JPH0849211A - Additive silo in asphalt plant - Google Patents

Abstract

PURPOSE:To provide an additive agent silo which can narrow a plane installation space, and reduce the number of transporting trucks from a manufacturing plant to an installing site, and shorten its assembling term. CONSTITUTION:An air force feed device such as an ejector 4 and a force feed blower 5 for supplying powder and grain to an asphalt plant is provided in an additive silo body 1 for storing the powder and grain used as raw material, and a transfer route such as air force feed pipes 6-1, 6-2 is additionally provided inside or outside the silo body 1. When various devices are arranged in this way, an installation space can be saved in comparison with a transfer device composed of a usual screw conveyor and a bucket elevator, and moreover since the air force feed pipes 6-1, 6-2 can be freely bent and installed in a plane space, the additive silo dispenses with a wide plane installation area, and its installation position can be freely set up.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an additive silo equipped with a powder and granular material transferring device in an asphalt plant.

[0002]

2. Description of the Related Art Generally, asphalt mixture is a crushed stone whose particle size is adjusted, a liquid asphalt heated to a high temperature, and a predetermined amount of stone powder that improves the adhesion between the crushed stone and the asphalt. Is manufactured by

In recent years, in addition to aggregate and asphalt and stone powder in such an asphalt plant, powder for coloring such as iron oxide and slaked lime for the purpose of improving road scenery and improving flexibility, A method of adding granules is used.

In supplying the additive consisting of such powder or granular material, conventionally, an additive silo is individually provided, and a large amount of the additive is stored in the silo, and if necessary, in the silo. The required amount of additive is taken out from and supplied to the mixer of the asphalt plant.

FIG. 3 is a front view showing an additive supply system in a conventional asphalt plant. 21 is an additive storage silo, 22 is an exhaust dust collecting bag filter provided on the upper surface of the silo 21, and 23 is a screw feeder. Reference numeral 24 is a bucket elevator, and 25 is a charge hopper that supplies an additive to a weighing machine 26 provided above the mixer.

The additive filled in the silo 21 falls from the lower end of the silo 21 by gravity and is transferred to the bucket elevator 24 by the screw feeder 23. Further, it is transferred to the upper part by the bucket elevator 24 and transferred from the uppermost part to the charge hopper 25. Next, it is supplied from the charge hopper 25 through the weighing machine 26 to a mixer (not shown).

[0007]

As described above, conventionally, the additive is transferred by the screw feeder 23 for horizontally moving the additive and the bucket elevator 24 for vertically transferring the additive.
, And a large installation space is required to install these devices. Moreover, when installing an asphalt plant, the additive silo is completed in the manufacturing factory and transported by truck or trailer. Further, the screw feeder 23 and the bucket elevator 24 are transported separately from the additive silo because of the size limitation of the truck bed.

FIG. 4 shows an assembling procedure of the conventional method.
21 is an additive silo, 22 is a bag filter, 23-a is an additive elevator lower casing, 23-b is an additive intermediate casing, 23-c is an additive upper casing, 23
-D is an additive upper chute, 23-f is an additive elevator bucket chain, 23-e is an additive upper casing 2 when assembling the elevator bucket chain 23-f
It shows that it is not connected to 3-c. 23-g is an additive elevator lower chute, 24 is a screw conveyor,
Reference numeral 25 indicates a charge hopper.

These are transported in individual states (separated states) in consideration of the size of the bed of the transportation truck and the assembly order. In the case of a standard device, about three trucks are required for transportation.

As for the order of assembly, a bag filter 22 is attached to the additive silo 21 to form an integrated additive silo. Next, the additive elevator parts 23-a, 2
3-b, 23-c, 23-d, 23-g are connected and built in a predetermined position. Next, the bucket chain for additive bucket elevator 23-f is inserted from the upper portion of the bucket elevator, and wound around the foil at the lower portion of the additive elevator lower casing 23-a to connect the portions 23-e. Next, the screw feeder 24 connects the outlet part of the lower part of the additive silo and the lower part of the additive elevator chute 23-g. During this time, it takes about 3 days.

As described above, in the conventional structure, several trucks are required to transfer the members from the manufacturing plant to the site, and the transported additive silo 21, screw feeder 24, and bucket elevator 23 are assembled. There was a problem that it took time to work.

Therefore, the problems to be solved by the present invention are an additive silo which can reduce a planar installation space, reduce the number of transportation trucks from a manufacturing plant to an installation site, and shorten an assembling period. To provide.

[0013]

In order to solve the above-mentioned problems, the additive silo of the present invention comprises an additive silo body for storing powder or granules used as a raw material for an asphalt plant, and the powder for the asphalt plant. It is provided with an air pressure feeding device for feeding granules, and is provided with a transfer path inside or outside the silo body. The term “asphalt plant” used herein includes not only a plant that uses ordinary new aggregate but also a recycling plant that reuses used asphalt.

[0014]

[Operation] The air pressure feeding device uses the flow of air from the pressure feeding blower, and the ejector can be used to feed the additive made of powder or granules into the air to transfer it inside the air pipe. The space is smaller than that of a transfer device using a conveyor or a bucket elevator, and since the air pipe can be freely bent and installed, the transfer route can be freely set without requiring a large planar installation area.

Further, a pressure blower is installed in the additive silo, and an air pipe serving as a transfer route of the additive is installed in the additive silo or close to the silo, so that a blower from a production factory to a plant construction site is installed. The number of transport trucks will be reduced, and the assembly period at the plant construction site can be shortened.

[0016]

EXAMPLES The present invention will be specifically described below based on examples applied to an asphalt plant. FIG. 1 is a front view showing an additive supply system of an asphalt plant. 1
Is a silo for storing additives such as stone powder, iron oxide, and slaked lime, which has a funnel-shaped silo main body 1b in a cylindrical casing 1a and a dust collecting bag filter 2 on the upper part. 3 is an opening / closing device provided at the discharge port at the lower end of the silo body 1b,
Further, an ejector 4 is provided below the opening / closing device 3. Reference numeral 5 is a pressure-feeding blower, which is connected to the rear of the ejector 4 and supplies air for pressure-feeding the additive to an air pressure-feeding pipe 6 connected to the front of the ejector 4 and having a diameter of about 100 mm (depending on the capacity). be able to. The ejector 4 can send the additive made of powder particles that has fallen from the silo body 1b into the air in the air pressure feeding pipe 6. These ejector 4, pressure blower 5
Also, a part of the pressure feed pipe 6 is installed at a position below the silo body 1b, that is, in the casing 1a.

A pressure-feeding pipe 6 which serves as a transfer path for powder and particles.
Passes through the inside of the cylindrical casing 1a, and the silo body 1b
To reach the top of the silo. Further, this transfer path passes through the pressure feed pipe 6-2 fixed to the bracket attached to the outside of the cylindrical casing 1a and the silo body 1b and reaches the upper part of the silo.

After reaching the upper portion of the additive silo 1 in this way, it is provided on the side of the asphalt plant (not shown) via the pressure-feeding pipe 6-3 for the purpose of separating powder, granules and air. It is connected to a small cyclone 7, and the other end of the cyclone 7 is connected to the silo body 1b.
Connection pipe 8 for sending air containing a very small amount of powder or granules
Is connected.

The air pressure feeding pipe 6-3 and the connecting pipe 8 are composed of a plurality of disassembleable pipes, and both ends thereof can be removed.

Below the cyclone 7, a charge hopper 9 for temporarily storing the transferred powder and granular additives is provided, and below the mixer, a mixer 10 is provided.
And a measuring tank 10a are provided.

In the above structure, by operating the opening / closing device 3, the ejector 4, and the pressure-feeding blower 5, the additive stored in the silo main body 1b is forced into the air pressure-feeding pipe 6-.
1 or 6-2 and 6-3, and further through the small cyclone 7 and the charge hopper 9 to be supplied to the weighing tank 10a of the asphalt plant.

Next, the assembling work of the asphalt plant of the above embodiment is carried out in the following manner. FIG. 2 is a diagram showing an assembling procedure in the case of the present invention. In the figure, the bag filter 2
The silo main body 1 and the pressure feed pipes 6-1, 6-2 and 6-3 can be separated and joined by a flange or the like.

Although the size of the bed of the transportation truck is limited, the pressure feeding pipe 6-3, the connecting pipe 8, the bag filter 2 and the small cyclone 7 are small in shape and not bulky, so that they can be used together with the additive silo 1. It can be loaded on a truck. That is, the number of transportation trucks is only one.

The assembly sequence is such that the bag filter 2 is attached to the additive silo 1 to form an integrated additive silo. Next, the cyclone 7 is attached to the upper part of the charge hopper 9. Then, the air pressure feeding pipe 6-3 and the connecting pipe 8 are attached. This work will be completed in one day.

If the additive transfer device for the asphalt plant according to the present embodiment is incorporated into the additive silo and the transfer path is arranged close to the inside or outside of the additive silo, the additive silo can be obtained. , Space saving compared to conventional screw conveyors and transfer devices using bucket elevators.

In the above embodiment, the one having one silo for storing the additive is described, but the present invention is not limited to this, and the silo having two or more silos is provided. Of course, it is also applicable.

At this time, a pressure-feeding pipe having a pressure-feeding blower at the base end is connected in series, and an ejector is provided at the outlet of each silo. Further, since the pressure-feeding pipe can be freely bent and installed, it does not require a large installation area on a plane and has a high degree of freedom in installing the additive silo.

[0028]

As described above, the present invention has the following effects. Saves space compared to conventional transfer devices using screw conveyors and bucket elevators. Since the air pressure feeding pipe can be freely bent and installed spatially, the installation position of the additive silo can be freely set without requiring a large installation area in a plane. It requires less transportation trucks. It only takes a few days to assemble.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is an explanatory view showing an assembling procedure in the embodiment of the present invention.

FIG. 3 is a front view showing a conventional example.

FIG. 4 is an explanatory view showing an assembling procedure in a conventional example.

[Explanation of symbols]

1 additive storage silo, 1a cylindrical casing, 1a
b Silo body, 2 bag filters, 3 switchgear, 4
Ejector, 5 pressure blower, 6 air pressure feed pipe,
7 cyclones, 8 connecting pipes, 9 charge hoppers, 10 mixers, 10a weighing tanks

Claims (1)

[Claims] 1. An additive silo body for storing powder or granules used as a raw material in an asphalt plant, comprising an air pressure feeding device for supplying the powder or granules to the asphalt plant, and inside or outside the silo body. An additive silo characterized in that a transfer path is attached to the.