JPH0647074B2 - Granule supply control device - Google Patents

Description

[Field of Industrial Application] The present invention relates to a granular material supply for controlling the supply amount of granular materials having different particle sizes such as aggregates used for obtaining a mixture in an asphalt plant, for example. The present invention relates to a control device.

[Prior Art] For example, in an asphalt plant, an aggregate, a filler, and an asphalt are mixed in predetermined amounts to obtain a mixture. To further explain, in obtaining this composite material, first, by controlling a plurality of transport feeders arranged for each grain size of the aggregate, a predetermined amount of the aggregate having a desired grain size is transported to a dryer and dried and heated. . The dried aggregate is conveyed to a sorting device and again divided into particles each having a predetermined particle size, and once the storage pins are stored and weighed, the gates of the storage bins are controlled so that the required amount of aggregate is collected. It is dropped into a mixer and mixed with filler and asphalt.

[Problems to be Solved by the Invention] By the way, in the course of obtaining a mixture as described above, when the amount of only the aggregate of a certain grain size stored in the storage bin is extremely reduced, the storage is controlled by the transport feeder. Although the required amount of aggregate is additionally supplied to the bin, the inflow amount of aggregate supplied to the storage bin is sparse depending on the operator who operates the transport feeder, and there is individual difference, so a stable inflow There was a problem that I could not get.

Further, since the aggregates conveyed from the respective conveyor feeders are once gathered, dried and heated by a dryer, and then distributed by the distribution device, the aggregates conveyed from the individual conveyor feeders are stored in a plurality of storage bins. On the other hand, since it is supplied all at once in a predetermined ratio according to the granularity, the total inflow of only the designated storage bins had to rely on experience.

Therefore, the present invention has been made in view of the above-described problems, and an object thereof is to provide a granular material that can always supply a constant inflow amount of granular material without causing individual differences due to operator operations. It is to provide an object supply control device.

[Means for Solving the Problems] In order to achieve the above object, a plurality of granular material supply control devices according to the present invention are arranged according to the particle size of the granular material, and the granular material is conveyed at a constant ratio by the granularity. A plurality of conveying means, a plurality of accommodating means arranged in the same number or less as the conveying means and accommodating the granular material conveyed for each of the conveying means, and a plurality of the granular materials accommodated in the plurality of accommodating means, respectively. Measuring means for measuring in parallel for each accommodating means, setting means for designating accommodating means for which adjustment of the inflow amount of particulate matter is necessary and setting the total supply amount thereof, and supply of granular material for each accommodating means A storage unit storing a ratio table indicating a ratio, the weighing value data of the particulate matter by the weighing unit of the accommodating unit set by the setting unit, and the setting data by the setting unit are compared, and a difference between both data is obtained. This difference is corrected when Based on the setting information, the comparison and correction means for outputting as positive data, and according to the ratio table, the supply amount of the particulate matter to the storage means designated by the setting means matches the set total supply amount. An arithmetic control unit that calculates the supply amount of the conveying unit and again calculates the supply amount of each of the conveying units according to the ratio table based on the correction data of the comparing unit, and the arithmetic unit based on the arithmetic result of the arithmetic control unit. And driving means for controlling the driving of each of the conveying means.

[Operation] When the setting means specifies the accommodating means that needs to adjust the inflow amount of the particulate matter and sets the total supply amount, the arithmetic control means specifies the accommodating means based on the setting information. The supply amount of each conveying unit is calculated according to the ratio table stored in the storage unit so that the supply amount of the granular material to the storage unit matches the set total supply amount. Then, the drive of the corresponding conveying means is controlled based on the calculation result. The comparison / correction means compares the supply amount data of the granular material by the measuring means with the set value data by the setting means, and when a difference occurs between the two data, outputs the correction data by the difference to the arithmetic control means. As a result, the arithmetic control means recalculates the supply amount of the granular material to the accommodating means of each conveying means on the basis of the correction data based on the difference to control the driving of the conveying means and the opening / closing of the gate of the accommodating means.

[Embodiment] FIG. 1 is a block diagram showing an embodiment of a particulate matter supply control apparatus according to the present invention.

The granular material supply apparatus according to this embodiment controls the supply amount of granular materials having different particle sizes, in particular, the aggregate W that is the source of the mixture in an asphalt plant, and includes a transport feeder (transport means) 1 and a storage bin ( (Accommodating means) 2, measuring means 3, setting means 4, storage means 5, arithmetic control means 6, drive means 7, and comparison correction means 9.

According to the grain size of the aggregate W, m feeders 1 are provided,
The number of revolutions is controlled by being activated by a drive signal from a drive means 7 which will be described later, and the aggregate W is conveyed to a dryer (not shown) at a constant speed by a predetermined amount in order to obtain the mixture.

Similar to the transport feeder 1, n storage bins 2 are arranged according to the particle size of the aggregate W (the same number as the transport feeder or a smaller number: n ≦ m), and the storage bin 2 is dried and heated by a drier to sort ( The aggregate W sorted by a predetermined grain size (not shown) is housed.

The weighing means 3 weighs the aggregate W stored in each storage bin 2, and outputs each weighing value data to the comparison and correction means 9.

The setting means 4 is a storage bin 2 that requires adjustment of the inflow amount of the aggregate W.
The storage bin number is designated, and the aggregate total inflow amount after the increase (or decrease) is adjusted is set, and each setting signal based on these settings is output to the arithmetic control unit 6.

In the storage means 5, the aggregate W transported from each transport feeder 1
A ratio table indicating a distribution ratio for each accommodation bin 2 is stored.

The arithmetic control means 6 is based on the setting signal from the setting means 4,
In order that the designated storage bin 2 finally substantially matches the set aggregate total inflow amount, the total supply amount of each transport feeder 1 is calculated in accordance with the ratio table of the storage means 5, and each transport feeder 1 and the corresponding storage. A control signal for driving the gate 2 a of the bin 2 is output to the driving means 7. When the correction data from the comparison and correction means 9 to be described later is input, the arithmetic control means 6 is an aggregate W for each conveyance feeder 1 centered on the conveyance feeder designated according to the ratio table of the storage means 5. Is calculated again and a control signal is output to the driving means 7.

Here, an example of the calculation procedure by the calculation control means 6 will be described.

Now, assuming a state where five accommodation bins 2 are arranged for eight transportation feeders 1, the total supply amount sent to each accommodation bin 2 is Ki [t / h], Total supply is Fj
[T / h], if the supply ratio from each transport feeder 1 to each storage bin 2 is W _mn , K1 = F1 W11 + F2W12 + F3W13 + ... + F8W18 K2 = F1 W21 + F2W22 + F3W23 + ... + F8W28 :: K5 = F1W51 + F2W52 + F3W53 + ... + F8W58. When this equation is transformed, Becomes

However, W11 + W21 + ... + W51 = 1 W12 + W22 + ... + W52 = 1 :: W18 + W28 + ... + W58 = 1.

Next, the supply amount of the l-th storage bin after the change is K′l = K
Put it as l + ΔKl, K′l = W11 (F1 + ΔF1) + W12 (F2 + ΔF2) +… + W18 (F8 + ΔF8) K′2 = W21 (F1 + ΔF1) + W22 (F2 + ΔF2) +… ＋ W28 (F8 + △ F8) ：: K′5 ＝ W51 (F1 + △ F1) + W52 (F2 + △ F2) +… ＋ W58 (F8 + △ F8) to K′1 ＝ (W11F1 + W12F2 +… + W18F8) ＋ W11 △ F1 + W12 △ F2 +… + W18 △ F8 K′2 ＝ (W21F1 + W22F2 +… + W28F8) ＋ W21 △ F1 + W22 △ F2 +… + W28 △ F8 ：: K′5 ＝ (W51F1 + W52F2 +… + W58F8) ＋ W51 △ F1 + W52 △ F2 +… + W58 △ F8 (A: real number) −F1 to ΔF8 are obtained so that −.

Here, since the number of variables = 8 and the number of relational expressions = 5, the solution is indefinite (distributed on the curve determined by the coefficient matrix).
By fixing (treating as constant) three variables in one variable, the solution is derived under the condition of the determinant of the coefficient sequence in the above equation: | W | = O.

Next, as shown in the formula, the supply amount of the first storage bin is increased by a, that is, ΔKl = a is set, and the increase amount of each supply amount of the sixth, seventh, and eighth transport feeders is respectively ΔF6. = △ F7 ＝ △ F8
The formula when = O is given as follows from the formula.

When the above equation is W · F = A, the increment from each feeder can be obtained as F = W−1 · A−.

Also, using Cramer's formula, Can be derived.

The above is explained with the special example of ΔF6 to ΔF8 = O.
Generally, any of ΔF1, ΔF8, and ΔFi, ΔFj, and ΔFk
If three of − are selected and set to zero, F other than is obtained under the condition of | W | ≠ 0.

Further, in the formula, when the increase of four or more feeder supply amounts, ΔFi, ΔFj, ΔFk, ΔF1, ...
(Number of variables) <(Number of relational expressions), and generally "no solution".

Therefore, the number m of transport feeders and the number n of storage pins are n ≦ m
If the above relation is satisfied, the supply amount of each of the transport feeders 1 is determined, and the set amount of aggregate W can be supplied to the accommodation bin 2 designated by the setting means 4.

The driving unit 7 switches the transport feeder 1 designated based on the control signal from the arithmetic control unit 6 to a predetermined rotation speed to transport the aggregate W to the dryer side.

The gate opening / closing means 8 opens / closes the gate 2a of the accommodation bin 2 designated based on the drive signal from the drive means 7.

The comparison / correction means 9 compares the supply amount data from the measuring means 3 with the set value data (total aggregate inflow amount) from the arithmetic control means 6 based on the setting of the setting means 4, and compares the supply amount data with the set value data. If there is a difference between the two, the correction data is output to the arithmetic control means 6 to cancel this difference.

Next, the operation of the particulate matter supply control device configured as described above will be described by taking as an example the case where there are eight transport feeders and five storage bins.

First, when the accommodation bin number and the total aggregate inflow amount are set by the setting means 4 (ST1), these setting information are output to the arithmetic control means 6. When the setting is completed, the arithmetic control unit 6 obtains the supply amount according to the set value for the designated accommodation bin 2, so that the accommodation bins 2 of the respective conveyance feeders 1 can be obtained in accordance with the above-mentioned arithmetic procedure based on the ratio table of the storage unit 5. The amount of aggregates to be supplied is calculated (ST2). As a result, a control signal is output to the drive means 7 in order to control the transport feeder 1 and the gate 2a of the storage bin 2. For example, when it is desired to increase the aggregate inflow amount of the third storage bin, the fourth transport feeder that transports the aggregate W having a grain size close to that of the aggregate W stored in the third storage bin. The increased supply amount of the third, fourth, and fifth transport feeders centering on is calculated. At this time, the other transport feeders are fixedly maintained at the supply amount up to that point. Then, based on the control signal output based on the calculation result by the calculation control means 6, the drive means 7 controls the rotation speed of each conveyance feeder 1 (ST3).

On the other hand, the measuring means 3 supplies the supply amount (t / h) for each storage bin 2.
Data is periodically taken and output to the comparison / correction means 9 (ST4). The comparison / correction means 9 compares the supply amount data of the accommodation bin 2 designated by the setting means 4 with the set value data (ST5), and when there is a difference between the supply amount data and the set value data, The correction data of this difference is output to the arithmetic control means. Then, when the correction data is input from the comparison and correction means 9, the arithmetic control means 6 receives the correction data from the comparison and correction means 9, and based on the correction data, the aggregate W for each of the conveyance feeders 1 centered on the conveyance feeder specified according to the ratio table of the storage means 5. Is calculated again (ST6) and the above-described control of the transport feeder 1 is repeated.

Therefore, in the apparatus of the above-described embodiment, by setting the accommodating bin number and the total aggregate inflow amount by the setting means 4, the aggregate inflow change amount other than the designated accommodating bin is suppressed as much as possible and the supply to each accommodating bin 2 is performed. The amount can be arbitrarily adjusted according to the remaining amount, and it is possible to constantly supply the aggregate W with a small error without causing individual differences in the supply amount by the operation of the operator as in the conventional case. .

By the way, in the above-mentioned embodiment, the supply device of the aggregate W which is the source of the mixture in the asphalt plant has been described as an example, but the device is not limited to the aggregate W and the device for distributing and supplying the substances having different particle sizes in other materials as well. In that case, the same effect as that of the above-described embodiment can be obtained.

[Effects of the Invention] As described above, according to the particulate matter supply control device of the present invention, the inflow change amount of the particulate matter other than the designated accommodating means is suppressed as much as possible, and the granular material supply amount to each accommodating means is reduced. It can be arbitrarily adjusted according to the remaining amount, and it is possible to constantly supply the granular material with a small error without causing individual differences in the supply amount by the operation of the operator as in the conventional case. Moreover, since the granular material accommodated in each accommodating means is weighed in parallel for each accommodating means, the measuring time can be shortened and the work efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a particulate matter supply control apparatus according to the present invention, and FIG. 2 is a flow chart showing the operation of the control apparatus. 1 ... Transport feeder (transport means), 2 ... Storage bin (storage means), 3 ... Measuring means, 4 ... Setting means, 5 ... Storage means, 6 ... Arithmetic control means, 7 ... Driving means , 9 ……
Comparative correction means, W ... aggregate (granular material).

Claims (1)

[Claims] 1. A plurality of conveying means, which are arranged in accordance with the particle size of the granular material, and convey the granular material according to the particle size at a constant rate, and the conveying means are arranged in the same number or less. A plurality of accommodating means for accommodating the granular material conveyed to the container, a measuring means for measuring the granular material accommodated in the plurality of accommodating means in parallel for each accommodating means, and an adjustment of the inflow amount of the granular material are required. Setting means for designating different storage means and setting the total supply amount thereof, storage means for storing a ratio table showing the supply ratio of the granular material for each storage means, and storage means set by the setting means. Of the particulate matter measured value by the measuring means and the setting data by the setting means, and when there is a difference between the two data, the comparison and correction means for outputting the difference as correction data, and the setting information. Based on the setting means In order to match the supply amount of the granular material to the designated storage device with the set total supply amount, the supply amount of each of the transporting devices is calculated according to the ratio table, and based on the correction data of the comparing device, It is characterized by further comprising arithmetic control means for recalculating the supply amount of each of the conveying means in accordance with the ratio table, and driving means for controlling the drive of each of the conveying means based on the arithmetic result of the arithmetic control means. Granule supply control device.