of the aggregate 12 heated during operation is continuously stored in the heat retaining furnace 52. Therefore, when the aggregate heating device 20 is used as the

aggregate heating devices

20A and 20B of the asphalt mixture manufacturing system 10 shown in FIG. 1, the aggregate 12 is heated continuously (the aggregate 12A or the aggregate 12B). As a result, it is possible to improve the production efficiency of the asphalt mixture 14.

From the viewpoint of suitably implementing the continuous process and operating as described above, for example, the amount of the aggregate 12 to be processed by heating container 68 _1, 68 _2, of the aggregate 12 to be discharged from the heat retaining furnace 52 Preferably it is approximately equal to the amount. The capacitance of the insulated container 86, with greater than desired emissions, it is preferably larger than the volume of the heating vessel 68 _1, 68 _2.

Further, since the aggregate heating apparatus 20 uses microwaves for heating the aggregate 12 in the heating furnace section 54, exhaust gas and odor are compared with conventional heating means using liquid fuel or gaseous fuel. In addition, the surrounding environment can be prevented from being destroyed or polluted by smoke or the like. Moreover, the aggregate can be heated to a desired temperature by passing an atmosphere heated to a desired temperature, compared to a conventional aggregate heating device that heats while rotating the aggregate in a rotating drum. Generation of vibration, noise and dust can be reduced.

Further, the hopper portion 56 provided on the heating furnace unit ₅₄₂ of the aggregate heating device 20, since there is provided a heat retaining furnace 52 to lower _first heating furnace 54 of the aggregate heating device 20, the hopper 56 and The heat insulation furnace 52 functions to prevent leakage of microwaves as high-frequency electromagnetic waves. As a result, the structure of the aggregate heating device 20 is configured to contribute to prevention of the occurrence of electromagnetic interference due to leakage of the microwave while using the microwave. Further, by providing the heating furnace part 54 ₁ , the heating furnace part 54 ₂ , and the hopper part 56 in this order on the heat insulation furnace part 52, the aggregate heating device 20 has a multistage structure, so that the upper furnace or hopper The bottom wall surface of the portion 56 functions as a partition that partitions each step. As a result, it is possible to maintain the uniformity of the temperature environment of each furnace.

Further, the crushed stone or sand aggregate 12 to be heated is not necessarily in a dry state, and there are cases where moisture adheres to the surface or moisture penetrates inside. Thus, the moisture adhering to the surface and the moisture penetrating inside are directly heated by the microwave. Therefore, in the aggregate heating apparatus 20, by using microwaves, moisture directly or the like is generated together with direct heating by the microwaves of the aggregate 12 itself and indirect heating by heat generated by the microwave absorber 70 absorbing the microwaves. Direct heating by microwaves also occurs. Therefore, the aggregate 12 having various features can be efficiently heated.

For example, in the new crushed aggregate 12A, some iron may be included. In this case, iron contained in the crushed stone absorbs the microwave and generates heat. In the recycled aggregate 12B mixed with oxidized slag and the like, the oxidized slag itself absorbs microwaves and generates heat. Therefore, when the aggregate heating device 20 is applied as the

aggregate heating devices

20A and 20B for heating the new aggregate 12A and the recycled aggregate 12B, respectively, heating can be performed more efficiently.

As mentioned above, although embodiment of the aggregate heating apparatus and aggregate heating method which concern on this invention was described, this invention is not limited to the said embodiment. For example, it is sufficient that one heating furnace portion 54 is provided on the heat retaining furnace portion 52. Even in this case, it is possible to store the aggregate 12 heated in the heating furnace section 54 while keeping the temperature in the heat holding furnace section 52, and has the continuity of the processing described above. Therefore, it is possible to process the aggregate 12 efficiently. Moreover, the number of the heating furnace parts 54 on the heat insulation furnace part 52 may be three or more. In other words, one or more heating furnace sections 54 may be provided on the heat retaining furnace section 52. The number of heating furnaces 54 can be determined according to the amount of processing of the aggregate 12 in the aggregate heating device 20 and the required performance.

In the description of the above embodiment, for example, the hopper portion 56 as a lid portion is provided on the multistage structure including the heat retaining furnace portion 52 and the two heating furnace portions 54, but the present invention is not limited to this. For example, it may be of integral heating furnace unit ₅₄₂ and the hopper portion 56 of the uppermost. In other words, the heating furnace unit ₅₄₂ of the uppermost stage has a top wall, it may be the shape of the outer surface with hopper-shaped.

Furthermore, although the aggregate heating apparatus 20 shown in FIG. 2 is provided with the hopper portion 56 as a lid portion, the lid portion may not be provided. For example, the heating furnace 54 located at the uppermost stage of the aggregate heating apparatus in this case may be configured to have an upper wall, and an aggregate input port that can be opened and closed may be provided on the upper wall. Moreover, it can be said that it is the structure which does not have a cover part also when the uppermost heating furnace part 54 has an upper wall as mentioned above and the shape of the outer surface is made into a hopper shape.

Further, although the microwave supply unit 62 is provided on the side wall 58, it may be provided so that the aggregate 12 in the heating container 68 can be efficiently irradiated with microwaves. Moreover, you may provide the heat generating body 80 so that it may wind around the outer periphery of the heat insulation container part 86, for example. Furthermore, in the heat insulating furnace 52, it is possible to heat the aggregate 12 by an optical heating method using infrared rays in addition to the exemplified electric heating method. In this case, a halogen lamp may be provided in the heat insulating furnace 52 as an infrared source.

In the above embodiment, the microwave absorber 70 is disposed in the heating furnace section 54, but the microwave absorber 70 may be omitted. This is because the aggregate 12 itself absorbs microwaves and generates heat. However, by providing the microwave absorber 70, the aggregate 12 can be efficiently heated using indirect heating.

Furthermore, although the shape when the heating furnace part 54, the heating container part 68, the heat insulating furnace part 52, and the heat insulating container part 86 are viewed from the charging side of the aggregate 12 is substantially rectangular, it is not limited thereto. These shapes may be circular, for example. In addition, the shapes of the heating container portion 68 and the heat retaining container portion 86 are not particularly limited as long as the aggregate 12 smoothly flows into the aggregate discharge portions 64 and 82 in order to discharge the aggregate 12. For example, a configuration in which the second

cylindrical portions

68 and 86 are not provided may be employed.

Moreover, although the opening parts 64a and 82a are each provided in the center part of the bottom walls 60 and 78, the position of the opening parts 64a and 82a is provided in the bottom part of the heating furnace part 54 and the heat insulation furnace part 52, Any position where the aggregate 12 can be discharged to the lower stage or the outside may be used. Further, the opening and closing section _{_{64b 1, 64b 2, 72b,}} 82b has been illustrated a case which is composed of a microwave shielding material is not limited thereto. However, it is preferable that the opening /

closing portions

64b ₁ , 64b ₂ , 72b, and 82b are made of a microwave shielding material because microwave leakage can be further prevented. In particular, the opening / closing part 82b is preferably made of a microwave shielding material.

Furthermore, although control by the control apparatus 50 which controls the whole asphalt mixture manufacturing system was illustrated as control of the aggregate heating apparatus 20, the aggregate heating apparatus 20 may be provided with the control part, for example. The control unit in this case may be provided with a control function of the aggregate heating device 20 by the control device 50 described in the above embodiment. And when the aggregate heating apparatus 20 is provided with a control part, what is necessary is just to input the discharge | emission amount etc. which are required for control of the aggregate heating apparatus 20 into a control part as input information suitably. The input of the predetermined information to the control unit may be input in advance by an operator when a change occurs, or may be input from the control device 50 by electrically connecting the control device 50 of the entire system. You can also

Furthermore, the heating furnace unit 54 included in the aggregate heating device 20 may include a stirring unit that stirs the aggregate 12 during heating. A configuration of an embodiment of a heating furnace unit having a stirring unit will be described by taking as an example a case where two heating furnace units 92 and 92 are provided on the heat insulating furnace unit 52. In the following description, when it is necessary to distinguish between the _two heating furnace portions 92 and 92, they are referred to as heating furnace portions 92 ₁ and 92 ₂ for convenience as in the case of the

heating furnace portions

54 and 54. The constituent elements of the furnace portions 92 and 92 are also described in the same manner.

Figure 4 is a sectional view showing another embodiment of a heating furnace unit, shows a part of the furnace section 92 ₁ and the heating furnace section 92 _2. Construction of the furnace section 92 ₁ and the heating furnace section 92 ₂ is because it is substantially the same, the configuration of the heating furnace 92 _1. FIG. 5 is an enlarged view of an example of a cross-sectional configuration orthogonal to the axis of the rotation axis of the stirring unit shown in FIG.

Furnace unit 92 ₁ shown in FIGS. 4 and 5, in that it includes a stirring unit 94 _1, mainly differs from the furnace section ₅₄ 1 (54).

Furnace section 92 _1, agitating the aggregate 12 by the stirring unit 94 ₁ during heating. Furnace unit 92 ₁ has a cylindrical portion 98 ₁ stirring unit 94 ₁ is disposed on the inner side. Examples of a shape viewed cylindrical upper 98 ₁ from the upper side has a substantially square shape. Between the opening 64a ₁ of the cylindrical portion 98 ₁ and the bottom wall 60 _1, the opening and closing portion 64b ₁ is disposed, by opening and closing part 64b ₁ is closed, aggregate 12 in the cylindrical portion 98 in ₁ Can be accommodated. Thus, the tubular portion 98 ₁ is also a heating container portion for accommodating the aggregate 12 during heating. Examples of the tubular portion 98 ₁ of the material, but may be similar to the heating container 68 _1, also a heat insulating material, such as described in the case of heating the container portion 68 ₁ as having been coated such as a ceramic Good.

The tubular portion 98 _1, a plurality of stirring units 94 ₁ is disposed (see FIG. 5). Mixing unit 94 ₁ has a rotary shaft 94A _1, and a plurality of stirring blades 94B ₁ provided on the rotating shaft 94A _1. A plurality of stirring units 94 _1, rotation shaft 94A ₁ are substantially parallel to each other.

The rotation axis of the agitating unit 94 ₁ 94A ₁ is connected via the driving force transmitting unit 102 ₁ to the drive source 100 _1. Examples of the driving source 100 ₁ is a rotating motor, an example of the driving force transmitting unit 102 ₁ is a gear train. Driving source 100 ₁ may be controlled by the control device 50. Rotary shaft 94A ₁ is rotated by the driving force of the driving source 100 _1. At this time, the rotation directions of the adjacent rotation shafts 94A ₁ and 94A ₁ are preferably opposite to each other as shown in FIG. This is because the aggregate 12 can be suppressed from being biased in one direction by stirring. Rotational direction of the rotary shaft 94A _1, for example, adjusts the driving force transmitting unit 102 _1.

An example of the opening / closing part 64b _{1 included in} the heating furnace part 92 ₁ is a pair of slide gates 106 ₁ and 106 ₁ . The pair of slide gates 106 ₁ , 106 ₁ are arranged to face each other, and when closed, together with the tubular portion 98 ₁ , constitute a housing portion for the aggregate 12.

The upper surface of the slide gate 106 _1, the rotary shafts 94A ₁ of the rotary shaft 94A grooves 104 ₁ extending in the extending direction of ₁ downward is formed. Cross-sectional shape of each groove 104 ₁ has an approximately semicircular shape as shown in FIG. Curvature of the groove 104 ₁ of the inner surface radius approximately equal to the length of the radial direction of the agitating blades 94B _1.

Central portion of the groove portion 104 ₁ and the groove portion 104 ₁ adjacent Since located below the central portion of the rotary shaft _94A 1, 94A ₁ adjacent, by rotation of the stirring blade 94B _1, groove ₁₀₄ adjacent 1, 104 ₁ It is possible to suppress the aggregate 12 from accumulating in the central part. The closing part 64b _1, if a pair of slide gate ₁₀₆ 1, 106 ₁ of the above configuration, a pair of wall surfaces for supporting the rotation shaft 94A ₁ in the tubular portion 98 _1, the sliding gate ₁₀₆ 1, 106 ₁ movable In addition, the aggregate 12 can be accommodated when the slide gates 106 ₁ and 106 ₁ are closed. Sliding gate 106 ₁ may be provided to slidably furnace portion 92 ₁ by the slide rails or rollers.

The slide gate 106 _1, the piston 108a ₁ of cylinder 108 ₁ is connected. Examples of the cylinder 108 ₁ is an air cylinder or a hydraulic cylinder. By cylinder 108 ₁ to stretch the piston 108a _1, the slide gate 106 ₁ openings 64a ₁ is opened and closed controlled by sliding. Therefore, the cylinder 108 ₁ functions as the opening / closing control unit 66 ₁ .

Although the opening / closing part 64b ₁ has been described as a pair of slide gates 106 ₁ , 106 ₁ , the opening / closing part 64b ₁ has a configuration in which a plurality of opposed slide gates 106 ₁ , 106 ₁ are arranged in a direction perpendicular to the sliding direction. It can also be. Further, the opening and closing portion 64b ₁ may be one of the sliding gate 106 ₁ If closing the opening 64b _1.

Although not described in FIG. 4 and 5, the furnace section 92 ₁ microwave supply unit 62 ₁ supplies microwaves to, as in the case of the heating furnace 54, a microwave aggregate 12 What is necessary is just to be provided so that it can irradiate.

In the heating furnace section 92 _1, heating the aggregate 12 with stirring aggregate 12 at a stirring unit 94 _1. Therefore, the aggregate 12 is easily irradiated with microwaves, and as a result, the aggregate 12 can be heated more efficiently.

When the aggregate heating device 20 includes the heating furnace unit 92 having the above-described configuration, the open /

close units

82b and 72b for the heat insulating furnace unit 52 and the hopper unit 56 also use slide gates having the same configuration as the slide gate 106. be able to. In this case, an example of the configuration of the hopper portion 56 is such that a hopper main body portion that functions as a hopper is arranged inside the hopper accommodating portion. The hopper accommodating part has the side wall 58 and the bottom wall 60 of the heating furnace part 92, and the side wall and bottom wall of the same structure. The pair of slide gates as the opening / closing portion 72b is provided between an opening formed in the bottom wall of the hopper accommodating portion and the hopper body portion. In this configuration, the opening formed in the bottom wall of the hopper accommodating portion corresponds to the opening 72a in the aggregate heating device 20 shown in FIG. 2, and a pair of the opening of the hopper accommodating portion and the opening / closing portion 72b. The slide gate constitutes the opening / closing control unit 72.

DESCRIPTION OF SYMBOLS 10 ... Asphalt compound manufacturing system, 12 ... Aggregate, 12A ... New aggregate, 12B ... Recycled aggregate, 14 ... Asphalt compound, 20, 20A, 20B ... Aggregate heating device, 52 ... Incubator part, 54, 54 ₁ , 54 ₂ ... heating furnace part, 56 ... hopper part (lid part), 60, 60 ₁ , 60 ₂ ... bottom wall (bottom part) of the heating furnace part, 62, 62 ₁ , 62 ₂ ... microwave supply part, 64, 64 ₁ , 64 ₂ ... aggregate discharge part (first aggregate discharge part), 82 ... aggregate discharge part (second aggregate discharge part), 68, 68 ₁ , 68 ₂ ... heating container part, 70, 70 _1, 70 2 _... microwave absorber, 72 ... aggregate loading portion, 78 ... bottom wall (bottom) of the heat insulation furnace section, 86 ... insulated container portion, ₉₂ 1, 92 2 _... furnace section, 94 ₁ ... a stirring unit.

Claims

At least one heating furnace for heating the aggregate constituting the asphalt mixture by a heating method based on microwaves;
A heat retaining furnace section that retains the aggregate heated in the at least one heating furnace section by an electrical or optical heating method;
A microwave supply section for supplying the microwave into the heating furnace section;
With
The heat-retaining furnace part and the heating furnace part are provided in the vertical direction in this order to constitute a multistage structure,
The partition part separating the stages constituting the multi-stage structure is provided with a first aggregate discharging part that can be opened and closed and discharges the aggregate to the lower stage,
The bottom of the heat retaining furnace is provided with a second aggregate discharging part that can be opened and closed and for discharging the aggregate that is kept warm in the heat retaining furnace.
Aggregate heating device.
The aggregate heating apparatus according to claim 1, wherein a plurality of the heating furnace parts are provided in multiple stages on the heat insulation furnace part.
The aggregate heating apparatus according to claim 1 or 2, further comprising a microwave absorber provided in the heating furnace.
The heating furnace part further includes a stirring unit for stirring the aggregate,
The stirring unit includes:
A rotation axis;
A plurality of stirring blades provided on the rotating shaft;
Having
The aggregate heating apparatus according to any one of claims 1 to 3.
In the heating furnace part that is positioned on the heat insulation furnace part in the vertical direction and constitutes a multistage structure together with the heat insulation furnace part, a heating process for heating the aggregate constituting the asphalt mixture by a heating method based on microwaves, and
A first aggregate discharging step of opening a first aggregate discharging section provided at the bottom of the heating furnace section and opening and closing and discharging the aggregate to an adjacent lower stage of the multistage structure;
In the heat retaining furnace part, in the multistage structure, a heat retaining step of retaining the aggregate heated by the upper stage part adjacent to the heat retaining furnace part by an electrical or optical heating method;
A second aggregate discharging step of opening a second aggregate discharging section provided at the bottom of the heat retaining furnace section and opening and closing and discharging the aggregate to the outside of the heat retaining furnace section;
An aggregate heating method comprising:
A plurality of the heating furnace portions are provided in multiple stages in the vertical direction,
The heat-retaining furnace part is adjacent to the lowermost heating furnace part among the plurality of heating furnace parts provided in multiple stages,
In the heating step, the aggregate is heated in order from the uppermost stage in a plurality of heating furnaces provided in multiple stages.
The aggregate heating method according to claim 5.
The aggregate heating method according to claim 5 or 6, wherein in the heating step, the aggregate is heated while being stirred by a stirring unit.