CN204020008U - A kind of 3D printer head - Google Patents

Abstract

The utility model relates to 3D printing technique field, especially a kind of 3D printer head.The utility model includes conveying pipeline, material extrusion nozzle; Material extrusion nozzle is positioned at below conveying pipeline; Also include peripheral housing and drive unit, conveying pipeline is embedded in peripheral housing, and conveying pipeline is coaxially connected with material extrusion nozzle; Material extrusion nozzle, under the driving of drive unit, can rotate relative to conveying pipeline and regulate shower nozzle to spray the sectional area of silk.The utility model can control speed and the precision of printing, when guaranteeing required precision, promotes overall print speed; The nozzle structure of 3D printer can be applied to and control.

Description

A kind of 3D printer head

Technical field

The utility model relates to 3D printing technique field, especially a kind of 3D printer head.

Background technology

It is a kind of RP technique that 3D prints, and 3D mathematical model is carried out layering sliding-model control by software by it, then uses powdery metal or plastics etc. can adhesive material, constructs entity by the mode of successively piling up.3D printing technique belongs to one and adds formula manufacture category, is different from traditional formula that subtracts and manufactures category, better can save raw materials for production.

Common 3D printing technique has fuse deposition technique, it is by thread heat-fusible materials heating and melting, gush out by squeezing with the shower nozzle of a micro-channel, after nozzle ejection, deposition on the table, temperature, lower than starting solidification after solidification temperature, finally forms finished product by the accumulation layer by layer of material.Shower nozzle is wherein exactly a core component, but the material extrusion nozzle inside diameter cross sectional shape of existing 3D printer printing head only has fixing circle, fixes when unit interval inner nozzle sprays the volume of silk.Non-adjustable due to nozzle inside diameter area of section, we can not the printing precision of control 3D printer and speed; But for different printing purposes and different print areas, need different printing precision and speed.Even same model, also there is different required precisions at model inside and edge.

Summary of the invention

The technical problem that the utility model solves is that based on current 3D printer nozzle internal diameter cross sectional shape be all circular, the present situation for different model or the print speed of same model zones of different and the control of precision can not be accomplished, a kind of 3D printing head is provided, print speed and precision can be regulated.

The technical scheme that the utility model solves the problems of the technologies described above is:

Include conveying pipeline, material extrusion nozzle; Material extrusion nozzle is positioned at below conveying pipeline; It is characterized in that: also include peripheral housing and drive unit, conveying pipeline is embedded in peripheral housing, and conveying pipeline is coaxially connected with material extrusion nozzle; Material extrusion nozzle, under the driving of drive unit, can rotate relative to conveying pipeline and regulate shower nozzle to spray the sectional area of silk.

Described drive unit comprises driving gear, driven gear and motor; Driving gear is fixed in peripheral housing, and driven gear is fixed on material extrusion nozzle; Driving gear engages with driven gear; Motor drives driving gear; Driven gear, under the drive of driving gear, drives material extrusion nozzle rotation.

The center of gravity of the center of gravity of the inner passage section shape of described conveying pipeline and the inner passage section shape of material extrusion nozzle coincides with the same axle of the inner passage section of vertical conveying pipes road and material extrusion nozzle; Material extrusion nozzle can rotate around this axle.

Described driven gear is fixed on material extrusion upper end of nozzle.

The inner passage section shape of described conveying pipeline and the inner passage section shape of material extrusion nozzle are the polygon of rule.

The polygon of described rule can be the polygon of rule of triangle, quadrilateral type.

The equilateral triangle of the inner passage section shape of described conveying pipeline and the inner passage section shape of material extrusion nozzle to be the length of side be 3a; Material extrusion nozzle is θ around the anglec of rotation of the axle of the inner passage section shape perpendicular to conveying pipeline and material extrusion nozzle; The area of the overlapping region of two sections is the sectional area S of actual extruded material in the material extrusion nozzle unit interval; Then

$S=\frac{9\sqrt{3}}{4}\frac{1+{\tan }^2\frac{\mathrm{\θ}}{2}}{1+\sqrt{3}\tan \frac{\mathrm{\θ}}{2}}{a}^2$

Described θ is also the anglec of rotation of motor regulation and control material extrusion nozzle.

Including heater in described peripheral housing, for heating the transmission material of the easy melting of ABS or the PLA class in conveying pipeline, being molten condition.Beneficial effect:

The utility model by controlling the rotation of motor, and then controls the anglec of rotation of material extrusion nozzle relative to conveying pipeline; Thus the control realized nozzle actual spray silk sectional area; To control printing precision and the speed of printer.For different printing purposes and different print areas, different printing precision and speed can be adjusted.

Accompanying drawing explanation

Below in conjunction with accompanying drawing, the utility model is further illustrated:

Fig. 1 is the utility model printer head front view;

Fig. 2 is the main building block schematic diagram of the utility model printer head;

Wherein: a-conveying pipeline oblique view b-conveying pipeline top view

C-material extrusion nozzle oblique view d-material extrusion nozzle top view

Fig. 3 is the utility model conveying pipeline inner passage section and material extrusion nozzle inner passage section top view, and wherein O is the center of gravity of two identical equilateral triangles, and θ is the angle of their perpendicular bisectors;

When Fig. 4 is θ=π/3, conveying pipeline and material extrusion nozzle inner passage section top view;

When Fig. 5 is θ=0, conveying pipeline and material extrusion nozzle inner passage section top view;

Fig. 6 is the logic chart of the utility model print speed influence factor;

Fig. 7 is the utility model print speed regulator control system figure.

Detailed description of the invention

Be illustrated in figure 1 the front view of the utility model 3D printer head, main building block schematic diagram as shown in Figure 2; Comprise conveying pipeline 103 and material extrusion nozzle 107 and peripheral housing 101, conveying pipeline 103 and peripheral housing 101 are fixed on printer body, and conveying pipeline 103 is embedded in peripheral housing 101.Include heater in peripheral housing, the transmission material in heating conveying pipeline 103, be molten condition, this transmission material can be the easy melted materials such as ABS or PLA.

Conveying pipeline 103 is coaxially connected with material extrusion nozzle 107, and internal channel 102 cross sectional shape of conveying pipeline and internal channel 108 cross sectional shape of material extrusion nozzle are the polygon of rule, and the polygon of this rule can be triangle, quadrangle etc.Wherein, the center of gravity of the center of gravity of internal channel 102 cross sectional shape of conveying pipeline and internal channel 108 cross sectional shape of material extrusion nozzle is on the same axle perpendicular to internal channel 102 cross section of conveying pipeline and internal channel 108 cross section of material extrusion nozzle.

The top of material extrusion nozzle 107 is fixed with a driven gear 104, and the rotation of driven gear 104 can drive the rotation of material extrusion nozzle 107.In peripheral housing 101, the rotation of motor can drive the rotation of driving shaft 106, and driving shaft 106 upper end is fixed with a driving gear 105, and driving gear 105 can drive the rotation of driven gear 104.The rotation number of turns that the utility model controls motor accurately by software regulates and controls material extrusion nozzle 107 around the anglec of rotation θ perpendicular to internal channel 102 cross section of conveying pipeline and internal channel 108 sectional axis of material extrusion nozzle.

As shown in Figure 3, material extrusion nozzle 107 is θ around the anglec of rotation perpendicular to internal channel 102 cross sectional shape of conveying pipeline and the internal channel 108 cross sectional shape axle of material extrusion nozzle.Wherein dash area is internal channel 102 section triangle and the material extrusion nozzle internal channel 108 section triangle overlapping region of conveying pipeline, and the area of this overlapping region is also the sectional area of actual extruded material in material extrusion nozzle 107 unit interval.

Set forth further with a specific embodiment of the present utility model below; Internal channel 102 cross sectional shape of design conveying pipeline and internal channel 108 cross sectional shape of material extrusion nozzle are the equilateral triangle that the length of side is 3a, the angle rotated by motor regulation and control material extrusion nozzle 107 is θ, and the area of the overlapping region in internal channel 102 cross section of conveying pipeline and internal channel 108 cross section of material extrusion nozzle is the area S of shadow region in Fig. 3.Then

$S=\frac{9\sqrt{3}}{4}\frac{1+{\tan }^2\frac{\mathrm{\θ}}{2}}{1+\sqrt{3}\tan \frac{\mathrm{\θ}}{2}}{a}^2$

The sectional area of the actual extruded material of material extrusion nozzle 107 in the unit interval is changed by motor regulation and control θ value.Because the work translational speed of printing head is constant, for guaranteeing that every layer of Z axis forming height is certain value, the charging rate of conveying pipeline 103 to be regulated and controled in real time according to the sectional area of the actual extruded material of material extrusion nozzle 107.Charging rate is equal with the hot melt velocity magnitude of transmission material, is also print speed V when printer works simultaneously.

In situation as shown in Fig. 4,7, the area of dash area is minimum, time also namely print speed is minimum, when can be applied in higher to printing required precision.Area maximum of shadow region in situation, time also namely print speed is maximum, when can be applied in not high to printing required precision, shortens the time-write interval as shown in Figure 5.

As shown in Figure 6,7, in the utility model, print speed regulate and control method is:

Print speed V=K*S*L; Wherein S is the sectional area of nozzle actual spray silk, and L is unit printing-forming area, and K is the constant relevant with printer;

Nozzle actual spray silk sectional area S and unit printing-forming area L determines charging rate, and affects hot melt speed; Charging rate and hot melt speed determine print speed jointly;

Form a signal by the change of S and L and control print speed, namely regulate and control the charging rate of shower nozzle conveying pipeline.

Claims (10)

1. a 3D printer head, includes conveying pipeline, material extrusion nozzle; Material extrusion nozzle is positioned at below conveying pipeline; It is characterized in that: also include peripheral housing and drive unit, conveying pipeline is embedded in peripheral housing, and conveying pipeline is coaxially connected with material extrusion nozzle; Material extrusion nozzle, under the driving of drive unit, can rotate relative to conveying pipeline and regulate shower nozzle to spray the sectional area of silk.

2. 3D printer head according to claim 1, is characterized in that: described drive unit comprises driving gear, driven gear and motor; Driving gear is fixed in peripheral housing, and driven gear is fixed on material extrusion nozzle; Driving gear engages with driven gear; Motor drives driving gear; Driven gear, under the drive of driving gear, drives material extrusion nozzle rotation.

3. 3D printer head according to claim 1, is characterized in that: the center of gravity of the center of gravity of the inner passage section shape of described conveying pipeline and the inner passage section shape of material extrusion nozzle coincides with the same axle of the inner passage section of vertical conveying pipes road and material extrusion nozzle; Material extrusion nozzle can rotate around this axle.

4. 3D printer head according to claim 2, is characterized in that: the center of gravity of the center of gravity of the inner passage section shape of described conveying pipeline and the inner passage section shape of material extrusion nozzle coincides with the same axle of the inner passage section of vertical conveying pipes road and material extrusion nozzle; Material extrusion nozzle can rotate around this axle.

5. the 3D printer head according to claim 2 or 4, is characterized in that: described driven gear is fixed on material extrusion upper end of nozzle.

6. the 3D printer head according to any one of Claims 1-4, is characterized in that: the inner passage section shape of described conveying pipeline and the inner passage section shape of material extrusion nozzle are the polygon of rule.

7. 3D printer head according to claim 6, is characterized in that: the polygon of described rule can be the polygon of rule of triangle, quadrilateral type.

8. 3D printer head according to claim 6, is characterized in that: the equilateral triangle of the inner passage section shape of described conveying pipeline and the inner passage section shape of material extrusion nozzle to be the length of side be 3a; Material extrusion nozzle is θ around the anglec of rotation of the axle of the inner passage section shape perpendicular to conveying pipeline and material extrusion nozzle; The area of the overlapping region of two sections is the sectional area S of actual extruded material in the material extrusion nozzle unit interval; Then

Described θ is also the anglec of rotation of motor regulation and control material extrusion nozzle.

9. 3D printer head according to claim 7, is characterized in that: the equilateral triangle of the inner passage section shape of described conveying pipeline and the inner passage section shape of material extrusion nozzle to be the length of side be 3a; Material extrusion nozzle is θ around the anglec of rotation of the axle of the inner passage section shape perpendicular to conveying pipeline and material extrusion nozzle; The area of the overlapping region of two sections is the sectional area S of actual extruded material in the material extrusion nozzle unit interval; Then

Described θ is also the anglec of rotation of motor regulation and control material extrusion nozzle.

10. 3D printer head according to claim 9, is characterized in that: include heater in described peripheral housing, for heating the transmission material of the easy melting of ABS or the PLA class in conveying pipeline, is molten condition.