JPH0852342A - Method and apparatus for controlling transfer of particulate material in particulate mixer plant - Google Patents

Abstract

PURPOSE:To mainly enhance the particulate material feed efficiency of a particulate material supply source and the transfer efficiency of a particulate material from the supply source to a storage container. CONSTITUTION:In a method for controlling the transfer of a particulate material in a particulate material mixer plant wherein a particulate material is sent to a storage container 2 from a supply source 1 and quantitatively supplied to a mixer 8 to be mixed with other material and the resulting mixture is discharged to the outside of the mixer 8, the supply source 1 of the particulate material and the storage container 2 are connected by a pipeline 3 and air sucking force is allowed to act on the supply source 1 on the side of the storage container 2 through the pipeline 3. By this constitution, the particulate material in the supply source 1 is transferred to the storage container 2 under suction and, in such a state that the pressures in both of the storage container 2 and the mixer 8 are kept same by suction force, the particulate material is quantitatively supplied into the mixer 8 from the storage container 2 and the mixing of the particulate material and other material is performed and, after the completion of mixing, the pressure in the mixer 8 is reduced to atmospheric pressure to discharge the treated matter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is to transfer a powder or granular material from a powder or granular material supply source such as a carrier equipped with a tank or a container to a storage container and then supply the powder or granular material to a mixer to supply water to other materials such as water. The present invention relates to a method and an apparatus for controlling the above-described series of transfer of powder and granules in a powder and granular material mixer plant that mixes and discharges the material.

[0002]

2. Description of the Related Art For example, in a granular material mixer plant in which cement carried by a cement carrier is made into cement milk and sent to the site, the granular material (cement) is used.
Is supplied to the mixer from a carrier source through a storage container (eg cement silo), and after mixing,
It is transferred to a predetermined place. The series of transfer of the powder and granules in the powder and granule mixer plant is usually carried out as follows. That is, a pump unit is mounted on a carrier for powder and granules, and a tank or a container for transportation and the storage container are connected by a pipeline, and the powder and granules in the tank are pressure-fed to the storage container. The granular material transferred to the storage container is
By opening the supply pipe line to the mixer, it is dropped by a fixed amount and transferred into the mixer. The processed material that has been mixed with other materials in the mixer is discharged to the outside of the mixer,
It is sent to a predetermined position via the transport path.

Further, there is also adopted a method in which, for example, a flexible container (cement bag) of a cement carrier is lifted by a crane and the cement is dropped into the storage container without connecting the tank of the carrier vehicle and the storage container by a transfer pipe. Sometimes.

[0004]

However, of the above-mentioned conventional methods, the latter requires a crane and its operator, so that the cost tends to be high and the apparatus becomes large-scale.

In the former case, since the pump units for pressure feeding are mounted on the supply source side, respectively, the capacity of the tank for transportation and the like is restricted by the pump unit, and the efficiency of transporting the granular material is deteriorated accordingly. In addition, the above tanks and the like must also be pressure resistant containers. Further, the former cannot measure the supply of granular material in the mixer unless the pressure supply of the granular material from the supply source to the storage container is temporarily stopped when the granular material is quantitatively supplied from the storage container to the mixer. The powder feeding is restarted after the powder is fed to the mixer. Therefore, it takes a long time to transfer the granular material from the carrier to the storage container, and the control management for starting and stopping the pressure feeding is troublesome.

An object of the present invention is to provide a method and apparatus for controlling the transfer of powder or granular material in a powder or granular material mixer plant, which can enhance the efficiency of powder or granular material transportation of a powder or granular material supply source.

Another object of the present invention is to provide a method and apparatus for controlling the transfer of powder particles in a powder particle mixer plant, which is excellent in the transfer efficiency of the powder particles from a supply source to a storage container. It is in.

[0008] Still another object of the present invention is to transfer a granular material in a granular material mixer plant which is easy to control and can be carried out at a relatively low cost without requiring a large-scale device. It is to provide a control method and its device.

[0009]

A feature of the transfer control method of the present invention resides in that the transfer control method according to the present invention has the following structure in order to achieve the above-mentioned object. That is, the method of the present invention is to send the granular material from a supply source to a storage container, to supply a fixed amount of the granular material to the mixer from the storage container, and after mixing the granular material with other materials in the mixer. The present invention relates to a method for controlling the above-described series of transfer of powder or granules in a powder or granule mixer plant discharged to the outside of the mixer. The supply source and the storage container are connected by a transfer pipeline, and by constantly acting an air suction force on the supply source from the storage container side via this pipeline,
The particles in the supply source are suction-transferred to the storage container. The suction force acts on the inside of the storage container and the inside of the mixer while the powder and granules are sent from the storage container into the mixer and during the operation of the mixer, and the internal pressures of the both are maintained at the same pressure. After the mixing is completed, the inside of the mixer is opened to the atmospheric pressure, and the processed mixture is discharged.

In order to achieve the same purpose, the apparatus of the present invention has a powder and granular material supply source such as a powder and granular material carrier vehicle.
A storage container that is in communication with the powder and granular material supply source through a transfer pipe, a mixer that mixes the powder and granular material supplied from the storage container with another material, and the amount of powder and granular material supplied to the mixer. Measuring means, a suction means for vacuum-transferring the powder and granules from the supply source to the storage container, an opening and closing means for opening and closing the supply path of the powder and granules from the storage container to the mixer, and a space in the mixer A balance valve that opens and closes a communication path that communicates with the space inside the storage container, an open valve that releases the pressure in the mixer to atmospheric pressure, and a discharge means that opens and closes the processed product discharge path of the mixer are provided. And
The suction means always performs a suction operation. The opening / closing means of the supply path is opened when the inside of the mixer is empty and the discharge path is closed by the discharging means, while it is closed when the powdered material is quantitatively supplied into the mixer. Further, the balance valve is closed while the opening valve is being opened, and is open otherwise. The opening valve is opened immediately before the discharging operation is completed and the discharging means is opened, and is closed simultaneously with the closing operation of the discharging means.

Further, the device of the present invention may be added with the following configuration. The storage container and the mixer are vertically communicated with each other via the supply path, and the mixer is supported by a load cell as a measuring means. The supply path is connected by a vertically expandable / contractible connecting member, the closed end of the vertically expandable / contractible pressure balance pipe is fixed to the lower part of the mixer, and the other end of the pressure balance pipe is connected to the storage container internal space. Communicate with.

[0012]

When the suction means is operated, the particles are forcibly transferred from the supply source to the storage container through the transfer pipe. At this time, the supply path between the storage container and the mixer is closed. When a certain amount is accumulated in the storage container, the supply channel is opened. Since the inside of the storage container and the inside of the mixer are maintained at the same pressure via the balance valve, the granular material smoothly falls into the mixer without rising.

When a predetermined amount of powder or granules is put into the mixer, the supply passage is closed, and the powder or granules are mixed with other materials which are put into the mixer through another pipe line or the supply passage. Be stirred. When the mixing is completed, the balance valve is closed and the open valve is opened, so that the pressure in the mixer becomes atmospheric pressure. When the discharge path is opened, the processed material in the mixer falls naturally and is discharged to a predetermined transfer pipeline or the like.

During the series of operations, the suction means continues its suction operation. Therefore, when the powder or granular material is transferred from the storage container to the mixer, the powder or granular material is transferred from the supply source to the storage container, and the powder or granular material is always in the storage container except when the supply source is replaced. Guided to enable continuous operation. Moreover, since the powdery particles are transferred to the entire mixer plant under the action of vacuum, the powdery particles are not scattered to the outside.

During operation of the mixer, the suction force also acts on the inside of the mixer, so that the inside is in a decompressed state. As a result, not only the feeding of the above-mentioned other materials into the mixer is performed in a short time without resistance, but also bubbles or lumps are generated due to the inclusion of air, for example, when mixing powder and water. It is difficult to do so and a homogeneous processed product can be obtained.

When the supply path is connected by a stretchable connecting member and the lower part of the mixer supported by the load cell is fixed to the closed end of the stretchable pressure balance tube, the mixer is attracted to the mixer by the suction force of the suction means. Even if a traction force acts in the direction of the storage container, the lower portion of the mixer exerts a pullback force by an equal pressure by the pressure balance pipe, and as a result, the measurement by the load cell can be performed without any trouble.

[0017]

The present invention will be described below in detail with reference to the illustrated embodiments. FIG. 1 is a conceptual configuration diagram of a cement mixer plant to which a method according to an embodiment of the present invention is applied.

In the figure, reference numeral 1 is a cement carrier, and a cement container 1a is mounted on the entire carrier of the cement carrier. Reference numeral 2 is a cement storage silo, and 3 is a cement transfer pipeline that connects the silo 2 and the container 1a.

A vacuum blower unit 4 is connected to one end of a suction pipe 5. The other end of the suction pipe 5 has a silo 2
It is connected to the outflow port 6a of the bag filter 6 attached to the upper part of the above, and the suction force from the vacuum blower unit 4 acts on the transfer pipeline 3 through the internal space of the silo 2. At the bottom of the silo 2 is provided a screw feeder 7 that guides the granular material toward the central opening 2a. A gear motor 7a is a drive source of the screw feeder 7.

Reference numeral 8 is a mixer provided below the silo 2, and the entire weight of the mixer is supported and measured by the load cell 22. A supply passage 9 communicating with the bottom opening 2a of the silo 2 is connected to the supply port 8a formed in the upper portion of the mixer 8. A peripheral wall 9a of the supply passage 9 is formed of a bellows-shaped member and is vertically expandable and contractable. Reference numeral 10 denotes an inflow damper provided in the middle of the supply path 9, which is opened / closed by an actuator 10a. Inflow damper 10
The amount of cement supplied into the mixer 8 by opening and closing is measured by the load cell 9 as the total load of the mixer 8. A discharge port 8b is provided at the bottom of the mixer 8, and a discharge damper 12 that is opened and closed by an actuator 12a is attached to the discharge passage 11 of the discharge port 8b.

The internal space of the mixer 8 and the internal space of the silo 2 can communicate with each other through a communication passage 13. An air introducing pipe 15 is branched in the middle of the communication passage 13,
A three-way valve 14 operated by an actuator 14a is interposed in the three-way passage. This three-way valve closes the air introduction pipe 15 and the internal space of the mixer 8 and the silo 2
The first position for keeping the same pressure state by communicating with the internal space of the mixer and the communication state of the mixer 8 and the silo 2 are shut off, and the atmosphere introducing pipe 15 is opened to let the outside air into the internal space of the mixer 2. The operation is switched to the second position where the fluid flows. When the present invention is carried out, this three-way valve may be provided with two balance valves that open and close at the first position and two open and close valves that open and close at the second position.

At the bottom of the mixer 8 is a pressure balance pipe 16
The closed end 16a of is fixed. Pressure balance pipe 16
The peripheral wall of is formed of a bellows-like member like the peripheral wall 9a of the supply passage 9 and is vertically expandable and contractable. The other open end of the pressure balance pipe 16 communicates with the communication passage 13 downstream of the above-mentioned three-way passage by a pipe passage 17.

In the figure, reference numeral 18 is a stirring blade of the mixer 8, and 19 is a power motor thereof. Reference numeral 20 denotes an injection pipe of water supplied into the mixer 8, a part 20a of which is formed by a bellows-like member, and an opening / closing valve 21 is provided in the middle thereof.

The operating state of the above apparatus will be described. First, before the start of operation, both the inflow damper 10 of the supply passage 9 and the exhaust damper 11 of the mixer 8 are closed, and the three-way valve 14 is in the second position. When the cement carrier 1 arrives at the site, the transfer pipe 3 is connected to the cement container 1a.

In this state, the vacuum blower unit 4
Starts to operate, and the suction force thereof starts to transfer the cement in the cement container 1a into the silo 2. At the same time, the opening / closing valve 21 of the water injection pipe 20 is opened and water is initially supplied into the mixer 8. The stirring blade 18 of the mixer 8 and the screw feeder 7 also start rotating at this point.

When a set amount of water is injected into the mixer, the output signal from the load cell 22 closes the on-off valve 21 to cut off the water supply, and the actuator 14a of the three-way valve 14 operates to operate the three-way valve. 14 is switched to the first position. As a result, the pressure inside the silo 2 becomes equal to that inside the mixer 8, and the pressure balance pipe 1 at the bottom of the mixer 8
6 becomes negative pressure.

Based on the above signal, the actuator 10a of the inflow damper 10 in the supply path 9 is actuated to operate the inflow damper 10
The cement in the silo 2 drops into the mixer 8 through the opening 2a. When the cement and the water in the mixer reach the set weight, the signal from the load cell 22 also closes the inflow damper 10. The suction force from the vacuum blower 4 acts on the mixer 8 to pull up the main body of the mixer 8 to try to extend the bellows-shaped peripheral wall 9a of the supply passage 9 upward, but the same suction force is applied to the pressure balance pipe 1.
6 also acts to pull down the bottom of the mixer 8 in reverse. Since the acting force of both is equal, the weight detection by the load cell can be performed without any trouble.

Since kneading in the mixer is carried out under the above-mentioned reduced pressure, the work is smoothly carried out and the foaming is small,
Also, lumps are less likely to occur. When kneading is completed, three-way valve 14
Is returned to the second position, the discharge damper 12 is opened, and homogeneous cement milk is discharged from the mixer 8 to the outside of the mixer 8. The weight loss of the mixer due to the discharge of cement milk in the mixer is detected by the load cell 22,
The water injection described above is started.

In this way, in the present apparatus, the cement is continuously sucked and transferred from the cement carrier 1 to the silo 2 even when the cement is charged into the mixer 8 from the silo 2 or during the weighing, and the cement mixing process is continuously performed. It is done to.

Although the present invention is applied to a cement mixer plant in the above-mentioned embodiments, the present invention is to store various powders in a storage container and then mix powders into the mixer by mixing them. It can be similarly applied to a granular mixer plant. Further, in the present invention,
The mixer may not be supported by the load cell, but may be a fixed type, and the powder and granules and other materials to be put into the mixer may be measured by another measuring means. When the load cell is used as in the above-described embodiment, the measurement error due to the internal negative pressure is effectively corrected by the upper and lower bellows members.

[0031]

As described above, according to the present invention, since the powdery particles are sucked and transferred from the supply source to the storage container, it is not necessary to mount special equipment for pressure feeding on the supply source side. When the supply source is a transportation vehicle or the like, it is possible to increase the loading amount of the granular material per one time as much as possible and improve the transportation efficiency.

Further, according to the present invention, since the storage container and the mixer into which the powder and granules are charged are placed under a reduced pressure due to the suction action, the powder and granules leak to the outside of the mixer plant or scatter. In addition to eliminating the possibility of dripping, it is easy to add powder and other materials such as water to the mixer, and a homogeneous processed product that is unlikely to cause bubbles or lumps, especially when kneading with water in the mixer Obtainable.

Furthermore, according to the present invention, even when the powder or granules are put into the mixer from the storage container or when the powder or granules and other materials in the mixer are weighed, the storage container is always supplied from the supply source. Since the powdery particles are sucked and transferred, the transfer efficiency of the powdery particles from the supply source is excellent, and the control and control of the transfer are relatively easy, and the cost can be kept low.

[Brief description of drawings]

FIG. 1 is a conceptual configuration diagram of a mixer plant including an apparatus according to an embodiment of the present invention.

[Explanation of symbols]

 1 ... ・ Cement carrier 1a ・ ・ ・ Cement container 2 ・ ・ ・ ・ Cement silo 3 ・ ・ ・ ・ Transfer pipeline 4 ・ ・ ・ ・ Vacuum blower unit 8 ・ ・ ・ ・ ・ ・ Mixer 9 ・ ・ ・ ・ ・ ・ Supply path 10 ... ・ Inflow valve 11 ・ ・ ・ ・ Discharge valve 13 ・ ・ ・ ・ Communication passage 14 ・ ・ ・ ・ Three-way valve 16 ・ ・ ・ ・ Pressure balance pipe

Claims (6)

[Claims] 1. A powdery or granular material is sent from a supply source to a storage container, a fixed amount of the powdery or granular material is supplied from the storage container to a mixer, and the powdery or granular material and other materials are mixed in the mixer, and then the mixer. In the method for controlling the series of transfer of powder and granules in a powder and granular material mixer plant to be discharged to the outside, the supply source and a storage container are connected by a pipeline, and air is supplied from the storage container side through the pipeline. By applying suction force, the powder or granular material in the supply source is suction-transferred to the storage container, and the storage container and the mixer are maintained at the same pressure by the suction force, and then the storage container is moved into the mixer. Powder and granules in a mixer plant, characterized in that the powder and granules are quantitatively supplied, the powder and granules are mixed with other materials, and after the mixing is completed, the inside of the mixer is brought to atmospheric pressure to discharge the processed material. Transfer control method. 2. A powder and granular material supply source such as a powder and granular material carrier, a storage container communicating with the powder and granular material supply source via a transfer pipe, and a powder and granular material supplied from the storage container. A mixer for mixing with other materials, a measuring means for measuring the amount of powder or granules supplied to the mixer, a suction means for vacuum-transferring the powder or granules from the supply source to the storage container, or a mixer from the storage container An opening / closing means for opening / closing the supply path of the powder or granular material, a balance valve for opening / closing a communication path connecting the mixer inner space and the storage container inner space, and an opening valve for releasing the pressure in the mixer to atmospheric pressure. A discharge means for opening and closing the processed material discharge path of the mixer, wherein the suction means always performs a suction operation, and the opening and closing means of the supply path is empty in the mixer and the discharge path is closed by the discharge means. Open when On the other hand, when a certain amount of powder is supplied into the mixer, it closes, the balance valve closes while the open valve is open, and the others open, and the open valve finishes mixing. And the discharge means is opened immediately before the opening operation, and the discharge means is closed at the same time as the closing operation of the discharge means. 3. The powder and granular material transfer control device in the powdery or granular material mixer plant according to claim 2, wherein the storage container and the mixer are vertically communicated with each other via the supply passage, and the mixer is a load cell. Supported, the supply path is connected by a vertically expandable and contractible connecting member, and the closed end of a vertically expandable and contractible pressure balance pipe is fixed to the lower part of the mixer, and the other end of this pressure balance pipe is the storage container. A transfer control device for powder particles, which is in communication with the internal space. 4. The powder and granular material in the powder and granular material mixer plant according to claim 2 or 3, wherein the balance valve and the open valve are integrated to form a three-way valve. Transfer control device. 5. The powder and granular material supply source is a cement carrier, the storage container is a cement silo, and a water supply pipe with an on-off valve is connected to the mixer. 5. The transfer control device for powder or granular material in the powder or granular material mixer plant according to claim 4. 6. The transfer control of the granular material in the granular material mixer plant according to claim 3, wherein both the connecting member and the pressure balance pipe are provided with a bellows-like expandable and contractible connecting portion. apparatus.