JP3204214B2 - Aggregate recovery system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aggregate recovery system, and more particularly to an aggregate recovery system for efficiently collecting coarse aggregate and fine aggregate by scraping concrete waste.

[0002]

2. Description of the Related Art When a concrete structure is destroyed, a large amount of concrete waste discharged from the site is
They just dumped in landfills in various places. However, such mere dumping is problematic from the viewpoint of recycling of useful resources that has been proposed worldwide in recent years. Therefore, in recent years, after removing foreign matter such as reinforcing bars from the concrete waste material, an aggregate, which is a part of concrete, is separated and collected from the waste material from which the foreign matter has been removed. Conventionally, when separating and recovering aggregates, first, concrete waste is appropriately crushed and coarse aggregates are recovered.
The fine aggregate is recovered by using the fine aggregate recovery device described in Japanese Patent Application Laid-Open Publication No. H11-163,036.

[0003] Such a fine aggregate recovering apparatus is provided with a ventilation type rotary drum, into which a waste aggregate of concrete waste after separating coarse aggregate is put, and a weir is provided at an end. It is. That is, a supply port for fine aggregate, cement hydrate, and the like, and an air port for supplying air are provided at the tip of the rotary drum. In addition, a plurality of scraping plates are provided on the inner surface of the drum body so as to protrude along the circumferential direction. Further, a donut disk-shaped weir and a great are fixedly provided at the end of the rotary drum.

Accordingly, in this apparatus, fine aggregate, cement hydrate, and the like are supplied to a rotating drum, and air is sent into the drum. Fine aggregate, cement hydrate, and the like are scraped up by the scraper in the drum and fall. As a result of the repeated scraping and falling, fine aggregate, cement hydrate, and the like are crushed. Further, the fine powder generated in the drum is sucked, and only the fine aggregate is separated and discharged.

[0005]

However, according to such prior art, the system for separating and recovering coarse aggregate and fine aggregate from waste concrete is still operated efficiently in practice. The fact is that it has not been researched and developed to the extent that it can do it. In addition, since the fine aggregate recovery device was configured to scrape the fine aggregate and the like with the scraper in the drum and drop it, the charged raw materials are crushed and may be used as fine aggregate. It was difficult. Furthermore, in this conventional technique, coarse aggregate must be separated from the concrete waste material as a raw material in advance, and as a result, a step of collecting coarse aggregate and a step of collecting fine aggregate are separately provided. However, there is a problem that the equipment cost increases and it takes time and effort to collect both aggregates.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an aggregate recovery system capable of efficiently recovering coarse aggregate and fine aggregate from waste concrete. Further, the present invention can efficiently collect coarse aggregate and fine aggregate from waste concrete, and at the same time, can make the entire system compact, thereby reducing equipment costs, and It is an object of the present invention to provide an aggregate collection system capable of reducing an installation space. Further, it is an object of the present invention to provide an aggregate recovery system capable of obtaining first and second ground milling media of an effective combination capable of shortening the milling time of coarse aggregate and fine aggregate. I have.

[0007]

According to the first aspect of the present invention, waste concrete is rubbed to remove coarse aggregate and fine aggregate.
Aggregate collection system for collecting aggregate
An outer drum whose axis is located in a substantially horizontal plane and is rotatably provided.
In the drum, its rotation axis coincides with the rotation axis of this outer drum
The inner drum is housed, and the concrete
The first ground medium for coarse grinding of waste material is stored.
In addition, this concrete is attached to the drum body of the inner drum.
Fine aggregate passing through the outer drum side to the waste drum and remains inside
Double-drum type with mesh part to screen coarse aggregate
Milling machine and the outer door of this double drum milling machine.
The fine aggregate discharged from the inside of the ram is stored in the drum.
The second ground medium with the second ground medium
This is an aggregate recovery system including a rice paddle device .

[0008] The rubbing paste here refers to a concrete waste and a rubbing medium, or concrete wastes.
Rubbing each other to make them finer. Concrete debris rubbed in the drum is not suitable as aggregate if there is any foreign matter such as reinforcing steel, so it is preferable to remove them in advance. The coarse aggregate as the concrete material has a size exceeding 5 mm, and the fine aggregate has a size of 5 mm or less. The first or second grinding medium is not limited to, for example, the rod-shaped or ball-shaped medium of claim 2 , but may be, for example, a plate-shaped medium. The rubbing medium can be appropriately selected depending on the type of waste concrete material and the like.

[0009]

[0010] The mesh size of the mesh portion is not limited. However, the size of the fine aggregate is determined by the mesh size. That is, in the case of concrete waste, by setting the mesh size to 5 mm, a fine aggregate that becomes a part of the cement raw material can be obtained below the mesh. The double-drum milling device has a coarse aggregate recovery section that discharges coarse aggregate obtained from the inside of the inner drum to the outside, and a fine aggregate collected from the inside of the outer drum to the outside. A fine aggregate recovering section may be provided. In this case, the coarse aggregate recovery section and the fine aggregate recovery section may be of a gravity-fall type, such as a chute, or may be of an automatic weight type, as long as the structure can recover the corresponding coarse and fine components, respectively. Various types of automatic conveyance systems such as a belt conveyor and a bucket conveyor for conveyance may be used. The gist of this double-drum type milling device is that the drum has a double inner and outer structure, and the waste concrete that has been put in is mixed with coarse aggregate and fine aggregate by milling with the first milling medium. It is only necessary that it can be separated and collected.

According to a second aspect of the present invention, the first ground medium is a rod having a predetermined length, and the second ground medium is a ball having a predetermined size. This is an aggregate recovery system. Examples of the first bar material for the milling media include, for example, deformed rebar, a simple columnar rebar, a bar in which nuts are connected to each other by a chain or the like, and two, three, and four rebars. And the like. Further, as the second ball for the grinding medium, a steel ball having a diameter of 8 to 20 mm or the like can be used.

[0012]

[0013] In the invention according to claim 1 ,
Concrete waste material is put into the inner drum of the double-drum type milling machine and rotated. As a result, the concrete waste is coarsely ground by the first ground medium. that time,
Fine aggregate slips through the net to the outer drum. On the other hand, coarse aggregate is recovered from the inner drum. Thereafter, the fine aggregate is put into the drum of the second milling device and milled by the second milling medium. Thereby, good quality coarse aggregate and fine aggregate can be efficiently recovered from concrete waste material, and equipment costs are reduced, and
Installation space is reduced.

Furthermore, in the invention described in claim 2, the first sliding even only medium and a predetermined length of the bar, and as a second sliding even balls of predetermined size only medium, coarse respectively sliding Since rubbing and sliming are performed, the rubbing effect of each rubbing device is improved. As a result, it is possible to reduce the time required for rough and fine grinding.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a grinding machine according to the present invention; 1 and 2
1 is for explaining an aggregate recovery system according to a first embodiment of the present invention. In FIG. 1, reference numeral 100 denotes an aggregate collection system, which collects coarse aggregate and fine aggregate by rubbing concrete waste 101. That is, the aggregate recovery system 100 includes a first ground milling device 104 that coarsely grounds the concrete waste material 101 by using the deformed reinforcing bar (first ground medium) 103 that is movably accommodated in the drum 102. This first
A coarse aggregate recovery screen 105 for sifting the concrete waste 101 coarsely ground by the ground milling device 104 to recover coarse aggregate, and a fine aggregate discharged from the coarse aggregate recovery screen 105 are supplied to a drum 106. A second milling device 108 is provided which collects high-quality fine aggregate by milling with a steel ball (second milling medium) 107 stored therein. Hereinafter, this will be described in detail.

In the first milling device 104, the drum 102 is rotatably provided on a base (or floor) (not shown) having a horizontal upper surface. An annular gear 109 is disposed on the outer peripheral surface of the drum 102 in the middle portion in the longitudinal direction. A drive gear (not shown) for rotating the drum 102 by meshing with the annular gear 109 is provided on the base. The drive gear is driven by a drive mechanism (including a motor, a speed reducer, and the like) (not shown). A pair of support rollers (annular rings having a flat surface and a predetermined width) 110 are fixed to the outer peripheral surfaces of both ends in the longitudinal direction of the drum 102. These support rollers 110 are each slidably supported by a pair of roller guides (not shown) that are concavely curved upward at a predetermined curvature provided on the base.

The plurality of deformed reinforcing bars 103 housed inside the drum 102 are bar steel having a predetermined length and a predetermined diameter (for example, a diameter of 6 mm) and having a circular cross section. FIG.
As shown in (A), (B) and (C), deformed reinforcing bar 103
Can be, for example, 80% of the drum length (A). Or 20% of the drum length
A large number of deformed reinforcing bars 103 of about the length can be stored in the drum. Further, a structure in which two deformed reinforcing bars 103 are connected by a chain can be used as a grinding medium (B). The deformed reinforcing bar 103 may be a bundle of three small-diameter bars (C). By the rubbing action using the deformed reinforcing bar 103, the concrete waste material 101 put into the first rubbing device 104 is 2
Roughing is also observed to 0 mm or less.

The coarse aggregate recovery screen 105 has a screen main body 111 having a mesh size of 5 mm stretched over a frame-shaped main body 111 which is gradually inclined downward toward the downstream side. The coarse aggregate recovery screen 105 may be a stationary screen, or may be vibrated by a vibrator to improve the classification efficiency. The second
The basic configuration of the rubbing device 108 is the same as that of the first rubbing device 104, such as the rotation mechanism of the drum 106, and a description thereof will be omitted. The ball 107 is a steel ball having a diameter of 8 to 20 mm.

The aggregate recovery system 10 according to the above configuration
A method for collecting coarse aggregate and fine aggregate according to Example No. 0 will be described. That is, the concrete waste material 101 is put into the drum 102 of the first milling device 104 in which the deformed reinforcing bar 103 is stored, and then the concrete waste material 101 is coarsely ground by the deformed reinforcing bar 103. Then, the concrete waste material 101 after the coarse grinding is classified into 5 mm by the coarse aggregate recovery screen 105 to collect coarse aggregate exceeding 5 mm from above the net, and fine aggregate (concrete waste material 101) of 5 mm or less from below the net. (Including fine powder such as mortar peeled from the mortar). Subsequently, the fine aggregate is put into the drum 106 of the second milling device 108, and the fine aggregate is ground with the ball 107. Thereby, it is possible to efficiently collect the coarse aggregate and the fine aggregate having a small percentage outside the standard from the concrete waste material 101. The fine powder such as mortar may be blown into the drum 106 of the second milling device 108 and discharged out of the drum 106 through an exhaust port. This fine powder discharging structure is provided on the drum 10 of the first milling device 104.
2 is still more effective.

As described above, the first milling medium accommodated in the drum 102 of the first milling device 104 is formed into a deformed reinforcing bar 103 having a predetermined length, and the second milling device 1 is formed.
08 of the second milling medium into a ball 107 of a predetermined size.
Since the rough grinding and the fine grinding are respectively performed, the grinding effect of the first and second grinding devices 104 and 108 can be improved. As a result, it is possible to reduce the time required for rough and fine grinding.

Next, an aggregate recovery system according to a second embodiment of the present invention will be described with reference to FIG. FIG. 3 shows a first milling device used in an aggregate recovery system according to a second embodiment of the present invention. The basic structure of the second grinding device (not shown) is the same as that of the first grinding device except that the grinding medium is changed from a deformed reinforcing bar to a ball. The other configuration is the same as that of the first embodiment, for example, a coarse aggregate recovery screen is disposed between the first and second milling devices, and the description is omitted.

In FIG. 3, reference numeral 200 denotes an aggregate recovery system. The aggregate recovery system 200 is provided with a first grinding device 201 for rough grinding of the concrete waste material 101. Hereinafter, the first milling device 201 will be described in detail. Reference numeral 1 denotes a base (or floor) having a horizontal upper surface, on which a drum 2 is rotatably provided. That is, the drum 2 is installed horizontally so that its rotation axis is included in the horizontal plane.
An annular gear 3 is provided on the outer peripheral surface of the drum 2 in the middle part in the longitudinal direction. The base 1 is provided with a driving gear 4 for meshing with the annular gear 3 and driving the drum 2 to rotate. The drive gear 4 is driven by a drive mechanism (not shown). Reference numerals 5 and 6 are support rollers.

Both ends in the longitudinal direction of the cylindrical drum 2 are open, and a predetermined ventilation (hot air at about 300 to 500 ° C.) is performed through the one end opening inside the drum 2. That is, the outlet of the blower tube 10 is provided in communication with the blower from the blower at the one end opening, and ventilation is performed at a predetermined flow rate and a predetermined flow rate through the blower tube 10. An outlet of a concrete waste material supply pipe 11 is in communication with an opening of one end of the drum 2. The outlet end of the supply pipe 11 is inclined and inserted into one end of the drum 2, and the waste concrete material 101 is supplied from the supply pipe 11 to the bottom of the drum 2. In addition, 20 is a sealing material between the rotating drum 2 and the blower tube 10.

On the other hand, the opening at the other end in the longitudinal direction of the drum 2 is closed by a wire mesh material 12, 13 in a radially outer portion in a weir shape. are doing. That is, an annular plate-shaped first wire net 12 is stretched over the opening at the other end in the longitudinal direction of the drum 2 so as to cover the radially outer portion. The first wire mesh 12 is stretched at the inner edge of the opening at the other end so as to be perpendicular to the rotation axis of the drum 2. The first wire mesh 12 has a mesh size of 5 mm, and can pass fine aggregate that is fine grains of 5 mm or less.

Further, a second wire mesh 13 is connected to the radial inner end of the first wire mesh 12. The second wire mesh 13 is cylindrical with a predetermined length, and both ends in the longitudinal direction are open. That is, one end of the cylindrical second wire mesh 13 in the longitudinal direction is connected to the radial inner end of the first wire mesh 12, and the other end projects into the discharge pipe 14 and is open.
The mesh size of the second wire mesh 13 is 20 mm. In addition,
The mesh size of these metal meshes 12 and 13 is determined by the maximum and minimum dimensions of the aggregate of the supplied concrete waste material 101. Further, a disc 15 is fixed to the other end opening of the second wire mesh 13. This disk 15
Has an opening of a predetermined diameter at the center (annular). The discharge pipe 14 is installed so as to cover the other end of the drum 2 in the longitudinal direction. A discharge port 16 is provided at a lower portion (bottom), and a communication port to a dust collector (not shown) is provided at an upper portion (top). 17 are established respectively. In addition, 21 is a sealing material between the rotating drum 2 and the blower tube 10.

In the first milling device 201 of the second embodiment having the above-described structure, while the drum 2 is rotated around its axis at a predetermined speed by a driving mechanism (not shown), the concrete waste material is supplied from the supply port. At the same time as 101, a predetermined amount of air (hot air) is blown from the air vent. As a result of operation for a predetermined time (for example, 30 minutes to 60 minutes) in this state, in the drum 2, the concrete waste material 101 heated to about 300 ° C. is coarsely ground by the deformed reinforcing bar 103, and the coarse aggregate is separated. Is done. The components (such as mortar) attached to the concrete waste material 101 become fine powder and are discharged to the dust collector through the communication port 17 together with air. Aggregates having a predetermined particle size (5 mm or less) are discharged to the outlet 16 through the first wire mesh 12. Aggregates larger than this will be discharged through the second wire mesh 13 or will be discharged after they have been worn down to fine aggregates.

In this case, the deformed reinforcing bar 103, which is a rubbing medium, moves randomly at the bottom of the drum 2, but is blocked by the first wire mesh 12, the second wire mesh 13 and the like, and moves outside the drum 2. It does not jump out. This is because the deformed reinforcing bar 103 has a bar diameter larger than 5 mm. In addition, the concrete waste material itself can be heated to, for example, about 300 to 500 ° C. and supplied to the drum 2. In this case, room temperature air can be supplied instead of hot air.

Next, an aggregate recovery system according to a third embodiment of the present invention will be described with reference to FIG. The system of the third embodiment eliminates the coarse aggregate recovery screen by employing a double drum type milling device that automatically separates coarse aggregate and fine aggregate as the first milling device. This is an example. FIG. 4 shows an entire aggregate recovery system according to a third embodiment of the present invention. In order to avoid redundant description, here, the same components as those of the first milling device of the second embodiment and the first component of the first embodiment are used.
Parts that are the same as the constituent parts of the rubbing device are given the same reference numerals, and description thereof is omitted.

In FIG. 4, reference numeral 300 denotes an aggregate recovery system. The aggregate recovery system 300 includes a double drum type milling device 301 and a second milling device used in the first embodiment. 108. The second milling device 108 is different from the second milling device of the second embodiment (approximately the same type as the first milling device of the second embodiment shown in FIG. 3). You may. Since the second milling device 108 has been described in the first embodiment, the double drum milling device 301 will be described in detail here. The double drum type milling device 301 has a double drum 2 rotatably provided on a base 1. The double drum 2 has a horizontal outer drum 302A rotatably provided with its rotation axis positioned substantially in a horizontal plane, and its rotation axis coincides with the rotation axis of the outer drum 302A. An inner drum 302B in which a plurality of wire nets 30 each having a mesh size of 5 mm are stretched over the entire drum body longer in the longitudinal direction than 302A;
It is composed of The mesh portion 30 sieves the waste concrete material 101 to be rubbed into coarse aggregate and fine aggregate.

Both ends of the cylindrical double drum 302 in the longitudinal direction are open, and the inner drum 3 is opened from one end opening.
Hot air is passed through the inside of 02B. That is, the outlet of the blower tube 10 is provided in communication with the opening at one end, and ventilation is performed at a predetermined flow rate and a predetermined flow rate through the blower tube 10. Also, this double drum 30
2 is provided at one end opening thereof with a supply pipe 1 for the concrete waste material 101.
One outlet is in open communication. The outlet end of the supply pipe 11 is inclined and inserted into one end of the inner drum 302B, and the concrete waste material 101 is supplied from the supply pipe 11 to the bottom of the inner drum 302B.

On the other hand, at the opening at the other end in the longitudinal direction of the double drum 302, a collecting part for coarse aggregate and fine aggregate is assembled. Specifically, fine aggregate of 5 mm or less that has passed through the net 33 and accumulated in the outer drum 302 </ b> A is discharged to the outlet 16.
Fine aggregate chute (fine component recovery unit) 31 discharged from A
Is attached to the lower portion of the other end of the inner drum 302B. At the other end of the outer drum 302A, a large-sized coarse aggregate chute (coarse component collecting unit) 32 for collecting coarse aggregate remaining inside the inner drum 302B is provided.
It is attached so as to enclose the other end of 2A. A suction port 33 for discharging the fine powder of the concrete waste material 101 generated inside the double drum 302 (the inner and outer drums 302A and 302B) during the rubbing is formed on the upper part of the coarse aggregate chute 32. Have been.

Downstream of the suction port 33, a dust collector for capturing and collecting fine powder is connected via a duct (not shown). A discharge pipe 16B is connected to a lower portion of the chute 32 for coarse aggregate. In FIG. 1, 3
Reference numeral 4 denotes a seal between the inner drum 302B and the chute 31 for fine aggregate, and reference numeral 35 denotes a seal between the outer drum 302A and the chute 32 for coarse aggregate. Reference numeral 36 denotes a coarse aggregate discharge port formed at the center of the other end surface of the inner drum 302B. Inside the inner drum 302B, a plurality of deformed reinforcing bars (deformed steel bars) 10 serving as milling media are provided.
3 is movably accommodated.

In the double drum type milling apparatus 301 having the above-described structure, the concrete waste material 101 is supplied from the supply port while the double drum 302 is rotated around its axis at a predetermined speed by a driving mechanism (not shown). As well as
Ventilation (hot air) with a predetermined air volume is performed from the ventilation opening. As a result of the operation for a predetermined time (for example, 30 minutes to 60 minutes) in this state, about 300 minutes are generated inside the inner drum 302B of the double drum 302.
Concrete waste material 101 heated to 0 ° C.
As a result, coarse abrasion is also observed by 03 and separated into coarse aggregate and fine aggregate containing fine powder. Further, a part of the mortar or the like adhering to the surface of the aggregate becomes a flying fine powder and is discharged to the dust collector through the suction port 33 together with the air.

Among the aggregates, those having a predetermined particle size (5 mm or less) fall through the net portion 30 to the lower portion of the outer drum 302A. This small fine aggregate is used for the outer drum 302A
Through the fine aggregate chute 31 from the other end of the
It is discharged from A. Thereafter, the discharged fine aggregate is sent to the second grinding device 108, and the fine particles are also ground by the balls 107 stored in the drum 106. On the other hand, the coarse aggregate having a particle diameter exceeding 5 mm remaining inside the inner drum 302B is dropped from the coarse aggregate discharge port 36 formed at the other end of the inner drum 302B to the coarse aggregate chute 32, and thereafter Is discharged through the discharge port 16B.

When the concrete waste material 101 is coarsely ground, the deformed reinforcing bar 103, which is a ground medium, randomly moves at the bottom of the double drum 302. Has a coarse aggregate outlet 36 formed only in the center thereof, and its outer edge is closed by an annular end plate, so that these deformed reinforcing bars 103 are blocked by this end plate. Does not jump out of the inner drum 302B. Further, since the rod diameter of the deformed reinforcing bar 103 is 6 mm with respect to the mesh of 5 mm of the net 30, the deformed reinforcing bar 103 passes through the mesh of the net 30 while the inner drum 302B rotates.
There is no jump to the side.

As described above, the concrete waste material 101 charged into the inner drum 302B is coarsely ground by the deformed reinforcing bar 103, and the fine aggregate is separated into the outer drum 302A through the mesh portion 30, and this is separated from the fine aggregate chute 31. On the other hand, since the coarse aggregate was recovered from the coarse aggregate chute 32, the double-drum type milling device 301 was used to collect the coarse aggregate.
Coarse aggregate and fine aggregate can be efficiently and simultaneously recovered from the concrete waste material 101. Moreover, as compared with the first and second embodiments, the entire system is made compact as much as the coarse aggregate recovery screen 105 can be omitted. As a result, the equipment cost can be reduced and the space can be saved.

[0037]

According to the first aspect of the present invention, the concrete waste is coarsely ground by a double-drum type milling device, and then the fine aggregate after the coarse grinding is milled by a second milling device. Since the fine aggregate is used, the coarse aggregate and the fine aggregate can be efficiently recovered from the waste concrete, and the equipment cost can be reduced and the installation space can be reduced.

Further, according to the second aspect of the present invention, a rod having a predetermined length is used as the first grinding medium, and a ball having a predetermined size is used as the second grinding medium. Therefore, it becomes an effective medium combination for obtaining coarse aggregate and fine aggregate from concrete waste material, thereby improving the grinding effect and, as a result, reducing the time required for rough grinding and fine grinding. be able to.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an aggregate recovery system according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a ground medium according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a first milling device used in an aggregate recovery system according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a double-drum type milling device used in an aggregate recovery system according to a third embodiment of the present invention.

[Explanation of symbols]

 30 mesh part, 100, 200, 300 aggregate recovery system, 101 concrete waste material, 102, 106 drum, 103 deformed reinforcing bar (first ground mill medium), 104, 201 first ground mill device, 105 coarse aggregate Recovery screen, 107 balls (second ground medium), 108 second ground apparatus, 302 double drum, 302A outer drum, 302B inner drum.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Hiroyuki Matsuda, Inventor 1-1, Donancho, Yawatanishi-ku, Kitakyushu-city, Fukuoka Prefecture Inside the Cement Development Center, Mitsubishi Materials Corporation (72) Yusuke Nishimura 1, Donanmachi, Yawatanishi-ku, Kitakyushu-shi, Fukuoka No. 1 Mitsubishi Materials Corporation Cement Development Center (56) References JP-A-8-198652 (JP, A) JP-A-62-70492 (JP, A) JP-A-48-79351 (JP, A) ( 58) Surveyed fields (Int.Cl. ⁷ , DB name) B02C 17/00-17/24 B09B 1/00-5/00 C04B 18/16

Claims (2)

(57) [Claims] (1) Rubbing concrete waste material to remove coarse bone
Aggregate collection system for collecting aggregate and fine aggregate
And its rotation axis is located in a substantially horizontal plane and is rotatably provided.
The rotation axis of the outer drum
The inner drum that matches the axis is housed, and inside this inner drum
The first ground paste for coarsely grinding the above concrete waste
The medium is stored, and the drum body of the inner drum is
Fine aggregate that passes through this concrete waste to the outer drum side
And a mesh to screen the coarse aggregate remaining inside
Double drum type grinding machine and this double drum type grinding machine
The fine aggregate discharged from the inside of the outer drum of the
Ground by the second ground medium stored in the medium
Aggregate recovery system with a second milling device
M 2. The first milling medium is a rod of a predetermined length.
And the second milling medium is a boring of a predetermined size.
The aggregate recovery system according to claim 1, wherein the aggregate is collected.