KR20060045128A - Sorting and washing apparatus of aggregate suitable to manufacturing of concrete and gathering method of aggregate thereby - Google Patents

Abstract

The present invention relates to an apparatus for sorting and washing aggregate suitable for producing concrete, and a method for collecting aggregate by the same. In preparing concrete for experimental or ready-mixed concrete, aggregates having a required particle size range through trommel screens and high-pressure spraying of rotating drums are prepared. While sorting, it continuously removes foreign substances such as fine powder attached to the surface of aggregate, and accordingly, it has the required strength in concrete mixing and manufactures high-quality concrete that meets certain criteria, It is an object of the present invention to provide a screening and washing apparatus and a method for collecting aggregate by the same.

The present invention to achieve the above object, the support frame; A first sorting means rotatably installed on the support frame and configured to selectively discharge foreign matter and aggregates having a predetermined particle size and aggregates having a predetermined particle size among aggregates introduced into the support frame; An aggregate moving member installed in the first selection means to move the aggregate inside in one direction during the rotational operation of the first selection means; An input unit provided on one side of the first sorting means to inject aggregate into the first sorting means; A second sorting means provided between the input portion and the first sorting means for pre-selecting aggregates having a required particle size range or more; Washing means for washing the aggregate installed in the first selection means moved by the aggregate moving member; A discharge part installed to face the input part to discharge the aggregate selected by the first selection means and the washing means; And it provides a device for sorting and washing the aggregate suitable for the production of concrete including a drive means for rotating the first selection means.

Aggregate, first sorting means, second sorting means, rotating drum, trommel screen, motor, blade

Description

Sorting and washing apparatus of aggregate suitable to manufacturing of concrete and gathering method of aggregate thereby

1 is a block diagram showing an apparatus for sorting and washing aggregate suitable for producing concrete according to the present invention.

FIG. 2 is a sectional view from the front of the apparatus shown in FIG. 1; FIG.

Figure 3 is a perspective view showing the sorting means and washing means that is the main part of the screening and washing apparatus for the aggregate suitable for producing concrete according to the present invention.

4 is a cross-sectional side view of the apparatus shown in FIG. 1;

* Explanation of symbols for main parts of the drawings

100: input unit 200: first selection means

210: rotating drum 230: trommel screen

240: blade 250: rotary linkage

300: washing means 310: water supply pipe

320: water spray nozzle 410: motor pump

500: drive means 510: motor

520: power transmission gear 530: control unit

600: outlet 700: differential outlet

The present invention relates to an apparatus for sorting and washing aggregate suitable for producing concrete, and a method for collecting aggregate by the same, and more particularly, in preparing concrete for experimental or ready-mixed concrete, through a trommel screen of a rotating drum and high pressure watering. While selecting the aggregates in the range, foreign substances such as fine powder adhered to the aggregate surface are continuously removed, and accordingly, the concrete is manufactured to produce high-quality concrete that meets a predetermined standard while having required strength in concrete mixing and to implement quality control. Apparatus for sorting and washing the aggregate suitable for the present invention and aggregate collection method thereby.

In general, coarse aggregates used for concrete in government standard specifications and Korean Industrial Standards (KS F 4009) related to concrete construction should not contain foreign substances such as fine powder, and the salt (NaCl) limit is 0.04% or less. The 100% remaining on the 5mm screen (5mm screen) is to be used for the determination of the specification.

Therefore, fine powder and organic impurities contained in the aggregate are one of the important factors to lower the quality of concrete. Accordingly, the quality control items of aggregates include organic impurities and fine powders of 0.08 mm or less. Therefore, the cleaning of aggregates used in the production of concrete is one of the most important requirements in producing high quality concrete.

However, the reality of the site for producing concrete is very different from the reality. That is, in most sites, when aggregate is supplied, it is used for concrete production immediately after being piled up without a separate washing process. This may be due to a variety of causes, but the difficulty of the cleaning method is one of the big reasons. This is because most ready-mixed concrete plants cannot be equipped with a separate washing facility due to the narrowness of the place and cannot follow the yield of the washing amount according to the continuous production process.

Accordingly, it is necessary to develop a facility capable of washing aggregate in a narrow place and continuously washing a large amount of aggregate.

In addition, in the preparation of ready-mixed concrete in the field with respect to the particle size of the aggregate, the residual amount of 5mm sieve is allowed to be 85% or more, and it is determined to be converted into the amount of fine aggregate, but the balance corresponding to the converted amount is considered to be substantially fine fine aggregate. There is no.

On the other hand, when it is necessary to evaluate the properties of concrete under standard conditions, such as a laboratory, only 5mm sieve residual amount should be used as a coarse aggregate, unlike the above-mentioned ready-mixed concrete, so most of the methods have been performed to wash and sift water depending on manpower. . However, this method is extremely low efficiency and takes a lot of time and effort.

Until now, various types of concrete management equipment have been developed for various quality control items, but there have been no developed or reported cases for removing foreign matters and fines from coarse aggregates. And a problem with the screening method is as follows.

Conventional aggregate cleaning method is to put the aggregate in the hearth (floor) or a general mixer (mixer) to take a method of washing while rotating the mixer or water spray. However, at this time, it is difficult to select aggregates other than foreign matters and the required particle size contained in the aggregates.

In addition, in the case of the conventional earth and sand size selection device, aggregates are sorted using a drum perforated network, and the sorting material is transported by a drum angle of 0 to 6 °, and the classification is performed by rotating and falling due to the characteristics of the sorting material. To be done. However, this method has a problem in collecting the high-quality aggregate required for concrete production because the classification is made only by the drum angle and the characteristics of the screening material.

In addition, the conventional ready-mixed concrete recovery and recycling apparatus is a method of immersing the sorting material in water by means of a perforated network and a screw-type drum inner blade to wash and transport it. However, due to the nature of the selective material containing a large amount of water, the submerged method of immersing in the water to wash the screening material is not a complete cleaning because it comes in contact with the contaminated water in the final discharge process. In other words, in the situation where supply of high-quality aggregates is difficult as in recent years, aggregates containing high amounts of fines and organic matters, which are directly sent from the mountain region, are poorly removed due to the underwater immersion method, so that high-quality concrete can be obtained. none.

As described above, it is difficult to collect the aggregate (ie, the aggregate of good quality) in which the required particle size range and foreign matters are removed by the conventional method. Accordingly, when a good aggregate is not used when concrete is mixed, concrete that does not have required strength may be mass-produced, resulting in deterioration of concrete quality.

Therefore, the present invention has been proposed to solve the above problems, in the manufacture of concrete for experiments or ready-mixed concrete, while adhering to the aggregate surface while selecting the aggregate of the required particle size range through the trommel screen and high pressure water of the rotating drum Apparatus for sorting and cleaning aggregates suitable for manufacturing concrete that continuously removes foreign matters such as fine powders, and accordingly produces high quality concrete that meets a predetermined standard while having required strength in concrete mixing Its purpose is to provide a method for collecting aggregates.

The present invention to achieve the above object, the support frame; A first sorting means rotatably installed on the support frame and configured to selectively discharge foreign matter and aggregates having a predetermined particle size and aggregates having a predetermined particle size among aggregates introduced into the support frame; An aggregate moving member installed in the first selection means to move the aggregate inside in one direction during the rotational operation of the first selection means; An input unit provided on one side of the first sorting means to inject aggregate into the first sorting means; A second sorting means provided between the input portion and the first sorting means for pre-selecting aggregates having a required particle size range or more; Washing means for washing the aggregate installed in the first selection means moved by the aggregate moving member; A discharge part installed to face the input part to discharge the aggregate selected by the first selection means and the washing means; And it provides a device for sorting and washing the aggregate suitable for the production of concrete including a drive means for rotating the first selection means.

In addition, the present invention may further include a fine discharge outlet which is installed in the lower portion of the first selection means for discharging the foreign matter and the aggregate less than the required particle diameter and the washing treatment water selected from the first selection means to a predetermined position.

The first selection means may include a rotation drum (rotational drum) formed in a cylindrical shape and having a hollow portion formed to penetrate the predetermined aggregate selected by the second selection means; A trommel screen in which the outer circumferential surface of the rotating drum has a mesh shape so as to discharge foreign substances attached to the aggregate and aggregate less than the required particle size to the outside when the rotating drum is rotated; And a rotation interlocking portion formed at one end of an outer circumferential surface of the rotating drum such that the rotating drum is rotated by a driving means.

The aggregate moving member includes a plurality of screw blades formed on the inner circumferential surface of the rotating drum such that the aggregate selected by the trommel screen and the aggregate washed by the washing means are naturally transferred from the input side to the discharge side in the rotating drum. Can be done.

The first selection means may include a plurality of auxiliary rollers, one end of which is installed outside the rotating drum and the other end of which is supported by the support frame so that the rotating drum rotates without shaking; And one end contacting the rotating drum to prevent clogging of the trommel screen when foreign matter attached to the aggregate through the trommel screen and aggregate less than the required particle size is discharged to the outside and the other end is connected to the support frame. It may further comprise a rotary brush (rotary brush) supported by.

The washing means, washing operation means for operating the washing means; A water supply pipe disposed in a hollow portion of the rotating drum such that the washing water pumped by the washing operation means flows in order to wash the aggregate selected by the trommel screen; A plurality of water spray nozzles connected to the water supply pipe so that the washing water flowing through the water supply pipe is entirely sprayed from the hollow of the rotary drum; And a water supply pipe connecting the washing operation means and the water supply pipe to water the washing water pumped by the washing operation means to the water supply pipe.

Here, the washing operation means may be made of a motor pump to operate the washing means.

The driving means, the motor for transmitting a driving force to the rotating drum; A power transmission gear provided to the motor such that the driving force of the motor is transmitted to the rotating linking unit of the rotating drum and engaged with the rotating linking unit to rotate the rotating drum; And it may include a control unit for controlling the drive force transmission by the motor.

In addition, the present invention is to put the aggregate into the input unit to extract the aggregate more than the required particle size range by the second selection means to the outside; The predetermined aggregate selected by the second sorting means is put into a rotating drum to discharge the foreign matter attached to the aggregate by the trommel screen and aggregate less than the required particle size range to the outside; The aggregate selected by the trommel screen is washed by the water spray nozzle of the water supply pipe in the rotating drum; The aggregate screened by the trommel screen and washed by the water spray nozzle is provided by the blade is transported from the input side of the rotating drum to the discharge side to provide a method for collecting aggregate suitable for the production of concrete discharged to the discharge portion.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings.

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

1 is a block diagram showing a device for sorting and washing aggregate suitable for producing concrete according to the present invention, Figure 2 is a cross-sectional view showing the device shown in FIG.

As shown in Figures 1 and 2, the present invention is implemented to continuously remove foreign matters such as fine powder adhered to the aggregate surface while screening the aggregate of the required particle size range through the trommel screen and high pressure water of the rotating drum, Apparatus for sorting and washing aggregate suitable for producing concrete according to the present invention, the support frame (not shown); A first selection means (200) rotatably installed in the support frame and configured to selectively discharge foreign matter and aggregates having a predetermined particle size and aggregates less than a required particle size from among aggregates (not shown) introduced into the support frame; An aggregate moving member (240) installed in the first selection means (200) to move the aggregate inside in one direction during the rotation driving of the first selection means (200); An input unit 100 provided at one side of the first sorting means 200 to inject aggregate into the first sorting means 200; Second sorting means (not shown) provided between the input part 100 and the first sorting means 200 to pre-select aggregates having a required particle size range or more; Washing means (300) installed in the first sorting means (200) for washing aggregate moved by the aggregate moving member (240); A discharge part 600 installed to face the input part 100 so that the aggregate selected by the first selection means 200 and the washing means 300 is discharged; And driving means 500 for driving the first selection means 200 to rotate.

Aggregate suitable for producing concrete according to the present invention means aggregate having a diameter of 5mm, it is necessary to extract the aggregate outside the required particle size range.

Accordingly, in the present embodiment, when the aggregate is not selected in the input unit 100, the aggregate of more than the required particle size range (that is, 5mm or more and 25mm or less) is primarily selected by vibrating the second sorting means. It is put into the first selection means 200 (that is, the rotating drum 210). That is, the process of screening aggregates that exceed the regulations in the first stage is in progress.

Installed in the lower portion of the first sorting means 200 and the foreign matter selected from the first sorting means 200 and aggregates of less than the required particle size range and the washing treatment water sprayed and treated in the washing means 300 is a predetermined position Further comprising a differential discharge port 700 to discharge to.

In other words, the differential discharge port 700 serves to drain the remaining water that is washed by the foreign matter and fine aggregate and the cleaning means 300 and the like finally discharged by the apparatus.

Figure 3 is a perspective view showing the sorting means and washing means that is the main part of the screening and washing apparatus for the aggregate suitable for producing concrete according to the present invention.

As shown in Figs. 1 to 3, the first sorting means 200 has a hollow portion 220 which is formed to penetrate so that a predetermined aggregate selected by the second sorting means is introduced into a cylindrical shape. Rotating drum 210 is rotated; A trommel screen 230 having an outer circumferential surface of the rotating drum 210 having a mesh shape so as to discharge the foreign matter attached to the aggregate and the aggregate less than the required particle size to the outside when the rotating drum 210 is rotated; And a rotation interlocking part (ie, gear tooth 250) formed at one end of an outer circumferential surface of the rotating drum 210 so that the rotating drum is rotated by the driving means 500.

In addition, the aggregate moving member is selected by the trommel screen 230 and the aggregate to be washed by the washing means 300, the rotary drum 210 so that the naturally transported from the input side to the discharge side in the rotating drum (210) It consists of a plurality of screw-shaped blades 240 formed on the inner peripheral surface of the.

In this embodiment, the trommel screen 230 of the rotating drum 210 is preferably made of a material of the iron plate to minimize the deformation that may occur due to the fall of the aggregate, the thickness of the iron plate is about 3mm proper. In addition, the trommel screen 230 of the rotating drum 210 is preferably made of a stainless material so as to prevent corrosion when the high pressure spraying of the cleaning means (300).

In addition, in the present embodiment, the mesh-shaped hole of the trommel screen 230 drills holes with a diameter of 5 mm at regular intervals so as to discharge foreign matters such as fine aggregates and fine powders of less than or equal to (ie, fine aggregates or less). .

In addition, a predetermined aggregate introduced into the rotating drum 210 is selected by the eromel screen 230 at the time of rotation of the rotating drum 210 and sprinkled by the washing means 300 to naturally discharge into the discharge part 600. An aggregate moving member (ie, a plurality of blades 240) is formed on an inner circumferential surface of the rotating drum 210 to be transferred.

Here, the blade 240 is preferably made of a stainless steel material to prevent the deformation caused by the aggregate and the corrosion by watering.

The washing means 300, washing operation means 400 for operating the washing means 300; A water supply pipe 310 disposed in the hollow part 220 of the rotating drum such that the washing water pumped by the washing operation means 400 flows to wash the aggregate selected by the trommel screen 230; A plurality of water spray nozzles 320 connected to the water supply pipe 310 such that the washing water flowing through the water supply pipe 310 is generally sprayed from the hollow part 220 of the rotary drum; And a water supply pipe 330 connecting between the cleaning operation means (ie, the motor pump 410) and the water supply pipe 310 to water the washing water pumped by the cleaning operation means 400 to the water supply pipe 310. It includes.

In this embodiment, the water supply pipe 310 is made independently of the rotating drum 210 to continuously supply the washing water for continuous washing of the aggregate in the hollow portion 220 of the rotating drum. In addition, the spray nozzle 320 is connected to the water supply pipe 310 so that the washing water can be diffused in the rotary drum 210 as a whole, which may be omitted.

In addition, the water supply pipe 310 may be disposed at any position in the hollow portion 220 of the rotating drum if the aggregate can be sprayed and washed in the rotating drum 210.

In addition, the washing operation means 400 is composed of a motor pump 410 to operate the washing means 300.

That is, the pumping is made by the motor pump 410 so that the water is supplied to the water supply pipe 310 through the main water pipe 330 is diffused in the rotating drum 210 by the water spray nozzle 320. Accordingly, high pressure water is made by the water spray nozzle 320 to wash the aggregate in the rotating drum 210.

4 is a cross-sectional side view of the apparatus shown in FIG.

As shown in Figures 1 to 4, the first selection means 200 is one end is installed on the outside of the rotating drum 210 so that the rotating drum 210 is rotated without shaking and the other end is supported by the support frame A plurality of auxiliary rollers 260 to be rotated; And one end is in contact with the rotating drum 210 to prevent clogging of the trommel screen 230 when foreign matter attached to the aggregate through the trommel screen 230 and aggregate less than the required particle size are discharged to the outside. The other end further includes a rotary brush 270 is supported by the support frame.

That is, the auxiliary roller 260 is mounted on the outside of the rotating drum 210 to realize stability so that the rotating drum 210 can be rotated without shaking. In addition, the rotary drum 210 while continuously rotating the foreign matter attached to the aggregate through the trommel screen 230 and aggregate less than the required particle size range (that is, aggregate less than 5mm) to the outside when the In order to prevent clogging of the trommel screen 230, the rotary brush 270 is installed in contact with the rotating drum (ie, the trommel screen 230) so that the trommel screen continuously while the rotating drum 210 is rotated. Prevent blockage of 230.

In addition, foreign matter attached to the aggregate discharged to the outside through the trommel screen 230 and aggregates less than the required particle size range (that is, aggregate less than 5mm) and the water remaining after being washed by the spray nozzle (320) , Washing treatment water) is discharged through the fine discharge port (700).

The driving means 500, the motor 510 for transmitting a driving force to the rotating drum (210); The driving force of the motor 510 is transmitted to the rotation interlocking part of the rotating drum (that is, the gear tooth 250) to be meshed with the gear tooth 250 to be provided in the motor 510 to rotate the rotating drum 210. Power transmission gear 520; And a control unit 530 for controlling the transmission of the driving force by the motor 510.

In this embodiment, the driving force for rotating the rotating drum 210 is generated by the motor 510 is transmitted to the power transmission gear 520. In addition, the power transmission gear 520 meshes with a rotational linking unit (ie, gear tooth 250) of the rotating drum to transmit a driving force to rotate the rotating drum 210.

In addition, by installing a control unit 530 for controlling the transmission of the driving force of the motor 510 to be properly controlled when driving the device of the present invention.

In addition, in order to protect the rotating drum 210 and the cleaning means 300, which is the main part of the apparatus according to the present invention, it is preferable to protect the rotating drum 210 with the rotating drum cover 280.

In addition, it is preferable that the roller 800 is provided at the lower end of the apparatus to be movable.

Aggregate sorting and washing apparatus suitable for manufacturing concrete according to the present invention is related to the production yield in the installation, but it is configured to be installed if only an area of about 2 ~ 3 pyeong (10㎡), continuous cleaning It is a suitable device for on-site cleaning because it is able to clean a large amount of aggregate.

Hereinafter, with reference to the accompanying drawings will be described an aggregate collection method suitable for producing concrete of the present invention configured as described above.

As shown in Figures 1 to 4, the aggregate is not screened into the input unit 100, the aggregate of the required particle size range (that is, 5mm or more and 25mm or less) by the vibration of the second selection means (not shown). Extract to the outside. Power generated by the motor 510 is transmitted to the power transmission gear 520 and the power transmission gear 520 is rotated in engagement with the rotary linkage (ie, gear tooth 250) of the rotating drum ( Predetermined aggregate selected by the second selection means is input to 210 to discharge the foreign matter attached to the aggregate by the trommel screen 230 and the aggregate less than the required particle size range (ie, 5 mm or less) to the outside. Aggregate selected by the trommel screen 230 is washed by the spray nozzle 320 of the water supply pipe 310 in the rotating drum (210). Aggregate (ie, aggregate of good quality) that is sorted by the trommel screen 230 and washed by the water spray nozzle 320 is transferred from the input side of the rotating drum 210 to the discharge side by the blade 240 to be discharged. It is discharged to the part 600. In addition, foreign matters such as fine powder filtered by the trommel screen 230 and the fine aggregate and the water spray nozzle 320 and the remaining water (that is, the washing water) are discharged to the fine discharge port 700.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

As described above, according to the present invention, in the manufacture of concrete for experiment or ready-mixed concrete, the foreign matter such as fine powder attached to the aggregate surface continuously while selecting the aggregate of the required particle size range through the trommel screen of the rotating drum and high pressure spraying It can be removed.

In addition, according to the present invention, there is also an effect of producing a quality concrete that meets a predetermined standard while having required strength when concrete is mixed, and implementing quality control.

In addition, the present invention can utilize low-grade aggregates in accordance with the aggregate supply shortage for concrete, can improve the production of high-quality aggregates and secure the quality of concrete, and reduce the effort due to the removal of foreign matters such as the required particle size selection and fine powder Not only can it improve the efficiency in manufacturing ready-mixed concrete and experimental concrete.

Claims (10)

Support frame; A first sorting means rotatably installed on the support frame and configured to selectively discharge foreign matter and aggregates having a predetermined particle size and aggregates having a predetermined particle size among aggregates introduced into the support frame; An aggregate moving member installed in the first selection means to move the aggregate inside in one direction during the rotational operation of the first selection means; An input unit provided on one side of the first sorting means to inject aggregate into the first sorting means; A second sorting means provided between the input portion and the first sorting means for pre-selecting aggregates having a required particle size range or more; Washing means for washing the aggregate installed in the first selection means moved by the aggregate moving member; A discharge part installed to face the input part to discharge the aggregate selected by the first selection means and the washing means; And Drive means for rotationally driving the first selection means; Apparatus for sorting and washing aggregate suitable for manufacturing concrete comprising a. The method of claim 1, Differential discharge outlet which is installed in the lower portion of the first sorting means and discharges the foreign matter and the aggregate and less than the required particle diameter selected from the first sorting means to a predetermined position Apparatus for sorting and washing aggregate suitable for producing concrete further comprising. The method of claim 1, The first selection means is A rotating drum having a hollow portion formed to penetrate such that predetermined aggregates selected by the second selecting means are inserted thereinto, and having a cylindrical shape; A trommel screen having an outer circumferential surface of the rotating drum in the form of a mesh so as to discharge foreign substances attached to the aggregate and aggregate less than the required particle size to the outside when the rotating drum is rotated; And Rotating interlocking portion formed on one end of the outer peripheral surface of the rotating drum so that the rotating drum is rotated by a drive means Apparatus for sorting and washing aggregate suitable for manufacturing concrete comprising a. The method of claim 3, The aggregate moving member is It consists of a plurality of screw-type blades formed on the inner peripheral surface of the rotating drum so that the aggregate screened by the trommel screen and washed by the cleaning means is naturally transferred from the input side to the discharge side in the rotating drum Apparatus for sorting and cleaning aggregates suitable for manufacturing concrete. The method of claim 4, wherein The first selection means is A plurality of auxiliary rollers, one end of which is installed on the outside of the rotating drum so that the rotating drum rotates without shaking, and the other end is supported and rotated by the support frame. Apparatus for sorting and washing aggregate suitable for producing concrete further comprising. The method of claim 5, The first selection means is The foreign matter attached to the aggregate through the trommel screen and aggregate less than the required particle size range is installed in contact with the rotating drum one end to prevent clogging of the trommel screen and the other end by the support frame Supported rotating brush Apparatus for sorting and washing aggregate suitable for producing concrete further comprising. The method of claim 6, The washing means is Washing operation means for operating the washing means; A water supply pipe disposed in a hollow portion of the rotating drum such that the washing water pumped by the washing operation means flows for washing the aggregate selected by the trommel screen; A plurality of water spray nozzles connected to the water supply pipe so that the washing water flowing through the water supply pipe is entirely sprayed from the hollow of the rotary drum; And A main water pipe connecting between the washing operation means and the water supply pipe to feed the washing water pumped by the washing operation means to the water supply pipe. Apparatus for sorting and washing aggregate suitable for manufacturing concrete comprising a. The method of claim 7, wherein The washing operation means Made of a motor pump to operate the washing means. Apparatus for sorting and cleaning aggregates suitable for manufacturing concrete. The method of claim 8, The driving means A motor for transmitting a driving force to the rotating drum; A power transmission gear provided to the motor such that the driving force of the motor is transmitted to the rotating linking unit of the rotating drum and engaged with the rotating linking unit to rotate the rotating drum; And Control unit for controlling the driving force transmission by the motor Apparatus for sorting and washing aggregate suitable for manufacturing concrete comprising a. Injecting the aggregate into the input unit to extract the aggregate beyond the required particle size range by the second sorting means; The predetermined aggregate selected by the second sorting means is put into a rotating drum to discharge the foreign matter attached to the aggregate by the trommel screen and aggregate less than the required particle size range to the outside; The aggregate selected by the trommel screen is washed by the water spray nozzle of the water supply pipe in the rotating drum; Aggregate selected by the trommel screen and washed by the spray nozzle is transferred from the input side of the rotating drum to the discharge side by the blade and discharged to the discharge part. Aggregate picking method suitable for the manufacture of concrete.

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