CN207758151U

CN207758151U - More nozzle switching devices, 3D printing head and 3D printer

Info

Publication number: CN207758151U
Application number: CN201820048190.8U
Authority: CN
Inventors: 刘晓军
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-01-11
Filing date: 2018-01-11
Publication date: 2018-08-24
Anticipated expiration: 2028-01-11

Abstract

The utility model discloses a kind of more nozzle switching devices, 3D printing head and 3D printers.Actuator is connected to driven member, under the driving effect of actuator, driven member can be rotated around the first default shaft in predetermined angular range, at least two nozzles are connected to driven member, at least two nozzles are around the first pre- centering distribution, first pre- centering is located in the first default shaft, has the first predetermined angle between the reverse extending line of the injection direction of nozzle and the first default shaft, the first predetermined angle is acute angle.As a result, while realizing that more nozzles precisely switch, it can so that overall structure is simple, compact, winding displacement is natural.

Description

More nozzle switching devices, 3D printing head and 3D printer

Technical field

The utility model is related to 3D printing fields, more particularly to a kind of more nozzle switching devices, 3D printing head and 3D Printer.

Background technology

3D printing is a kind of rapid shaping technique, it be one kind based on digital model file, with powdery metal Or the adhesive materials such as plastics, construct the technology of object by layer-by-layer printing.Fused deposition (FDM) technology is current A kind of most widely used 3D printing technique.Its basic principle is that plastic raw materials (being typically plastic wire) are passed through wire feeder It is sent into print head, the major part of print head is a kind of heating extrusion device, and by trunnion, heat block, sprinkler composition, plastic wire is logical After crossing trunnion, into heat block, and liquid is melted to wherein, squeezed out through nozzle, is deposited on print platform, be quickly cooled down shape Molding.Because extrusion device and print platform can do relative motion on horizontal (X, Y) and vertical direction (Z), it is possible thereby to Ensure that plastics can be expressed into any position on print platform.

More colors, more materials mixing printing technique be the research and development focus in 3D printing field, currently, mainly passing through following four Kind mode realizes the mixing printing of more colors, more materials in FDM technology.

One, by multiple wire feeders, multiple material is sent into the same heating extrusion device.A variety of plastic materials exist It mixes after melting in heat block and is squeezed out from nozzle.

Which is mainly used for realizing that the mixing of the multiple color plastics of identical material cannot to achieve the effect that colour mixture Realize the mixing printing of more materials (more materials that especially physical property differs greatly).

Two, using multiple wire feeders by the way that multiple material is sent into same add into the Y-shaped conduit singly gone out more than one Heat block.Different from first way, multiple material is to alternately enter, when switching material the first material by wire feeder from heating It is extracted out in block, second of material enters back into heat block, to realize that the mixing of more materials prints.

The shortcomings that this mixing printing type is, in switching, the first material must completely after being exited in heat block, Second of material can enter, if the fusing point of two kinds of materials is different, in switching, nozzle also needs to be heated or cooled to adapt to material The variation of material, therefore the process switched needs longer time (generally wanting ten seconds or more or even a few minutes).And in switching, It is also slowly being cooled down when the first material is exited from nozzle, heat block, is being easy to stick in inside extrusion mechanism, forming plug.Cause , in switching, inevitable nozzle has the residual of the plastics in melting state in the showerhead for this, therefore when second of material enters extrusion After mechanism, then it can start to continue to print after first all squeezing out the remnants of the first material.Not only have the wave of material The problem of taking, and when the fusing point difference of two kinds of materials, may causing high temperature extrusion that cryogenic material is made to be carbonized.

Three, printer has multiple independent print heads, and a print head is in use, another is waited for outside print platform Life.When being moved synchronously on the same sliding rail or one mobile, another is totally stationary for two print heads or carry.

The shortcomings that this mode is the relationship for not only needing to coordinate two print heads, and correction switches error when print head, Additional radiator is also increased because increasing print head, and reduces the volume in printable space.

Four, multiple nozzles are integrated on single print head.Plastic raw materials are after respective wire feeder from respective spray Head squeezes out.This mode is divided into following several according to the arrangement mode of multiple nozzles：

(1) two nozzle horizontal Tile, sprinkler height are identical；

Side by side, but level height is different for (2) two nozzles；One of nozzle can move up and down relative to another；

(3) swing type nozzle：Two nozzles switch nozzle at an angle, by swinging；

For (1), the arrangement of two nozzle horizontal direction parallels, and position is fixed.To ensure print quality, it is necessary to make two to squeeze The lower end lifted one's head is accurately located at same plane, if the height of nozzle slightly misplaces, will result in when a nozzle operates, second The case where a extruder head scratches to printing objects.

The distance of movable spray head up and down will not only be accurately controlled when switching nozzle for (2), also to correct two The horizontal direction displacement of a nozzle, this is proposed higher want for mechanical precision and the software control of entire print system It asks.

For (3), shuttle-type switching mode does not switch the horizontal displacement that nozzle generates it also requires considering to correct, and Need the stop for solving the problems, such as to swing.

And for above (1)-(3), when the number more than two of nozzle, it is multiple all to increase precision, mechanical structure etc. Polygamy.Such as (2) if in nozzle number more than two, it is necessary to redesign mechanical structure, consider two movable spray heads Independent-lifting；(3) shuttle-type mode is also required to consider the problems of swing and stop in, so that swing is pin-pointed to required Angle, increase the complexity of mechanical structure.

To sum up, existing 3D mixing printing type is more or less problematic in that, therefore there is still a need for a kind of new 3D printings Device.

Utility model content

The same of the mixing printing of more colors, more materials can be being realized the main purpose of the utility model is to provide a kind of When, solve the problems, such as above-mentioned at least one more nozzle switching devices, 3D printing head and 3D printer.

The first aspect according to the present utility model provides a kind of more nozzle switching devices, including：At least two sprays Head；Driven member；And actuator, it is connected to driven member, under the driving effect of actuator, driven member can be around first default turn Axis rotates in predetermined angular range, and at least two nozzles are connected to driven member, and at least two nozzles are around the first pre- centering point Cloth, the first pre- centering is located in the first default shaft, between the reverse extending line of the injection direction of nozzle and the first default shaft With the first predetermined angle, the first predetermined angle is acute angle.

Preferably, driven member includes multiple radial slots, and multiple radial slots are around the second pre- centering distribution, the second pre- centering In the first default shaft, the quantity of radial slot is greater than or equal to the quantity of nozzle, and actuator is equipped at least one and diameter To the matched bolt of slot, actuator is by driving bolt to be inserted into different radial slots with predetermined order, and driving driven member is around first Default shaft rotation.

Preferably, driven member further includes multiple and the spaced inner fovea part of radial slot, and at least one is additionally provided on actuator A and matched male part of inner fovea part, actuator can drive male part to be slided along inner fovea part, and be not inserted into diameter in bolt When to slot, male part is at least partly contacted with inner fovea part.

Preferably, actuator includes the latch feature being used cooperatively and driving part, set in latch feature there are one or it is more A bolt, driving part is for driving the bolt of latch feature to be inserted into different radial slots.

Preferably, driving part is servo motor.

Preferably, driving part is spur rack, and latch feature includes integrated plug pin portion and gear part, plug pin portion and tooth The having the same second default shaft of wheel portion, plug pin portion are equipped with one or more bolts, and the second default shaft is default with first Shaft is parallel, spur rack by with gear part engaged transmission, driving plug pin portion drives bolt around the second default shaft rotation The bolt in portion is inserted into different radial slots.

The second aspect according to the present utility model additionally provides a kind of 3D printing head, including：In conjunction with first side above More nozzle switching devices in face, wherein the posture of more nozzle switching devices is arranged to, and the first default shaft is in vertical direction Second predetermined angle, so that the injection direction of the nozzle to come into operation is straight down.

Preferably, 3D printing head further includes：It is connected to corresponding with the one-to-one heat block of nozzle and trunnion, trunnion Heat block, for printed material to be transported to heat block, heat block is connected to corresponding nozzle, for printed material It is heated, and the printed material after heating is delivered to nozzle；And one or more bearings, for connecting in 3D printing head Rotating part and fixed part, wherein the central shaft of bearing is overlapped with the first default shaft, the conduit being connect with trunnion along Direction arrangement where the central shaft of bearing, conduit are used to printed material being delivered to trunnion.

Preferably, 3D printing head can also include material leakage radical occlusion device, be arranged in at least portion of at least two nozzle The lower section for dividing rotary motion trace, the printed material leaked out for stopping the nozzle not come into operation.

In terms of third according to the present utility model, a kind of 3D printer is additionally provided, including：Rack；Print platform；With And combine the 3D printing head of the second aspect above.

Preferably, rack both sides are respectively equipped with touches needle with predetermined length, is moved to spur rack in 3D printing head and touches Needle is in same horizontal line, and touches under the length direction of needle and the direction unanimous circumstances of spur rack, spur rack can with It touches under the collision effect of needle, driving bolt is inserted into different radial slots, is come into operation with the nozzle for switching different.

More nozzle switching devices, 3D printing head and 3D printer of the utility model precisely switch in the more nozzles of realization While, it can so that overall structure is simple, compact, winding displacement is natural.

Description of the drawings

Disclosure illustrative embodiments are described in more detail in conjunction with the accompanying drawings, the disclosure above-mentioned and its Its purpose, feature and advantage will be apparent, wherein in disclosure illustrative embodiments, identical reference label Typically represent same parts.

Figure 1A to Fig. 1 C shows structural schematic diagram of the switching mechanism of one embodiment of the disclosure under different visual angles.

Fig. 2 shows the structural schematic diagrams of driven member in Figure 1A to Fig. 1 C and plug pin portion.

Fig. 3 shows the structural schematic diagram of the 3D printing head of one embodiment of the disclosure.

Fig. 4 A, Fig. 4 B further illustrate structural schematic diagram of the 3D printing head of the disclosure under different visual angles.

Fig. 5 A show a kind of concrete structure schematic diagram of more nozzle switching devices inside the 3D printing head of the disclosure.

Fig. 5 B show the structural schematic diagram after removal radiator.

Fig. 6 shows the structural schematic diagram for the section components of the disclosure being connect with nozzle.

Fig. 7 shows a kind of fixed structure schematic diagram of thermistor and heating rod.

Fig. 8 shows the structural schematic diagram of the 3D printing head of another embodiment of the disclosure.

Fig. 9 A, Fig. 9 B respectively illustrate 3D printing head nozzle switch in different directions after schematic diagram.

Figure 10 A, Figure 10 B show the internal structure schematic diagram for switching over rear 3D printing head in different directions.

Figure 11 shows the structural schematic diagram of the 3D printer according to one embodiment of the disclosure.

Specific implementation mode

The preferred embodiment of the disclosure is more fully described below with reference to accompanying drawings.Although showing the disclosure in attached drawing Preferred embodiment, however, it is to be appreciated that may be realized in various forms the disclosure without the embodiment party that should be illustrated here Formula is limited.On the contrary, these embodiments are provided so that the disclosure is more thorough and complete, and can be by the disclosure Range is completely communicated to those skilled in the art.

For existing more colors, more materials mixing printing solution there are the problem of, the disclosure is intended to mostly into having more On the basis of switching mode, a kind of more nozzle switching devices, print head and the 3D printer of new rotation formula are proposed.The disclosure More nozzle switching devices while realizing that more nozzles precisely switch, can so that overall structure is simple, compact, winding displacement from So.

Also, the structure based on more nozzle switching devices that disclosure specific embodiment further describes, in switching nozzle When, the direction of the nozzle to come into operation after switching is identical as the direction of the nozzle to come into operation before, is not likely to produce displacement, theoretical On handover operation completion the position of the nozzle after switching need not be modified.And after nozzle switching in place, Ke Yizhi It is dynamic, it will not be because of bumping against print platform or printout loses its position having.Switching mode is simple, and when switching need not also drive There is dynamic component very high mechanical movement precision, allowable error can reach 1-2 millimeters.

The structure of more nozzle switching devices of the disclosure is illustrated first below.

【More nozzle switching devices】

Briefly, more nozzle switching devices of the disclosure mainly include a driven member, an actuator and it is multiple (at least Two) nozzle.

Actuator is connected to driven member, and under the driving effect of actuator, driven member can be around the first default shaft pre- Determine rotation in angular range.Predetermined angular range may be set according to actual conditions, and theoretically, predetermined angular range can be set It is set to, during driven member is rotated around the first default shaft in the predetermined angular range, can realize this multiple nozzle Rotation.

Multiple nozzles are connected to driven member, and multiple nozzles, preferably can be predetermined around first around the first pre- centering distribution The center of circle is uniformly distributed, and the central angle that two neighboring nozzle and the first pre- centering are constituted is preferably 45 °.First predetermined circle The heart is located in the first default shaft, has the first pre- clamp between the reverse extending line of the injection direction of nozzle and the first default shaft Angle.I.e. multiple nozzles can be considered as around the first default shaft annular spread.Wherein, multiple nozzles are around the first default shaft annular point Cloth refers to multiple nozzles around the first pre- centering distribution.Each there is between nozzle and the first default shaft the first predetermined angle, First predetermined angle is preferably acute angle, such as can be 15 °, can so make the compact-sized of more nozzle switching devices, Winding displacement is more natural.

As an example it is assumed that the angle between the reverse extending line of the injection direction of nozzle and the first default shaft is 90 °. It is contemplated that after more nozzle switching devices are mounted in 3D printer, in order to enable the injection side of the nozzle to come into operation To straight down, the first default shaft will be horizontally disposed with, thus connect with nozzle trunnion, conduit (hose), wire feeder then It certainly will need to arrange straight up, the wiring of the conduit that with the trunnion of each nozzle connect a fairly large number of in nozzle It is inevitably generated bending, thus, which one is that winding displacement is not compact, second is that the bending of conduit easily causes (strip) printing material Material cannot successfully be sent into trunnion.

And the disclosure is by by the first pre- clamp between the reverse extending line of the injection direction of nozzle and the first default shaft Angle is set as acute angle (such as 15 °), after more nozzle switching devices are mounted in 3D printer, the first default shaft can with it is perpendicular Histogram can so make the nozzle to come into operation to the second predetermined angle (preferably identical as the first predetermined angle) Straight down, the height for the nozzle not come into operation is higher than the nozzle to come into operation to injection direction.

And in winding displacement, the conduit being connect with the trunnion of each nozzle can be carried out along the direction of the first default shaft Setting, can so make winding displacement it is compact, naturally, being not in largely to be bent so that printed material can be through leading Pipe is normally delivered to trunnion.Further, the heat block that is connect with each nozzle, trunnion, the conduit that is connect with trunnion can be with Around the first default shaft rotation, the Movement consistency of nozzle and the part being connect with nozzle thus can also be kept.

More nozzle switching devices of the disclosure are being applied to 3D printing, as being mounted in 3D printer as 3D printing head Afterwards, the posture of more nozzle switching devices can be arranged to, and the first default shaft is in the second predetermined angle with vertical direction, so that The injection direction for the nozzle that must be come into operation is straight down.Wherein, the second predetermined angle can be equal to first addressed above Predetermined angle.For example, when the first predetermined angle is 15 °, the second predetermined angle may be 15 °.

As a result, when more nozzle switching devices of the disclosure are applied to 3D printing, multiple nozzles are around the first default shaft Rotary motion trace be circular arc that one and horizontal plane have certain angle, the extreme lower position of circular arc is the nozzle institute come into operation Position, the injection direction of nozzle is straight down in the position.When switching nozzle, it is only necessary to the spray that expectation is come into operation Head is switched to the position (i.e. circular arc minimum point).And the nozzle not come into operation is above the nozzle to come into operation, therefore Be not in that other nozzles not come into operation scratch to printing objects when carrying out nozzle handover operation in print procedure Situation.

In practical applications, leave unused nozzle (nozzle not come into operation) and use nozzle (nozzle to come into operation, Nozzle i.e. straight down) difference in height can control in grade, i.e., the difference in height only needs to have at 1 millimeter or so Effect avoids scratching.As a result, when multiple nozzles are arranged based on the difference in height, the occupied space of more nozzles can be reduced so that more Nozzle structure is more compact, and can increase the transformation for the nozzle that can be arranged.

Preferably, multiple nozzles can be evenly arranged around the first pre- centering, and the first pre- centering is located at first and presets In shaft.As a result, using driven member around the first default shaft rotation realize nozzle switching when, can control driven member with Fixed rotational angle is rotated, so that the nozzle after switching can be located exactly at the nozzle institute come into operation before switching in place It sets, the position of the nozzle after switching can need not be so modified again, and directly continue to beat using the nozzle after switching Print.

So far, the basic structure and operation principle of more nozzle switching devices of the disclosure are briefly explained.According to upper Text description is it is found that more nozzle switching devices of the disclosure include mainly multiple nozzles and cut by what actuator and driven member were constituted Converting mechanism.Wherein, nozzle can be various nozzles used in the prior art, be just made of below actuator and driven member emphatically The concrete structure of switching mechanism be described further.

Theoretically, switching mechanism can be any device for capableing of pivoting, such as rotating disc.One as the disclosure Sheave structure may be used in preferable example, switching mechanism, you can to use Geneva mechanism (Geneva Drive) to realize nozzle Switching.When just realizing the switching of nozzle using Geneva mechanism below, the concrete structure of more nozzle switching devices is described further.

Specifically, driven member may include multiple radial slots, and multiple radial slots can be distributed around the second pre- centering, the Two pre- centering are located in the first default shaft, and the quantity of radial slot can be greater than or equal to the quantity of nozzle.It is set on actuator There are at least one and matched bolt of radial slot, actuator to be driven by driving bolt to be inserted into different radial slots with predetermined order Dynamic driven member is around the first default shaft rotation.As a result, actuator by drive bolt be inserted into different radial slots can make from Moving part, so as to drive the rotation of nozzle, realizes the switching of nozzle around the first default shaft rotation.

Preferably, driven member can also include the multiple and spaced inner fovea part of radial slot, and inner fovea part can be used for spraying The stop of head, is also provided on actuator at least one with the matched male part of inner fovea part, and actuator can drive male part It is slided along inner fovea part, and when bolt is not inserted into radial slot, male part is at least partly contacted with inner fovea part.

As a result, after completing nozzle switching, bolt will leave radial slot, and in the male part and driven member on actuator Inner fovea part contact, it is driven under the action of male part in this way, the inner fovea part of driven member blocks the male part in driven member Part and the nozzle that is connect with driven member can stop immediately, will not occur nozzle bumps against print platform or printout Displacement, therefore its position having will not be lost.And switching mode is simple, and handover operation does not need very high machinery fortune yet Dynamic precision.

Further, actuator may include the latch feature being used cooperatively and driving part, can be set in latch feature There are one or multiple bolts, driving part is by driving the bolt of latch feature to be inserted into different radial slots, such as with predetermined suitable Sequence is inserted into different radial slots, you can realizes the rotation of multiple nozzles, that is, realizes the switching of multiple nozzles.Wherein driving part can To be servo motor, you can in addition can also be other driving mechanisms, herein to drive the rotation of latch feature by servo motor It wouldn't repeat.

So far, when using sheave groove structure with regard to switching mechanism, the basic structure and operation principle of driven member and actuator are done Brief description, with reference to specific embodiment does further exemplary illustration with regard to the concrete structure of all parts.

Figure 1A to Fig. 1 C shows the switching mechanism (i.e. driven member and actuator) of one embodiment of the disclosure in different visual angles Under structural schematic diagram.

The multiple radial slots 111 of setting and inner fovea part 113, inner fovea part can be spaced referring to Figure 1A to Fig. 1 C, on driven member 11 113 inner wall can be the circular arc of the indent with one fixed width.

Actuator may include driving part and latch feature, and spur rack 21 may be used in driving part, and latch feature can To include integrated plug pin portion 41 and gear part 31.Plug pin portion 41 and 31 shaft having the same of gear part are (for the ease of area Point, the referred to herein as second default shaft), the second default shaft is parallel with the first default shaft of driven member 11.

Referring to Fig. 2, it is (i.e. matched convex with radial slot 111 that two symmetrical bolts 411 are respectively equipped in plug pin portion 41 Rise) and two symmetrical male parts 412, male part 412 match with inner fovea part 113.Male part 412 can be outside The secter pat of protrusion, male part 412 can be slided along the inner fovea part 113 on driven member 11, and in male part 412 along interior During recess portion 113 slides, the movement of inner fovea part 113 will not be caused.In addition, being slided into inner fovea part 113 in male part 412 When, inner fovea part 113 will be blocked by male part 412.

Gear part 31 is the gear to match with spur rack 21.Spur rack 21 can by with the engaged transmission of gear part 31, It drives plug pin portion 41 around the second default shaft rotation, and then the bolt 411 of plug pin portion 41 is driven to be inserted into different radial slots 111. By being inserted into different radial slots 111, the rotation of driven member 11 may be implemented, so as to drive the spray being connect with driven member 11 The rotation of head (not shown), realizes the switching of nozzle.

As a result, in plug pin portion 41 as gear part 31 is in the second default shaft rotation process, and if only if plug pin portion 41 Bolt 411 when being inserted into the radial slot 111 of driven member 11, driven member 11 can rotate with the rotation of plug pin portion 41.Work as bolt After 411 produce radial slot 111, male part 412 will contact (as shown in Figure 2) with inner fovea part 113, and inner fovea part 113 is by male part 412 Block so that driven member 11 can stop immediately, until the bolt 411 of plug pin portion 41 is transferred to radial slot 111 again.Due to multiple Nozzle connect with driven member 11 and (is fixedly connected), thus male part 412 block effect under, the nozzle that is connected with driven member 11 It also can stop immediately.

As described above, multiple nozzles are around the first pre- centering distribution, and multiple radial slots 111 are around the second pre- centering point Cloth, the first pre- centering and the second pre- centering are in the first default shaft.In the disclosure, it is preferable that multiple nozzles around First pre- centering is uniformly distributed, and multiple radial slots 111 are uniformly distributed around the second pre- centering, and two neighboring nozzle and The central angle of one pre- centering construction can be equal with the central angle that second center of circle constructs with two neighboring radial slot.

As a result, after the bolt 411 of plug pin portion 41 is transferred to the radial slot 111 of driven member 11, the rotation of nozzle may be implemented, After bolt 411 leaves radial slot 111, the inner fovea part 112 of driven member 11 can be blocked by male part 412 so that moving part 11 Stop immediately.In this way, can make after the switching for completing nozzle, the position of the nozzle currently to come into operation can be located exactly at The nozzle position come into operation before switching, and can make nozzle stop immediately, even if to bump against printing flat for nozzle at this time Platform or printout will not be subjected to displacement, therefore will not lose its position having.Further, in the switching for completing nozzle Afterwards, even if spur rack 21 continues that gear part 31 is driven to rotate, as long as under the rotation cannot drive the bolt 411 of plug pin portion 41 to be inserted into One radial slot 111, would not cause the variation of the position of nozzle.It (spur rack 21, gear part 31 and inserts as it can be seen that actuator Pin portion 41) continuous rotation can be converted driven member 11 when it is dynamic when the intermittent rotary that stops, in the driving precision to actuator In the case of of less demanding, you can to realize the accurate switching of nozzle.

So far, in conjunction with attached drawing (Figure 1A-Fig. 1 C and Fig. 2) with regard to a kind of concrete structure of more nozzle switching devices of the disclosure It elaborates, it should be noted that be the explanation carried out as driving part using spur rack, the spur rack 21 in figure above It can be replaced by other driving mechanisms such as servo motor, i.e., can also remove gear part 31, and directly driven by servo motor slotting Pin portion 41 is around the second default shaft rotation.It is so known to one of skill in the art, it, can be under the technical concept of the disclosure There are other a variety of type of drive, details are not described herein again.

【3D printing head】

The disclosure also proposed a kind of 3D printing head, may include the more nozzle switching devices addressed above.By 3D When print head is come into operation as being installed in 3D printer, the posture of more nozzle switching devices should be arranged to, and first is pre- If shaft is in the second predetermined angle with vertical direction, so that the injection direction of the nozzle to come into operation is straight down.Wherein, it closes Related description above is may refer in the posture setting of more nozzle switching devices, details are not described herein again.

Referring to Fig. 3, multiple bearings can be used, first bearing 611 as illustrated in the diagram, base member 613 and the Two bearings 615, base member 613 are mainly used for connecting first bearing 611 and second bearing 615, and base member 613 can be with It is hollow structure, and central shaft can be with first bearing 611, the center overlapping of axles of second bearing 615.

The rotating part in 3D printing head can be connect with fixed part by first bearing 611, second bearing 615 Come, entire 3D printing head is connected as an entirety, global shape can be designed to bearing shape shown in Fig. 2.Each bearing Central shaft can preferably be overlapped with the first default shaft, can so improve integrally-built stability.Wherein, rotation section Point may include nozzle, heat block, trunnion, conduit, and for the description below in conjunction with Fig. 5 A it is found that rotating part can be with Including radiator.Fixed part can be other components such as conducting wire, fan etc. in 3D printing head.

Specifically, each nozzle 51 can also connect a heat block 519, each heat block 519 connects a trunnion (not shown).Trunnion is used to printed material being transported to heat block 519, and heat block 519 is for adding printed material Heat, and the printed material after heating is delivered to its corresponding nozzle 51.The conduit being connect with trunnion (can be a hose, scheme In be not shown) can be arranged along the direction where the central shaft (can be the first default shaft) of bearing, conduit will be for will beat Print material is delivered to trunnion.Thread feeding mechanism can also be connected outside conduit, details are not described herein again.

Nozzle 51, heat block 519, trunnion and conduit can the (rotation sections addressed above as a whole as a result, Point) rotated along the first default shaft, and winding displacement is compact, and overall structure is simple.In addition, other connections that 3D printing head includes Line such as conducting wire can be arranged along the central shaft of bearing.

Referring to Fig. 4 A, Fig. 4 B, the 3D that the disclosure is may be mounted above in association with Figure 1A to Fig. 1 C switching mechanisms described is beaten In print machine, to realize agreeing with for nozzle.Wherein, it has been elaborated above about the structure of each section, it is no longer superfluous herein It states.

Fig. 5 B show the structural schematic diagram after removal radiator.

As shown in Fig. 5 A, Fig. 5 B, radiator 71 can be utilized multiple nozzles (such as three nozzles 51 shown in figure) It is connect with driven member 11.Wherein, radiator 71 can be made of multi-layer heat dissipation piece.

Specifically, radiator 71 can respectively with multiple nozzles 51, with the heat block 519, corresponding of each nozzle connection Trunnion and conduit connection, and radiator 71 can also be connect by disk 81 with driven member 11.Radiator 71, more as a result, A nozzle 51, with each nozzle connection heat block 519, corresponding trunnion and conduit can as a whole, with from The rotation of moving part 11 and around the first default shaft rotation.

In addition, as shown in Fig. 5 A, Fig. 5 B, driven member 11 can be designed as semicircle dish structure, can be spaced and set on semi-disc Set multiple radial slots 111 and inner fovea part 113.Multiple nozzles 51 can be arranged in the lower section of another semi-disc of semi-disc, and can To be uniformly arranged around the first pre- centering.Also, the central angle between adjacent nozzle 51 and the first pre- centering can be equal to phase Central angle between adjacent radial slot 111 and the second pre- centering.The corresponding rotational angle of rotation every time etc. of driven member 11 as a result, In the angle needed for the switching of adjacent nozzle, so that the position after nozzle switching is located exactly at the position before switching.

Referring to Fig. 6, each nozzle (not shown) can connect a heat block 519, and heat block 519 connects with trunnion 513 It connects.Thermistor 518 and heating rod 517 can be equipped in heat block 519.Thermistor 518 connects with thermal resistor wire 511 It connects, heating rod 517 is connect with heating rod conducting wire 515.It preferably, can be with a screw 520 simultaneously by thermistor 518 and heating Stick 517 is fixed.

As shown in fig. 7, hole 512, hole 516 and hole 514 can be equipped on heat block.Thermistor may be mounted at hole In 512, heating rod 517 may be mounted in hole 516, and trunnion 513 may be mounted in hole 514.A lock screw can be utilized 520 simultaneously (can be hexagon socket head cap screw) heating rod and thermistor are locked.

Fig. 8 shows the part-structure schematic diagram of the 3D printing head of another embodiment of the disclosure.

Referring to Fig. 8, it is also provided with material leakage radical occlusion device in the lower section of nozzle 51, such as the baffle 521 in figure, can be used for Block the printed material that the nozzle not come into operation leaks out.Herein it should be noted that in practical applications, multiple nozzles 51 Rotary motion trace is a fixation locus, therefore material leakage radical occlusion device can be arranged in the lower section of at least partly rotary motion trace, be used for Receive the printed material that the nozzle not come into operation leaks out, shadow caused by the clout leaked out to avoid the nozzle not come into operation It rings.

By taking more nozzle switching devices are above in association with the structure described in Figure 1A to Fig. 1 C as an example, the possible position of multiple nozzles It is multiple fixed positions, therefore material leakage radical occlusion device (i.e. baffle 521 in figure) can be preferably provided in removal operating position (i.e. Lowest point) except every other possible position lower section.That is, the rotation in idle nozzle can be arranged in material leakage radical occlusion device Below track.

Figure 10 A, Figure 10 B show the internal structure schematic diagram after switching in different directions.

Wherein each component shown in figure may refer to related description above, and details are not described herein again.According to Fig. 9 A, Fig. 9 B, Figure 10 A, Figure 10 B can see, and the nozzle to come into operation after switching is not blocked by material leakage radical occlusion device (i.e. baffle 521 in figure), The nozzle not come into operation is blocked by material leakage radical occlusion device (i.e. baffle 521 in figure).Also, the nozzle not come into operation is higher than throwing Enter the nozzle used, and the position of the nozzle to come into operation after switching is constant.

So far, the structure of the 3D printing head of the disclosure is described in conjunction with Fig. 3 to Figure 10 B.In addition, the 3D of the disclosure is beaten It can also includes other components possessed by existing 3D printing head, such as radiating block, wire feeder to print head, no longer gone to live in the household of one's in-laws on getting married here It states.

Referring to Figure 11, printer may include mainly rack 2, print platform 3 and 3D printing head 1.Wherein, 3D printing head 1 can be above in association with 3D printing head described in Fig. 3 to Fig. 7.

3D printing head can be under the control action of control mechanism (not shown), along two axis of travel (X-axis, Y Axis) it advances, to be moved to the corresponding position of 3 top of print platform, printed.Wherein, in multilayer print procedure, Ke Yishi Print platform 3 moves down, and can also be that 3D printing head moves up.

As shown in figure 11,2 both sides of rack can be respectively equipped with touches needle 211 with predetermined length.Include in 3D printing head 1 It, can be real by touching the cooperation of needle 211 and spur rack 21 in the case of above in association with the switching construction shown by Figure 1A to Fig. 1 C The switching of existing nozzle.

Specifically, it is moved to spur rack 21 in 3D printing head 1 and touches needle 211 and be in same horizontal line, and touch needle 211 Length direction it is consistent with the direction of spur rack 21 when, with continuing to move to for 3D printing head 1, spur rack 21 can with touch needle 211 contacts (collision), so in spur rack and under touching the collision effect of needle 211, so that it may to drive bolt to be inserted into different radial directions Slot is come into operation with the print head for switching different.Wherein, by contact rack 2 both sides it is different touch needle 211,3D can be controlled Print head 1 switches nozzle according to different rotation directions.It is wherein the prior art about the mobile realization method of 3D printing head, this Place repeats no more.

More nozzle switching devices, 3D printing head and the 3D according to the disclosure are above described in detail by reference to attached drawing Printer.

Each embodiment of the utility model is described above, above description is exemplary, and non-exclusive, and And it is also not necessarily limited to disclosed each embodiment.Without departing from the scope and spirit of illustrated each embodiment, for Many modifications and changes will be apparent from for those skilled in the art.The choosing of term used herein It selects, it is intended to best explain the principle, practical application or the improvement to the technology in market of each embodiment, or this technology is made to lead Other those of ordinary skill in domain can understand each embodiment disclosed herein.

Claims

1. a kind of more nozzle switching devices, which is characterized in that including：

At least two nozzles；

Driven member；And

Actuator is connected to the driven member, and under the driving effect of the actuator, the driven member can be default around first Shaft rotates in predetermined angular range, and at least two nozzle is connected to the driven member, at least two nozzle around First pre- centering distribution, the first pre- centering are located in the described first default shaft, the injection direction of the nozzle There is the first predetermined angle, the first predetermined angle is acute angle between reverse extending line and the first default shaft.

2. more nozzle switching devices according to claim 1, which is characterized in that

The driven member includes multiple radial slots, and the multiple radial slot is around the second pre- centering distribution, the described second predetermined circle The heart is located in the described first default shaft, and the quantity of the radial slot is greater than or equal to the quantity of the nozzle,

The actuator is equipped at least one and matched bolt of the radial slot, and the actuator, which passes through, drives the bolt It is inserted into different radial slots with predetermined order, drives the driven member around the described first default shaft rotation.

3. more nozzle switching devices according to claim 2, which is characterized in that

The driven member further includes multiple and the spaced inner fovea part of the radial slot,

At least one and matched male part of the inner fovea part is additionally provided on the actuator, the actuator can drive described Male part is slided along the inner fovea part, and when the bolt is not inserted into the radial slot, the male part with it is described interior Recess portion at least partly contacts.

4. more nozzle switching devices according to claim 2 or 3, which is characterized in that

The actuator includes the latch feature being used cooperatively and driving part,

The latch feature is equipped with one or more bolts,

The driving part is for driving the bolt of the latch feature to be inserted into different radial slots.

5. more nozzle switching devices according to claim 4, which is characterized in that

The driving part is spur rack, and the latch feature includes integrated plug pin portion and gear part, the plug pin portion and The having the same second default shaft of the gear part, the plug pin portion be equipped with one or more of bolts, described second Default shaft is parallel with the described first default shaft,

The spur rack by with gear part engaged transmission, drive the plug pin portion around the described second default shaft rotation, And then the bolt of the plug pin portion is driven to be inserted into different radial slots.

6. a kind of 3D printing head, which is characterized in that including：

More nozzle switching devices described in any one of Claims 1-4, wherein

The posture of more nozzle switching devices is arranged to, and the first default shaft is in the second pre- clamp with vertical direction Angle, so that the injection direction of the nozzle to come into operation is straight down.

7. 3D printing head according to claim 6, which is characterized in that further include：

With the one-to-one heat block of the nozzle and trunnion, the trunnion is connected to corresponding heat block, for that will beat Print material is transported to the heat block, and the heat block is connected to corresponding nozzle, for being carried out to the printed material Heating, and the printed material after heating is delivered to the nozzle；And

One or more bearings, for connecting rotating part and fixed part in the 3D printing head, wherein it is one or The central shaft of multiple bearings is overlapped with the described first default shaft, the conduit being connect with the trunnion along the bearing center Direction arrangement where axis, the conduit are used to the printed material being delivered to the trunnion.

8. 3D printing head according to claim 6, which is characterized in that further include：

Material leakage radical occlusion device is arranged in the lower section of at least partly rotary motion trace of at least two nozzle, is not thrown for stopping Enter the printed material that the nozzle used leaks out.

9. a kind of 3D printer, which is characterized in that including：

Rack；

Print platform；And

3D printing head described in any one of claim 6 to 8.

10. 3D printer according to claim 9, which is characterized in that

The 3D printing head includes more nozzle switching devices described in claim 5,

The rack both sides are respectively equipped with touches needle with predetermined length,

It is moved to the spur rack in the 3D printing head and is in same horizontal line, and the length for touching needle with the needle that touches Under the direction unanimous circumstances of direction and the spur rack,

The spur rack can with it is described touch the collision effect of needle under, drive the bolt to be inserted into different radial slots, to cut Different nozzles is changed to come into operation.