CN218084188U - Double-nozzle 3D printer - Google Patents

Abstract

The utility model discloses a double-nozzle 3D printer, which comprises a triaxial printing platform, wherein a loading plate is arranged on the triaxial printing platform, and a plurality of types of material storage mechanisms and extrusion heads are arranged on the front surface of the loading plate; the multi-type material storage mechanism is connected with the discharging power set and is provided with at least two discharging holes; the extrusion head is communicated with the discharge hole of the double material storage mechanism and is a single extrusion hole; the extrusion head comprises a multi-way pipe, a throat pipe, a heating block, a heat dissipation block, a heat induction unit and a nozzle; the nozzle is a flat head needle, and the diameter of the outlet of the nozzle 46 is 0.1-0.6mm. This printer is applicable to the biological aquogel printing material of intensive mixing through the ejection of compact mode of advancing one more, and produces high-pressure air with the air pump of pneumatic extrusion mechanism and promote the aquogel to valve control gas switch, overall structure is simple, and it is outstanding with the controllability to operate steadily, makes the whole controllable of biological printing process, satisfies the demand of biological printing better.

Description

Double-nozzle 3D printer

Technical Field

The utility model belongs to the technical field of the 3D printing technique and specifically relates to a dual spray 3D printer is related to.

Background

In recent years, tissue engineering technology and biological 3D printing technology are becoming a new generation of cartilage repair technology. The 3D printing technology can accurately control the internal structure of the stent, construct a morphological structure similar to cartilage, and simultaneously control the internal pore size to realize customization according to cartilage defects. The biological 3D printing technology can also be used for testing cell-containing printing or active cytokine printing, and provides a new direction for transplanting plants in the construction body and the like. Hydrogel as a material most used for deposition printing has many advantages such as a structure similar to human soft tissue, a large amount of water content, good biocompatibility and the like, and in recent years, many advances have been made in biological 3D printing based on hydrogel.

The existing extrusion type hydrogel 3D printing is to finish three-dimensional construction of a tissue structure by depending on the fluidity of hydrogel, so that the rheological property of a hydrogel material is an important parameter for hydrogel cell biological 3D printing, the control on the flow rate of the hydrogel in the printing process, the diameter of a gel strip extruded by a nozzle, the structural design and printing precision of a printing gel bracket, the influence of shearing force generated by the extrusion of the hydrogel on the cell activity and the like are all related to the rheological property of the hydrogel. In printing technologies with hydrogels, first, the selection of a suitable hydrogel material is a first consideration in bioprinting. The hydrogel material in bioprinting is used as a carrier of cells, provides a suitable living environment for the cells, and simultaneously must protect the activity of the cells from being influenced by a printing process and have certain mechanical strength to maintain the integrity of the geometric outline of a printing structure. The biological printing breaks through the technical bottleneck of the traditional tissue engineering technology, directly takes the cells as a part of biological printing ink, realizes continuous construction, uniform transition and seamless connection of all layers of the bracket by a printing mode of layer-by-layer accumulation from bottom to top, and realizes accurate space positioning of the cells and biological materials. Second, bioprinting enables seamless construction of complex multilayer structures. Before the bioprinting technology is emerged, technologies such as electrospinning, mixed construction and layered splicing are used for trying to construct a tissue engineering structure with the characteristic of uneven cell distribution, however, the technologies still enable cells to randomly enter the interior of the stent through micropores on the surface of the stent, the total amount of the cells in the stent cannot be controlled quantitatively, the spatial position of the cells in the stent is influenced by various factors, and the cells can migrate among different pores. Experiments show that micropores with different sizes of the gradient pore diameter scaffold can generate different cell biological influences, while a multilayer splicing scaffold can form an obvious interlayer interface and is not suitable for constructing a thin-layer tissue with a complex multilayer structure. The biological printing technology adopts a unique construction mode of accumulating layer by layer from bottom to top, and continuous construction, uniform transition and seamless connection of each layer are realized in the process of printing the support. Thirdly, the biological printing technology does not need to prepare special processing molds and tools, the time of the bracket manufacturing process is short, and the method is more suitable for individual bracket construction and is more suitable for clinical restoration needs. Articular cartilage has a physiological curve radian, cartilage defects needing to be repaired in clinic have various shapes, a three-dimensional model of a defect part is established by a bioprinting technology according to medical imaging data, and the production of the individualized scaffold can be realized in a short time under the condition of having biological materials and cells. It is difficult to imagine that the construction of the individualized stent with special anatomical morphology can be realized by using traditional methods such as die casting.

There are also many proposals to solve more or less technical defects among the prior art, as patent CN202020296147.0 provides a biological 3D printer for improving the repair of AMIC technology cartilage, including the fuselage frame, the fuselage frame top is close to rear position fixedly connected with backplate, backplate fixedly connected with fixed bolster, the spout has been seted up on the fixed bolster surface, the fixed bolster surface is equipped with the shaping platform, and shaping platform and fixed bolster surface spout sliding connection, fuselage frame top central point fixedly connected with stripping off device, the stripping off device top is equipped with containing device, and containing device offsets with stripping off device, stripping off device top fixedly connected with feed supplement device, use three precision adjustment device to utilize three point plane principle to realize the regulation to the initial height and the levelness of shaping plane through the shaping platform, thereby improve the printing precision, the high accuracy projection of DLP projection optical machine solidifies the bio-ink, make the shaping precision can reach tens of microns, and can be used for printing extremely complicated molding. And patent CN201510143867.7 discloses a cartilage repair system based on 3D printing technology, which comprises a 3D printing system and a feeding system, wherein the 3D printing system comprises a printing nozzle and a nozzle moving rod with multiple degrees of freedom, and a radial rotating structure capable of enabling the printing nozzle to radially rotate 360 degrees around the moving rod shaft is arranged between the printing nozzle and the nozzle moving rod. The scanner with multiple degrees of freedom and the printing nozzle can carry out all-dimensional scanning and printing in the lesion cavity of the defective cartilage, can realize the quick and accurate repair of the focal cartilage defect, can greatly reduce the wound and shorten the treatment time. However, the above patent does not completely solve the problems of stable, controllable and rapid forming of the printing process. With the continuous development of the bio-printing technology and the optimized design of the printing platform, the bio-printing technology enters an operating room from a laboratory finally, tissues and organs are regenerated on site, and in-situ repair becomes another powerful means for modern medical treatment.

Therefore, this application provides a dual spray 3D printer, realizes the even running of printing process and the whole controllable of biological printing process to satisfy the demand that biological printing better.

SUMMERY OF THE UTILITY MODEL

In order to achieve the above purpose, the present application provides the following technical solutions:

a double-nozzle 3D printer comprises a three-axis printing platform, wherein a loading plate is mounted on the three-axis printing platform, and a multi-type material storage mechanism and an extrusion head are mounted on the front surface of the loading plate;

the multi-type material storage mechanism is connected with the discharging power set and is provided with at least two discharging holes;

the extrusion head is communicated with the discharge port of the double-material storage mechanism and is a single extrusion port.

Preferably, the multi-material storage mechanism comprises a fixing box and a plurality of piston storage units, the fixing box is fixed on the loading plate, the piston storage units are arranged in the fixing box, the piston storage units are provided with at least one discharge hole, and piston parts of the piston storage units are controlled by the discharge power set.

Preferably, the piston storage unit is a screw injector.

Preferably, the emptying power unit comprises an air pump, a control box integrated with the air pressure valve, and an air duct, wherein the air pump is communicated with the air pressure valve of the control box through the air duct.

Preferably, the number of the air valves of the control box is two, and the two air valves are respectively communicated with the tail ends of the two piston storage units through air ducts; the control box is electrically connected with an electric control system of the three-axis printing platform.

Preferably, the extrusion head comprises a multi-way pipe, a throat pipe, a heating block, a heat dissipation block, a heat sensing unit and a nozzle, wherein the inlet end of the multi-way pipe is communicated with the outlet end of the piston storage unit, the outlet end of the multi-way pipe is communicated with one end of the throat pipe, the heating block and the heat dissipation block are arranged on the outer wall of the throat pipe, and the nozzle is fixed at the other end of the throat pipe; the thermal sensing unit is in contact with the throat pipe and is electrically connected with the heating block to an electric control system of the three-axis printing platform respectively.

Preferably, the nozzle is a flat-head needle.

Preferably, the radiating block comprises a sleeve and a plurality of fins on the outer wall of the sleeve, the plurality of fins are distributed along the length of the sleeve, and the sleeve is sleeved on the throat pipe.

Preferably, the heat induction unit is inserted into a pre-hole on the heating block, and the throat is exposed to the pre-hole.

The application comprises at least one of the following beneficial technical effects:

1) This printer is applicable to the biological aquogel printing material of intensive mixing through the ejection of compact mode of advancing one more, and produces high-pressure air with the air pump of pneumatic extrusion mechanism and promote the aquogel to valve control gas switch, overall structure is simple, and it is outstanding with the controllability to operate steadily, makes the whole controllable of biological printing process, satisfies the demand of biological printing better.

2) This printer has heat radiation module and constant temperature heating module, can maintain special material 3D and print required constant temperature technological condition to the material heating of printing, guarantees to print the effect.

3) The printer adopts a double-nozzle design, and is suitable for 3D printing of common single-component materials and quick printing of multi-component composite biological materials.

4) Two feed inlets are respectively arranged on the left and the right of the double-nozzle, the feeding speed can be respectively controlled through the air pressure adjusting device, the materials with two different types and proportions can be uniformly mixed, and the materials can be quickly condensed and formed after being printed.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following descriptions are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

Fig. 1 is a schematic view of an overall structure of a dual-nozzle 3D printer according to the present invention;

fig. 2 is a schematic structural diagram of a multi-type material storage mechanism in the dual-nozzle 3D printer according to the present invention;

fig. 3 is a schematic structural diagram of an extrusion head in the dual-nozzle 3D printer according to the present invention;

description of the reference numerals: 1. a three-axis printing platform; 2. a loading plate; 3. a multi-type material storage mechanism; 31. a fixing box; 32. A piston storage unit; 4. an extrusion head; 41. a multi-pass tube; 42. a throat; 43. a heating block; 44. a heat dissipating block; 45. a heat sensing unit; 46. a nozzle; 51. an air pump; 52. and a control box.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. In the following description, specific details such as specific configurations and components are provided only to facilitate a thorough understanding of embodiments of the present application. Accordingly, it will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present application. In addition, descriptions of well-known functions and constructions are omitted in the embodiments for clarity and conciseness.

It should be appreciated that reference throughout this specification to "one embodiment" or "the embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrase "one embodiment" or "the present embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

Further, the present application may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.

The term "and/or" herein is merely an association relationship describing an associated object, and means that there may be three relationships, for example, a and/or B, which may mean: a exists alone, B exists alone, and A and B exist at the same time, and the term "/and" is used herein to describe another association object relationship, which means that two relationships may exist, for example, A/and B, may mean: a alone, and both a and B alone, and further, the character "/" in this document generally means that the former and latter associated objects are in an "or" relationship.

The term "at least one" herein is merely an association relationship describing an associated object, and means that there may be three relationships, for example, at least one of a and B, may mean: a exists alone, A and B exist simultaneously, and B exists alone.

It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion.

Example 1

The embodiment of the application discloses structural scheme of double spray 3D printer.

Referring to fig. 1, fig. 1 is an overall structure schematic diagram of a dual-nozzle 3D printer according to the present invention. A dual head 3D printer comprising: triaxial print platform 1, triaxial print platform 1 realizes the triaxial platform of X, Y, Z axle motion with linear guide slip table module promptly. Install loading plate 2 on the linear guide slip table module of triaxial print platform 1's X axle, the front of loading plate 2 is installed multiclass material storage mechanism 3 and is extruded head 4.

It can be understood that the three-axis printing platform 1 is at least provided with an electric control system for controlling the stepping motor/servo motor of the sliding table module, so as to realize automatic three-axis movement.

Load board 2 with the bolt fastening on the linear guide slip table module of the X axle of triaxial print platform 1, specifically as the front of long slider. In one embodiment, the loading plate 2 can also be replaced by a long slide, when the area of the long slide is sufficient.

The multi-material storage mechanism 3 is connected with a discharging power set, the discharging power set is used for driving the internal materials to be sent out, and the multi-material storage mechanism 3 is provided with at least two discharge ports. Extrude head 4 and communicate in two storage mechanism's discharge gate, should extrude head 4 and extrude the mouth for singly extruding.

The emptying power unit comprises an air pump 51, a control box 52 for integrally installing an air valve and a ventilation pipeline; the air pump 51 is used as an air source and is communicated with the two air pressure valves of the control box 52 through air ducts, and the two air pressure valves are respectively communicated with the tail ends of the two piston storage units 32 through the air ducts to push the pistons of the screw injectors so as to send out materials in the pistons. Preferably, the pneumatic valves can control the flow rate individually; the working pressure of the air pump is 0.1-0.6Mpa.

It is understood that the control box 52 is electrically connected to the electrical control system of the three-axis printing platform 1. The air pump with pneumatic extrusion mechanism produces high-pressure air and promotes aquogel to valve control gas switch, overall structure is simple, and it is outstanding with the controllability to operate steadily for the whole journey of biological printing process is controllable, satisfies the demand that biological printing better.

Example 2

The embodiment further illustrates the structure of the multi-type material storage mechanism in the dual-nozzle 3D printer according to the present application based on the scheme of the above embodiment.

In the present embodiment, the multi-material storage mechanism 3 is exemplified by two materials, and therefore the following related structures thereof are the same.

Referring to fig. 2, fig. 2 is a structural schematic diagram of a multiclass material storage mechanism in dual spray 3D printer. The multiple-type material storage mechanism 3 includes: a fixed case 31 and two piston storage units 32. Wherein, the fixing box 31 is fixed on the front surface of the loading plate 2 by bolts; the piston storage unit 32 is vertically inserted into the fixing box 31, and in this embodiment, the piston storage unit 32 is a screw injector. It will be appreciated that the plunger rod of the screw injector is truncated to avoid interference with the connection of the dispensing power pack.

The screw injector is selected in this embodiment because in the application environment of this application, in order to guarantee health safety etc., the screw injector is directly regarded as the consumptive material, rather than the structure of reuse.

Example 3

This example further illustrates the structure of the extrusion head in the dual-nozzle 3D printer described in this application based on the scheme of example 1.

Referring to fig. 3, fig. 3 is a schematic structural diagram of an extrusion head in a dual-nozzle 3D printer. The material from the piston storage unit 32 enters the extrusion head 4 and is extruded from the nozzle 46 for 3D printing.

The extrusion head 4 includes: a multi-way tube 41, a throat 42, a heating block 43 (such as a metal block with a built-in PTC element), a heat dissipating block 44, a heat sensing unit 45 and a nozzle 46.

In one embodiment, the extrusion head further comprises an extrusion cassette secured to the front face of the loading plate 2 and located below the multiple-type storage mechanism 3, serving as other structure for receiving the integrated extrusion head 4.

Preferably, the nozzle length is 0.5-2cm. Preferably, the outlet diameter of the nozzle 46 is 0.1-0.6mm.

The multi-way pipe 41 is a three-way pipe and is connected with the extrusion box, and the left and right ports of the multi-way pipe 41 are inlets and are communicated with the outlet end of the piston storage unit 32 through a pipeline; the lower end of the multi-way pipe 41 is an outlet and is fixed with one end of the throat 42 by a flange structure. The throat pipe 42 is vertically arranged, the heat dissipation block 44 and the heating block 43 are sequentially fixed outside the throat pipe 42 from top to bottom, and the heat dissipation block 44 and the heating block 43 are mutually separated from the lower end of the throat pipe 42 to form a connector end matched with the nozzle 46.

Preferably, the nozzle 46 is selected in this embodiment as a flat-head needle and is removably attached to the lower end of the throat 42.

The heat dissipation block 44 includes a sleeve and a plurality of fins on the outer wall of the sleeve, the plurality of fins are distributed along the length of the sleeve, and the sleeve is sleeved on the throat 42 and is welded and fixed. The upper and lower parts of the heating block 43 are provided with nuts which are in threaded connection with the throat 42 to realize the fixation thereof. A transverse pre-opening is formed in the heating block 43 and the throat 42 is exposed to the pre-opening.

The thermal sensing unit 45 is inserted into the pre-opening hole and locked by the front and rear nuts.

It should be noted that the heating block 43 is designed to be detachable because the heating unit has a certain probability of damage during use, and the detachable structure is designed to facilitate replacement of parts.

It will be appreciated that the heating block 43 and the thermal sensing unit 45 are each electrically connected to the electrical control system of the three-axis printing platform for control.

In accordance with the above, the material passes through the throat 42 before being delivered from the nozzle 46. In one embodiment, the heating module sleeved outside the throat tube 42 can heat the material of the throat tube 42, maintain a constant temperature environment required by 3D printing, and ensure a printing effect.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims (6)

1. The utility model provides a dual spray 3D printer which characterized in that: the three-axis printing device comprises a three-axis printing platform (1), wherein a loading plate (2) is arranged on the three-axis printing platform (1), and a multi-type material storage mechanism (3) and an extrusion head (4) are arranged on the front surface of the loading plate (2);

the multi-type material storage mechanism (3) is connected with the discharging power set and is provided with at least two discharging ports;

the extrusion head (4) is communicated with a discharge hole of the material storage mechanism and is a single extrusion hole;

the extrusion head (4) comprises a multi-way pipe (41), a throat pipe (42), a heating block (43), a heat dissipation block (44), a heat induction unit (45) and a nozzle (46);

the nozzle (46) is a flat-head needle head, and the diameter of an outlet of the nozzle (46) is 0.1-0.6mm;

the multi-material storage mechanism (3) comprises a fixed box (31) and a plurality of piston storage units (32), the fixed box (31) is fixed on the loading plate (2), the piston storage units (32) are installed on the fixed box (31), the piston storage units (32) are provided with at least one discharge hole, and piston parts of the piston storage units are controlled by a discharge power set;

the inlet end of the multi-way pipe (41) is communicated with the outlet end of the piston storage unit (32), and the outlet end of the multi-way pipe (41) is communicated with one end of the throat pipe (42);

the outer wall of the throat pipe (42) is provided with a heating block (43) and a heat dissipation block (44), and the other end of the throat pipe is fixed with a nozzle (46);

the thermal sensing unit (45) is in contact with the throat pipe (42) and is electrically connected with the heating block (43) through an electric control system of the three-axis printing platform (1).

2. The dual head 3D printer of claim 1, wherein: the piston storage unit (32) is a screw injector.

3. The dual head 3D printer of claim 1, wherein: the radiating block (44) comprises a sleeve and a plurality of fins on the outer wall of the sleeve, the fins are distributed along the length of the sleeve, and the sleeve is sleeved on the throat pipe (42).

4. The dual head 3D printer of claim 1, wherein: the heat induction unit (45) is inserted into a pre-opening hole in the heating block (43), and the throat (42) is exposed to the pre-opening hole.

5. The dual head 3D printer of claim 1, wherein: the emptying power unit comprises an air pump (51), a control box (52) for integrally installing an air pressure valve and an air duct, wherein the air pump (51) is communicated with the air pressure valve of the control box (52) through the air duct.

6. The dual head 3D printer of claim 5, wherein: and two air valves of the control box (52) are respectively communicated with the tail ends of the two piston storage units (32) through air ducts.

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