RU191409U1 - CONCRETE MIXING DEVICE BY ADDITIVE PRINTING METHOD - Google Patents

Abstract

The utility model relates to the technology of additive manufacturing of three-dimensional objects by layer-by-layer deposition of building material using 3D printing.The useful model is aimed at obtaining products of complex shape by the additive 3D printing method by extruding building materials of high viscosity by gradually changing the stack exit direction towards its stacking. The essence of the utility model lies in the fact that the device for laying concrete mixture by the additive printing method contains cylinder 1 for concrete mixture with the ability to move over the platform. The nozzle 2 is attached to the bottom of the cylinder 1 with the possibility of rotation, for example, through the fastening device 3. The nozzle 2 in this case has an elongated shape with a variable cross-section, for example, from round to rectangular, and with a bend in radius, ensuring the exit of the material parallel to the laying plane. In this case, the piston 4 is mounted in the cylinder 1 with the possibility of vertical movement.

Description

The utility model relates to the technology of additive manufacturing of three-dimensional objects by layer-by-layer deposition of building material using 3D printing.

A device for casting concrete products is known [RF patent for the invention No. 2670817 of the author Eilola Yani, published November 28, 2018, bull. No. 34], intended for casting a concrete product into a mold. The device contains a container for concrete mixture, a nozzle and a shutter element. In this case, the container is installed with the possibility of movement over the mold. The nozzle is attached to the bottom of the container and is designed to supply concrete mix from the specified container to the mold. The shutter element is mounted with the possibility of movement in the vertical direction and is made passing through the container into the nozzle. Moreover, the width of the specified nozzle in the first horizontal direction is much larger than the width of the nozzle in the second horizontal direction. Moreover, the specified second direction is perpendicular to the first direction. Moreover, the container for concrete mixture is mounted with the possibility of rotation around its vertical Central axis to change the orientation of the nozzle during the casting process.

A disadvantage of the known device is that during the laying of the material cracks and gas sinks occur with a sharp change in the geometry of the stack.

The closest technical solution adopted for the prototype is a raw material extrusion device for 3D prints [China Patent for Invention No. 207059235 by Wu Tao, Liang Lin, Xiao Shiyu, published on 03/02/2018]. The device comprises a cylinder with raw materials (cylinder for concrete mix), a pushing plate located on the upper part of the internal cavity of the cylinder with raw materials, and the outer edge of the pressure plate is hermetically closed by the inner wall of the cylinder with raw materials. The pushing plate is connected to the piston with the possibility of vertical movement of the pushing cylinder, and the lower part of the inner cavity of the cylinder with raw materials communicates with the upper part of the inner cavity of the heating cylinder, and the heating cylinder is equipped with a second group of coils wound on its side wall, a heating cylinder. The inner cavity is provided with a second spiral metal blade, while the lower part of the inner cavity of the heating cylinder communicates with the upper part of the inner cavity of the nozzle, and the diameter of the inner cavity of the nozzle gradually decreases from top to bottom.

The following features of the prototype coincide with the essential features of the utility model: a cylinder, a piston mounted with the possibility of vertical movement, and a nozzle attached to the bottom of the cylinder.

A disadvantage of the known device is that during the laying of a material with high viscosity, cracks and gas sinks occur with a sharp change in the direction of the stack exit.

The utility model is aimed at obtaining products of complex shape by the method of additive 3D printing by extruding building materials of high viscosity due to the gradual change in the direction of the stack exit towards its stacking.

This is achieved by the fact that the device for laying concrete mixture by the additive printing method comprises a cylinder for concrete mixture with the possibility of movement above the platform, in which a piston with the possibility of vertical movement and a nozzle attached to the cylinder bottom are installed. In the proposed solution, the nozzle is attached to the bottom of the cylinder with the possibility of rotation. The nozzle has an elongated shape with a variable cross-section and a bend along the radius, which ensures the exit of the material parallel to the laying plane.

In FIG. 1 shows a General view of the device for laying concrete mixture by the additive printing method.

The device for laying concrete mixture by the additive printing method comprises a cylinder 1 for concrete mixture with the possibility of movement over the platform (not shown in Fig.). The nozzle 2 is attached to the bottom of the cylinder 1 with the possibility of rotation, for example, through the fastening device 3. The nozzle 2 has an elongated shape with a variable cross-section, for example, from round to rectangular, and with a curvature along the radius ensuring the exit of the material parallel to the laying plane. In this case, the piston 4 is mounted in the cylinder 1 with the possibility of vertical movement.

The device for laying concrete mixture by the additive printing method works as follows. The building material, for example, cement-concrete mixture, is preloaded into the cylinder 1, into which the piston 4 is then installed. The piston 4 is controlled by, for example, a jack (not shown in Fig.). Building material under pressure from the piston 4 rushes into the nozzle 2. In this case, the nozzle 2 is previously rotated through the fastening device 3 in the direction opposite to the direction of movement of the cylinder 1 above the platform (not shown in Fig.). Due to the change in the cross-sectional shape of the nozzle 2, the stack gradually takes the required geometry, for example, rectangular, and also due to the curvature of the nozzle 2 along the radius, the building material exits in the stacking direction parallel to the plane of the resulting product, which prevents cracks and gas sinks during the laying of the material with increased viscosity.

The utility model allows to obtain products of complex shape by the method of additive 3D printing by extruding building materials of high viscosity due to a gradual change in the direction of the stack exit of the desired rectangular shape in the direction of its laying.

Claims (1)

A device for laying concrete mixture by the additive printing method, comprising a cylinder for concrete mixture, in which a piston is mounted with the possibility of vertical movement and a nozzle attached to the cylinder bottom, characterized in that the cylinder is mounted to move above the platform, and the nozzle attached to the cylinder bottom with the ability to rotate, has an elongated shape with a variable cross-section and curvature along the radius, ensuring the exit of the material parallel to the laying plane.

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