JPH0623734A - Material supply control method of concrete manufacturing plant - Google Patents

Abstract

PURPOSE:To efficiently supply a material by instantaneously supplying the material under supply control when the number of empty bins is larger than the reference number of empty bins at the time of operation and many storage bins transmit an empty signals and supplying the material under filling level supply control when the number of empty bins is smaller than the reference number of empty bins. CONSTITUTION:In the material supply control method of a concrete manufacturing plant, the reference number (a) of empty bins among storage bins 5a-5e becoming the selection reference value of the material supply control method is preset to an operation part and the number of empty bins among the storage bins 5a-5e during operation is set to (b) to perform the fallowing control. In the case of a<b, a time-limit timer to which a material delivery time is set is started at the time of the delivery of a material and the supply of the material to the storage bins is stopped by the signal emitted faster among the fill signal of the storage bins and the count-up signal of the time-limit timer. In the case of a>=b, the supply of the material to the storage bins is stopped by the fill signal of the storage bins and the material is supplied to the storage bins successively waiting the supply of the material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a material supply control method for a concrete manufacturing plant for manufacturing ready-mixed concrete.

[0002]

2. Description of the Related Art In a concrete manufacturing plant, different types of materials (gravel, sand) are stored in a plurality of storage silos, and the gates of the storage silos are opened and closed in sequence to prevent several types of materials from overlapping. It was cut out on a common belt conveyor and transported to the upper part of the plant, and the swivel distribution chute placed on the upper part of the plant was swung and moved in a timely manner to be positioned above the storage bin corresponding to each storage silo. By the way, the materials are put in and stored. Then, the material is dispensed from each storage bottle and weighed according to the mix of the concrete to be produced, the weighed material is put into a mixer, and cement, water and the like are added and kneaded to produce a desired fresh concrete.

As a method of controlling the material supply device in such a plant, when the cutting of the material from the storage silo is stopped, if the remaining amount of the material cut out on the belt conveyor is put into the storage bin, it becomes full. A level sensor is installed at the position, the material is cut out by an empty signal that detects that the material level is below the level sensor level, and preset even if the storage bin during material supply does not become full. When the fixed time elapses with the count-up of the time limit timer, the material supply is cut off,
Some have adopted a material supply method in which the supply to the storage bin waiting for the next material supply is started.

[0004]

However, in the material supply method using the time limit timer, it is possible to diligently supply the material to the empty storage bin, which can minimize the material shortage in the storage bin, and the storage bin capacity. On the other hand, it has an advantage that it can be made small, but it has a drawback that the number of times of switching the material supply tends to increase and the play time for rotating the distribution chute becomes long. Therefore,
When a plant with a relatively large storage bin capacity is operating at a slower shipping rate, the amount of material is reduced gradually, and there may be few storage bins that are idle during the same period. Even if there is a margin in time, if the supply time to one storage bin is limited by the time limit timer to switch wasteful material supply, it will take more supply time than necessary and the supply efficiency will be poor. Will end up.

In view of the above points, an object of the present invention is to provide a material supply control method for a concrete manufacturing plant, which enables the material supply to a storage bin that is being emptied to be performed as efficiently as possible.

[0006]

In order to achieve the above-mentioned object, the present invention provides a level sensor for detecting the empty state of the material in each storage bin, and the material level detected by the level sensor. Storage means for sequentially storing the descent of the empty signal as an empty signal, material cutting means for sequentially cutting the material from the storage silo corresponding to the storage bin that issued the preceding empty signal, and selecting the material supply method in advance. The reference empty bin number setting means for setting the reference empty bin number a of the storage bin serving as the reference value is compared with the empty bin number b of the operating storage bin and the reference empty bin number a, and a <b or a ≧ a determination means for determining b and a time supply control means for stopping the material supply to the storage bin by a signal that is issued earlier, which is the full signal of the storage bin or the count-up of the time limit timer if a <b Are those provided in the operation portion and a full level supply control means for stopping the supply of the material to the storage bin by fully signals a ≧ b if storage bin.

[0007]

According to the present invention, the material level of each storage bin is detected by the level sensor arranged in the storage bin, and when an empty signal is issued from the storage bin, it is stored in order of occurrence each time, and the preceding empty signal is stored. The material is cut out from the corresponding storage silo to the storage bin that has generated and the supply is started.
Then, the reference empty bin number a of the storage bins, which is the selection reference value of the material supply method stored in the operating unit in advance, and the actual empty bin number b during operation are compared, and when a <b, that is, the empty bin during operation When the number of bins is large, the material is distributed evenly to each storage bin by the timed feed control so as to prevent the material from running out. When a ≧ b, that is, when the number of empty bottles during operation is small, the material is supplied by full-level supply control to shorten the supply time. In this way, depending on the number of storage bins that are idle during operation, the preferred supply control of either the timed supply control or the full level supply control is selected, and efficient material supply that makes the most of each supply control is utilized. To do.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

1a, 1b ... 1e are aggregate silos for storing different kinds of materials (gravel, sand), and gates 2a, 2b ... 2 of the lower material outlet of the aggregate silos.
e is sequentially opened to cut out the material on the horizontal belt conveyor 3, and the material is transferred to the inclined belt conveyor 4 and conveyed above the plurality of storage bins 5a, 5b ... 5e above the plant. The distribution chute 6 is arranged at the end of the inclined belt conveyor 4 so as to be freely rotatable.
b ... 1e corresponding to storage bins 5a, 5b
The material is distributed into 5e.

The storage bins 5a, 5b ... 5e each have level sensors 7a, 7b for detecting an empty level.
..7e is provided. The installation position of the level sensor is such that the aggregate silos 1a, 1b ... Are detected by the signal that the material supplied has reached the position of the level sensor.
The storage bin 5 stores the material left on the horizontal belt conveyor 3 and the inclined belt conveyor 4 when the gates 2a, 2b ... 2e of 1e are closed to stop the cutting of the material.
The positions are such that the storage bins are almost full if they are accommodated in a, 5b ... 5e.

Although not shown, a measuring tank for measuring the material is disposed below the storage bins 5a, 5b ... 5e. After the material is dispensed from the storage bin and a predetermined amount is measured,
It is configured such that it is put into a mixer below the measuring tank, and water, cement, an admixture, etc. are added and kneaded to produce a predetermined ready-mixed concrete.

Next, a method of controlling the material supply device configured as described above will be described. Before that, a time supply control is performed in which a time limit timer is started at the same time as the material is cut out and the material is stopped by the count up. The full level supply control for stopping the material by the full signal will be described with reference to FIG. The upper part of FIG. 2 shows the time chart of the timed supply control, and the lower part shows the time chart of the full level supply control. As an example, an example of supplying gravel 1 and gravel 2 to the storage bins 5a, 5b is shown. In addition, t in the figure
Reference numerals 1 and t2 indicate the respective transport times of the gravel 1 and the gravel 2, and T is the time required for the distribution chute to rotate when the feed material is switched + α.

In the upper timed supply control, the supply time of gravel 1 is set to t1 and the supply time of gravel 2 is set to t2.
Suppose two storages fill each storage bin. The time required at this time is 2 (t1 + t2) + 3T.

On the other hand, in the lower full level control, the bins are filled up one by one, so the required time is 2 (t1 + t
2) + T.

As described above, in order to simply supply the material to fill the storage bin, the full-level supply control with less material supply switching can save the supply time than the timed supply control. On the other hand, the time delay supply control takes a longer supply time than the full level supply control, but the material can be replenished to the empty storage bin earlier so that the material is less likely to run out.

Next, the material supply control method of the present invention, which combines the timed supply control and the full level supply control, will be described with reference to the flow chart of FIG. S1 to S16 in the figure represent each step of the control procedure.

First, as a material supply control for a storage bin which is being idled before the operation of the plant, which one of the timed supply control and the full level supply control is selected to be efficiently supplied, and a selection reference value thereof, are selected. The reference empty bin number a is set in advance.

When the operation is started, the storage bottle 5a,
5b ... Level sensors 7a, 7b arranged on 5e
·················································································································································································· so If an empty signal is detected, the signals are stored in the order of detection (S2). Next, it is determined whether or not the empty signal detection is completed (operation end) (S3)
If it is the end (operation end), the process proceeds to END, and if it is not the end, the detection of the empty signal is continued and the order of the storage bins issuing the empty signal is stored one after another.

In parallel with the storage of the empty signal sequence, the stored contents are referenced to control the material supply to the empty bin. First, it is judged whether or not there is an empty bottle (S4), and if there is no empty bottle, it is judged whether or not the operation is completed (S6).
Proceed to D to finish. If not completed, the process returns to step 4 to wait for an empty bin. If there are empty bins, the order of detection of empty bins is confirmed (S6), and the number b of empty bins in operation is confirmed (S7).

Next, the preset reference number of empty bins a and the number of empty bins in operation b are compared (S8), and it is determined whether or not a <b (S9). If a <b, that is, the number of empty bins in operation b is larger than the reference number of empty bins a, the timed supply control is started. According to the detection order of the empty signal, if the storage bin 5a is ranked first, for example, the gate 2a of the corresponding storage silo 1a is opened to start the supply of the material (S10), and the storage bin 5a.
The time limit timer set for is activated (S11).
It is determined whether or not the level sensor 7a of the storage bin 5a detects the full level (S12), and if the full level is not detected, it is determined whether or not the time limit timer has counted up (S13). Step 1 if not counted up
Return to the detection of the full level of 2. If the time limit timer counts up, the gate 2a of the storage silo 1a is closed (S14), the supply of material from the storage silo 1a is stopped, and the process returns to step 4 to determine whether or not there is an empty bottle. . When the full level is detected in step 12, the process proceeds to step 14, the supply of the material from the storage silo 1a is stopped, and the process returns to step 4.

Further, in step 9, a <b is not satisfied,
That is, if it is determined that a ≧ b and the number of empty bins b in operation is less than the reference number of empty bins a, the full level supply control is started. The gate of the storage silo corresponding to the first storage bin of the empty signal is opened to start the material supply (S1).
5) Waiting for detection until the full level is detected (S1
6) When the full level is detected, the gate is closed to stop the material supply (S14). Then, returning to step 4, it is judged whether or not there is an empty bottle supply waiting state, and if there is an empty bottle, the above procedure is repeated to supply the material to the storage bin.

In this way, the number of empty bins in operation b is compared with the preset reference number of empty bins a, and if a <b, that is, the number of empty storage bins is more than the number of empty reference bins. Adopting a timed supply control that can frequently supply material to each storage bin so as not to run out of material, and
If a ≧ b, that is, if the number of empty storage bins is smaller than the set reference number of empty bins, the material supply is efficiently performed by adopting the full level supply control that can save the supply time.

[0023]

As described above, according to the present invention, the reference empty bin number a of the storage bins, which is the selection reference value of the material supply method, is preset, and the empty bin number b during operation is the reference empty bin number a. If a larger number of storage bins are empty, the material is supplied to each storage bin diligently by the timed supply control so that the material does not run out, and the number of empty bins b is the reference number of empty bins. If it is less than a, the material is supplied by the full level supply control that can reduce the number of times of switching the material and save the supply time. Therefore, it is possible to supply the material efficiently according to the empty transmission status of each storage bin during operation. Can be done.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a material supply device of a concrete manufacturing plant.

FIG. 2 is a time chart of timed supply control and full level supply control.

FIG. 3 is a flowchart showing an embodiment of the procedure of the method of the present invention.

[Explanation of symbols]

 1a, 1b, 1c, 1d, 1e ... Storage silo 5a, 5b, 5c, 5d, 5e ... Storage bin 6 ... Distribution chute 7a, 7b, 7c, 7d, 7e ... Level sensor

Claims (1)

[Claims] 1. A desired material is cut out from a plurality of storage silos for storing different kinds of materials, conveyed to the upper part of the plant by a belt conveyor, and a distribution chute on the upper part of the plant is switched to distribute and put it into a storage bin corresponding to each material. In the material supply device of the concrete manufacturing plant adapted to store, a level sensor for detecting the empty state of the material is arranged in each of the storage bins, and when the material level of the storage bin falls below the level sensor, The signal from the level sensor is stored as an empty signal in the operating section in order, and the material is sequentially supplied from the material hopper to the storage bin according to the order in which the empty signal is issued. If the reference number of empty bins of is set to the operation unit and the number of empty bins of the operating storage bin is b, and a <b, When a material is cut out, a time limit timer that sets the material cut time is started, and the material supply to the storage bin is stopped by the full signal of the storage bin or the count up of the time limit timer, whichever occurs first. The material supply control of the concrete manufacturing plant is characterized in that the material supply to the storage bin is stopped by the full signal of the storage bin, and the material is supplied to the storage bins waiting for the supply in sequence. Method.