JP2006334838A - Air transport apparatus for cement in batcher plant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air transport apparatus for cement in a batcher plant, which transports cement to a cement bin from a cement tank by air while cooling the same, and cools and holds the cement in the cement bin at the time of non-transport. <P>SOLUTION: The cement bin 11 is connected to the cement tank 1, which is equipped with a discharge gate 5 with a valve body 6, through a transport pipe 7, a blower 9 is connected to the transport pipe 7 and coolers 10 and 14 are provided to the blower 9 in order to cool compressed air. Then, compressed air is sent into the transport pipe 7 by the blower 9 while cooled by the coolers 10 and 14 and the discharge gate 5 is operated so as to be opened to transport the cement stored in the cement tank 1 to the cement bin 11 by air while discharging the same and operated so as to be closed at the time of non-transport to send only cooling air to the cement bin 11 by the transport pipe 7 so as to cool and hold the stored cement. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an air transportation device for cement in a batcher plant. More specifically, the present invention not only enables air transportation to a cement bottle while cooling cement from a cement tank, but also compressed air cooled when not transported. The present invention relates to an air transport device for cement in a batcher plant that can effectively cool and hold cement stored by blowing into a cement bin.

  In hot concrete, where the daily average temperature exceeds 25 ° C, the hydration reaction of the cement accelerates and the solidification and hardening rate increases, and the slump decreases significantly over time. Not only does this rapidly evaporate, causing cold joints and cracks, but also has problems such as high initial strength but low long-term strength elongation. For this reason, the concrete temperature at the time of placing is determined to be within 35 ° C. (Japan Society of Civil Engineers), and the concrete temperature at the time of unloading is set to 35 ° C. or less (the Architectural Institute of Japan).

  In order to solve the problems of the above-mentioned hot concrete, JP-A-8-309731 (Patent Document 1) discloses that aggregates (sand, gravel) cooled in advance to a predetermined temperature are kneaded with cement and water. A method for producing cooled concrete is disclosed. Japanese Patent Application Laid-Open No. 7-9432 (Patent Document 2) discloses a device for cooling cement, and kneaded the precooled cement together with aggregate and water to produce cooled concrete. Yes. Furthermore, Japanese Patent Application Laid-Open No. 9-314541 (Patent Document 3) discloses an apparatus for cooling kneaded water, and kneaded kneaded water preliminarily cooled together with cement and aggregate to produce cooled concrete. Has been.

By the way, when manufacturing the cooling concrete, means for transporting cement from a cement tank to a cement bin is described in, for example, Japanese Patent Application No. 2004-102406 (Patent Document 4) of the present applicant. As described above, a cement bin is connected to a cement tank via a transport pipe, and the cement is pneumatically transported while the compressed air is blown to the transport pipe by a blower.
JP-A-8-309731 JP 7-9432 A JP-A-9-314541 Japanese Patent Application No. 2004-102406

As described above, conventionally, since the compressed air is blown to the transport pipe by the blower, the cement is pneumatically transported from the cement tank to the cement bin, so that the cement can be transported very efficiently and reliably. .
However, in a hot environment where the daily average temperature exceeds 25 ° C., not only the cement tank is heated and the stored cement is heated, but also the transport pipe is heated and heated, and compressed air as a transport medium is also used. It itself exhibits a high temperature. For this reason, the cement is forced to be pneumatically transported to the cement bottle in a high temperature state. As a result, not only does it adversely affect the production of the cooling concrete, but also when the cement itself is separately cooled. However, the cooling efficiency is poor.

  The present invention solves the conventional problems, and not only can the cement bin be pneumatically transported to the cement bin while cooling the cement from the cement tank, but also the cement can be effectively cooled and held when the cement is not transported. An object of the present invention is to provide a pneumatic transport device for cement in a plant.

  In order to achieve the above object, according to the first aspect of the present invention, a cement bin is connected to a cement tank provided with a discharge gate with a valve body via a transport pipe, and compressed air is blown to the transport pipe. In addition, a blower is connected to the blower, and a cooler is attached to the blower to cool the compressed air. While cooling by the cooler, the blower blows the compressed air into the transport pipe and transports the cement. Sometimes the valve of the discharge gate is opened to allow the cement stored in the cement tank to be discharged and pneumatically transported to the cement bin. When not transported, the valve of the discharge gate is closed and only the cooling air is supplied. The batcher plant is characterized in that it is configured to cool and hold the cement to be stored by blowing it to the cement bin by a transport pipe. That cement air transport system is intended to be subject matter.

  According to a second aspect of the present invention, a rotary feeder is variably provided at the lower end of the cement tank via an inverter control motor so as to adjust the amount of discharged cement appropriately. The gist of the pneumatic transportation device for cement in the batcher plant according to claim 1 is characterized in that.

  According to a third aspect of the present invention, a branch discharge gate with a valve body is branched and formed through a damper to the discharge gate of the cement tank, and the branch discharge gate is branched from a transport pipe. 3. The pneumatic transport device for cement in a batcher plant according to claim 1, wherein the pneumatic transport device is connected to an upper end of a cement tank via a branch transport pipe.

  Since the invention according to claim 1 is configured as described above, compressed air is blown into the transport pipe with the blower while being cooled by the cooler, and the valve body of the discharge gate is opened when the cement is transported. Operate and store the cement tank in the cement tank while discharging the air to the cement bin. When not transporting, close the valve of the discharge gate and blow only the cooling air to the cement bin through the transport pipe and store it. The cement to be cooled can be cooled and, by extension, the cooling concrete can be suitably manufactured.

  Since the invention according to claim 2 is configured as described above, the rotational speed of the rotary feeder can be automatically varied to properly adjust the amount of discharged cement. As a result, the cement can always be efficiently and uniformly cooled.

  Since the invention according to claim 3 is configured as described above, the compressed compressed air is cooled by the blower while switching the damper and opening the valve body to discharge the cement stored in the cement tank from the branch discharge gate. Can be blown to the upper end of the cement tank and pneumatically transferred to the upper end of the cement tank so that the cement stored in the cement tank can be circulated and cooled.

  Hereinafter, the best mode for carrying out the present invention will be described in detail based on an embodiment shown in the drawings.

  FIG. 1 shows a first embodiment of the present invention. In the figure, 1 is a required number of cement tanks installed for storage according to the type of cement, and 2 is at the upper end of each cement tank 1. The attached bug filter 3 is a rotary feeder provided in the lower part of each cement tank 1, and each rotary feeder 3 discharges an appropriate amount of cement from the cement tank 1. The number of revolutions can be varied by a guard motor 4 of inverter control. 5 is a discharge gate provided at the lower end of each cement tank 1, and 6 is a butterfly valve provided at the lower end to open and close the discharge gate 5, and each butterfly valve 6 is arranged outside. It is configured to be opened and closed by an installed air cylinder, actuator (not shown) or the like. 7 is a transport pipe that is branched in a branching manner through a discharge gate 5 so that the cement stored in each cement tank 1 can be pneumatically transported to a cement bin 11 to be described later, and 8 corresponds to each discharge gate 5. In order to cool the compressed air, 10 is a roots type blower connected to the base end of the transport pipe 7, and 9 is between the blower 9 and the transport pipe 7. This is a cold water chiller interposed between the two. In addition, 11 is a cement bin with a required number of bag filters 12 constituting a batcher plant, and each cement bin 11 is connected to a corresponding cement tank 1 via a transport pipe 7.

Next, the operation of the first embodiment configured as described above will be described.
First, the switching valve 8 corresponding to the cement tank 1 to which the cement is to be pneumatically transported is opened, the blower 9 and the cold water chiller 10 are operated, and the compressed air generated by the blower 9 is cooled by the cold water chiller 10. The transport pipe 7 is blown. Next, the rotary motor 3 is variably rotated by starting the guard motor 4 and the butterfly valve 6 is opened, and the cement stored in the cement tank 1 is discharged through the discharge gate 5. Let me. At this time, the rotary feeder 3 is inverter controlled so that its rotational speed can be varied in accordance with the gravity and discharge amount of the stored cement, so that an appropriate amount of cement can always be discharged. I can do it. The cement discharged from the discharge gate 5 is then pneumatically transported to the corresponding cement bin 11 via the transport pipe 7. At this time, since the compressed air, which is the transport medium, is cooled by the cold water chiller 10, the cement can be effectively cooled during the transport.
Similarly, the switching valve 8 is appropriately opened and the rotary feeder 3 and the butterfly valve 6 are operated so that the cement is discharged from the required cement tank 1 and cooled to the corresponding cement bin 11. Let the air transport.

  Conversely, when the cement is not transported, the rotary feeder 3 is stopped and the butterfly valve 6 is closed to stop the cement tank 1 from discharging the cement. Then, only the compressed air cooled through the transport pipe 7 is blown to the corresponding cement bottle 11 to effectively cool and hold the stored cement.

  FIG. 2 shows a second embodiment of the present invention, which differs from the first embodiment in that a cool air chiller 14 is connected to the blower 9 via a connecting pipe 13 to cool the suction air itself. Are the same, and the same reference numerals indicate the same parts.

  In the second embodiment configured as described above, the air cooled by the cold air chiller 14 is sucked into the blower 9, and the compressed air is further cooled together with the cold water chiller 10, and is the same as the first embodiment. It is operated to cool and transport the cement by cooling air and store the stored cement in the cement bin 11.

  FIG. 3 shows a third embodiment of the present invention, which differs from the first embodiment in that a cold air chiller 14 is connected to the blower 9 via a connecting pipe 13 instead of the cold water chiller 10. Are the same, and the same reference numerals indicate the same parts.

  In the third embodiment configured as described above, the air cooled by the cold air chiller 14 is sucked into the blower 9 and blown, and is operated in the same manner as in the first embodiment to transport the cement cooled air. The storage cement in the cement bottle 11 is cooled and held.

  FIG. 4 shows a fourth embodiment of the present invention. A branch discharge gate 15 with a butterfly valve 6 is branched to a discharge gate 5 of each cement tank 1 via a damper 16, Each branch discharge gate 15 is different from the first embodiment in that it is configured to be connected to the upper end of the cement tank 1 itself via a branch transport pipe 17 branched from the transport pipe 7, and the other parts are the same. The same reference numerals indicate the same parts.

  The fourth embodiment constructed as described above operates the blower 9 while switching the damper 16 and opening the butterfly valve 6 to discharge the cement stored in the cement tank 1 from the branch discharge gate 15. Thus, the cooling compressed air is blown and the air is transported while being cooled to the upper end of the cement tank 1 in order, and the cement stored in the cement tank 1 is circulated to be cooled and held. The other operations are the same as in the first embodiment, and the cement is cooled and air-transported to the cement bin 11 while the cement stored by blowing into the cement bin 11 is cooled and held.

  In addition, in the said Example, although the butterfly valve 6 is shown as a valve body, the roots type blower 9 is used as a blower, and the cold water chiller 10 and the cold wind chiller 14 are respectively shown as a cooler, it is not limited to this. Other known ones similar to these can be adopted and used. The present invention can be suitably used for pneumatic transportation of cement in a batcher plant, but can also be applied to pneumatic transportation of other powders.

It is a schematic diagram which shows 1st Example of this invention. It is a partial expansion schematic diagram which shows 2nd Example of this invention. It is a partial expansion schematic diagram which shows 3rd Example of this invention. It is a schematic diagram which shows 4th Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cement tank 3 Rotary feeder 4 Guard motor 5 Discharge gate 6 Butterfly valve 7 Transport pipe 9 Blower 10 Chilled water chiller
11 Cement bottle 14 Cold air chiller
15 Branch discharge gate 16 Damper 17 Branch transport pipe

Claims (3)

  A cement bottle is connected to a cement tank equipped with a discharge gate with a valve body via a transport pipe, and a blower is connected to the transport pipe to blow compressed air, and the compressed air is cooled to the blower. A cooler is attached to allow the compressed air to be blown into the transport pipe with the blower while being cooled by the cooler, and when the cement is transported, the valve of the discharge gate is opened to open the cement tank. The cement to be stored is discharged into the cement bin while it is discharged, and when it is not transported, the valve of the discharge gate is closed and only the cooling air is blown to the cement bin through the transport pipe to keep the stored cement cooled. A pneumatic transport device for cement in a batcher plant, characterized in that A rotary feeder is variably provided at the lower end of the cement tank through an inverter control motor so as to properly adjust the amount of discharged cement. Item 2. A pneumatic transport device for cement in a batcher plant according to item 1.
  A branch discharge gate with a valve body is branched and formed on the discharge gate of the cement tank via a damper so that the branch discharge gate is branched from the transport pipe via the branch transport pipe. 3. The pneumatic transport device for cement in a batcher plant according to claim 1, wherein the pneumatic transport device is connected to an upper end of the cement plant.

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