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Double-screw stirring and extruding device for bone cement 3D printing

A 3D printing and extrusion device technology, applied in ceramic molding machines, manufacturing tools, additive processing, etc., can solve problems such as low mixing efficiency and difficult molding, and achieve the effects of improving efficiency, improving compactness, and improving fluidity

Inactive Publication Date: 2021-06-18
JINLING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to address the deficiencies in the prior art, to provide a twin-screw stirring and extruding device for bone cement 3D printing, to overcome the problem of difficulty in forming bone cement slurry in 3D printing in the prior art, and the device can both stir and solidify , liquid two-phase, forming a uniform bone cement paste, and can effectively extrude the bone cement paste, avoiding the phenomenon of filter pressure and phase separation in piston extrusion and other devices, and also avoiding the mixing efficiency of single screw for some materials Lower problems, while improving 3D printing output stability, printing efficiency and accuracy

Method used

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  • Double-screw stirring and extruding device for bone cement 3D printing
  • Double-screw stirring and extruding device for bone cement 3D printing

Examples

Experimental program
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Effect test

Embodiment 1

[0041] A twin-screw stirring and extruding device for bone cement 3D printing, including a housing 10, a solid phase feeding device 20, a liquid phase feeding device 30, a screw device 40 and a discharging device 50; wherein, the solid phase feeding device 20 Comprising motor 21, solid phase feed hopper 22 and screw blade 23; Liquid phase feed device 30 comprises peristaltic pump 31, hose 32 and feeding interface 33; Screw device 40 comprises motor 41, first screw rod 42 and second screw rod 43; the discharge device 50 includes a discharge extension pipe 51 and a discharge port 52;

[0042] The housing 10 is a hollow structure with a columnar structure in the middle, a columnar structure extending obliquely upward on the left side of the top, and an inverted convex structure at the bottom; There is an opening connected to the solid phase feeding device 20 at the end of the columnar structure, an opening connected to the solid phase feeding hopper 22 is left in the middle and u...

Embodiment 2

[0053] First, a traditional piston-assisted extrusion device is used, the size of the discharge port is 2mm, the phosphate bone cement is used as the printing material, the ratio of the solid phase and the liquid phase is 1.5g / ml, and the solid and liquid phases are stirred evenly before being placed. Into the barrel, the discharge speed is adjusted to 40g / min. Then adopt a kind of bone cement 3D printing of the present invention to use twin-screw stirring and extruding device (such as figure 1 As shown), the same phosphate bone cement was used as the printing material, the solid phase feeding speed was adjusted to 80g / min, the liquid phase feeding speed was adjusted to 13ml / min, and the ratio of solid phase and liquid phase was 1.5g / ml. The diameter of the discharge port is 3 mm, the diameter of the discharge extension pipe and the opening diameter of the discharge extension pipe are both 2 mm, and the discharge speed is about 40 g / min. The piston propulsion force of its tra...

Embodiment 3

[0055] Firstly, a traditional piston-assisted extrusion device was adopted, the size of the discharge port was 2mm, and the phosphate bone cement was selected as the printing material. The ratio of solid phase and liquid phase (solid-liquid ratio) was 1.5g / ml. After the phase is stirred evenly, it is put into the barrel, and the discharge speed is adjusted to 40g / min. Then use a twin-screw stirring and extrusion device for bone cement 3D printing of the present invention, use the same bone cement as the printing material, adjust the solid phase feed rate to 80g / min, and the liquid phase feed rate to 13ml / min, The ratio of solid phase to liquid phase (solid-liquid ratio) is 1.5g / ml, the diameter of the discharge port is 3mm, the diameter of the discharge extension tube is 2mm, and the discharge speed is about 40g / min. Test the solid-to-liquid ratio (g / ml) of the bone cement paste at the printing outlet at 0min, 1min, 5min, 10min, 15min, 20min, and 25min respectively, and the re...

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Abstract

The invention discloses a double-screw stirring and extruding device for bone cement 3D printing, and belongs to the field of 3D printing. The double-screw stirring and extruding device mainly comprises a shell, a solid-phase feeding device, a liquid-phase feeding device, a screw device and a discharging device; the solid-phase feeding device comprises a motor, a solid-phase feeding hopper and a spiral blade; the liquid-phase feeding device comprises a peristaltic pump, a hose and a feeding connector; the screw device comprises a motor, a first screw and a second screw, wherein the first screw and the second screw are opposite in rotation direction; and the discharging device comprises a discharging extension pipe and a discharging port. The double-screw design is adopted, solid-phase materials and liquid-phase materials can be stirred and mixed evenly, slurry can be effectively extruded, and the phenomena of phase separation, pressure filtering, discharging port blockage and the like of a traditional extruding device are avoided; and the problem that the stirring efficiency of a single screw on part of materials is low is solved, and the 3D printing discharging stability, printing efficiency and precision can be improved.

Description

technical field [0001] The invention relates to the field of 3D printing devices for biomedical materials, in particular to a twin-screw stirring and extruding device for 3D printing, which is an integration of solid and liquid two-phase entry, mixing, stirring, and extrusion of a bone cement 3D printer. s installation. Background technique [0002] The information disclosed in the Background of the Invention is only intended to increase the understanding of the general background of the invention, and is not necessarily to be taken as an acknowledgment or any form of suggestion that the information constitutes the prior art that is already known to those skilled in the art. [0003] Bone is the largest tissue in the human body and is also the most likely to cause defects. The number of patients with traumatic fractures, bone tissue necrosis, and bone tissue defects caused by aging, orthopedic diseases, traffic and sports accidents, etc. is increasing day by day. Most of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B1/00B33Y30/00B33Y40/10
CPCB28B1/001B33Y30/00B33Y40/10
Inventor 林青刘苗苗吴禧航赵毅杰王威张小娟郝凌云
Owner JINLING INST OF TECH
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