Multi-component co-extrusion preparation equipment and process for biocompatible 3D printing wire rod

Abstract

The invention provides multi-component co-extrusion preparation equipment and process for a biocompatible 3D printing wire rod, and belongs to the technical field of printer equipment. The problem that existing co-extrusion precision is insufficient is solved. According to the multi-component co-extrusion preparation equipment and process for the biocompatible 3D printing wire rod, a printing main body with a co-extrusion unit and a control unit is included, the co-extrusion unit comprises an assembly column and material extrusion rings, and semicircular grooves are formed in the end faces of the upper and lower adjacent material extrusion rings; a plurality of through holes communicated with the corresponding runners are formed in the peripheral wall, located at the corresponding runners, of the feeding structure, feeding connector pipes which are connected with the feeding structure and facilitate feeding are arranged at the positions, located at the through holes, of the feeding structure, and communicating holes are formed in the extrusion rings with the two semicircular grooves; limiting covers are arranged at the two ends of the assembling column respectively, the two limiting covers are an upper cover and a lower cover from top to bottom, and a discharging pipe is arranged on the lower cover. The method has the advantage of high tool precision.

Description

Technical Field

[0001] The present invention belongs to the technical field of printer equipment and relates to a multi-component co-extrusion preparation device and process for biocompatible 3D printing filaments. Background Art

[0002] 3D printing technology can efficiently form parts with complex shapes at a low cost and is widely used in fields such as aviation, automobile manufacturing, and biomedicine. Common additive manufacturing technologies include photocuring, material extrusion molding, spray powder forming process, material jetting, lamination, powder bed fusion, and direct energy deposition. Among these additive manufacturing technologies, fused deposition modeling, or filament manufacturing, forms objects by melting thermoplastic materials, extruding them, and stacking them layer by layer. Due to its simple structure, low cost, low difficulty of use, and high printing freedom, however, in actual operation, there is insufficient co-extrusion control accuracy: the lack of independent and precise control of the feeding timing, speed, and ratio of multiple materials makes it difficult to achieve precise preparation of complex gradient materials or biomaterials that require specific mixing sequences and time windows; mixing uniformity and efficiency challenges: the existing equipment structure can easily lead to uneven mixing, laminar separation, or the formation of dead zones when mixing multiple components simultaneously in a single flow channel. Especially for biomaterials with large viscosity differences, it is difficult to ensure sufficient and controllable homogeneous mixing before extrusion, thus failing to meet usage requirements. Summary of the Invention

[0003] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and provide a multi-component co-extrusion preparation device and process for biocompatible 3D printing filaments to solve the above-mentioned problems.

[0004] The objectives of the present invention can be achieved through the following technical solutions: A multi-component co-extrusion preparation device and process for biocompatible 3D printing wire, including a printing body with a co-extrusion unit and a control unit, characterized in that the co-extrusion unit includes a hollow assembly column and a plurality of extrusion rings sleeved on the assembly column and used for extruding materials, and the plurality of extrusion rings are spliced ​​together to form a feeding structure, and the end faces of the two upper and lower adjacent extrusion rings are provided with coaxially arranged semicircular grooves, and the two adjacent extrusion rings are spliced ​​together to form a complete flow channel with two corresponding semicircular grooves, and the outer peripheral wall of the feeding structure located at the corresponding flow channel is provided with a plurality of through holes connected to the corresponding flow channel, and the feeding structure is provided with a feeding connector connected to the through hole and convenient for feeding. The tube, the extrusion ring with two semicircular grooves is provided with a connecting hole that connects the two semicircular grooves, and several of the connecting holes are staggered. The two ends of the assembly column are provided with a limit cover connected thereto and used to limit the position of the extrusion ring. The two limit covers are respectively an upper cover and a lower cover from top to bottom. The lower cover is provided with a discharge pipe connected thereto and used for discharging materials. The several flow channels are respectively flow channel one, flow channel two, flow channel three, flow channel four and flow channel five from top to bottom. The several feed joint pipes are respectively joint one, joint two, joint three, joint four and joint five from top to bottom. The feed structure is located on the groove wall at flow channel five and is provided with a through hole groove that is inclined and connects flow channel five with the assembly column. The feed structure can be provided with a feed pipe at the through hole groove. The control unit can be used to control the feeding speed and feeding time of connector 1, connector 2, connector 3, connector 4 and connector 5. After mixing, they flow into the assembly column through the through-hole groove and are mixed and extruded through the discharge pipe. The co-extrusion process of this printed body is as follows: For example, when it is necessary to control the co-extrusion of 5 mixed materials, the feeding speed of joint 1, joint 2, joint 3, joint 4 and joint 5 is set to a, and the feeding time is t1, t2, t3 and t4 respectively. The feeding time is the start interval time. Joint 1 is fed first. When the feeding time reaches t1, joint 2 is fed. When the feeding time reaches t2, the materials of joint 1 and joint 2 are mixed and extruded, and joint 3 is fed at the same time. When the feeding time reaches t3, the materials of joint 1, joint 2 and joint 3 are mixed and extruded, and joint 4 is fed at the same time. When the feeding time reaches t4, the materials of joint 1, joint 2, joint 3 and joint 4 are mixed and extruded, and joint 5 is fed at the same time, and mixed and extruded with the materials of the above-mentioned joints 1, 2, joint 3 and joint 4, and finally enter the assembly column through the through-hole slot and finally extrude through the discharge pipe.

[0005] In the above-mentioned multi-component co-extrusion preparation equipment and process for biocompatible 3D printing filaments, the feeding structure is located in the flow channel and can be provided with a heating ring connected thereto and used for heating. The heating ring can maintain the temperature in the flow channel to prevent solidification during feeding. When the heating ring is used, it needs to be equipped with a temperature sensor, which is communicatively connected to the control unit.

[0006] In the above-mentioned multi-component co-extrusion preparation equipment and process for biocompatible 3D printing filaments, a pressure hole axially penetrating the upper cover is provided on the upper end surface of the upper cover, and a pressure joint is provided on the upper cover at the pressure hole, which facilitates extrusion after mixing.

[0007] Compared with the existing technology, the multi-component co-extrusion preparation equipment and process of the biocompatible 3D printing filament can ensure the mixing ratio of the co-extrusion materials through the feeding structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a schematic diagram of the cross-sectional structure of the multi-component co-extrusion preparation equipment and the co-extrusion unit in the process of the biocompatible 3D printing filament.

[0009] In the figure, 1, assembly column; 2, extrusion ring; 3, upper cover; 4, lower cover. DETAILED DESCRIPTION

[0010] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0011] like Figure 1As shown, a multi-component co-extrusion preparation device and process for biocompatible 3D printing wire includes a printing body with a co-extrusion unit and a control unit, characterized in that the co-extrusion unit includes a hollow assembly column 1 and a plurality of extrusion rings 2 sleeved on the assembly column 1 and used for extruding materials, and the plurality of extrusion rings 2 are spliced ​​together to form a feeding structure, and the end faces of the two upper and lower adjacent extrusion rings 2 are provided with coaxially arranged semicircular grooves, and the two adjacent extrusion rings 2 are spliced ​​together to form a complete flow channel with two corresponding semicircular grooves, and the outer peripheral wall of the feeding structure located at the corresponding flow channel is provided with a plurality of through holes connected to the corresponding flow channel, and the feeding structure is provided with a feeding joint pipe connected to it and convenient for feeding at the through hole, and the above-mentioned device has two The extrusion ring 2 of the semicircular groove is provided with a connecting hole that connects the two semicircular grooves, and several of the connecting holes are staggered. The two ends of the assembly column 1 are provided with a limit cover connected thereto and used to limit the position of the extrusion ring 2. The two limit covers are respectively an upper cover 3 and a lower cover 4 from top to bottom. The lower cover 4 is provided with a discharge pipe connected thereto and used for discharging. The several flow channels are respectively flow channel 1, flow channel 2, flow channel 3, flow channel 4 and flow channel 5 from top to bottom. The several feed joint pipes are respectively joint 1, joint 2, joint 3, joint 4 and joint 5 from top to bottom. The feed structure is located on the groove wall at flow channel 5 and is provided with a through hole groove that is inclined and connects flow channel 5 with the assembly column 1. The feed structure can be provided with a feed pipe at the through hole groove. The control unit can be used to control the feeding speed and feeding time of connector 1, connector 2, connector 3, connector 4 and connector 5. After mixing, they flow into the assembly column 1 through the through-hole groove and are mixed and extruded through the discharge pipe. The co-extrusion process of this printed body is as follows: For example, when it is necessary to control the co-extrusion of five mixed materials, the feeding speed of joint 1, joint 2, joint 3, joint 4 and joint 5 is set to a, and the feeding time is t1, t2, t3 and t4 respectively. The feeding time is the start interval time. Joint 1 is fed first. When the feeding time reaches t1, joint 2 is fed. When the feeding time reaches t2, the materials of joint 1 and joint 2 are mixed and extruded, and joint 3 is fed at the same time. When the feeding time reaches t3, the materials of joint 1, joint 2 and joint 3 are mixed and extruded, and joint 4 is fed at the same time. When the feeding time reaches t4, the materials of joint 1, joint 2, joint 3 and joint 4 are mixed and extruded, and joint 5 is fed at the same time, and mixed and extruded with the materials of the above-mentioned joints 1, 2, joint 3 and joint 4, and finally enter the assembly column 1 through the through-hole slot, and finally extrude through the discharge pipe.

[0012] In the above-mentioned multi-component co-extrusion preparation equipment and process for biocompatible 3D printing filaments, the feeding structure is located in the flow channel and can be provided with a heating ring connected thereto and used for heating. The heating ring can maintain the temperature in the flow channel to prevent solidification during feeding. When the heating ring is used, it needs to be equipped with a temperature sensor, which is communicatively connected to the control unit.

[0013] In the above-mentioned multi-component co-extrusion preparation equipment and process for biocompatible 3D printing filaments, a pressure hole axially penetrating the upper cover 3 is provided on the upper end surface of the upper cover 3, and a pressure joint is provided at the pressure hole of the upper cover 3, which facilitates extrusion after mixing.

[0014] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

[0015] Although the present invention uses more terms such as ", " and ", ... (" and " and ", " and ", " and ", " and ", " and ", " and ", " and ", (" and " and " and " and " and " and " and " and " and " and " and " and " and " and " and " and " and " and " and " and " and " and " and " and " and " and " and " and " and " and " and " and " and " and

Claims

1. A multi-component co-extrusion preparation device and process for biocompatible 3D printing filaments, comprising a printing body with a co-extrusion unit and a control unit, characterized in that: The co-extrusion unit comprises a hollow assembly column (1) and a plurality of extrusion rings (2) sleeved on the assembly column (1) and used for extrusion, and the plurality of extrusion rings (2) are spliced ​​together to form a feeding structure, and the end faces of the two upper and lower adjacent extrusion rings (2) are provided with coaxially arranged semicircular grooves, and the two adjacent extrusion rings (2) are spliced ​​together so that the two corresponding semicircular grooves form a complete flow channel, and the outer peripheral wall of the feeding structure at the corresponding flow channel is provided with a plurality of through holes connected to the corresponding flow channel, and the feeding structure is provided with a feeding joint pipe connected to the through hole and convenient for feeding, and the extrusion ring (2) with two semicircular grooves is provided with a connecting hole that connects the two semicircular grooves. Holes, several of the communicating holes are staggered, and both ends of the assembly column (1) are provided with limit covers connected thereto and used to limit the position of the extrusion ring (2), and the two limit covers are respectively an upper cover (3) and a lower cover (4) from top to bottom, and the lower cover (4) is provided with a discharge pipe connected thereto and used for discharging, and the several flow channels are respectively flow channel 1, flow channel 2, flow channel 3, flow channel 4 and flow channel 5 from top to bottom, and the several feed joint pipes are respectively joint 1, joint 2, joint 3, joint 4 and joint 5 from top to bottom, and the feed structure is provided with a through hole groove on the groove wall at the flow channel 5, which is inclined and connects the flow channel 5 with the assembly column (1), and the feed structure can be provided with a feed pipe at the through hole groove, The control unit can be used to control the feeding speed and feeding time of the connector 1, connector 2, connector 3, connector 4 and connector 5. After mixing, the connectors flow into the assembly column (1) through the through-hole groove and are mixed and extruded through the discharge pipe. The co-extrusion process of this printed body is as follows: For example, when it is necessary to control the co-extrusion of five mixed materials, the feed speeds for connector 1, connector 2, connector 3, connector 4 and connector 5 are set to a, and the feed times are t1, t2, t3 and t4 respectively. The feed time is the start interval time. Connector 1 first feeds the material. When the feed time reaches t1, connector 2 feeds the material. When the feed time reaches t2, the materials of connector 1 and connector 2 are mixed and extruded, and connector 3 feeds the material at the same time. When the feed time reaches t3, the materials of connector 1, connector 2 and connector 3 are mixed and extruded, and connector 4 feeds the material at the same time. When the feed time reaches t4, the materials of connector 1, connector 2, connector 3 and connector 4 are mixed and extruded, and connector 5 feeds the material at the same time. The material is mixed and extruded with the materials of connector 1, connector 2, connector 3 and connector 4, and finally enters the assembly column (1) through the through-hole slot and is finally extruded through the discharge pipe.

2. The multi-component co-extrusion preparation equipment and process for a biocompatible 3D printing wire according to claim 1, characterized in that: The feeding structure is located in the flow channel and can be provided with a heating ring connected to it and used for heating. The heating ring can maintain the temperature in the flow channel to prevent solidification during feeding. When the heating ring is used, it needs to be equipped with a temperature sensor, which is communicated with the control unit.

3. The multi-component co-extrusion preparation equipment and process for biocompatible 3D printing wire according to claim 1, characterized in that: A pressure hole is provided on the upper end surface of the upper cover (3) and axially penetrates the upper cover (3). A pressure joint is provided on the upper cover (3) at the pressure hole, and extrusion after mixing is facilitated by the pressure joint.

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