KR20150069984A - Concrete waste recycling system and method for recycling sands from concrete wastes - Google Patents

Abstract

In the present invention, disclosed are a waste concrete recycling system and a waste concrete recycling method for recycling sand from waste concrete where waste concrete is injected into a cage type crushing chamber, while pressurized air is sprayed to side wall of the crushing chamber quickly, and an odd number column and an even number column among heating rods in two cyclo columns are rotated in an opposite direction, thereby crashing waste concrete into the heating rod in a high impact energy and crushing the same while making the crushed fall into the lower part of the casing, discharging the same and collecting dust with use of air current in a dust collecting device where members of the cage type crushing chamber are supported by a bearing and accordingly keep rotating in a stable manner; the crushed are pressurized by the pressurized air current and are accordingly divided into at least two groups based on particle weights. Therefore, the crushed can lift due to the pressurized air, when dividing winds, and crash into a distribution plate, thereby enabling only dust to lift and the crushed particle to quickly decrease to an exit.

Description

Technical Field [0001] The present invention relates to a waste concrete recycling system and method for recovering sand from waste concrete,

The present invention relates to a system and a method for recovering waste concrete generated as a result of dismantling a concrete structure with sand. And more particularly, to a waste concrete recycling system and method capable of maximizing production efficiency throughout the regeneration process, thereby reducing costs and improving recycling of recycled sand.

When concrete structures such as buildings and bridges are dismantled, a large amount of construction waste is generated, and the weight of the waste concrete is such that waste concrete occupies about 80-90%. Waste concrete has a diameter of, for example, about 30 to 500 mm, and is usually recycled as industrial waste, buried in a final treatment plant or recycled as a road bed material. It is expected that the amount of waste concrete generated in Korea will increase rapidly from about 15 million tons in 2000 to more than 100 million tons in 2020. Since it is difficult to secure a landfill for reclaiming such a large amount of waste concrete, it is urgently required to develop a recycling technology for waste concrete and to put it into practical use. By recycling the sand contained in the waste concrete, it can contribute to environmental preservation and contribute to the effective utilization of resources.

Recycling of waste concrete is mainly composed of waste concrete being reused as aggregate such as gravel or sand. Conventional techniques for recovering sand from waste concrete have been variously proposed. The raw waste concrete lumps are crushed to a desired size, and the crushed material is classified according to its size and weight. With regard to the pulverization of pulverized concrete and the classification method of pulverized material, it is divided into wet and dry. Wet-milled pulverized material is more harmonious than wet-type pulverized material. However, wet-type pulverization requires water treatment process or equipment, which increases facility and operation cost. The dry type classification is more advantageous in that the drying cost of the pulverized product is unnecessary and the classification can be performed in an accurate manner.

As a representative example of the prior art that discloses dry pulverization and dry classification, Japanese Patent Application Laid-Open No. 2000-263026 (recycling method of waste concrete) can be mentioned. This technique uses a cage-type mill equipped with a striking rod made of ceramics to obtain a pulverized waste compact having a size of about 10 mm or less after crushing the pulverized concrete block to a size of about 40 mm or less (Grinding process), and grinding the obtained pulverized product using a wind force sorter to sort sand and powder (screening process).

This technique uses a cage-type mill having a striking rod made of ceramics as a crushing means for crushing the crushed material to 10 mm or less in particular. 1, the cage-type mill 10 is provided with a casing 31 having an inlet 31 and an outlet 32 for the crushed material (crushed concrete block) and having a protective liner 33 on the inner wall surface 30). In the casing 30, two cage members A and B having different diameters are provided concentrically. Each of the cage members A and B holds a plurality of striking rods 14 and 24 between the rotating disks 11 and 21 and the bands 12 and 22 at equal intervals. The rotary shafts 11a and 21a of the cage members A and B are connected to a drive motor (not shown) using a drive shaft 34. [ Particularly in the cage-type mill (10), the protective liner 33 and the striking rods (14, 24) There is a configuration that the bending strength 20Kg / mm ² or more, a hardness ratio cuzz 1,200Kg / mm ² or more silicon nitride that Veneer ceramics are used.

The pulverization of the pulverized material by the cage-type mill 10 is carried out as follows. When the pulverized material is charged into the casing 30 through the charging port 31 while the cage members A and B are rotated in opposite directions by the driving motor, the pulverized material constitutes the cage member B having a small radius Collides with the first row of striking bars 24 and then collides with the second row of striking rods 14 constituting the cage member A having a large radius of reverse rotation and finally collides with the protective liner 33 . The pulverized material is pulverized by the collision so that the pulverized material has a size of 5 mm or less. The pulverized material obtained by the pulverization is discharged to the outside of the casing 30 through the discharge port 32.

In the conventional cage-type mill 10 described above, when the raw material (pulverized material) is poured into the crushing chamber from the side in a manner that the raw material is poured into the crushing chamber, the raw material is blown outward by the centrifugal force. However, Until reaching the rod, centrifugal force is negligible and gravity (air pressure due to the air flow inside the mill, of course, is negligible, though of course) causes free fall and falls intensively below the crushing chamber. The crushing efficiency is low because the area where the input material collides with the impact rods is locally limited, and accordingly, the amount of the raw material that can be input per unit time is limited. In other words. If the rotational speeds of the cage members A and B are not sufficiently fast, there is a local lamination phenomenon of the charged particles to cause time delay until the impact members 14 and 24 of the stacked particles are brought into contact with each other. It is necessary to limit the amount of the pulverized material charged into the cage mill 10 per hour within a proper amount not to accumulate in the cage member B, thereby lowering the production efficiency of the pulverizing process.

If the feeding rate is higher than the pulverizing speed of the pulverized material, the pulverized material tends to be deposited on the lower side of the cage member B. To alleviate this problem, the rotation speed of the cage members A and B must be very fast. However, this may result in unnecessary power and consumption for high-speed rotation of the cage members A and B, and may result in durability of components due to high-speed operation. As a result, the productivity is deteriorated due to an increase in operation and maintenance costs and shortening of the maintenance period. Further, even if the cage members A and B are rotated at a high speed, the amount of the pulverized material to be charged per hour needs to be sufficient in order to prevent breakage of the pulverization. Therefore, it is an inevitable aspect that the crushed material is stacked in the cage member B.

In particular, it is an important drawback that the conventional cage-type mill 10 has only a gravitational force acting on the feedstock until it collides with the striking rod, so that the impact energy of the feedstock with the first columnar striking rod is not so large. The impact energy will be further reduced if the input material is deposited by injecting an excessive amount after collision with the impact rod. That is, when the pulverized material is accumulated on the lower side of the cage member B even for a short period of time and then introduced into the striking rods 14 and 24, the kinetic energy of the pulverized material decreases as the buffering phenomenon increases due to the lamination phenomenon Collides with the striking rods 14 and 24 in a state where the impact energy is not sufficiently large. As described above, the pulverized material charged into the pulverizing chamber has a weak kinetic energy of its own, is concentrated only into one place, and a sufficient centrifugal force is not applied to the pulverized material rapidly, so that the pulverization of the raw material can not be effectively performed, The problem of degradation occurs. In addition, since the pulverized material which is not sufficiently pulverized enters a large amount between the cage member A and the cage member B, it may interfere with the rotational movement, causing an overload to be applied to the motor serving as the power providing means of the cage members A and B, thereby causing a failure.

In addition, the conventional cage-type mill 10 is structurally weak to handle a large amount of pulverized material. The cage members A and B are coupled to the rotary shafts 11a and 21a in such a manner that the rotary shafts 11 and 21 are connected to the ends of the rotary shafts 11a and 21a connected to the motor drive shaft 34. [ There is no means for directly supporting the cage members A, B. Therefore, the weight of the cage members A and B and the weight of the object to be crushed into the cage members A and B are all caught by the rotary shafts 11a and 21a. 12a to the impact force applied by the articles to be crashed hit the striking rods 14, 24 of the cage members A, B rotating at high speed. If excessive force is applied to the rotary shafts 11a and 12a, the rotary shafts 11a and 12a may become unstable when they are used for a long period of time. However, if any one of the rotating shafts 11a and 12a is warped, the alignment between the striking rods 14 and 24 may be changed according to the design, and the productivity and the quality of the product (pulverized product) may deteriorate.

In order to prevent such a problem, the inspection of the warp of the rotating shafts 11a and 21a, the intervals of the cage members A and B, and the maintenance work cycle are short, resulting in a production loss. In order to prevent such problems, it is possible to consider a method of making the rotating shafts 11a and 21a and the driving shaft 34 sufficiently thick and / or high in strength so as to sufficiently overcome the expected load and the impact force. However, ≪ / RTI >

The cage-type mill 10 does not have an effective discharge structure of dust (fine powder) generated by continuous crushing of raw materials. During the crushing process inside the cage mill 10, the crushed material is pulverized while causing numerous collisions with the striking rods 14 and 24. In addition to the recycled sand of the desired size, smaller dusts are generated in this process. The conventional cage-type mill 10 does not have a separate outlet for dust emission, and does not employ a forced discharge mechanism. The generated dust should escape through the outlet 32. However, in reality, dust that escapes through the discharge port 32 is partly accumulated in the cage-type mill 10. If the amount of dust accumulated in the inside increases, the apparatus may fail, and the ejection efficiency and shape of the pulverized particles may be adversely affected. Therefore, it is necessary to periodically remove dust so that accumulated dust does not exceed a certain amount. Since the machine must be shut down during dust removal, the resulting loss of productivity must also be avoided.

On the other hand, for dry milling, it is necessary to dry the pulverized material well in advance. Particularly, it is necessary to sufficiently dry the pulverized product since the error due to the water content must be minimized to finely separate the pulverized material by the particle size using wind power. The crushed material may contain iron particles, which need to be removed completely before the crushing process. It is advantageous in terms of securing of space and improvement of productivity to simultaneously treat drying and iron removal separately from each other. The above-mentioned prior art does not disclose a concrete method for this.

The resulting product from the cage mill 10 may need to be classified into more than two grades of the desired size, since the size distribution width is rather large. The prior art does not provide a specific classification method in this regard. Appropriate classification methods are required. There is a need for measures to improve the accuracy of classification and increase productivity. Particularly, when the particles are classified according to the weight of the particles by using the wind force, the classification accuracy is lowered if the particles are not sufficiently dried. Therefore, it is necessary to ensure that the pulverized particles are accurately classified through sufficient drying of the pulverized material. In addition, the pulverized material after the pulverizing process contains dust, which must be effectively removed. Classification processes that can accommodate these various demands and that can be harmonized with the preceding process are needed.

SUMMARY OF THE INVENTION The present invention has been made to overcome the problems and limitations of the prior art as described above, and it is an object of the present invention to improve the production efficiency and the operation / maintenance cost of the conventional cement mill, (Hereinafter referred to as " waste concrete recycling system ") and a method capable of efficiently recovering sand from waste concrete that can improve the quality of waste concrete. Specifically, the crushing speed of the crushed concrete mass can be further improved. By introducing a cage support structure for preventing the warping of the rotating shaft and introducing an effective discharge structure of the residual dust generated during crushing, And to provide a waste concrete recycling system and method employing a cage-type mill capable of reducing operation / maintenance costs.

Another object of the present invention is to provide a waste concrete recycling system and a method capable of improving the process performance and increasing the durability of the apparatus by simultaneously drying the waste concrete as the pulverized material and separating and removing the iron pieces contained therein .

In the process of recycling sand from waste concrete, since the pretreatment (drying and metal removal) process, crushing process, and wind power classification process are continuously performed on the pulverized waste concrete, the production efficiency of the whole system is the lowest process speed . It is another object of the present invention to provide a waste concrete recycling system and method that can improve the production efficiency of a pulverizing process having a relatively low processing speed and thereby increase the production efficiency of the entire system.

According to an aspect of the present invention, there is provided a method for disposing a waste concrete pulp in a cage-type crushing chamber enclosed by two or more annular striking rods, The pulverized waste concrete charged into the pulverizing chamber is pushed by the pressurized air to rotate the odd-numbered rows and the even-numbered rows of the pulverizing rods in opposite directions, A grinding device for dropping and discharging the pulverized material to the lower portion of the casing surrounding the pulverizing chamber and discharging the dust to the upper portion of the casing while being loaded on the air stream; And an air classifier for classifying the pulverized material into at least two groups according to the particle weight by applying a pressurized air flow to the pulverized material, wherein a waste concrete recycling system for recovering sand from waste concrete is provided .

In the waste concrete recycling system, the pulverizing apparatus may include a plurality of first striking rods provided on a first support member to be coupled and supported by at least one or more rows in an annular arrangement to provide a grinding chamber on the inner side, A small-diameter cage member joined in the normal direction to the bottom center of the yarn; A plurality of second striking rods are coupled to and supported by the second support member in an annular arrangement of at least one row but arranged alternately with the rows of the first striking rods in a radial direction, A large-diameter cage member having a second rotation axis extending to the second support member; A crushing material input portion for supporting the first and second rotary shafts while containing the large-diameter cage member and the small-diameter cage member and for allowing the pulverized waste concrete for crushing to be poured into the crushing chamber is provided on one side, A casing provided with a pulverized water discharge port to be discharged; And air impinging on the first and second striking rods is injected into the crushing chamber to increase the collision energy with respect to the first and second striking rods, Injection member; And a first drive motor and a second drive motor for transmitting a rotational force through the first rotation shaft and the second rotation shaft to rotate the large diameter cage member and the small diameter cage member so as to rotate in opposite directions, It is preferable that the striking rods and the striking rods of the even-numbered rows are rotated in opposite directions to crush the waste concrete impregnated into the flow of the centrifugal force and the pressurized air.

The pulverized material input part is configured such that the outlet is divided into two parts, and the waste concrete is divided into right and left portions of the first rotating shaft and put into the pulverizing chamber.

Wherein the air injection member includes a body portion provided to surround the first rotation shaft, an intake port provided at one side of the body portion to introduce air pressurized from the outside, a pressurized air introduced through the intake port, And a plurality of injection nozzles provided in the body portion to be ejected toward the rods. In this case, the plurality of injection nozzles may be arranged so that the flow direction of the pressurized air injected from the plurality of injection nozzles is a direction orthogonal to or opposite to the rotational direction of the first thermal striking bars arranged in the innermost row of the crushing chamber .

The casing includes a dust outlet for discharging dust generated in the pulverizing process of the waste concrete pulp to the outside through the air stream; A filter disposed in the casing between the large-diameter cage member and the dust outlet so as to allow dust to pass therethrough but not to allow particles of a predetermined size or more to escape; And a dust collecting device for collecting the dust from the dust-containing air stream flowing through the duct connected to the dust outlet and discharging the purified air stream.

The grinding apparatus may further include a bearing member for rotatably and stably supporting the small-diameter cage member and the large-diameter cage member so as not to be tilted in a direction orthogonal to the first rotation axis and the second rotation axis.

In the waste concrete recycling system, according to an exemplary embodiment, the wind-driven particle classifying apparatus may include a crushing water inlet and a crushed water outlet on two sides, a dust outlet on the upper side, A box structure having an intake port at a low point; A plurality of openings extending from an inlet of the pulverized product to an outlet of the pulverized product, and a plurality of openings arranged in a plurality of rows, plate; The grinding water particles are arranged so as to cover the respective rows above the respective rows of the plurality of openings so as to rise above the openings by the pressurized airflow so that the grinding particles colliding with the grinding water particles drop quickly. ; A vibration generator installed at one side of the box structure to generate a vibrating force to vibrate the wind power classifying plate to cause the pulverized material to be fed onto the wind power classifier through the pulverized material inlet to be conveyed toward the pulverized material outlet; And a first classifier including a blower for supplying pressurized air to the intake port, wherein while the pulverized material on the wind power classifier plate is conveyed toward the outlet by the vibration, the pressurized air supplied by the blower passes through the plurality The powder is pushed upward by pushing up the pulverized material upward to strike the dispersing plate so that the dust is lifted up to the upward flow and escapes through the dust outlet and the pulverized material particles fall down to the wind power classifying plate It is preferable that the pulverized material from which dust has been removed repeatedly is taken out to the pulverized material outlet.

According to another exemplary embodiment, the wind-driven particle classifier further comprises a second classifier having the same structure as that of the first classifier, wherein the second classifier classifies the pulverized material discharged from the outlet of the first classifier into a predetermined class It is preferable to be configured to classify particles heavier than the point and lighter particles. In addition, the above-mentioned dispersion plate is an inverted-V or inverted-U-shaped long plate material, and has a hole in which the direction of the mouth is covered so that the pulverized material particles colliding with the pulverized material particles can advance and fall in the carrying direction, It is preferable to be disposed at an angle to face between the outlets. Wherein the openings are rectangular or slit-shaped openings having a narrow width and a long length, and each of the openings is provided so that the longitudinal direction thereof is orthogonal to the conveying direction, and each row of the plurality of openings is perpendicular to the conveying direction, Are preferably arranged in a zigzag pattern.

According to another embodiment of the present invention, the wind-driven particle classifier comprises a pulverized material inlet for charging the pulverized material to be classified, an inlet port for introducing pressurized air and located below the pulverized material inlet, A box structure provided with a first outlet through which the large particles of the powder to be classified fall off and is taken out, a second outlet for taking out small particles of the powder to be classified and a dust outlet for dust extraction of the powder to be classified; A blower blowing the air pressurized through the inlet port toward the second outlet; And a conveying means disposed at the bottom of the box structure for conveying small particles of the pulverized material flying by the pressurized air falling to the outlet, The particles that are heavier than the first classifying point drop to the first outlet and the dust that is lighter than the second classifying point is loaded on the pressurized air to discharge the pressurized air to the second outlet, It is preferable that particles having intermediate weight between the first classifying point and the second classifying point fall onto the conveying means and are discharged to the second outlet. In this case, the wind-driven particle classifier is disposed above the conveying means, and collides with the pulverized classified material lifted by the pressurized air to cause the particles of the middle weight to fall onto the conveying means, It is preferable to further include a dispersion plate for allowing the air to fly upward.

According to another aspect of the present invention, there is provided a pulverizing apparatus for pulverizing a waste concrete, which pulverizer is disposed in a cage-type crushing chamber surrounded by two or more annular striking rods, And the odd-numbered rows and the even-numbered rows of the striking rods are rotated in opposite directions so that the waste concrete rupture is pushed by the pressurized air to blow the outer row in the inner row, A crushing step of dropping and discharging the pulverized material to the lower portion of the casing surrounding the cage-type pulverizing chamber, and sending the dust to the dust collecting device on the air stream; And a wind type particle sorting step of applying a pressurized air flow to the pulverized material and classifying the pulverized material into at least two groups or groups by particle weight. .

In the waste concrete recycling method, when the waste concrete is crushed into the crushing chamber, it is preferably divided into left and right portions based on the rotation axis at the center of the crushing chamber.

In addition, the air injection from the center to the side wall of the crushing chamber is performed through a plurality of injection nozzles provided in the air injection member disposed in the center of the crushing chamber, and the injection direction of the pressurized air injected from the plurality of injection nozzles Is preferably a direction orthogonal to or reversing the rotational direction of the first row of striking bars arranged in the innermost row of the crushing chamber.

Preferably, the crushing step further comprises the step of providing a dust outlet at an upper portion of the casing to discharge the dust generated in the crushing process through the dust outlet and to be collected by the dust collecting device.

Also, the wind turbine classifying step includes a wind power classifying plate provided with a plurality of openings, and a box structure disposed on the openings and having a dispersing plate disposed so as to advance and advance toward the outlet of the pulverized material, The pulverized material supplied to the wind power classifier plate is conveyed from the pulverized material inlet to the pulverized material outlet by vibrating with a vibration generator installed in the box structure and blowing pressurized air under the wind power classifier plate, So that the dust is allowed to pass through the dust outlet provided above the box structure by being lifted up by the rising air stream, and the pulverized water particles are discharged through the discharge port provided above the box structure, So that the pulverized material from which dust has been removed is repeatedly pulverized by the pulverization To include a first classification step to be taken out of the outlet is preferable. The wind-powered particle classification step is a step in which the pulverized material taken out to the pulverized material outlet in the first-order classification step is subjected to classification treatment in the same manner as in the first-order classification step, And a second classifying step of classifying the particles into lighter crushed water particles. In this case, the openings are rectangular or slit-shaped openings having a narrow width and a long length, and each of the openings is provided so that the longitudinal direction thereof is orthogonal to the conveying direction of the pulverized material, It is preferable that the openings of two rows adjacent to each other are arranged in a zigzag form. The dispersing plate is an inverted-V-shaped or inverted-U-shaped long plate, and the direction of the mouth is such that the pulverized material particles colliding with the pulverized material particles move forward in the carrying direction, As shown in Fig.

In the wind-powered particle classification step, the air pressurized through the inlet port provided below the pulverized material inlet port is blown into the second classifier pulverized material falling freely at the pulverized material inlet of the box structure into the second outlet, The particles larger than the first classification point are discharged to the first outlet disposed below the inlet port and the dust that is lighter than the second classification point is discharged through the dust outlet provided in the upper portion of the box structure, And particles having an intermediate weight between the second classifying points drop onto the conveying means provided below the box structure and are discharged to the second outlet.

According to the present invention, it is possible to maximize the collision energy when the crushed material hits the impact rod by using the wind force when crushing the waste concrete crushed material, thereby increasing the crushing speed and improving the productivity.

In addition, since the dust generated in the pulverization process is removed simultaneously with pulverization, the accumulation of dust in the pulverizer can be minimized. Accordingly, the maintenance and repair cycle of the pulverizing apparatus can be extended.

The structural weakness of the cage-type mill, which is the crushing device, is compensated by introducing bearings, so that stable operation of the cage-type mill can be ensured for a long time.

The present invention also allows the pulverized waste concrete to be dried as a pre-treatment of the pulverizing process, which is compatible with the wind-driven classification of the post-treatment of the pulverizing process. In addition, by simultaneously removing the magnetic substance during the drying of the crushed material, it is possible to prevent the crushing device from introducing the crushed magnetic material pieces to cause the breakdown.

Even when the pulverized product is pulverized by wind, it is possible to classify the pulverized particles into two or more classes depending on the weight, and the classification accuracy can be greatly improved because the pulverized particles are completely dried.

The speed and accuracy of the classification process can be improved by introducing a method in which the pulverized water particles blown onto the pressurized air stream in the classification process collide with the dispersion plate and force the pulverized water particles to fall.

In addition, it is possible to strike the crushed material with the cylindrical rod in the crushing process and to maximize the collision energy by using the wind, thereby improving the shape of the crushed material to the maximum spherical shape. In the following wind turbine classification process, By colliding against the plate, the form can be further improved.

Fig. 1 shows the structure of a crushing apparatus in the form of a cage mill according to the prior art for crushing waste concrete crushed material to 10 mm or less.
FIG. 2 is a process flow diagram illustrating an entire process of a waste concrete recycling system according to the present invention.
3 and 4 are a side view and a cross-sectional view along a cutting line A-A 'showing the construction of a continuous heating furnace for simultaneous heating drying and removal of iron pieces for pretreatment of pulverized concrete waste.
5 illustrates an exemplary structure of a crusher in the form of a cage mill according to a first embodiment of the present invention for crushing waste concrete.
6 is a cross-sectional view taken along line C-C 'in FIG.
Fig. 7 illustratively shows a preferred structure of a cage mill type crushing apparatus according to a second embodiment of the present invention for crushing waste concrete.
FIG. 8 exemplarily illustrates a preferred structure of an air classifier for classifying pulverized waste concrete according to the present invention.
Fig. 9 is a view for explaining the classification mechanism of the wind-driven particle classifying device of Fig. 8;
FIG. 10 exemplarily shows another preferred structure of the wind-driven particle classifier for classifying pulverized waste concrete according to the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, the term " waste concrete pulp " means a waste concrete block having a maximum diameter of about 30-40 mm or less, obtained through a crushing process using a crusher such as a jaw crusher. This is also a raw material of the waste concrete recycling system 50 according to the present invention. The term 'waste concrete pulverized product' is a result obtained by a pulverizing process of pulverized waste concrete using the pulverizing apparatuses 100 and 200 of the present invention, that is, the cage-type mills 100 and 200 for pulverization, Refers to waste concrete particles (debris) pulverized to 10 mm or less, more preferably to about 5 mm or less. It is sorted by size through classification process and recovered as recycled sand.

1. Pretreatment process (heat drying and iron removal)

The present invention relates to a process for treating a waste concrete pulp and recovering it as recycled sand of good quality. FIG. 2 is a flowchart showing an entire process of a waste concrete recycling system 50 for this purpose. The waste concrete recycling system 50 includes a raw hopper 52, a continuous heating furnace 60 for forced drying of the waste concrete waste and removal of the iron material (magnetic material) 60, pulverized waste concrete into small particles having a diameter of 10 mm or less And a particle classifier 300 for classifying the pulverized waste concrete by size by wind to obtain reclaimed sand of a desired size.

When concrete structures such as concrete buildings are dismantled, water is often sprayed to prevent dust from being blown. For these and other reasons, waste concrete may contain moisture. In order to classify the pulverized concrete of waste concrete to be classified according to size, the waste concrete must be sufficiently dried. Waste concrete lumps are dried before comminution. The present invention employs a continuous heating furnace (60) for forced drying instead of natural drying, which requires a yard for drying and has to be dried for a considerable time until it reaches a desired level of water content. To this end, a continuous heating furnace 60 is used for a predetermined amount of pulverized waste material contained in the raw hopper 52.

3 and 4 show a continuous heating furnace 60 according to the present invention. The continuous heating furnace 60 includes a heating furnace 62 extending in a tunnel shape and a supporting structure 67 (for example, a furnace having a height of about 0.8 to 1.5 m, a width of 1 to 2 m, a length of about 5 to 30 m Of the < / RTI > The tunnel type heating furnace 62 is provided with a heat insulating wall 63 formed in a substantially rectangular tunnel shape formed by using a heat insulating material and extending in a long rectangular shape and an inner space surrounded by the heat insulating wall 63 or evenly arranged in the heat insulating wall 63, And a heater (64) heated by energy to heat the inner space to a desired temperature. Exhaust openings 66 are provided in the upper part of the heating furnace 62 at predetermined intervals.

The heating temperature in the heating furnace 62 may be appropriately determined depending on the moisture content of the waste concrete, the length of the heating furnace 62, whether or not air is blown into the heating furnace 62, and the like. Generally, when concrete is heated, part of surplus water, capillary water, adsorbed water and interlayer water in concrete starts to evaporate from water at a low temperature range of about 105 ° C., and the concrete heated to 100-200 ° C., A part of the surplus water, the capillary water, the adsorbed water, and the interlaminar water present in the inside is discharged as water vapor. From about 200 ° C, melting begins at the interface between the aggregate and the cement paste. As the pore pressure inside the concrete rises, the physical properties such as weight loss rate, specific heat and thermal conductivity are significantly lowered, and physical properties at 300 to 400 ° C Lt; / RTI > Excessive heating at high temperatures increases production costs. In consideration of this point, it is preferable that the heating temperature is suitably determined in a range not exceeding 200 占 폚. For example, the heating furnace 62 is divided into three sections: a preheating section for heating to about 80 ° C, a dehydrating section for heating to about 120 to 200 ° C, and a cooling section for lowering the temperature to about 40 ° C. It can be configured in one form. In this case, the preheating section and the dehydrating section are heated using a heater, and the cooling section is air-cooled using the injected air. In order to increase the heating and drying efficiency, it is also possible to inject hot air through the side surface or the lower surface of the heat insulating wall 63 (for example, between the exhaust openings 66) to circulate the hot air inside the heating furnace 62. The operation of the temperature sensor (not shown) and the heater 64 for detecting the internal temperature of the heating furnace 62 is automatically controlled based on the detected value of the temperature sensor to automatically control the internal temperature of the heating furnace 62 to the set temperature value And a heater driving unit (not shown) for controlling the heater driving unit.

The conveying means for supplying waste concrete pulverized material 105 into the heating furnace 62 are separated from each other on the inner bottom wall of the heat insulating wall 63 so as to extend from the inlet 68 of the heating furnace 62 to the outlet 69 A plurality of long elongated rail members 65 are placed on the rail member 65 and passed through the inlet 68 of the heating furnace 62 to the outlet 69 and then backwardly along the lower side of the heating furnace 62 A driving motor 78 provided below the outlet side of the heating furnace 62 as a driving means for driving the conveyor belt 67, And includes a chain sprocket 75 and an integrally connected chain drive roller 74, a pressure roller 76 and a plurality of rollers 79-1, 79-2, 79-3 and 79-4. A chain sprocket is also provided on the rotary shaft of the drive motor 78, and the chain sprocket is connected to the chain sprocket 75 through a chain 71.

A magnetized conveyor magnet roller 72 is attached to the end of the conveyor belt 67 on the side of the heating furnace outlet 69 in order to separate and collect the magnetic iron pieces mixed therein simultaneously with the drying of the waste concrete waste 105. [ Respectively. A partition wall 73 is provided below the magnet roller 72. A crushed material charging portion 80 of the crushing cage-type mill 100 is provided on the outer side of the partition wall 73 and a magnetic material recovery portion 73-1 is provided on the inside thereof. The conveyor belt 67 is preferably made of a non-magnetic material. For example, a mesh belt made of austenitic stainless steel in the form of a mesh can be used as the conveyor belt 67. The use of a mesh belt ensures free flow of heated air above and below the mesh belt, allowing more efficient drying of waste concrete debris. The magnet roller 72 may be composed of an electromagnet or a permanent magnet. The conveyor belt 67 sequentially winds the magnet roller 72, the belt drive roller 74, the pressure roller 76, and the rollers 79-1 through 79-3, and feeds back to the inlet roller 79-4 do.

The heating drying and the magnetic material removing operation of the continuous heating furnace 60 having such a configuration are performed as follows. The chain sprocket 75 is rotated by the motor rotational force transmitted through the chain 71 while the drive motor 78 is operating, whereby the belt drive roller 74 rotates together. At this time, since the pressure roller 76 applies appropriate tension to the conveyor belt 67 wound around the belt drive roller 74, a force is applied to the conveyor belt 67 wrapped around the belt drive roller 74, (67) moves at a constant speed from the inlet (68) toward the outlet (69). While the conveyor belt 67 is moving, the waste concrete waste 105 charged into the inlet 68 is heated and dried through the heating furnace 62. And then falls to the crushing input portion 80 of the cage-type mill 100 for crushing while passing through the magnet roller 72 disposed at the end of the conveyor belt 67. At this time, the magnetic iron pieces mixed in the waste concrete pulverizer 105 are caught by the magnet roller 72 and do not fall toward the pulverizer input portion 80 but go down to the magnet roller 72 and come to the vicinity of the magnetic material collecting portion 73-1 And falls to the lower magnetic material collecting portion 73-1 while being distant from the magnet roller 72. [ Whereby the drying of the waste concrete pulp and the separation of the magnetic iron pieces are carried out continuously at a time.

2. Grinding process

Next, Fig. 5 shows a cage mill 100 which is a milling apparatus according to an example of the present invention. The cage type mill 100 is a structural improvement of the above-mentioned conventional cage type mill so as to obtain an improvement effect such as a productivity improvement and a maintenance cost reduction.

The cage-type mill 100 includes a large-diameter cage member 120 and a small-diameter cage member 130 configured to rotate in opposite directions to each other, and two cage members 120 and 130 Which is a box-like structure for supporting the casing 110. The structure of the two cage members 120 and 130 is similar to that of the prior art.

The small diameter cage member 130 has a small diameter disc 132 that is erected on the opposite side of the crushing member insertion portion 80 provided on the side surface of the casing 110 and a small diameter disc 132 which is concentric with the small diameter disc 132 And an annular first band member 134a surrounding the first small band member 132a and the first small band member 134a at predetermined intervals and a second band member 134b concentric with the first small band member 132 and the first band member 134a, And an annular second band member 134b disposed so as to face each other while facing each other. The small-diameter cage member 130 includes a plurality of first thermal striking rods 136a annularly disposed and spaced apart from each other by a predetermined distance between the edge of the small-diameter disk 132 and the second band member 134b, And a plurality of third row striking rods 136b annularly disposed and spaced apart from each other by a predetermined distance between the first band member 134a and the second band member 134b. A small diameter cage rotation shaft 138 connected to the rotation axis 167 of the second drive motor 165 is connected to the center of the small diameter disk 132 in the normal direction.

The large diameter cage member 120 has a large diameter circular plate 122 concentric with the small diameter circular plate 132 and disposed in parallel to the rear face of the large diameter circular plate 122 and having a larger diameter than the first band member 134a, And annular third and fourth band members (124a, 124b) concentric with and disposed on opposite sides thereof. The third band member 124a has a diameter larger than the diameter of the small diameter disc 132 and has a diameter larger than that of the first band member 134a It has a diameter smaller than the diameter. The large diameter cage member 120 further includes a large number of second thermal striking rods 126a annularly disposed and spaced apart from each other by a predetermined distance between the third band member 124a and the large diameter disk 122, And a plurality of fourth row striking rods 126b which are annularly disposed and spaced apart from each other by a predetermined distance between the member 134b and the large diameter circular plate 122. [ It is preferable to increase the thickness of the portion of the large diameter disk 122 which sandwiches the second row and the fourth striking rods 126a and 126b to enhance the structural stability. The large diameter cage rotation axis 128 connected to the rotation axis 162 of the first driving motor 160 is connected to the center of the large diameter cage 122 in the normal direction. The large diameter cage rotation axis 128 and the small diameter cage rotation axis 138 are concentric. The two rotating shafts 128, 138 are parallel to the striking rods 126a, 126b, 136a, 136b.

According to this configuration, as shown in FIG. 6, the center of the crushing chamber 180 of the cylindrical space surrounded by the first row of striking bars 136a of the small-diameter cage member 130, the first row of the small- And the second row and fourth row damper bars 126a and 126b of the large diameter cage member 120 and the third row damper rods 136a and 136b are alternately arranged alternately. In other words, the first row of striking rods 136a, the second row of striking rods 126a, the third row of striking rods 136b, and the fourth row of striking rods 126b surround the grinding chamber 180, And are disposed in order with a predetermined interval in the radial direction.

The first row hot rod 136a may be formed into a shape in which a metal mandrel is disposed therein and an outer rod made of a material having high hardness and high toughness is wrapped around it and joined together with an adhesive. Both end portions of the metal core bar are inserted and sandwiched between the two members that are exposed and sandwiched (the small-diameter circular plate 132 and the annular second band member 134b in the case of the first row striking rod). It is preferred that the outer rods are made of ceramics such as silicon nitride ceramics, silicon carbide ceramics, alumina zirconia or ceramics, high alumina ceramics, or alloy cast steel such as chromium cast steel. Of these, those made of silicon nitride ceramics have the best characteristics as a striking rod. The same applies to the other impact rods 136b, 126a, and 126b. When the striking rods are formed into a cylindrical shape, they collide with the particles at various angles, which is advantageous for improving the shape of the particles.

In order to increase the productivity of the pulverizing process, the larger the amount of feedstock per unit time is, the better the cage members 120 and 130 are. Heavy loads are applied to the cage rotating shafts 128 and 138 in a large amount during the crushing process and the raw material striking by the striking rods 136a, 126a, 136b and 126b is continuously performed. Therefore, when the cage rotating shafts 128 and 138 are excessively loaded, The cage members 120 and 130 may be deformed in a parallel state and in a gap therebetween. In order to prevent such a problem, the cage mill 100 includes a means for rotatably and stably supporting the cage members 120 and 130 so as not to be inclined or bent in a direction orthogonal to the rotation axes 128 and 128 of the respective cages .

Specifically, a bearing bearing member 142 for housing the bearing 140d and rotatably supporting the large-diameter cage member 120 is fixed to the inner wall of the casing 110 while the large-diameter cage member 120 of the large- 122 and the fourth band member 124b, respectively. The large-diameter cage member 120 can stably rotate in a fixed position and posture for a long period of time by sharing the load applied to the large-diameter gage member 120 by the support member 142. The small diameter disc 132 and the first band member 134a of the small diameter cage member 130 and the large diameter cage member 130 of the large diameter cage member 120 and the small diameter cage member 130, The bearing members 140a, 140b and 140c can also be introduced between the engaging portions of the second row and the fourth row striking bars 126a and 126b of the first and second rows 120a and 120b.

Large amounts of fine dust are generated in the milling process. The cage mill 100 introduces a structure for forcibly discharging dust generated in the crushing process out of the casing 110. Specifically, the crushing water outlet 114 is provided at the lower end of the casing 110 to contain the small-diameter cage member 130 and the large-diameter cage member 120 and to discharge the crushed material (reclaimed sand) And a dust outlet 117 is provided at the upper end thereof so that dust generated in the pulverizing process can be discharged. The dust outlet 117 is connected to a duct 118 for guiding dust to the dust collector 370.

A filter 116 is provided between the dust outlet 117 and the large diameter cage member 120 (for example, at the inlet of the dust outlet 117) to prevent dust particles from passing through the dust outlet 117, . It is preferable that the screen 116 is made of a smooth surface so that the dust does not adhere well. In addition, it is desirable to continuously vibrate the sieve 116 to prevent the dust from sticking. (Not shown) may be further provided between the dust outlet 117 and the dust recovery device 370 so that the speed of the dust-containing airflow can be raised to a desired level for effective forced discharge of the dust. High velocity air flow (to be described later) injected into the crushing chamber 180 also contributes to forced discharge of dust. The superstructure of the casing 110 can be improved to reduce the deposition rate of the dust in the casing 110 so that the dust can be forcedly discharged.

In order to maximize the production efficiency of the crushing process in the cage mill 100, it is necessary to increase the crushing speed of the crushed waste concrete as the crushed material (raw material). If the following conditions are met, the milling speed of the milled material can be significantly increased: (i) the feedstock strikes the striking bar more strongly, (ii) the time it takes for the feedstock to strike the bar is shorter (Iii) The feedstock should be distributed evenly without being concentrated at any particular point. The cage mill 100 introduces a mechanism capable of maximizing the collision energy of the pulverized concrete waste with the use of a high velocity air stream and shortening the collision time. For this purpose, the air injection member 150 is mounted while surrounding it along the small-diameter cage rotation shaft 138. The air injection member 150 is preferably fixed by the casing 110 so as not to rotate. The body portion 152 of the air injection member 150 is provided with a plurality of injection nozzles 154. The body portion 152 is provided with an intake portion 156 which is a passage through which high-pressure air provided by the high-pressure air supply means such as the air compressor 158 can be introduced into the body portion 152. The plurality of injection nozzles 154 are provided so that high-pressure air introduced into the intake unit 156 can be ejected toward the first thermal striking rod 136a constituting the side wall of the crushing chamber 180. The waste air introduced into the crushing chamber 180 through the crushing inlet 80 is pushed by the high speed air stream injected from the injection nozzle 154 to fly toward the crushing rod 136a, Collision.

The pulverizer input portion 80 is connected to the inlet of the pulverizing chamber 180 (the inside of the second band member 134b). It is also advantageous to maximize the impact energy of the pulverized material and to balance the input of the pulverized materials evenly in order to increase the production efficiency of the pulverizing process. For this, as shown in FIG. 6, it is preferable that the outlet of the pulverizer input portion 80 is provided in a double-branched structure so that the raw material is dispersed into both sides of the small cage rotation shaft 138. In this case, the raw material can be uniformly dispersed without locally concentrating and accumulating in one place, and it is possible to shorten the time from the input to the collision with the impact rods. In addition, it is possible to form a strong rotating air stream against the rotation of the first thermal striking rod 136a by injecting the pressurized air jet through the air injection member 150 from both sides, thereby enhancing the collision energy Details will be provided later). It is possible to significantly reduce the amount of material deposited below the crushing chamber 180 even when a larger amount of raw material is supplied per unit time than in the prior art.

At least a part of the injection nozzles 154 are arranged in such a manner that the flow direction of the high speed air stream ejected from the injection nozzles 154 is the same as the direction of the flow of the first hot stabbing rod 136a It is preferable to be provided so as to be at least orthogonal to or opposite to the rotation direction (normal direction). That is, as illustrated in FIG. 6, since the first row of hot stabbing rods 136a, which are the first to collide with the input raw material, rotate in the clockwise direction, the high-velocity air stream ejected from the injection nozzle 154, It is preferable that the directional flow component is injected to form a combined air flow. For example, for raw materials to be fed to the left side of the pulverizer input portion 80, a high velocity air is radially spread (with reference to the small cage rotation axis 138) and an airflow is formed from the second upper limit region to the third upper limit region And the raw material to be injected to the right side of the pulverizer input portion 80 is sprayed so that high velocity air is radially spread and the air is jetted from the fourth upper limit to the first upper limit region so as to form an air flow, .

The grinding mechanism of this cage-type mill 100 for grinding is as follows. By driving the first and second driving motors 160 and 165, the first row and the third row striking rods 136a and 136b rotate in a first direction (e.g., clockwise) The four row striking rods 126a and 126b rotate at a high speed in the opposite direction (for example, counterclockwise). The raw material to be supplied to both sides of the rotary shaft 138 in the crushing chamber 180 through the crushing material injection port 80 is loaded on the air jetted at a high speed from the injection nozzle 154, Due to the jetting direction, it rotates in a direction opposite to the rotational direction of the first row of striking rods 136a and spreads toward the striking rod 136a constituting the sidewall of the crushing chamber 180 to collide. Since the raw material is uniformly dispersed in the crushing chamber 180 and introduced into the crushing chamber 180, the treatment efficiency can be greatly improved and the amount of input raw material per unit time can be further increased. A large part of the input raw materials are incident on the first row of hot striking bars 136a in the reverse direction to the direction of rotation of the first row of hot striking rods 136a and collide with each other. The raw material crushed by the first row of striking rods 136a is further crushed into smaller particles while colliding with the second row of striking rods 126a which are rotating in the opposite direction while being added with centrifugal force. The raw material is further finely pulverized sequentially by the third row and fourth row striking rods 136b and 126b which rotate in this manner while being rotated. The external shape of the striking rods 136a, 126a, 136b, and 126b is a round cylindrical shape, so that the raw material particles are subjected to fracture at different angles. Therefore, the shape of the mold is sequentially improved through the process of crushing. If the inner wall of the casing 110 surrounding the discharge port 114 is provided in an angular form, the particles that have escaped from the fourth row striking rod 126b may travel down the inner wall surface of the angler until they exit the discharge port 114, A rubbing effect is obtained and the shape of the particle becomes better. As a result, the particles crushed with the cage mill 100 have a much better shape than the conventional one.

The four row annular arrangement of the above-mentioned striking rods 136a, 126a, 136b, 126b is exemplary. The striking rods should be arranged in more than two rows, but may be suitably configured according to the required degree of grinding. For example, in the case where the degree of crushing may be weak, it may be arranged in two or three rows, and in the case where the degree of crushing is required to be strong, it may be constituted by five or six rows.

Fig. 7 shows the structure of a cage mill 200 which is a milling apparatus according to another example of the present invention. In Fig. 7, the same numerals as those of the above-described cage mill 100 are given the same reference numerals. The cage mill 200 differs from the cage mill 100 in that the construction of the large diameter cage member 220 and the small diameter cage member 230 is simplified.

Specifically, the small-diameter cage member 230 includes a small-diameter disk 214 that is erected on the opposite side of the crushing-in portion 80 provided on the side of the casing 110, and a small-diameter disk 214 that is concentric with the small- An annular plate member 216 disposed therein, and a plurality of striking rods constituting the first row and third row striking rods 236a and 236b. The annular plate member 216 has a larger radius than the small-diameter disc 214 and is disposed so as to protrude radially beyond the small-diameter disc 214 while partially overlapping the periphery of the small-diameter disc 214. A plurality of first thermal striking bars 236a are sandwiched between the periphery of the small diameter disk 214 and the inner periphery of the annular plate member 216. [ A plurality of third row striking rods 236b are fixedly coupled with the first row striking rods 236a around the outer periphery of the annular plate member 216. [ A separate band member for holding and supporting the third row striking rods 236b is not employed.

The large diameter cage member 220 is concentric with the small diameter disc 214 and is disposed adjacent to the rear face of the large diameter cage member 214 and has a diameter approximately equal to that of the annular plate member 216.) And a plurality of striking rods constituting the thermal striking rods 226a and 226b. A plurality of striking rods arranged in an annular shape along two circumferential edge lines are fixed to the surface of the large diameter circular plate 224 facing the annular plate member 216. The second row of striking rods 226a disposed in the inner annular row is located between the first row of striking rods 236a and the third row of striking rods 236b. And the fourth row striking rods 226b disposed in the outer annular row are located outside the third row striking rods 236b. The large diameter cage member 220 does not separately employ a band member for holding and supporting the second row of impulse bars 226a and a band member for supporting the fourth row of impulse bars 226b.

The rotating shaft 128 coupled to the first driving motor 160 is coupled to the center of the large diameter disk 224 in the normal direction and the rotating shaft 138 coupled to the second driving motor 165 is coupled to the small diameter disk 214 And is extended in a direction opposite to the rotation axis 128. [

The collision energy applied to the first column striking rod 236a is greatest when the waste concrete collides with the waste, and the collision energy is decreased because the particle size becomes small due to the backward heat. Therefore, only the first row of impingement rods 236a that hit the first time with the waste concrete crumbs are held at both ends, and the striking rods 226a, 236b, 226b of the remaining rows are fixed to the annular plate member 216 or the large diameter disc 224 Only one end may be fixedly coupled.

In order to stably support the large diameter cage member 220 and the small diameter cage member 230, it is preferable to introduce the bearing means as in the first embodiment. That is, the bearing member 240a is supported and supported 142 around the outer periphery of the large-diameter disk 224, and the bearing member 240b is disposed and supported around the outer periphery of the annular plate member 216 142).

The remaining configuration of the cage mill 200 is the same as the cage mill 200 of the first embodiment. For example, the air injection member 150 is disposed at the center of the crushing chamber 180 while surrounding the rotation shaft 138, the dust outlet 117 is provided at the upper side of the casing 110, And the waste concrete wastes are supplied to the left and right sides of the rotary shaft 138. The air blowing member 150 is then supplied with pressurized air to the waste concrete wastes to be charged, , 236b, 226b are maximized, and so on. Therefore, the crushing mechanism is substantially the same as that of the first embodiment.

When pulverized waste concrete is crushed using the cage-type mills 100 and 200, large sand having a particle diameter of 10 mm or less and small sand having a particle diameter of 0.075 to 0.15 mm which satisfy the particle distribution condition of the reclaimed sand for concrete are included . A considerable amount of the fine powder of 0.075 mm or less is sent to the dust collecting device through the dust outlet 117 during the pulverization process and is collected and a small amount of the fine powder is discharged through the discharge port 114. The pulverized material obtained from the cage mills (100, 200) is sent to a separate particle classifier to sort the particles by size (weight) to obtain the final product, reclaimed sand.

3. Classification Process

On the other hand, the pulverized material obtained through the discharge port 114 of the casing 110 includes large sand having a particle diameter of 10 mm or less and small sand having a particle diameter of 0.075 to 0.15 mm, which satisfies the particle distribution condition of the reclaimed sand for concrete. A considerable amount of the fine powder of 0.075 mm or less is collected by the dust collecting device 370 through the dust outlet 117 during the pulverization process and a small amount of the fine powder is discharged through the outlet 114. The pulverized product obtained from the cage mill 100 is supplied to the particle classifier 300 to classify particles by weight (size).

8 and 9 illustrate the structure of a particle classifying apparatus 300 according to an embodiment of the present invention. The particle classifying apparatus 300 shown in the figure is configured to classify the pulverized material into two grades using wind power to classify the powder into fine particles (fine powder), small particles (light particles), and large particles (heavy particles) Respectively. In other words, the particle classifier 300 includes a first classifier 310 for classifying the first stage to filter only dust that is lighter than the first classifying point in the classifying pulverized product, and a second classifier And a second classifier 330 for classifying the second stage classifying the particles that are lighter than the point and the heavy particles.

The first classifier 310 is provided with a classifying pulverized material inlet 302 on one side of a box structure upper part 312a that provides a space to the outside and an outlet of the first classifier 310 is provided on the opposite side thereof. (Also referred to as an inlet of the second classifier 330), and a dust outlet 319 through which dust can escape is provided on the upper side. The pulverized water inlet 302 is connected to the pulverized water supply means 280 and the dust outlet 319 is connected to the dust recovery apparatus 370 through the reverse flow recovery pipe 320, And becomes the inlet of the 2-minute supply unit 330. The box structure upper part 312a and the box structure lower part 312b support the upper part 312a of the box structure and the lower part of the box structure 312b, Is divided into two wind power classifying plates (350). The wind power classifying plate 350 extends from the pulverized water inlet 302 to the outlet 318 and has a plurality of openings 352 formed therein. The openings 352 are preferably formed in a rectangular shape or a slit shape having a length and a width of about 20 x 0.2 mm to about 100 x 0.7 mm, for example. Further, the longitudinal direction of the openings 352 is orthogonal to the conveying direction of the pulverized product, and the entire openings 352 are also arranged in a plurality of rows in a direction orthogonal to the conveying direction of the pulverized product, It is preferable to form an array. At one side of the box structure lower part 312b is provided an intake port 314a through which an airflow is introduced and which is connected to an external blower (not shown) for supplying pressurized air through a blowing pipe (not shown).

The vibration generator 325-1 generates vibrations at one side of the box structure lower part 312b to cause the pulverized classified material on the wind power classifying plate 350 to be transported from the pulverized material inlet 302 to the outlet 318. [ Respectively. The lower part of the box structure 312b is supported by the elastic member 329 so that the lower part of the box structure 312b is oscillatable. It is preferable that the vibration generator 325-1 is installed on two sides parallel to the conveying direction of the middle point between the inlet 302 and the outlet 318 (the direction from the inlet 302 to the outlet 318). The vibration generator 325-1 can be implemented as a vibration motor that vibrates by using centrifugal force generated due to the imbalance of the weight, for example, by attaching different weights to both ends of the motor rotation shaft. The vibration generator 325-1 generates the vibration force of the vibration generator 325-1 so that the vibration force generated by the vibration generator 325-1 oscillates in the direction of approximately 30 to 60 占 with respect to the direction from the entrance 302 to the exit 318, 1 is preferably provided. The vibration force generated by the vibration generator 325-1 includes a component directed upward and a component directed toward the outlet 318. [ As the wind power classifying plate 350 vibrates at this angle, the pulverized water particles loaded on the wind power classifying plate 350 gradually flow toward the outlet 318 side.

Further, it is preferable that scattering plates 340 disposed above the wind power classifying plate 350 are arranged so that the flying particles collide with the air flowing out through the openings 352. The dispersing plate 340 is an inverted-V-shaped or inverted-U-shaped plate, and is disposed in the form of covering the openings 352 just above the openings 352. It is preferable that the dispersing plate 340 is disposed in a direction orthogonal to the conveying direction of the pulverized product and is disposed in such a manner that one dispersing plate 340 covers each row of the holes 352. Of course, the plurality of rows of apertures 352 may be covered with one dispersion plate 340. In order to allow most of the pulverized particles (non-dust particles) impinging on the dispersing plate 340 to advance and fall toward the conveying direction when the dispersing plate 340 is disposed, 352) and the outlet (318). By disposing the dispersion plate 340 in this manner, the transportation speed of the pulverized particles is further increased, and efficient classification is possible.

This dispersing plate 340 allows the particles to be separated and removed to fly out of the dispersing plate 340 while being loaded on the high-speed air stream, while the particles larger than dust can not escape upward, And let it fall onto the classifying plate 350. In particular, since the diffuser plate 340 is tilted toward the outlet 318, most of the particles will be closer to the outlet 318 than before. It is possible to quickly separate the dust from the pulverized material at a low height, so that it is not necessary to increase the height of the inner space of the upper part of the box structure 312a. Without this dispersing plate 340, dust and particles of various sizes scatter in the air in the upper space of the wind force classifying plate 350, making it difficult to finely separate the dust and the remaining particles while colliding with each other in a dizzy manner, It is very difficult to control the advance (return). Further, the dispersing plate 340 separates the dust attached to the surface of the pulverized particles through collision and improves the granulation of the pulverized particles.

The second classifier 330 has a structure similar to that of the first classifier 310. The wind power classifying plate 350 having the openings 352 formed between the box structure upper part 338a and the box structure lower part 338b is disposed and the dispersing plate 340 is disposed thereon. The elastic member 329 and the suction port 314b are provided on one side of the first classifier 310 and the first classifier 310, respectively. The inlet of the second classifier (330) communicates with the outlet (318) of the first classifier (310). The outlet of the second classifier (330) is provided in two places. One is provided with a small particle ejection port 333 at the upper part 338b of the box structure and the other is provided with a heavy particle ejection port 332 at the end of the wind force classifying plate 350. The respective outlets 332 and 333 are provided with conveyors 360a and 360b for conveying the final product.

The second classifier (330) differs from the first classifier (310) in the strength of the airflow used to classify the pulverized material to be classified. Firstly, the pulverized pulverized material (particles having a diameter of 10 mm or less) loaded on the pulverized material conveying means 270 is passed through the pulverized material inlet 302 of the first classifier 310, . The vibration is transmitted to the wind power classifying plate 350 while the vibration generator 325-1 is operating. By the vibration of the wind power classifying plate 350 and the flowability of the pulverized powder particles to be classified, the pulverized pulverized material particles are transported toward the outlet 318. At this time, the particles to be grinded collide with each other due to the vibration, and the fine powder adhering to the grinded particles to be classified is also peeled off by the static electricity caused thereby.

On the other hand, the air flow provided by the external air blowing means flows downward through the air intake port 314a to the wind power classifying plate 350, and then passes through the openings 352 of the wind power classifying plate 350 at a high speed. At this time, the powdered powder particles advancing toward the outlet 318 by the vibration on the wind power classifying plate 350 pass through the openings 352 and blow up at a high speed through the openings 352, And it collides with the dispersing plate 340 on the upper side. Most of the particles colliding with the dispersion plate 340 fall down onto the surface of the lower wind power classifying plate 350. Only dust that is lighter (smaller) than the dust classification point is lifted up from the dispersion plate 340, 319 to the dust collecting device 370 along the reverse flow collecting pipe 320 to be recovered. Such an operation is continuously repeated so that particles having a size exceeding the dust classification point are discharged to the outlet 318. An air fan (not shown) may be provided to form an air flow that flows backward from the first classifier 310 to the dust collector 370 for efficient dust collection.

The dust recovery apparatus 370 may include a centrifugal dust collector (cyclone) 372 that directly removes dust using, for example, centrifugal force, and a dust hopper 375 in which the dust is filtered. A back filter 374 may be included to replace the centrifugal force collector 372, or in conjunction with it, to collect dust with high efficiency up to finer dust to improve the cleanliness of the exhaust air. The dust collecting device 370 collects the dust from the dust-containing air stream and discharges the purified air stream to the outside.

Since the dust classification point is determined by the force for blowing up the pulverized water particles through the openings 352 and the intake force of the intake means which may be provided on the dust collecting apparatus 370, the external blowing means is connected to the intake port 314a per unit time (The intake air amount per unit time and the intake air pressure of the intake means when the intake means is employed in the dust recovery device 370) and the flow rate of the pulverized material particles on the wind power classifying plate 350 To adjust the cut point and the flow rate to a desired level freely. With this classification mechanism, fine dusts of 0.074 mm or less can be finely separated.

Fig. 10 schematically shows the structure of a particle classifying apparatus 400 according to another embodiment of the present invention. The particle classifying apparatus (400) also classifies the pulverized powder into three types of dusts, large particles and small particles. The particle classifying apparatus 400 includes a blower 410, a box structure 420, and conveying means 430 such as a conveyor belt. The box structure 420 is provided at the top with a dust outlet 426 connected to the dust collector 370 by a duct 320. A pulverized material inlet 422 connected to the end of the pulverized material conveyance means 270 is provided at one side of the box structure 420 and an inlet port 422 through which the pressurized air supplied from the blower 410 flows, (427). Below the intake port 427, there is provided a first outlet 428 through which large particles falling are taken out, and a first collection container 450 for collecting large particles is disposed below the first outlet 428. On the opposite side of the pulverized water inlet 422 is provided a second outlet 424 through which small particles of the pulverized material are taken out. In the section extending from the point adjacent to the first outlet 428 to the second outlet 424, the conveying means 430 for conveying the small particles of the pulverized material flying by the pressurized air of the blower 410 is disposed do. A second collection container 460 for collecting small particles is disposed under the end of the conveying means 430. It is needless to say that it is also possible to provide an air fan (not shown) which forms an air flow backward to the dust recovery device 370.

Further, it is preferable to further provide a dispersing plate 440 above the conveying means 430 to allow the particles to fall down while being crushed by the pressurized air, Do. The diffuser plate 440 may have the same structure as that of the diffuser plate 340 described above, and its role is also very small. It is preferable that the dispersing plate 440 is disposed long in a direction substantially perpendicular to the traveling direction of the pressurized airflow.

In the particle classifying apparatus 400 having such a configuration, the particles are classified into three types of particles (fine powder), small particles, and large particles by weight using wind. Specifically, the pulverized classified material put on the pulverized material conveying means 270 falls down through the pulverized material inlet 422. At this time, the blower 410 continuously blows air through the air inlet 426 at a predetermined air flow rate and a wind speed. The crushed material particles fall down into three groups according to their weight. The largest particle is limited to the first predetermined distance by the blower 410 due to its own weight and falls to the first collection container 450 located below the pulverized material inlet port 422. Small particles of medium size are blown away by the wind of the blower farther than the first predetermined distance, but they also fall on the conveying means 430 due to their own weight and then are transported and fall into the second collection container 460. The lightest powder, on the other hand, is blown up by the blower fan and is blown up above the box structure 420 and sent to the dust collector 370 through the dust outlet 426. The particle classifying apparatus 400 also appropriately adjusts the amount of air supplied to the box structure 420 by the blower 410 per unit time and the air pressure (the intake amount per unit time and the intake pressure per unit time when the intake means is adopted) You can freely change the classifying point and the amount of water to the desired level.

Although the particle classifying devices 300 and 400 configured to perform the two-stage classification have been described above, the description thereof is merely illustrative. If necessary, it may be necessary to carry out only a one-step classification in which only dust is removed from the pulverized material. In such a case, a person skilled in the art will be able to devise a modification to the particle classifying apparatus which separates only dust particles of a predetermined size or less from the crushed material based on the above description. For example, in the case of the particle classifier 300, only the first classifier 310 may be used. In the case of the particle classifier 400, both large particles and small particles fall on the transport means 430, As shown in Fig.

The present invention relates to a process for the production of industrial waste, recycled plant, (v) incinerator, reprocessing plant, recycling plant, and the like, for example (i) gravel, crushing plant, (ii) mining product, coal arm, coal plant, (iii) fertilizer, feed plant, (vi) foundry production, classification plant, (vii) concrete, asphalt reclamation plant, (viii) grinding classifying plant of other industries. The sand obtained through the practice of the present invention can be used as concrete for sand or asphalt sand, and the powder can be used, for example, as a raw material (extender) for cement, asphalt or ceramics.

50: waste concrete recycling system 52: raw material hopper
60: continuous heating furnace 62: heating furnace
67: Conveyor belt 72: Magnetic roller
80: a pulverizer input part 100, 200: a crusher (cage mill for crushing)
110: casing 114: outlet
117: dust outlet 120, 220: large diameter cage member
130, 230: small-diameter cage members 126a, 126b, 136a, 136b:
138: Small cage rotation shaft 140a, 140b, 140c, 140d: Bearing member
150: air injection member 152:
154: injection nozzle 156: compressed air supply pipe
158: Air compressor 180: Crushing chamber
270: Classified pulverized water conveying means 300, 400: Particle classifier
310: first-class supply unit 312a: upper part of the box structure,
312b: box structure lower part 314a, 314b:
319, 426: dust outlet 320: reverse flow recovery pipe
325-1, 325-2: vibration generator 330: second classifier
332, 333: particle outlet port 338a: box structure upper part
338b: box structure lower part 340:
350: Wind power classification plate 352: Open
370: dust collecting device 372: centrifugal force dust collector
410: blower 420: box structure
422: Grinding water inlet port 426: Intake port
430: conveying means

Claims (21)

The waste concrete pulverized material is injected into a cage-type crushing chamber enclosed by two or more annular striking rods while jetting the pressurized air from the center of the crushing chamber toward the side walls of the crushing chamber at a high speed, And rotating the odd-numbered rows and the even-numbered rows of the rods in opposite directions so that the waste concrete crushed into the crushing chamber is pushed by the pressurized air to collide with the striking rods in the outer row sequentially in a strong collision, A crushing device for dropping the crushed material to the lower portion of the casing surrounding the crushing chamber and discharging the dust to the upper portion of the casing while being loaded on the airflow; And
And a wind type particle classifier for applying a pressurized air flow to the pulverized material to classify the pulverized material into at least two groups or groups based on the particle weight. The apparatus according to claim 1,
A plurality of first striking rods are coupled to and supported by the first support member in an annular arrangement of at least one row so as to provide a grinding chamber on the inner side thereof and the first rotary shaft is fixed to a small diameter A cage member;
A plurality of second striking rods are coupled to and supported by the second support member in an annular arrangement of at least one row but arranged alternately with the rows of the first striking rods in a radial direction, A large-diameter cage member having a second rotation axis extending to the second support member;
A crushing material input portion for supporting the first and second rotary shafts while containing the large-diameter cage member and the small-diameter cage member and for allowing the pulverized waste concrete for crushing to be poured into the crushing chamber is provided on one side, A casing provided with a pulverized water discharge port to be discharged;
And air impinging on the first and second striking rods is injected into the crushing chamber to increase the collision energy with respect to the first and second striking rods, Injection member; And
And a first drive motor and a second drive motor for transmitting rotation force through the first rotation axis and the second rotation axis to drive the large diameter cage member and the small diameter cage member to rotate in opposite directions,
And the pulverized concrete pulverized in the flow of the centrifugal force and the pressurized air is crushed so that the pulverized concrete in the odd-numbered row and the pulverized concrete rod in the even- Recycling system. 3. The waste concrete recycling system according to claim 2, wherein the pulverized material input portion is divided into two parts and the waste concrete fragments are divided into right and left portions of the first rotating shaft to be introduced into the pulverizing chamber. Recycling system. 3. The air conditioner according to claim 2, wherein the air injection member comprises: a body portion provided to surround the first rotation shaft; an intake port provided at one side of the body portion to receive air inflated from the outside; And a plurality of spray nozzles provided in the body portion to be sprayed toward the striking rods constituting the side walls of the seal. The apparatus according to claim 4, wherein the plurality of injection nozzles are arranged such that the direction of flow of the pressurized air injected from the plurality of injection nozzles is perpendicular to the rotational direction of the first thermal blow bars disposed in the innermost row of the crush chamber The recycled waste concrete recycling system recycles sand from waste concrete. [3] The apparatus according to claim 2, wherein the casing comprises: a dust discharge port for discharging dust generated in the pulverizing process of the waste concrete pulp on the air stream; A filter disposed in the casing between the large-diameter cage member and the dust outlet so as to allow dust to pass therethrough but not to allow particles of a predetermined size or more to escape; And
Further comprising a dust collecting device for collecting the dust from the dust-containing air stream flowing through the duct connected to the dust outlet and discharging the purified air stream. The apparatus according to claim 2, wherein the crushing device further includes a bearing member for rotatably and stably supporting the small-diameter cage member and the large-diameter cage member so as not to be tilted in a direction orthogonal to the first rotation axis and the second rotation axis Wherein the waste concrete recycling system recycles sand from waste concrete. The wind turbine type classifier according to claim 1,
A box structure having an inlet for the pulverized material and an outlet for the pulverized material on both sides thereof, a dust outlet on the upper side, and an inlet port lower than the pulverized material inlet;
A plurality of openings extending from an inlet of the pulverized product to an outlet of the pulverized product, and a plurality of openings arranged in a plurality of rows, plate;
The grinding water particles are arranged so as to cover the respective rows above the respective rows of the plurality of openings so as to rise above the openings by the pressurized airflow so that the grinding particles colliding with the grinding water particles drop quickly. ;
A vibration generator installed at one side of the box structure to generate a vibrating force to vibrate the wind power classifying plate to cause the pulverized material to be fed onto the wind power classifier through the pulverized material inlet to be conveyed toward the pulverized material outlet; And
And a first classifier including a blower for supplying pressurized air to the inlet,
While the pulverized material on the wind power classifier plate is being conveyed toward the outlet by the vibration, the pressurized air supplied by the blower is blown upward through the plurality of openings to push up the pulverized material upward, So that the dust is scattered on the ascending air flow and escapes through the dust outlet, and the pulverized water particles are repeatedly dropped on the wind power classifying plate, so that the pulverized material from which dust has been removed is taken out to the pulverized water outlet Waste concrete recycling system recycling sand from waste concrete. The classifier according to claim 8, wherein the wind turbine particle classifier further comprises a second classifier having the same structure as the first classifier, wherein the second classifier is configured to classify the pulverized material discharged from the outlet of the first classifier into a predetermined class Wherein the particles are classified into heavier grains and lighter grains than the points of the reclaimed concrete recycling system. 20. The method according to claim 8 or 19, wherein the dispersing plate is an inverted-V or inverted-U-shaped long plate, and the pulverized material particles impinging on the dispersing plate are forwardly moved in the carrying direction, Is disposed obliquely so as to face between the openings covering the openings and the outlet. The waste concrete recycling system recycles the sand from the waste concrete. 10. The apparatus according to claim 8 or 9, wherein the openings are rectangular or slit-shaped openings having a narrow width and a long length, and each of the openings is provided so that its longitudinal direction is orthogonal to the transport direction, Wherein the heat is also perpendicular to the conveying direction, and the adjacent two rows of openings are disposed in a staggered configuration. The wind turbine type classifier according to claim 1,
A first outlet which is located below the inlet of the pulverized product and is located below the inlet port and in which large particles of the powder to be classified fall down and is taken out; A box structure having a second outlet for taking out small particles of the powder to be classified and a dust outlet for dust extraction of the powder to be classified;
A blower blowing the air pressurized through the inlet port toward the second outlet; And
And conveying means disposed at the bottom of the box structure for conveying small particles of the pulverized material flying by the pressurized air falling to the outlet,
The pressurized air is blown into the second classifying pulverized product falling freely at the pulverized water inlet port so that particles heavier than the first classifying point drop to the first outlet port depending on the weight of the pulverized product, The dust having a weight smaller than the classifying point is carried by the pressurized air to the dust outlet so that the particles having a middle weight between the first classifying point and the second classifying point drop onto the conveying means and are discharged to the second outlet Wherein the waste concrete recycling system recycles sand from waste concrete. 13. The wind turbine type particle sorting apparatus according to claim 12, wherein the wind type particle sorting apparatus is disposed above the conveying means, and collides with the powdered classified material lifted by the pressurized air to cause the particles of the middle weight to fall on the conveying means And a dispersing plate for allowing the dust to fly upward. The waste concrete recycling system recycles the sand from the waste concrete. The waste concrete pulverized material is injected into a cage-type crushing chamber enclosed by two or more annular striking rods while jetting the pressurized air from the center of the crushing chamber toward the side walls of the crushing chamber at a high speed, And rotating the odd-numbered rows and the even-numbered rows of the rods in opposite directions so that the wasted concrete rupture is pushed by the pressurized air to be crushed while striking the striking rods of the outer row in the inner row in succession, A pulverizing step of dropping to a lower part of a casing surrounding the cage-type pulverizing chamber and discharging the dust to the dust collecting device on an air stream; And
And a wind type particle sorting step of applying a pressurized air flow to the pulverized material and classifying the pulverized material into at least two groups or groups based on the particle weight. The method of recycling waste concrete from recycled waste concrete as recited in claim 1, 15. The method of recycling waste concrete according to claim 14, wherein when the waste concrete is crushed into the crushing chamber, the waste concrete is divided into left and right portions based on a rotation axis at the center of the crushing chamber. . 15. The apparatus according to claim 14, wherein the air injection from the center to the side wall of the crushing chamber is made through a plurality of injection nozzles provided in an air injection member disposed in the center of the crushing chamber, Wherein the direction of spraying air is a direction orthogonal to or reversing the direction of rotation of the first thermal striking bars disposed in the innermost row of the crushing chamber. 15. The method of claim 14, wherein the crushing step further comprises the step of providing a dust outlet at the top of the casing to discharge dust generated in the crushing process through the dust outlet and to be collected by the dust recovery device A method of recycling waste concrete recycling sand from waste concrete. 15. The method of claim 14, wherein the wind-powered particle classifying step comprises: a wind-power classifying plate provided with a plurality of openings; and a dispersing plate disposed on the openings so that the crushed particles colliding with the crushed- The box structure is vibrated by a vibration generator installed on the box structure so that the pulverized material supplied on the wind power classifier is transported from the pulverized material inlet to the pulverized material outlet and blowing air under the wind material classifier, The dust is pushed upward by pushing up the pulverized material passing through each of the openings through the plurality of openings and striking the dispersing plate so that the dust is carried by the upward flow through the dust outlet provided above the box structure, The water particles are repeatedly caused to fall on the wind power classifying plate so that the dust- And a first sorting step of extracting sand from the waste concrete outlet to the outlet of the pulverized product. The method of claim 18, wherein in the wind turbine classification step, the pulverized material taken out to the pulverized material outlet in the first classifying step is subjected to a classifying process in the same manner as the first classifying step, Further comprising a second sorting step of sorting the particles into heavier crushed water particles and lighter crushed water particles. ≪ Desc / Clms Page number 19 > The method as claimed in claim 18 or 19, wherein the openings are rectangular or slit-shaped openings having a narrow width and a long length, the openings being provided so that the longitudinal direction thereof is perpendicular to the conveying direction of the pulverized material, Are arranged in a zigzag manner, and the two rows of adjacent rows are arranged in a zigzag form,
The dispersing plate is an inverted-V-shaped or inverted-U-shaped long plate, and the direction of the mouth is such that the pulverized material particles colliding with the pulverized material particles move forward in the carrying direction, Wherein the sand is recycled from the waste concrete to be recycled. 15. The method of claim 14, wherein the wind-powered particle classification step blows the air pressurized through the inlet port provided below the pulverized material inlet port to the second outlet port into the classified pulverized material falling free from the pulverized material inlet of the box structure, Particles that are heavier than the first classification point are discharged to the first outlet disposed below the inlet port and dusts that are lighter than the second classification point are discharged through the dust outlet port provided in the upper portion of the box structure according to the weight of the pulverized product, The particles having an intermediate weight between the first classifying point and the second classifying point are dropped onto the conveying means provided below the box structure and discharged to the second outlet. Recycled waste concrete recycling method.

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