3D Printing-Based Utility Duct Cover, 3D Printing Manufacturing Method Thereof, and Multi functional Nozzle Unit for 3D Printing

Abstract

The present invention relates to a 3D printing-based utility tunnel cover and a method for manufacturing the same, which allows for the free realization of various shapes and dimensions without using a mold, as well as customized design and rapid manufacturing, and also involves manufacturing a utility tunnel cover, etc. by 3D printing by spraying material through a nozzle part and transporting the finished product using said nozzle part. The 3D printing-based utility hole cover (10) according to the present invention is manufactured by 3D printing to include a surface layer (11) having an overall uniform structure with inwardly concave grooves on both opposing sides, and a lightweight reinforcing layer (12) formed with an uneven structure having a handle groove on the bottom surface of the surface layer. The lightweight reinforcing layer includes longitudinal ribs (12a) arranged along the longitudinal direction in the center of the surface layer, and a plurality of rows of transverse ribs (12b) formed towards both the left and right sides centered on the longitudinal ribs and arranged at a certain interval from each other along the longitudinal direction. Among the transverse ribs, the spacing between the transverse ribs at positions corresponding to the handle groove of the surface layer is made large enough to allow a worker's finger to be inserted, thereby forming a finger groove.

Description

Technology Field

[0001] The present invention relates to a utility tunnel cover, and more specifically, to a 3D printing-based utility tunnel cover that allows for custom manufacturing of various shapes and dimensions without using a mold, is lightweight, and has high strength, and a method for manufacturing the same.

[0002] delete Background Technology

[0003] Common conduits are constructed along roadsides, such as tunnels, to install cables (power cables, communication cables), etc., for supplying power to equipment (lighting, fire hydrants, etc.) installed inside the tunnel and for transmitting and receiving signals.

[0004] The utility tunnel is a box structure with an open top for installation and maintenance, and is opened and closed through the tunnel lid.

[0005] The above utility tunnel is constructed using on-site concrete pouring and precast concrete panels.

[0006] Utility tunnel covers are primarily made of reinforced concrete or cast iron and are manufactured using on-site casting with formwork or factory precasting methods.

[0007] However, conventional utility tunnel covers produced by concrete pouring (on-site, in the factory) have the following problems.

[0008] When changing the shape and dimensions of the lid, the formwork must be newly manufactured or modified, which results in excessive production costs and time.

[0009] In addition, due to its heavy weight, heavy equipment is essential for transportation and installation, and construction safety is compromised.

[0010] In addition, the interior is formed as a substantial structural body, resulting in high material usage and an excessive self-weight relative to structural efficiency.

[0011] It is difficult to address standard discrepancies or irregular openings in aging utility tunnels.

[0012] Meanwhile, although 3D printing technology for various products has recently been proposed, there is no 3D printing technology specifically for utility tunnel covers, and since 3D printer equipment only performs 3D printing by spraying material, there is the inconvenience of the operator having to transport the finished product after the 3D printing is completed.

[0013] Patent documents that can confirm the background technology of the present invention include registered patent No. 10-2632791 and registered patent No. 10-2590050, which are utility tunnel covers; registered utility model No. 20-0375723, which is a mold for manufacturing a utility tunnel cover; and published patent No. 10-2024-0118243, which is a 3D printing nozzle device capable of automatic curing. Prior art literature

[0014] Registered Patent No. 10-2632791, Registered Patent No. 10-2590050, Registered Utility Model No. 20-0375723, Published Patent No. 10-2024-0118243 The problem to be solved

[0015] The present invention aims to solve the problems described above by providing a 3D printing-based utility tunnel cover and a method for manufacturing the same, which allows for the free realization of various shapes and dimensions without using a mold, as well as customized design and rapid manufacturing. means of solving the problem

[0017] The 3D printing-based utility tunnel cover according to the present invention is manufactured by 3D printing to include a surface layer having an overall uniform structure with inwardly concave grooves on both opposing sides, and a lightweight reinforcing layer formed with an uneven structure having a handle groove on the bottom surface of the surface layer, wherein the lightweight reinforcing layer is characterized by including longitudinal ribs arranged along the longitudinal direction in the center of the surface layer, and a plurality of rows of transverse ribs formed towards both the left and right sides centered on the longitudinal ribs and arranged at a certain interval from each other along the longitudinal direction.

[0018] The method for manufacturing a 3D printing-based utility tunnel cover according to the present invention comprises: a first step of forming a plate-shaped surface layer by spraying material through the movement of a nozzle; and a second step of forming a lightweight reinforcing layer by forming a three-dimensional longitudinal rib along the longitudinal direction at the center of the surface layer formed through the first step, and forming a three-dimensional transverse rib at a certain interval along the longitudinal direction on both the left and right sides centered on the longitudinal rib.

[0019] The 3D printing multi-functional nozzle unit according to the present invention comprises: a nozzle tube that moves via a moving device and receives material for 3D printing and sprays it through a nozzle; and a gripper-guide that is formed protruding toward the bottom on both sides of the nozzle of the nozzle tube and maintains the material sprayed through the nozzle of the nozzle tube in three dimensions while gripping to transport the finished product after the completion of 3D printing, wherein the gripper-guide is formed as a pair to form a space for pouring the material and for gripping, is configured to be reciprocally movable so as to adjust the distance between them, and the distance between them is maintained through a driving means. Effects of the invention

[0020] The 3D printing-based cavity cover and the method for manufacturing the same according to the present invention have the following effects.

[0021] Since the 3D printing method eliminates the need for formwork fabrication, the manufacturing process is simplified and the manufacturing period is shortened, which ultimately reduces the costs of formwork fabrication and management and improves productivity. In addition, design changes can be easily made according to the shape, dimensions, and load conditions of the opening, allowing for flexible response to various site conditions, meaning that customized manufacturing is possible.

[0022] Furthermore, since it is very easy to design the surface layer to improve visibility without causing inconvenience to the worker, and to construct a lightweight and strength-reinforced structure for the bottom part that is not exposed to the outside, transportation and installation by the worker are very easy, and it has the effect of safely protecting the worker by preventing accidents that occur when transporting and installing heavy objects.

[0023] In addition, from a material perspective, since fiber reinforcements can be applied through material mixing without the need for a separate process, manufacturing is very easy and it is effective for producing high-strength products.

[0024] In addition, according to the 3D printing multi-functional nozzle unit, by using a guide that maintains the material linearly to transport the finished 3D printed product, it improves productivity by eliminating or reducing the worker's handling work and has the effect of safely protecting the worker by preventing accidents that occur when the worker transports the finished product. Brief explanation of the drawing

[0025] FIG. 1 is a top perspective view of a 3D printing-based cavity lid according to the present invention. FIG. 2 is a perspective view of a 3D printing-based utility tunnel lid according to the present invention in an inverted state. FIG. 3 is a manufacturing process diagram of a 3D printing-based cavity lid according to the present invention. FIG. 4 is a perspective view of a 3D printing multifunctional nozzle unit according to the present invention. FIG. 5 is a side view of a 3D printing multifunctional nozzle unit according to the present invention including a flat portion. FIG. 6 is a drawing of a state in which a guide combined with a gripper applied to a 3D printing multi-functional nozzle unit according to the present invention is used as a linear guide. FIG. 7 is a drawing of a 3D printing multifunctional nozzle unit according to the present invention being used as a gripper for transporting a cavity lid. FIG. 8 is a drawing showing the operation of a guide combined with a gripper applied to a 3D printing multifunctional nozzle unit according to the present invention. FIG. 9 is a drawing showing the movement of a 3D printing multifunctional nozzle unit and the state of a guide that doubles as a gripper according to the present invention. FIG. 10 is an exemplary diagram of a driving means for a guide combined with a gripper applied to a 3D printing multifunctional nozzle unit according to the present invention. Specific details for implementing the invention

[0026] In the following description of the present invention, specific descriptions of related known functions or configurations will be omitted if it is determined that such descriptions would unnecessarily obscure the essence of the invention. Furthermore, the terms described below are defined in consideration of their functions within the present invention, and these definitions may vary depending on the intentions or practices of the user or operator. Therefore, such definitions should be based on the content throughout this specification.

[0027] As shown in FIGS. 1 and 2, the 3D printing-based cavity cover (10) according to the present invention is formed with a layered structure of a surface layer (11) and a lightweight reinforcing layer (12), and is manufactured in a rectangular shape with a length longer than the width by 3D printing.

[0028] The surface layer (11) is the part visible from the outside and the part that the worker steps on and walks on, so the surface has a uniform structure overall (including a flat structure or a flat and anti-slip structure), and when viewed from a flat plane, it is approximately rectangular and includes inwardly concave handle grooves (11a) on two opposing sides.

[0029] The surface layer (11) can be configured so that glass beads are exposed on the surface, and the glass beads have a light-reflecting property that reflects light inside the tunnel to safely guide the driver and inspector, for example, through coating, etc.

[0030] The lightweight reinforcing layer (12) is formed at the bottom of the surface layer (11) and is not exposed to the outside. It is formed in a pattern that is lightweight and has sufficient rigidity to prevent deformation caused by a load transferred from a pedestrian. Preferably, it includes a longitudinal rib (12a) formed along the longitudinal direction in the center of the surface layer (11), and a plurality of transverse ribs (12b) formed towards both the left and right sides centered on the longitudinal rib (12a) and arranged at regular intervals along the longitudinal direction.

[0031] Among the transverse ribs (12b), the spacing between the transverse ribs (12b) at positions corresponding to the handle groove (11a) of the surface layer (11) forms a finger groove sized so that a worker's finger can be inserted.

[0032] The surface layer (11) and the lightweight reinforcing layer (12) have rounded corners to reduce damage.

[0033] The surface layer (11) and the lightweight reinforcing layer (12) may have the same height (thickness), that is, they may each be formed to half the height of the total height of the utility tunnel cover (10), or to increase the lightweighting effect, the surface layer (11) may make up 1 / 3 of the total height of the utility tunnel cover (10) and the lightweight reinforcing layer (12) may make up 2 / 3. At this time, when the effective height for stacking materials by 3D printing (e.g., 20 mm) is 1 / 3 of the total height of the utility tunnel cover (10), the surface layer (11) is formed in a single operation and the lightweight reinforcing layer (12) is formed in two operations (total 3-layer structure).

[0034] The materials for 3D printing can be anything used in the field of concrete 3D printing, and typically consist of water, fine aggregate, cement, admixtures, and additives as a base, to which fiber reinforcement for strength reinforcement and pigments for improving visibility through color may be included. Compared to the conventional process of pouring concrete for utility tunnel covers, which involves inserting a wire mesh structure for the first pour → installing the wire mesh → pouring the second time and then curing, the present invention simplifies the process caused by fiber reinforcement by mixing fiber reinforcement during the mixing of materials.

[0035] The 3D printing method for manufacturing a cavity cover according to the present invention is as follows (Fig. 3).

[0036] Figure 3 illustrates the spraying of materials as lines to show the specific manufacturing process, but the finished product is in a form that is connected as a whole without lines.

[0037] 1. Formation of surface layer.

[0038] A. Frame formation (A).

[0039] The nozzle is moved in a line shape and the material is sprayed to print a roughly rectangular frame (11-1) (including the handle groove). Due to the structure of the frame (11-1), the nozzle moves in a single stroke.

[0040] By forming the mold (11-1) first, the material can be prevented from spreading to the surroundings during the subsequent process of filling the mold, and thus, the surface of the cavity cover (10) can be finished cleanly without the need for separate surface finishing work (polishing, etc.).

[0041] B. Frame fill (B).

[0042] A surface layer (11) is formed by moving the nozzle and spraying material into the mold (11-1) to fill the filling portion (11-2).

[0043] It is preferable to fill the filling portion (11-2) using a single stroke drawing method. For example, the frame (11-1) has four corners, and the filling portion (11-2) is formed by spraying material while moving back and forth in a zigzag pattern between the corners, with one corner as the starting position and the opposite corner in the diagonal direction as the destination position.

[0044] Meanwhile, when glass beads are formed on the surface layer (11), glass beads are applied within the area to be formed on the surface layer (11) before forming the mold. That is, the glass bead layer is formed first, and then the mold (11-1) and the filling portion (11-2) are formed on top of it. At this time, the glass beads applied at the very bottom are bonded to the material forming the surface of the surface layer (11) to form the surface of the surface layer (11).

[0045] 2. Formation of a lightweight reinforcing layer.

[0046] a. Formation of a lightweight reinforcing layer in one stage (C).

[0047] It is moved from the position of the nozzle for forming the surface layer (11) to the height for forming the first stage of the lightweight reinforcing layer (12-1).

[0048] The starting position for forming the first stage of the lightweight reinforcing layer is preferably the arrival position when forming the filling portion (11-2) of the surface layer (11).

[0049] A lightweight reinforcing layer (12-1) is formed by moving the nozzle along a path that prints longitudinal ribs (12a) and transverse ribs (1b).

[0050] The drawing illustrates an example in which the nozzle moves back and forth and injects material in parallel twice to form longitudinal ribs (12a) and transverse ribs (1b), and through such movement, a single stroke drawing is possible.

[0051] B. Formation of two lightweight reinforcing layers (D).

[0052] After forming a first stage of lightweight reinforcing layer (12-1), a second stage of lightweight reinforcing layer (12-2) is formed on top of it, and the arrival position of the first stage of lightweight reinforcing layer (12-1) is set as the starting position of the second stage of lightweight reinforcing layer (12-2), and of course, the nozzle rises by the height of the second stage of lightweight reinforcing layer (12-2).

[0053] Such a process is possible by performing 3D modeling based on the design or 3D scanning data of the utility tunnel and converting it into G-code, and since it can be implemented using known technology, a detailed explanation is omitted.

[0054] In FIG. 4, the 3D printing multi-functional nozzle unit (hereinafter abbreviated as ‘multi-functional nozzle unit’) (100) according to the present invention comprises a nozzle tube (110) for spraying material, a gripper-combined guide (120) for linearly forming the material sprayed through the nozzle tube (110) and for gripping to transport the finished product of the printed molded product, and a wing portion (130) that is formed extending along the transverse direction centered on the nozzle tube (110) and guides the movement of the gripper-combined guide (120).

[0055] A 3D printing device to which a multi-functional nozzle unit (100) is applied includes a material supply unit (storage unit, metering unit, mixer, water supply unit, etc.), a transfer unit (pumping device, transfer pipe, etc.) for transferring the material of the material supply unit, a nozzle unit (including a multi-functional nozzle unit (100)) for spraying the material transferred and supplied through the transfer unit, a driving unit for moving the nozzle unit in the X, Y, and Z axis directions according to a code, and a controller for controlling the material supply unit, etc., and the nozzle unit may further include an opening / closing unit, a heating unit, a vibration unit, etc. in addition to the multi-functional nozzle unit (100).

[0056] The 3D printing device according to the present invention is preferably of a large gantry type that continuously produces a number of products (such as utility tunnel covers) sequentially while moving the nozzle part.

[0057] The nozzle tube (110) is a tubular tube with a hollow interior to spray material supplied from a material supply unit, with the upper and lower parts each open to receive material through the upper opening and spray material to the outside through the lower nozzle (111) (shown in FIG. 5), and the hollow interior can have various shapes such as square or circular.

[0058] Additionally, a glass bead nozzle may be further included next to the nozzle tube (110) to apply glass beads. The glass bead nozzle receives and applies glass beads through a glass bead supply unit (e.g., a tank in which glass beads are stored, a transfer device (screw, pump, etc.) that transfers glass beads stored in the tank), and may include an opening / closing valve.

[0059] As shown in FIG. 5, a flattening section (112) may be further included at the rear (rear in the direction of travel) of the nozzle opening (111) of the nozzle tube (110) to flatten the upper portion of the material sprayed from the nozzle tube (110) (flattening described in the present invention refers to flattening the upper portion of the material, pressing the material to attach it to the materials sprayed as a preceding operation on the side and integrating them). The flattening section (112) has a flat surface area so as to flatten the upper portion of the printing molded product (1) that is sprayed through the nozzle opening (111) and molded to have a constant width by the molding section (120), and extends to the rear of the nozzle opening (111).

[0060] The flat portion (112) can be assembled to the nozzle tube (110) so as to be detachable, and can also be assembled to the nozzle tube (110) so as to be height-adjustable.

[0061] As shown in FIGS. 4 and 6, the gripper-combined guide (120) is formed at the bottom of the nozzle opening (111) of the nozzle tube (110) and is formed at two locations on both the left and right sides relative to the direction of travel, thereby preventing the material ejected from the nozzle opening (111) from spreading to the left and right sides, thereby guiding the printed molded product (1) linearly and also gripping to transport the finished product (shown and described with the example of the opening cover (10)).

[0062] Figure 6 shows the gripper guide (120) in a position for linear guiding of the material.

[0063] FIG. 7 shows the state in which the gripper-guide (120) moves to the grip position and grips the utility room cover (10), and grips both sides of the longitudinal ribs (12a) of the aforementioned utility room cover (10).

[0064] FIGS. 8 and 9 illustrate a state in which one of the gripper-guided guides (120) has moved from a linear guide position to the end of the guide rail (131) and has rotated 90 degrees parallel to the wing portion (130). That is, two gripper-guided guides (120) can move together or each can move independently. Additionally, they can rotate sideways at the bottom of the wing portion (130) so as not to cause interference when the multi-functional nozzle unit (100) moves along the upper part of the cavity cover (10).

[0065] The gripper-combined guide (120) is configured to be movably installed on the wing portion (130) because the position of the linear guide and the position of the grip are different, and includes a guide body (121) and a movable shaft (122) that is movably installed on a guide rail (131) formed on the upper part of the guide body (121) and formed on the wing portion (130).

[0066] The gripper-combined guide (120) is connected to a driving means to move back and forth in a straight line along the guide rail (131).

[0067] The above driving means may include, for example as shown in FIG. 10, a pinion (123) coupled to a moving shaft (122), a motor that rotates the moving shaft (122), and a rack (124) formed along the longitudinal direction of a guide rail (131) to which the pinion (123) meshes, so that the moving shaft (122) rotates through the rotation of the motor and the pinion (123) moves along the rack (124). The gripper-guide (120) maintains both a linear guide position and a grip position through the power of the motor, thereby guiding the material in a linear shape of the same structure during linear guiding and also preventing the hole cover (10) from falling during transport.

[0068] The above motor can be controlled manually by an operator or automatically by a controller (control of movement to the grip position after 3D printing is completed).

[0069] The rotation means for rotating the gripper-guide (120) can rotate the guide (120) by rotating the moving shaft (122) 90 degrees using the motor while the guide (120) is moved to the end of the guide rail (131).

[0070] The driving means is not limited to the aforementioned and can be replaced with other means that perform the same function.

[0071] In this way, the distance between the gripper guides (120) can be adjusted by moving the gripper guides (120), and consequently, the width of the material being poured can be adjusted.

[0072] The wing portion (130) is a rod-shaped portion that extends along the lateral direction from the bottom portion (location of the injection port (111)) of the nozzle tube (110), and includes a guide rail (131) for the movement of the gripper-combined guide (120).

[0073] The guide rail (131) is formed linearly along the wing portion (130) and may be configured as a groove that opens toward the bottom (a dovetail shape to prevent falling off toward the bottom).

[0074] Although the wing portion (130) is shown as two in the drawing, three or more are possible. In this case, two wing portions are equipped with a guide (120) that doubles as a gripper, and the remaining one wing portion is equipped with a guide (120) that doubles as a gripper exclusively for gripping, thereby gripping the common opening cover (10) at three or more locations.

[0075] The wing portion (130) also includes the function of pressing and flattening the upper part of the material sprayed from the nozzle tube (110).

[0076] The 3D printing method using the 3D printing multifunctional nozzle unit according to the present invention is as follows.

[0077] 1. Set up the gripper / guide at the 3D printing location.

[0078] As shown in FIG. 6, a guide (120) that doubles as a gripper is set up at the 3D printing location.

[0079] Two gripper-combined guides (120) are positioned on both sides of the nozzle opening (111) of the nozzle tube (110) to prevent the material sprayed from the nozzle opening (111) from spreading to the left and right.

[0080] 2. 3D Printing.

[0081] The material is supplied into the interior of the nozzle tube (110), and the multi-functional nozzle unit (100) moves in accordance with the code to spray the material, and at this time, the material sprayed from the nozzle opening (111) of the nozzle tube (110) is poured only between the left and right gripper-combined guides (120).

[0082] In the process of 3D printing by spraying material, the present invention may include a process of flattening and compacting using a wing portion (120) and a guide (120) that serves as a gripper.

[0083] As shown in FIG. 9, after completing the 3D printing of the surface layer (11) of the utility hole cover (10), the multi-functional nozzle unit (100) can be moved so that the gripper-guide (120) is folded and aligned with the wing portion (130) to flatten and compact the upper surface layer (11) through the wing portion (130) and the gripper-guide (120).

[0084] Of course, even after the 3D printing of the lightweight reinforcing layer (12) is completed, the upper surface of the lightweight reinforcing layer (12) can be flattened and compacted.

[0085] 3. Set the gripper / guide at the grip position.

[0086] After completing 3D printing, the position of the gripper-guide (120) is switched to the grip position.

[0087] The grip position of the gripper guide (120) can be anywhere on the common opening cover (10).

[0088] FIG. 7 illustrates both sides of the longitudinal rib (12a) as an example. The multi-functional nozzle unit (100) is moved to the upper part of the cavity cover (10), and the gripper guide (120) is spread wider than the width of the longitudinal rib (12a). Then, the multi-functional nozzle unit (100) is lowered so that the longitudinal rib (12a) is inserted between the gripper guides (120). Afterward, the gripper guides (120) are brought together to grip both sides of the longitudinal rib (12a).

[0089] 4. Transport.

[0090] The multi-functional nozzle unit (100) is raised to lift the cavity cover (10) and move it to the side (loading place) of the 3D printing location.

[0091] Next, the multi-functional nozzle unit (100) is lowered to place the cavity cover (10) on the floor, and the gripper-guide (120) is spread apart to detach it from the longitudinal rib (12a) and then returned to the 3D printing position. Explanation of the symbols

[0092] 10 : Utility tunnel cover, 11: Surface layer, 11a: Handle groove 12: Lightweight reinforcement layer, 12a: Longitudinal rib 12b: Transverse rib, 12-1, 12-2: 1st and 2nd lightweight reinforcing layers 100 : 3D Printing Multifunctional Nozzle Unit, 110: Nozzle tube, 111: Spray nozzle 112 : Flat section, 120: Gripper / Guide, 121: Guide Body 122: Moving axis, 123: Pinion 124 : Rack, 130: Wing section, 131: Guide rail

Claims

Claim 1 A 3D-printed utility tunnel cover is manufactured by 3D printing to include a surface layer having a uniform surface structure with inwardly concave handle grooves on both opposing sides, and a lightweight reinforcing layer formed with an uneven structure having lightweighting and handle grooves on the bottom surface of the surface layer, wherein the surface layer is integrally formed with a three-dimensional mold formed along the outer edge and a filling part filling the interior of the mold, and the lightweight reinforcing layer includes a longitudinal rib formed along the longitudinal direction in the center of the surface layer and a plurality of rows of transverse ribs arranged at regular intervals along the longitudinal direction on both the left and right sides centered on the longitudinal rib and continuously connected to the longitudinal rib, wherein the spacing between the transverse ribs at positions corresponding to the handle grooves of the surface layer is sized to allow a worker's finger to be inserted, thereby forming a finger groove. Claim 2 A 3D-printed cavity lid according to claim 1, characterized in that the lightweight reinforcing layer consists of two or more layers stacked with the same height as the surface layer. Claim 3 A 3D printing-based cavity lid according to claim 1 or claim 2, characterized in that the surface of the surface layer includes glass beads. Claim 4 A method for manufacturing a 3D printing-based utility tunnel cover according to claim 1, comprising: a first step of printing a mold of a three-dimensional shape by spraying material while moving a nozzle; a first step of forming a plate-shaped surface layer by spraying material into the mold formed through the first step while moving the nozzle and filling it, wherein the surface layer is formed by a continuous stroke method in which the nozzle moves continuously and sprays material with the arrival position of the previous spray as the starting position of the next spray; and a second step of forming a lightweight reinforcing layer by forming a longitudinal rib of a three-dimensional shape along the longitudinal direction in the center of the surface layer while moving the nozzle in a continuous stroke method with the arrival position of the first step as the starting position, and forming transverse ribs at regular intervals along the longitudinal direction on both the left and right sides centered on the longitudinal rib. Claim 5 delete Claim 6 A method for manufacturing a 3D printing-based cavity lid according to claim 4, characterized by including a process of applying glass beads to an area forming the surface layer prior to the first step (1-1) to expose glass beads on the surface of the surface layer. Claim 7 delete Claim 8 A method for manufacturing a 3D printing-based utility tunnel cover according to claim 4, wherein the nozzle is a 3D printing multi-functional nozzle unit that moves via a moving device and receives material for 3D printing and sprays it through a nozzle; and a gripper-guide formed to protrude toward the bottom on both sides of the nozzle of the nozzle, which maintains the material sprayed through the nozzle of the nozzle in three dimensions and grips it to transport a finished product after the completion of 3D printing, wherein the gripper-guide is formed as a pair to form a space for pouring the material and transport the finished product, is configured to be reciprocally movable so as to adjust the distance between them, and maintains the distance between them and grips the finished product through a driving means. Claim 9 A method for manufacturing a 3D printing-based cavity lid according to claim 8, comprising a guide rail that is extended along the transverse direction of the nozzle tube and is provided with a guide rail, wherein the gripper-combined guide moves along the guide rail. Claim 10 A method for manufacturing a 3D printing-based cavity lid according to claim 8 or claim 9, wherein the gripper-combined guide is installed in a foldable manner so as not to interfere with the printed molded article during the 3D printing process.

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