JP6960809B2 - Granule transport system - Google Patents

Description

The present invention relates to a powder or granular material transport system for transporting powder or granular material such as cement stored in a cement silo to a batcher plant as a ready-mixed concrete manufacturing apparatus.

Conventionally, for example, a batcher plant as a ready-mixed concrete manufacturing apparatus manufactures ready-mixed concrete by kneading materials such as gravel (coarse aggregate), sand (fine aggregate), cement, water, and an admixture.

In the batcher plant, each material such as cement is transported by each transport facility and temporarily stored in each storage bottle provided in the batcher plant main body. For example, aggregates such as gravel and sand are transported from an aggregate silo to a batcher plant using a conveyor and stored in an aggregate storage bottle. Further, the cement is transported from the cement silo to the batcher plant via a transport pipe and stored in a cement storage bottle (see, for example, Patent Document 1).

FIG. 6 is a schematic configuration diagram showing a conventional powder or granular material transport system. The powder or granular material transport system transports cement stored in a cement silo to a cement storage bottle in a batcher plant using compressed air as a transport medium sent from a blower such as a blower.

In the powder or granular material transport system, a plurality of cement silos 51 in which a plurality of types of cement are stored are provided. The cement stored in each cement silo 51 is discharged to the transport pipe 53 by the rotary feeder 52 provided in the lower part of each cement silo 51. A blower 54 is connected to the base end of the transport pipe 53, and the extreme end of the transport pipe 53 extends to the batcher plant 55 and is connected to each cement storage bin 56 in the batcher plant 55.

The cement in the transport pipe 53 is conveyed to the batcher plant 55 through the transport pipe 53 by the compressed air sent from the blower 54, and is supplied into each cement storage bin 56. A bug filter 57 for separating cement and compressed air is provided on the upper portion of each cement storage bin 56. The separated cement is stored in the cement storage bin 56 by the bag filter 57, while the separated compressed air is released into the atmosphere (inside the batcher plant 55 body).

As shown in FIG. 7, the bug filter 57 is composed of, for example, a main body 59 having a plurality of cylindrical filters 58 formed of a filter cloth, and a lid member 60 having a wiping device (not shown). The wiping device is a device for wiping the cement adhering to the peripheral surface by intermittently and pulsedly blowing compressed air onto the filter 58. In FIG. 7B, reference numeral 61 indicates an discharge port from which the separated compressed air is discharged.

As described above, the bug filter 57 has a wiping device, but in many cases, the cement adhering to the peripheral surface of the filter 58 cannot be completely wiped off even by the wiping device. Therefore, in reality, as shown by the arrow D in FIG. 7B, the maintenance worker manually removes the filters 58 one by one from the main body 59 and removes the cement adhering to each filter 58. It has been.

However, one bug filter 57 is provided with about 20 to 30 filters 58, and in the removal operation, these filters 58 are taken out one by one from the bug filter 57, and the adhered cement is removed from the filter 58. Since it is removed from the peripheral surface, it is a very troublesome and time-consuming work. Further, the above removal work is performed at, for example, a landing (floor) provided inside the batcher plant 55, and when the cement adhering to the filter 58 is removed, cement dust is blown up and the environment is harsh. It was work.

Further, the bag filter 57 is relatively expensive because it is accompanied by a wiping device, and the conventional powder or granular material transport system is costly because the bag filter 57 is provided for each cement storage bin 56. It was.

Japanese Unexamined Patent Publication No. 2006-334838

The present invention has been conceived under the above circumstances, and an object of the present invention is to provide a powder or granular material transport system having a structure that is easy to maintain and has a simple structure.

The powder or granular material transport system provided by the present invention is provided for each of a plurality of powder or granular material silos for storing a plurality of types of powder or granular material and the plurality of powder or granular material silos, and the powder or granular material is provided. A plurality of transport paths for transporting the powder or granular material stored in the silo to a ready-mixed concrete manufacturing apparatus that manufactures ready-mixed concrete, a blower that sends compressed air to each of the plurality of transport paths, and the plurality of transport paths. A plurality of cyclones provided in the ready-mixed concrete manufacturing apparatus corresponding to the road and for separating the powder or granular material contained in the compressed air sent by the blower from the compressed air, and the plurality of cyclones. Correspondingly, it is separated by the cyclone contained in a plurality of storage bins each provided in the ready-mixed concrete manufacturing apparatus and storing the powder or granular material separated by the cyclone, and the air released from each of the cyclones. A collection means having a filter for further collecting the missing powder or granular material, and a movement for moving the powder or granular material collected by the collection means to a concrete mixer for kneading the raw material of the ready-mixed concrete. It is characterized by having means and.

In the powder or granular material transport system of the present invention, the moving means may be moved to the outside of the ready-mixed concrete manufacturing apparatus by changing the moving direction of the powder or granular material collected by the collecting means.

In the powder or granular material transport system of the present invention, the detecting means for detecting the accumulated amount of the powder or granular material collected by the collecting means and the moving means based on the accumulated amount detected by the detecting means. It is preferable to further provide an opening / closing means for opening / closing the connecting path to the.

In the powder or granular material transfer system of the present invention, each of the cyclones is connected to the collection means by a transfer pipe for transferring the air released from them, and each of the transfer pipes is bent in a chevron shape. It is good that it is formed.

According to the present invention, the powder or granular material transported by compressed air as a transport medium is separated from the compressed air by a cyclone and stored in a storage bottle. Since the cyclone is easy to configure and basically maintenance-free, it is possible to provide a powder or granular material transport system with significantly improved maintainability as compared with the conventional configuration.

It is a figure which shows the schematic structure of the plant equipment including the powder or granular material transfer system which concerns on this invention. It is a figure which shows the schematic structure of the batcher plant. It is a perspective view which shows an example of a cyclone. It is a figure for demonstrating the action of a cyclone. It is a schematic perspective view which shows the connection state of a cyclone and a collection device. It is a figure which shows the schematic structure of the conventional powder or granular material transfer system. A conventional bug filter is shown, (a) is an external perspective view, and (b) is a schematic view showing an internal configuration.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

FIG. 1 is a diagram showing a schematic configuration of a plant facility including a powder or granular material transfer system according to the present invention. In this powder / granular material transfer system, for example, powder / granular material such as cement stored in a cement silo is transported to a cement storage bin provided inside a batcher plant as a ready-mixed concrete manufacturing apparatus by using compressed air as a transport medium. Is what you do.

The powder or granular material transport system includes, for example, a plurality of cement silos 1 for storing a plurality of types of cement. Examples of the plurality of types of cement include ordinary cement, blast furnace cement, and early-strength cement. In the present embodiment, the powder or granular material to be transported is not limited to cement, and may be, for example, fly ash or other powder or granular material.

A silo bug filter 2 is provided above each cement silo 1. The silo bag filter 2 is for separating the cement pumped by, for example, a pumping wheel (not shown) from the air. The cement separated by the silo bag filter 2 is stored in the cement silo 1, while the separated air is released into the atmosphere.

A rotary feeder 3 is provided below each cement silo 1. The rotary feeder 3 quantitatively discharges the cement stored in each cement silo 1 to a transport pipe 4 described later. The rotary feeder 3 is outlined by a rotor 5 having a plurality of blades for adjusting the amount of cement discharged, a geared motor 6 for rotationally driving the rotor 5, and a butterfly valve 7 for opening and closing the discharge gate (not shown). It is configured. In the geared motor 6, the rotation speed of the rotor 5 can be changed by inverter control.

A blower 8 is connected to the base end of the transport pipe 4. The blower 8 sends compressed air for transporting cement to the cement storage bin 15 to the transport pipe 4. As the blower 8, for example, a roots type blower or the like is used.

The transport pipe 4 is branched into three on the way and is connected to each rotary feeder 3. Each transport pipe 4 connected to the downstream side of each rotary feeder 3 extends to the batcher plant 11. Further, the transfer pipe 4 is provided with a switching valve 9 in front of the rotary feeder 3. The switching valve 9 is switched so as to supply the compressed air from the blower 8 to the transport pipe 4 connected to any of the rotary feeders 3.

Each transfer pipe 4 is connected to a plurality of cyclones 10 in the main body of the batcher plant 11. The cyclone 10 is for separating cement and compressed air conveyed by the transfer pipe 4 by utilizing the principle of centrifugation. The separated cement is supplied to and stored in the cement storage bottle 15 described later. The cyclone 10 can collect powders and granules having a particle size of, for example, 5 μm or more.

Here, the batcher plant 11 will be briefly described with reference to FIG. It should be noted that FIG. 2 shows the storage bin 15 and the concrete mixer 18 in an overlapping manner as compared with FIG. The batcher plant 11 as a ready-mixed concrete manufacturing apparatus is an apparatus for producing ready-mixed concrete by, for example, kneading gravel (coarse aggregate), sand (fine aggregate), cement, water, an admixture and the like.

The batcher plant 11 includes a belt conveyor 12 for transporting, for example, aggregates from a storage silo (not shown) for storing aggregates such as sand and gravel. The aggregate carried by the belt conveyor 12 is distributed to the plurality of aggregate storage bins 14 by the turn head 13. Further, as shown in FIG. 1, the cement is supplied from the cement silo 1 to the cement storage bin 15 by a powder or granular material transfer system.

The sand and gravel stored in the aggregate storage bin 14 are weighed by the aggregate measuring instrument 16 and charged into the concrete mixer 18 via the aggregate charging chute 17. The cement stored in the cement storage bin 15 is weighed by the cement measuring instrument 19 and charged into the concrete mixer 18 via the cement charging chute 20.

Further, the water stored in the water storage bin 21 is mixed with the admixture in the water measuring instrument 22, the total amount of water and the admixture is measured by the water measuring instrument 22, and the concrete mixer 18 is passed through the water input pipe 23. Is thrown into.

Materials such as gravel, sand, cement, water and admixtures charged into the concrete mixer 18 are kneaded in the concrete mixer 18 to become ready-mixed concrete. The ready-mixed concrete is transported to the construction site by an agitator vehicle (not shown) or the like via a concrete hopper 24 provided under the concrete mixer 8 and a hopper gate 25 that can be opened and closed.

FIG. 3 is a perspective view showing an example of the cyclone 10 shown in FIG. The cyclone 10 has a substantially cylindrical main body 31 whose lower portion is narrowed in a conical shape. The main body 31 has an air inflow pipe 32 formed along the peripheral surface of the upper side surface thereof. Although the air inflow pipe 32 is not shown, it communicates with the above-mentioned transport pipe 4, and compressed air containing cement flows into the air inflow pipe 32. A cement collection port 33 through which the separated cement passes is formed at the lower end of the main body 31. A connecting pipe 34 is connected to the cement collecting port 33, and the connecting pipe 34 is connected to the cement storage bin 15.

A tubular air discharge pipe 35 is formed above the inside of the cyclone 10, and the compressed air separated from the cement is discharged to the outside through the air discharge pipe 35. The air discharge pipe 35 is connected to the transfer pipe 36, and the transfer pipe 36 is connected to the collection device 37 described later.

Here, the action on the cyclone 10 will be described with reference to FIG. The compressed air containing cement that has flowed in from the air inflow pipe 32 travels in a spiral shape and descends along the inner peripheral surface of the main body 31 (see arrow A in the figure). Then, the compressed air containing cement is separated in the vicinity of the cement collection port 33, and while the cement falls downward from the cement collection port 33 (see arrow B in the figure), the compressed air rises and the air discharge pipe. It is discharged to the outside through 35 and the transfer pipe 36 (see arrow C in the figure).

Returning to FIG. 1, the transfer pipes 36 extending from each cyclone 10 are integrated into one transfer pipe 36 and connected to a collection device 37 provided in the batcher plant 11. The collection device 37 is for collecting cement that has not been separated by each cyclone 10. The collecting device 37 collects cement by the same principle as the bug filter 57 shown in the [Background technology] column. That is, a plurality of filters (not shown) are provided inside the collection device 37, and the cement not separated by each cyclone 10 is collected by these plurality of filters.

In addition, although each transfer pipe 36 is described in FIG. 1 so as to extend horizontally from above each cyclone 10 in the middle of rising, each transfer pipe 36 is bent into a mountain shape as shown in FIG. The transfer pipes 36 may be connected to each other in front of the collection device 37. If each transfer pipe 36 extends horizontally, for example, when the air blown from the blower 8 weakens or stops, the cement stays in the transfer pipe 36 and hardens in the transfer pipe 36, which hinders the transfer of cement. However, if each transfer pipe 36 is formed in a chevron shape, the possibility of hindering such transfer can be reduced.

Here, since the cement collected by the collection device 37 is released from each cyclone 10, a plurality of different types of cement are mixed in the collection device 37. Since the mixed cement cannot be used when producing ready-mixed concrete of product specifications, it is used, for example, when producing poorly mixed concrete. Alternatively, it is discharged as waste to the outside of the batcher plant 11.

A connecting pipe 38 is connected to the lower end of the collecting device 37, and a hopper 39 is connected to the connecting pipe 38. The hopper 39 temporarily accumulates the mixed cement, and an on-off valve 40 that can be opened and closed is connected to the lower part of the hopper 39. A screw conveyor 41 that can rotate forward and reverse is connected to the downstream side of the on-off valve 40. A concrete mixer 18 is connected to one outlet of the screw conveyor 41 via a connecting pipe 42. Further, a connecting pipe 43 extending to the outside of the batcher plant 11 is connected to the other outlet of the screw conveyor 41.

With the above configuration, when the on-off valve 40 is opened and the screw conveyor 41 rotates in the forward rotation direction, for example, the cement temporarily accumulated in the hopper 39 is removed by the screw conveyor 41 on the concrete mixer 18 side (in FIG. 1). It is sent to the right). On the other hand, when the screw conveyor 41 rotates in the reverse direction, for example, the cement is delivered by the screw conveyor 41 to the outside of the batcher plant 11 (to the left in FIG. 1).

Next, the operation in this powder or granular material transfer system will be described.

When the cement stored in any of the cement silos 1 is transported to the batcher plant 11, first, the switching valve 9 provided in the transport pipe 4 corresponding to the cement silo 1 is opened, and the blower 8 is driven. As a result, compressed air is sent from the blower 8 to the transport pipe 4. Further, the rotor 5 of the rotary feeder 3 connected to the cement silo 1 is rotationally driven by the geared motor 6, and the butterfly valve 7 is opened, so that the cement stored in the cement silo 1 is released. It is discharged to the transport pipe 4.

In this case, the rotation speed of the rotor 5 is adjusted by the inverter control of the rotary feeder 3 so that the cement from the cement silo 1 is quantitatively discharged to the transport pipe 4. As a result, the amount of the cement discharged is adjusted, and the compressed air is sent out from the blower 5, so that the cement is conveyed to the batcher plant 11 through the transfer pipe 4.

When the compressed air containing cement transported toward the batcher plant 11 through the transfer pipe 4 reaches the cyclone 10 of the batcher plant 11, the cement and the compressed air are separated in the cyclone 10 as shown in FIG. , The separated cement is supplied to the cement storage bin 15 via the connecting pipe 34.

On the other hand, the compressed air separated by the cyclone 10 is sent to the collecting device 37 via the transfer pipe 36. In the collection device 37, the cement not separated by the cyclone 10 is separated from the compressed air. Since the on-off valve 40 on the downstream side of the collecting device 37 is closed in the normal state, cement is temporarily accumulated in the hopper 39.

As described above, different types of cement separated by each cyclone 10 are mixed and accumulated in the hopper 39. When poorly mixed concrete is produced using these cements, the on-off valve 40 is opened and the screw conveyor 41 is rotated in the forward rotation direction. As a result, the poorly mixed cement is sent to the concrete mixer 18 side, which is one end of the screw conveyor 41, and is sent to the concrete mixer 18 via the connecting pipe 42.

On the other hand, when the cement accumulated in the hopper 39 is discarded, the on-off valve 40 is opened and the screw conveyor 41 is rotated in the reverse direction. As a result, the cement for disposal is sent to the opposite side of the concrete mixer 18 which is the other end of the screw conveyor 41, is sent to the outside of the batcher plant 11 via the connecting pipe 43, and is transported by a dump truck or the like. Will be abandoned.

As described above, according to the present embodiment, the cement transported by the compressed air as the transport medium is separated from the compressed air by the cyclone 10 and stored in the cement storage bin 15. As described above, since the cyclone 10 is easy to configure and basically maintenance-free, it is possible to provide a powder or granular material transport system with significantly improved maintainability as compared with the conventional configuration.

That is, the bug filter 57 used for separating compressed air and cement in the conventional configuration is obtained by manually removing the filters 58 one by one from the bug filter 57 as described in the [Background Art] column. Troublesome work for removing the cement adhering to each filter 58 was required, and cleaning took a long time. Further, the cleaning work of the bug filter 57 is performed in, for example, a landing in the batcher plant 11, and is a work in a poor environment such as dust flying.

However, in the present embodiment, since the cyclone 10 is used instead of the bug filter 57, it is not necessary to perform the cleaning work itself. Therefore, it is not necessary to perform the troublesome and long-time work for cleaning the bug filter 57, and it is not necessary to perform the cleaning work in a bad environment.

Further, the conventional bug filter 57 is relatively expensive because it is provided with a pay-off device, but by adopting an inexpensive cyclone 10 which is easy to configure, the cost can be significantly reduced. ..

Further, since the conventional bug filter 57 has a corresponding size and is provided for each storage bin 15, a large installation space is required. However, if the cyclone 10 of the present embodiment is adopted, the cyclone 10 of the present embodiment is adopted. , The installation space can be significantly reduced.

In the above embodiment, a collection device 37 is provided on the downstream side of each cyclone 10, but since this collection device 37 collects cement that has not been separated by the cyclone 10, it is a filter. The amount of cement adhering to is significantly reduced. In addition, the cement to be adhered is also used for, for example, discarded concrete, which is not originally produced so much. Therefore, it is not necessary to perform the cleaning work frequently, and the burden on the maintenance worker can be reduced.

Further, according to the powder or granular material transport system of the present embodiment, cement for poor compounding can be produced by supplying from each cyclone 10, so that it is a wasteful material when intentionally producing poorly compounded concrete from the beginning. Can be reduced.

In the above embodiment, when the poorly mixed cement or the waste cement is produced, the cement mixed in the hopper 39 is temporarily accumulated, but the accumulated amount may be automatically detected. .. That is, the hopper 39 is provided with a detection unit (not shown) as to whether or not the mixed cement reaches a certain accumulated amount, and it is detected by the detection unit that the mixed cement reaches the accumulated amount. In this case, the on-off valve 40 may be automatically changed from the closed state to the open state.

Thereby, for example, it is possible to detect that the amount of cement mixed in the hopper 39 has reached a certain amount, and for example, by rotating the screw conveyor 41 in the reverse direction, the mixed cement can be automatically discarded. can.

The scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, the form, size, quantity, structure, etc. of each member in the above embodiment are not limited to the above embodiment, and the design can be changed as appropriate. For example, in the above embodiment, since the cyclone 10 can collect powders and granules having a particle size of, for example, 5 μm or more, the powder or granular material transport system is used for the purpose of collecting such powders and particles. In some cases, the collection device 37 may not be provided on the downstream side of the cyclone 10.

1 Cement silo 3 Rotary feeder 4 Conveyor pipe 8 Blower 9 Switching valve 10 Cyclone 11 Batcher plant 15 Cement storage bottle 18 Concrete mixer 36 Transfer pipe 37 Collection device 39 Hopper 40 On-off valve 41 Screw conveyor

Claims (4)

Multiple powder / granular material silos that store multiple types of powder / granules,
A plurality of transport paths provided corresponding to the plurality of powder or granular material silos and for transporting the powder or granular material stored in the powder or granular material silo to the ready-mixed concrete manufacturing apparatus for producing the ready-mixed concrete.
A blower that sends compressed air to each of the plurality of transport paths, and
A plurality of cyclones provided in the ready-mixed concrete manufacturing apparatus corresponding to the plurality of transport paths and for separating powders and granules contained in the compressed air sent by the blower from the compressed air.
A plurality of storage bottles each provided in the ready-mixed concrete manufacturing apparatus corresponding to the plurality of cyclones and storing powders and granules separated by the cyclones, and a plurality of storage bottles.
A collection means having a filter for further collecting the powder or granular material contained in the air released from each cyclone and not separated by the cyclone.
A moving means for moving the powder or granular material collected by the collecting means to a concrete mixer for kneading the raw material for producing ready-mixed concrete.
A powder or granular material transport system, characterized in that it is provided with. The means of transportation is
Wherein by changing the moving direction of the collected particulate material by collecting means is moved to the outside of the raw concrete production apparatus, granular material conveying system according to claim 1. A detection means for detecting the accumulated amount of powder or granular material collected by the collection means, and
An opening / closing means for opening / closing a connection path to the moving means based on the accumulated amount detected by the detecting means, and an opening / closing means.
The powder or granular material transport system according to claim 1 or 2 , further comprising. Each of the cyclones is connected to the collection means by a transfer pipe that transfers the air released from them.
The powder or granular material transfer system according to any one of claims 1 to 3 , wherein each transfer pipe is formed by being bent into a mountain shape.

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