KR20150069807A

KR20150069807A - Crushing apparatus and method for recycling sands from concrete wastes

Info

Publication number: KR20150069807A
Application number: KR1020130156382A
Authority: KR
Inventors: 박대훈; 이재송
Original assignee: (주) 티피티; 이재송
Priority date: 2013-12-16
Filing date: 2013-12-16
Publication date: 2015-06-24

Abstract

Disclosed are a crushing apparatus and a crushing method for recycling sands from waste concrete. The method comprises: inserting a crushed waste concrete material in a cage-type crushing room surround by a hitting bar arranged in at least two rows in a loop; spraying pressured air at a high speed toward hitting bars on the side wall in the center of the crushing room, and rotating hitting bars in an odd row and in an even row in a reverse direction each other at the same time; hitting the crushed waste concrete material drifted by the pressured air with hitting bars from an inside row to an outside row in order to be crushed; and discharging a crushed material to the lower part of a casing surrounding the cage-type crushing room, and discharging dust loaded on air through a dust discharge hole to the outside of the casing. The crushed waste concrete material is poured to the left and right of the axis of rotation when being poured in the crushing room.

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a crushing apparatus and a crushing method,

The present invention relates to a pulverizing apparatus for pulverizing waste concrete generated when a concrete structure is dismantled, and more particularly, to a method of efficiently pulverizing waste concrete pulverized into small-sized pulverized material, The present invention relates to a waste concrete crushing apparatus and a crushing method using the same.

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 stacking phenomenon of the charged particles to cause a 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 put into the pulverizing chamber has a weak kinetic energy of itself and is concentrated only into one place, and a sufficient centrifugal force is not applied to the pulverized material rapidly, so that pulverization of the raw material is not effectively performed, Problems arise. In addition, since the pulverized material that 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 malfunction.

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 state in which the spacing between the striking rods 14 and 24 is aligned with the design may deteriorate the productivity and the quality of the product (pulverized product).

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, &Lt; / 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.

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, The present invention provides a waste concrete crushing apparatus capable of effectively recovering sand from waste concrete which can improve the quality of waste concrete, and a method for crushing waste concrete using the same. 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 an improved grinding apparatus and grinding method of a cage-type mill capable of reducing the operation / maintenance cost.

According to an aspect of the present invention, there is provided a method of disposing a waste concrete crusher 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 directions opposite to each other so that the pulverized concrete pulverized in the pulverizing chamber is pushed by the pressurized air, And the pulverized material is dropped to the lower portion of the casing surrounding the pulverizing chamber and discharged, and the dust is discharged onto the upper portion of the casing in an air stream. A waste concrete pulverizer grinding apparatus for recovering sand from concrete is provided.

According to another aspect of the present invention, 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, and a grinding chamber is provided on the inner side. A small-diameter cage member coupled to the center in the normal direction; 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, And pulverizing the pulverized concrete pulverized by the centrifugal force and the flow of pressurized air while rotating the pulverizing rods and the striking rods of the even-numbered rows counterclockwise to each other to pulverize the pulverized pulverized concrete Device is provided.

According to an embodiment of this grinding apparatus, the first support member of the small-diameter cage member includes a small-diameter circular plate, an annular first band member concentric with the small-diameter circular plate and surrounding the small-diameter circular plate, And an annular second band member disposed on the opposite side of the first band member to overlap the edge portion of the small diameter disc and the first band member, And a second row of striking bars disposed annularly between the first band member and the second band member and sandwiched between the first band member and the second band member, And the first rotation axis is disposed at the center of the crushing chamber surrounded by the first thermal striking bars, which is connected to the center of the small diameter disk and extends in the normal direction. In this case, the second support member of the large-diameter cage member includes a large-diameter circular plate disposed in parallel to the small-diameter circular plate and arranged larger than the small-diameter circular plate and concentric with the large-diameter circular plate, And a fourth band member surrounding the third band member, wherein the second striking bars are disposed between the edge portions of two rows of the large-diameter disk and the third and fourth band members Each of the first and second thermal striking rods being arranged in an annular arrangement and including a second thermal striking rod and a fourth thermal striking rod which are respectively annularly arranged and sandwiched between the first thermal striking rods and the third thermal striking rods, And the fourth rotary striking rods are located outside the third rotary striking rod and the second rotary shaft is coupled to the center of the large rotary disc in the normal direction.

According to another configuration example of the grinding apparatus, the first support member of the small-diameter cage member includes a small-diameter disk and an annular plate member concentrically and spaced away from the small-diameter disk, The rods are fixedly coupled at one end to the periphery of the outer periphery of the annular plate member, first heat striking rods sandwiched and annularly arranged between the edge portion of the small diameter disc and the inner periphery portion of the annular plate member Wherein the second support member of the large-diameter cage member is concentric with the small-diameter disk, and the second support member of the large-diameter cage member is concentric with the small diameter disk, And a diameter of the large-diameter disk being smaller than that of the annular plate member, the second striking rods being arranged in the vicinity of the large diameter And second heat striking rods arranged in an annular shape along the periphery of two rows of the plate and fixed to the large diameter disk at one end thereof and fourth heat striking rods respectively fixed to the large diameter disk, And the fourth row of striking rods disposed in the outer annular row are located outside the third row of striking bars. The first row of striking bars may be located between the first row of striking bars and the third row of striking bars.

In such grinding apparatuses, it is preferable that the pulverizer input unit is divided into two parts and the waste concrete fragments are divided into left and right portions of the first rotating shaft to be introduced into the pulverizing chamber.

In addition, the air injection member may include a body portion that surrounds the first rotation shaft, an intake port provided at one side of the body portion to receive air that is pressurized from the outside, and a pressurized air introduced through the intake port, And a plurality of spray nozzles provided in the body portion to spray the droplets toward the striking 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 .

It is preferable that the casing of the crushing apparatus further comprises a dust discharge port for discharging the dust generated in the pulverizing process of the waste concrete pulp to the outside through the air stream. It is also preferable that a filter screen is disposed between the large-diameter cage member and the dust outlet in the casing so as to allow dust to pass therethrough but to prevent the particles larger than a predetermined size from being escaped.

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 such that the small-diameter cage member and the large-diameter cage member are not tilted in a direction orthogonal to the first rotation axis and the second rotation axis.

In accordance with another aspect of the present invention, there is provided a method of manufacturing a crushing machine, comprising the steps of: introducing a crushed waste concrete into a cage-type crushing chamber surrounded by two or more annular striking rods, 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 and the outer rows of the outer rows in the inner row are pushed by the pressurized air, And the pulverized material is dropped to the lower portion of the casing surrounding the cage-type grinding chamber and discharged, and the dust is discharged to the outside of the casing through the dust outlet through the air stream Of waste concrete pulverization for regenerating sand from waste concrete It is.

In such a pulverizing method, when the pulverized waste concrete is introduced into the pulverizing chamber, the pulverizing chamber is preferably divided into left and right portions based on the rotation axis at the center of the pulverizing 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.

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.

FIG. 1 shows a structure of a cage-type mill-type crushing apparatus for crushing a waste concrete crushing material according to the prior art to a size of 10 mm or less.
FIG. 2 illustrates an exemplary structure of a cage-type mill-type crushing apparatus for crushing waste concrete according to a first embodiment of the present invention.
3 is a cross-sectional view taken along line C-C 'in Fig.
Fig. 4 exemplarily illustrates a preferable structure of a cage-type mill (crushing apparatus) for crushing waste concrete in accordance with a second embodiment of 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 the raw material of the waste concrete crushing apparatus according to the present invention, that is, the cage mill 100 for crushing. The term " waste concrete pulverized product " is a result obtained by a pulverizing process of pulverized waste concrete using the cage-type mill 100 for pulverization, and has a maximum diameter of about 10 mm or less, more preferably about 5 mm or less, Concrete particles (debris) refers to. The pulverized material is sorted by size through a post-treatment classification process and recovered as recycled sand.

Prior to crushing the waste concrete crushed material, it is preferable to perform a pretreatment for drying them and removing the magnetic iron pieces mixed with them. 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. Moisture causes the pulverized material of the pulverized material to become entangled in the bar or the pulverizing device, which lowers the pulverizing efficiency, hinders efficient removal of dust, and interferes with the wind classification of the pulverized pulverized material to be pulverized. For this reason, it is preferable that the pulverized material is sufficiently dried.

Fig. 2 shows a cage mill 100 which is a grinding apparatus according to the first embodiment. 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.

According to this configuration, as shown in FIG. 3, while moving in the radial direction around 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 and third rows of hot stabbing rods 136a and 136b and the second row and fourth row hot rod rods 126a and 126b of the large diameter cage member 120 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, the pressurized air injection through the air injection member 150 can be injected from both sides to form a strong rotating air stream against the rotation of the first thermal striking rod 136a, so that the collision energy can be increased. 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. 4 shows the structure of a cage mill 200, which is a milling apparatus according to a second embodiment of the present invention. In Fig. 4, the same numerals as those of the cage mill 200 of the first embodiment are given the same reference numerals. The cage-type mill 200 of the second embodiment is different from the first embodiment in that the configuration of the large-diameter cage member 220 and the small-diameter cage member 230 is further 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.

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.

80: crushing-in portion 100, 200: cage mill for grinding
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
214: small diameter disc 216: annular plate member
224: Large diameter disc

Claims

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, Wherein the pulverized material is dropped to the lower portion of the casing surrounding the pulverizing chamber and discharged, and the dust is discharged to the upper portion of the casing by being loaded on the air stream.

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;
The air is injected toward the first and second striking rods in the vicinity of the first rotation axis to reinforce the collision energy of the waste concrete crushed into the crushing chamber with respect to the first and second striking rods An air 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 pulverized while the pulverizing rods of the odd-numbered rows and the pulverizing rods of the even- Concrete crushing equipment.

The optical recording and reproducing apparatus according to claim 2, wherein the first support member of the small-diameter cage member comprises: a small-diameter disk; an annular first band member concentric with the small-diameter disk and surrounding the small- And an annular second band member disposed so as to overlap the edge portion of the small diameter disc and the first band member,
Wherein the first striking bars comprise first heat striking rods annularly disposed and sandwiched between an edge portion of the small diameter disk and the second band member and a second heat striking rod disposed annularly between the first band member and the second band member A third row of striking bars sandwiched between the first row and the second row,
Wherein the first rotating shaft is disposed at the center of the crushing chamber surrounded by the first thermal striking rods and extending in the normal direction by being connected to the center of the small diameter circular plate. Crushing device.

The large-diameter cage member according to claim 3, wherein the second support member of the large-diameter cage member includes a large-diameter circular plate disposed in parallel with the small-diameter circular plate and larger than the small-diameter circular plate and concentric with the large- And a fourth band member surrounding the third band member,
The second striking rods are arranged in a two-row annular shape including second heat striking rods and fourth heat striking rods annularly arranged between two edge portions of the large-diameter disk and the third and fourth band members, The second row of striking rods being located between the first row of striking rods and the third row of striking rods and the fourth row of striking rods being located outside of the third row of striking rods,
Wherein the second rotating shaft is coupled to the center of the large diameter disk in a normal direction.

3. The apparatus according to claim 2, wherein the first support member of the small-diameter cage member includes a small-diameter circular plate and an annular plate member concentrically and spaced apart from the small-
Wherein the first striking rods are provided with first heat striking rods sandwiched and annularly disposed between an edge portion of the small diameter disk and an inner edge portion of the annular plate member and a second heat striking rod provided at one side end portion of the annular plate member, And an annularly arranged second row of striking bars surrounding the first row of striking bars,
The second support member of the large-diameter cage member includes a large-diameter circular plate concentric with the small-diameter circular plate, the large-diameter circular plate being disposed in parallel to the rear face of the small-diameter circular plate and smaller than the diameter of the annular plate member,
The second striking rods include second row striking rods and fourth row striking rods which are annularly arranged along two circumferential edges of the large-diameter disk, one end of which is fixedly coupled to the large-diameter disk, The second row of hot striking rods disposed in the column are located between the first row of hot striking bars and the third row hot striking bars and the fourth row hot striking bars disposed in the outer annular row are located outside the third row hot striking bars Wherein the pulverizing device is a pulverizing device for pulverizing pulverized concrete waste to recover sand from waste concrete.

The waste concrete pouring apparatus according to any one of claims 2 to 5, 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. For crushing waste concrete.

The air conditioner according to any one of claims 2 to 5, 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 introduce air pressurized from the outside; And a plurality of injection nozzles provided in the body portion so that the pressurized air is ejected toward the striking rods constituting the sidewalls of the crushing chamber.

The apparatus according to claim 7, wherein the plurality of spray nozzles are arranged such that the flow direction of the pressurized air injected from the plurality of spray nozzles is perpendicular to the rotational direction of the first thermal blow bars disposed in the innermost row of the crush chamber The pulverized waste concrete pulverizer for regenerating sand from waste concrete according to claim 1,

[3] The apparatus according to claim 2, wherein the casing further comprises a dust outlet for discharging the dust generated in the pulverizing process of the waste concrete pulp to the outside through the air stream, Concrete crushing equipment.

The dust collecting apparatus according to claim 9, further comprising a filter screen for allowing dust to pass between the large-diameter cage member and the dust outlet in the casing, Waste concrete crushing device for recycling.

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 pulverizing device is used to regenerate sand from 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, Wherein the dust is dropped to the lower portion of the casing surrounding the cage-type grinding chamber and the dust is discharged to the outside of the casing through the dust outlet through the air stream.

13. The method of claim 12, wherein, when the waste concrete is crushed into the crushing chamber, the waste concrete is divided into left and right portions based on the rotation axis at the center of the crushing chamber. Milling method.

The method according to claim 12 or 13, wherein the air injection from the center to the side wall of the crushing chamber is performed through a plurality of injection nozzles provided in an air injection member disposed in the center of the crushing chamber, Wherein the spraying direction of the injected pressurized 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. .