JP7017834B2 - How to display the amount of aggregate stored in the aggregate storage bottle of an asphalt plant - Google Patents

Description

The present invention relates to a method for displaying an aggregate storage amount in an aggregate storage bottle of a plant body of an asphalt plant.

Conventionally, in an asphalt plant, aggregates are cut out at a desired ratio from a plurality of aggregate hoppers that store various aggregates for each type, heated by a dryer, which is a heating device, and then placed on a vibrating sieve at the top of the plant body. It is sieved according to the particle size and stored in each compartment of the lower aggregate storage bin according to the particle size. Then, aggregates of each particle size are discharged from each of the compartments according to the composition of the asphalt mixture to be manufactured, weighed in a predetermined amount in a lower measuring tank, and then mixed with other materials such as asphalt by a mixer. Manufactures the desired asphalt mixture.

At this time, the plant operator, based on the aggregate storage amount (remaining amount) in each compartment and the shipping plan of the asphalt mixture, takes care not to cause the aggregate to run out or overflow during operation, and the respective bones. It is necessary to appropriately cut out the aggregate from the material hopper and supply it. However, since the aggregate cut out from each of the aggregate hoppers is supplied to each of the compartments after being sieved with a vibrating sieve as described above, it is necessary to accurately grasp the amount of aggregate stored in each compartment. Conventionally, for example, paddle-type level switches are provided in the upper and lower parts of each compartment, and the excess or deficiency of the amount of aggregate is determined according to the detection / non-detection of each level switch, and each aggregate is correspondingly determined. I try to cut out the aggregate from the hopper.

In addition, a continuous level sensor is installed in each compartment to detect the real-time aggregate storage amount in each compartment, and the appropriate amount of aggregate corresponding to the blending and shipping amount of the asphalt mixture to be shipped according to it. There is also a proposal to supply the same amount to each compartment (see Patent Documents 1 and 2).

Japanese Unexamined Patent Publication No. 8-170304 Japanese Unexamined Patent Publication No. 8-170305

However, the continuous level sensor may cause a measurement error in an atmosphere filled with dust, water vapor, etc. like an aggregate storage bottle, and may not be able to stably and accurately detect the amount of aggregate storage. .. It is also conceivable to install a large number of the paddle-type level switches that are not easily affected by dust, water vapor, etc. at predetermined intervals in the vertical direction of each compartment, but even in this case, the amount of aggregate stored is gradually increased. Since it can only be detected (discontinuously), it is still not possible to grasp the amount of aggregate stored in real time.

In view of the above points, the present invention makes it possible to display the real-time aggregate storage amount in each compartment of the aggregate storage bin, and accordingly, an appropriate amount of bone corresponding to the composition and shipment amount of the asphalt mixture to be shipped. An object of the present invention is to provide a method for displaying the amount of aggregated material stored in an aggregated material storage bin of an asphalt plant so that the material can be supplied in just proportion.

In order to solve the above problems, in the method for displaying the amount of aggregate stored in the aggregate storage bin of the asphalt plant according to claim 1 of the present invention, a plurality of aggregate hoppers for storing each type of aggregate are used as feeders. A predetermined amount of aggregate is cut out, heated with a dryer, sieved for each particle size with a vibrating sieve, stored in a plurality of compartments of the aggregate storage bin according to the particle size, and each particle size discharged from each compartment is stored. In an asphalt plant where a predetermined amount of aggregate is weighed in a measuring tank and mixed with asphalt or the like in a mixer to produce an asphalt mixture, the operation panel of the plant has an aggregate type stored in each aggregate hopper. A sieving ratio table is registered in which the ratio of sieving to each of the compartments is set when each is subjected to the vibration sieving. Sieving ratio Multiply by the sieving ratio of the same aggregate type in the table, sum the results of each multiplication for each compartment to obtain the aggregate input amount for each compartment, and then use this aggregate input amount. The amount of aggregate discharged from each section is subtracted to obtain the real-time aggregate storage amount of each section, and the amount of aggregate stored obtained by this calculation is displayed on the display screen of the operation panel and each section. A paddle type level switch is provided at a predetermined position in the drawing room, and the actual aggregate storage amount at the time of detecting the aggregate of the paddle type level switch is obtained in advance and registered in the operation panel as the set aggregate storage amount. When the paddle type level switch detects the aggregate, the aggregate storage amount obtained by calculation is corrected to the set aggregate storage amount .

Further, in the method for displaying the amount of aggregated material stored in the aggregated material storage bin of the asphalt plant according to claim 2 , the total amount of aggregate discharged for each sectioned room discharged from each sectioned room during the operation of the plant for one day and the end of operation. Occasionally, the amount of residual aggregate remaining in each compartment was summed up to obtain the actual total aggregate input amount for each compartment, and the actual total aggregate input amount and the aggregate calculated for each compartment were calculated. The total amount of aggregate input, which is the total amount of input for one day, is compared with each compartment to obtain the error ratio for each compartment. It is characterized in that the sieving ratio of the aggregate type is manually or automatically multiplied by a predetermined correction coefficient according to the error ratio to correct the sieving ratio.

According to the method for displaying the amount of aggregate stored in the aggregate storage bin of the asphalt plant according to claim 1 of the present invention, the operation panel of the plant is subjected to a vibrating sieve for each type of aggregate stored in each aggregate hopper. Occasionally, a sieving ratio table is registered in which the ratio of sieving to each compartment of the aggregate storage bin is set. Multiply by the sieving ratio of the same aggregate type in the table, and sum the results of each multiplication for each compartment to obtain the aggregate input amount for each compartment. The real-time aggregate storage amount of each compartment is obtained by subtracting the aggregate discharge amount from each, and the aggregate storage amount obtained by this calculation is displayed on the display screen of the operation panel, and the predetermined amount of each compartment is specified. A paddle type level switch is provided at the position, and the actual aggregate storage amount at the time of detecting the aggregate of the paddle type level switch is obtained in advance and registered in the operation panel as the set aggregate storage amount, and the paddle type level is used. When the switch detects the aggregate, the calculated aggregate storage amount is corrected to the set aggregate storage amount, so that the plant operator can grasp the real-time aggregate storage amount in each section of the aggregate storage bin. Therefore, it is possible to supply an appropriate amount of aggregate according to the composition and shipment amount of the asphalt mixture to be shipped without excess or deficiency. As a result, it is possible to prevent problems such as running out of aggregate and overflow during plant operation, and it is possible to operate the plant with a margin according to the shipping plan, and it is possible to reduce the burden on the operator. In addition, the amount of unused residual aggregate in each compartment at the end of operation can be suppressed, and the effect of reducing troublesome extraction work and wasted heat energy can be expected.

In addition , even if an error occurs in the amount of aggregate stored in each compartment calculated by calculation during plant operation, it can be corrected to the appropriate value obtained in advance each time the paddle type level switch detects aggregate. A more appropriate aggregate storage amount with less error can be displayed on the display screen of the operation panel.

Further, according to the method for displaying the amount of aggregated material stored in the aggregated material storage bin of the asphalt plant according to claim 2 , the total amount of aggregate discharged for each sectioned room discharged from each sectioned room during the operation of the plant for one day is used. The actual total aggregate input amount for each compartment was obtained by totaling the amount of residual aggregate remaining in each compartment at the end of the operation, and the actual total aggregate input amount and the above-mentioned for each compartment obtained by calculation. The total amount of aggregate input, which is the total amount for one day, is compared with the total amount of aggregate input for each compartment to obtain the error ratio for each compartment. Since the sieving ratio of the high-weighted aggregate is manually or automatically multiplied by a predetermined correction coefficient according to the error ratio, the sieving ratio, which is the basis for calculating the amount of aggregate stored, is used for plant operation. It can be updated daily based on the actual results, which can reduce errors due to changes in the particle size of each aggregate type stored in each aggregate hopper and the influence of clogging of the vibrating sieve, etc., and can be displayed on the display screen of the operation panel. Can display a more appropriate amount of aggregate storage with less error.

It is explanatory drawing which shows the schematic structure of the asphalt plant which adopts the aggregate storage amount display method of the aggregate storage bottle which concerns on this invention. It is a flowchart 1 which shows the display procedure of the aggregate storage amount of the aggregate storage bottle which concerns on this invention. It is a flowchart 2 which shows the display procedure of the aggregate storage amount of the aggregate storage bottle which concerns on this invention. It is a figure which shows the display screen of the operation panel in the state which the sieving ratio table is displayed. It is an enlarged view of a part cutout main part of an aggregate storage bottle. It is a figure which shows the display screen of the operation panel in the state which displayed the aggregate storage amount of each section chamber of the aggregate storage bin. It is a figure which shows the display screen of the operation panel in the state which displayed the data of the error ratio between the actual aggregate input amount and the calculated value of each section room. It is a figure corresponding to FIG. 4 in the state which corrected by multiplying the sieving ratio table by the correction coefficient.

In the method for displaying the amount of aggregate stored in the aggregate storage bin of the asphalt plant according to the present invention, the operation panel of the asphalt plant is subjected to a vibrating sieve of the plant body for each type of aggregate stored in a plurality of aggregate hoppers. Register a sieving ratio table that sets the ratio of sieving to each compartment of the aggregate storage bin at the time. In the sieving ratio table, for example, when one type of aggregate is cut out from each of the aggregate hoppers, it is determined in advance by a test or the like which section chamber and what ratio the aggregate can be sieved. It is created based on the results of performing it over all aggregate types.

Then, at the time of plant operation, first, the amount of cut out for each aggregate type cut out from each aggregate hopper is multiplied by the sieving ratio of the same aggregate type in the sieving ratio table, and each multiplication result is divided into sections. The aggregate input amount for each compartment is calculated by totaling for each room. Next, the amount of aggregate discharged from each compartment (actual measurement value in the measuring tank) is subtracted from the amount of aggregate input to obtain the real-time aggregate storage amount of each compartment. Then, the aggregate storage amount of each compartment obtained by this calculation is displayed on the display screen of the operation panel, for example, as a tonnage or a ratio (%) to the capacity of the compartment.

Further, preferably, a paddle type level switch that is not easily affected by dust, water vapor, etc. is provided at a predetermined position in each compartment of the aggregate storage bin, and the actual aggregate storage amount at the time of detecting the aggregate of the paddle type level switch can be determined. It is obtained in advance by a test or the like and registered in the operation panel as the set aggregate storage amount. Then, when the paddle type level switch detects the aggregate during the plant operation, the calculated aggregate storage amount is corrected to the set aggregate storage amount, and this correction is made on the display screen of the operation panel. Display the amount of aggregate stored later. As a result, even if an error occurs in the aggregate storage amount obtained by calculation, it can be corrected to an appropriate value each time the paddle type level switch detects the aggregate, and a more appropriate aggregate storage amount with less error is displayed. can.

The installation position of the paddle type level switch is not particularly limited, but if it is installed at a substantially intermediate height position of each compartment, for example, the paddle type level switch frequently detects aggregate during plant operation. It is preferable that the amount of aggregate stored can be corrected to an appropriate value each time. Further, it is preferable to install a plurality of paddle type level switches at different installation heights in each compartment because the correction frequency can be further increased.

Further, preferably, the total amount of aggregate discharged from each of the compartments during the operation of the plant for one day and the amount of residual aggregate left unused in each of the compartments at the end of the operation are respectively. In total, the total amount of aggregate input for each compartment is calculated. Next, the actual total aggregate input amount and the total aggregate input amount, which is the total amount for one day of the aggregate input amount for each compartment calculated by calculation, are compared for each compartment, and these measured values are used. Find the error ratio with the calculated value. Then, when the error ratio is equal to or higher than a predetermined ratio (in some cases, if there is even a slight error), the error is manually or automatically with respect to the sieving ratio of the aggregate type having a high ratio of sieving to each compartment. Correct by multiplying by a predetermined correction coefficient according to the ratio.

As a result, the sieving ratio, which is the basis for calculating the amount of aggregate stored in each compartment, can be updated daily based on the operation results of the plant. It is possible to effectively reduce the error due to the influence of clogging, etc., and it is possible to display a more appropriate aggregate storage amount with less error.

As the correction coefficient, the daily error ratio may be used as the correction coefficient as it is (for example, if the calculated value is 5% less than the measured value, the correction coefficient is 1.05 for the sieving ratio of the predetermined aggregate type. If the value of the error ratio fluctuates greatly every day, for example, the average value of the error ratio for the last few days may be taken and used as the correction coefficient. .. Further, the sieving ratio table may be displayed on the display screen of the operation panel, and the plant operator may directly input the correction coefficient on the display screen to correct the sieving ratio table.

As described above, according to the method for displaying the amount of aggregate stored in the aggregate storage bin of the asphalt plant of the present invention, the plant operator can store the aggregate in real time in each section of the aggregate storage bin via the display screen of the operation panel. The amount can be grasped, and the appropriate amount of aggregate according to the shipping plan can be supplied and replenished without delay and without excess or deficiency. As a result, it is possible to prevent problems such as running out of aggregate and overflow during operation, reduce the amount of residual aggregate at the end of operation, and operate the plant with a margin as planned, reducing the burden on the operator. Can contribute.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

1a to 1d in the figure are aggregate hoppers, and for example, aggregates such as sand, No. 7 crushed stone, No. 6 crushed stone, and No. 5 crushed stone are stored for each type. Then, the aggregate is cut out at a predetermined ratio by the variable speed feeders 2a to 2d provided in the lower portions of the aggregate hoppers 1a to 1d, and the aggregate is put into the dryer 4 which is an aggregate heating device via the conveyor 3, and the inside of the dryer 4 is filled. While passing through, the temperature is raised to a predetermined temperature by hot air from the burner 5.

The heated aggregate is lifted to the upper part of the plant main body 7 by the bucket elevator 6, sieved according to the particle size by the vibrating sieve 8, and stored in the plurality of compartments 9a to 9d of the aggregate storage bin 9 according to the particle size. Then, the aggregate of each particle size discharged from the discharge gate 10 at the lower part of each of the compartments 9a to 9d is cumulatively weighed in a predetermined amount in the lower measuring tank 11 and mixed with a predetermined amount of asphalt, stone powder, etc. in the mixer 12. To produce an asphalt mixture having a desired composition.

Further, the measuring tank 11 is provided with a load cell 13 which is a measuring means, and a paddle type level switch which is an aggregate detecting means is provided at a substantially intermediate height position of each of the compartments 9a to 9d of the aggregate storage bin 9. Each of 14a to 14d is provided.

Reference numeral 15 in the figure is an operation panel for plant control, and the operation panel 15 includes control signals to various devices of the plant, measurement value data from the load cell 13, and paddle type level switches 14a to 14d. When the input / output unit 16 for inputting / outputting the aggregate detection signal and the like, the composition of each type of asphalt mixture, and the aggregate type stored in each of the aggregate hoppers 1a to 1d are subjected to the vibration sieve 8. A sieving ratio table in which the ratio of sieving to each of the compartments 9a to 9d is set, a set aggregate storage amount which is the actual aggregate storage amount when the aggregate is detected by the paddle type level switches 14a to 14d, and the like are stored and stored. Storage unit 17, calculation unit 18 that calculates the real-time aggregate storage amount of each compartment 9a to 9d based on the amount of aggregate cut out from each of the aggregate hoppers 1a to 1d and the sieving ratio table, etc. A setting input unit 19 for inputting and setting data, a display unit 20 for displaying the real-time aggregate storage amount of each of the compartments 9a to 9d calculated by the calculation unit 18, a control unit 21 for controlling each unit, and the like. It is equipped with.

Next, a procedure for displaying the real-time aggregate storage amount of each of the compartments 9a to 9d of the aggregate storage bin 9 during plant operation will be described based on the flowcharts of FIGS. 2 to 3. Note that S1, S2, ... In the figure represent each step.

First, when one type of aggregate is cut out from each of the aggregate hoppers 1a to 1d, the ratio (%) of which compartments 9a to 9d can be sieved is determined by a test or the like. Based on the results of the above, for example, a sieving ratio table A as shown in FIG. 4 is prepared. In FIG. 4, the hoppers 1, hoppers 2, ... Represent the aggregate hoppers 1a, 1b, ..., And AG1, AG2, ... Represent the compartments 9a, 9b, .... Then, as an initial setting before starting the operation of the plant, the sieving ratio table A is set and registered in the storage unit 17 of the operation panel 15 (S1).

Further, when the aggregate storage amount is corrected during the plant operation, the set aggregate storage amount, which is the aggregate storage amount at the time of detecting each of the paddle type level switches 14a to 14d, is set for each compartment 9a to 9d. Register (S2). As the set aggregate storage amount, the actual aggregate storage amount when the aggregate is detected by the paddle type level switches 14a to 14d may be obtained in advance by a test or the like. Then, it is determined whether or not to end the initial setting (S3), and if it is completed, the process proceeds to END to end the setting operation, and if it is to be continued, the process returns to step S1 to perform the setting work.

Then, at the time of plant operation, the variety, composition, and shipping amount of the asphalt mixture to be shipped, which are input in advance, are read (S4), and the amount of aggregate corresponding to the variety is read from each of the aggregate hoppers 1a to 1d in a predetermined amount. Cut out (S5). Next, the sieving ratio table A is read (S6), the amount of cut out for each aggregate type cut out from each of the aggregate hoppers 1a to 1d, and the sieving ratio of the same aggregate type in the sieving ratio table A. And each are multiplied (S7). For example, if the amount of sand cut out is 4 tons, multiplying by the sieving ratio of hopper 1 (sand) in the sieving ratio table A in FIG. The chamber 9c (AG3) and the compartment 9d (AG4) are sieved by 3648 kg, 352 kg, 0 kg, and 0 kg, respectively, and these are the remaining aggregate types, hopper 2 (crushed stone No. 7) and hopper 3. (No. 6 crushed stone) and Hopper 4 (No. 5 crushed stone) are also multiplied in the same manner.

Next, the multiplication results are totaled for each compartment to obtain the aggregate input amount for each compartment (S8). For example, if the amount of sand, No. 7 crushed stone, No. 6 crushed stone, and No. 5 crushed stone cut out is 4 tons each, the total value of 3648 kg, 208 kg, 280 kg, and 160 kg in the compartment 9a (AG1) is 4296 kg (about). 4.3t) of aggregate will be charged, and when this is calculated in the same way for the remaining compartments, about 4.0t in the compartment 9b (AG2) and about 4.0t in the compartment 9c (AG3). Approximately 3.8 tons of aggregate will be charged into the 3.9 t and the compartment 9d (AG4). Next, if there is an aggregate discharge from each of the compartments 9a to 9d, the amount of aggregate discharge (actual measurement value taken from the load cell 13) is subtracted from the amount of aggregate input, and the real time of each compartment 9a to 9d is subtracted. Obtain the amount of aggregate stored (S9).

Further, when the aggregate storage amount obtained by the calculation is corrected by the detection of the aggregate by the paddle type level switches 14a to 14d, whether or not the paddle type level switches 14a to 14d have detected the aggregate. (S10), and if detected, the preset aggregate storage amount is read (S11), and the calculated aggregate storage amount is corrected to the set aggregate storage amount (S12). If it is not detected, the process proceeds to the next step S13 without correcting the calculated value. If the calculation value is highly accurate and does not need to be corrected, steps S10 to S12 surrounded by the alternate long and short dash line may be omitted.

Further, as shown in FIG. 5A, the paddle type level switches 14a to 14d are paddle portions that are rotated by a motor drive when the aggregate level represented by the alternate long and short dash line rises to the solid line position. 22 receives resistance and stops rotating, which triggers the transmission of a detection signal. On the other hand, as shown in FIG. 5B, when the lower discharge gate 10 is opened and the aggregate level represented by the alternate long and short dash line drops to the solid line position, the resistance disappears and the paddle portion 22 rotates. However, since the aggregate storage amount at that time is slightly different from that in (a) as shown in the figure, the detection signal is not transmitted at that timing and the correction is not performed.

Further, 23 in FIG. 5 is a substantially umbrella-shaped cover body that protects the aggregate falling from the upper vibrating sieve 8 from directly hitting the paddle portions 22 of the paddle type level switches 14a to 14d and being damaged. However, when the aggregate is discharged, a bridge may be formed between the cover body 23 and the inner walls of the compartments 9a to 9d, and a gap may be temporarily formed around the paddle portion 22 located directly under the cover body 23. be. The void disappears as soon as the bridge collapses with the discharge of the aggregate, but if the paddle type level switches 14a to 14d detect the aggregate at that time, there is a possibility that the correction is erroneously performed. Therefore, even when the paddle type level switches 14a to 14d detect the aggregate, the correction is not immediately executed, the timer waits for a predetermined time (for example, about 20 to 30 seconds), and the detection signal is detected even after the predetermined time has elapsed. It is preferable to execute the correction only when the transmission is continued because the correction accuracy can be improved.

Then, the real-time aggregate storage amount of each of the compartments 9a to 9d obtained by the series of operations is displayed on the display unit 20 which is the display screen of the operation panel 15, for example, the tonnage and each compartment, as shown in FIG. The ratio (%) to the capacity is displayed numerically or graphically (S13). Then, it is determined whether or not to end the operation (S14), and if it is continued, the process returns to step S4 to continue the operation. At this time, the plant operator can grasp the real-time aggregate storage amount in each of the compartments 9a to 9d of the aggregate storage bin 9 through the display screen of the operation panel 15, and this and the next shipment scheduled to be read in step S4. Based on the blending and shipping amount of the asphalt mixture, in step S5, an appropriate amount of aggregate is supplied and replenished from each of the aggregate hoppers 1a to 1d as needed. On the other hand, if end is selected in step S14, it is confirmed whether or not there is residual aggregate left unused in each of the compartments 9a to 9d (S15), and if there is residual aggregate, each of the compartments 9a to 9d. After removing the residual aggregate (S16), the process proceeds to END and the operation is terminated.

Further, preferably, after the end of the operation of the plant, the total amount of aggregate discharged and the amount of residual aggregate (in step S16) for each of the compartments 9a to 9d discharged from the compartments 9a to 9d during the operation of the plant for one day. (Weighed in the measuring tank 11 at the time of extraction), and the actual total aggregate input amount for each of the compartments 9a to 9d is obtained (S17). Next, the actual total aggregate input amount and the total aggregate input amount, which is the total daily amount of the aggregate input amount for each of the compartments 9a to 9d calculated by calculation, are compared for each compartment 9a to 9d. Then, the error ratio between the measured value and the calculated value is obtained (S18). Then, it is determined whether the error ratio is equal to or higher than the preset predetermined ratio (S19), and if the error ratio is equal to or higher than the predetermined ratio (in some cases, if there is even a slight error), the bones having a high ratio of being screened into the respective compartments 9a to 9d. The sieving ratio of the grade is manually or automatically multiplied by a correction coefficient according to the error ratio to correct (S20). The aggregate type to be corrected may be only the aggregate type having the highest ratio of sifting, or may be performed for a plurality of types from the one having the highest ratio of sifting.

Since a plurality of types of aggregates cut out from the plurality of aggregate hoppers 1a to 1d are screened in each of the compartments 9a to 9d, for example, the measured value and the calculated value of the amount of aggregate input in each of the compartments 9a to 9d. Even if the error ratio is known, it is not possible to accurately determine to what extent the sieving error of which aggregate type has an effect. Therefore, as described above, the sieving ratio of the aggregate species having a low ratio (less influence) to be screened into each of the compartments 9a to 9d is intentionally ignored, and the sieving ratio of the aggregate type having a high ratio to be screened (high influence). Is corrected by multiplying it by a predetermined correction coefficient.

FIG. 7 is data showing the error ratio between the daily measured value and the calculated value of the compartment 9a (AG1). For example, when the data for July 3 is explained, the total aggregate discharge amount is shown in the table. The total weight of the aggregate is 157174 kg, the actual residual aggregate amount is 1183 kg of the remaining amount of the storage bottle in the table, and the actual total aggregate input amount is 158357 kg, which is the total value of these. Further, the total aggregate input amount obtained by the calculation is 169863 kg, which is the sum of the calculated values of the remaining amount of the storage bin and the total measured values in the table. The error between these measured values and the calculated value is 11506 kg, which is represented by the difference in the remaining amount in the table, and this is divided by the actual total aggregate input amount to be an error ratio of about 7% (the calculated value is actually measured). (Approximately 7% more than the value) is calculated and displayed.

Next, the aggregate species having a high ratio of being sifted to the compartment 9a (AG1), in this case, from the sieving ratio table A in FIG. Correspondingly, for example, 0.93 (1-0.07 = 0.93) is multiplied as a correction coefficient, and the calculated value is corrected so as to be close to the measured value. Then, the remaining compartments 9b to 9d are also corrected in the same manner, and updated to, for example, a new sieving ratio table A'as shown in FIG. As a result, the sieving ratio, which is the basis for calculating the amount of aggregate stored in each compartment 9a to 9d, can be updated daily based on the operation results of the plant. Even if the aggregate of the same aggregate type is cut out due to fluctuations in the particle size of each type of aggregate to be stored or clogging of the vibrating sieve 8, it is sieved to each compartment 9a to 9d in the same manner as the previous day. Even if it is not divided, the display unit 20 of the operation panel 15 can display an appropriate amount of aggregate stored with little error. If there is no particular need to correct the sieving ratio table as described above, steps S17 to S20 surrounded by the alternate long and short dash line may be omitted.

Further, after displaying both the sieving ratio table A shown in FIG. 4 and the daily plant operation data shown in FIG. 7 on the display unit 20 of the operation panel 15, the plant operator displays the error ratio in the plant operation data. The correction coefficient may be appropriately determined based on the above, and the sieving ratio table A on the display screen may be directly corrected. However, a series of these corrections may be automatically performed by the calculation unit 18. ..

INDUSTRIAL APPLICABILITY The present invention can be widely used when displaying the amount of aggregate stored in an aggregate storage bottle of an asphalt plant.

1a-1d ... Aggregate hopper 2a-2d ... Feeder 4 ... Dryer 7 ... Plant body 8 ... Vibration sieve 9 ... Aggregate storage bin 9a-9d ... Partition room (aggregate storage bin)
11 ... Measuring tank 12 ... Mixer 14a-14d ... Paddle type level switch 15 ... Operation panel 20 ... Display unit (display screen)
A, A'... Sieving ratio table

Claims (2)

A predetermined amount of aggregate is cut out from multiple aggregate hoppers that store aggregate for each type with a feeder, and after heating with a dryer, it is sieved by particle size with a vibrating sieve to multiple compartments of the aggregate storage bin. In an asphalt plant where a predetermined amount of aggregate of each particle size discharged from each compartment is weighed in a measuring tank and mixed with asphalt or the like with a mixer to produce an asphalt mixture. In the operation panel of the above, a sieving ratio table is registered in which the ratio of sieving to each of the compartments is set for each aggregate type stored in each of the aggregate hoppers, and the above is first performed during plant operation. The amount of each aggregate cut out from each aggregate hopper is multiplied by the sieving ratio of the same aggregate type in the sieving ratio table, and the results of each multiplication are totaled for each section. The amount of aggregate input for each drawing room was obtained, and then the amount of aggregate discharged from each of the compartments was subtracted from the amount of aggregate input to obtain the real-time aggregate storage amount of each compartment, and the aggregate obtained by this calculation was obtained. The storage amount is displayed on the display screen of the operation panel, and a paddle type level switch is provided at a predetermined position in each of the compartments, and the actual aggregate storage amount at the time of detecting the aggregate of the paddle type level switch is obtained in advance. The feature is that the set aggregate storage amount is registered in the operation panel, and when the paddle type level switch detects the aggregate, the calculated aggregate storage amount is corrected to the set aggregate storage amount. How to display the amount of aggregate stored in the aggregate storage bin of the asphalt plant. The total amount of aggregate discharged from each compartment during the operation of the plant for one day and the amount of residual aggregate remaining in each compartment at the end of the operation are totaled and the actual total for each compartment. The amount of aggregate input was calculated, and the actual total amount of aggregate input was compared with the total amount of aggregate input, which is the total amount of the aggregate input for each day, for each compartment. When the error ratio is greater than or equal to the predetermined ratio, the predetermined ratio according to the error ratio is manually or automatically with respect to the sieving ratio of the aggregate type having a high ratio of being sieved to each compartment. The method for displaying an aggregate storage amount in an aggregate storage bin of an asphalt plant according to claim 1 , wherein the correction is made by multiplying by a correction coefficient.

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