Aggregate conveying device, asphalt plant, and method for manufacturing asphalt mixture

Abstract

To provide an aggregate conveying device that can minimize power consumption, extend cleaner maintenance intervals, and minimize man-hours for deposit processing.SOLUTION: An aggregate conveying device 3 for use in asphalt mixtures has multiple hoppers 25A-25H each containing a different type of aggregate 19A-19H, multiple feeders 27A-27H each capable of adjusting the amount of aggregates dispensed from each of the multiple hoppers 25, a conveyor 29 for conveying the aggregates 19 discharged from the hopper 25 by the feeder 27 to an aggregate dryer 5, a cleaner 35 for cleaning the conveyor 29 and a control part 33 that adjusts the conveying speed of the aggregates 19 according to the total amount of the aggregates 19 dispensed from each of the hoppers 25.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an aggregate conveying device, an asphalt plant, and a method for producing an asphalt mixture. [Background technology]

[0002] Conventionally, there is known an asphalt plant that includes aggregate discharged from a hopper, a conveyor for transporting the aggregate, and an aggregate dryer for drying the aggregate transported by the conveyor. This asphalt plant further produces an asphalt mixture by mixing the aggregate discharged from the aggregate dryer with filler and asphalt.

[0003] Conveyors in conventional asphalt plants transport aggregate at a constant speed (for example, a constant high speed when the conveyor can transport the maximum amount of aggregate). In contrast, technologies have been disclosed that change the conveyor speed depending on the amount of material being transported, etc. (See Patent Documents 1, 2, and 3). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Unexamined Patent Publication No. 162485 [Patent Document 2] Japanese Patent Application Publication No. 61-287615 [Patent Document 3] Patent No. 3336712 Summary of the Invention [Problem to be solved by the invention]

[0005] Conventional asphalt plant conveyors transport aggregate at a constant, high speed regardless of the amount of aggregate being transported. This increases the conveyor's power consumption, shortens the intervals between cleaner maintenance to clean the conveyor's transport parts (e.g., belt), and increases the amount of fallen material (aggregate adhering to the belt) that is removed by the cleaner. Furthermore, it requires a lot of man-hours to process the piles of fallen material.

[0006] The present invention aims to provide an aggregate transport device that minimizes power consumption, extends the interval between cleaner maintenance, and minimizes the man-hours required for deposit treatment. It also aims to provide an asphalt plant and an asphalt mixture manufacturing method that can achieve the same effects as the aggregate transport device. [Means for solving the problem]

[0007] The invention described in claim 1 includes a plurality of hoppers each containing different types of aggregate; a plurality of feeders each provided for each of the plurality of hoppers and capable of freely adjusting the amount of aggregate discharged from each of the plurality of hoppers; a conveyor that transports the aggregate discharged from the plurality of hoppers by the plurality of feeders to an aggregate dryer; a cleaner that cleans the conveyor; and a control unit that controls the plurality of feeders so that the amount of aggregate discharged from each of the plurality of hoppers becomes a target value, and controls the conveyor so as to adjust the conveying speed of the aggregate in accordance with the total amount of aggregate discharged from each of the plurality of hoppers. The plurality of hoppers and the plurality of feeders are arranged in a line in a conveying direction of the aggregate on the conveyor, and when no aggregate is placed on the conveyor and the conveying speed of the conveyor is at a target value, the control unit starts discharging the aggregate to the conveyor in order from a hopper among the plurality of hoppers located on an upstream side in the conveying direction of the aggregate on the conveyor to a hopper among the plurality of hoppers located on a downstream side in the conveying direction of the aggregate on the conveyor, and controls the plurality of feeders so that the total amount of aggregate discharged from each of the plurality of hoppers becomes the target amount at the hopper among the plurality of hoppers located on the most downstream side in the conveying direction of the aggregate on the conveyor. This is a conveying device for aggregate used in asphalt mixtures.

[0008] The invention described in claim 2 is An asphalt plant comprising: the aggregate conveying device of claim 1; the aggregate dryer that dries the aggregate conveyed by the conveyor; a powder capturing device that captures the powder coming out of the aggregate dryer while the aggregate is being dried by the aggregate dryer; a hot bin that stores the aggregate dried by the aggregate dryer; a stone powder silo that stores stone powder; an asphalt tank that stores asphalt; and a mixer that produces an asphalt mixture by mixing the powder captured by the powder capturing device, the aggregate supplied from the hot bin, the stone powder supplied from the stone powder silo, and the asphalt supplied from the asphalt tank.

[0009] The invention described in claim 3 is The apparatus includes a plurality of hoppers each containing different types of aggregate, a plurality of feeders each provided for each of the plurality of hoppers and capable of freely adjusting the amount of aggregate discharged from each of the plurality of hoppers, a conveyor for transporting the aggregate discharged from the plurality of hoppers by the plurality of feeders to an aggregate dryer, a cleaner for cleaning the conveyor, and a cleaner for controlling the plurality of feeders so that the amount of aggregate discharged from each of the plurality of hoppers becomes a target value, and a cleaner for cleaning the conveyor in response to the total amount of aggregate discharged from each of the plurality of hoppers. an aggregate conveying device having a control unit for controlling the conveyor so as to adjust the conveying speed of the aggregate according to the amount of the aggregate; an aggregate dryer for drying the aggregate conveyed by the conveyor; a powder capturing device for capturing powder coming out of the aggregate dryer when the aggregate is being dried by the aggregate dryer; a hot bin for storing the aggregate dried by the aggregate dryer; a stone powder silo for storing stone powder; an asphalt tank for storing asphalt; and a control unit for controlling the control unit for controlling the conveyor so as to adjust the conveying speed of the aggregate according to the amount of the aggregate dryer; an aggregate dryer for drying the aggregate conveyed by the conveyor; a powder capturing device for capturing powder coming out of the aggregate dryer when the aggregate is being dried by the aggregate dryer; a hot bin for storing the aggregate dried by the aggregate dryer; a stone powder silo for storing stone powder; an asphalt tank for storing asphalt; The system further comprises a mixer that generates an asphalt mixture by mixing stone powder and asphalt supplied from the asphalt tank, and a recycle dryer that recycles asphalt pavement waste, wherein the mixer is configured to generate an asphalt mixture by mixing the asphalt pavement waste recycled by the recycle dryer with the powder captured by the powder capture device, aggregate supplied from the hot bin, stone powder supplied from the stone powder silo, and asphalt supplied from the asphalt tank, The amounts of powder captured by the powder capture device, aggregate supplied from the hot bin, stone powder supplied from the stone powder silo, and asphalt supplied from the asphalt tank, relative to the amount of asphalt pavement waste recycled by the recycle dryer supplied to the mixer, are target values ​​in the specifications of the asphalt mixture, and the recycle dryer is configured to recycle asphalt pavement waste at or near the upper limit of the amount of recycled asphalt pavement waste in the recycle dryer and supply it to the mixer. It is an asphalt plant.

[0010] The invention described in claim 4 is the conveyor includes a plurality of hoppers each containing different types of aggregate; a plurality of feeders each provided in each of the plurality of hoppers and capable of adjusting the amount of aggregate discharged from each of the plurality of hoppers; a conveyor for transporting the aggregate discharged from the plurality of hoppers by the plurality of feeders to an aggregate dryer; a cleaner for cleaning the conveyor; and a control unit for controlling the plurality of feeders so that the amount of aggregate discharged from each of the plurality of hoppers becomes a target value, and for controlling the conveyor so as to adjust the conveying speed of the aggregate in accordance with the total amount of aggregate discharged from each of the plurality of hoppers, the plurality of hoppers and the plurality of feeders being arranged side by side in the conveying direction of the aggregate on the conveyor, and the control unit for controlling the conveyor to adjust the conveying speed of the aggregate in accordance with the total amount of aggregate discharged from each of the plurality of hoppers, when no aggregate is placed on the conveyor and the conveying speed of the conveyor is at the target value, from a hopper among the plurality of hoppers located upstream in the conveying direction of the aggregate on the conveyor, to a hopper among the plurality of hoppers located upstream in the conveying direction of the aggregate on the conveyor. the asphalt tank for storing asphalt; and a mixer for producing an asphalt mixture by mixing the powder captured by the powder capture device, the aggregate supplied from the hot bin, the stone powder supplied from the stone powder silo, and the asphalt supplied from the asphalt tank.This asphalt plant has a recycle dryer that recycles asphalt pavement waste, and the mixer is configured to produce an asphalt mixture by mixing the asphalt pavement waste recycled by the recycle dryer with the powder captured by the powder capture device, aggregate supplied from the hot bin, stone powder supplied from the stone powder silo, and asphalt supplied from the asphalt tank, and the amounts of the powder captured by the powder capture device, aggregate supplied from the hot bin, stone powder supplied from the stone powder silo, and asphalt supplied from the asphalt tank supplied relative to the amount of asphalt pavement waste recycled by the recycle dryer supplied to the mixer are target values ​​in the specifications of the asphalt mixture, and the recycle dryer is configured to recycle asphalt pavement waste at or near the upper limit of the amount of recycled asphalt pavement waste in the recycle dryer and supply it to the mixer.

[0011] The invention described in claim 5 includes an aggregate discharging step of discharging a target amount of aggregate onto a conveyor from each of a plurality of hoppers each containing a different type of aggregate; an aggregate transporting step of adjusting the transport speed of the aggregate discharged from each of the plurality of hoppers and transported by the conveyor depending on the total amount of aggregate discharged in the aggregate discharging step; a cleaning step of cleaning the conveyor; an aggregate drying step of drying the aggregate transported in the aggregate transporting step; a powder capturing step of capturing powder generated when drying the aggregate in the aggregate drying step; and an asphalt mixture producing step of producing an asphalt mixture by using a mixer to mix the powder captured by the powder capturing device, the aggregate dried in the aggregate drying step, stone powder supplied from a stone powder silo, and asphalt supplied from an asphalt tank. The asphalt mixture generating step is a step of mixing, using the mixer, the asphalt pavement waste recycled by the recycle dryer, the powder captured in the powder capturing step, the aggregate dried in the aggregate drying step, the stone powder supplied from the stone powder silo, and the asphalt supplied from the asphalt tank, and the ratio of the amount of the powder captured in the powder capturing step to the amount of the asphalt pavement waste recycled by the recycle dryer supplied to the mixer is The amount of aggregate dried in the aggregate drying step, the amount of aggregate supplied to the mixer, the amount of stone powder supplied from the stone powder silo to the mixer, and the amount of asphalt supplied from the asphalt tank to the mixer are all target values ​​in the specifications of the asphalt mixture, and the recycle dryer recycles asphalt pavement waste at or near the upper limit of the amount of recycle of asphalt pavement waste in the recycle dryer, and supplies the entire amount of the recycle asphalt pavement waste to the mixer. A method for manufacturing an asphalt mixture. [Effects of the Invention]

[0013] The present invention has the effect of providing an aggregate transport device that minimizes power consumption, extends the interval between cleaner maintenance, and minimizes the man-hours required for deposit treatment.Furthermore, it has the effect of providing an asphalt plant and an asphalt mixture manufacturing method that can achieve the same effects as the aggregate transport device. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a diagram showing a schematic configuration of an asphalt plant according to an embodiment of the present invention. [Figure 2] 1 is a diagram showing a schematic configuration of an aggregate conveying device according to an embodiment of the present invention; [Figure 3] 1 is a diagram showing a schematic configuration of an aggregate conveying device according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0015] As shown in Figure 1, an asphalt plant 1 according to an embodiment of the present invention is configured to include an aggregate conveying device 3, an aggregate dryer 5, a powder capturing device 7, a hot bin 9, a stone powder silo 11, an asphalt tank 13, and a mixer 15.

[0016] The aggregate conveying device (asphalt aggregate supplying device) 3 conveys aggregate 19 (see Figures 2 and 3) discharged from a hopper 25 to the aggregate dryer 5. The aggregate dryer 5 heats and dries the aggregate 19 conveyed by the conveyor 29 of the aggregate conveying device 3.

[0017] The powder capture device (e.g., a filtering device) 7 is configured to capture, for example, by filtering, the powder coming out of the aggregate dryer 5 when the aggregate 19 is being dried by the aggregate dryer 5. The hot bin 9 is configured to store the aggregate 19 dried by the aggregate dryer 5. The stone powder silo 11 is configured to store stone powder (filler), and the asphalt tank 13 is configured to store asphalt.

[0018] The mixer 15 mixes the powder captured by the powder capture device 7, aggregate 19 supplied from the hot bin 9, stone powder supplied from the stone powder silo 11, and asphalt supplied from the asphalt tank 13. By mixing these ingredients together, an asphalt mixture is produced.

[0019] The asphalt plant 1 is also provided with a recycle dryer 23. The recycle dryer 23 heats and dries waste asphalt pavement material to regenerate it.

[0020] The mixer 15 of the asphalt plant 1, which is provided with the recycle dryer 23, also mixes in the asphalt pavement waste material recycled by the recycle dryer 23 to produce an asphalt mixture.

[0021] To explain further, mixer 15 produces an asphalt mixture by mixing asphalt pavement waste recycled by recycle dryer 23 with asphalt mixture components such as powder captured by powder capture device 7. As already understood, the asphalt mixture components include the powder captured by powder capture device 7, aggregate 19 supplied from hot bin 9, stone powder supplied from stone powder silo 11, and asphalt supplied from asphalt tank 13.

[0022] In addition, the amount of asphalt mixture constituents supplied to the mixer 15 relative to the amount of asphalt pavement waste recycled by the recycle dryer 23 is a target value in the specifications of the asphalt mixture.

[0023] The recycle dryer 23 is configured to regenerate asphalt pavement waste at or near the upper limit of the amount of regenerated asphalt pavement waste in the recycle dryer 23, and to supply the entire amount of this regeneration to the mixer 15. On the other hand, the supply amount of the asphalt mixture components is configured to change depending on the specifications of the asphalt mixture.

[0024] For example, the amount of asphalt pavement waste material supplied from the recycle dryer 23 to the mixer 15 per predetermined time is "Qa kg / min." This "Qa kg / min" is 80% to 100% (more preferably 90% to 100%) of the regeneration capacity of the recycle dryer 23 for regenerating asphalt pavement waste material.

[0025] At this time, it is assumed that the amount of powder captured by the powder capturing device 7 supplied to the mixer 15 per hour is "Qbkg / min". It is assumed that the amount of aggregate 19 supplied from the hot bin 9 supplied to the mixer 15 per hour is "Qckg / min". It is assumed that the amount of stone powder supplied from the stone powder silo 11 supplied to the mixer 15 per hour is "Qdkg / min". It is assumed that the amount of asphalt supplied from the asphalt tank 13 supplied to the mixer 15 per hour is "Qekg / min".

[0026] The total value of "Qbkg / min" and "Qdkg / min" supplied to the mixer 15 varies between 1% and 99% depending on the specifications of the asphalt mixture. The value of "Qckg / min" supplied to the mixer 15 also varies between 1% and 99% depending on the specifications of the asphalt mixture. The value of "Qekg / min" supplied to the mixer 15 also varies between 1% and 99% depending on the specifications of the asphalt mixture.

[0027] As shown in Figures 2 and 3, the aggregate conveying device 3 is configured to include multiple hoppers (aggregate hoppers) 25, multiple feeders (aggregate feeders) 27, a conveyor (e.g., a belt conveyor) 29, a cleaner 31, and a control unit (control device feeder) 33 (see Figure 1).

[0028] Each of the plurality of hoppers 25 is adapted to accommodate a different type of aggregate 19 (for example, new aggregate made up of crushed stone and sand and having different particle sizes).

[0029] For example, the first hopper 25A is designed to store only large-grained crushed stone 19A, the second hopper 25B is designed to store only small-grained crushed stone 19B, and so on. Similarly, the grain size of the aggregate 19 stored decreases as the number indicating the order of the hopper 25 increases. If there are eight hoppers 25, the eighth and final hopper, 25H, is designed to store sand 19H.

[0030] Each of the plurality of feeders 27 is provided for each of the plurality of hoppers 25. That is, each of the plurality of feeders 27 is provided at the discharge port of each of the plurality of hoppers 25 from which the aggregates 19 are discharged.

[0031] Each of the plurality of feeders 27 is capable of freely adjusting the amount (flow rate; mass dispensed per time) of the aggregate 19 dispensed (coming out) from each of the plurality of hoppers 25.

[0032] More specifically, one hopper 25 is provided with one feeder 27. The multiple feeders 27 are each capable of independently adjusting the amount of aggregate 19 dispensed from the hopper 25. For example, the feeder 27A of the first hopper 25A continuously dispenses a predetermined amount of crushed stone per minute, and the feeder 27B of the second hopper 25B continuously dispenses 50% of the amount of crushed stone dispensed by the feeder 27A of the first hopper 25A. Similarly, the feeders 27 of the third and subsequent hoppers 25 continuously dispense a predetermined proportion of aggregate 19 relative to the amount dispensed by the feeder 27A of the first hopper 25A. The amounts and proportions of these dispensed amounts can be adjusted as needed.

[0033] The conveyor (first conveyor for aggregate) 29 is configured to transport the aggregate 19 discharged from the plurality of hoppers 25 by the plurality of feeders 27 to the aggregate dryer 5. The conveyor 29 transports the aggregate 19 by placing the aggregate 19 on a circular transport belt.

[0034] The cleaner 31 cleans the portion of the conveyor 29 that is not transporting the aggregates 19 (the portion of the transport belt) by, for example, bringing a scraper 35 into contact with the transport belt.

[0035] 1 includes a CPU 37 and a memory 39. The control unit 33 controls the plurality of feeders 27 and the conveyor 29.

[0036] That is, the control unit 33 controls each of the plurality of feeders 27 so that the amount of aggregate 19 discharged from each of the plurality of hoppers 25 becomes a target value. The control unit 33 also controls the conveyor 29 so as to adjust the conveying speed of the aggregate 19 in accordance with the total amount (total quantity) of the aggregate 19 discharged from each of the plurality of hoppers 25.

[0037] For example, when the total amount of aggregate 19 dispensed from each of the multiple hoppers 25 is large, the conveying speed of the aggregate 19 by the conveyor 29 is increased. On the other hand, when the total amount of aggregate 19 dispensed from each of the multiple hoppers 25 is small, the conveying speed of the aggregate 19 by the conveyor 29 is decreased.

[0038] The control unit 33 controls not only the aggregate transport device 3 but also the entire asphalt plant 1.

[0039] The multiple hoppers 25 and the multiple feeders 27 are arranged side by side in the conveying direction of the aggregates 19 on the conveyor 29. For example, in FIGS. 1 to 3, the hoppers 25 and the feeders 27 are arranged in the following order from the upstream side to the downstream side in the conveying direction of the aggregates 19 on the conveyor 29: hopper 25A and feeder 27A, hopper 25B and feeder 27B, and so on.

[0040] The control unit 33 starts the conveyor 29 from an initial state in which no aggregates 19 are placed on the conveyor 29 and the conveyor 29 is stopped, and when the conveying speed (belt moving speed) of the conveyor 29 reaches a target value (a target constant value), it performs the following control. For example, it controls the composition ratio and amount of the aggregates 19, etc. supplied to the mixer 15 to reach the target values.

[0041] 2 and 3, the aggregate 19 starts to be discharged to the conveyor 29 from the hopper 25A and the feeder 27A to the hopper 25H and the feeder 27H in that order. The hopper 25A and the feeder 27A are located on the upstream side (the most upstream side) of the multiple hoppers 25 (the multiple feeders 27) in the conveying direction of the aggregate 19 on the conveyor 29. The hopper 25H and the feeder 27H are located on the downstream side (the most downstream side) of the multiple hoppers 25 (the multiple feeders 27) in the conveying direction of the aggregate 19 on the conveyor 29.

[0042] In addition, the control unit 33 controls the multiple feeders 27 at the hoppers 25H and the feeders 27H so that the total amount (total quantity) of aggregate 19 dispensed from each of the multiple hoppers 25 becomes the target amount.

[0043] The asphalt plant 1 will now be described in more detail.

[0044] As shown in Fig. 1, the aggregate conveying device 3 is further provided with a second aggregate conveyor 41 and a third aggregate conveyor 43. The aggregate 19 coming out of the hopper 25 passes through the first aggregate conveyor 29, the second aggregate conveyor 41, and the third aggregate conveyor 43 in this order, and is supplied to the aggregate dryer 5. Reference numeral 45 in Fig. 1 denotes a weighing device that measures the mass of the aggregate 19 immediately before it is supplied to the aggregate dryer 5.

[0045] The asphalt pavement waste is discharged from a recycled pavement waste hopper 47 to a recycled pavement waste conveyor (first recycled pavement waste conveyor) 51 by a recycled pavement waste feeder 49 .

[0046] The recycled pavement scrap delivered to the first recycled pavement scrap conveyor 51 passes through the second recycled pavement scrap conveyor 53 and is supplied to the recycling dryer 23. Reference numeral 55 in FIG. 1 denotes a weighing machine that measures the mass of the recycled pavement scrap immediately before it is supplied to the recycling dryer 23.

[0047] Also, reference numeral 57 in Fig. 1 denotes a weighing instrument that measures the mass of the aggregate 19 and recycled pavement waste that are supplied to the mixer 15. Reference numeral 59 in Fig. 1 denotes a weighing instrument that measures the mass of the filler that is supplied to the mixer 15. Reference numeral 61 in Fig. 1 denotes a weighing instrument that measures the mass of the asphalt that is supplied to the mixer 15. The asphalt mixture produced in the mixer 15 is used for road paving and the like.

[0048] Next, the operation of the aggregate conveying device 3 will be described.

[0049] In the initial state, no aggregates 19 are placed on the conveyor 29, the conveyor 29 is in operation, and the conveying speed of the conveyor 29 is set to a target value (a constant target value).

[0050] In this initial state, first, a predetermined amount of aggregate 19A is discharged from hopper 25A onto conveyor 29 (see arrow A1 in FIG. 2(a)). This predetermined amount of aggregate 19A is continuously discharged thereafter.

[0051] Next, a predetermined amount of aggregate 19B is discharged from hopper 25B onto conveyor 29 (see arrow A2 in FIG. 2(b)). This predetermined amount of aggregate 19B is continuously discharged thereafter. Next, a predetermined amount of aggregate 19C is discharged from hopper 25C onto conveyor 29 (see arrow A3 in FIG. 3(a)). This predetermined amount of aggregate 19C is continuously discharged thereafter. In a similar manner, aggregates 19D to 19H are discharged (see arrows A4 to A8 in FIG. 3(b)).

[0052] As shown in Figures 2 and 3, the timing at which each hopper 25 starts to dispense aggregate 19 becomes later from hopper 25A to hopper 25H. Directly below hopper 25H, for example, the ratio of the amounts of aggregates 19A, 19B, 19C, 19D, 19E, 19F, 19G, and 19H is set to a target value. Also, the total amount of aggregates 19A, 19B, 19C, 19D, 19E, 19F, 19G, and 19H is set to a target value.

[0053] 3(a) and other figures, the leading ends of aggregates 19A, 19B, and 19C are aligned with one another in the conveying direction of conveyor 29. These leading ends are downstream ends in the conveying direction of conveyor 29. Furthermore, the leading ends of aggregates 19A to 19H are aligned with one another in the conveying direction of conveyor 29.

[0054] Depending on the specifications of the aggregate 19 supplied to the aggregate dryer 5, some of the aggregates 19A, 19B, 19C, 19D, 19E, 19F, 19G, and 19H may not be supplied to the conveyor 29. For example, aggregate 19B or aggregate 19E may not be supplied to the conveyor 29.

[0055] Furthermore, when supplying aggregate 19 to aggregate dryer 5 while changing the ratio and total amount of each of aggregates 19A, 19B, 19C, 19D, 19E, 19F, 19G, and 19H, aggregate 19 is temporarily removed from conveyor 29 to return to the initial state. Thereafter, supply of aggregate 19 to conveyor 29 is started as described above.

[0056] The aggregate conveying device 3 controls the multiple feeders 27 so that the amount of aggregate 19 dispensed from each of the multiple hoppers 25 reaches a target value, and adjusts the conveying speed of the aggregate 19 by the conveyor 29 according to the total amount (total quantity) of aggregate 19 dispensed from each of the multiple hoppers 25.

[0057] This prevents the conveyor 29 from wasting power, thereby minimizing the power consumption of the conveyor 29. In addition, the interval between maintenance of the cleaner 31 can be extended.

[0058] For example, suppose the cleaner 31 is configured to bring the scraper 35 into contact with the conveyor belt of the conveyor 29 to scrape off aggregate 19 adhering to the conveyor belt of the conveyor 29. In this case, the amount of wear on the scraper 35 can be reduced by slowing down the movement speed of the conveyor belt of the conveyor 29. This also makes it possible to extend the interval between maintenance of the cleaner 31. Note that the amount of wear on the conveyor belt of the conveyor 29 can also be reduced by slowing down the movement speed of the conveyor belt of the conveyor 29.

[0059] In addition, by slowing down the movement speed of the conveyor belt of the conveyor 29, the amount of work required to process the deposits (deposits formed by the falling of aggregate 19 that had been adhering to the conveyor belt of the conveyor 29) can be minimized.

[0060] Furthermore, the aggregate conveying device 3 can accurately adjust the composition ratio of each type of aggregate 19 conveyed by the conveyor 29. More specifically, the cleaner 31 removes aggregate 19 adhering to the conveying belt of the conveyor 29, so that the composition ratio of the aggregate 19 discharged from each hopper 25 onto the conveying belt free of excess aggregate 19 can be accurately adjusted.

[0061] In addition, in the aggregate conveying device 3, when the conveying speed of the conveyor 29 reaches the target value, the aggregate 19 begins to be dispensed onto the conveyor 29 in order from the hopper 25 located upstream in the conveying direction of the aggregate 19 on the conveyor 29 to the hopper 25 located downstream in the conveying direction of the aggregate 19 on the conveyor 29.

[0062] In addition, in the aggregate conveying device 3, the total amount of aggregate 19 dispensed from each of the multiple hoppers is set to a target amount at the hopper 25H located at the most downstream side in the conveying direction of the aggregate 19 on the conveyor 29.

[0063] As a result, even when conveying the aggregate 19 on the conveyor 29 starts, it is possible to convey the aggregate 19 having the target specifications, and to obtain an asphalt mixture having the target specifications.

[0064] In addition, in the asphalt plant 1, the mixer 15 mixes the asphalt pavement waste recycled by the recycle dryer 23 with aggregate 19 supplied from the hot bin 9, etc., to produce an asphalt mixture.

[0065] In addition, in the asphalt plant 1, the amount of aggregate 19 etc. supplied from the hot bin 9 relative to the amount of asphalt pavement waste recycled by the recycle dryer 23 supplied to the mixer 15 is a target value in the asphalt mixture specifications.

[0066] Furthermore, in the asphalt plant 1, the recycle dryer 23 recycles the waste asphalt pavement at or near the upper limit of the amount of recycle of the waste asphalt pavement in the recycle dryer 23 and supplies it to the mixer 15.

[0067] This allows the recycling dryer 23 to be used to efficiently utilize waste asphalt pavement materials.

[0068] In the above description, the conveying speed of the first aggregate conveyor 29 is changed depending on the amount of aggregate 19 being conveyed. Similarly, the conveying speeds of the second aggregate conveyor 41, the third aggregate conveyor 43, the first recycled pavement waste conveyor 51, and the second recycled pavement waste conveyor 53 may be changed. Furthermore, the second aggregate conveyor 41, the third aggregate conveyor 43, the first recycled pavement waste conveyor 51, and the second recycled pavement waste conveyor 53 may be provided with cleaners similar to the cleaner 31.

[0069] Incidentally, the above description may be understood as a method invention.

[0070] In other words, it may be understood as a method for transporting aggregate to be used in an asphalt mixture, comprising: an aggregate dispensing step of dispensing a target amount of aggregate onto a conveyor from each of a plurality of hoppers, each containing a different type of aggregate; an aggregate transporting step of adjusting the aggregate transport speed by the conveyor in accordance with the total amount of aggregate dispensed in the aggregate dispensing step and transporting the aggregate dispensed in the aggregate dispensing step; and a cleaning step of cleaning the portions of the conveyor that are not transporting aggregate (for example, the portions of the conveyor belt) by, for example, bringing a scraper into contact with the conveyor belt.

[0071] In this aggregate transport method, the multiple hoppers are arranged in a line in the direction in which the conveyor transports the aggregate, and the aggregate discharging process involves starting the conveyor from an initial state in which no aggregate is placed on the conveyor and the conveyor is stopped, and when the conveyor's transport speed reaches a target value (a target constant value), discharging of aggregate to the conveyor is started in order from the hopper and feeder among the multiple hoppers that are located upstream in the direction in which the conveyor transports the aggregate to the hopper and feeder among the multiple hoppers that are located downstream in the direction in which the conveyor transports the aggregate, so that the total amount (total quantity) of aggregate discharged from each of the multiple hoppers reaches the target amount at the hopper and feeder among the multiple hoppers that are located most downstream in the direction in which the conveyor transports the aggregate.

[0072] The method may also be understood as a method for producing an asphalt mixture comprising: an aggregate discharging process for discharging a target amount of aggregate onto a conveyor from each of a plurality of hoppers, each containing a different type of aggregate; an aggregate transporting process for adjusting the transport speed of the aggregate discharged from each of the plurality of hoppers and transported by the conveyor depending on the total amount of aggregate discharged in the aggregate discharging process; a cleaning process for cleaning portions of the conveyor that are not transporting aggregate; an aggregate drying process for drying the aggregate transported in the aggregate transporting process; a powder capturing process for capturing powder generated when drying the aggregate in the aggregate drying process; and an asphalt mixture producing process for producing an asphalt mixture by using a mixer to mix the powder captured by the powder capturing device, the aggregate dried in the aggregate drying process, stone powder supplied from a stone powder silo, and asphalt supplied from an asphalt tank.

[0073] In this asphalt mixture manufacturing method, the asphalt mixture generating step is a step of mixing, using the mixer, the asphalt pavement waste recycled by the recycle dryer, the powder captured in the powder capturing step, the aggregate dried in the aggregate drying step, the stone powder supplied from the stone powder silo, and the asphalt supplied from the asphalt tank, and the ratio of the powder captured in the powder capturing step to the mixer is 1 / 2 the amount of the asphalt pavement waste recycled by the recycle dryer supplied to the mixer. The amount of the aggregate dried in the aggregate drying process supplied to the mixer, the amount of stone powder supplied from the stone powder silo supplied to the mixer, and the amount of asphalt supplied from the asphalt tank to the mixer are all target values ​​in the specifications of the asphalt mixture, and the recycle dryer is configured to regenerate asphalt pavement waste at or near the upper limit of the amount of regenerated asphalt pavement waste in the recycle dryer, and to supply the entire amount of this regenerated asphalt pavement waste to the mixer.

[0074] Although the present embodiment has been described above, the present embodiment is not limited to this, and various modifications are possible within the scope of the gist of the present embodiment. [Explanation of symbols]

[0075] 1. Asphalt plant 3 Aggregate conveying equipment 5 Aggregate dryer 7 Powder capture device 9 Hot Bottle 11 Stone powder silo 13 Asphalt Tank 15 Mixer 19, 19A~19H Aggregate 23 Recycled Dryer 25, 25A~25H Hopper 27, 27A~27H Feeder 29 Conveyor 35 Cleaner 33 Control Unit

Claims

1. a plurality of hoppers each containing a different type of aggregate; a plurality of feeders each provided in each of the plurality of hoppers, the feeders being capable of adjusting the amount of aggregate discharged from each of the plurality of hoppers; a conveyor that transports the aggregate discharged from the plurality of hoppers by the plurality of feeders to an aggregate dryer; a cleaner for cleaning the conveyor; a control unit that controls the plurality of feeders so that the amount of aggregate discharged from each of the plurality of hoppers becomes a target value, and that controls the conveyor so as to adjust the conveying speed of the aggregate in accordance with the total amount of aggregate discharged from each of the plurality of hoppers; and the plurality of hoppers and the plurality of feeders are arranged side by side in a conveying direction of the aggregate by the conveyor, The control unit When no aggregate is placed on the conveyor and the conveying speed of the conveyor is at a target value, start discharging the aggregate to the conveyor in order from a hopper located upstream in the conveying direction of the aggregate on the conveyor among the plurality of hoppers to a hopper located downstream in the conveying direction of the aggregate on the conveyor among the plurality of hoppers; An aggregate conveying device for asphalt mixtures that controls the multiple feeders so that the total amount of aggregate dispensed from each of the multiple hoppers reaches a target amount at the hopper located furthest downstream in the aggregate conveying direction on the conveyor.

2. An aggregate conveying device according to claim 1; the aggregate dryer that dries the aggregate transported by the conveyor; a powder capturing device that captures powder coming out of the aggregate dryer when the aggregate is being dried by the aggregate dryer; a hot bin for storing the aggregate dried by the aggregate dryer; A stone powder silo for storing stone powder; an asphalt tank for storing asphalt; a mixer that generates an asphalt mixture by mixing the powder captured by the powder capturing device, the aggregate supplied from the hot bin, the stone powder supplied from the stone powder silo, and the asphalt supplied from the asphalt tank; Asphalt plant having:

3. A plurality of hoppers each containing a different type of aggregate; a plurality of feeders each provided in each of the plurality of hoppers, the feeders being capable of adjusting the amount of aggregate discharged from each of the plurality of hoppers; a conveyor that transports the aggregate discharged from the plurality of hoppers by the plurality of feeders to an aggregate dryer; a cleaner for cleaning the conveyor; a control unit that controls the plurality of feeders so that the amount of aggregate discharged from each of the plurality of hoppers becomes a target value, and that controls the conveyor so as to adjust the conveying speed of the aggregate in accordance with the total amount of aggregate discharged from each of the plurality of hoppers; an aggregate conveying device having the aggregate dryer that dries the aggregate transported by the conveyor; a powder capturing device that captures powder coming out of the aggregate dryer when the aggregate is being dried by the aggregate dryer; a hot bin for storing the aggregate dried by the aggregate dryer; A stone powder silo for storing stone powder; an asphalt tank for storing asphalt; a mixer that generates an asphalt mixture by mixing the powder captured by the powder capturing device, the aggregate supplied from the hot bin, the stone powder supplied from the stone powder silo, and the asphalt supplied from the asphalt tank; and It has a recycling dryer that recycles asphalt pavement waste, The mixer is configured to generate an asphalt mixture by mixing the asphalt pavement waste recycled by the recycle dryer with the powder captured by the powder capture device, aggregate supplied from the hot bin, stone powder supplied from the stone powder silo, and asphalt supplied from the asphalt tank, the amounts of the powder captured by the powder capturing device, the aggregate supplied from the hot bin, the stone powder supplied from the stone powder silo, and the asphalt supplied from the asphalt tank relative to the amount of asphalt pavement waste recycled by the recycle dryer supplied to the mixer are set to target values ​​in the specifications of the asphalt mixture; The asphalt plant is configured such that the recycle dryer regenerates asphalt pavement waste at or near the upper limit of the amount of regenerated asphalt pavement waste in the recycle dryer and supplies the regenerated asphalt pavement waste to the mixer.

4. A plurality of hoppers each containing a different type of aggregate; a plurality of feeders each provided in each of the plurality of hoppers, the feeders being capable of adjusting the amount of aggregate discharged from each of the plurality of hoppers; a conveyor that transports the aggregate discharged from the plurality of hoppers by the plurality of feeders to an aggregate dryer; a cleaner for cleaning the conveyor; a control unit that controls the plurality of feeders so that the amount of aggregate discharged from each of the plurality of hoppers becomes a target value, and that controls the conveyor so as to adjust the conveying speed of the aggregate in accordance with the total amount of aggregate discharged from each of the plurality of hoppers; and the plurality of hoppers and the plurality of feeders are arranged side by side in a conveying direction of the aggregate by the conveyor, The control unit When no aggregate is placed on the conveyor and the conveying speed of the conveyor is at a target value, start discharging the aggregate to the conveyor in order from a hopper located upstream in the conveying direction of the aggregate on the conveyor among the plurality of hoppers to a hopper located downstream in the conveying direction of the aggregate on the conveyor among the plurality of hoppers; An aggregate conveying device for asphalt mixture that controls the plurality of feeders so that the total amount of aggregate discharged from each of the plurality of hoppers becomes a target amount at the hopper located most downstream in the aggregate conveying direction of the conveyor. the aggregate dryer that dries the aggregate transported by the conveyor; a powder capturing device that captures powder coming out of the aggregate dryer when the aggregate is being dried by the aggregate dryer; a hot bin for storing the aggregate dried by the aggregate dryer; A stone powder silo for storing stone powder; an asphalt tank for storing asphalt; a mixer that generates an asphalt mixture by mixing the powder captured by the powder capturing device, the aggregate supplied from the hot bin, the stone powder supplied from the stone powder silo, and the asphalt supplied from the asphalt tank; and It has a recycling dryer that recycles asphalt pavement waste, The mixer is configured to generate an asphalt mixture by mixing the asphalt pavement waste recycled by the recycle dryer with the powder captured by the powder capture device, aggregate supplied from the hot bin, stone powder supplied from the stone powder silo, and asphalt supplied from the asphalt tank, the amounts of the powder captured by the powder capturing device, the aggregate supplied from the hot bin, the stone powder supplied from the stone powder silo, and the asphalt supplied from the asphalt tank relative to the amount of asphalt pavement waste recycled by the recycle dryer supplied to the mixer are set to target values ​​in the specifications of the asphalt mixture; The asphalt plant is configured such that the recycle dryer regenerates asphalt pavement waste at or near the upper limit of the amount of regenerated asphalt pavement waste in the recycle dryer and supplies the regenerated asphalt pavement waste to the mixer.

5. an aggregate discharging step of discharging a target amount of aggregate from each of a plurality of hoppers containing different types of aggregate onto a conveyor; an aggregate transporting step of adjusting a transporting speed of the aggregate discharged from each of the plurality of hoppers and transported by the conveyor in accordance with a total amount of the aggregate discharged in the aggregate discharging step; a cleaning step of cleaning the conveyor; an aggregate drying step of drying the aggregate transported in the aggregate transport step; a powder capturing step of capturing powder generated when drying the aggregate in the aggregate drying step; an asphalt mixture production process in which the powder captured by the powder capturing device, the aggregate dried in the aggregate drying process, stone powder supplied from a stone powder silo, and asphalt supplied from an asphalt tank are mixed together using a mixer to produce an asphalt mixture; and The asphalt mixture producing step is a step of mixing, using the mixer, the asphalt pavement waste recycled by the recycle dryer, the powder captured in the powder capturing step, the aggregate dried in the aggregate drying step, the stone powder supplied from the stone powder silo, and the asphalt supplied from the asphalt tank; the amount of powder captured in the powder capturing step, the amount of aggregate dried in the aggregate drying step, the amount of stone powder supplied from the stone powder silo to the mixer, and the amount of asphalt supplied from the asphalt tank to the mixer, all meet target values ​​in the specifications of the asphalt mixture, relative to the amount of asphalt pavement waste recycled by the recycle dryer supplied to the mixer; The method for producing an asphalt mixture, wherein the recycle dryer regenerates asphalt pavement waste at or near the upper limit of the amount of regenerated asphalt pavement waste in the recycle dryer, and supplies the entire amount of the regenerated asphalt pavement waste to the mixer.

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