JPH07107248B2 - Material measurement method in asphalt plant - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for measuring a material in an asphalt plant for producing an asphalt mixture which is a road paving material.

[Prior Art] In an asphalt plant, heated aggregates are stored in storage bins of the plant body for each particle size, and the aggregates of various particle sizes are cumulatively measured with a measuring device based on the mix of the asphalt mixture to be manufactured. At the same time, asphalt and stone powder are also weighed by their respective weighing devices and put into a mixer to produce an asphalt mixture.

When measuring the amount of each material, subtracting the drop correction value (the amount of the falling material when the gate of the storage bin is closed by the weighing complete signal) from the set value in consideration of the drop correction Although the gate is closed to stop the material input, it is necessary to set the drop correction value for the first weighing in advance. This drop correction value can be changed and set when the operator key-in information such as the mix name, mix number, and shipment quantity of the asphalt mixture to be reserved for shipment on the shipment command screen of the CRT display device on the plant operation panel. Therefore, when the fall correction value is not changed, the previously set fall correction value is continued. Then, the first batch is weighed by the set head correction value, and the second and subsequent batches are weighed by the head correction value obtained by adding and subtracting the previous weighing error. However, if the composition of the asphalt mixture to be shipped changes, the drop correction value of each material also changes, and it is very troublesome to change and input the drop correction value each time, and after the second batch, the weighing error automatic calculation is performed. Since the drop correction value becomes an appropriate value, the drop correction value is often not changed even if the composition is changed. In this case, an error occurs in the measurement of the first batch.

Therefore, in Japanese Patent Laid-Open No. 63-217004, a drop correction value at the time of initial measurement of each material used as a raw material of an asphalt mixture is stored in advance in a storage unit for each compound name, and the asphalt mixture reserved for shipment is stored. The time required to set the drop correction value each time the shipping composition changes by calling the drop correction value of each material that matches the material mix name from the storage unit and weighing the first batch based on the drop correction value. We have proposed a material weighing method for asphalt plants that can perform weighing with less error from the first batch without the need for.

In addition, conventionally, when kneading materials with less than the rated capacity of the mixer, for example, when kneading 0.75 tons of material with a mixer with a rated capacity of 1 ton, each material is weighed in proportion to the actual kneading amount, but the head correction value Uses the head correction value of 1 ton as it is.

[Problems to be Solved by the Invention] However, as in the measuring method of Japanese Patent Laid-Open No. 63-217004, dense particle size ascon, fine particle size ascon, modified topeca,
It is possible to improve the measurement system to some extent by setting the drop correction value of each material for each of the 10 types of compound names such as coarse-grained ascon, stabilizing treatment, special ascon, etc. For example, there are dozens of types of ascon manufactured in Japan, even fine-grained ascon, and the compounding ratio of each of these materials is different.Therefore, adopting a uniform head correction value for each compounding name is a measure. There is some error.

In addition, when kneading less than the rated capacity, such as kneading 0.75 tons of material with a mixer with a rated capacity of 1 ton, if you do not correct the set value of each material and at the same time correct the head correction value, there will be some error in weighing. Will occur.

In view of the above points, an object of the present invention is to propose a material weighing method in an asphalt plant that can further improve the weighing accuracy by minimizing the error in the head difference correction at the time of weighing the material.

[Means for Solving the Problems] In order to achieve the above object, the present invention roughly classifies asphalt mixture materials to be manufactured according to product types and gives compound names, and the compounding amount of the materials for the major classification. Each material used as a raw material for asphalt mix, equipped with a storage device that can be further classified according to the difference of The drop correction value at the time of measurement is stored in advance in the storage device for each formulation number, and the drop correction value of each material corresponding to the formulation number of the asphalt mixture material reserved for shipment is called from the storage device, The feature is that the first batch is weighed based on the correction value.

In addition, the drop correction value at the time of weighing of each material used as the material of the asphalt mixture is stored in advance in a storage device for each composition number or composition name, and the composition number or composition of the asphalt mixture material reserved for shipment is stored. The drop correction value of each material corresponding to the name is called from the storage device, and the kneading amount correction coefficient with respect to the actual kneading amount is proportionally calculated with the kneading amount correction coefficient at the rated capacity of the mixer being 1, and the kneading amount correction coefficient is calculated as described above. The feature is that the free fall correction value is determined by multiplying the free fall correction value, and the weighing is performed based on the corrected free fall correction value.

In addition, the drop correction value at the time of measuring each material used as the raw material of the asphalt mixture, and the kneading amount correction coefficient relative to the actual kneading amount calculated by proportionally calculating the kneading amount correction coefficient at the rated capacity of the mixer as 1 to the drop correction value. The corrected head correction value determined by multiplying by is stored in advance in the storage device for each recipe number or each recipe name, and the fall correction value of each material corresponding to the recipe number or the recipe name of the asphalt mixture material reserved for shipment. Call the corrected free fall correction value from the storage device, and use the free fall correction value if the actual kneading amount to be kneaded in the mixer is almost the rated capacity, and correct it if the actual kneading amount is less than or equal to the rated capacity. It is characterized by adopting a free fall compensation value for weighing.

[Operation] According to the present invention, the drop correction value at the time of initial measurement of each material used as the material of the asphalt mixture is stored in advance in the storage device for each compound number. That is, the manufactured asphalt mixture is added with the compound number except for the special mixture if the set value of each material is different, and all of them are registered in the storage device of the control panel. Then ML
-01, ML-02, ML-03 and so on, the set value of each material is registered with the compound number, and 100 is included when all the compounds are included.
About 500 kinds are registered, but the drop correction value of each material is registered for all of them. Then, if the asphalt mixture with the desired recipe number is reserved for shipment, the set measurement value of each material corresponding to the recipe number is called and the head correction value of each material is also called, and the initial batch becomes the head correction value. Based weighing is performed.

In addition, in order to perform accurate weighing when kneading materials with less than the rated capacity of the mixer, data on the kneading amount correction coefficient for correcting the head correction value is stored in the storage device of the control panel, and the head correction value is stored. Is multiplied by a kneading amount correction coefficient according to the actual kneading amount to determine a corrected head correction value. For example,
Programming is performed to determine the kneading amount correction coefficient in proportion to the actual kneading amount, and when kneading 0.75 tons of material with a mixer with a rated capacity of 1 ton, 0.75 is selected as the kneading amount correction coefficient and each material is selected. The corrected free fall correction value is calculated by multiplying the free fall correction value of 0.75 by 0.75, and each material is weighed based on the corrected free fall correction value.

In addition, in order to perform accurate weighing when kneading materials with less than the rated capacity of the mixer, the drop correction value and the corrected drop correction value at the time of weighing each material used as the raw material of the asphalt mixture are specified for each compound number or compound. Each name is stored in the storage device in advance, and if the actual kneading amount in the mixer is almost the rated capacity, the above-mentioned head correction value is adopted for measurement. Then, the actual kneading capacity in the mixer is less than or equal to a predetermined value with respect to the rated capacity,
If the free fall correction value is used as it is, if the drop correction value is used as it is, a considerable error occurs in the weighing. Therefore, the corrected free fall correction value is used to perform the weighing.

[Examples] Examples of the present invention will be described in detail below.

FIG. 1 is a system diagram of measurement control of various materials in an asphalt plant.

The asphalt plant is equipped with an aggregate measuring instrument 1, a stone dust measuring instrument 2, and an asphalt measuring instrument 3 for cumulatively measuring aggregates of various particle sizes, and the measurement signals of these measuring instruments are exchanged with external devices. It is transmitted to the central processing control device 6 of the control panel 5 via the input / output device 4. The central processing control device 6 outputs a weighing completion signal via the input / output device 4 at the time when the amount obtained by subtracting a later-described drop correction value from the weighing set value is weighed, and the input of the material is stopped. The central processing unit 6 has a storage device 7 which processes signals input from external equipment and stores necessary operation blocks, display and recording signals, and controls the entire plant. The central processing unit 6 is connected to a CRT display device 8 for displaying the output result in a message or graphic form on a cathode ray tube, and the CRT display device 8 is also provided with a keyboard 9 for selecting screens and inputting signals. Is attached, and the operator can select an arbitrary screen of the CRT display device 8 and key-input various input data and a drop correction value in advance. An operator's console 10 including a push button switch for operating the plant is also attached.

FIG. 2 is a screen for setting the fall correction value of the CRT display device 8. ML and MS on the screen are two types of dense particle size ascon, showing the compound name of the asphalt mixture, ML-01,
ML-02 ... (may be indicated as dense grain-01 and dense grain-02) shows the compound number, and even if the same dense particle size ascon, if the compound of the material changes, distinguish by the compound number. The set measured value of each material is registered in the storage device 7. Then, when the setting screen of the fall correction value is displayed, the combination number stored in the storage device 7 is called and displayed in the combination number column, and if the drop correction value of each material is already registered, that data is displayed. If unregistered or modified, weigh aggregates (AG1 to AG4), stone powder (FR1 to FR2), asphalt (AS1 to AS2), and waste materials when using waste materials through the keyboard 9 for each recipe number. The fall correction values of all the materials to be processed can be input, and appropriate values are grasped and set in the trial run or the like and stored in the storage device 7. Since the drop correction value is set for all of the registered compound numbers in this way, there are about 20 types of fine-grained ascon alone, including fine-grained ascon, modified topeca, coarse-grained ascon, stabilizing treatment, special ascon, etc. It will be displayed across the screen. This combination number is
SA01, SA02 ... (or coarse particles-01, coarse particles-02 ...), modified topeka is SU01, SU02 ... (or modified-01, modified-02
・ ・ ・), Coarse-grained ascon S001, S002 ・ ・ ・ (or coarse-grain-01, coarse-grain-02 ...), stabilizing treatment AS01, AS02 ... (or stable-01, stable-02 ...), special Ascon is T01, T
02 ... (or Special-01, Special-02 ...) with the combination number added is the easiest to understand. ML
-01, ML-02 ... May be called as a recipe name, but here they are called a recipe number to avoid confusion. The number of types of asphalt mixture is different depending on the manufacturing plant, but about 100 to 500 types are registered, and for all of this mixture, the head correction value of each material is set and input and stored in the head correction screen in Fig. 2. It will be stored in the device 7.

Then, by selecting the shipping command screen of the CRT display device 8 and inputting the compounding number of the asphalt mixture to be shipped, the shipping amount, etc., the measurement setting value and the drop correction value of each material corresponding to the compounding number are stored in the storage device 7. Is called from. Then, when a command to start weighing is issued from the operator's console 10 for operating the plant, weighing is started. The weighing of the first batch in the weighing machine will be performed based on the preset head correction value, and the weighing errors of the second and subsequent batches will be calculated as the previous weighing error, and this weighing error will be used as the previous head correction value. It is measured by the addition / subtraction difference correction value.

In addition, in asphalt plants, there are many cases where materials that are less than the rated capacity of the mixer are kneaded.In such a case, the measured value of each material is decreased in proportion to the actual kneading amount. If the measurement is expected, it is necessary to correct the free fall correction value. Therefore, as described above, the drop correction value at the time of weighing each material used as the raw material of the asphalt mixture is stored in advance in the storage device 7 for each compounding number. Note that the drop correction value may be stored in the storage device 7 for each combination name as in the conventional case.

Further, in the storage device 7, data relating to the kneading correction coefficient for correcting the drop correction value when kneading materials having a smaller capacity than the mixer rated capacity is preset and stored. For example, programming is performed so that the kneading amount correction coefficient is determined in proportion to the actual kneading amount. In this case, when kneading 0.75 tons of material with a mixer having a rated capacity of 1 ton, 0.75 is selected as a kneading amount correction coefficient. When the shipment of the asphalt mixture is reserved, the drop correction value of each material corresponding to the compound number or the compound name is called from the storage device 7, and the kneading amount correction coefficient corresponding to the actual kneading amount to be kneaded this time is added to the above-mentioned difference. The correction value is multiplied to determine the corrected free fall correction value, and the weighing is performed based on the corrected free fall correction value. By doing so, when kneading materials having a rated capacity or less, the drop correction amount is also corrected proportionally, so that the measurement error can be minimized. Also, instead of determining the kneading amount correction coefficient in proportion to the actual kneading amount,
For example, when the actual kneading amount is 0.7 to 1.0 tons, the kneading correction coefficient is set to 1, and when the actual kneading amount is 0.7 to 0.5 tons, it is set to 0.6. The correction coefficient is programmed so that the correction coefficient can be appropriately set according to the actual kneading amount. It is also possible to display it on the display 8 and input and correct it while watching the actual driving state.

In addition, as a method of correcting the head compensation when kneading materials with less than the mixer rated capacity, the head compensation value at the time of weighing each material used as the material of the asphalt mixture and the corrected head compensation value are compounded by formulation number or formulation. Each name is stored in the storage device 7 in advance. Input and correction of the free fall correction value and the corrected free fall correction value may be performed on the screen of the CRT display device 8 as described above. This corrected head correction value is used when the kneading amount is significantly smaller than the mixer rated capacity. For example, when kneading 0.6 tons or 0.5 tons of material with a mixer having a rated capacity of 1 ton, the measured value of each material becomes about half, and if a drop correction value at the time of kneading with a rated capacity is adopted, a measuring error occurs. Therefore, if the actual kneading amount falls below what percentage of the rated capacity, the programming is performed so that the corrected free fall correction value is adopted, and at what percentage the corrected free fall correction value is adopted on the screen of the CRT display device 8. It is preferable to be able to input and correct with. About 60% is considered appropriate for this value.

Then, the head correction value and the corrected head correction value of each material corresponding to the composition number or composition name of the asphalt mixture material reserved for shipment are called from the storage device 7, and if the actual kneading amount to be kneaded by the mixer is almost the rated capacity. Adopting the drop correction value,
When the actual kneading amount becomes less than a predetermined value with respect to the rated capacity, the corrected free fall correction value is adopted to perform the measurement.

[Effects of the Invention] In the material measuring method in the asphalt plant according to the present invention, since the head drop correction value of each material that matches the composition is set for all the compounds used in the asphalt plant, it is possible to measure Appropriate head correction is performed according to each composition, and the first batch can be measured more accurately.

In addition, the kneading amount correction coefficient corresponding to the actual kneading amount is multiplied by the head correction value of the rated capacity to determine the corrected head correction value for weighing, so that even when mixing less than the mixer rated capacity Proper head correction can be performed and weighing errors are reduced.

Furthermore, the free fall correction value and the corrected free fall correction value at the time of weighing are set and stored, and if the actual kneading amount to be kneaded in the mixer is more than a predetermined value relative to the rated capacity, the above-mentioned free fall correction amount is adopted, and the actual kneading amount is the rated value. Since the corrected free fall correction amount is adopted when the amount becomes less than the predetermined value with respect to the capacity, even when the material having an extremely small amount with respect to the rated capacity is kneaded, the proper free head correction can be performed and the measurement error is reduced.

[Brief description of drawings]

FIG. 1 is a diagram of a measurement control system for various materials in an asphalt plant, and FIG. 2 is a head correction setting screen of a CRT display device according to an embodiment of the present invention. 1 ... Aggregate weighing instrument, 2 ... Stone dust weighing instrument, 3 ... Asphalt weighing instrument, 5 ... Control panel, 6 ... Central arithmetic and control unit,
7 ... storage device, 8 ... CRT display device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 63-217004 (JP, A) JP 63-200824 (JP, A)

Claims (3)

[Claims] 1. The asphalt mixture to be manufactured is roughly classified according to the type and given a composition name, and further classified according to the difference in the compounding amount of the material with respect to the large classification, and a composition number is given as a minor classification. Equipped with a storage device that can store all of the sub-classified products with this recipe number, the drop correction value at the time of weighing of each material used as the raw material of the asphalt mixture is stored in advance for each recipe number. Store it in the device,
In the asphalt plant characterized in that the head correction value of each material corresponding to the asphalt mixture material number reserved for shipment is called from the storage device, and the first batch is measured based on the head correction value. Material weighing method. 2. The asphalt mixture material for which a drop correction value at the time of weighing each material used as an asphalt mixture material is stored in advance in a storage device for each composition number or composition name, and the shipment is reserved for shipment. The drop correction value of each material corresponding to the number or the compound name is called from the storage device, and the kneading amount correction coefficient for the actual kneading amount is compared and calculated by setting the kneading amount correction coefficient at the rated capacity of the mixer to 1, and the kneading amount correction is performed. A material weighing method for an asphalt plant, wherein a coefficient is multiplied to the free fall correction value to determine a corrected free fall correction value, and weighing is performed based on the corrected free fall correction value. " 3. Kneading with respect to an actual kneading amount calculated by proportionally calculating a drop correction value at the time of measurement of each material used as a raw material of an asphalt mixture and a kneading amount correction coefficient at the rated capacity of the mixer to 1 with the drop correction value. The corrected free fall correction value determined by multiplying the quantity correction coefficient is stored in advance in the storage device for each recipe number or each recipe name, and the material corresponding to the recipe number or the recipe name of the asphalt mix material reserved for shipment is stored. The free fall correction value and the corrected free fall correction value are called from the storage device, and if the actual kneading amount to be kneaded in the mixer is almost the rated capacity, the above free fall correction value is used and the actual kneading amount is less than the predetermined value with respect to the rated capacity. For example, a material measuring method in an asphalt plant, characterized in that the corrected free fall correction value is adopted for the measurement.