KR102230028B1 - Apparatus for recovering and recycling powder and powder recovery method using the same - Google Patents

Abstract

The present invention relates to an apparatus for recovering and recycling powder and a powder recovery method using the same, capable of reducing a cost. According to the present invention, the apparatus for recovering and recycling the powder includes: a recovery unit; a first transfer unit; a first sorting unit; a second transfer unit; a second sorting unit; a third transfer unit; and a gas supply unit.

Description

Powder recovery and regeneration device and powder recovery method using the same {Apparatus for recovering and recycling powder and powder recovery method using the same}

The present invention relates to an apparatus for recovering and recovering powder and a method for recovering powder using the same, and to an apparatus for recovering, classifying and regenerating residual powder that has not been molded in a 3D printer.

The 3D printer is the same as the principle of printing a 2D image (type or picture) by spraying ink onto the paper surface when a digitized file is transmitted from an inkjet printer. A 2D printer only moves back and forth (x-axis) and left-right (y-axis), but a 3D printer creates a three-dimensional article based on the input 3D drawing by adding up and down (z-axis) motion to it.

Types of 3D printers include Selective Laser Sintering (SLS) and Direct Metal Deposition (DMD). Selective Laser Sintering (SLS) is capable of manufacturing complex shapes by applying metal powder and melting only the desired part, but it takes a long time and has a limitation in manufacturing size, and Direct Metal Deposition (DMD) is a laser. It is a method of melt-lamination by spraying powder directly at the same time as a heat source. The lamination speed is fast, but it is difficult to implement a complex shape, and post-processing is necessary due to low precision.

Meanwhile, the 3D printer industry is growing rapidly, and the biggest change in relation to 3D printer materials is the metal 3D printer market. Plastic materials have been the most widely and commonly used materials in 3D printers, but the use of metal materials in the 3D printer market is expected to increase in the future.

However, the prior art has the following problems.

In particular, raw materials using nylon or plastic materials and metal minerals used in 3D printers are expensive materials depending on the material, but there are many powders that are discarded without using residual powder after molding in 3D printers.

Registered Patent No. 10-1901773

In order to solve the above-described problem, an object of the present invention is a powder recovery and regeneration apparatus for recovering residual powder after molding in a 3D printer, classifying it by size, and classifying reusable powder and non-reusable powder in a 3D printer, and using the same. It is to provide a powder recovery method.

In order to achieve the above object, a powder recovery and regeneration apparatus according to the present invention and a powder recovery method using the same include: a recovery unit connected to a 3D printer to recover residual powder; A first transfer unit for transferring the powder recovered from the recovery unit; A first sorting part connected to the first transfer part and provided inclined in a sieve shape to classify powder according to size; A second transfer unit connected to the first selection unit to transfer the powder passing through the first selection unit; A second separating unit connected to the second transfer unit to form a plurality of circular holes spaced apart from each other at a predetermined interval, and for separating spherical powder; A third transfer part connected to the second sorting part and transferring the powder passing through the second sorting part; And a gas supply unit supplying an inert gas to the inside of the recovery unit, the first transfer unit, the second transfer unit, the third transfer unit, and the first and second separation units, and the second separation unit has a space therein. Is provided, and the body portion whose cross-sectional area becomes narrower toward the lower side; A first fixing part provided inside the body part, in which a plurality of first fixing units formed in a plate shape so as to have a groove in a hemispherical shape on one side and a hemispherical shape are formed in a length direction; A second fixing portion provided inside the body portion, formed to have a plate-shaped groove in a hemispherical shape on one side, and a plurality of second fixing units provided with the body portion formed on the other side in the longitudinal direction; A plurality of rotation units are provided between the first fixing part and the second fixing part, and a plurality of rotation units formed in a column shape to have a hemispherical groove on a side surface thereof are formed in a longitudinal direction, and a rotation part capable of rotating in one direction; It is characterized by being.

And a vibration unit provided on one side of the first and second selection units.

A fourth transfer unit transferring powder that has not passed through the first selection unit to one side of the first selection unit; A fifth transfer unit transferring the powder that has not passed through the second selection unit to one side of the second selection unit; A sixth transfer unit discharging powder that has not passed through the second selection unit to one side of the second selection unit; A first damper provided on one side of the second sorting part and controlling the powder that has not passed through the second sorting part to be transferred to the fifth transfer part or the sixth transfer part; A pulverizing unit for pulverizing the powder transferred through the fourth or fifth transfer unit; A seventh transfer unit connected to the pulverization unit and transferring the powder pulverized by the pulverization unit to the first transfer unit to re-inject the powder to the first selection unit; An eighth transfer unit connected to the pulverization unit and transferring the powder pulverized by the pulverization unit to the second transfer unit to re-inject the powder to the second selection unit; A second damper provided in the pulverizing unit and controlling the powder pulverized by the pulverizing unit to be transferred to the seventh transfer unit or the eighth transfer unit; It characterized in that it further comprises a; a control unit for controlling the operation of the first damper and the second damper.

A first step of recovering the remaining powder of the 3D printer in the recovery unit; A second step of transferring the powder from the first transfer unit to the first selection unit; A third step of classifying the powder by size in the first sorting unit; A fourth step of transferring the powder selected by the first sorting part from the second conveying part to a second sorting part; A fifth step of classifying the spherical powder in the second sorting unit; A sixth step of transferring the spherical powder passing through the second sorting part to a third conveying part; A seventh step of transferring the powder that has not passed through the first sorting unit in the third step from a fourth transfer unit to a pulverization unit; An eighth step of pulverizing the powder in the pulverizing unit; A ninth step of transferring the powder to the first transfer unit through the seventh transfer unit by operating a second damper in the control unit; A tenth step of classifying the powder by size in the first sorting unit; And an eleventh step of transferring the powder that has not passed through the first sorting part in the tenth step to a fourth transfer part.

In the fifth step, a twelfth step of transferring the powder that has not passed through the second sorting part to a fifth transfer part by operating the first damper in the control part; A thirteenth step of pulverizing the powder transferred from the fifth transfer unit in the pulverizing unit; A 14th step of transferring the pulverized powder to the second transfer unit by operating the second damper in the control unit to the second transfer unit; A fifteenth step of classifying the spherical powder in the second sorting unit; In the fifteenth step, a sixteenth step of transferring the powder that has not passed through the second sorting unit to a sixth transfer unit by operating the first damper in the control unit.

The powder recovery and regeneration apparatus according to the present invention and the powder recovery method using the same have the following effects.

There is an effect of reducing cost by classifying expensive powders so that they can be reused.

1 is a view showing the configuration of a powder recovery and regeneration apparatus according to the present invention.
2 is a view showing the powder recovery and regeneration apparatus according to the present invention, (a) is a front view of the second sorting portion, (b) is a view showing a portion of the second sorting portion cut away.

Hereinafter, a preferred embodiment of a powder recovery and recovery apparatus and a powder recovery method using the same according to the present invention will be described in detail with reference to the accompanying drawings.

The powder recovery and regeneration apparatus according to the present invention includes a recovery unit 10 connected to a 3D printer to recover residual powder, a first transfer unit 20 transferring the powder recovered from the recovery unit 10, and the first transfer unit. The first sorting part 30 connected to 20 and provided inclined in a sieve shape to classify the powder according to the size, and the powder passing through the first sorting part 30 by being connected to the first sorting part 30 The second transfer unit 40 for transferring the cells, the second transfer unit 40 is connected to the second transfer unit 40 to form a plurality of circular holes spaced apart from each other at a predetermined interval, and a second sorting unit 50 for separating the spherical powder, the second A third transfer unit 60 connected to the sorting unit 50 to transfer the powder passing through the second separating unit 50, the recovery unit 10, the first transfer unit 20, and the second transfer unit ( 40), a third transfer unit 60 and a gas supply unit 70 for supplying an inert gas into the first and second screening units 30 and 50.

3D printers can be largely divided into Selective Laser Sintering (SLS) and Direct Metal Deposition (DMD) methods. In the case of Selective Laser Sintering (SLS), the particle size must be uniform and fluidity is required because the work to flatten the powder is required. It is necessary to use a spherical powder. In the case of Direct Metal Deposition (DMD), it must be kept large enough to pass through the nozzle, and it can be used even if the powder particles are relatively non-uniform than the Selective Laser Sintering (SLS). In the present invention, the powder remaining after molding in the 3D printer can be recovered and classified so that it can be recycled into powder suitable for the characteristics of the 3D printer.

First, the recovery unit 10 is provided. The recovery unit 10 is connected to a 3D printer to recover the remaining powder after molding in the 3D printer. The recovery unit 10 may recover the powder from the 3D printer by air pressure, rollers, blades, etc., but is not limited thereto.

A first transfer unit 20 is provided by being connected to the recovery unit 10. The first transfer unit 20 moves the powder collected by the recovery unit 10 to a predetermined position. The first transfer unit 20 moves the powder to the first selection unit 30 to be described below.

A first sorting part 30 is provided by being connected to the first transfer part 20. The first selection part 30 is formed to be inclined in a body shape. The first sorting part 30 classifies the powder transferred by the first transfer part 20 by size, and removes the powder of large particles agglomerated by laser sintering or the like.

A vibration unit 31 is further provided in the first selection unit 30. The vibrating unit 31 is provided on one side of the first separating unit 30 and generates vibration to facilitate the movement of the powder in the first separating unit 30. The vibration unit 31 may further include an ultrasonic generator, so that the powder moves smoothly.

A second transfer part 40 is provided below the first sorting part 30. The second transfer part 40 moves the powder from which the powder agglomerated in the first sorting part 30 is removed to a predetermined position. The second transfer unit 40 moves the powder to the second sorting unit 50 to be described below.

A fourth transfer unit 32 is further provided on one side of the first selection unit 30. The fourth transfer unit 32 moves the powder of large particles that has not passed through the first sorting unit 30 to a predetermined position. Here, a third damper (not shown) may be further provided in the fourth transfer unit 32, and the powder may be transferred to the pulverizing unit 100 to be described below or the powder may be discharged to the outside.

Here, the powder discharged through the fourth transfer unit 32 is difficult to maintain a spherical powder shape even if it is pulverized into powder that is excessively agglomerated by a laser, it can be used in a powder metallurgy process of melting and producing powder.

A second sorting part 50 is provided by being connected to the second transfer part 40. The second sorting part 50 is provided with a plurality of circular holes spaced at regular intervals to sort the spherical powder. Since the powder used in the 3D printer must have uniform particles and excellent fluidity, only spherical powder can be reused.

The second sorting part 50 may be configured in various ways for the above-described functions, and in the present invention, a space is provided inside, and the body part 51 and the body part 51 have a narrower cross-sectional area toward the bottom. The first fixing unit 52 is provided inside, the body part 51 is provided on one side in a plate shape, and a first fixing unit 52a formed to be grooved in a hemispherical shape on the other side is formed in a plurality of longitudinal directions. , A plurality of second fixing units 53a are provided in the body part 51 and are formed to have a hemispherical groove on one side in a plate shape, and a second fixing unit 53a provided with the body part 51 on the other side. A plurality of rotation units 54a provided between the second fixing part 53 and the first fixing part 52 and the second fixing part 53 and formed to have a hemispherical groove on the side in a column shape. It is formed in a plurality in the longitudinal direction, and is composed of a rotating portion 54 that can be rotated in one direction.

As shown in FIG. 2, a body portion 51 is provided in the second selection portion 50. The body portion 51 has a space therein, and the cross-sectional area becomes narrower as it goes downward.

In addition, a first fixing part 52 is provided in the second sorting part 50. The first fixing part 52 is formed inside the body part 51, and a plurality of first fixing units 52a are formed in the longitudinal direction. The first fixing unit 52a is formed in a plate shape, the body portion 51 is provided on one side, and a groove is formed in a hemispherical shape on the other side.

In addition, a second fixing part 53 is provided in the second sorting part 50. The second fixing part 53 is formed inside the body part 51, and a plurality of second fixing units 53a are formed in the longitudinal direction. The second fixing unit 53a is formed in a plate shape, a groove is formed in a hemispherical shape on one side, and the body portion 51 is provided on the other side.

A rotating part 54 is provided between the first fixing part 52 and the second fixing part 53. The rotation unit 54 has a plurality of rotation units 54a formed in the longitudinal direction. The rotation unit 54a is formed in a column shape to have a hemispherical groove on the side.

A plurality of rotation parts 54 may be provided between the first fixing part 52 and the second fixing part 53 as much as the width of the main body part. The rotating part 54 may rotate in one direction, and smoothly move the powder.

A vibration unit 55 is further provided in the second selection unit 50. The vibrating unit 55 is provided on one side of the second separating unit 50 and generates vibration to facilitate the movement of the powder in the second separating unit 50. The vibration unit 55 may further include an ultrasonic generator.

Accordingly, the spherical powder can be classified through grooves between the first fixing part 52 and the rotating part 54, between the rotating part 54, and between the rotating part 54 and the second fixing part 53. I can.

A third transfer part 60 is provided by being connected to the second sorting part 50. The third transfer part 60 is provided under the second sorting part 50 to move the spherical powder selected by the second sorting part 50, and the spherical powder is moved by the Selective Laser Sintering (SLS) method. It can be reused by putting it into a 3D printer.

A fifth transfer unit 80 is further provided on one side of the second selection unit 50. The fifth transfer unit 80 moves the powder that has not passed through the second selection unit 50 to a predetermined position. The fifth transfer unit 80 moves the powder to the pulverization unit 100 to be described below.

A sixth transfer unit 90 is provided on one side of the second selection unit 50. The sixth transfer unit 90 moves the pulverized powder to a predetermined position, and the powder passing through the sixth transfer unit 90 has a certain size, but is not a spherical powder, so the Direct Metal Deposition (DMD) method It can be reused by putting it into a 3D printer.

A first damper 56 is further provided at one side of the second sorting part 50. The damper controls the powder that has not passed through the second selection unit 50 to be transferred to the fifth transfer unit 80 or the sixth transfer unit 90.

The pulverization unit 100 is provided by being connected to the fourth transfer unit 32 and the fifth transfer unit 80. The pulverizing unit 100 pulverizes the transferred powder. The pulverizing unit 100 crushes the lumped powder under a certain pressure and separates the attached powder by sintering by a laser or the like.

A seventh transfer unit 110 is provided by being connected to the crushing unit 100. The seventh transfer unit 110 transfers the pulverized powder to the first transfer unit 20 to be re-introduced to the first selection unit 30.

It is connected to the pulverization unit 100 and the eighth transfer unit 120 is provided. The eighth transfer unit 120 transfers the pulverized powder to the second transfer unit 40 to be re-introduced to the second selection unit 50.

A second damper 130 is further provided in the crushing part 100. The second damper 130 controls the powder pulverized in the pulverization unit 100 to be transferred to the seventh transfer unit 110 or the eighth transfer unit 120.

In addition, a control unit 140 for controlling the operation of the first damper 56 and the second damper 130 is provided. The control unit 140 operates the second damper 130 to transfer the powder that has not passed through the first sorting unit 30 to the seventh transfer unit 110. The control unit 140 operates the second damper 130 so that the powder that has passed through the first sorting part 30 and which has not passed through the second sorting part 50 is transferred to the eighth transfer part 120 do. In addition, the control unit 140 passes the first sorting part 30, and in the case of the powder that does not pass through the second sorting part 50 more than a certain number of times, the first The damper 56 is operated. Here, the number of times the powder is pulverized through the control unit 140 may be limited.

In addition, a gas supply unit 70 is further provided, and the gas supply unit 70 includes the recovery unit 10, the first transfer unit 20, the second transfer unit 40, the third transfer unit 60, and the second transfer unit. Inert gas is supplied to the inside of the first sorting part 30 and the second sorting part 50, and the inert gas is supplied to the powder recovery and regeneration apparatus according to the present invention. Accordingly, it is possible to prevent the formation of an oxide or gas adsorption layer on the surface of the powder as the powder contacts air. Even if the powder is reused, its properties do not change.

Hereinafter, a powder recovery method using the powder recovery and regeneration apparatus manufactured according to the present invention will be described.

The powder recovery and regeneration apparatus and the powder recovery method using the same include a first step of recovering the remaining powder of the 3D printer in the recovery unit 10, and a first step of transferring the powder to the first sorting unit 30 from the first transfer unit 20. Step 2, the third step of classifying the powder by size in the first sorting part 30, the powder sorted in the first sorting part 30 to the second sorting part 50 in the second conveying part 40 The fourth step of transferring to, a fifth step of classifying the spherical powder in the second sorting part 50, transferring the spherical powder that has passed through the second sorting part 50 to the third conveying part 60 The sixth step, a seventh step of transferring the powder that did not pass through the first sorting part 30 in the third step from the fourth conveying part 32 to the pulverizing part 100, the powder in the crushing part 100 The eighth step of pulverizing the powder, the ninth step of transferring the powder to the first transfer unit 20 through the seventh transfer unit 110 by operating the second damper 130 in the control unit 140, the first selection The tenth step of classifying the powder by size in the part 30, the eleventh step of transferring the powder that has not passed the first sorting part 30 to the fourth transfer part 32 in the tenth step, the fifth step In the step, a twelfth step of transferring the powder that has not passed through the second sorting unit 50 to the fifth transfer unit 80 by operating the first damper 56 in the control unit 140, the fifth transfer unit In the thirteenth step of pulverizing the powder conveyed in 80 by the pulverizing unit 100, the second damper 130 is operated by the control unit 140 to obtain the pulverized powder through the eighth transfer unit 120. 2 The 14th step of transferring to the transfer part 40, the 15th step of classifying the spherical powder in the second sorting part 50, the powder that did not pass through the second sorting part 50 in the 15th step The controller 140 operates the first damper 56 and transfers it to the sixth transfer unit 90 in a sixteenth step.

First, in the first step, the recovery unit 10 recovers the remaining powder of the 3D printer. The recovery unit 10 recovers the remaining powder after molding in the 3D printer.

In the second step, the powder recovered by the first transfer unit 20 is transferred to the first sorting unit 30.

In the third step, the first sorting unit 30 classifies the powder according to its size. Here, the first sorting part 30 is further provided with a vibrating part 31 to facilitate the movement of the powder. In addition, the large-particle powder is transferred to the fourth transfer unit 32, and the small-particle powder is transferred to the second transfer unit 40.

In the fourth step, the powder of small particles that have passed through the first sorting part 30 is transferred from the second conveying part 40 to the second sorting part 50.

In the fifth step, the second sorting unit 50 classifies the spherical powder. The rotating part 54 rotates in one direction in the second sorting part 50 to facilitate the movement of the powder, and the second sorting part 50 is further provided with a vibrating part 55 to facilitate the movement of the powder. do. Further, the spherical powder is transferred to the third transfer unit 60, and the powder that does not pass through the second sorting unit 50 is transferred to the fifth transfer unit 80 or the sixth transfer unit 90.

In the sixth step, the spherical powder that has passed through the second sorting unit 50 is transferred from the third transfer unit 60 to an elective laser sintering (SLS) type 3D printer.

In the seventh step, the powder that has not passed through the first sorting part 30 in the third step is transferred from the fourth conveying part 32 to the pulverizing part 100.

In the eighth step, the powder is pulverized in the pulverizing unit 100.

In the ninth step, the control unit 140 operates the second damper 130 to transfer the powder to the first transfer unit 20 through the seventh transfer unit 110. The powder is re-introduced into the first sorting part 30.

In the tenth step, the second sorting unit 50 classifies the powder according to its size. Here, the first sorting part 30 is further provided with a vibrating part 31 to facilitate the movement of the powder.

In the eleventh step, the powder that has not passed through the first sorting part 30 in the tenth step is transferred to the fourth transfer part 32. Here, the powder can be transferred to the pulverization unit 100 to return to the eighth step, and when the powder is excessively aggregated and it is not easy to separate the powders, the powder is discharged and melted to be used in the powder metallurgy process to make the powder. I can.

In the twelfth step, the powder that has not passed through the second sorting unit 50 in the fifth step is transferred to the fifth transfer unit 80 by operating the first damper 56 in the control unit 140.

In the thirteenth step, the powder transferred by the fifth transfer unit 80 is pulverized in the pulverizing unit 100.

In the 14th step, the control unit 140 operates the second damper 130 to transfer the powder to the second transfer unit 40 through the eighth transfer unit 120 roll. The powder is re-introduced into the second sorting part 50.

In the fifteenth step, the second sorting unit 50 classifies the spherical powder. The rotating part 54 rotates in one direction in the second sorting part 50 to facilitate the movement of the powder, and the second sorting part 50 is further provided with a vibrating part 55 to facilitate the movement of the powder. do.

In the sixteenth step, the powder that has not passed through the second sorting unit 50 in the fifteenth step is transferred to the sixth transfer unit 90 by operating the first damper 56. In the sixth transfer unit 90, the powder is transferred to a 3D printer of a direct metal deposition (DMD) method.

As described above, it will be appreciated that the above-described technical configuration of the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the present invention by those skilled in the art.

Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting, and the scope of the present invention appears in the claims to be described later rather than the detailed description, and the meaning and scope of the claims and their equivalents All changes or modifications derived from the concept should be construed as being included in the scope of the present invention.

10: collection unit 20: first transfer unit
30: first sorting unit 31: vibrating unit
32: 4th transfer unit 40: 2nd transfer unit
50: second sorting part 51: body part
52a: first fixing unit 52: first fixing unit
53a: second fixing unit 53: second fixing unit
54a: rotating unit 54: rotating part
55: vibration unit 56: first damper
60: third transfer unit 70: gas supply unit
80: 5th transfer unit 90: 6th transfer unit
100: grinding unit 110: 7th transfer unit
120: 8th transfer part 130: 2nd damper
140: control unit

Claims (5)

A recovery unit connected to the 3D printer to recover residual powder;
A first transfer unit for transferring the powder recovered from the recovery unit;
A first sorting part connected to the first transfer part and provided inclined in a sieve shape to classify powder according to size;
A second transfer unit connected to the first selection unit to transfer the powder passing through the first selection unit;
A second separating unit connected to the second transfer unit to form a plurality of circular holes spaced apart from each other at a predetermined interval, and for separating spherical powder;
A third transfer part connected to the second sorting part and transferring the powder passing through the second sorting part;
And a gas supply unit for supplying an inert gas to the inside of the recovery unit, the first transfer unit, the second transfer unit, the third transfer unit, and the first and second separation units, and
The second selection unit
A body portion having a space therein and having a narrower cross-sectional area as it goes downward;
A first fixing part provided inside the body part, in which a plurality of first fixing units formed in a plate shape so as to have a groove in a hemispherical shape on one side and a hemispherical shape are formed in a length direction;
A second fixing portion provided inside the body portion, formed to have a plate-shaped groove in a hemispherical shape on one side, and a plurality of second fixing units provided with the body portion formed on the other side in the longitudinal direction;
A plurality of rotation units are provided between the first fixing part and the second fixing part, and a plurality of rotation units formed in a column shape to have a hemispherical groove on a side surface thereof are formed in a longitudinal direction, and a rotation part capable of rotating in one direction; Powder recovery and regeneration device, characterized in that the. The method of claim 1,
A device for recovering and recovering powder, further comprising: a vibration unit provided on one side of the first and second selection units. The method of claim 1,
A fourth transfer unit transferring powder that has not passed through the first selection unit to one side of the first selection unit;
A fifth transfer unit transferring the powder that has not passed through the second selection unit to one side of the second selection unit;
A sixth transfer unit discharging powder that has not passed through the second selection unit to one side of the second selection unit;
A first damper provided on one side of the second sorting part and controlling the powder that has not passed through the second sorting part to be transferred to the fifth transfer part or the sixth transfer part;
A pulverizing unit for pulverizing the powder transferred through the fourth or fifth transfer unit;
A seventh transfer unit connected to the pulverization unit and transferring the powder pulverized by the pulverization unit to the first transfer unit to re-inject the powder to the first selection unit;
An eighth transfer unit connected to the pulverization unit and transferring the powder pulverized by the pulverization unit to the second transfer unit to re-inject the powder to the second selection unit;
A second damper provided in the pulverizing unit and controlling the powder pulverized by the pulverizing unit to be transferred to the seventh transfer unit or the eighth transfer unit;
And a control unit for controlling the operation of the first damper and the second damper. A recovery unit connected to the 3D printer to recover residual powder;
A first transfer unit for transferring the powder recovered from the recovery unit;
A first sorting part connected to the first transfer part and provided inclined in a sieve shape to classify powder according to size;
A second transfer unit connected to the first selection unit to transfer the powder passing through the first selection unit;
A second separating unit connected to the second transfer unit to form a plurality of circular holes spaced apart from each other at a predetermined interval, and for separating spherical powder;
A third transfer part connected to the second sorting part and transferring the powder passing through the second sorting part;
And a gas supply unit for supplying an inert gas to the inside of the recovery unit, the first transfer unit, the second transfer unit, the third transfer unit, and the first and second separation units, and
The second selection unit
A body portion having a space therein and having a narrower cross-sectional area as it goes downward;
A first fixing part provided inside the body part, in which a plurality of first fixing units formed in a plate shape so as to have a groove in a hemispherical shape on one side and a hemispherical shape are formed in a length direction;
A second fixing portion provided inside the body portion, formed to have a plate-shaped groove in a hemispherical shape on one side, and a plurality of second fixing units provided with the body portion formed on the other side in the longitudinal direction;
A plurality of rotation units are provided between the first fixing part and the second fixing part, and a plurality of rotation units formed in a column shape to have a hemispherical groove on a side surface thereof are formed in a longitudinal direction, and a rotation part capable of rotating in one direction; And
A vibration unit provided on one side of the first and second selection units; further includes,
A fourth transfer unit transferring powder that has not passed through the first selection unit to one side of the first selection unit;
A fifth transfer unit transferring the powder that has not passed through the second selection unit to one side of the second selection unit;
A sixth transfer unit discharging powder that has not passed through the second selection unit to one side of the second selection unit;
A first damper provided on one side of the second sorting part and controlling the powder that has not passed through the second sorting part to be transferred to the fifth transfer part or the sixth transfer part;
A pulverizing unit for pulverizing the powder transferred through the fourth or fifth transfer unit;
A seventh transfer unit connected to the pulverization unit and transferring the powder pulverized by the pulverization unit to the first transfer unit to re-inject the powder to the first selection unit;
An eighth transfer unit connected to the pulverization unit and transferring the powder pulverized by the pulverization unit to the second transfer unit to re-inject the powder to the second selection unit;
A second damper provided in the pulverizing unit and controlling the powder pulverized by the pulverizing unit to be transferred to the seventh transfer unit or the eighth transfer unit;
Further comprising; a control unit for controlling the operation of the first damper and the second damper,
A first step of recovering the remaining powder of the 3D printer in the recovery unit;
A second step of transferring the powder from the first transfer unit to the first selection unit;
A third step of classifying the powder by size in the first sorting unit;
A fourth step of transferring the powder selected by the first sorting part from the second conveying part to a second sorting part;
A fifth step of classifying the spherical powder in the second sorting unit;
A sixth step of transferring the spherical powder passing through the second sorting part to a third conveying part;
A seventh step of transferring the powder that has not passed through the first sorting unit in the third step from a fourth transfer unit to a pulverization unit;
An eighth step of pulverizing the powder in the pulverizing unit;
A ninth step of transferring the powder to the first transfer unit through the seventh transfer unit by operating a second damper in the control unit;
A tenth step of classifying the powder by size in the first sorting unit;
And an eleventh step of transferring the powder that has not passed through the first sorting part in the tenth step to a fourth transfer part. The method of claim 4,
In the fifth step, a twelfth step of transferring the powder that has not passed through the second sorting part to a fifth transfer part by operating the first damper in the control part;
A thirteenth step of pulverizing the powder transferred from the fifth transfer unit in the pulverizing unit;
A 14th step of transferring the pulverized powder to the second transfer unit by operating the second damper in the control unit to the second transfer unit;
A fifteenth step of classifying the spherical powder in the second sorting unit;
In the fifteenth step, a sixteenth step of transferring the powder that has not passed through the second sorting unit to a sixth transfer unit by operating the first damper in the control unit.

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