CN112743845B

CN112743845B - 3D prints extrusion device and has its 3D printer

Info

Publication number: CN112743845B
Application number: CN202011595426.8A
Authority: CN
Inventors: 刘辉林; 唐京科; 陈春; 敖丹军; 吴大江
Original assignee: Shenzhen Chuangxiang 3D Technology Co Ltd
Current assignee: Shenzhen Chuangxiang 3D Technology Co Ltd
Priority date: 2020-12-29
Filing date: 2020-12-29
Publication date: 2022-11-11
Anticipated expiration: 2040-12-29
Also published as: CN112743845A

Abstract

A3D printing extrusion device and a 3D printer with the same are used for extruding consumables and comprise a shell and a driving mechanism, wherein the driving mechanism is arranged in the shell; the actuating mechanism drives the screw assembly to rotate around the extrusion direction of the consumptive material, be used for extruding the consumptive material from the feed end of screw assembly to the discharge end of screw assembly or extracting the consumptive material from the discharge end screw assembly to the feed end screw assembly, adopt a plurality of modes of extruding the screw rod around the extrusion direction revolution of consumptive material, extrude or extract along the pay-off direction with driven consumptive material with it, make printing in-process do not have during the crushed aggregates fall into the shower nozzle, the printing quality problem because of the crushed aggregates causes has been stopped, guarantee the stability of pay-off.

Description

3D prints extrusion device and has its 3D printer

Technical Field

The application relates to the field of 3D printing, in particular to a 3D printing extrusion device and a 3D printer with the same.

Background

The stability of the extruder plays a vital role in the printing quality and stability of the 3D printer, the traditional extruder has a single-tooth drive mode and a double-tooth drive mode, the common point of the two modes is that the hobbing is circular and is in transverse line contact with printing consumables, the friction force is limited to a certain extent, if the spring pre-pressure is simply increased, the risk of material planing and material breaking is brought, and the uncertainty of the printing process is increased.

Disclosure of Invention

In view of this, it is necessary to provide a 3D printing extrusion device and a 3D printer having the same, which can avoid material planing and material breaking, and improve the stability of extrusion feeding.

The application provides a 3D printing extrusion device on one hand, which is used for extruding consumables and comprises a shell and a driving mechanism, wherein the driving mechanism is arranged in the shell, the 3D printing extrusion device also comprises a screw component, the screw component comprises a plurality of extrusion screws, the screw component is arranged in the shell and connected to the driving mechanism, the consumables are clamped among the extrusion screws, and the axis of each extrusion screw is obliquely arranged relative to the extrusion direction of the consumables; the driving mechanism drives the screw rod assembly to rotate around the extrusion direction of the consumable materials, and is used for extruding the consumable materials from the feeding end of the screw rod assembly to the discharging end of the screw rod assembly or extracting the consumable materials from the discharging end screw rod assembly to the feeding end screw rod assembly.

Above-mentioned 3D prints extrusion device, compare in traditional hobbing structure extrusion mode, adopt a plurality of screw rods of extruding to revolve around the mode of the direction of extrusion of consumptive material to drive driven consumptive material with it and extrude or pumpback along the pay-off direction, solved the planer material phenomenon that traditional hobbing structure caused, and then during making the printing in-process not have the crushed aggregates to fall into the shower nozzle, stopped because of the printing quality problem that the crushed aggregates caused, guaranteed the stability of pay-off.

Furthermore, the axis of each extrusion screw is arranged at an angle with the extrusion direction of the consumable, and the distance between the obliquely arranged extrusion screws is arranged from the feed end to the discharge end from large to small.

The mode that the distance is arranged from large to small is adopted, the extrusion force is improved, the larger extrusion force can be realized under the condition of lower pre-pressure, the stable feeding can be realized under the condition of not needing larger pre-pressure, and the feeding stability is ensured.

Furthermore, the driving mechanism comprises a driving component and a transmission component, the transmission component is connected to the extrusion screw, and the driving component is in tooth connection with the transmission component to drive the transmission component to rotate relative to the shell around the extrusion direction of the consumable, so as to synchronously drive the screw component to rotate around the extrusion direction of the consumable, and further realize the revolution of the screw component.

Further, the transmission assembly comprises a driven gear, a fixing piece and a rotary support, and the driven gear is in gear joint with the driving assembly; the driven gear is connected with the rotary support through the fixing piece, and when the driven gear rotates, the rotary support synchronously rotates around a wheel axle of the driven gear; the screw assemblies are arranged on the rotary support, and each extrusion screw is respectively connected with the driven gear and the rotary support in an inclined rotation mode.

When the driving mechanism drives the driven gear to rotate, when the rotary support synchronously rotates around the wheel shaft of the driven gear, each extrusion screw rotatably mounted on the rotary support synchronously revolves around the wheel shaft, at the moment, the consumable is in contact with the extrusion screws, the extrusion screws are rotated relative to the driven gear and the rotary support by the resistance of the consumable, and generate component force in the extrusion direction, so that the consumable is pushed to extrude or withdraw along the extrusion direction, namely, the extrusion screws synchronously rotate while revolving, and the abrasion of the extrusion screws to the consumable is reduced on the basis of extruding or retracting the consumable.

Further, the drive assembly includes a driving part arranged on the housing and a driving gear connected to a rotating shaft of the driving part, the driving gear is meshed with the driven gear, so that the driving gear is driven to rotate by the driving part to drive the driven gear to rotate.

Furthermore, the driven gear and the rotary support are provided with through holes corresponding in position, the extending direction of the through holes corresponds to the position of the space between the extrusion screws, and consumables enter the feeding end of the screw assembly through the through holes in the driven gear and are extruded from the discharging end of the screw assembly through the through holes in the rotary support.

Further, in some embodiments of the present application, both ends of each of the extrusion screws are provided with screw bearings, and the screw bearings are provided on the driven gear and the rotary support, so that each of the extrusion screws is opposite to the driven gear and the rotary support.

Further, in some embodiments of the present application, the extrusion screws are disposed obliquely with respect to the driven gear, and the inclination angles of the extrusion screws are the same.

Further, in some embodiments of the present application, one end of the extrusion screw is rotatably connected to the rotary support, and the other end is disposed obliquely in a radial or circumferential direction of the driven gear.

Another aspect of the present application provides a 3D printer, which includes the 3D printing extrusion apparatus described in any one of the above embodiments, and further has the advantages described in any one of the above embodiments.

Above-mentioned 3D prints extrusion device and has its 3D printer, compare in traditional hobbing structure extrusion mode, adopt a plurality of screw rods of extruding to revolve around the mode of the extrusion direction revolution of consumptive material to drive driven consumptive material with it and extrude or pumpback along the pay-off direction, the planing material phenomenon that traditional hobbing structure caused has been solved, and then make and print the in-process and do not have during the crushed aggregates falls into the shower nozzle, stopped because of the printing quality problem that the crushed aggregates caused, guarantee the stability of pay-off.

Drawings

Fig. 1 illustrates a schematic structural diagram of a 3D printing extrusion device in an embodiment.

Fig. 2 illustrates a schematic structural diagram of a driving mechanism and a screw assembly of the 3D printing extrusion device in one embodiment.

Fig. 3 illustrates an exploded view of a drive assembly and a screw assembly of the 3D printing extrusion apparatus in one embodiment.

Fig. 4 illustrates a cross-sectional view of the 3D printing extrusion apparatus of fig. 1 along the V direction.

Fig. 5 illustrates a cross-sectional view of the 3D printing extrusion apparatus of fig. 1 along direction VI.

Description of the main elements

3D prints extrusion device 100

Housing 10

Outer casing 11

Accommodation bin 111

Upper cover 12

Drive mechanism 20

Drive assembly 21

Driving member 211

Rotating shaft 2111

Drive gear 212

Transmission assembly 22

Through hole 22a

Driven gear 221

First connecting shaft 2211

Fixing member 222

Fixing pin 222a

Rotating support 223

Second connecting shaft 2231

Gear bearing 224

Carrier bearing 225

Screw assembly 30

Feed end 30a

Discharge end 30b

Extrusion screw 31

Screw bearing 32

Heat dissipation mechanism 40

Heat sink 41

Heat radiation fan 42

Consumable 200

The following specific examples will further illustrate the application in conjunction with the above figures.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

The embodiment of the application provides a 3D printing extrusion device, which is used for extruding consumables and comprises a shell and a driving mechanism, wherein the driving mechanism is arranged in the shell; the driving mechanism drives the screw assembly to rotate around the extrusion direction of the consumable, and is used for extruding the consumable from the feed end of the screw assembly to the discharge end of the screw assembly or drawing the consumable back from the discharge end of the screw assembly to the screw assembly at the feed end.

Another aspect of the present application provides a 3D printer, which includes any one of the above 3D printing extrusion devices.

Some embodiments of the present application will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1 and 2, a 3D printing extrusion apparatus 100 for extruding a consumable 200 for 3D printing is shown. 3D prints extrusion device 100 and includes casing 10, actuating mechanism 20 and screw assembly 30 all locate in the casing 10, screw assembly 30 includes a plurality of screws 31 of extruding, consumptive material 200 centre gripping is between a plurality of screws 31 of extruding, the axis of each screw 31 of extruding is respectively for the extrusion direction slope setting of consumptive material 200, actuating mechanism 20 connects screw assembly 30, it is rotatory around the extrusion direction of consumptive material 200 to be used for the extrusion screw 31 of drive screw assembly 30, drive the consumptive material 200 motion between the extrusion screw 31 of screw assembly 30, extrude the consumptive material from the feed end of screw assembly 30 to the discharge end or with the consumptive material follow the discharge end of screw assembly 30 to the feed end pumpback. In one embodiment, the number of the extrusion screws 31 is three, and three extrusion screws 31 are arranged around the consumable 200. It is understood that the number of the extrusion screws 31 is not limited to the above limitation, and may be adjusted as desired, such as 4, 5, etc.

The shell 10 comprises a shell 11 and an upper cover 12, the driving mechanism 20 and the screw assembly 30 are accommodated in the shell 11, the upper cover 12 is arranged at the top end of the shell 11, and the consumable 200 passes through the upper cover 12, enters the shell 11 and is clamped between the screw assemblies 30. In one embodiment, the housing 11 is provided with a receiving compartment 111 for mounting a portion of the drive mechanism 20.

Referring to fig. 2, the driving mechanism 20 includes a driving component 21 and a transmission component 22, the driving component 21 is engaged with the transmission component 22 and disposed in the housing 11, the transmission component 22 is rotatably disposed in the accommodating chamber 111, and the transmission component 22 is further rotatably connected to the screw component 30. The driving assembly 21 drives the transmission assembly 22 to rotate around the extrusion direction of the consumables 200 relative to the housing 11, and further synchronously drives the screw assemblies 30 connected thereto to rotate around the extrusion direction of the consumables 200, so as to extrude or withdraw the consumables 200 between the screw assemblies 30.

The driving assembly 21 comprises a driving member 211 and a driving gear 212, the driving gear 212 is connected to a rotating shaft 2111 of the driving member 211, and a tooth part of the driving gear 212 is in tooth connection with the transmission assembly 22. The driving gear 212 is driven to rotate by the driving member 211, and the transmission assembly 22 is driven to rotate. In one embodiment, the driving member 211 is a stepping motor.

Referring to fig. 2 and 3, the transmission assembly 22 includes a driven gear 221, a plurality of fixing members 222, and a rotary support 223. The driven gear 221 is engaged with the driving gear 212, and both ends of the plurality of fixing pieces 222 are respectively connected to the driven gear 221 and the rotary support 223 to connect the driven gear 221 and the rotary support 223. The driven gear 221 and the rotary support 223 are also rotatably connected to the housing 11. The plurality of extrusion screws 31 are obliquely and rotatably connected to the driven gear 221 and the rotary support 223 and are located between the driven gear 221 and the rotary support 223. The driven gear 221 is driven to rotate by the driving member 211, so as to drive the rotating support 223 to rotate around the axle of the driven gear 221 synchronously, and further drive the plurality of extrusion screws 31 to rotate around the extrusion direction of the consumable 200 synchronously, so as to extrude or withdraw the consumable 200.

It will be appreciated that, since the extrusion screws 31 have a component force in the axial direction, there is an upward or downward component force at the locations where the plurality of extrusion screws 31 contact the consumable 200, enabling extrusion and withdrawal of the consumable 200. Specifically, when the driving member 211 drives the driven gear 221 to rotate, and when the rotary support 223 synchronously rotates around the axle of the driven gear 221, each extrusion screw 31 rotatably mounted on the rotary support 223 synchronously revolves around the axle, at this time, the consumable 200 contacts with the extrusion screw 31, the extrusion screw 31 can rotate relative to the driven gear 221 and the rotary support 223 due to the resistance of the consumable 200, and generates a component force in the extrusion direction, so as to push the consumable 200 to extrude or withdraw along the extrusion direction, that is, the extrusion screw 31 synchronously rotates while revolving, and on the basis of extruding or withdrawing the consumable 200, the wear of the consumable 200 by the extrusion screw 31 is reduced.

In one embodiment, the number of the fixing members 222 corresponds to the number of the extrusion screws 31, the fixing members 222 are provided in three, and the three extrusion screws 31 are respectively provided between two adjacent fixing members 222 and respectively obliquely rotatably connect the driven gear 221 and the rotary support 223.

In one embodiment, one end of the fixing member 222 is retained in the rotating support 223, and the other end is fixed to the driven gear 221 by a fixing pin 222 a.

The transmission assembly 22 also includes a gear bearing 224 and a carrier bearing 225. The gear bearing 224 is connected to the driven gear 221 and fixed to the upper top surface of the housing 11, and the holder bearing 225 is connected to the rotary holder 223 and fixed to the bottom of the accommodating chamber 111. The transmission assembly 22 rotates relative to the housing 11 through the gear bearing 224 and the carrier bearing 225, thereby rotating the screw assembly 30. Specifically, the driven gear 221 is provided with a first connecting shaft 2211, and the length direction of the first connecting shaft 2211 is perpendicular to the end face of the driven gear 221 facing away from the rotary support 223. The first connecting shaft 2211 is interference-fitted with the gear bearing 224. The rotating support 223 is provided with a second connecting shaft 2231, the length direction of the second connecting shaft 2231 is perpendicular to the end surface of the rotating support 223 departing from the driven gear 221, and the second connecting shaft 2231 is in interference fit with the support bearing 225.

In one embodiment, the radius of the driving gear 212 is smaller than the radius of the driven gear 221. The driving force of the motor is transmitted to the large-sized driven gear 221 through the small-sized driving gear 212, thereby increasing the output torque of the motor. It can be understood that the motor with smaller torque can be selected for use through the setting, so that the weight and the volume of the 3D printing extrusion device 100 are reduced, and the load inertia of the printer is reduced, thereby realizing high-precision and stable printing effect.

Referring to fig. 4 and 5, the driven gear 221 and the rotary support 223 are respectively provided with through holes 22a, and the through holes 22a are respectively located at both sides of the feed end 30a and the discharge end 30b of the screw assembly 30. The through holes 22a of the driven gear 221 and the rotary support 223 correspond to and are approximately aligned with the space between the screw assembly 30 for holding the consumable 200, and the consumable 200 enters the feed end 30a of the screw assembly 30 after passing through the through hole 22a of the driven gear 221, and then is extruded from the discharge end 30b of the screw assembly 30 through the through hole 22a of the rotary support 223.

Referring to fig. 3, each screw assembly 30 includes an extrusion screw 31 and screw bearings 32 disposed at both ends of the extrusion screw 31. The screw bearings 32 at both ends are alternately provided on the driven gear 221 and the rotary support 223, respectively, so that the trapezoidal extrusion screw 31 is disposed obliquely with respect to the driven gear 221 and the rotary support 223. When the driven gear 221 and the rotary support 223 rotate, the extrusion screw 31 is rotated relative to the driven gear 221 and the rotary support 223 by the screw bearing 32. In one embodiment, the extrusion screw 31 is a trapezoidal extrusion screw 31. In one embodiment, the plurality of extrusion screws 31 of the plurality of screw assemblies 30 are inclined at the same angle, so that the intervals between the plurality of extrusion screws 31 are changed linearly, thereby avoiding affecting the feeding stability.

Taking three extrusion screws 31 as an example, in an embodiment, the three extrusion screws 31 of the screw assembly 30 are respectively and obliquely arranged on the driven gear 221 and the rotating support 223 through corresponding screw bearings 32, the axis of each extrusion screw 31 and the extrusion direction of the consumable 200 are arranged at a predetermined angle, and the axis of each extrusion screw 31 and the extrusion direction of the consumable 200 are arranged at a predetermined angle, so that the inclination angles of the three extrusion screws 31 are the same, and the intervals between the three extrusion screws 31 are gradually arranged from the feeding end to the discharging end of the three extrusion screws 31 from large to small. The extrusion force of the consumable 200 clamped among the three extrusion screws 31 is gradually increased along with the reduction of the distance, so that the extrusion force is gradually increased, a larger extrusion force can be realized under the condition of a lower pre-pressure, stable feeding can be realized under the condition of no need of a larger pre-pressure, and the feeding stability is ensured.

The distance between the three extrusion screws 31 is the pre-pressure for holding the consumable 200, so that the pre-pressure between the three extrusion screws 31 can be adjusted by adjusting the distance between the three extrusion screws 31. In one embodiment, the pitch between the three trapezoidal extrusion screws 31 can be adjusted by adjusting the inclination angles of the three trapezoidal extrusion screws 31. It will be appreciated that the angle of inclination of the trapezoidal extrusion screw 31 can be adjusted according to the extrusion force required for the consumable.

In one embodiment, one end of the extrusion screw 31 is rotatably coupled to the rotary support 223, and the other end is disposed to be inclined in a circumferential direction of the driven gear 221 with respect to an axis of the driven gear 221. In another embodiment, one end of the extrusion screw 31 is rotatably connected to the rotary support 223, and one end of the extrusion screw 31 connected to the driven gear 221 is inclined away from the axis of the driven gear 221.

Referring to fig. 2, the 3d printing and extruding device 100 further includes a heat dissipating mechanism 40, the heat dissipating mechanism 40 includes a heat dissipating fin 41 and a heat dissipating fan 42 disposed against the heat dissipating fin 41, the heat dissipating fin 41 is disposed at the discharging end of the trapezoidal extrusion screw 31, and the heat dissipating fan 42 is used for guiding out the heat absorbed by the heat dissipating fin 41, so as to prevent the heating device of the printing nozzle from affecting the consumable 200. It can be understood that the discharge end of each trapezoidal extrusion screw 31 is provided with a heat sink 41, and the heat sink fan 42 abuts against the two heat sinks 41 to guide out the heat absorbed by the two heat sinks 41.

Taking the three trapezoidal extrusion screws 31 as an example, when the 3D printing extrusion apparatus 100 is used, firstly, the consumable 200 passes through the through hole 22a of the driven gear 221 and enters between the three trapezoidal extrusion screws 31, then the driven gear 221 and the rotary support 223 are driven by the motor to rotate relative to the housing 11, the three trapezoidal extrusion screws 31 are driven by the screw bearing 32 to rotate relative to the driven gear 221 and the rotary support 223, and the consumable between the three trapezoidal extrusion screws 31 is extruded or drawn back from the through hole 22a of the rotary support 223 by controlling the rotation direction of the motor.

This application still provides an adopt above-mentioned 3D to print extrusion device 100's 3D printer, and this 3D printer prints extrusion device 100 through 3D and realizes the pay-off.

The 3D printing extrusion device 100 and the 3D printer with the 3D printing extrusion device 100 adopt a mode that the plurality of extrusion screws 31 revolve around the extrusion direction of the consumable 200 to drive the consumable 200 driven by the plurality of extrusion screws to extrude or withdraw along the feeding direction, compared with a traditional hobbing structure extrusion mode, the material planing phenomenon caused by a traditional hobbing structure is solved, further, no crushed material falls into a spray head in the printing process, the printing quality problem caused by the crushed material is avoided, the distance between the plurality of obliquely arranged extrusion screws 31 is changed from large to small, the extrusion force is improved, the larger extrusion force can be realized under the condition of lower pre-pressure, stable feeding can be realized under the condition of no need of the larger pre-pressure, and the feeding stability is ensured.

It should be understood by those skilled in the art that the above embodiments are only for illustrating the present application and are not to be taken as limiting the present application, and that suitable changes and modifications to the above embodiments are within the scope of the present disclosure as long as they are within the spirit and scope of the present application.

Claims

1. A3D printing extrusion device for extruding consumables, comprising:

a housing;

the driving mechanism is arranged in the shell;

its characterized in that, 3D prints extrusion device still includes:

the screw assembly comprises a plurality of extrusion screws, the screw assembly is arranged in the shell and connected to the driving mechanism, consumables are clamped among the extrusion screws, the axis of each extrusion screw is obliquely arranged relative to the extrusion direction of the consumables, and the distance between the obliquely arranged extrusion screws is arranged from the feed end to the discharge end from large to small;

the driving mechanism drives the screw assembly to rotate around the extrusion direction of the consumable, and is used for extruding the consumable from the feed end of the screw assembly to the discharge end of the screw assembly or pumping the consumable back from the discharge end of the screw assembly to the feed end of the screw assembly.

2. The 3D printing extrusion device according to claim 1, wherein the axis of each extrusion screw is arranged at an angle with the extrusion direction of the consumable.

3. The 3D printing extrusion device according to claim 1, wherein the driving mechanism comprises a driving component and a transmission component, the transmission component is connected to the extrusion screw, and the driving component is in gear with the transmission component to drive the transmission component to rotate around the extrusion direction of the consumable relative to the housing so as to synchronously drive the screw component to rotate around the extrusion direction of the consumable.

4. The 3D printing extrusion device of claim 3 wherein the transmission assembly comprises a driven gear, a fixed member and a rotating support, the driven gear is geared to the drive assembly; the driven gear is connected with the rotary support through the fixing piece, and when the driven gear rotates, the rotary support synchronously rotates around a wheel shaft of the driven gear; the screw assemblies are arranged on the rotary support, and each extrusion screw is respectively connected with the driven gear and the rotary support in an inclined rotation mode.

5. The 3D printing extrusion device according to claim 4, wherein the driving assembly comprises a driving member arranged on the housing and a driving gear connected to a rotating shaft of the driving member, and the driving gear is meshed with the driven gear so as to drive the driving gear to rotate through the driving member to drive the driven gear to rotate.

6. The 3D printing extrusion device according to claim 4, wherein the driven gear and the rotary support are provided with through holes corresponding to the positions of the extrusion screws, the through holes extend in the direction corresponding to the positions of the extrusion screws, and consumables enter the feeding end of the screw assembly through the through holes in the driven gear and are extruded from the discharging end of the screw assembly through the through holes in the rotary support.

7. The 3D printing extrusion device according to claim 4, wherein each of the extrusion screws has screw bearings at both ends thereof, the screw bearings being provided on the driven gear and the rotary support to rotate each of the extrusion screws relative to the driven gear and the rotary support.

8. The 3D printing extrusion device according to any one of claims 4 to 7, wherein the extrusion screws are arranged obliquely with respect to the driven gear, and the inclination angles of the extrusion screws are the same.

9. The 3D printing extrusion device of claim 8, wherein one end of the extrusion screw is rotatably connected to the rotary support, and the other end is obliquely arranged along a radial direction or a circumferential direction of the driven gear.

10. 3D printer characterized in that it comprises a 3D printing extrusion device according to any one of claims 1 to 9.