KR102160056B1 - 3d printing nozzle apparatus using uhpc material - Google Patents

Abstract

According to an embodiment of the present invention, provided is a 3D printing nozzle apparatus using an UHPC material, comprising: a nozzle device main body in which the UHPC material is introduced and received in an inner space and moves along a path corresponding to the shape data of a structure during 3D printing construction of the structure; a discharge nozzle provided with a nozzle discharge port for discharging the UHPC material received in the inner space of the nozzle device main body and configured to converge toward the nozzle discharge port at a lower portion of the nozzle device main body; and a nozzle heater disposed on the discharge nozzle and providing heat to the UHPC material passing through the inner space of the discharge nozzle to accelerate curing of the UHPC material discharged from the nozzle discharge port.

Description

3D printing nozzle device using UHPC material {3D PRINTING NOZZLE APPARATUS USING UHPC MATERIAL}

The present invention relates to a 3D printing nozzle device using a UHPC material, and more particularly, a structure such as a building can be integrated by 3D printing using a UHPC material (Ultra-High Performance Concrete), and quick settlement It relates to a 3D printing nozzle device using a UHPC material that can properly cure the UHPC material even if it is not used.

In general, a 3D printing system is a system for creating a desired structure using 3-Dimensional (3D) printing technology, and technology development has been actively made in recent years. That is, since the 3D printing method can be manufactured after lamination by automation or integration, installation work by manpower is excluded, so rapid manufacturing is possible, and manufacturing cost due to labor cost reduction can be reduced.

A brief description of the process of creating a structure by the 3D printing system using the 3D printing method is as follows.

First, the shape data of the structure to be implemented is created, and the structural materials required for the structure are composed and blended, and then filled into the interior of the 3D printing system. The structural material filled as described above is discharged from the nozzle device of the 3D printing system to the external target surface. At this time, the nozzle device of the 3D printing system achieves thickness by stacking structural materials through several passes in the longitudinal direction according to the shape data of the structure. Through this series of processes, the 3D printing system actually implements the structure.

Unlike the conventional 3D printing method in which a product is manufactured by 3D printing a product accessory and then assembling the accessory, the 3D printing method of the structure as described above is made integrally without the assembly process by performing all passes and stacking continuously at once. This must be possible. In other words, 3D printing technology has already been commercialized for small products in the field of machinery and bio, but in the case of structures such as buildings, the scale of the structure is large, so unlike the existing 3D printing technology, it is constructed in an integrated 3D printing method.

For example, in Korean Patent Registration No. 10-1616306 (name of the invention: 3D printing cement product manufacturing apparatus and its manufacturing method, registration date: 2016.04.22), a mixture material for producing a cement mortar is reacted with a rapid setting agent. Disclosed are an apparatus for manufacturing a three-dimensional printed cement product and a method for manufacturing the cement mortar, which can prevent premature hardening of cement mortar by supplying it separately in a state that does not. Korean Patent Registration No. 10-1616306 is a technology related to the construction of cement products with 3D printing technology.

As described above, large-scale structures such as buildings must be formed in a safe structure capable of supporting the scale, and for this purpose, separate requirements for compressive strength in the gravity direction, tensile strength in the longitudinal direction, and adhesion strength between laminated layers are required. It must be more fulfilled. However, since the 3D printing material of structures such as buildings is limited to concrete materials, the compressive strength can also satisfy safety performance if the bonding strength between the laminated layers is secured due to the characteristics of the concrete material that is strong in compressive strength, but reinforcement can be printed. Because there is no, it is difficult to secure tensile strength.

On the other hand, UHPC materials have higher compressive strength and flexural tensile strength than general concrete materials, and in particular, it is possible to further increase flexural tensile strength by applying steel fibers. Accordingly, in recent years, attempts to use UHPC materials for 3D printing construction of large-scale structures such as buildings are increasing.

However, when the UHPC material is made of bibim concrete, it has very high fluidity and a sticky characteristic like a malt because it is similar to mud in a tidal flat containing a lot of water. Therefore, there is a problem in that it is difficult to stably laminate the laminated layer because the laminated layer spreads during 3D printing construction.

In order to solve the problem of high fluidity generated when the UHPC material is laminated as described above, it is also possible to use a quick-setting agent that quickly hardens within 30 seconds to 1 minute to easily express strength in the laminate layer. However, the UHPC material has a dense structure and has excellent high strength, but there is a disadvantage that it is difficult to realize a fundamental decrease in fluidity due to the poor performance of the rapid setting agent because there is insufficient space for the rapid setting agent to penetrate the inside of the tissue. . In addition, even if lamination between lamination layers is possible, since the quick-setting agent exists only on the surface of the lamination layer, there is a disadvantage in that the compressive performance of the structure is deteriorated because the adhesion performance between the lamination layers is deteriorated.

As described above, UHPC material is a high-flow material in which the use of quick-setting agents is not effective, but since it is a material that is very superior in strength than general concrete materials, it is urgent to prepare countermeasures for use in 3D printing construction of structures such as buildings. to be.

An embodiment of the present invention provides a 3D printing nozzle device using a UHPC material capable of integrally constructing a structure such as a building using a UHPC material in a 3D printing method.

In addition, an embodiment of the present invention provides a 3D printing nozzle device using a UHPC material capable of appropriately controlling the curing of the UHPC material by providing heat to the UHPC material and omitting the use of a rapid setting agent.

In addition, an embodiment of the present invention is a 3D printing nozzle using a UHPC material capable of accelerating the falling transfer speed of the UHPC material inside the 3D printing nozzle, as well as reducing the falling vibration caused by the falling of the UHPC material. Provide the device.

According to an embodiment of the present invention, the UHPC material is introduced into and accommodated in the inner space, and the nozzle device main body moves along a path corresponding to the shape data of the structure during 3D printing construction, and in the inner space of the nozzle device main body. A nozzle discharge port for discharging the received UHPC material is formed, and a discharge nozzle provided in a shape converging toward the nozzle discharge port at a lower portion of the nozzle device main body, and the UHPC material disposed on the discharge nozzle and discharged from the nozzle discharge port It provides a 3D printing nozzle apparatus using a UHPC material including a nozzle heater that provides heat to the UHPC material passing through the inner space of the discharge nozzle to accelerate curing.

Preferably, the nozzle heater may be disposed in a shape surrounding the outer circumference of the discharge nozzle so as to uniformly provide heat in the circumferential direction of the discharge nozzle.

Preferably, the discharge nozzle may be formed of a thermally conductive material. The nozzle heater may be provided in a shape to provide heat to the discharge nozzle to transfer heat to the UHPC material through the discharge nozzle.

A heat transfer member for transferring heat from the nozzle heater to the inner space of the discharge nozzle may be provided to protrude in the inner circumferential portion of the discharge nozzle.

The heat transfer member may be formed to protrude from the inner peripheral portion of the discharge nozzle toward the inner space in the shape of any one of a rod, a rod, a wing, or a guide vane.

A plurality of heat transfer members may be spaced apart from each other in at least one of an up-down direction or a circumferential direction in an inner peripheral portion of the discharge nozzle.

Preferably, the nozzle heater may adjust the amount of heat supplied to the UHPC material according to a degree of curing, a discharge speed, and a discharge time of the UHPC material discharged from the discharge nozzle.

On the other hand, the 3D printing nozzle device using the UHPC material according to an embodiment of the present invention, the discharge nozzle and the nozzle device body to block the phenomenon that the heat of the nozzle heater is transferred from the discharge nozzle to the nozzle device body. It may further include an insulated connector disposed between the.

The insulating connector may be attached and detachably connected to an upper portion of the discharge nozzle and a lower portion of the nozzle device body, and may be formed of an insulating material for blocking heat transmitted from the discharge nozzle to the nozzle device body.

The insulating connector may be formed in a ring shape connected to the upper portion of the discharge nozzle and the lower portion of the nozzle device body. An upper portion of the insulating connector may be connected to a lower portion of the main body of the nozzle device by a screw coupling method, and a lower portion of the insulating connector may be connected to an upper portion of the discharge nozzle by a screw coupling method.

Preferably, the nozzle device main body, a nozzle housing having a lower portion connected in communication with the upper portion of the insulating connector and having a material inlet through which the UHPC material is introduced is formed at the upper portion, and a plurality of the nozzle housings are rotatably disposed in the inner space of the nozzle housing, A transfer screw having screw blades for accelerating the falling transfer speed of the UHPC material and reducing the falling vibration of the UHPC material, and a screw driving unit connected to the transfer screws and providing a driving force for rotation of the transfer screws It may include.

The transfer screws may be disposed parallel to each other in the inner space of the nozzle housing, and the screw blades may be disposed in a shape in which the screw blades are alternately overlapped with each other.

The 3D printing nozzle device using the UHPC material according to the embodiment of the present invention has a structure in which a nozzle heater that provides heat to the UHPC material passing through the inner space of the discharge nozzle is disposed on the discharge nozzle. The curing action of the material can be properly controlled, and the spread of the laminated layer due to the high fluidity of the UHPC material can be effectively prevented by rapidly curing the UHPC material discharged from the discharge nozzle during 3D printing construction of the structure.

In addition, the 3D printing nozzle device using the UHPC material according to the embodiment of the present invention has a structure in which the UHPC material is cured using the heat of the nozzle heater, so the use of the rapid setting agent can be fundamentally omitted. When using, it is possible to solve various problems that occur when the quick-setting agent does not penetrate the UHPC material. In particular, in the present embodiment, since it can be implemented by simply changing the structure of adding the nozzle heater to the discharge nozzle, it can be provided with a simpler structure than the configuration required when using the quick-setting agent.

In addition, the 3D printing nozzle device using the UHPC material according to the embodiment of the present invention has a structure in which the heat transfer member protrudes to the inner peripheral portion of the discharge nozzle, so that the heat of the nozzle heater is smoothly transferred to the center of the inner space of the discharge nozzle. It is possible to transfer, thereby quickly and uniformly providing the heat of the nozzle heater to the UHPC material accommodated in the inner space of the discharge nozzle.

In addition, the 3D printing nozzle device using the UHPC material according to the embodiment of the present invention has a structure in which an insulating connector formed of an insulating material is disposed between the main body of the nozzle device and the discharge nozzle, so the heat of the nozzle heater provided to the discharge nozzle is discharged. It is possible to block a phenomenon that is transmitted from the nozzle to the main body of the nozzle device, and thus, the problem in which the UHPC material accommodated in the inner space of the main body of the nozzle device is abnormally cured by the heat of the nozzle heater can be prevented.

In addition, the 3D printing nozzle device using the UHPC material according to the embodiment of the present invention is arranged in a structure in which a plurality of transfer screws are overlapped with each other in the interior of the discharge nozzle body, so that the UHPC from the inside of the discharge nozzle body toward the discharge nozzle It is possible to more significantly accelerate the falling feed rate of the material, and also reduce the dropping vibration caused by the falling of the UHPC material flowing into the discharge nozzle body.

1 is a schematic diagram of a 3D printing nozzle apparatus using a UHPC material according to an embodiment of the present invention.
2 is a view showing a cross-sectional shape of a main part of the 3D printing nozzle device shown in FIG. 1.
3 is a view showing an exploded state of the main body of the nozzle device shown in FIG. 2, the insulation connector, and the discharge nozzle.
4 is a diagram showing a control configuration of the 3D printing nozzle device shown in FIG. 2.
5 is a diagram schematically illustrating a 3D printing nozzle apparatus using UHPC material according to another embodiment of the present invention.
6 is a view showing a cross section taken along the line AA shown in FIG. 1.
7 is a view showing another example of the heat transfer member shown in FIG. 1.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited or limited by the embodiments. The same reference numerals in each drawing indicate the same members.

FIG. 1 is a schematic diagram of a 3D printing nozzle apparatus 100 using a UHPC material C according to an embodiment of the present invention, and FIG. 2 is a diagram illustrating the 3D printing nozzle apparatus 100 shown in FIG. 1. It is a diagram showing the cross-sectional shape of the main part. 3 is a view showing an exploded state of the nozzle device main body 110, the insulation connector 140, and the discharge nozzle 120 shown in FIG. 2, and FIG. 4 is a view of the 3D printing nozzle device 100 shown in FIG. It is a diagram showing the control configuration.

A 3D printing system according to an embodiment of the present invention includes a 3D printing system body and a 3D printing nozzle device 100.

The 3D printing system according to the present embodiment is a device used to integrally construct a large-scale structure such as a building by using a 3D printing method using a UHPC material (C). As described above, the UHPC material (C) used in the 3D printing system is a material having superior compressive strength and tensile strength compared to general concrete materials, so it is possible to improve the structural strength of the integrated structure by 3D printing method. That is, the general concrete material has a compressive strength of 25 MPa and a tensile strength of 3 to 4 MPa, whereas the UHPC material has a compressive strength of 120 MPa or more and a flexural tensile strength of 15 to 20 MPa. In particular, when steel fibers are applied to the UHPC material (C), the flexural tensile strength of the UHPC material (C) can reach 40 MPa.

However, when UHPC material (C) is made of bibeam concrete, it has very high fluidity like mud in a tidal flat containing a lot of water and has a sticky characteristic like a malt. Therefore, there is a problem in that it is difficult to stack the UHPC material (C) because the stacked layer (L) is easily spread out during 3D printing construction. As a method to solve the high fluidity problem of the UHPC material (C) as described above, even if the rapid setting agent is used, the structure of the UHPC material (C) is dense, so that the rapid setting agent does not smoothly penetrate into the tissue of the UHPC material (C). there is a problem. In other words, the UHPC material (C) has excellent strength, but the performance of the quick-setting agent may be lowered due to insufficient space for the rapid-setting agent to penetrate into the tissue, and accordingly, the high fluidity of the UHPC material (C) It cannot be reduced to the desired level. Even if the stacking between the stacked layers (L) of the UHPC material (C) is possible, the adhesion between the stacked layers (L) is not good because the quick-setting agent exists only on the surface of the stacked layer (L), so the compressive performance of the structure may be degraded have.

In order to solve the various problems caused by the use of the UHPC material (C) for the 3D printing construction of the structure as described above, the 3D printing nozzle device 100 of this embodiment provides heat to the UHPC material (C) to provide the UHPC material (C ) Can be formed in a structure that properly controls the curing. Meanwhile, the configuration and operation method of the 3D printing nozzle device 100 using the UHPC material (C) according to the present embodiment will be described in more detail below.

Meanwhile, the main body of the 3D printing system includes a computer simulation device, a mixing device, a transport device, a nozzle moving device, and a control unit 154.

Here, the computer simulation device may create shape data of the structure and transmit it to the control unit. The computer simulation apparatus as described above may derive shape data representing the size, shape, and volume of a structure to be implemented and store it in the control unit 154 in the form of a database.

And the mixing device can make the UHPC material (C) by blending the material which comprises a structure.

In addition, the transport device is a configuration that moves the UHPC material (C) made by the mixing device, and serves as a transport pump that provides a driving force for the pressure feeding of the UHPC material (C), and a moving path for the UHPC material (C). It may include a transport pipe (10). One end of the transport pipe 10 may be connected to the mixing device, and the other end of the transport pipe 10 may be connected to the 3D printing nozzle device 100.

In addition, the nozzle moving device is configured to move the 3D printing nozzle device 100 in a desired direction according to the shape data of the structure. The nozzle moving device may be formed in a genture method or a wire method. However, in the case of a large-scale structure such as a building, a wire type nozzle moving device may be more suitable.

In addition, the control unit 154 is a component that controls the operation of the transport device, the nozzle moving device, and the 3D printing nozzle device according to the shape data of the structure. The control unit 154 controls the operation of the 3D printing nozzle device 100, thereby accurately ejecting the UHPC material (C) onto the target surface to stack the stacked layer, and can stack multiple layers in the longitudinal direction set by the shape data of the structure. The thickness can be achieved by laminating the UHPC material (C) through the pass. Through this series of processes, the 3D printing system can actually implement the target structure as a whole.

Hereinafter, the configuration and operation method of the 3D printing nozzle apparatus 100 using the UHPC material (C) according to the present embodiment will be described in more detail.

1 to 4, a 3D printing nozzle device 100 using a UHPC material (C) according to an embodiment of the present invention includes a nozzle device body 110, a discharge nozzle 120, and a nozzle heater 130. ) And an insulated connector 140.

The 3D printing nozzle apparatus 100 according to the present embodiment may be formed in a structure in which the UHPC material C discharged from the discharge nozzle 120 is cured using heat provided from the nozzle heater 130. That is, the 3D printing nozzle device 100 can cure the UHPC material (C) by the heat of the nozzle heater 130 to alleviate the fluidity of the UHPC material (C), thereby stabilizing the UHPC material (C). By stacking the stacked layer L, spreading of the stacked layer L may also be prevented.

Therefore, in this embodiment, since the 3D printing nozzle device 100 does not need to use the rapid payment agent, the addition of the rapid payment supply structure according to the use of the rapid payment agent, control the supply amount of the rapid payment agent, and the 3D printing nozzle device 100 ), the problem of vibration caused by mixing of the rapid settlement agent can be omitted.

As shown in FIGS. 1 to 3, the main body 110 of the nozzle apparatus according to the present embodiment may be moved along a path corresponding to shape data of the structure during 3D printing construction of the structure. To this end, the nozzle device body 110 may be connected to the nozzle transfer device in a wire manner and disposed in a suspended manner. The other end of the transport pipe 10 may be connected to the nozzle device body 110 as described above in communication. Accordingly, the UHPC material C, which has been pressurized along the transport pipe 10, may be introduced and accommodated in the inner space of the nozzle device body 110.

For example, the nozzle device body 110 may include a nozzle housing 112, transfer screws 114 and 116, and a screw drive unit 118.

The nozzle housing 112 may be connected to the nozzle transfer device in a wire manner, and may be formed in a hollow cylindrical shape so as to accommodate and flow the UHPC material (C). That is, the first internal space S1 may be formed inside the nozzle housing 112. The UHPC material C may be accommodated in the first inner space S1, and may drop and move toward the discharge nozzle 120 along the first inner space S1.

Here, a material inlet 112b into which the UHPC material C is introduced may be formed on the upper portion of the nozzle housing 112, and the other end of the transport pipe 10 may be connected to the material inlet 112b in communication. In addition, the lower portion of the nozzle housing 112 may be connected to and detachably from the upper portion of the insulating connector 140.

A plurality of transfer screws 114 and 116 may be rotatably disposed in the first inner space S1 of the nozzle housing 112. Screw blades 114b and 116b used for the transfer of the UHPC material C may be formed on the transfer screws 114 and 116, respectively. The transfer screws 114 and 116 may be disposed parallel to each other in the first inner space S1 of the nozzle housing 112, and the screw blades 114b and 116b may be disposed in a shape in which they overlap each other. For example, the transfer screws 114 and 116 may be formed in a screw conveyor structure.

Therefore, when the transfer screws 114 and 116 are rotated in the same direction by the screw driving unit 118, the UHPC material is transferred downward toward the discharge nozzle 120 in the first inner space S1 of the nozzle housing 112 It is possible to accelerate the falling feed speed of (C) and reduce the vibration of the falling of the UHPC material (C) due to the drop impact of the UHPC material (C) in the first inner space (S1) of the nozzle housing 112. .

Meanwhile, in the present embodiment, it is described that two transfer screws 114 and 116 are disposed in the first inner space S1 of the nozzle housing 112, but the design of the 3D printing nozzle device 100 is not limited thereto. Three or more transfer screws 114 and 116 may be arranged depending on conditions and circumstances.

For example, a first transfer screw 114 and a second transfer screw 116 may be disposed in the first inner space S1 of the nozzle housing 112.

Here, the first transfer screw 114 is a first screw rotation shaft 114a that is rotatably disposed in a axial shape that is elongated in the vertical direction in the first inner space S1 of the nozzle housing 112, and a first A first screw wing 114b formed in a spiral shape along the periphery of the outer periphery of the screw rotation shaft 114a may be included.

In addition, the second transfer screw 116 is a second screw rotation shaft 116a that is rotatably disposed in a axial shape that is elongated in the vertical direction in the first inner space S1 of the nozzle housing 112, and a second It may include a second screw blade (116b) provided in a spiral shape along the periphery of the outer periphery of the screw rotation shaft (116a).

The first screw rotation shaft 114a and the second screw rotation shaft 116a may be disposed parallel to each other in the first inner space S1 of the nozzle housing 112 and correspond to the circumferential direction of the nozzle housing 112. Can be rotated together in the direction of rotation. Upper ends of the first screw rotation shaft 114a and the second screw rotation shaft 116a as described above may be connected to the screw driving unit 118.

The first screw blade 114b and the second screw blade 116b may be formed in a helical structure in the same direction on the outer peripheries of the first screw rotation shaft 114a and the second screw rotation shaft 116a. The first screw blades 114b and the second screw blades 116b as described above may be disposed to be staggered with each other in the vertical direction and may be disposed to overlap each other. Accordingly, the falling feed rate of the UHPC material (C) can be further increased by the first screw blade (114b) and the second screw blade (116b) rotated together in the same direction, and the UHPC material (C) is used in the nozzle housing ( Since it flows along the first screw blade 114b and the second screw blade 116b in the first inner space S1 of 112), the falling vibration due to the gravity of the UHPC material C may be prevented.

The screw drive unit 118 is a device that provides a driving force for rotation to the first feed screw 114 and the second feed screw 116. The screw driving unit 118 may be connected to upper ends of the first screw rotation shaft 114a and the second screw rotation shaft 116a. The screw driving part 118 as described above may be built in the upper part of the nozzle housing 112.

1 to 3, the discharge nozzle 120 of this embodiment receives the UHPC material C accommodated in the first inner space S1 of the main body 110 of the nozzle device and receives the UHPC at a desired position of the target. It is a configuration in which the material (C) is discharged. A nozzle discharge port 122 for discharging the UHPC material C may be formed under the discharge nozzle 120. The discharge nozzle 120 as described above may be provided in a shape that converges toward the nozzle discharge port 122.

Here, a first internal space S1 of the nozzle housing 112 and a second internal space S2 communicating with the nozzle discharge port 122 may be formed inside the discharge nozzle 120. In the second inner space S2 of the discharge nozzle 120, the UHPC material C introduced from the nozzle housing 112 may be temporarily accommodated, and the temporarily accommodated UHPC material C is the discharge nozzle 120. It may flow to the nozzle discharge port 122 along the inner periphery.

In addition, the discharge nozzle 120 may be formed of a thermally conductive material having excellent heat transfer. Therefore, the heat generated from the nozzle heater 130 can be transferred to the UHPC material C accommodated in the third inner space S3 of the discharge nozzle 120 via the discharge nozzle 120, thereby being discharged. Curing of the UHPC material C passing through the third inner space S3 of the nozzle 120 may be accelerated.

As shown in FIGS. 1 to 3, the nozzle heater 130 of the present embodiment is configured to provide heat to the UHPC material C passing through the third inner space S3 of the discharge nozzle 120. The nozzle heater 130 may be disposed on the outer periphery of the discharge nozzle 120. Accordingly, hardening of the UHPC material C discharged from the nozzle discharge port 122 may be accelerated by the heat provided from the nozzle heater 130, and the strength of the laminated layer L according to the lamination of the UHPC material C Can be rapidly expressed, and the high fluidity of the UHPC material (C) is relaxed, so that the spreading phenomenon of the laminated layer (L) can be prevented in advance.

Here, the nozzle heater 130 may be provided on the outer periphery of the discharge nozzle 120 to transfer heat to the UHPC material C through the discharge nozzle 120. That is, in this embodiment, the nozzle heater 130 is not a structure in which heat is directly provided to the UHPC material (C), and the UHPC material (C) through the discharge nozzle 120 by providing heat to the discharge nozzle 120 It can be provided in a structure that indirectly provides heat to the.

As the nozzle heater 130 as described above, a conventional electric heater may be used. For example, the nozzle heater 130 may be a sheath heater disposed in a shape surrounding the outer periphery of the discharge nozzle 120.

In addition, the nozzle heater 130 may be disposed in a shape surrounding the outer periphery of the discharge nozzle 120. That is, in the present embodiment, the nozzle heater 130 may not be eccentrically disposed only on a part of the outer peripheral portion of the discharge nozzle 120, but may be disposed in a shape surrounding the entire outer peripheral portion of the discharge nozzle 120. Accordingly, the nozzle heater 130 can uniformly provide heat to the outer circumference of the discharge nozzle 120, and the UHPC material C disposed in the third inner space S3 of the discharge nozzle 120 is also discharged. It can be evenly cured in the circumferential direction of 120.

Meanwhile, the nozzle heater 130 may adjust the amount of heat supplied to the UHPC material C according to the degree of curing of the UHPC material C discharged from the discharge nozzle 120, the discharge speed, and the discharge time. That is, if the operation of the nozzle heater 130 is adjusted, the cured state of the UHPC material C discharged from the discharge nozzle 120 can be appropriately controlled. The degree of curing of the UHPC material (C) as described above, and the discharging speed and discharging time of the UHPC material (C) may be measured using a separate measuring tool or a measuring sensor, or the 3D printing nozzle device 100 and the UHPC material (C) ) Can be calculated using design data, or roughly inferred based on the experience of the measurer.

As shown in FIGS. 1 to 3, the insulating connector 140 of this embodiment is configured to block the transfer of heat provided from the nozzle heater 130 from the discharge nozzle 120 to the nozzle device main body 110. To this end, the insulating connector 140 may be formed of an insulating material for blocking heat transmitted from the discharge nozzle 120 to the nozzle device body 110. The vertical length of the insulating connector 140 as described above may be appropriately set according to the heat transfer condition between the discharge nozzle 120 and the nozzle device body 110. Therefore, in this embodiment, the phenomenon that the UHPC material C disposed in the first internal space S1 of the nozzle device body 110 by the insulating connector 140 is cured by the heat of the nozzle heater 130 Can be prevented.

Here, the insulating connector 140 may be disposed in a socket shape between the discharge nozzle 120 and the main body 110 of the nozzle device. The insulating connector 140 as described above may be connected to be in communication with the upper portion of the discharge nozzle 120 and the lower portion of the nozzle device body 110 in a removable shape. As an example, the upper portion of the insulating connector 140 may be connected to the lower portion of the nozzle housing 112 of the nozzle device body 110 by a screw coupling method, the lower portion of the insulating connector 140 is the upper portion of the discharge nozzle 120 It can be connected by screwing.

In addition, the insulating connector 140 may be formed in a ring shape connected to the upper portion of the discharge nozzle 120 and the lower portion of the nozzle device body 110 in communication. In this case, a second internal space S2 for passing the UHPC material C may be formed inside the insulating connector 140. The second inner space S2 of the insulating connector 140 as described above includes the first inner space S1 of the nozzle housing 112 of the nozzle device body 110 and the third inner space of the discharge nozzle 120 ( It can be connected in communication with S3).

2 and 3, a housing male screw part 112a may be formed on an outer circumferential portion of the lower portion of the nozzle housing 112, and a housing male screw portion 112a is formed on an inner circumferential portion of the upper portion of the insulating connector 140. A housing female screw portion 144 to be screwed with may be formed. In addition, a nozzle male screw portion 120a may be formed at an outer peripheral portion of the upper portion of the discharge nozzle 120, and a nozzle female screw portion for screwing with the nozzle male screw portion 120a may be formed at an inner peripheral portion of the lower portion of the insulating connector 140 ( 146) can be formed.

A positioning unit 142 in which the lower portion of the nozzle housing 112 and the upper portion of the discharge nozzle 120 are engaged may be formed on the inner peripheral portion of the insulating connector 140 as described above. The positioning unit 142 may serve as a stopper for setting a fastening position of the nozzle housing 112 and the insulating connector 140 and a fastening position of the discharge nozzle 120 and the insulating connector 140. The positioning unit 142 may protrude to a predetermined height along the circumference of the inner circumference of the insulating connector 140.

The operation and effect of the 3D printing nozzle device 100 using the UHPC material (C) according to an embodiment of the present invention configured as described above will be described as follows.

4 schematically shows a control configuration of the 3D printing nozzle device 100. That is, the control unit 154 can control the operation of the screw drive unit 118 and the nozzle heater 130, and the electricity supply unit 150 is electrically connected to the control unit 154, the screw drive unit 118, and the nozzle heater 130. Can supply. In addition, the temperature sensor 132 may measure heat generated from the nozzle heater 130 and transmit it to the controller 154. In addition, the information input unit 152 may input measured values for the degree of curing, the discharging speed, and discharging time of the UHPC material C to be transmitted to the control unit 154.

Referring to FIGS. 1 to 4, when the 3D printing system is operated, the electricity supply unit 150 supplies electricity to the control unit 154, the screw driving unit 118, and the nozzle heater 130. In this case, the screw driving unit 118 rotates the first transfer screw 114 and the second transfer screw 116 in the same direction, and the nozzle heater 130 provides a set amount of heat to the discharge nozzle 120.

The control unit 154 measures the amount of heat supplied from the nozzle heater 130 to the discharge nozzle 120 through the temperature sensor 132 in real time.

In the above-described state, the UHPC material C is supplied to the upper portion of the first inner space S1 among the nozzle housing 112 of the nozzle device body 110 through the other end of the transport pipe 10.

The UHPC material (C) introduced into the upper portion of the first internal space (S1) is the weight of the UHPC material (C), the pressure of the transport pipe (10), or the first and second transfer screws (114, 116). It flows to the lower portion of the first internal space S1 due to a conveying force or the like.

Therefore, the UHPC material (C) is transported downward from the first inner space (S1) of the nozzle housing 112 toward the discharge nozzle 120, but to the first transport screw 114 and the second transport screw 116. As a result, the falling feed rate of the UHPC material (C) is stably increased. In addition, the UHPC material (C) is not a structure that freely falls from the top to the bottom of the first inner space (S1) of the nozzle housing (112), the first screw blade (114b) of the first transfer screw (114) Since the structure is conveyed along the second screw blades 116b of the and the second conveying screw 116, the dropping vibration of the UHPC material C due to the drop impact of the UHPC material C is also reduced.

As described above, the UHPC material C flowing downward along the first inner space S1 of the nozzle housing 112 passes through the second inner space S2 of the insulated connector 140 to the discharge nozzle 120. It flows to the third inner space S3.

At this time, the UHPC material C introduced into the third internal space of the discharge nozzle 120 receives heat provided from the nozzle heater 130 through the discharge nozzle 120. At this time, the UHPC material (C) is cured by the heat of the nozzle heater (130), so that the fluidity of the UHPC material (C) can be appropriately relaxed.

The UHPC material (C) properly cured as described above flows downward from the third inner space (S3) of the discharge nozzle 120 toward the nozzle discharge port 122, and is discharged to the outside through the nozzle discharge port 122 Is formed as a stacked layer L corresponding to the shape data of the structure.

Therefore, since the fluidity of the UHPC material (C) is adequately relaxed, spreading of the layered layer (L) can be prevented, and the strength of the layered layer (L) is improved due to the hardening of the UHPC material (C). I can make it.

On the other hand, the control unit 154 receives the curing degree, discharge speed, and discharge time of the UHPC material C discharged from the discharge nozzle 120 through the information input unit 152 to appropriately adjust the heat supply amount of the nozzle heater 130. Control.

That is, when it is determined that the curing of the UHPC material C has not reached the set level, the control unit 154 increases the amount of heat supplied from the nozzle heater 130. On the other hand, when it is determined that the curing of the UHPC material (C) has progressed beyond the set level, the control unit 154 reduces the amount of heat supplied from the nozzle heater 130. Of course, it is also possible to appropriately adjust the time during which the heat of the nozzle heater 130 is transferred to the UHPC material C by appropriately adjusting the discharge speed and the discharge time of the UHPC material C.

As described above, the 3D printing nozzle device 100 according to the present embodiment discharges the UHPC material C in a state in which it has been properly cured to form the laminated layer L along the path derived by the shape data of the structure. It can be repeatedly laminated, and by performing this repeatedly, a large-scale structure such as a building can be constructed by 3D printing using a UHPC material (C) having a higher strength than a general concrete material.

5 is a view schematically showing a 3D printing nozzle device 200 using a UHPC material (C) according to another embodiment of the present invention, and FIG. 6 is a view showing a cross section taken along line AA shown in FIG. 1 7 is a view showing another example of the heat transfer member 222 shown in FIG.

In FIGS. 5 to 7, the same reference numerals as those shown in FIGS. 1 to 4 denote the same members, and detailed descriptions thereof will be omitted. Hereinafter, different points from the 3D printing nozzle device 100 shown in FIGS. 1 to 4 will be described.

5 to 7, a 3D printing nozzle device 200 using a UHPC material (C) according to another embodiment of the present invention includes the 3D printing nozzle device 100 shown in FIGS. 1 to 4 The difference is that a heat transfer member 222 for transferring heat from the nozzle heater 130 is provided on the inner periphery of the discharge nozzle 220.

That is, the heat transfer member 222 according to the present embodiment is a configuration for transferring heat from the nozzle heater 130 to the third inner space S3 of the discharge nozzle 220. Therefore, the heat transfer member 222 may be formed of a material having excellent thermal conductivity. The heat transfer member 222 as described above may be disposed in a protruding shape on the inner periphery of the discharge nozzle 220.

For example, the heat transfer member 222 may be formed in the shape of any one of a rod, a rod, a wing, or a guide vane, and the third inner space (S3) in the inner peripheral portion of the discharge nozzle 220 ) It can protrude long toward the center of the. On the other hand, in this embodiment, the heat transfer member 222 is formed in a shape protruding in the horizontal direction from the inner periphery of the discharge nozzle 220, but the discharge nozzle 220 according to the design conditions and circumstances of the 3D printing nozzle device 200 It may be formed in a shape protruding in an oblique direction from the inner peripheral portion of the. In particular, when the heat transfer member 222 protrudes in a downwardly inclined shape from the inner circumference of the discharge nozzle 220, the interference resistance with the UHPC material (C) can be further reduced, and the UHPC material (C) is placed in a third inner space. It can also serve to guide to the center of (S3).

5 and 6, in the present embodiment, the heat transfer member 222 may be formed in a rod shape having a circular cross section, but is not limited thereto and does not interfere with the flow of the UHPC material (C). Any shape that can deliver

Here, one end of the heat transfer member 222 may be disposed in the shape of a cantilevered support beam in the center of the third inner space S3, but is not limited thereto, and has a structure that approaches or contacts the inner circumference of the discharge nozzle 220. It can also be formed long.

Further, the other end of the heat transfer member 222 may be formed in a structure connected to the inner peripheral surface of the discharge nozzle 220. Unlike the above, the heat transfer member 222 may be disposed to pass through the discharge nozzle 220 and may be formed in a structure directly connected to the nozzle heater 130. When the other end of the heat transfer member 222 is directly connected to the nozzle heater 130 as described above, the heat of the nozzle heater 130 can be more smoothly transferred to the heat transfer member 222, but instead of the nozzle heater ( In 130), the sealing performance of the portion through which the other end of the heat transfer member 222 passes must be sufficiently secured.

Meanwhile, a plurality of heat transfer members 222 according to the present embodiment may be spaced apart from each other in at least one of an up-down direction or a circumferential direction in the inner circumferential portion of the discharge nozzle 220.

5 and 6 show radial heat transfer members 222 provided to be spaced apart in the vertical direction on the inner circumference of the discharge nozzle 220, and in FIG. 7, the inner circumferential portion of the discharge nozzle 320 is vertically separated from each other. A plurality of heat transfer members 322, 324, 326 and 326 provided alternately are shown.

As shown in FIGS. 5 and 6, the plurality of heat transfer members 222 may be disposed in a radial shape along the circumferential direction of the inner circumferential portion of the discharge nozzle 220. The heat transfer members 222 arranged in a radial shape as described above are respectively disposed at a plurality of positions spaced apart in the vertical direction on the inner circumference of the discharge nozzle 220, or disposed only at a specific position of the inner circumference of the discharge nozzle 220 Can be.

Hereinafter, in the present embodiment, it will be described that the radial heat transfer member 222 is disposed above and below the inner peripheral portion of the discharge nozzle 220, respectively. That is, the heat transfer member 222 has a plurality of first heat transfer members 224 disposed radially above the inner circumferential portion of the discharge nozzle 220, and radially below the inner circumferential portion of the discharge nozzle 220. It may include a plurality of disposed second heat transfer members 226. At this time, the first heat transfer members 224 and the second heat transfer members 226 may be staggered with each other at a predetermined angle in the circumferential direction of the inner circumferential portion of the discharge nozzle 220, and the third It may be formed to protrude to different lengths according to a change in the size of the inner space S3.

As shown in FIG. 7, the plurality of heat transfer members 322, 324, 326, and 326 may be disposed in a shape to be staggered from each other along the vertical direction on the inner periphery of the discharge nozzle 320. That is, the first heat transfer member 322 may be eccentrically disposed at the first point at the highest position of the inner peripheral portion of the discharge nozzle 320, and the second heat transfer member 324 is more than the first heat transfer member 322 The third heat transfer member 326 may be eccentrically disposed at a second point different from the first point at a lower position, and the third heat transfer member 326 may be eccentrically disposed at the first point at a lower position than the second heat transfer member 324, and the first 4 The heat transfer member 328 may be eccentrically disposed at the second point at a lower position than the third heat transfer member 326.

As described above, in the embodiments of the present invention, specific matters such as specific components, etc., and limited embodiments and drawings have been described, but this is only provided to help a more general understanding of the present invention, and the present invention is limited to the above embodiments. It is not, and a person of ordinary skill in the field to which the present invention belongs can make various modifications and variations from this description. Accordingly, the spirit of the present invention is limited to the described embodiments and should not be defined, and all things equivalent or equivalent to the claims as well as the claims to be described later belong to the scope of the inventive concept.

10: transport pipe
100, 200: 3D printing nozzle device
110: nozzle device body
112: nozzle housing
114, 116: feed screw
118: screw drive
120, 220, 320: discharge nozzle
130: nozzle heater
140: insulated connector
C: UHPC material
S1: the first internal space of the main body of the nozzle device
S2: the second inner space of the insulated connector
S3: the third internal space of the discharge nozzle

Claims (10)

A nozzle device main body in which the UHPC material is introduced and accommodated in the inner space, and moves along a path corresponding to the shape data of the structure during 3D printing construction of the structure; A discharge nozzle having a nozzle discharge port for discharging the UHPC material accommodated in the inner space of the nozzle device main body and converging toward the nozzle discharge port at a lower portion of the nozzle device main body; And a nozzle heater disposed on the discharge nozzle and providing heat to the UHPC material passing through the inner space of the discharge nozzle to accelerate curing of the UHPC material discharged from the nozzle discharge port. And an insulating connector disposed between the discharge nozzle and the nozzle device body to block a phenomenon in which heat of the nozzle heater is transferred from the discharge nozzle to the nozzle device body, and
The main body of the nozzle device may include a nozzle housing having a lower portion connected to the upper portion of the insulating connector and having a material inlet through which the UHPC material is introduced; A transfer screw having a plurality of rotatably disposed in the inner space of the nozzle housing and having screw blades for accelerating the falling transfer speed of the UHPC material and reducing the falling vibration of the UHPC material; And a screw driving unit connected to the transfer screws and providing a driving force for rotation of the transfer screws.
The transfer screws are disposed parallel to each other in the inner space of the nozzle housing, and the screw blades are disposed in a shape in which the screw blades overlap each other,
In the inner circumferential portion of the discharge nozzle, a heat transfer member for transferring heat from the nozzle heater to the inner space of the discharge nozzle is provided to protrude,
The heat transfer member is formed to protrude from the inner peripheral portion of the discharge nozzle toward the inner space in the shape of any one of a rod, a rod, a wing, or a guide vane,
The heat transfer member is connected to a position corresponding to the nozzle heater of the inner peripheral surface of the discharge nozzle, or penetrates to a position corresponding to the nozzle heater among the discharge nozzles and is directly connected to the nozzle heater. 3D printing nozzle device using UHPC material.
The method of claim 1,
The nozzle heater is a 3D printing nozzle device using a UHPC material, which is disposed in a shape surrounding the outer circumference of the discharge nozzle so as to uniformly provide heat in the circumferential direction of the discharge nozzle.
The method of claim 1,
The discharge nozzle is formed of a thermally conductive material,
The nozzle heater is a 3D printing nozzle device using a UHPC material, characterized in that provided in a shape to provide heat to the discharge nozzle to transfer heat to the UHPC material via the discharge nozzle or the heat transfer member.
delete delete The method of claim 1,
A 3D printing nozzle device using a UHPC material, wherein a plurality of the heat transfer members are disposed to be spaced apart from each other in at least one of an up-down direction or a circumferential direction on an inner peripheral portion of the discharge nozzle.
The method of claim 1,
The nozzle heater controls the amount of heat supplied to the UHPC material according to a degree of curing, a discharge speed, and a discharge time of the UHPC material discharged from the discharge nozzle.3D printing nozzle device using a UHPC material.
The method of claim 1,
Insulation connector disposed between the discharge nozzle and the nozzle device body to block a phenomenon that the heat of the nozzle heater is transferred from the discharge nozzle to the nozzle device main body;
The insulating connector, UHPC, characterized in that it is detachably connected to the upper portion of the discharge nozzle and the lower portion of the main body of the nozzle device, and formed of an insulating material for blocking heat transmitted from the discharge nozzle to the main body of the nozzle device. 3D printing nozzle device using materials.
The method of claim 8,
The insulating connector is formed in a ring shape connected in communication with the upper portion of the discharge nozzle and the lower portion of the nozzle device body,
A 3D printing nozzle using UHPC material, characterized in that the upper part of the insulating connector is connected to the lower part of the nozzle device by a screw connection method, and the lower part of the insulating connector is connected to the upper part of the discharge nozzle by a screw connection method. Device.
delete

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