KR102528479B1 - Screw type 3d printer extrusion device and operating method thereof - Google Patents

Abstract

The present disclosure relates to a screw type 3D printer extrusion device and an operation method thereof. The screw type 3D printer extrusion device according to an embodiment may comprise: a driving unit providing driving force to rotate a screw in the 3D printer extrusion device; a material supply unit obtaining a pellet type material from an external device connected to the 3D printer extrusion device, crushing the obtained pellet type material into a predetermined size, and providing the pellet type material crushed into a predetermined size; a transfer unit transferring a molded product produced by compressing and melting the pellet type material provided from the material supply unit; and a discharge unit discharging a predetermined amount of the molded product based on fluid pressure according to movement of the produced molded product and elastic force of an internal elastic body having an elastic coefficient in a range corresponding to the fluid pressure. Accordingly, the discharge of the molded product can be precisely controlled.

Description

Screw-type 3D printer extrusion device and its operating method {SCREW TYPE 3D PRINTER EXTRUSION DEVICE AND OPERATING METHOD THEREOF}

The present disclosure relates to a 3D printer extrusion device and an operating method thereof. More specifically, it relates to a screw-type 3D printer extrusion device and an operating method thereof.

3D printing technology is a technology that prints a target work whether it is printed in a 3D space based on a 3D three-dimensional drawing. In general, a 3D printer implements a 3D shape by sequentially stacking several layers, and a 3D target workpiece may be formed based on modeling data for designing a desired shape.

In order to accurately form a target workpiece according to the desired shape, technology for outputting a molded product at a pre-designed position and technology for outputting an accurate amount of molded product according to control are required, but the existing 3D printer extrusion technology is still The cost of the silver material is high, the output speed is low, and the accuracy of the molded product output is limited.

Therefore, there is a need to develop a 3D printer extrusion technology for effectively manufacturing a target shape at low cost and high speed.

Korea Patent No. 2167881

According to one embodiment, a screw-type 3D printer extrusion device and an operating method thereof may be provided.

More specifically, a screw type 3D printer extrusion device including a pellet crushing module and an automatic valve module and an operating method thereof may be provided.

As a technical means for achieving the above-described technical problem, a screw-type 3D printer extrusion device according to an embodiment includes a driving unit for providing a driving force for rotating a screw in the 3D printer extrusion device; A material supply unit for acquiring a pellet type material from an external device connected to the 3D printer extrusion device, pulverizing the obtained pellet type material into a predetermined size, and providing the pellet type material pulverized to the predetermined size; a transfer unit for transporting a molded product produced by compressing and melting the pellet-type material provided from the material supply unit; and a discharge unit for discharging a predetermined amount of molded material based on fluid pressure according to movement of the generated molded object and elastic force of an internal elastic body having an elastic modulus within a range corresponding to the fluid pressure. can include

As a technical means for achieving the above-described technical problem, a 3D printer extrusion device according to another embodiment includes a network interface, a memory for storing one or more instructions, and the one or more instructions in addition to a drive unit, a material supply unit, a transfer unit, and a discharge unit. It may include at least one processor that executes.

As a technical means for achieving the above-described technical problem, according to another embodiment, a method of operating a 3D printer extrusion device may be provided.

In addition, as a technical means for achieving the above-described technical problem, according to another embodiment, a computer-readable recording medium in which a program for performing a method of operating a 3D printer extrusion device may be provided.

According to one embodiment, it is possible to precisely control the discharge of the molding by uniformly pulverizing the pellets.

In addition, according to one embodiment, it is possible to create a high-precision target workpiece by effectively controlling the ejection of a molded object produced based on a pellet-type material.

1 is a view for schematically explaining an operation process of a screw type 3D printer extrusion device according to an embodiment.
Figure 2 is a block diagram of a screw-type 3D printer extrusion device according to an embodiment.
Figure 3 is a view for explaining the structure of the material supply unit of the screw-type 3D printer extrusion device according to an embodiment.
4 is a view for explaining in detail the structure of a material supply unit including a pellet grinding module according to an embodiment.
5 is a view for explaining the structure of a 3D printer extrusion device according to an embodiment.
6 is a block diagram of a discharge unit, an automatic valve module, and a nozzle according to an exemplary embodiment.
7 is a diagram for explaining a structure of a discharge unit according to an exemplary embodiment.
8 is a diagram for explaining the structure of an automatic valve module according to an embodiment.
9 is a diagram for explaining in detail the operation and structure of an automatic valve module according to an embodiment.
10 is a diagram for explaining the structure of a nozzle according to an embodiment.
11 is a block diagram of a control unit in a 3D printer extrusion device according to an embodiment.

Terms used in this specification will be briefly described, and the present disclosure will be described in detail.

The terms used in the present disclosure have been selected from general terms that are currently widely used as much as possible while considering the functions in the present disclosure, but they may vary according to the intention or precedent of a person skilled in the art, the emergence of new technologies, and the like. In addition, in a specific case, there is also a term arbitrarily selected by the applicant, and in this case, the meaning will be described in detail in the description of the invention. Therefore, terms used in the present disclosure should be defined based on the meaning of the term and the general content of the present disclosure, not simply the name of the term.

When it is said that a certain part "includes" a certain component throughout the specification, it means that it may further include other components without excluding other components unless otherwise stated. In addition, terms such as "...unit" and "module" described in the specification mean a unit that processes at least one function or operation, which may be implemented as hardware or software or a combination of hardware and software. .

Hereinafter, with reference to the accompanying drawings, embodiments of the present disclosure will be described in detail so that those skilled in the art can easily carry out the present disclosure. However, the present disclosure may be implemented in many different forms and is not limited to the embodiments described herein. And in order to clearly describe the present disclosure in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

1 is a view for schematically explaining an operation process of a screw type 3D printer extrusion device according to an embodiment.

`According to one embodiment, the screw type 3D printer extrusion device 1000 (hereinafter referred to as 'extrusion device' or 3D printer extrusion device) obtains a pellet type material and uses the obtained pellet type material to obtain a predetermined Moldings can be printed. The extrusion device 1000 may transfer a pellet-type material in a screw manner and output a predetermined molded product by compressing and melting the transferred pellet-type material. The 3D printer extrusion device 1000 according to the present disclosure may correspond to a 3D printer device that performs at least one of lamination and cutting for a desired three-dimensional shape.

According to one embodiment, the extrusion device 1000 includes an extruder hopper 122, a motor 124, a reducer 126, a material detection sensor 128, a coupling 130, a screw 132, a pellet grinding module ( 134), a supply part heater 136, a compression part heater 138, a metering part heater 140, an automatic valve module 142, and a nozzle 144. However, it is not limited to the above-described example, and the extrusion device 1000 may further include a material supply device 120 providing a pellet-type material pretreated by the extrusion device 1000 from the outside.

For example, the external material supply device 120 is detachably connected to the material supply unit of the extrusion device 1000, stores the pellet type material, pre-processes the stored pellet type material, and receives the received material from the material supply unit. A predetermined amount of pre-treated pellet type material may be provided to the material supply unit based on the material detection value.

According to one embodiment, the material supply device 120 includes a supply hopper 102, a pellet storage unit 104, a material detection sensor 106, a metering device 108, an air heating device 110 and a pellet high pressure transfer device ( 112) may be included. For example, the material supply device 120 may provide a pellet type material used for printing to the extrusion device 1000 . The supply hopper 102 may store a predetermined amount of pellet type material. The supply hopper 102 may dry the pellet-type material by injecting air heated to a preset temperature by the air heating device 110 into the inside. In addition, the material detection sensor 106 may obtain a sensing value for the remaining amount of the pellet type material stored in the supply hopper 102 . The metering device 108 measures a specified amount of pellet-type material using a small screw device and a load cell, and injects the measured pellet-type material into the pellet high-pressure transfer device.

According to one embodiment, the material supply device 120 may detect whether or not the material in the extruder hopper 122 is insufficient based on a sensing value obtained from the material detection sensor 128 attached to the extruder hopper 122 . If the material supply device 120 is identified as insufficient in the remaining amount of pellet-type material stored inside the extruder hopper 122, the pellet-type material measured inside the pellet high-pressure transfer device is transferred to the extruder hopper by using high-pressure air (AIR). can be transferred to The extruder hopper 122 stores the pellets transported from the material supply device, and at this time, high-pressure air may be discharged to the outside through a fine mesh. When the material detection sensor 128 attached to the extruder hopper 122 detects a pellet-type material, the material supply sequence may be stopped. The pellet type material stored in the extruder hopper 122 may be supplied to the inside through the movement of the screw 132 inside the transfer unit, and may be transferred in the direction of the nozzle by the rotational operation of the screw.

A pellet crushing module 134 may be fastened to the extruder hopper 122, and when the screw 132 rotates, a pellet-type material may be crushed to a size within a certain range. The pellet type material pulverized to a certain size range through the pellet pulverization module 134 may be transferred to the nozzle through the screw. The extrusion device 1000 may include a discharge unit, and the discharge unit may include an automatic valve module 142 and a nozzle 144 . The automatic valve module 142 installed in the discharge unit can open and close the inlet of the nozzle based on the fluid pressure and the elastic force of the elastic body according to the movement of the molding.

Specifically, the resin (e.g. molding) transferred through the screw applies pressure to a partial area of the needle block of the automatic valve module, and the nozzle is opened while the elastic spring is compressed by the upward movement of the needle block, and the melted The molding may begin to eject. However, when the number of rotations of the screw decreases or the operation of the screw stops, the pressure of the fluid applied to the needle block by the molding may decrease, and the nozzle may be closed while the needle block moves downward due to elastic force. A specific operation of the automatic valve block will be described in detail with reference to FIGS. 7 to 9 .

Figure 2 is a block diagram of a screw-type 3D printer extrusion device according to an embodiment.

According to one embodiment, the screw type 3D printer extrusion device 200 may include a driving unit 240, a material supply unit 260, a transfer unit 280, and a discharge unit 290. However, it is not limited to the above example, and the screw type 3D printer extrusion device 200 may be provided with fewer components or may include more components, of course. According to one embodiment, the screw type 3D printer extrusion device 200 may further include a material supply device connected from the outside.

According to one embodiment, the driving unit 240 may provide a driving force for rotating a screw in the 3D printer extrusion device. According to one embodiment, the driving unit 240 includes a motor generating driving force, a screw and a coupling for fastening the motor, a reducer and a coupling for transmitting a predetermined rotational output torque to the screw according to the output rotational speed of the motor. A bearing may be included to provide mechanical flexibility between the screw fastened through and the motor.

According to one embodiment, the material supply unit 260 obtains a pellet-type material from an external device (eg, an external material supply unit) connected to the 3D printer extrusion device 200, and converts the obtained pellet-type material into a predetermined size. Crushing, it is possible to provide a pellet-type material pulverized to a predetermined size to the transfer unit. According to one embodiment, the material supply unit 260 may include an extruder hopper and a pellet grinding module. The material supply unit 260 may pre-process the pellet-type material provided from the external device, and perform supply and crushing functions for supplying the material to the pre-treated 3D printer extrusion device.

The transfer unit 280 may transfer a molded product produced by compressing and melting the pellet type material provided from the material supply unit 260 . According to one embodiment, the conveying unit 280 includes a screw and a screw therein, which rotate along a predetermined screw axis, transport the pellet-type material, and generate a molded product produced by compressing and melting the transferred pellet-type material. And, one end is formed on the outside of the barrel, a heater that provides heat for melting the pellet-type material to the screw in the barrel, and a barrel that provides a space for the screw to rotate, and cools some areas of the screw. It may include a cooling unit for

In addition, according to one embodiment, the screw may be divided into a supply area in which the pellet-type material is transferred, a compression area in which the transferred pellet-type material is compressed, and a metering area in which the compressed pellet-type material is melted and discharged. . In addition, according to one embodiment, the screw passes through the crushing module while rotating in the internal space provided through the barrel, and may be connected to the motor of the driving unit through a coupling at one end and connected to a nozzle at the other end.

The discharge unit 290 may discharge a predetermined amount of the molded product based on the elastic force of the internal elastic body having an elastic modulus in a range corresponding to the fluid pressure and the yut pressure according to the movement of the molded object transferred from the transfer unit. For example, the discharge unit 290 may include an automatic valve module and a nozzle, and by using an automatic valve module provided with a needle block that slides up and down based on fluid pressure and elastic force, without leakage of the molded material, accurate A positive amount of resin can be output to the outside.

Figure 3 is a view for explaining the structure of the material supply unit of the screw-type 3D printer extrusion device according to an embodiment.

Referring to figures 310 and 320 shown in FIG. 3 , there is illustrated a material feed section shown in extrusion apparatus 1000 . According to one embodiment, the material supply unit 300 may include an extruder hopper 330 and a pellet grinding module 340. According to one embodiment, the extruder hopper 330 stores the pellet-type material provided from the external material supply device, senses the amount of the stored pellet-type material, and the pellet-type material by a predetermined amount according to the movement of the screw. can be fed into pellet milling modules and screws. According to another embodiment, a material detection sensor may be attached to the extruder hopper 330, and the sensing value according to the amount of pellet-type material stored in the extruder hopper 330 is connected to an external material supply device or a screw-type 3D printer extrusion device. It can be transmitted to an external device.

In addition, according to one embodiment, the pellet grinding module 340 is connected to one end of the extruder hopper and uses a plurality of grinding blades formed in a direction corresponding to the rotational direction of the screw to grind the pellet type material provided in the extruder hopper. , It can be pulverized to a size within a predetermined range. For example, the pellet crushing module 340 is fixedly fastened to one end of the extruder hopper, and crushes the pellet-type material to a size within a predetermined range with rotation of the screw using a crushing tube in which a plurality of crushing blades are formed. can

According to one embodiment, the pellet grinding module 340 includes a fastening part for connecting the pellet grinding module to one end of the extruder hopper, and an inner space for including a screw, and is formed in the inner space in a direction opposite to the rotation direction of the screw. It may include a grinding unit including a plurality of grinding blades to be. In addition, according to one embodiment, the grinding unit has an outer circumferential surface on which a predetermined fixing portion for preventing rotation of the pellet grinding module is formed on at least a portion of the grinding unit, and an inner circumferential surface including a plurality of grinding blades formed in a direction opposite to the rotational direction of the screw. It may include a crushing tube provided. The structure and operation of the crushing unit or the crushing pipe will be described in detail with reference to FIG. 4 to be described later.

4 is a view for explaining in detail the structure of a material supply unit including a pellet grinding module according to an embodiment.

Referring to figure 470 of FIG. 4 , various embodiments of a grinding unit are shown. For example, the crushing unit may include a plurality of grinding blades formed on the inner circumferential surface (434, 442) in a direction opposite to the rotational direction of the screw, and the outer circumferential surface on which a predetermined fixing portion is formed to prevent rotation of the pellet grinding module. (432, 444). According to one embodiment, the crushing unit may be provided in a tubular crushing tube. According to one embodiment, the grinding unit may be attached to and detached from the hopper block of the extruder through a connecting mechanism such as a keyway or a bolt.

In addition, according to one embodiment, the crushing unit may be provided in a polygonal shape such as a circular, square, or hexagonal tube. In addition, according to one embodiment, the plurality of grinding blades in the grinding tube may be provided in a straight line from the inner circumferential surface or tapered. Specifically, the cross section of each of the plurality of grinding blades in the grinding unit is connected to the end point of the grinding blade formed closest to the screw in the grinding tube and the two points formed on the inner circumferential surface (432, 442) of the grinding tube from the end point. It may be provided in a triangular shape including a line segment of. In addition, according to an embodiment, among the two segments formed from the end points of each of the grinding blades, the length of the segment located in the direction opposite to the direction in which the screw rotates may be longer than the length of the other segment. . Hereinafter, the structure of the extruder hopper in the extrusion device 1000, the pellet grinding module, and the structure of the screw in the conveying unit and the associated material supply unit will be described in detail.

As shown in diagram 460, according to one embodiment, the pellet grinding module is connected to the extruder hopper 402 and can be inserted into the housing block 413 and the top of the barrel 422 of the transfer unit. While the pellet grinding module is inserted into the housing block 413, a space for the screw 412 to rotate may be provided therein. The pellet grinding module 410 can be prevented from rotating by being fixed in the housing block 413 through a fixing part while the screw 412 is rotating. According to one embodiment, the fixing part may be provided in the form of at least one of a keyway, a bolt, a D-CUT, a headless bolt, and an angled groove.

A plurality of grinding blades of the pellet grinding module 410 may be formed at predetermined intervals along the inner circumferential surface 418 of the inner space in the grinding unit, and according to one embodiment, a plurality of grinding blades formed opposite to the direction of rotation of the screw. It may extend from the inner circumferential surface with this predetermined inclination. The pellet type material supplied from the extruder hopper can move to the nozzle by the rotation of the screw 412, and the space area 414 divided by the grinding blades of the pellet crushing module 410 and the rotating blades 417 of the screw can be transferred to the nozzle through A plurality of grinding blades in the pellet grinding module 410 may be provided in different structures for each type and type of material of the pellet type. According to one embodiment, the pellet grinding module may include multiple types of hybrid grinding blades.

5 is a view for explaining the structure of a 3D printer extrusion device according to an embodiment.

According to one embodiment, the 3D printer extrusion device 500 includes a screw 502, a hopper block 504, an extruder hopper 506, an extruder cover 508, a barrel 510, a cooling block 522, a heater 532 , 534 and 536), temperature sensors 542, 544 and 546, and a discharge unit 560. However, it is not limited to the above example, and the 3D printer extrusion device 500 may include more components or may be provided with fewer components. According to one embodiment, the extruder hopper and the pellet grinding module of the material supply unit may be located at the upper end of the barrel 510 of the transfer unit, and may be fixed to the hopper block 504. In addition, according to one embodiment, the cooling block 522 is additionally fastened to at least a part of the hopper block 504, so that the pellet type material may be cooled.

According to one embodiment, the transfer unit is located outside the screw 502 for transporting the molding produced by compressing and melting the pellet-type material, the barrel 510 for providing a rotational space for the screw, and the outside of the barrel, so that the pellet-type material It may include heaters 532, 534, and 536 that provide heat for melting to the screw in the barrel. However, according to another embodiment, the transfer unit may further include a plurality of temperature sensors 542 544 and 546 positioned between the heaters to measure the temperature of the pellet-type material in the screw. In addition, according to one embodiment, the above-described components may be located inside the extruder cover 508 or the housing block. According to one embodiment, the discharge unit 560 is located at the lower end of the transfer unit and includes an automatic valve module for controlling the discharge of the molded material provided in the transfer unit and a nozzle through which a predetermined amount of the molded material is discharged by the control of the automatic valve module. can

6 is a block diagram of a discharge unit, an automatic valve module, and a nozzle according to an exemplary embodiment.

7 is a diagram for explaining a structure of a discharge unit according to an exemplary embodiment.

The structures of the discharge unit, the automatic valve module and the nozzle will be described in detail with reference to FIGS. 6 and 7 .

According to an embodiment, the discharge unit 600 may include an automatic valve module 610 and a nozzle 620. For example, the automatic valve module 610 is fastened into the barrel at one end of the conveying unit and may control whether or not to discharge a predetermined amount of the molded material based on the size value of the elastic force of the internal elastic body with respect to the fluid pressure. In addition, the nozzle 620 may output the ejected molding material to the outside of the extrusion device 1000 based on the operating state of the automatic valve module 610 .

According to one embodiment, the automatic valve module 610 may include an automatic valve body 612, a spring elastic body 614, and a needle block 616. For example, the automatic valve module 610 may be screwed into the barrel 701 and provide a space for the needle block 616 to slide up and down based on elastic force and fluid pressure. can Specifically, the automatic valve body 612 may be fastened within the barrel 701 and provide an internal space for the sliding movement of the needle block 616 and an opening/closing area for the movement of the molding.

The automatic valve body 612 provides an opening and closing space for the flow of the molded material provided from the transfer unit in the state of being inserted into the barrel 701, and as the moving molded material contacts the needle block 616, a predetermined fluid pressure is applied to the needle block ( 616) provides a space in which the needle block 616 can slide and move based on elastic force and fluid pressure.

According to one embodiment, the spring elastic body 614 may provide a predetermined elastic force to the needle block 616 by being inserted into the automatic valve body 612. More specifically, the spring elastic body 614 may provide a moving force for moving the needle block 616 up and down by providing an elastic force in a direction opposite to the direction of the net fluid pressure applied to the needle block. The modulus of elasticity of the spring elastic body 614 according to an embodiment may be set differently depending on the type, physical properties, and viscosity of the pellet-type material.

According to one embodiment, the needle block 616 is formed so that the fluid pressure is greater in the upper direction where the spring elastic body is located, and moves up and down within the automatic valve body based on the fluid pressure formed in the upper direction and the elastic force of the spring elastic body. can be moved repeatedly. Hereinafter, the structure and operation of the automatic valve body 612 and the needle block 616 will be described in detail with reference to FIGS. 8 and 9 .

8 is a diagram for explaining the structure of an automatic valve module according to an embodiment.

Referring to figure 810 of FIG. 8, the structure of a discharge unit formed at one end of the transfer unit and an automatic valve module within the discharge unit is shown. As noted above, the automatic valve module may include an automatic valve body shown in figure 820 with a needle block 824. According to one embodiment, the automatic valve body 612 is inserted into the barrel and is formed with a larger diameter than the insertion body 822, which provides an internal space for sliding the needle block and the insertion body, It includes an opening/closing area 832 for movement of the insertion body 822 and provides an internal space for the needle block 824 to slide and move, and a screw pattern formed on the outer circumferential surface of the opening/closing area 832. It may include a connection body 823 fastened to the screw pattern inside the barrel through a screw coupling method.

Referring to Figures 830 and 840, examples of observations from the lower surface of the connection body and diagonal lines viewed from the lower portion of the automatic valve body are shown. As shown in Figure 830, the connection body 823 extending from the lower side of the automatic valve body may be provided in the form of a cylinder with a screw pattern formed on the outer circumferential surface, and a partial area inside the cylinder is formed as an opening and closing area. It is possible to provide an opening/closing space within the cylinder for the movement of the molded article (eg, resin) transferred from the transfer unit. In addition, the connection body 823 may include at least one support body 834 extending from the connection body 823 to the insertion body 822 while dividing the opening and closing space for moving the molding.

9 is a diagram for specifically describing an operation and structure of an automatic valve module according to an exemplary embodiment.

According to one embodiment, the automatic valve module may include an automatic valve body, an elastic spring 912 and a needle block. According to one embodiment, the automatic valve body is inserted into the barrel, and the insertion body 90 provides a space in which the elastic body and the needle block can be located. (904).

Referring to figure 910, the melted resin (eg, molded product) from the conveying unit may move in an upper to lower direction 932 through an opening/closing space divided by a support body in the connection body 904. The molding moving through the connection body of the automatic valve body may apply a predetermined fluid pressure according to the contact area by contacting the needle block.

For example, the needle block is in contact with the elastic body 912 through the upper surface, and is formed with a larger diameter than the diameter of the first needle rod 922 sliding in the automatic valve body, the first needle rod, , A second needle rod 924 in which an area in contact with the molding in the upper direction toward the first needle rod is smaller than an area in contact with the molding in the opposite direction where the first needle rod is located, and the second needle rod 924 2 It may include a needle head 926 fastened to the center of the lower surface of the needle rod to open and close the exposure port of the nozzle.

The molding moving through the connection body of the automatic valve body may apply a predetermined fluid pressure to the upper surface and the lower surface of the second needle rod. According to one embodiment, among the upper surfaces of the second needle rod 924 of the needle block, the fluid pressure according to the pressure 1 934 and the pressure 2 936 is applied to the upper surface except for the area to which the first needle rod is connected. Among the lower surfaces of the second needle rod 924 of the needle block, the fluid pressure according to the pressures 3 (942) and 4 (944) may act on the remaining lower surfaces except for the area to which the needle head is connected. .

According to one embodiment, the second needle rod has a cylindrical cylinder shape, and the upper area excluding the area where the first needle rod extends may be formed smaller than the lower area excluding the area where the needle head extends. According to one embodiment, due to the structural characteristic that the upper area, excluding the area where the first needle rod extends, is formed smaller than the lower area, excluding the area where the needle head extends, the needle block is formed in an upward direction as a whole (for example, by pressing the elastic body). direction) can receive the net fluid pressure.

According to an embodiment, when the net fluid pressure provided to the second needle rod is greater than the elastic force provided to the lower direction of the needle block by the rotation of the screw or the high-speed rotation of the screw, the needle block moves in the upper direction, The needle head 926 is separated from the discharge port by a predetermined distance, and the discharge port can be opened. According to another embodiment, when the rotational motion of the screw is stopped or the screw rotates at a low speed, when the net fluid pressure provided to the second needle rod is less than the elastic force provided to the lower direction of the needle block, the needle block By moving downward by the elastic force, the needle head 926 is brought into contact with the discharge port 928, and the discharge port can be closed.

In addition, according to another embodiment, the upper surface of the second needle rod of the needle block is provided in a form convexly rising upward according to the slope of the first curved surface, thereby minimizing the area in contact with the fluid (eg, molten resin) to reduce It can receive fluid pressure, and the lower surface of the second needle rod is provided in a concave shape according to the slope of the second curved surface to receive more fluid pressure, thereby maximizing the area in contact with the fluid moving in the upward direction. They can also be designed to take on more fluid pressure. In addition, although not shown in FIG. 9, the needle head 926 extends from the center of the lower surface of the second needle rod without a change in inclination, and the other end is connected to the needle body and the needle tip that contacts the discharge port. It can also be divided into regions.

10 is a diagram for explaining the structure of a nozzle according to an embodiment.

Referring to figure 1022, the nozzle 1010 may include a nozzle body 1012 and a nozzle fixing block 1014. According to one embodiment, the nozzle body 1012 may be provided with a structure in which a needle block is partially inserted. In addition, according to an embodiment, the nozzle fixing block 1014 may provide a fastening function so that the nozzle body 1012 is fixed to the barrel of the transfer unit together with the automatic valve module.

11 is a block diagram of a control unit in a 3D printer extrusion device according to an embodiment.

According to one embodiment, the 3D printer extrusion device may further include a controller 1100. According to an embodiment, the controller 1100 may include a network interface 1120, a memory 1130 storing one or more instructions, and at least one processor 1110 executing the one or more instructions.

The network interface 1120 may transmit and receive control signals and design information for controlling the 3D printer device between the 3D printer extrusion device and the connected external device. The network interface 1120 may include one or more components that allow the 3D printer extrusion device 1000 to communicate with an external device. According to an embodiment, the network interface 1120 includes a Bluetooth communication unit, a Bluetooth Low Energy (BLE) communication unit, a Near Field Communication unit (WLAN) for performing a short-range wireless communication unit function. It may include a Wi-Fi) communication unit, a Zigbee communication unit, an infrared data association (IrDA) communication unit, a Wi-Fi Direct (WFD) communication unit, an ultra wideband (UWB) communication unit, etc., but is not limited thereto. In addition, the network interface 1120 may include at least one wired interface for connecting the 3D printer extrusion device 1000 and an external device.

According to one embodiment, the processor 1100 may overall control the operation of components within the 3D printer extrusion device 1000 by executing one or more instructions stored in the memory 1130. According to one embodiment, the processor 1100 may perform a series of sequences to control the operation of the 3D printer extrusion device by executing the control information received from the network interface 1120.

The memory 1130 may store one or more instructions for controlling the operation of the 3D printer extrusion device and information about a user interface for acquiring a user input related to the operation of the 3D printer extrusion device. According to an embodiment, the memory 1130 is a flash memory type, a hard disk type, a multimedia card micro type, or a card type memory (eg SD or XD memory, etc.), RAM (RAM, Random Access Memory) SRAM (Static Random Access Memory), ROM (ROM, Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), PROM (Programmable Read-Only Memory) , a magnetic memory, a magnetic disk, and an optical disk may include at least one type of storage medium.

The operating method of the screw-type 3D printer extrusion device according to the present disclosure may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on the medium may be those specially designed and configured for the present invention or those known and usable to those skilled in computer software.

Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic media such as floptical disks. - includes hardware devices specially configured to store and execute program instructions, such as magneto-optical media, and ROM, RAM, flash memory, and the like. Examples of program instructions include high-level language codes that can be executed by a computer using an interpreter, as well as machine language codes such as those produced by a compiler.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims are also included in the scope of the present invention. fall within the scope of the right

Claims (15)

In the screw type 3D printer extrusion device,
a driving unit providing a driving force for rotating a screw in the 3D printer extrusion device;
A material supply unit for obtaining a pellet type material from an external device connected to the 3D printer extrusion device, pulverizing the obtained pellet type material to a predetermined size, and providing the pellet type material pulverized to the predetermined size;
a transfer unit for transporting a molded product produced by compressing and melting the pellet-type material provided from the material supply unit; and
A nozzle of the needle block including a sliding needle block and sliding based on fluid pressure generated as the produced molded product contacts the needle block and elastic force of a spring elastic body located on an upper surface of the needle block. A discharge unit for discharging a predetermined amount of molding according to whether it is opened or closed; including,
The discharge part
At one end of the transfer unit, an automatic valve module fastened in the barrel of the transfer unit and providing an internal space for sliding movement of the needle block and an opening/closing area for movement of the molding; and
a nozzle having a discharge port opened and closed by the needle block; Including,
The automatic valve module
an insertion body providing a space into which the sliding needle block is inserted in a state where the spring elastic body is positioned on an upper surface of the needle block; and
a connection body that is fastened with a screw pattern inside the barrel through a screw pattern; 3D printer extrusion device comprising a. The method of claim 1, wherein the 3D printer extrusion device
Detachably connected to the material supply unit, storing the pellet-type material, pre-processing the stored pellet-type material, and pre-processing a predetermined amount based on the material detection sensing value received from the material supply unit. an external material supply device for supplying a pellet type material to the material supply unit; Further comprising, 3D printer extrusion device. The method of claim 2, wherein the driving unit
a motor generating the driving force;
a coupling for fastening the screw and the motor;
a reducer for transmitting a predetermined rotational output torque to the screw according to the output rotational speed of the motor; and
a bearing for providing mechanical flexibility between the screw and the motor fastened through the coupling; Including, 3D printer extrusion device. The method of claim 3, wherein the material supply unit
An extruder hopper for storing the pellet-type material provided from the external material supply device, sensing an amount of the stored pellet-type material, and supplying a predetermined amount of the pellet-type material according to the movement of the screw; and
Pellets that are connected to one end of the hopper of the extruder and pulverize the pellet-type material provided in the hopper of the extruder to a size within a predetermined range by using a plurality of grinding blades formed in a direction opposite to the direction of rotation of the screw. crushing module; Including, 3D printer extrusion device. The method of claim 4, wherein the pellet grinding module
A fastening unit for connecting the pellet grinding module to one end of the extruder hopper; and
a crushing unit including an internal space in which a screw is contained, and including a plurality of grinding blades formed in the internal space in a direction opposite to the rotational direction of the screw; Including, 3D printer extrusion device. The method of claim 5, wherein the grinding unit
A crushing tube provided with an outer circumferential surface in which a predetermined fixing portion for preventing rotation of the pellet pulverization module is formed on at least a portion thereof, and an inner circumferential surface including a plurality of pulverizing blades formed in a direction opposite to the rotational direction of the screw; Characterized in that it comprises, 3D printer extrusion device. The method of claim 6, wherein the cross section of each of the plurality of grinding blades includes two segments connected to the end point of the grinding blade formed closest to the screw in the grinding tube and two points formed on the inner circumferential surface of the grinding tube from the end point is triangular,
Of the two line segments formed from the end point, the length of the line segment located in the direction opposite to the direction in which the screw rotates is formed longer than the length of the other line segment, 3D printer extrusion device. The method of claim 4, wherein the transfer unit
A screw for transporting the pellet-type material while rotating along a predetermined screw axis, and generating a molded product produced by compressing and melting the transferred pellet-type material;
a barrel containing the screw therein and having one end providing a space for the screw to rotate;
a heater providing heat for melting the pellet-type material from the outside of the barrel to the screw in the barrel; and
a cooling unit formed outside the screw and configured to cool a partial area of the screw; Characterized in that it comprises a, 3D printer extrusion device. The method of claim 8, wherein the screw is divided into a supply area in which the pellet-type material is transferred, a compression area in which the transferred pellet-type material is compressed, and a metering area in which the compressed pellet-type material is melted and discharged Characterized in that, 3D printer extrusion device. delete The method of claim 8, wherein the automatic valve module
an automatic valve body fastened in the barrel and providing an internal space for sliding the needle block and an opening/closing area for moving the molding;
a spring elastic body inserted into the automatic valve body to provide a predetermined elastic force to the needle block; and
The needle block is formed so that the fluid pressure is greater in an upper direction where the spring elastic body is located, and moves repeatedly up and down within the automatic valve body based on the fluid pressure and the elastic force formed in the upper direction; Including, 3D printer extrusion device. The method of claim 11, wherein the automatic valve body
Inserted into the barrel, the insertion body; and
It is formed with a larger diameter than the diameter of the insertion body, includes an opening and closing area for moving the molding, provides an inner space for sliding the needle block together with the insertion body, and provides an outer circumferential surface of the opening and closing area. The connection body fastened to the screw pattern inside the barrel through the screw pattern formed in the screw coupling method; Including, 3D printer extrusion device. The method of claim 11, wherein the needle block
a first needle rod that is in contact with an elastic body through an upper surface and slides within the automatic valve body;
It is formed with a larger diameter than the diameter of the first needle rod, and an area in contact with the molded object in the upper direction toward the first needle rod is in contact with the molded object in the opposite direction where the first needle rod is located A second needle rod formed smaller than the area; and
a needle head fastened to the center of the lower surface of the second needle rod to open and close the outlet of the nozzle; Including, 3D printer extrusion device. The method of claim 13, wherein the needle head
A needle tip in contact with the discharge port;
a needle body having one end extending from the center of the lower surface of the second needle rod and the other end connected to the tip of the needle; Characterized in that it comprises a, 3D printer extrusion device. The method of claim 11, wherein the nozzle
a nozzle body into which the needle block is partially inserted; and
a nozzle fixing block for fixing the nozzle body to the barrel together with the automatic valve module; Including, 3D printer extrusion device.

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