JPH042170Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is used in a so-called recycled aggregate plant that manufactures aggregate from pavement waste. This invention relates to a recycled aggregate plant that incorporates a wind classification type dust collection box that removes impurities.

(Prior Art) It is well known that pavement waste materials generated during repair and renovation work of paved roads can be recycled and used. For example, there is a technology in which pavement waste is pulverized using a crusher, and the pulverized material is classified and reused as fine aggregate or coarse aggregate.

(Problem that the invention aims to solve) However, in addition to the asphalt mixture and roadbed material, pavement waste usually contains foreign substances such as branches and leaves of roadside trees and other wood chips.

In particular, the asphalt mixture softens in summer and exhibits adhesive properties, so it contains a larger amount of the above-mentioned foreign substances than pavement waste from concrete pavement.

Therefore, if paving waste containing such impurities is recycled as is, they remain in the obtained recycled aggregate, resulting in a problem that the quality of the aggregate deteriorates.

Conventionally, as a means to solve this problem, the recycled aggregate is soaked in water, and foreign substances such as wood chips contained therein are removed by a so-called flotation method. was.

However, when impurities are removed by such a method, water is absorbed into the recycled aggregate itself during the separation process. Therefore, after separation, the recycled aggregate must be dried to remove water, which is a double effort.

As a result, despite the painstaking reuse,
This double work will increase the regeneration cost,
The drawback was that the economic benefits of reuse were halved.

This invention was devised for the purpose of providing a recycled aggregate plant that eliminates such drawbacks.

In particular, in solving the problem, we aimed to minimize the impact on recycling costs and incorporate a structurally simple removal means that functions extremely efficiently to remove impurities, as follows. Configured.

(Means for solving the problem) First, in existing recycled aggregate plants, pavement waste materials brought in from the generation site are temporarily stored in a stockyard. Therefore, a recycled aggregate plant is equipped with a so-called supply means that sends waste material from its stockyard to a crushing device, a classifier that classifies materials crushed by the crusher according to particle size, and a supply means that sends the crushed material to this classifying device. A storage device consisting of a storage tank or a bottle for storing classified particles according to particle size, and a supply device for feeding thereto. Moreover, these supply means are usually configured such that each of the above-mentioned devices is connected by a conveying device consisting of a conveyor.

Therefore, in this invention, we focused on this point and installed an air classification type dust collection box to remove foreign substances at the rear end of the conveyor that makes up the conveyance device, that is, below the place where the objects to be processed fall. This is because it is configured and incorporated as follows.

First, a dust collection box was provided, which had an inlet for the material to be treated, an outlet immediately below the outlet, an air inlet for classification, and a reservoir for contaminants.

The drop in port of this dust collection box corresponds to the rear end of the transport device, that is, the conveyor, and the lower part of the discharge port corresponds to the upper front end of the next conveyor or the receiving device side. Ta.

Next, the air blowing port for classification was made to correspond to the intermediate side between the dropping port and the discharge port, and a blower was connected thereto.

Furthermore, the foreign matter trapping portion is formed in a pit shape at the bottom of the dust box diagonally below the air blowing port, and at least a portion of both side walls of the dust box are made of wire mesh or the like to provide ventilation. It is characterized by being constructed with materials.

(Function) As explained above, the present invention is applicable to the main equipment constituting a recycled aggregate plant, that is, the crushing equipment, the classification equipment, the storage equipment, and the conveyance equipment that feeds the material to be processed to these main equipment. A dust box is built in between the upper conveyor and the lower conveyor that make up the transport device, so if you operate the blower to send air from the air inlet of this dust box, the dust box will open. Wood chips and other impurities in the workpiece that fall to the lower conveyor side are efficiently classified and removed. Moreover, since the dust box is built into the transport device between each device, by the time the material to be processed is sent to the storage device, which is the final process, impurities are completely removed and high-quality recycled aggregate is produced. becomes.

(Example) Further, the present invention will be specifically explained based on an example shown in the drawings.

First, FIG. 4 is a flow sheet showing an outline of a recycled aggregate plant for recycling general pavement waste material into so-called recycled aggregate.

As shown in this flow sheet, the recycled aggregate plant is installed in a stockyard where pavement waste brought in from the site is accumulated, and the plant consists of a waste material input and supply device 1 and a crushing It is usually composed of a device 2, a classification device 3, a storage device 4 for recycled aggregates sorted by particle size by the classification device 3, and a conveyance device that connects these devices 1, 2, 3, and 4. It is.

Note that the waste material input and supply device 1 shown in FIG.
It is configured as a hopper and is configured to be dropped onto a belt conveyor BC-1 from this hopper 1a. The crushing device 2 uses an impact crusher, and the classifying device 3, which classifies the waste materials crushed by the crushing device 2 according to particle size, has a vibrating sieve.

Further, the final recycled aggregate classified according to particle size by this classification device 3 is sent to a storage device 4 consisting of a cylindrical silo that stores the aggregate according to particle size.

Next, a belt conveyor or a bucket elevator is used as a conveyance device that connects each of these devices 1, 2, 3, and 4.

By the way, BC-1 shown in Fig. 4 is a belt conveyor that transfers waste materials from the waste material input/supply device 1 to the crushing device 2, and BC-2 is a belt conveyor that conveys the materials to be processed that are crushed by the crushing device 2. It is a conveyor belt.

Similarly, BC-3 is this belt conveyor BC-2
Classifier 3 via bucket elevator BE
This is a belt conveyor for feeding the material to be processed into a vibrating sieve.

Note that BC-4 is also a belt conveyor that connects the upper discharge port of the bucket elevator BE and the upper part of the classification device 3.

Below, BC-5, BC-6, BC-7, BC-8 are:
Each is a belt conveyor for conveying the recycled aggregate classified according to particle size by the classifier 3 to the storage device 4, and BC-9 is a belt conveyor for conveying the recycled aggregate classified by particle size by the classifier 3 to the storage device 4. This is a belt conveyor for feedback to 1.

Note that the connections between each device 1, 2, 3, and 4 using these belt conveyors and bucket elevators vary depending on the size of the plant yard, including the paving waste stockyard, and restrictions on the shape of the site. 1, 2, 3, and 4 are connected by connecting several belt conveyors in series. Of course, they may be tied on a single conveyor belt, or they may be tied flat, or they may be tied at an angle. Furthermore, as in the case of feeding to the classification device 3, there are cases where the connection is made by a vertical bucket conveyor.

The present invention provides a recycled aggregate plant having the above-mentioned configuration, in which each device 1, 2, 3, 4 and a conveying device, that is, a belt conveyor BC-1, which connects each device 1, 2, 3, 4, are provided. BC-2, BC-3,
BC-5, BC-6, BC-7, BC-8, and the connection part of the bucket elevator BE, that is, below the position where the recycled aggregate falls, as shown in Figures 1, 2, and 3. A wind-classified dust box 12 was installed. As shown in FIG. 1, the dust collection box 12 has an opening 12a for dropping the material to be treated, specifically, recycled aggregate.
, a discharge port 12b immediately below it, an air blowing port 12c for classification, and a contaminant reservoir 12d.
The configuration has the following. In the embodiment shown in the drawings, the crushed material from the impact crusher is received by a belt conveyor BC-2, and further conveyed by a belt conveyor BC-3 to a classification device 3, that is, a vibrating sieve in the embodiment. It was assembled at the connection between the belt conveyors BC-2 and BC-3. Specifically, the rear end of the belt conveyor BC-2 is made to correspond to the drop in port 12a for recycled materials in the dust collection box 12, the discharge port 12b is made to correspond to the upper front end of the belt conveyor BC-3, and A blower 10 was connected to the air blowing port 12c. Further, the dirt collecting portion 12d in the dust collecting box 12 is formed in the shape of a pit at the bottom of the dust collecting box 12 diagonally below the air blowing port 12c. Both side walls of the dust collection box 12 are constructed with wire mesh 12e.

Of course, this dust collection box 12 is classified by particle size by each device of the recycled aggregate plant, for example, the classifier 3, and then conveyed to belt conveyors BC-5, BC-6, BC.
-7, BC-8, etc. are also provided at the connection points in the process of feeding into the storage device 4, and are provided at least at multiple locations in the recycled aggregate plant. That is, the material to be treated (recycled aggregate) passes through the dust collection box 12 at multiple locations during the treatment process, and in the process, foreign substances such as wood chips and blades of grass are gradually removed by wind power. The structure is designed to allow efficient classification and removal.

Incidentally, reference numeral 11 in FIG. 1 is an outlet for taking out wood chips and other foreign objects accumulated in the collecting portion 12d in the dust collecting box 12 from the dust collecting box 12.

(Effects of the invention) As explained above, the present invention incorporates a wind classification type dust collection box into the transfer process in a recycled aggregate plant, so that it collects contaminants contained in the pavement waste, which is the material to be treated. Objects, i.e. foreign objects such as pieces of wood or blades of grass, are removed in stages. As a result, a recycled aggregate plant incorporating this dust collection box can produce high quality recycled aggregate.

In addition, since the dust box itself has an extremely simple configuration, when it is incorporated as ancillary equipment to a recycled aggregate plant, it can be installed at an extremely low equipment cost, and it can also be easily incorporated into an existing plant. The effect is huge.

[Brief explanation of the drawing]

The drawings relate to an embodiment of the present invention, and FIG. 1 is a perspective view showing the structure of a dust collection box. FIG. 2 is a side view showing a state in which this dust collection box is incorporated into a conveying device consisting of an upper conveyor and a lower conveyor, and FIG. 3 is a plan view thereof. FIG. 4 shows a flow sheet of a conventional general recycled aggregate plant. 1... Pavement waste input and supply device, 2... Crushing device, 3... Classification device, 4... Storage device, BC-1
~9...Belt conveyor, BE...Bucket elevator, 10...Blower, 11...Outlet, 12...Wind-type dust collection box, 12a...
Drop in port, 12b...Discharge port, 12c...Air blowing port, 12d...Reservoir, 12e...Wire mesh.

Claims (1)

[Claims for Utility Model Registration] (1) In a recycled aggregate plant comprising a crushing device, a classification device, a storage device, and a transportation device such as a conveyor connecting these devices, A dust collection box is provided at the location where the transported objects fall, and has a drop-in port for the transported objects, an outlet directly below the drop-in port, an air blowing port for classification, and a collection area for foreign matter in the transported objects. The drop in port of the dust box corresponds to the rear end of the conveyor constituting the transport device, the discharge port corresponds to the upper front end of the next conveyor or to the side of the receiving device, and the air blow port for classification , a blower is connected so as to correspond to the intermediate side between the air inlet and the outlet, and the dirt collection part is formed in a pit shape at the bottom of the dust collection box diagonally below the air inlet. A recycled aggregate plant incorporating an air classification type dust collection box, characterized in that both side walls of the dust collection box are constructed with ventilation walls made of wire mesh or the like. (2) The recycled aggregate plant according to claim 1, wherein the dust collection boxes are installed at a plurality of locations where objects to be treated fall in the recycled aggregate plant. .