阅读说明：本技术 一种用于3d打印的定量混料输送装置 (A quantitative compounding conveyor for 3D prints ) 是由 龙海明 郝俊杰 郭志猛 王海英 裴广林 于 2020-12-14 设计创作，主要内容包括：本发明涉及一种用于3D打印的定量混料输送装置,包括：混合送料器、混料输料导管、针头式挤出喷嘴；混合送料器包括：混合送料壳体、密封垫片、混合送料螺杆、混合送料电机、进料口、定量送料机壳体、定量送料螺杆、定量送料电机、混合器底盘；混料输料导管包括：导管接头、输料导管、输料弹簧；针头式挤出喷嘴包括：连接机构、挤出螺旋、打印针头、挤出头、密封垫片、对接法兰。本发明解决了制造过程中送料挤出不稳定、料浆固液分离、浆料输送过程堵塞的问题,可实现长时间连续稳定的3D打印,变组分、多组分料浆的定量输入,可实现变组分、多组分材料、梯度材料打印,整体结构简化。(The invention relates to a quantitative mixing and conveying device for 3D printing, which comprises: a mixing feeder, a mixing and conveying conduit and a needle head type extrusion nozzle; the mixing feeder includes: the device comprises a mixing feeding shell, a sealing gasket, a mixing feeding screw, a mixing feeding motor, a feeding port, a quantitative feeding shell, a quantitative feeding screw, a quantitative feeding motor and a mixer chassis; defeated material pipe of compounding includes: the device comprises a guide pipe joint, a material conveying guide pipe and a material conveying spring; the needle-type extrusion nozzle includes: coupling mechanism, extrusion spiral, printing syringe needle, extrude head, seal gasket, butt flange. The invention solves the problems of unstable feeding extrusion, solid-liquid separation of slurry and blockage in the slurry conveying process in the manufacturing process, can realize long-time continuous and stable 3D printing, quantitative input of variable-component and multi-component slurry, and printing of variable-component, multi-component and gradient materials, and has simplified integral structure.)

1. The utility model provides a ration compounding conveyor for 3D prints which characterized in that includes: a mixing feeder (1), a mixing and conveying conduit (2) and a needle head type extrusion nozzle (3); the mixing feeder (1) comprises: the device comprises a mixing feeding shell (4), a sealing gasket (5), a mixing feeding screw (6), a mixing feeding motor (7), a feeding hole (8), a quantitative feeding shell (9), a quantitative feeding screw (10), a quantitative feeding motor (11) and a mixer chassis (12); compounding defeated material pipe (2) include: a guide pipe joint (13), a material conveying guide pipe (14) and a material conveying spring (15); the needle-type extrusion nozzle (3) comprises: the device comprises a connecting mechanism (16), an extrusion screw (17), a printing needle head (18), an extrusion head (19), a sealing gasket (5) and a butt flange (20), wherein a mixing feeder (1) is connected with a mixing and conveying conduit (2), and the mixing and conveying conduit (2) is connected with a needle head type extrusion nozzle (3); a sealing gasket (5) is arranged between the mixing feeding shell (4) and the mixing feeding motor (7), the mixing feeding screw (6) is arranged in the mixing feeding shell (4), the mixing feeding screw (6) is connected with the mixing feeding motor (7) in a fixed connection mode, the feeding port (8) is arranged above the quantitative feeding shell (9), the quantitative feeding shell (9) is connected with the mixing feeding shell (4), the quantitative feeding screw (10) is arranged in the quantitative feeding shell (9), and the mixing feeding screw (6) is connected with the quantitative feeding motor (11) in a fixed connection mode; defeated material pipe (14) extrude nozzle (3) with mixed feeder (1) and syringe needle formula respectively through pipe joint (13) and be connected, defeated material spring (15) are connected with mixed pay-off screw rod (6), defeated material spring (15) are connected with extrusion spiral (17) through coupling mechanism (16), extrude spiral (17) and install printing syringe needle (18) and extrude the inside of head (19), printing syringe needle (18) with extrude head (19) and be connected, it is connected and is equipped with seal gasket (5) between being connected and to extrude head (19) and flange (20).

2. A quantitative compounding conveyor for 3D printing according to claim 1, wherein: mix pay-off casing (4), mix pay-off screw rod (6), ration pay-off casing (9), ration pay-off screw rod (10), blender chassis (12), extrude spiral (17), printing needle (18), extrude first (19), the material of flange (20) includes: stainless steel.

3. A quantitative compounding conveyor for 3D printing according to claim 1, wherein: the material conveying spring (15) is a hollow flexible spring.

4. A quantitative compounding conveyor for 3D printing according to claim 1, wherein: the sealing gasket (5) is made of the following materials: a fluororubber.

5. A quantitative compounding conveyor for 3D printing according to claim 1, wherein: the fixed connection mode comprises: bearing, welding and clamping.

6. A quantitative compounding conveyor for 3D printing according to claim 1, wherein: the material of the material conveying guide pipe (14) comprises: PE, nylon, PU.

7. A quantitative compounding conveyor for 3D printing according to claim 1, wherein: the material spring is the flexible spring of cavity, and the material includes: 60 CrMnBA.

8. A quantitative compounding conveyor for 3D printing according to claim 1, wherein: the connection mechanism (16) includes: tin welding and epoxy resin AB glue.

Technical Field

The invention relates to the field of 3D printing, in particular to a quantitative mixing and conveying device for 3D printing.

Background

The 3D printing technique, also known as Additive Manufacturing (AM), belongs to a rapid prototyping technique (RP) that builds a three-dimensional object by printing and superimposing successive layers of different shapes layer by layer on the basis of a built digital model file using bondable materials such as powdered metal, ceramic, or polymer materials. The greatest advantage of 3D printing compared to conventional casting processes is the ability to freely manufacture complex parts directly from stock, without the need to involve conventional manufacturing methods such as extrusion, forging, casting and secondary machining to obtain the desired shape, and the utilization of stock is nearly 100%.

The printing method based on the material extrusion type is typically a Fused Deposition Modeling (FDM), which is an abbreviation of "Fused Deposition Modeling" and is a method of heating and melting various kinds of filament materials (e.g., engineering plastics ABS, polycarbonate PC, etc.) and then performing build-up molding. Based on the FDM principle, 3D printing techniques for ceramics and metals have been developed. Namely, ceramic or metal slurry (semi-solid slurry with certain fluidity prepared by ceramic or metal powder, solvent, binder and the like) is used, and the working principle of the ceramic and metal FDM is as follows: the heating extrusion mechanism and the spray head (needle head) do X-Y plane movement under the control of a computer according to the section profile information of the product part, the slurry is sent to the extrusion spray head (needle head) through the conveying and extrusion mechanism and extruded out, the slurry is selectively coated on a workbench, and a layer of thin sheet profile is formed after the slurry is rapidly solidified. And after the section of one layer is formed, the workbench descends by a certain height, then the next layer is deposited as if the section outline is drawn layer by layer, and the steps are repeated so as to finally form the three-dimensional product part.

The ceramic or metal feeding device based on FDM technology is generally screw extrusion type or air pressure extrusion type. The slurry is pushed by a rotating screw with a screw and sent to a spray head in a screw extrusion mode. The screw charging barrel is small and the amount of paste available for printing at a time is limited. If feeding is required, the screw extruder is typically connected to a feed barrel by a hose, and the slurry flows into the extruder by gravity, depending on the difference in height between the barrel and the extruder. The transportation is difficult when the hose is thin or the slurry has high viscosity and high solid content. The pneumatic piston extrusion type is similar to the injection principle of an injector, and only the pushing force is replaced by compressed gas. The feeding and extrusion in this way are regulated and controlled by the pressure of compressed gas, which is not very stable, the slurry is easy to separate solid and liquid, and the volume of the air pressure extrusion barrel is limited, so that the continuous printing can not be carried out for a long time. Therefore, for the FDM additive manufacturing process of ceramics and metals, a feeding and extruding mechanism which can stably convey, stably extrude and continuously print for a long time is urgently needed.

Disclosure of Invention

The invention aims to provide a quantitative mixing and conveying device for 3D printing, which aims to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a quantitative compounding conveyor for 3D prints includes: a mixing feeder, a mixing and conveying conduit and a needle head type extrusion nozzle; the mixing feeder includes: the device comprises a mixing feeding shell, a sealing gasket, a mixing feeding screw, a mixing feeding motor, a feeding port, a quantitative feeding shell, a quantitative feeding screw, a quantitative feeding motor and a mixer chassis; defeated material pipe of compounding includes: the device comprises a guide pipe joint, a material conveying guide pipe and a material conveying spring; the needle-type extrusion nozzle includes: coupling mechanism, extrusion spiral, printing syringe needle, extrude head, seal gasket, butt flange. The mixing feeder is connected with a mixing and conveying guide pipe, and the mixing and conveying guide pipe is connected with a needle head type extrusion nozzle; a sealing gasket is arranged between the mixed feeding shell and the mixed feeding motor, the mixed feeding screw is arranged in the mixed feeding shell and is connected with the mixed feeding motor in a fixed connection mode, the feeding hole is arranged above the quantitative feeding machine shell, the quantitative feeding machine shell is connected with the mixed feeding shell, the quantitative feeding screw is arranged in the quantitative feeding machine shell, and the mixed feeding screw is connected with the quantitative feeding motor in a fixed connection mode; defeated material pipe passes through pipe joint and extrudes the nozzle with mixing feeder and syringe needle formula respectively and is connected, defeated material spring is connected with mixing the pay-off screw rod, defeated material spring passes through coupling mechanism and extrudes the screw connection, extrude the spiral and install printing the syringe needle and extrude the inside of head, printing the syringe needle and extrude the head and be connected, extrude head and flange joint and be equipped with seal gasket between just.

Wherein, mix pay-off casing, mix pay-off screw rod, ration feeder casing, ration pay-off screw rod, blender chassis, extrude spiral, printing syringe needle, extrude head, flange's material includes: stainless steel.

Wherein, a clearance is reserved between the helical blade of the mixing and feeding screw and the shaft, the effects of stirring and uniformly mixing slurry and propelling and conveying are achieved, and the material conveying spring is driven to rotate.

Wherein, the sealing gasket plays the sealed effect.

Wherein, the material of seal gasket includes: a fluororubber.

Wherein, the fixed connection mode includes: bearing, welding and clamping.

The mixer feeding motor and the quantitative feeding motor use stepping motors, and the rotating speeds of the screw rods and the material conveying springs can be stably adjusted, so that stable stirring feeding and extrusion are achieved.

Wherein, defeated material pipe is plastic hose, plays to connect and mixes feeder and syringe needle formula extrusion nozzle, carries the effect of ground paste, and the material includes: PE, nylon, PU.

The material conveying spring is a hollow flexible spring, has the function of conveying slurry, also has the function of stirring and uniformly mixing, can effectively convey the slurry, and prevents the slurry from being subjected to solid-liquid separation and blockage in the material conveying guide pipe. The spring is elastic material, and is buckled with the hose cooperation and flexibility and does not influence the ground paste and carry, and the material includes: 60 CrMnBA.

Wherein the conduit joint is a butt joint interface with the mixing feeder and the needle head type extrusion nozzle

The printing needle head is a final slurry outlet, and the extruding speed of the slurry can be controlled by selecting different outlet diameters of the printing needle head and extruding spiral parameters and linking with a 3D printer program.

The extrusion screw is one of extrusion power of the slurry in the extrusion head and the printing needle head, and the extrusion screw rotates at a certain speed to drive the slurry to be extruded from the needle head.

Wherein the connecting mechanism comprises: tin welding and epoxy resin AB glue.

The butt flange is a reserved interface for butt joint of the needle head type extrusion nozzle and the 3D printer.

Compared with the prior art, the invention has the following beneficial effects:

1. the material conveying guide pipe with the hollow spring is used, so that the problem that the feeding and the extrusion are unstable in the material increase manufacturing process of the FDM method is solved; the problem of slurry solid-liquid separation in the material increase manufacturing process of the FDM method is solved; the problem of blockage in the slurry conveying process during the butt joint of an FDM method additive manufacturing and a feeding device is solved;

2. a feeding device can be added to the reserved butt joint, so that a long-time continuous and stable 3D printing process is realized;

3. the quantitative input, mixing, homogenizing and conveying of the variable-component and multi-component slurry can be realized by using the quantitative mixing and feeding mechanism; the mixing and conveying mechanism is matched with the extrusion printing mechanism, so that the printing of variable-component, multi-component and gradient materials can be realized.

4. Compared with other extrusion nozzle mechanisms, the structure of the extrusion nozzle is simplified by using the needle head type extrusion nozzle, and the printer only occupies the space of one needle head.

Drawings

FIG. 1 is an overall view of the quantitative mixing and conveying apparatus according to the present invention;

FIG. 2 is a planer view of the mixing feeder of the present invention;

FIG. 3 is a top view of the mixing feeder of the present invention;

FIG. 4 is a view of the entire mixing and feeding duct of the present invention;

FIG. 5 is a planer view of the needle-type extrusion nozzle of the present invention;

wherein: 1-mixing feeder, 2-mixing material conveying conduit, 3-needle type extrusion nozzle, 4-mixing feeding shell, 5-sealing gasket, 6-mixing feeding screw, 7-mixing feeding motor, 8-feeding inlet, 9-quantifying feeding shell, 10-quantifying feeding screw, 11-quantifying feeding motor, 12-mixer chassis, 13-conduit joint, 14-conveying conduit, 15-conveying spring, 16-connecting mechanism, 17-extrusion screw, 18-printing needle, 19-extrusion head and 20-butt flange.

Detailed Description

So that the manner in which the features and aspects of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings.

Referring to fig. 1-5, a quantitative compounding conveyor for 3D printing, comprising: a mixing feeder 1, a mixing and conveying conduit 2 and a needle head type extrusion nozzle 3; the mixing feeder 1 includes: the device comprises a mixing feeding shell 4, a sealing gasket 5, a mixing feeding screw 6, a mixing feeding motor 7, a feeding hole 8, a quantitative feeding machine shell 9, a quantitative feeding screw 10, a quantitative feeding motor 11 and a mixer chassis 12; defeated material pipe 2 of compounding includes: a conduit joint 13, a material conveying conduit 14 and a material conveying spring 15; the needle-head-type extrusion nozzle 3 includes: a connecting mechanism 16, an extrusion screw 17, a printing needle 18, an extrusion head 19, a sealing gasket 5 and a butt flange 20. The mixing feeder 1 is connected with a mixing and conveying conduit 2, and the mixing and conveying conduit 2 is connected with a needle head type extrusion nozzle 3; a sealing gasket 5 is arranged between the mixed feeding shell 4 and the mixed feeding motor 7, the mixed feeding screw 6 is arranged in the mixed feeding shell 4, the mixed feeding screw 6 is connected with the mixed feeding motor 7 in a fixed connection mode, the feeding hole 8 is arranged above the quantitative feeding machine shell 9, the quantitative feeding machine shell 9 is connected with the mixed feeding shell 4, the quantitative feeding screw 10 is arranged in the quantitative feeding machine shell 9, and the mixed feeding screw 6 is connected with the quantitative feeding motor 11 in a fixed connection mode; defeated material pipe 14 is connected with mixed feeder 1 and syringe needle formula extrusion nozzle 3 respectively through pipe joint 13, defeated material spring 15 is connected with mixed pay-off screw rod 6, defeated material spring 15 is connected with extrusion spiral 17 through coupling mechanism 16, extrusion spiral 17 installs in printing syringe needle 18 and extrudes the inside of head 19, printing syringe needle 18 with extrude the head 19 and be connected, it is connected and is equipped with seal gasket 5 between head 19 and the flange 20 to extrude.

The invention is based on the principle of spiral feeding, spiral stirring and spiral extrusion. A quantitative feed screw 10 having a screw blade tightly connected to a shaft is used as a quantitative feed power source to quantitatively feed slurry and powder particles into the mixing feeder 1. A compounding conveying screw having a screw blade with a gap with a shaft was used as a compounding stirring and a power source of the slurry from the mixing feeder 1 to the extrusion nozzle. The use of a spring and a hose as a driving means for slurry conveyance enables stable conveyance of the slurry from the mixer feeder 1 to the extrusion nozzle. The conveying conduit 14 can carry out secondary stirring and uniform mixing on the powder in the hose while conveying the slurry and the powder. The screw of the mixing feeder 1 drives the hollow spring to rotate, and the rotating hollow spring provides pressure for the slurry, so that the slurry is transferred in the conveying guide pipe 14 and is extruded out of the printing needle 18, and the printing process is realized.

The mixing and feeding shell 4, the mixing and feeding screw 6, the quantitative feeder shell 9, the quantitative feeding screw 10, the mixer chassis 12, the extrusion screw 17, the printing needle 18, the extrusion head 19 and the butt flange 20 are made of stainless steel.

Wherein, a clearance is reserved between the helical blade of the mixing and feeding screw 6 and the shaft, the functions of stirring and uniformly mixing slurry and propelling and conveying are achieved, and the material conveying spring 15 is driven to rotate.

Wherein the sealing gasket 5 plays a sealing role.

The sealing gasket 5 is made of fluororubber.

Wherein, the specified connection mode is a bearing or welding or buckling.

The mixer feeding motor and the quantitative feeding motor 11 use stepping motors, the rotating speeds of the screw rods and the conveying springs 15 can be stably adjusted to achieve stable stirring, feeding and extruding, and a direct current 24V motor with the power of 10-200W is selected according to the size of an extruding mechanism

Wherein, the material conveying conduit 14 is a plastic hose, which is used for connecting the mixing feeder 1 and the needle type extrusion nozzle 3 and conveying slurry, and is made of PE, nylon or PU.

The material conveying spring 15 is a hollow flexible spring, has the function of conveying slurry, also has the function of stirring and uniformly mixing, can effectively convey the slurry, and prevents the slurry from being separated from solid and liquid and being blocked in the material conveying guide pipe 14. The spring is made of elastic material, is matched with the hose and is flexibly bent without influencing slurry conveying, and the material is 60 CrMnBA.

Wherein the conduit joint 13 is a butt joint interface with the mixing feeder 1 and the needle type extrusion nozzle 3

Printing needle 18 is the final export of ground paste, through the export diameter of selecting for use different printing needle 18 and extrude spiral 17 parameter to and link with 3D printer program, the extrusion speed of steerable ground paste, needle outlet diameter 0.5~2 mm.

The extrusion screw 17 is one of extrusion power of the slurry in the extrusion head 19 and the printing needle 18, and the extrusion screw 17 rotates at a certain speed to drive the slurry to be extruded from the needle.

Wherein, the manufacturing process of the extrusion screw 17 comprises 2 types. Firstly, a spiral hollow spring corresponding to the diameter of the needle head is used, for example, the diameter of the needle head is phi 1.5mm, the outer diameter of the hollow spring is phi 1.2mm, and the inner diameter is phi 0.8mm (the metal wire with the wire diameter of phi 0.2mm is used for winding). One is to use a fine thread bit (bit minus the unthreaded part) corresponding to the diameter of the needle, e.g., 1.0mm diameter of the needle, 0.8mm diameter of the thread bit.

Wherein the connecting mechanism 16 is a tin solder or an epoxy AB glue.

The butt flange 20 is a reserved interface for butt joint of the needle type extrusion nozzle 3 and the 3D printer.

It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.