CN208324222U - 3D printing spray head and printer comprising the 3D printing spray head - Google Patents

Abstract

3D printing spray head and 3D printer, it is related to increasing material manufacturing equipment technical field, the 3D printing spray head includes head body, head body inner vertical is provided with tapping channel, the end of tapping channel is discharge port, furthermore, the 3D printing spray head further includes baffle, baffle is connected with the Baffle drive device for driving it to withdraw and return to blocking position, when baffle is located at blocking position, it keeps off the lower outer in discharge port, the melted material squeezed out from discharge port is during side outward is flowed by baffle, so that the sedimentary printed matches in the profile close to the baffle side with the blocking surface profile of the baffle.During print job, due to the barrier effect of baffle, the sedimentary printed can be made to match in the profile close to baffle side with the blocking surface profile of the baffle, to substantially mitigate the lateral hole line quantity of the product outermost surface printed, product external surfaces smoothness is improved, later period polishing treatment workload is reduced.

Description

3D printing spray head and printer comprising the 3D printing spray head

Technical field

The utility model relates to increasing material manufacturing equipment technical field, in particular to a kind of 3D printing spray head and beaten comprising the 3D Print the printer of spray head.

Background technique

In recent years, 3D printing technique is applied in more and more fields, and common 3D printing material has nylon, metal And rubber.

Thermoplastic material (such as nylon) is often used in fusion sediment formula (FDM) printing occasion.Nylon yarn (or its His thermoplastic material) it is sent into ejection head unit by feed unit (feed unit includes passage, wire feeding gear and trunnion), spray Head unit includes heat block and spray head, and hot melt channel is equipped with inside heat block, which is connected with spray head, and nylon yarn is in warm It is heated in being melt through and becomes molten condition, the wire feeding gear of feed unit constantly pushes nylon yarn into hot melt channel, to make Material molten in channel must be heated constantly to pour in spray head, and be discharged down from the discharge port of spray head, squeezed out through spray head Melted material layer by layer deposition, while cooperating cooling fan supplement heat rejecter, finally obtain three-dimensional product.

Now common 3D printing nozzle structure mostly as shown in Figure 1, when melted material from spray head discharge port extrusion after, by The effect of material surface tension under molten condition, the arc surfaced (seeing figure 1 and figure 2) that evagination will be presented in two sides, this Sample will lead to following problems: 1, (depth of lines prints thick the lateral hole line of the product outermost surface printed with single layer Degree is related) quantity is more and obvious, and increase later period polishing treatment workload (can be thrown using physics polishing or acetone steam Light, naturally it is also possible to which applying smooth liquid in product external surfaces keeps its smoothened).2, it can be formed shown in Fig. 3 and Fig. 4 in interiors of products Hole, cause product mechanical property to reduce.

Utility model content

The technical problem to be solved by the present invention is to provide a kind of 3D printing sprays that product external surfaces smoothness can be improved Head, further, the utility model also provide a kind of printer comprising aforementioned 3D printing spray head.

In order to solve the above-mentioned technical problem, the utility model adopts the following technical solution: a kind of 3D printing spray head, including spray Head ontology, the head body inner vertical are provided with tapping channel, and the end of the tapping channel is discharge port, in addition, should 3D printing spray head further includes baffle, and the baffle is connected with for driving it to withdraw and return to the barrier driving of blocking position dress It sets, when the baffle is located at blocking position, keeps off the lower outer in discharge port, the melted material squeezed out from the discharge port exists By baffle during side flowing outward, so that the sedimentary printed is in the profile close to the baffle side It matches with the blocking surface profile of the baffle.

Embodiment as one preferred, the baffle are rotatably connected in head body, the barrier driving dress It sets including telescoping cylinder, the piston rod of the telescoping cylinder connects baffle, and driving baffle is up overturn and remote when the telescoping cylinder is shunk Material mouth is separated out, the telescoping cylinder stretches prolonged driving baffle and overturns down and keep off the lower outer in discharge port.

Further, the quantity of the telescoping cylinder is two, and the baffle is connected by card ball joint and head body It connects, the respective independent control of the telescoping cylinder, driving baffle up overturn and separate discharge port when all telescoping cylinder synchronous, institute There is telescoping cylinder to synchronize to stretch prolonged driving baffle and overturn and keep off the lower outer in discharge port down, the telescoping cylinder is shunk or elongation Baffle is driven to deflect by node of card ball joint when asynchronous.

As another preferred embodiment, the Baffle drive device includes feed screw nut pair and the first engine Structure, the feed screw nut pair include screw rod and nut, and the head body is equipped with for being oriented to from when baffle moves up and down The baffle guide frame of effect, the top of the baffle are fixedly connected with nut, and the first power mechanism connection wire rod can simultaneously drive Dynamic screw rod rotation, drives nut to move down or up together with baffle by rotating the screw rod, so that corresponding realize allows The baffle returns to blocking position or withdraws from blocking position.

Wherein, first power mechanism is stepper motor or servo motor, the stepper motor or servo motor it is dynamic Power output shaft is connect with screw rod by shaft coupling.

On the basis of the embodiment above, further, it is equipped in the tapping channel for promoting melted material Toward the disturbance component of surrounding flowing after discharge port squeezes out, the disturbance component is connected with for driving it to transport in tapping channel Dynamic disturbance part driving device.

Preferably, the disturbance component includes the disturbing rod being vertically arranged in tapping channel, the disturbance part driving dress Set and connect with disturbing rod and it can be driven to pump in tapping channel, the disturbing rod in tapping channel down When moving to minimum point, bottom end is located above discharge port and close to discharge port.

It further, further include that feeding-passage inside head body is horizontally or diagonally set and in disturbing rod The disturbing rod guide frame playing the guiding role when pumping to it, the feeding-passage be located above tapping channel and Be connected to tapping channel, the angle between the feeding-passage and tapping channel is right angle or obtuse angle, the feeding-passage it is upper Side offers the through-hole for extending upward through head body, and the top of the disturbing rod is pierced by from through-hole, the through-hole and disturbing rod Size match and play the guiding role when the disturbing rod pumps to it, the disturbance part driving device packet Include the crankshaft being arranged in outside head body and the second power mechanism for driving crank rotation, the top of the disturbing rod It is rotatably connected on crankshaft, second power mechanism includes motor.

On the other hand, the utility model also provides a kind of 3D printer comprising above-mentioned 3D printing spray head.

In 3D printing spray head provided by the utility model, when spray head starts print job, it can be filled by barrier driving It sets driving baffle and is moved to blocking position, baffle keeps off the lower outer in discharge port at this time, the melted material squeezed out from discharge port The sedimentary printed can be made to exist due to the barrier effect of baffle by baffle during side outward is flowed Profile close to baffle side (i.e. sedimentary outer surface) matches with the blocking surface profile of the baffle, beats to substantially mitigate The lateral hole line quantity for printing off the product outermost surface come, improves product external surfaces smoothness, reduces later period polishing treatment work It measures.

Detailed description of the invention

Fig. 1 is the structural schematic diagram for commonly using the materials at two layers of 3D printing spray head and its printing now；

Fig. 2 is the partial enlarged view at the position A in Fig. 1；

Fig. 3 for the institute of 3D printing spray head shown in Fig. 1 printed product internal structural defects schematic diagram；

Fig. 4 is the partial enlarged view at the position A in Fig. 3；

Fig. 5 is the first structural schematic diagram of 3D printing spray head involved by the utility model；

Fig. 6 is second of structural schematic diagram of 3D printing spray head involved by the utility model；

Fig. 7 is the third structural schematic diagram of 3D printing spray head involved by the utility model；

Fig. 8 is the 4th kind of structural schematic diagram of 3D printing spray head involved by the utility model；

Fig. 9 is the schematic perspective view of head body in 3D printing spray head shown in Fig. 5-7；

Figure 10 is the schematic diagram of internal structure of head body shown in Fig. 9；

Figure 11 is the attachment structure schematic diagram of baffle and telescoping cylinder in 3D printing spray head shown in Fig. 6；

Figure 12 is the partial enlarged view at the position A in Fig. 6；

Figure 13 is the partial enlarged view at the position A in Fig. 7；

Figure 14 is the partial enlarged view at the position A in Fig. 8；

Figure 15 and Figure 16 is that the circle sedimentary internal structure of outside two of the institute of 3D printing spray head shown in Fig. 5-8 printed product is shown It is intended to；

Figure 17 is the partial enlarged view at the position A in Figure 16；

In figure:

1 --- head body 2 --- tapping channel 3 --- baffle

4 --- Baffle drive device 5 --- card ball joint 6 --- disturbance components

4a --- telescoping cylinder 4b --- lead screw 4c --- nut

7 --- disturbance part driving device 8 --- feeding-passage 9 --- electromagnet

10 --- spring 1a --- through-hole 2a --- discharge ports

6a --- disturbing rod 7a --- crankshaft 7b --- second power mechanism.

Specific embodiment

Need to illustrate in advance, in the description of the present invention, term " on ", "lower", "left", "right", The orientation or positional relationship of the instructions such as "top", "bottom", "inner", "outside", "front", "rear" is orientation based on the figure or position Relationship is set, is merely for convenience of describing the present invention and simplifying the description, rather than the device or element of indication or suggestion meaning It must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.

In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " Gu It is fixed " etc. terms shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can It, can also be indirectly connected through an intermediary to be to be connected directly.It for the ordinary skill in the art, can basis Concrete condition understands the concrete meaning of above-mentioned term in the present invention.

The improvements of the utility model compared with the existing technology in order to facilitate understanding by those skilled in the art, below with reference to Embodiment and attached drawing are further described the utility model.

Fig. 5-8 shows structure in four of 3D printing spray head involved by the utility model, and 3D printing spray head shown in Fig. 5-8 is equal Including head body 1, as shown in Fig. 9 and 10,1 inner vertical of head body is provided with tapping channel 2, the end of tapping channel 2 For discharge port 2a, further, diagram 3D printing spray head further includes baffle 3, and baffle 3 is connected with for driving it to withdraw and return to The Baffle drive device 4 of blocking position when baffle 3 is located at blocking position, keeps off the lower outer in discharge port 2a, from discharge port The melted material that 2a is squeezed out is stopped during side outward is flowed by baffle 3, so that the sedimentary printed is being leaned on The profile of nearly 3 side of baffle matches with the blocking surface profile of the baffle 3.

When spray head shown in Fig. 5-8 starts to print the operation of outer ring sedimentary, baffle can be driven by Baffle drive device 4 3 are moved to blocking position, and the gear of baffle 3 is in the lower outer of discharge port 2a at this time, and the melted material squeezed out from discharge port 2a is past Outside is stopped during flowing by baffle 3, due to the barrier effect of baffle 3, the sedimentary printed can be made to lean on The profile of nearly 3 side of baffle (i.e. sedimentary outer surface) matches with the blocking surface profile of the baffle 3, it is preferable that Ke Yitong The print platform (not shown) of rotation 3D printer is crossed, so that baffle 3 is always in sedimentary outside.For convenient for this field Technical staff understands that Figure 15-17 shows two circle sedimentary internal structure on the outside of the product with above-mentioned 3D printing nozzle printing, from Figure 15-17 can be seen that the blocking due to baffle 3, the outer side edges (assuming that left side is outmost turns sedimentary in figure) of sedimentary It is very smooth, will not be in evagination arc surfaced shown in Fig. 1 and 2, this is by very big for the raising of the smooth outer surface degree of product It helps, can substantially mitigate the lateral hole line quantity of the product outermost surface printed, it is smooth to improve product external surfaces Degree reduces later period polishing treatment workload.

Specifically, in 3D printing spray head shown in Fig. 5, baffle 3 is rotatably connected in head body 1, and baffle drives Dynamic device 4 includes telescoping cylinder 4a, and the piston rod of telescoping cylinder 4a connects baffle 3, and driving baffle 3 is up overturn when telescoping cylinder 4a is shunk And it stretches prolonged driving baffle 3 far from discharge port 2a, telescoping cylinder 4a and overturns down and keep off the lower outer in discharge port 2a.

In 3D printing spray head shown in Fig. 6, the quantity of telescoping cylinder 4a is two (as shown in Figure 11), can from Figure 12 Out, baffle 3 is to be connect by card ball joint 5 with head body 1, the respective independent control of two telescoping cylinder 4a, all flexible Baffle 3 is driven up to overturn simultaneously far from discharge port 2a when cylinder 4a synchronous, all telescoping cylinder 4a, which are synchronized, stretches prolonged driving baffle 3 The lower outer in discharge port 2a is overturn and kept off down, drives baffle 3 with spherical shape ten thousand when telescoping cylinder 4a shrinks or extends asynchronous It is node deflection to connector 5.

3D printing spray head shown in Fig. 5 and Fig. 6 is moved using telescoping cylinder 4a driving baffle 3, and design in this way has following benefit: 1, Driving structure is simple, easy to maintain.2, compact overall structure, spray head volume can control in relatively mild range.3, special Not it is worth mentioning that structure shown in fig. 6, in Fig. 6, baffle 3 is driven by two telescoping cylinder 4a, when two telescoping cylinder 4a are received When contracting or extending asynchronous, will driving baffle 3 with card ball joint 5 be node deflect, can allow in this way baffle 3 realization more Blocking mode abundant, the printing suitable for more kinds of different shape products.Need to remind those skilled in the art it is noted that Above-mentioned telescoping cylinder 4a includes but is not limited to telescopic cylinder, such as is also possible to flexible electric cylinders or hydraulic cylinder, and when practical application can To be selected as needed.

In 3D printing spray head shown in Fig. 7, Baffle drive device 4 includes feed screw nut pair and the first power mechanism, is seen Shown in Figure 13, feed screw nut pair includes screw rod 4b and nut 4c, and head body 1 is equipped with for from when baffle 3 moves up and down The baffle guide frame of guiding role, the top of baffle 3 are fixedly connected with nut 4c, the first power mechanism (the first power in Fig. 7 Mechanism is the motor that 1 top of head body is arranged in) connection wire rod 4b and can drive screw rod 4b rotate, be by rotary screw rod 4b Nut 4c can be driven to move down or up together with baffle 3, so that corresponding realize allows baffle 3 to return to blocking position or from blocking Position is withdrawn.When practical application, the preferred stepper motor of the first power mechanism or servo motor, wherein the stepper motor or servo The power output shaft of motor is connect with screw rod 4b by shaft coupling.Using stepper motor (or servo motor) and feed screw nut pair The mode that cooperation driving baffle 3 moves up and down is mainly based upon considered below: for different products or different printings essence Degree requires, and spray head single layer print thickness will be different, and cooperates feed screw nut pair can be with by stepper motor (or servo motor) Accurate control 3 up and down motion amount of baffle, so that accuracy controlling baffle 3 effectively blocks thickness and makes itself and single layer print thickness phase Matching.

In 3D printing spray head shown in Fig. 8, unlike structure shown in Fig. 7, the up and down motion of baffle 3 is to pass through Figure 14 In 9 power on/off of electromagnet realize that when electromagnet 9 is powered, baffle 3 is moved to resistance by the effect of electromagnet 9 magnetic attraction down Stop bit is set, and after electromagnet 9 powers off, baffle 3, which is up moved and withdrawn under 10 rebound effect of spring, prevents position, this structure Also has the advantages of compact, small volume.

It is further improved as to above-mentioned 3D printing spray head, as shown in Fig. 5-10, is additionally provided with use in tapping channel 2 In promoting melted material after discharge port 2a extrusion toward the disturbance component 6 of surrounding flowing, disturbance component 6 is connected with for driving it The disturbance part driving device 7 moved in tapping channel 2.

After increasing disturbance component 6, when spray head works, disturbance component 6 is logical in discharging under the driving of disturbance part driving device 7 It is moved in road 2, and then disturbs the fused materials that squeeze out through discharge port 2a, promoted it toward surrounding flowing, sprawl, enable material The corner position for preferably flowing into product printing portion side, to fill the gap of outer convex globoidal corner, to mitigate printing The interiors of products porosity of completion improves product mechanical property.With the interiors of products of the nozzle printing for increasing disturbance component 6 Structure is as shown in Figure 15-17, and wherein Figure 15 show comparatively ideal state, in Figure 15, the gap quilt of outer convex globoidal corner It is filled up completely, without clearly visible hole.Although there are still visible hole, the holes to compare Fig. 3 and figure for structure shown in Figure 16-17 4 much smaller (as shown in Figure 17), interiors of products porosity are substantially mitigated, and product mechanical property will significantly improve.

Further, structure as one preferred, as shown in Figure 5-10, aforementioned disturbance component 6 include being vertically arranged in Disturbing rod 6a in tapping channel 2, disturbance part driving device 7 connect with disturbing rod 6a and it can be driven to make in tapping channel 2 It pumps, wherein when disturbing rod 6a moves to minimum point down in tapping channel 2, bottom end is located at discharge port 2a Top and close discharge port 2a.

It should be noted that in the present invention, disturbance component 6 is not limited to be driven by disturbance part as shown in the figure and fill Its disturbing rod 6a for pumping of 7 drivings is set, for example, it can be the swing rods to swing, furthermore can also be close The micro impeller of discharge port 2a setting melts as long as it can be realized disturbance when moving in tapping channel 2 through what discharge port squeezed out Melt material and it is promoted to carry out the purpose in the filling product corner gap of printing portion toward surrounding flowing.

It is noted that disturbing the fused materials squeezed out through discharge port by the way of disturbing rod 6a up and down motion has Following benefit: during disturbing rod 6a pumps, the intermittent extruded discharge port in the bottom end disturbing rod 6a squeezes out molten Melt material, both realize the purpose for promoting to flow into product printing portion corner position in this way, ensure that the flatness of print surface, It avoids occurring on directly below the discharge opening surface tiny recess (to avoid material excessively wandering toward surrounding, lead to directly below the discharge opening Material thickness is partially thin compared with surrounding, to form arc surfaced pit).

As a kind of preferred embodiment on the basis of disturbance component 3 selects disturbing rod 3a, Fig. 5-10 and Figure 13 institute is seen Show, further includes the feeding-passage 8 being horizontally or diagonally arranged in inside head body 1 in above-mentioned 3D printing spray head, feeding-passage 8 It being connected to above tapping channel 2 and with tapping channel 2, the angle between feeding-passage 8 and tapping channel 2 is right angle or obtuse angle, The top of feeding-passage 8 offers the through-hole 1a for extending upward through head body 1, and the top of disturbing rod 6a is pierced by from through-hole 1a, The size of through-hole 1a and disturbing rod 6a matches and play the guiding role when disturbing rod 6a pumps to it, disturbs part Driving device 7 includes that the crankshaft 7a outside head body 1 and the second power mechanism for driving crankshaft 7a to rotate is arranged in 7b, the top of disturbing rod 6a are rotatably connected on crankshaft 7a, and the second power mechanism 7b includes motor.

Finally, the utility model is also claimed a kind of comprising above-mentioned 3D printing on the basis of aforementioned 3D printing spray head The 3D printer of spray head.

Above-described embodiment is the preferable implementation of the utility model, and in addition to this, the utility model can be with other sides Formula realizes that any obvious replacement is in the protection model of the utility model under the premise of not departing from the technical program design Within enclosing.

In order to allow those of ordinary skill in the art more easily understand the improvement of the utility model compared with the existing technology it Place, some attached drawings of the utility model and description have been simplified, and for the sake of clarity, present specification is omitted one A little other elements, the element that those of ordinary skill in the art should be aware that these are omitted also may make up the interior of the utility model Hold.

Claims (9)

1.3D printing head, including head body (1), head body (1) inner vertical are provided with tapping channel (2), institute The end for stating tapping channel (2) is discharge port (2a), it is characterised in that: further includes baffle (3), baffle (3) connection is useful In driving its Baffle drive device for withdrawing and returning to blocking position (4), when the baffle (3) is located at blocking position, gear exists The lower outer of discharge port (2a), the melted material squeezed out from the discharge port (2a) is during side outward is flowed by baffle (3) stop, so that blocking of the sedimentary printed in profile and the baffle (3) close to the baffle (3) side Face profile matches.

2. 3D printing spray head according to claim 1, it is characterised in that: the baffle (3) is rotatably connected in spray head sheet On body (1), the Baffle drive device (4) includes telescoping cylinder (4a), and the piston rod of the telescoping cylinder (4a) connects baffle (3), Up overturning is simultaneously far from discharge port (2a) for driving baffle (3) when the telescoping cylinder (4a) is shunk, when the telescoping cylinder (4a) extends Driving baffle (3) overturns down and keeps off the lower outer in discharge port (2a).

3. 3D printing spray head according to claim 2, it is characterised in that: the quantity of the telescoping cylinder (4a) is two, institute It states baffle (3) to connect by card ball joint (5) with head body (1), the respective independent control of the telescoping cylinder (4a) owns Baffle (3) are driven when telescoping cylinder (4a) synchronous, and up simultaneously far from discharge port (2a), all telescoping cylinders (4a), which synchronize, stretches for overturning Prolonged driving baffle (3) overturns down and keeps off the lower outer in discharge port (2a), and the telescoping cylinder (4a) is shunk or extended not Drive baffle (3) with card ball joint (5) for node deflection when synchronous.

4. 3D printing spray head according to claim 1, it is characterised in that: the Baffle drive device (4) includes screw rod spiral shell Female secondary and the first power mechanism, the feed screw nut pair include screw rod (4b) and nut (4c), and the head body (1) is equipped with Baffle guide frame for playing the guiding role when baffle (3) move up and down, the top of the baffle (3) is fixedly connected with nut (4c), the first power mechanism connection wire rod (4b) can simultaneously drive screw rod (4b) to rotate, by rotate the screw rod (4b) come Driving nut (4c) moves down or up together with baffle (3), so that corresponding realize allows the baffle (3) to return to blocking position Or it is withdrawn from blocking position.

5. 3D printing spray head according to claim 4, it is characterised in that: first power mechanism is stepper motor or watches Take motor, the power output shaft of the stepper motor or servo motor is connect with screw rod (4b) by shaft coupling.

6. 3D printing spray head described in any one of -5 according to claim 1, it is characterised in that: in the tapping channel (2) Equipped with for promoting melted material after discharge port (2a) extrusion toward the disturbance component (6) of surrounding flowing, the disturbance component (6) It is connected with the disturbance part driving device (7) for driving it to move in tapping channel (2).

7. 3D printing spray head according to claim 6, it is characterised in that: the disturbance component (6) includes being vertically arranged in Disturbing rod (6a) in tapping channel (2), the disturbance part driving device (7) connect with disturbing rod (6a) and it can be driven to go out It pumps in material channel (2), when the disturbing rod (6a) moves to minimum point down in tapping channel (2), Bottom end is located above discharge port (2a) and close to discharge port (2a).

8. 3D printing spray head according to claim 7, it is characterised in that: further include that head body is horizontally or diagonally arranged in (1) internal feeding-passage (8), the feeding-passage (8) are located above tapping channel (2) and are connected to tapping channel (2), institute Stating the angle between feeding-passage (8) and tapping channel (2) is right angle or obtuse angle, is offered above the feeding-passage (8) The through-hole (1a) of head body (1) is extended upward through, the top of the disturbing rod (6a) is pierced by from through-hole (1a), the through-hole The size of (1a) and disturbing rod (6a) matches and play the guiding role when the disturbing rod (6a) pumps to it, Disturbance part driving device (7) includes setting in the external crankshaft (7a) of head body (1) and for driving crankshaft (7a) The second power mechanism (7b) of rotation, the top of the disturbing rod (6a) are rotatably connected on crankshaft (7a), and described second is dynamic Force mechanisms (7b) include motor.

9. the 3D printer comprising 3D printing spray head described in any one of claim 1-8.