JPH08309732A - Method for placing kneading material into concrete mixer, and measuring device used therefor - Google Patents

Abstract

PURPOSE: To provide a method for placing kneading material capable of correct ly controlling a placing timing and amount of kneading material into a concrete mixer in order that a kneading material fixed in its blend is kneaded efficiently uniformly in a short time, at a lower cost. CONSTITUTION: Previously obtained with respect to standard blending are a placing timing and placing speed of kneading material the kneading material is kneaded most effectively uniformly and the concrete mixer 12 is uniformed in its kneading load, and in accordance with the blending and volume of concrete to be produced, a placing timing and speed of the kneading material to the concrete mixer 12 from each measuring device 8-11 are calculated by the calculation part of a control device. The opening degree and opening and closing timing of the gate in each measuring device 8-11 are controlled so that kneading material is placed from each measuring device 8-11 to the concrete mixer 12 at the calculated timing and calculated speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for introducing a kneading material into a concrete mixer (hereinafter referred to as a mixer) in a ready-mixed concrete manufacturing plant called a batcher plant, and a measuring device used for the method.

[0002]

2. Description of the Related Art In a so-called batcher plant used for the production of ready-mixed concrete, generally, there are storage units for storing materials such as cement, water, aggregate (gravel, sand), admixture, etc. which constitute concrete. A weighing device for weighing each material and a mixer for kneading the materials are vertically stacked in layers. Then, the materials corresponding to each of them are put into each measuring device from each storage unit, and after being measured by each measuring device so that they have a predetermined composition, the measured materials are put into a mixer and kneaded. Is done.

In such a batcher plant, it is most important to uniformly and efficiently knead a kneading material having a predetermined composition in a short time. Therefore, conventionally, a kneading material such as measured gravel, sand, water, cement, an admixture or the like is put into a mixer at a constant timing so that the material is uniformly kneaded. . In that case, the kneading load of the mixer becomes maximum when gravel is added,
Since the power consumption increases accordingly, in order to mitigate the power consumption, for example, in Japanese Patent Publication No. 60-15445, the gravel input gate (exhaust gate) is jogged at the time of the gravel input from the measuring device to the mixer to intermittently gravel. Japanese Patent Publication No. 4-7964 proposes a method of opening and closing a closing gate according to a change in load current value of a motor for driving a mixer.

On the other hand, as for the addition of cement to the mixer, there is a method described in Japanese Patent Publication No. 3-71962. This uses a two-stage mixer consisting of two mixers, a primary mixer and a secondary mixer, so that the materials can be uniformly mixed in a short time. It is designed to be kneaded together in the lower secondary mixer.

Further, as a method of metering kneading water when the kneading is divided into primary kneading and secondary kneading, Japanese Patent Publication No.
In Japanese Patent Laid-Open No. 9-10886, it is proposed that a kneading water is divided into primary water and secondary water for measurement by using a water measuring device obtained by dividing a measuring tank into two.

[0006]

By the way, in the batcher plant, the load of the mixer becomes maximum when the gravel is charged as described above, but since the power of the mixer is set in accordance with such maximum load, Except during peak hours, it becomes excessive, and power consumption increases accordingly,
It is necessary to strengthen the structure of each part of the mixer.

Such a kneading load of the mixer at the time of gravel introduction causes the jogging of the gravel introduction gate to the above-mentioned JP-B-6.
Although it can be relaxed by the method described in Japanese Patent Publication No. 0-15445, in that case, since the feeding rate of the gravel to the mixer is slowed, the kneading time is prolonged and the gate is jogged. Requires a relatively large amount of energy.

Further, according to the method described in Japanese Patent Publication No. 4-7964, in which the closing gate is opened / closed according to the load current value of the mixer, not only the charging time of the gravel becomes unstable, but also the gravel in the middle of falling. Is a non-negligible amount, and there is a time delay until the load current value of the mixer changes according to the turning on and off of gravel, so the peak of kneading load, that is, the maximum load, is reduced at the optimum timing. It's difficult to get it done.

On the other hand, when the material is charged into the mixer, air corresponding to the volume of the material is discharged from the mixer together with dust and pollutes the plant and the environment. Therefore, a dust collector is attached as a means for preventing this. The dust collection capacity in that case is determined by the input capacity at the peak. Therefore, if the peak is large, a large dust collector is required, and the cost is increased accordingly.

Further, conventionally, there is a problem that it takes a long time to knead because the materials are not generally uniformly charged into the mixer. For example, as a result of pouring a large amount of the materials of each measuring device into the mixer at once, the materials are pressed against each other in the mixer, and the same material is biased to a part, so that there is a problem that it takes time for kneading. Such a phenomenon is particularly remarkable when materials having different specific gravities are simultaneously charged into the mixer.

Furthermore, depending on the composition, a large amount of cement and water are added in a short time, so that the cement forms a mass of so-called cement balls, and as a result, not only uniform mixing cannot be achieved, but also This causes a problem that the cement ball remains behind. It should be noted that such a problem can be considerably solved by using the above-described two-stage mixer, but the two-stage mixer has a larger device than a normal mixer, and its structure is relatively complicated. There is a problem that equipment costs and running costs are high.

Since the above-mentioned problem becomes more remarkable as the kneading capacity of the mixer becomes larger, it is a particularly important problem to solve it when the batcher plant is enlarged.

The present invention addresses such a problem, and provides a technique capable of precisely controlling the timing and amount of the kneading material to be fed into the mixer in the batcher plant, thereby providing a technique in a short time. The object of the present invention is to make it possible to increase the size of a plant as well as to reduce the cost during the production of green concrete by uniformly and efficiently kneading.

[0014]

In order to achieve the above object, a method for charging a kneading material into a concrete mixer according to the present invention is a method for mixing a kneading material most efficiently and uniformly in a batcher plant for producing fresh concrete. The kneading material charging time and the charging speed at which the kneading load of the mixer is leveled are obtained in advance for the standard composition,
Depending on the mix and volume of concrete to be manufactured, the timing and speed at which the kneading material should be fed into the concrete mixer from each metering device is calculated by the calculation unit of the control device, and each speed is calculated at the calculated time. It is characterized in that the opening degree and opening / closing timing of the gate in each measuring device are controlled so that the kneading material is fed from the measuring device to the concrete mixer.

In this case, regarding the cement measuring device among the measuring devices, the gate is once fully opened from the initial closed state so that the cement can be easily discharged from the discharge port of the device at the time of discharging the cement, and then the gate is fully opened. It is preferable to control the amount of cement discharged by narrowing the gate by a predetermined amount.

Further, as a weighing device used in the above method, the weighing device according to claim 3 of the present invention is capable of freely controlling the input amount and the input time of the material input to the mixer. It is characterized by being provided with a gate opening / closing drive mechanism capable of stopping the gate for opening and closing the outlet at an arbitrary intermediate position. As a drive means to be provided in this type of drive mechanism, for example, a pneumatic positioning cylinder, a pneumatic hydraulic cylinder, a servo motor, or the like can be used.
The application target in this case includes all of the measuring devices for cement, aggregate, water, admixture, and admixture.

As a weighing device for use in the above method, which is particularly suitable for weighing aggregates, a weighing device according to a fourth aspect of the present invention is provided near a discharge port opened and closed by a gate.
It is characterized in that a discharge control mechanism capable of freely adjusting the opening area of the discharge port is provided. The emission control mechanism in this case is
For example, a horizontal shaft provided on the outer surface of the weighing device so as to be located above the discharge port, and a swing plate that can be moved toward and away from the discharge port by swinging about the horizontal shaft. And a drive means for swinging the swing plate (the invention according to claim 5 of the present invention).

Further, as a metering device for use in the above method, which is particularly suitable for metering water, the metering device according to claim 6 of the present invention has therein a vertically movable valve mechanism for opening and closing a discharge port, The valve mechanism and a weir of variable height provided so as to surround the discharge port and capable of being brought into contact with and separated from the peripheral portion of the discharge port are provided as means for forming a gate, and the height of the weir The amount of primary water discharged from the device can be adjusted by changing

[0019]

According to the method of the present invention, the optimum gate opening / closing timing and opening degree of each weighing device in the composition are calculated and controlled based on the experimental result obtained in advance for the reference composition, whereby the concrete mixer is controlled. In order to equalize the kneading load, a predetermined amount of kneading material is introduced from a discharge port of each measuring device at a predetermined time. Therefore, the power of the mixer can be set low by leveling the kneading load when the kneading material is put into the mixer. As a result, it is possible to reduce the power consumption of the mixer and the abrasion of each part of the mixer, and the running cost can be reduced accordingly. Further, since the peak of the kneading load at the time of feeding the kneading material can be lowered, a dust collector having a small capacity is sufficient.

Further, according to the method of the present invention, the kneading material is charged into the mixer at the speed calculated at the time calculated based on the experimental result of the standard mixing so that the kneading material can be kneaded most efficiently and uniformly. Therefore, the kneading time can be shortened and the generation of cement balls can be avoided as compared with the conventional case in which the kneading material is charged without using such prior data.

Further, when the gate of the gravel weighing device is jogged as in the conventional case, energy for the jogging operation is required, but according to the method of the present invention,
Even if such a jogging operation is not performed, the throwing rate of the gravel can be accurately controlled as described above, so that it is not necessary to consume extra energy for the jogging operation.

In the cement weighing device of the weighing devices, when the cement is discharged, the gate is once fully opened from the initial closed state, and then the gate is narrowed by a predetermined amount to control the discharge amount of the cement. Even if the cement is tightened by its own weight near the discharge port, the cement near the discharge holes can be easily discharged by fully opening the gate. Will be easier.

If a metering device having a gate opening / closing drive mechanism capable of stopping the gate for opening / closing the discharge port at any intermediate position is used, the mixer opening / closing position can be adjusted by the gate opening / closing drive mechanism. It is possible to freely control the input amount and the input time of the material to be added to the unit.

By the way, in the batcher plant, especially in the aggregate measuring device, it is not realistic to stop the gate at an intermediate position, so the gate is configured to stop at either a fully open position or a fully closed position. It is usually done. In such a case, by using the weighing device according to claims 4 and 5 of the present invention, which is provided with a discharge control mechanism capable of adjusting the opening area of the discharge port near the discharge port opened and closed by the gate, the gate is fully opened. Since it is possible to change the opening area of the discharge port at this time, it is possible to freely control the amount and time of the aggregate to be introduced into the mixer per unit time.

When the metering device according to claim 6 of the present invention is used as the metering device for water, first, when the valve mechanism is driven to open the discharge port, the water surface is lowered and the weir is formed. The water in the device is discharged as primary water to the mixer until it reaches the same height, and then when the lower part of the weir is driven to separate it from the peripheral edge of the discharge port, the remaining water in the device becomes secondary water. It is discharged to the mixer. Therefore, the water can be divided into the primary water and the secondary water and charged into the mixer by one metering device. Moreover, in this metering device, since the amount of primary water can be adjusted by changing the height of the weir, it is possible to freely control the optimal amount of input water for primary kneading.

[0026]

Embodiments of the present invention will be described below. First, a schematic configuration of a batcher plant used in this embodiment will be described with reference to FIG.

As shown in the figure, the batcher plant 1
Is a sand use storage bin 4 and a sand storage bin 5 into which the gravel and sand carried in by the belt conveyor 2 are respectively introduced via the turn chute 3, and a cement that stores the cement carried in by other means not shown. Storage bin 6, a water tank 7 for storing water, and a gravel weighing device 8, a sand weighing device 9, and a cement weighing device provided below the storage bins 4 to 6 and the water tank 7 so as to correspond to each other. 10 and a water metering device 11, a mixer 12 for kneading materials provided below the device, and a concrete hopper 13 provided below the device. Then, the materials corresponding to them are put into the respective weighing devices 8 to 11 from the respective storage bottles 4 to 6 and the water tank 7,
After weighing with each of the weighing devices 8 to 11 so that they have a predetermined composition, each of the weighed materials is put into the mixer 12 and kneaded. It is designed to be put into the mixer car 14. The mixer 12 is a two-axis mixer configured such that two kneading shafts arranged in parallel inside thereof are rotationally driven in opposite directions by a motor to knead kneading materials. Is used.

Next, the measuring devices 8 to 11 will be described in more detail. 2 to 4 are gravel weighing devices 8 (the same applies to sand weighing devices 9, so only the gravel weighing device will be described below), FIG. 5 is a cement weighing device 10, and FIGS. 6 to 9 are water weighing devices. 11 are shown respectively.

The gravel weighing device 8 shown in FIGS. 2 to 4 is a hopper 20 provided in a suspended state by a member (not shown).
Have. The hopper 20 has an upper end 21 opened, a discharge port 22 provided in the lower portion, and is formed in a tapered shape so that the horizontal cross-sectional area decreases from the upper side to the lower side.

At the lower part of the hopper 20, a gate 23 for opening and closing the discharge port 22 is swingably attached using a pin 24, and a drive cylinder 25 for driving the gate 23 to open and close is provided. . Also, the hopper 20
A horizontal shaft 27 having both ends supported by brackets 26, which are fixed to the outer surfaces on both sides of the horizontal shaft 27, is rotatably provided around the axial center of the lower part of the outer surface of the horizontal shaft 27. An extending rocking plate 28 is integrally attached so that it can rock around the coaxial 27. Furthermore, the hopper 20
An electric cylinder 30 connected to the end of the horizontal shaft via a link 29 is fixed to the outer surface of the.

Then, as shown by the solid line in FIG.
The gravel (not shown) put in the hopper with the discharge port 22 at 0 closed by the gate 23 is weighed, and then the gate 23 is opened as shown by the chain line in the figure to measure the gravel after the weighing. Is discharged from the discharge port 22 and is charged into a mixer below (see FIG. 1). In this case, the amount or rate of gravel to be fed can be adjusted by the rocking plate 28. That is, the electric cylinder 30 is linked to the link 2
The horizontal shaft 27 is rotated via 9 and the swing plate 28 integrated with the horizontal shaft 27 is swung about the horizontal shaft 27 as shown by the chain line in FIG. 4 to adjust the opening area of the discharge port 22. , It is configured so that the feeding rate of gravel can be controlled.

On the other hand, the cement measuring device 10 shown in FIG.
Also has a hopper 40 provided in a suspended state by a member not shown. The hopper 40 has an opening 40a at the center of the upper end, and a discharge port 42 that is opened and closed by a cone-shaped cone gate 41 at the lower end, and extends downward from the middle portion in the height direction. It is formed in a tapered shape so that the horizontal cross-sectional area becomes small.

A bracket 43 is fixed to the ceiling surface of the hopper 40, and an arm 44 is swingably attached to the bracket 43. An upper end of a rod 45 having a cone gate 41 attached to the lower end is connected to one end of the arm 44, and a pneumatic positioning cylinder 46 fixed to the outer surface of the hopper 40 is connected to the other end of the arm 44. Piston rod 46a is connected. The pneumatic positioning cylinder 46 swings the arm 44 to vertically move the cone gate 41 through the rod 45 to open and close the discharge port 42. In that case, the piston rod 46 of the pneumatic positioning cylinder 46 is used.
By controlling the protrusion amount of a and stopping the cone gate 41 at an arbitrary intermediate position, the cement feeding speed from the hopper 40 to the mixer (see FIG. 1) can be adjusted.

Further, the water metering device 11 shown in FIGS.
The hopper 50 having the upper end 50a opened and the discharge port 51 at the lower portion is provided in a suspended state by a member (not shown), and a cylindrical height variable provided inside the hopper 50 so as to surround the discharge port 51. Of the weir 52 and a valve mechanism 53 that opens and closes the discharge port 51, and two long attachment members 54 and 55 are provided on the upper edge of the hopper. A cylinder for adjusting the height (hereinafter referred to as a height adjusting cylinder) 56,
This is a configuration in which a valve mechanism 53 and a cylinder (hereinafter, referred to as an opening / closing cylinder) 57 that drives the weir 52 to open and close the discharge port 51 are fixed to each other.

The weir 52 is composed of a tubular portion 52a whose lower end is separable from and into contact with the peripheral edge of the discharge port 51, and an expandable bellows portion 52b connected to the upper end thereof. Of these, the tubular portion 52a forms a plurality of projecting pieces 52c from the inner surface thereof toward the inside, and has an inner tubular portion 52d fixed inside by the projecting pieces 52c. Further, the other end 58b of the first link 58 whose one end 58a is swingably attached to the inner peripheral surface of the hopper is connected to the upper end of the bellows portion 52b.
Then, the second link 59 is provided at an intermediate portion of the first link 58.
Through the piston rod 56 of the height adjusting cylinder 56
a is connected, and both the first and second links 58,
The height of the weir 52 can be adjusted by expanding and contracting the bellows portion 52 b by the height adjusting cylinder 56 via 59.

The upper end of the valve mechanism 53 is connected to the piston rod 57a of the open / close cylinder 57 via the connecting member 60, and the lower end of the valve mechanism 53 is located directly below the discharge port 51 through the inner cylindrical portion 52d of the weir 52. A rod portion 53a, and a valve 53b attached to the lower end side of the rod portion 53a to open and close the discharge port 51. Here, the connecting member 6
On the lower surface side of 0, a spring receiving member 61 fitted to the outer peripheral side of the rod portion 53a is provided, and the tubular portion 52a is placed between the spring receiving member 61 and the projecting piece 52c in the weir 52. A spring 62 for urging is provided.

When water is measured, the valve 53b is pressed against the peripheral edge of the discharge port 51 by the pressing force of the spring 62 as shown in FIG.
From this state, by moving the rod portion 53a upward and opening the valve 53b, the water in the hopper 50 is discharged as primary water until the water surface position becomes substantially equal to the height of the weir 52 as shown in FIG. The valve 5 is provided at the lower end of the inner tubular portion 52a.
3b is brought into contact with the valve 53b and the rod portion 5
As shown in FIG. 9, weir 52 is raised by raising 3a.
Is raised to move away from the peripheral portion of the discharge port 51, whereby the water remaining in the hopper 50 is discharged as secondary water. In addition, the control of the discharge rate of the primary water and the secondary water is performed by the valve 5 from the peripheral portion of the discharge port.
3b and the weir 51 by adjusting the amount of rise, in other words, the piston rod 5 in the opening and closing cylinder 57.
This is done by adjusting the stroke of 7a.

Next, a method of charging the kneading material into the mixer 12 according to this embodiment, which is performed by using the batcher plant 1 described above, will be described. In carrying out the method of the present invention, first, the kneading materials such as gravel and cement are most efficiently and uniformly kneaded, and the kneading load of the biaxial mixer 12 is leveled. A predetermined time and speed at which the kneading material should be fed from each of the measuring devices 9 to 11 to the mixer 12 are determined in advance according to the mix and volume of concrete to be mixed. Such work is performed by each measuring device 9-
The kneading material can be fed from 11 to the mixer 12 at various timings, speeds, amounts, and the like, and the difference in the kneading state and the kneading load in the mixer 12 can be examined. The predetermined kneading material charging timing and charging speed thus obtained are stored as data in a storage unit or the like in a control device (not shown) of the plant.

Next, in the actual production of ready-mixed concrete, of the data obtained in advance, the data of the predetermined kneading material charging time and the charging speed corresponding to the mix and volume of the concrete to be manufactured are used. The gate opening / closing timing and the opening degree of each of the weighing devices 9 to 11 are controlled so that the kneading material is fed into the mixer 12 from each of the weighing devices 9 to 11 according to the data.

That is, each of the weighing devices 9 to 11 is operated as follows so that the material is charged into the mixer 12 at a predetermined speed at a predetermined time obtained in advance.
First, gravel weighing device 8 (same for sand weighing device 9)
In the above, the opening area of the discharge port 22 is adjusted by changing the angle of the rocking plate 28 by the hydraulic cylinder 30, and the gate 23 is opened and closed by the drive cylinder 25 at a predetermined time. Further, in the cement weighing device 10, the cone positioning gate 41 is moved downward by the pneumatic positioning cylinder 46 at a predetermined time to be fully opened, and then the cone gate 41 is lifted to a predetermined position to squeeze the cone gate 41 to close the discharge port 42. The opening area, that is, the opening degree is adjusted. Furthermore, in the water metering device 11,
First, the valve 53b is opened by a predetermined amount by the opening / closing cylinder 57 to discharge the primary water at a predetermined speed, and then the weir 52 is moved up to a predetermined position to discharge the secondary water at a predetermined speed.

According to such a method, each of the measuring devices 9 to 1 is based on the data obtained in advance as the kneading material charging timing and speed at which the kneading load of the mixer 12 is leveled.
By controlling the opening / closing timing and the opening degree of the gate in FIG. 1, the kneading load of the mixer 12 when the kneading material is fed from each of the weighing devices 9 to 11 to the mixer 12 is more equalized than in the conventional case. It is possible to set the power of 12 low. That is, when manufacturing the same amount of ready-mixed concrete, it is possible to use a mixer that consumes less power than conventional. As a result, it is possible to reduce the power consumption of the mixer and the abrasion of each part of the mixer, and the running cost can be reduced accordingly. Further, since the peak of the kneading load at the time of feeding the kneading material can be lowered, a dust collector having a small capacity is sufficient.

Furthermore, since the kneading material is charged into the mixer 12 at a predetermined speed at a predetermined time which is obtained in advance as the material to be kneaded most efficiently and uniformly, it is based on such prior data. As compared with the conventional case in which the kneading material is added without the need for kneading, the kneading time can be shortened, and the generation of cement balls can be avoided by the uniform kneading.

Further, according to this embodiment, by adjusting the opening degree of the gate in each of the weighing devices 9 to 11 on the basis of the result of the experiment in advance, the mixer 12 for the gravel is also adjusted.
Since the feeding speed to the gravel can be controlled accurately, the gate jogging operation that was conventionally performed to reduce the kneading load of the mixer in the conventional gravel weighing device is not required, and the extra energy required for such jogging operation is consumed. You don't have to.

Further, when the cement is discharged from the cement measuring device 10, the cone gate 41 is once fully opened from the initial closed state, and then the gate 41 is narrowed by a predetermined amount to control the discharge amount of the cement. By doing so, even if the cement is tightened by its own weight in the vicinity of the discharge port 42, it is possible to easily discharge the cement in the vicinity of the discharge holes by fully opening the cone gate 41. Moreover, the subsequent adjustment of the cement discharge amount can be easily performed by stopping the cone gate 41 at a required intermediate position.

Further, in the gravel weighing device 8, although the gate 23 is stopped at either the fully open position or the fully closed position, the opening area of the discharge port 22 when the gate is fully opened is determined by the swing plate 28. Since it can be changed, it is possible to freely control the amount and time of the gravel to be added to the mixer 12 per unit time.

Further, in the water metering device 11, first, the valve 53b is raised to open the discharge port 51 by a predetermined amount, thereby discharging a predetermined amount of water as primary water and charging it into the mixer 12 at a predetermined speed. Since the weir 52 is separated from the peripheral portion of the discharge port 51 by a predetermined amount, the remaining water is discharged as secondary water to the mixer 12,
It is possible to divide water into primary water and secondary water by a single metering device and to inject the water into the mixer 12 at a predetermined rate by a predetermined amount. Moreover, in the water metering device 11, the weir 52
Since the amount of primary water can be adjusted by changing the height of the water, the amount of primary water and secondary water to be added to the mixer 12 can also be freely controlled.

[0047]

As described above, according to the present invention, the kneading load of the mixer at the time of feeding the kneading material is leveled, whereby the power of the mixer can be set low, and as a result, the mixer power can be set low. It is possible to reduce power consumption and wear of each part of the mixer, and it is possible to reduce running costs. Also, since the peak value of the kneading load can be lowered by leveling the load,
As for the dust collector, a small capacity will suffice.

Furthermore, since the kneading material is fed into the mixer at an optimum time and at an optimum speed according to the mix and volume of concrete, not only the mixing time in the mixer can be shortened but also the occurrence of cement balls is avoided. can do.

Further, as for the gravel, since the feeding speed can be controlled accurately, it is not necessary to jog the gate at the time of feeding, and the energy consumption can be reduced accordingly.

Further, when the cement is discharged from the cement measuring device, the gate of the device is once fully opened from the initial closed state, and then the gate is narrowed by a predetermined amount to control the discharge amount of the cement. Therefore, even if the cement is tightened by its own weight near the discharge port, the cement in the vicinity of the discharge holes can be easily discharged, and the subsequent adjustment of the cement discharge amount becomes easy.

As described above, according to the present invention, when producing ready-mixed concrete in a batcher plant, the kneading material having a predetermined composition can be uniformly and efficiently kneaded in a short time, so that the cost can be reduced. In addition to the above, it is possible to solve problems such as an increase in the kneading load, which is an obstacle to the enlargement of the plant.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an overall configuration of a batcher plant used in an embodiment of the present invention.

FIG. 2 is a front view showing a gravel (sand) measuring device provided in the plant.

[Figure 3] Similarly, a side view

4 is a partial cross-sectional view taken along the line AA of FIG.

FIG. 5 is a vertical sectional view showing a cement weighing device provided in the plant.

FIG. 6 is a vertical sectional view showing a water measuring device provided in the plant.

FIG. 7 is a partial vertical cross-sectional view showing a state of the water metering device when the metering is completed.

FIG. 8 is a partial vertical cross-sectional view showing the state when the primary water is discharged in the same manner.

FIG. 9 is a partial vertical cross-sectional view showing the state of the secondary water when it is discharged.

[Explanation of symbols]

1 ... Batcher plant 8, 9 ... Aggregate measuring device (8 ... Gravel measuring device, 9
・ ・ ・ Sand metering device 10 ・ ・ ・ Cement metering device 11 ・ ・ ・ Water metering device 12 ・ ・ ・ Concrete mixer 23, 41, 52, 53b ・ ・ ・ Gate (41 ・ ・ ・ Corn gate, 52 ・ ・ ・Weir, 53b ... Valve 22, 42, 51 ... Discharge port 27-30 ... Discharge control mechanism (27 ... Horizontal axis, 2
8 ... Oscillating plate, 29 ... Link, 30 ... Hydraulic cylinder) 44, 45, 46 ... Gate opening / closing drive mechanism (44 ...
・ Arm, 45 ... Rod, 46 ... Pneumatic positioning cylinder) 52 ... Dam 53 ... Valve mechanism

Claims (6)

[Claims] 1. In a batcher plant for producing ready-mixed concrete, a kneading material charging time and a charging speed at which the kneading material is most efficiently and uniformly kneaded and the kneading load of the concrete mixer is leveled are obtained in advance for a standard mixture. Depending on the mix and volume of concrete to be produced, the timing and speed at which the kneading material should be fed from each measuring device to the concrete mixer is calculated by the calculation unit of the control device,
Kneading into a concrete mixer characterized by controlling the opening / closing timing and opening degree of the gate in each measuring device so that the kneading material is fed into the concrete mixer from each measuring device at the calculated speed at the calculated time Material input method. 2. The method for adding a kneading material to a concrete mixer according to claim 1, wherein the measuring device for cement among the measuring devices, when the cement is discharged, once fully opens the gate and then squeezes the discharged amount of the cement. A method for feeding a kneading material into a concrete mixer, which is characterized by controlling. 3. A metering device used in the method for charging a kneading material into a concrete mixer according to claim 1, wherein the gate opening / closing drive mechanism can stop the gate for opening / closing the discharge port at an arbitrary intermediate position. A weighing device comprising: 4. A measuring device for aggregate used in the method for charging a kneading material into a concrete mixer according to claim 1, wherein the opening area of the discharge port is in the vicinity of the discharge port opened and closed by a gate. A metering device, characterized in that it is provided with a discharge control mechanism capable of adjusting the. 5. The discharge control mechanism includes a horizontal shaft provided on the outer surface of the weighing device so as to be located above the discharge port, and is separated from the discharge port by swinging about the horizontal shaft. The weighing device according to claim 4, further comprising: a swing plate that can be brought into contact with the swing plate and a drive unit that swings the swing plate. 6. A measuring device for water used in the method for charging a kneading material into a concrete mixer according to claim 1, wherein the device has a gate inside thereof as means for constituting a gate.
A vertically movable valve mechanism that opens and closes the discharge port, and a variable height weir that is provided so as to surround the valve mechanism and the discharge port and that can be brought into and out of contact with the peripheral portion of the discharge port are provided. The metering device is configured so that the amount of primary water discharged from the device can be adjusted by changing the height of the weir.