CN114147963A

CN114147963A - 3D printer is with beating printer head

Info

Publication number: CN114147963A
Application number: CN202111445651.8A
Authority: CN
Inventors: 黄辉平; 张淑莲
Original assignee: Mingda Technology Co ltd
Current assignee: Mingda Technology Co ltd
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2022-03-08
Anticipated expiration: 2041-11-30
Also published as: CN114147963B

Abstract

The application relates to a printing head for a 3D printer, which comprises a printing seat, a conveying mechanism and a printing mechanism, wherein the conveying mechanism is arranged on the printing seat and used for conveying materials, and the printing mechanism is arranged on the printing seat and used for melting and printing the materials; print the seat including the base, set up in the installation roof-rack of base one side and set up in the mount pad of installation roof-rack, the installation roof-rack is provided with the feeding guide holder that is located the conveying mechanism top and passes through in order to supply the material, the mount pad has the installation cavity, thereby conveying mechanism rotates the drive assembly who carries to the material including rotating the drive roll, the rotation of connecting in the mount pad in the driven voller and drive roll and the drive roll of mount pad, the liquid flow channel that supplies the coolant liquid to pass through is all seted up to drive roll and driven voller, it is provided with the infusion subassembly to the liquid flow channel transport coolant liquid to print the seat. This application has the effect that improves the radiating effect who beats printer head.

Description

3D printer is with beating printer head

Technical Field

The application relates to the technical field of 3D printing, in particular to a printing head for a 3D printer.

Background

The currently commonly used fdm (fused Deposition modeling) 3D printer adopts a fused Deposition manufacturing process, adopts thermoplastic materials such as ABS and nylon, and adopts strip-shaped thermoplastic materials for feeding. The printing head is provided with a nozzle for heating and melting the material and a pair of conveying rollers which are rotatably connected with the printing head and are positioned above the nozzle so as to convey the material to the nozzle, a gap for the material to pass through is formed between the two conveying rollers and is abutted against the material, the nozzle moves along the section contour and the filling track of the part and simultaneously extrudes the melted material, and the material is rapidly solidified and coagulated with the surrounding material, so that the required structure is formed.

With respect to the related art among the above, the inventors consider that the following drawbacks exist: the printer head of the existing 3D printer has poor heat dissipation effect in actual work, heat is transferred to the conveying roller, so that the material between the two conveying rollers is melted, and the partially melted material is easily adhered to the conveying roller to influence the normal work of the conveying roller, so that the improvement is needed.

Disclosure of Invention

In order to improve the radiating effect who beats printer head, this application provides a 3D printer is with beating printer head.

The application provides a 3D printer is with beating printer head adopts following technical scheme:

a printing head for a 3D printer comprises a printing seat, a conveying mechanism arranged on the printing seat and used for conveying materials, and a printing mechanism arranged on the printing seat and used for melting and printing the materials; print the seat including the base, set up in the installation roof-rack of base one side and set up in the mount pad of installation roof-rack, the installation roof-rack is provided with the feeding guide holder that is located the conveying mechanism top and passes through in order to supply the material, the mount pad has the installation cavity, thereby conveying mechanism rotates the drive assembly who carries to the material including rotating the drive roll, the rotation of connecting in the mount pad in the driven voller and drive roll and the drive roll of mount pad, the liquid flow channel that supplies the coolant liquid to pass through is all seted up to drive roll and driven voller, it is provided with the infusion subassembly to the liquid flow channel transport coolant liquid to print the seat.

Through adopting above-mentioned technical scheme, be provided with the liquid channel that flows that infusion subassembly lets in the coolant liquid to drive roll and driven voller to cooling down to drive roll and driven voller, effectively reducing the material and being heated the possibility of adhesion in drive roll and driven voller surface, and effectively reduce the material and be heated the possibility that melts and cause the putty in drive roll and driven voller department.

Preferably, the print seat is still including setting up in the protective housing who establishes in order to install roof-rack and mount pad cover in the base, the infusion subassembly includes cooling tank, first liquid pipe and the second liquid pipe that supplies the coolant liquid to store, the cooling tank is installed in protective housing, the both ends of drive roll and driven voller are all rotated and are connected with rotary joint, first liquid pipe and second liquid pipe all are provided with two, the one end of one of them first liquid pipe is connected in the rotary joint of cooling tank and other end connection in drive roll one end, the one end of one of them second liquid pipe is connected in the rotary joint of cooling tank and other end connection in the drive roll other end, the one end of another first liquid pipe is connected in the rotary joint of cooling tank and other end connection in driven voller one end, the one end of another second liquid pipe is connected in the rotary joint of cooling tank and other end connection in the driven voller other end.

Through adopting above-mentioned technical scheme, be provided with the protective housing, improve the security of beating printer head work, the coolant liquid of cooler bin gets into in the liquid flow channel of drive roll and driven voller through first liquid pipe to carry out cooling to drive roll and driven voller, the coolant liquid after the absorption heat is arranged to the cooler bin through the second liquid pipe and is carried out recirculation.

Preferably, the drive assembly includes that the rotation is connected in the driving shaft of installation cavity, drive driving shaft pivoted driving motor, coaxial fixed cover locate the first driving gear of driving shaft, coaxial fixed cover locate the drive roll and mesh in the first driven gear of first driving gear, coaxial fixed cover locate the second driving gear of drive roll and coaxial fixed cover locate the driven voller and mesh in the second driven gear of second driving gear.

Through adopting above-mentioned technical scheme, driving motor rotates and drives the driving shaft and rotate, realizes the synchronization of drive roll and driven voller and rotates towards relative direction through first driving gear, first driven gear, second driving gear and second driven gear.

Preferably, the printing mechanism comprises a throat pipe fixedly connected to the mounting seat, a nozzle connected to the lower portion of the throat pipe, and a heating block for heating the throat pipe, the mounting seat is fixedly connected with a heat insulation sleeve, the throat pipe is coaxially and fixedly arranged in the heat insulation sleeve in a penetrating mode, and a heat dissipation block is fixedly arranged in the middle of the throat pipe in a fixing mode.

Through adopting above-mentioned technical scheme, the heating block heats the choke to melting the material that gets into in the choke, the material after the melting is printed the shaping by the nozzle blowout, and mount pad fixedly connected with radiation housing reduces the heat transfer of choke to the possibility of mount pad, drive roll and driven voller, and the fixed cover in middle part of choke is equipped with the radiating block, increases heat radiating area.

Preferably, the mounting base is fixedly connected with a first cooling fan for blowing and radiating the mounting cavity.

Through adopting above-mentioned technical scheme, add and be equipped with first cooling fan, reduce the heat and gather in the installation cavity, further reduce the material and be heated at drive roll and driven voller department and melt the possibility that causes the putty.

Preferably, the mounting base is fixedly connected with a second cooling fan, an air outlet of the second cooling fan is connected with an air guide pipe, and an air outlet of the air guide pipe is aligned with the nozzle.

Through adopting above-mentioned technical scheme, second cooling fan can be accurate dispel the heat to the model of having printed, improves printing quality.

Preferably, the mounting seat comprises a mounting main seat and a movable auxiliary seat which are fixedly connected to the mounting top frame, a charging hole communicated with the mounting cavity is formed in one side of the mounting main seat, the movable auxiliary seat is hinged to the mounting main seat to control the charging hole to be opened and closed, a fixing mechanism is arranged between the movable auxiliary seat and the mounting main seat to enable the free end of the movable auxiliary seat to be detachably connected to the mounting main seat, the driving roller is rotatably connected to the mounting main seat, and the driven roller is rotatably connected to the movable auxiliary seat.

By adopting the technical scheme, when the materials need to be filled, the locking of the free end of the movable auxiliary seat by the fixing mechanism is released, the free end of the movable auxiliary seat is overturned to enable the charging hole to be in an open state, the materials extending into the mounting cavity are placed on the driving roller, the lower end of the materials extends into the throat pipe, the movable auxiliary seat is overturned to enable the driven roller to approach close to the driving roller, the driving roller and the driven roller clamp the materials, and the free end of the movable auxiliary seat is locked by the fixing mechanism to complete the charging.

Preferably, the mounting main seat is provided with a limiting hole, and the fixing mechanism comprises a sliding limiting rod penetrating the movable auxiliary seat, a mounting plate fixedly connected to the limiting rod and located outside the movable auxiliary seat, and a first elastic member fixedly connected between the movable auxiliary seat and the mounting plate to force the limiting rod to be inserted into the limiting hole.

Through adopting above-mentioned technical scheme, before overturning the vice seat of activity, need apply the effort towards keeping away from spacing hole direction to the gag lever post, make the gag lever post tip slide and break away from out the spacing hole, the elastic component has the elastic deformation of taking place and has elastic potential energy this moment, the staff overturns the free end of the vice seat of activity, after the material is filled, the free end of the vice seat of reverse upset activity is preceding, the staff need be to lasting applying the effort to the gag lever post, when the vice seat butt of activity behind the installation main base, remove the effort, first elastic component elasticity resets and forces the gag lever post to slide and insert and locate spacing hole, realize the lock solid.

Preferably, the lateral wall fixedly connected with of the vice seat of activity is located the otic placode of gag lever post top, and the vice seat of activity is provided with the unlocking plate, and the unlocking plate passes through the articulated shaft and articulates in the otic placode, and the mounting panel slides along vertical and is connected with the slider, and the one end of unlocking plate articulates in the slider, and the top of unlocking plate is close to the top of the vice seat of activity.

Through adopting above-mentioned technical scheme, when needs seal the charging hole, staff's forefinger and middle finger support the vice seat of activity, the thumb butt is in the unlocking plate, thereby realize snatching the free end of the vice seat of activity, press down unlocking plate one end simultaneously, make the one end of unlocking plate rotate towards being close to the vice seat direction of activity, the other end of unlocking plate is around the articulated shaft axis towards antiport, thereby drive the gag lever post towards keeping away from spacing hole direction and slide and break away from in spacing hole, when the vice seat butt of activity behind the installation main tributary, remove the effort, first elastic component elastic reset forces the gag lever post to slide and insert and locate spacing hole, realize the lock solid, and convenient operation.

Preferably, the roof of installation primary seat is seted up and is communicated in the feed inlet that the installation cavity passes through in order to supply the material, the roof of installation primary seat is seted up and is communicated in the chamber of sliding of feed inlet, and the chamber of sliding communicates in spacing hole, and the installation primary seat is provided with to slide and connects in the fly leaf in the chamber of sliding, and the through-hole that supplies the material to pass through is seted up to the fly leaf, be provided with the second elastic component between the intracavity wall of sliding and the fly leaf, the gag lever post is inserted and is located spacing hole after, and the gag lever post butt forces the fly leaf to slide in the lateral wall of fly leaf and makes the through-hole and the feed inlet of fly leaf be in just to the state, and the elastic deformation takes place for the second elastic component this moment, and the elastic force of second elastic component is less than the elasticity threshold value of first elastic component.

Through adopting above-mentioned technical scheme, when needs feed, pass the feed inlet with the lower extreme of material and pass the through-hole of fly leaf earlier, slide when the gag lever post and break away from out the spacing hole after, second elastic component elasticity resets and forces the fly leaf to slide a short distance, make the fly leaf exert certain clamp force to the material, at this moment, the staff need exert the effort to the material and just can stimulate material downwardly extending, on the one hand, reduce the overlength that the staff pulled the material, lead to piling up the possibility of material in the choke, on the other hand, fix in advance the material, reduce the possibility that the material took place to rock.

In summary, the present application includes at least one of the following beneficial technical effects:

the cooling liquid is introduced into the liquid flowing channels of the driving roller and the driven roller by the liquid conveying assembly, so that the driving roller and the driven roller are cooled, the possibility that materials are heated and adhered to the outer surfaces of the driving roller and the driven roller is effectively reduced, and the possibility that the materials are heated and melted at the driving roller and the driven roller to cause material blockage is effectively reduced;

the second cooling fan can accurately dissipate heat of the printed model, so that the printing quality is improved;

when needs feed, pass the feed inlet with the lower extreme of material earlier and pass the through-hole of fly leaf, after the gag lever post slided and breaks away from out the spacing hole, second elastic component elasticity resets and forces the fly leaf to slide a short distance, make the fly leaf exert certain clamp force to the material, at this moment, the staff need exert the effort to the material and just can stimulate the material downwardly extending, on the one hand, reduce the overlength that the staff pulled the material, lead to piling up the possibility of material in the choke, on the other hand, fix in advance the material, reduce the possibility that the material took place to rock.

Drawings

Fig. 1 is a schematic view of an overall structure of a printing head for a 3D printer.

Fig. 2 is a schematic view of the structure of the mount and the printing mechanism.

Fig. 3 is a schematic structural view of the fixing mechanism.

Fig. 4 is a schematic structural view of the conveying mechanism.

Fig. 5 is a schematic structural view of the movable sub-mount.

Description of reference numerals: 1. a printing seat; 11. a base; 111. a pulley; 12. mounting a top frame; 121. a feeding guide seat; 13. a mounting seat; 131. installing a main seat; 1311. a feed inlet; 1312. a sliding cavity; 1313. a movable plate; 1314. a second elastic member; 1315. a through hole; 1316. a first cooling fan; 1317. a second cooling fan; 1318. an air guide pipe; 132. a movable auxiliary seat; 1321. a fixing plate; 14. a protective housing; 2. a conveying mechanism; 21. a drive roll; 22. a driven roller; 23. a drive assembly; 231. a drive shaft; 232. a drive motor; 233. a first drive gear; 234. a first driven gear; 235. a second driving gear; 236. a second driven gear; 24. a fluid passage; 25. a limiting groove; 3. a printing mechanism; 31. a throat; 32. a nozzle; 33. a heating block; 34. a heat dissipating block; 4. a fixing mechanism; 41. a limiting rod; 42. mounting a plate; 43. a first elastic member; 44. a slider; 45. an unlocking plate; 46. an ear plate; 5. a fluid delivery assembly; 51. a cooling tank; 52. a first liquid pipe; 53. a second liquid pipe; 54. a rotary joint; 55. and (4) a liquid pump.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

The embodiment of the application discloses 3D printer is with beating printer head, refer to fig. 1, fig. 2, including printing seat 1, set up in printing seat 1 in order to carry out the conveying mechanism 2 that carries the material and set up in printing seat 1 in order to carry out the printing mechanism 3 that melts the printing to the material.

The printing seat 1 comprises a base 11, an installation top frame 12 fixedly connected to one side of the base 11, an installation seat 13 fixedly connected to the lower end face of the installation top frame 12, and a protective cover 14 fixedly connected to the base 11 to cover the installation top frame 12 and the installation seat 13. The side of the base 11 away from the protective housing 14 is rotatably connected with a pulley 111, and the pulley 111 is used for sliding on a sliding rail. The mounting top frame 12 is fixedly connected with a feeding guide seat 121 which is located above the conveying mechanism 2 and is used for materials to pass through, and the protective housing 14 is provided with an avoiding groove for the feeding guide seat 121 to pass through.

Referring to fig. 1 and 3, the mounting seat 13 includes a mounting main seat 131 fixedly connected to a lower end surface of the mounting top frame 12 and a movable auxiliary seat 132, the mounting main seat 131 has a mounting cavity, and a charging hole communicated with the mounting cavity is opened at one side of the mounting main seat 131. The lower part of the movable auxiliary seat 132 is hinged to the inner side wall of the charging opening through a hinge shaft to control the charging opening to be opened and closed, and the protective casing 14 is correspondingly provided with an avoiding notch for the movable auxiliary seat 132 to overturn.

Referring to fig. 4 and 5, the movable sub-base 132 is fixedly protruded with a fixing plate 1321 extending into the mounting cavity, the conveying mechanism 2 includes a driving roller 21 rotatably connected to the mounting base 13, a driven roller 22 rotatably connected to the fixing plate 1321, and a driving assembly 23 for driving the driving roller 21 and the driving roller 21 to rotate so as to convey the material, and the driving roller 21 and the driven roller 22 are arranged in parallel. The circumferential surfaces of the driving roller 21 and the driven roller 22 are provided with limit grooves 25 for the material strips to pass through in a surrounding mode, and the inner walls of the limit grooves 25 are convexly provided with anti-skidding convex edges, so that the possibility of skidding of the materials is reduced.

Referring to fig. 3 and 4, the driving assembly 23 includes a driving shaft 231 rotatably connected to the mounting cavity, a driving motor 232 for driving the driving shaft 231 to rotate, a first driving gear 233 coaxially and fixedly sleeved on the driving shaft 231, a first driven gear 234 coaxially and fixedly sleeved on the driving roller 21 and externally engaged with the first driving gear 233, a second driving gear 235 coaxially and fixedly sleeved on the driving roller 21, and a second driven gear 236 coaxially and fixedly sleeved on the driven roller 22 and externally engaged with the second driving gear 235. Specifically, the driving motor 232 is a servo motor, the driving motor 232 is fixedly connected to the outer wall of the mounting main seat 131, and an output shaft of the driving motor 232 is fixedly connected to the driving shaft 231.

The top wall of the main mounting seat 131 is provided with a feed inlet 1311 communicated with the mounting cavity and the feeding guide seat 121 for materials to pass through, the top wall of the main mounting seat 131 is provided with a sliding cavity 1312 communicated with the feed inlet 1311, and one side of the main mounting seat 131, which is located at the charging hole, is provided with a limiting hole communicated with the sliding cavity 1312. A movable plate 1313 is slidably connected to the sliding cavity 1312, a through hole 1315 for passing materials is formed in the movable plate 1313, a pressure sensor is disposed on the inner peripheral wall of the through hole 1315 of the movable plate 1313, and when the pressure sensor reaches a certain pressure value, the driving motor 232 is in a power-off state. A second elastic member 1314 for forcing the movable plate 1313 to slide toward the position-limiting hole is disposed between the sliding cavity 1312 and the movable plate 1313, and specifically, the second elastic member 1314 is a compression spring, one end of the compression spring is fixedly connected to the inner wall of the sliding cavity 1312, and the other end of the compression spring is fixedly connected to the movable plate 1313.

Referring to fig. 4 and 5, a fixing mechanism 4 is disposed between the auxiliary movable seat 132 and the main mounting seat 131 to detachably connect the free end of the auxiliary movable seat 132 to the main mounting seat 131, and the fixing mechanism 4 includes a limiting rod 41 slidably disposed through the auxiliary movable seat 132, a mounting plate 42 fixedly connected to the limiting rod 41 and located outside the auxiliary movable seat 132, and a first elastic member 43 fixedly connected between the auxiliary movable seat 132 and the mounting plate 42 to force the limiting rod 41 to be inserted into the limiting hole. The first elastic member 43 is an extension spring, one end of the extension spring is fixedly connected to the outer wall of the movable auxiliary seat 132, the other end of the extension spring is fixedly connected to the mounting plate 42, and the elastic force of the compression spring is smaller than the elastic deformation force threshold of the extension spring. The outer side wall fixedly connected with of the vice seat 132 of activity is located the otic placode 46 of gag lever post 41 top, and the vice seat 132 of activity is provided with unlocking plate 45, and unlocking plate 45 hinges in otic placode 46 through the articulated shaft, and mounting panel 42 is connected with slider 44 along vertical sliding, and unlocking plate 45's one end hinges in slider 44, and unlocking plate 45's top is close to the top of the vice seat 132 of activity. After the position-limiting rod 41 is inserted into the position-limiting hole, the position-limiting rod 41 abuts against the sidewall of the movable plate 1313 to force the movable plate 1313 to slide, so that the through hole 1315 of the movable plate 1313 and the feed port 1311 are in a facing state, and at this time, the compression spring is elastically deformed.

Referring to fig. 1 and 5, the driving roller 21 and the driven roller 22 are both provided with a fluid passage 24 through which cooling fluid passes, and the protective cover 14 is provided with a fluid feeding unit 5 for feeding cooling fluid to the fluid passage 24. The infusion set 5 comprises a cooling box 51 fixedly connected to the upper end face of the protective housing 14 and used for storing cooling liquid, a first liquid pipe 52 and a second liquid pipe 53, two ends of the driving roller 21 and two ends of the driven roller 22 are rotatably connected with a rotating joint 54, and the number of the first liquid pipe 52 and the number of the second liquid pipe 53 are two. The drive roller 21 and the driven roller 22 have the same structure, and in this embodiment, taking the driven roller 22 as an example, one end of the first liquid pipe 52 is connected to the cooling tank 51 and the other end is connected to one of the rotary joints 54 of the driven roller 22, and one end of the second liquid pipe 53 is connected to the cooling tank 51 and the other end is connected to the other rotary joint 54 of the driven roller 22. The first liquid pipe 52 is provided with a liquid pump 55 for pumping the inside of the cooling tank 51 to the flow channel 24, the first liquid pipe 52 and the second liquid pipe 53 connected to the drive roller 21 are both hard pipes, and the first liquid pipe 52 and the second liquid pipe 53 connected to the driven roller 22 are both bellows hoses.

Referring to fig. 2 and 3, the printing mechanism 3 includes a throat 31 fixedly connected to the mounting cavity, a nozzle 32 fixedly connected to a lower portion of the throat 31 and exposed to the protective housing 14, and a heating block 33 fixedly mounted on the throat 31 to heat the throat 31. The axis of the throat 31 is vertically arranged, the throat 31 is located under the limiting groove 25, the throat 31 is coaxially and fixedly sleeved with a heat insulation sleeve (not shown in the figure), the middle part of the throat 31 is fixedly sleeved with a heat dissipation block 34 located below the heat insulation sleeve, and the heating block 33 and the heat dissipation block 34 are both located below the mounting main seat 131. The outer wall of the main mounting seat 131 is fixedly connected with a first cooling fan 1316 for blowing and radiating heat to the mounting cavity, the outer side wall of the main mounting seat 131 is fixedly connected with a second cooling fan 1317, an air outlet of the second cooling fan 1317 is connected with an air guide pipe 1318, and an air outlet of the air guide pipe 1318 is aligned with the nozzle 32.

The implementation principle that 3D printer used beats printer head of the embodiment of this application does: a first cooling fan 1316 is additionally arranged to blow heat emitted by the throat 31, so that heat accumulation in the installation cavity is reduced, and the possibility of material blockage caused by melting of materials at the driving roller 21 and the driven roller 22 is reduced; the cooling liquid of the cooling tank 51 enters the flow liquid channel 24 of the driving roller 21 and the driven roller 22 through the first liquid pipe 52, so that the driving roller 21 and the driven roller 22 are cooled, the possibility that the materials are adhered to the outer surfaces of the driving roller 21 and the driven roller 22 due to heat is effectively reduced, the possibility that the materials are blocked due to melting of the materials at the driving roller 21 and the driven roller 22 is effectively reduced, and the cooling liquid after absorbing heat is discharged to the cooling tank 51 through the second liquid pipe 53 for repeated circulation.

When the material needs to be charged, the material sequentially passes through the feeding guide seat 121, the feeding hole 1311 and the through hole 1315 of the movable plate 1313, after the limiting rod 41 slides out of the limiting hole, the second elastic member 1314 elastically resets to force the movable plate 1313 to slide for a short distance, so that the movable plate 1313 applies a certain clamping force to the material, at this time, the pressure sensor arranged in the through hole 1315 senses the acting force, the signal of the pressure sensor is transmitted to the controller in the driving motor, the controller makes the driving motor 232 in a power-off state, the operation safety is improved, the worker can pull the material to extend downwards by applying the acting force to the material, after the lower end of the material passes through the limiting groove 25 and the upper inner hole of the throat 31, the free end of the movable auxiliary seat 132 is turned over, and after the limiting rod 41 is inserted into the limiting hole, the limiting rod 41 abuts against the movable plate 1313 to slide reversely, the through hole 1315 and the feed hole 1311 of the movable plate 1313 are in a facing state, the pressure sensor does not sense the acting force at this time, and the driving motor 232 is in a power-on state, so that the printing head can normally work.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a 3D printer is with beating printer head which characterized in that: comprises a printing seat (1), a conveying mechanism (2) arranged on the printing seat (1) for conveying materials and a printing mechanism (3) arranged on the printing seat (1) for melting and printing the materials; the printing seat (1) comprises a base (11), a mounting top frame (12) arranged on one side of the base (11) and a mounting seat (13) arranged on the mounting top frame (12), the mounting top frame (12) is provided with a feeding guide seat (121) which is positioned above the conveying mechanism (2) and is used for materials to pass through, the mounting seat (13) is provided with a mounting cavity, the conveying mechanism (2) comprises a driving roller (21) rotatably connected to the mounting seat (13), a driven roller (22) rotatably connected to the mounting seat (13) and a driving assembly (23) for driving the driving roller (21) and the driving roller (21) to rotate so as to convey materials, the driving roller (21) and the driven roller (22) are both provided with a fluid channel (24) for cooling fluid to pass through, the printing seat (1) is provided with a liquid conveying assembly (5) for conveying cooling liquid to the liquid passage (24).

2. The print head of claim 1, wherein: print seat (1) still including setting up in base (11) in order to install protecting sheathing (14) that roof-rack (12) and mount pad (13) cover were established, infusion subassembly (5) are including cooling box (51) that the confession coolant liquid stored, first liquid pipe (52) and second liquid pipe (53), cooling box (51) are installed in protecting sheathing (14), the both ends of drive roll (21) and driven voller (22) are all rotated and are connected with rotary joint (54), first liquid pipe (52) and second liquid pipe (53) all are provided with two, the one end of one of them first liquid pipe (52) is connected in cooling box (51) and the other end and is connected in rotary joint (54) of drive roll (21) one end, the one end of one of them second liquid pipe (53) is connected in cooling box (51) and the other end and is connected in rotary joint (54) of driven voller (21) the other end, the one end of another first liquid pipe (52) is connected in cooling box (51) and the other end and is connected in driven voller (22) one end And a rotary joint (54) in which one end of the other second liquid pipe (53) is connected to the cooling tank (51) and the other end is connected to the other end of the driven roller (22).

3. The print head of claim 1, wherein: the driving assembly (23) comprises a driving shaft (231) rotatably connected to the mounting cavity, a driving motor (232) for driving the driving shaft (231) to rotate, a first driving gear (233) coaxially and fixedly sleeved on the driving shaft (231), a first driven gear (234) coaxially and fixedly sleeved on the driving roller (21) and meshed with the first driving gear (233), a second driving gear (235) coaxially and fixedly sleeved on the driving roller (21), and a second driven gear (236) coaxially and fixedly sleeved on the driven roller (22) and meshed with the second driving gear (235).

4. The print head of claim 1, wherein: printing mechanism (3) include throat (31) of fixed connection in mount pad (13), connect in nozzle (32) of throat (31) lower part and to carry out heating piece (33) that heats throat (31), mount pad (13) fixedly connected with heat insulating sleeve, and the heat insulating sleeve is worn to locate by the coaxial fixed cover in throat (31), and the fixed cover in middle part of throat (31) is equipped with radiating block (34).

5. The print head of claim 4, wherein: and the mounting seat (13) is fixedly connected with a first cooling fan (1316) for blowing and radiating the mounting cavity.

6. The print head of claim 4, wherein: the mounting seat (13) is fixedly connected with a second cooling fan (1317), an air outlet of the second cooling fan (1317) is connected with an air guide pipe (1318), and an air outlet of the air guide pipe (1318) is aligned to the nozzle (32).

7. The print head of claim 1, wherein: the mounting seat (13) comprises a mounting main seat (131) and a movable auxiliary seat (132) which are fixedly connected to the mounting top frame (12), a charging hole communicated with the mounting cavity is formed in one side of the mounting main seat (131), the movable auxiliary seat (132) is hinged to the mounting main seat (131) to control the charging hole to be opened and closed, a fixing mechanism (4) is arranged between the movable auxiliary seat (132) and the mounting main seat (131) to detachably connect the free end of the movable auxiliary seat (132) to the mounting main seat (131), the driving roller (21) is rotatably connected to the mounting main seat (131), and the driven roller (22) is rotatably connected to the movable auxiliary seat (132).

8. The print head of claim 7, wherein: spacing hole has been seted up in installation main seat (131), fixed establishment (4) including slide wear to locate gag lever post (41) of activity auxiliary seat (132), fixed connection in gag lever post (41) and be located the outside mounting panel (42) of activity auxiliary seat (132) and fixed connection in order to force gag lever post (41) to insert first elastic component (43) of locating spacing hole between activity auxiliary seat (132) and mounting panel (42).

9. A printhead for a 3D printer according to claim 8, wherein: the outer side wall of the movable auxiliary seat (132) is fixedly connected with an ear plate (46) located above the limiting rod (41), the movable auxiliary seat (132) is provided with an unlocking plate (45), the unlocking plate (45) is hinged to the ear plate (46) through a hinge shaft, the mounting plate (42) is connected with a sliding block (44) in a vertical sliding mode, one end of the unlocking plate (45) is hinged to the sliding block (44), and the top of the unlocking plate (45) is close to the top of the movable auxiliary seat (132).

10. A printhead for a 3D printer according to claim 8, wherein: the top wall of the mounting main seat (131) is provided with a feed inlet (1311) communicated with the mounting cavity for materials to pass through, the top wall of the mounting main seat (131) is provided with a sliding cavity (1312) communicated with the feeding hole (1311), the sliding cavity (1312) is communicated with the limiting hole, the mounting main seat (131) is provided with a movable plate (1313) connected with the sliding cavity (1312) in a sliding manner, the movable plate (1313) is provided with a through hole (1315) for materials to pass through, a second elastic piece (1314) is arranged between the inner wall of the sliding cavity (1312) and the movable plate (1313), the limiting rod (41) is inserted in the limiting hole, the limiting rod (41) is abutted against the side wall of the movable plate (1313) to force the movable plate (1313) to slide, so that the through hole (1315) of the movable plate (1313) and the feed port (1311) are in a facing state, at the moment, the second elastic piece (1314) is elastically deformed, and the elastic force of the second elastic piece (1314) is smaller than the elastic threshold of the first elastic piece (43).