JPH0753961B2 - 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 material falling when the gate of the storage bin is closed by the weighing completion signal) from the set value in consideration of the drop correction The gate is closed to stop the material input. Then, this free fall correction value is set in advance before the start of weighing, and at the time of the first weighing, the operator sets it by key input on the free fall correction screen of the CRT display device of the plant operation panel. The free fall correction value set to is continued, and when the first weighing is started, the free fall correction value is set, and after the second batch, the free fall correction value obtained by adding and subtracting the previous weighing error is used for weighing. . Therefore, if the composition of the asphalt mixture to be shipped changes, the drop value of each material will also change, so if you want to perform accurate initial weighing, the drop correction value should be adjusted according to the composition of the asphalt mixture to be shipped. It was very troublesome to change and input.

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.

[Problems to be Solved by the Invention] However, in the case of an aggregate having a structure in which the material is directly discharged from a large-capacity storage bottle to a lower measuring tank among the materials of the asphalt mixture, the material discharge speed is It also changes depending on the storage level of the material stored in the bottle, and it is considered that this change in the payout speed has a considerable influence on the amount of head when measuring the material. In this respect, the conventional method has not been considered at all.

In view of the above points, the present invention provides a material weighing method for an asphalt plant aiming to realize more accurate material weighing by determining the head correction value in consideration of the storage level of aggregate. It is a thing.

[Means for Solving the Problems] In order to achieve the above object, the present invention detects an aggregate storage level in an aggregate storage bin for sieving aggregate dried by heating with a dryer and storing the aggregate by particle size. Set up a level meter,
The plant control unit stores in advance the drop correction value for each material used as the raw material of the asphalt mixture for each compounding number, and particularly for aggregates, multiple drop corrections corresponding to the storage level of the aggregates are stored. The value is stored, and the head drop correction value of each material corresponding to the asphalt mixture material number reserved for shipment when the first batch is weighed is called, and the level signal of the aggregate detected by the level meter is sent to the control unit. Capture, select the drop correction value corresponding to the level signal,
The weighing is performed based on these head correction values.

[Operation] In the material measuring method for an asphalt plant according to the present invention, the head correction value at the time of the first measurement of each material used as the material of the asphalt mixture is stored in advance in the storage device for each compounding number. . That is, the manufactured asphalt mixture is given a compounding number except for 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. For example, ML-01, ML-02,
The set measurement value of each material is registered with ML-03 and the recipe number, and about 100 to 500 kinds are registered when all the recipes are included. The free fall correction value is registered. Particularly for aggregate, the storage level in the storage bin is divided into several levels, and a plurality of head correction values corresponding to the storage level steps are stored. Then, if the asphalt mixture with the desired composition number is reserved for shipment, the set measurement value of each material corresponding to the composition number is called and the drop correction value of each material is also called. Here, for the aggregate, the storage level of the aggregate is detected by a level meter attached to the storage bottle,
The head correction value corresponding to the storage level is selected. In this way, the first batch is weighed based on the head correction value selected and selected.

[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.

Reference numeral 1 denotes an aggregate storage bin for storing aggregate dried and dried by a dryer (not shown) which is an aggregate heating device according to particle size, and the compartments 1a to 1d are partitioned by partition plates inside the bin.
Are formed, and large gravel, medium gravel, small gravel, and sand are stored in the compartments 1a to 1d according to particle size. And each compartment
A level meter 2 for detecting the storage level is provided at 1a to 1d. The level meter 2 in the illustrated example is of a type that detects the presence or absence of aggregates at the installation position, and there are a plurality of levels between the highest level full detection level meter and the lowest empty level detection level meter. The meters are installed at appropriate intervals so that the approximate storage amount can be grasped. If there is a highly accurate continuous level meter, it may be adopted.

Level signals detected by the level meters 2 of the compartments 1a to 1d of the aggregate storage bin 1 are taken into the control panel 3 and the central arithmetic control of the control panel 3 is performed via the process input / output device 4 for exchanging signals with external devices. Informed to the device 5. Further, below the aggregate storage bin 1, there are provided an aggregate scale 6, a stone dust scale 7 and an asphalt scale 8, and weighing signals of these scales are sent to the central processing unit 5 via the input / output device 4. Reportedly.
The central processing and control unit 5 issues a weighing completion signal via the input / output unit 4 at the time when the amount obtained by subtracting a drop correction value described later from the weighing set value is weighed, and the input of the material to the weighing device is stopped. The central processing unit 5 processes a signal input from an external device, has a storage device 9 for storing necessary operation blocks, display and recording signals, and controls the entire plant.
A CRT display device 10 for displaying the output result in a message or graphic form on a cathode ray tube is connected to the central processing unit 5, and the CRT display device 10 also has a keyboard 11 for selecting screens and inputting signals. Is attached, and the operator can select any screen of the CRT display device 10 and key-input various input data and drop correction values in advance. An operator's console 12 including a push button switch for operating the plant is also attached.

FIG. 2 is a setting screen view of the fall correction value of the CRT display device 10. On this setting screen, it is possible to set and register the drop correction value for each mix of asphalt mixture, and if the drop correction value has already been set and registered, that value can be displayed and corrected. ing. ML-01 represents the compound number, and even if it is the same dense-grained ascon, if the compound composition of the material changes, it will be assigned a number like ML-01, ML-02 ... The value is registered in the storage device 9.

Levels 1, 2, ... Show the range of storage levels detected by the level meter 2 of the aggregate storage bin 1, and the storage level of the aggregate storage bin 1 is divided into five stages. The number of steps for dividing the storage level may be appropriately determined according to the capacity of the aggregate storage bin 1. The larger the number of steps, the finer the head correction value can be set. However, if the number of steps is too large, the setting input becomes troublesome, so an appropriate number of steps is required. Is desirable. If you enter the recipe number in the recipe number input field on the setting screen of this fall correction value, the data of the fall correction value of each material corresponding to the entered recipe number will be displayed if it has already been registered, If there is a correction, aggregate (AG1 to AG4), stone powder (FR1, FR2), asphalt (AS
1, AS2), and when using waste materials, it is possible to enter the drop correction values of all the materials to be measured, such as waste materials. Especially for aggregates (AG1 to AG4), the storage level (level 1) Up to level 5) can be input. These drop correction values are set and input after grasping proper values by trial operation or the like, and stored in the storage device 9.

Since the drop correction value is set for all of the registered recipe numbers in this way, there are about 20 types of fine-grained ascon only, including fine-grained ascon, modified Topeka coarse-grained ascon, stabilization treatment, special ascon, etc. Will be displayed over. This combination number is SA01, SA02 ... (or fine grain-
01, fine grain-02 ...) Modified Topeka is SU01, SU02 ...
(Or modified-01, modified-02 ...), coarse-grained ascon S001, S002 ... (or coarse-grain-01, coarse-grain-02 ...
・), Stabilization processing is AS01, AS02 ... (or stabilization-01,
Stable-02 ...), and special ascon is the one with the compound name numbered as T01, T02 ... (or Special-01, Special-02 ...). ML-01, ML
Although -02 ... may be called a recipe name, it is called a recipe number here to avoid confusion. The number of types of asphalt mix varies depending on the manufacturing plant,
About 500 kinds are registered, and the drop correction value of each material is set and input on the drop correction screen of FIG.

Then, by selecting the shipping instruction screen of the CRT display device 10 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 9. Is called from. Then, when a command to start weighing is issued from the operator's console 12 for operating the plant, weighing is started. The weighing of the first batch in the weighing machine is performed based on the preset head correction value, but regarding the aggregate, the storage level of each aggregate is detected by the level meter 2 of the storage bin 1, and the detected storage level is set. The corresponding free fall correction value is selected and weighed based on this. Here, the initial batch means, for example, that the storage level of the aggregate in the storage bin has changed when the composition to be shipped is changed, when a predetermined time has passed from the previous shipment to the current shipment, at the start of plant operation. The first weighing batch, such as hour, is shown. Note that the weighing from the second batch onward is the same as the conventional weighing method, and the weighing error of the previous time is calculated, and the weighing error is measured by the drop correction value obtained by adding and subtracting the weighing error to the previous drop correction value.

[Effects of the Invention] In the material measuring method in the asphalt plant according to the present invention, the head correction value is determined in consideration of the storage level of the aggregate storage bin as well, and therefore the accuracy is higher than that of the conventional method. Material weighing can be realized.

[Brief description of drawings]

FIG. 1 is a system diagram of measurement control of a material measurement method in an asphalt plant according to the present invention, and FIG. 2 is a setting screen view of a head correction value of a CRT display device. 1 ... Aggregate storage bottle, 2 ... Level meter, 3 ... Control unit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-64-48906 (JP, A) JP-B-53-31739 (JP, B2)

Claims (1)

[Claims] 1. A level meter for detecting the storage level of aggregate is provided in an aggregate storage bin for sieving the aggregate dried by heating with a dryer to store the aggregate according to particle size, and the plant control unit is previously equipped with an asphalt mixture. The drop correction value at the time of measurement of each material used as the material of each is stored for each recipe number, and particularly for the aggregate, a plurality of drop correction values corresponding to the storage level of the aggregate are stored, and the initial batch The drop correction value of each material corresponding to the mix number of the asphalt mixture material reserved for shipment at the time of weighing is called, and the level signal of the aggregate detected by the level meter is fetched into the control unit and the drop correction corresponding to the level signal is fetched. A method for weighing materials in an asphalt plant, wherein values are selected and weighing is performed based on these head correction values.