CN209756102U

CN209756102U - Three-dimensional printer

Info

Publication number: CN209756102U
Application number: CN201920477483.2U
Authority: CN
Inventors: 陈德裕; 卢艳
Original assignee: Print Rite Unicorn Image Products Co Ltd
Current assignee: Zhuhai Tianwei Additives Co ltd
Priority date: 2019-04-09
Filing date: 2019-04-09
Publication date: 2019-12-10
Anticipated expiration: 2029-04-09

Abstract

The utility model provides a three-dimensional printer, which comprises a base, a top cover, a sliding table component, a connecting component and a printing head; the sliding table assembly comprises a rail piece and a sliding piece, and the first end of the connecting assembly is hinged to the sliding piece; the printing head comprises a printing nozzle assembly and a nozzle protection shell; the printing nozzle component comprises a throat pipe, a nozzle, a pressing block sleeved outside the throat pipe and a PCB; a plurality of hinged seats are arranged on the periphery of the spray head protective shell; the plurality of connecting assemblies are connected with the spray head protective shell, and the second ends of the connecting assemblies are fixedly hinged to the hinge seats; the printing nozzle assembly is arranged in the accommodating cavity of the nozzle protective shell, and the pressing block is detachably connected with the nozzle protective shell. The spray head protective shell is hinged to the parallel connection arms, the installation difficulty is greatly reduced when the printing spray head assembly serving as an easily-consumed replacement is replaced after being detached and is installed again, the error probability is reduced, and the dismounting mode of the printing spray head assembly is simpler.

Description

Three-dimensional printer

Technical Field

The utility model relates to a print technical field, specifically relate to a three-dimensional inkjet printer.

Background

Three-dimensional printing is one of rapid prototyping manufacturing technologies, is a technology for constructing an object by using a bondable material such as powdered metal or plastic and the like and by using a digital model file as a basis and by using a layer-by-layer printing mode, and is a major breakthrough in the technical field of manufacturing. The device can overcome the special structural obstacle which can not be realized by the traditional mechanical processing, can realize the simplified production of any complex structural component, and can automatically, directly and accurately convert the design idea from a digital model into a model or a device with certain functions.

The existing Delta three-dimensional printer comprises a base body, a top cover and three sliding rail pieces arranged between the base body and the top cover, wherein each sliding rail piece is provided with a sliding piece capable of sliding along the vertical direction, and each sliding piece is hinged with the first end of a corresponding parallel connecting arm; delta three-dimensional inkjet printer still includes beats the printer head, beats printer head and includes shower nozzle protective housing and print the shower nozzle subassembly, prints the tracheal joint, choke and the nozzle that the shower nozzle subassembly connects gradually along first direction, and the outer parcel of nozzle has the heating film, prints the shower nozzle subassembly and still includes briquetting, PCB board and the metal connecting plate of suit on the choke. The locking bolt penetrates through the pressing block, the PCB and the metal connecting plate in sequence and then is locked on the spray head protective shell.

the periphery of metal connecting plate is provided with articulated seat first half, and the periphery of shower nozzle protective housing has articulated seat the latter half, and after printing shower nozzle subassembly and shower nozzle protective housing locking, articulated seat first half and articulated seat the latter half splice into articulated seat, and the pivot of parallel connection arm second end is installed between articulated seat first half and articulated seat the latter half, realizes the articulated of parallel connection arm and articulated seat.

The existing Delta three-dimensional printer has the problem that the printing nozzle assembly is an easily-consumed component and needs to be detached and replaced after being used for a certain time. When dismantling printing nozzle subassembly, components of a whole that can function independently between articulated seat first half and the articulated seat latter half promptly beats printer head and the installation relation between the parallel link arm and relieves simultaneously, after the printing nozzle subassembly of renewal, the installation degree of difficulty of installing printer head again is big, and appears neglected loading easily and spare part installation scheduling problem not in place, leads to appearing printing the trouble.

SUMMERY OF THE UTILITY MODEL

an object of the utility model is to provide a three-dimensional inkjet printer convenient to dismouting.

the utility model provides a three-dimensional printer, which comprises a base, a top cover, a sliding table component, a connecting component and a printing head; the sliding table assembly comprises a rail piece and a sliding piece, the sliding piece is slidably arranged on the rail piece, at least three rail pieces are connected between the base and the top cover, and the first end of the connecting assembly is hinged to the sliding piece; a printing space is formed between the base and the top cover and among the plurality of sliding table assemblies; the printing head comprises a printing nozzle assembly and a nozzle protection shell; the printing spray head assembly comprises a throat pipe and a nozzle which are sequentially connected along a first direction, a heating film is wrapped outside the nozzle, and the printing spray head assembly further comprises a pressing block and a PCB board which are sleeved on the throat pipe and are sequentially arranged along the first direction; the nozzle protection shell is provided with an accommodating cavity, the nozzle protection shell is provided with an installation inlet and a printing opening which are communicated with two ends of the accommodating cavity, and a plurality of hinged seats are arranged on the periphery of the nozzle protection shell; the printing head is positioned in the printing space, and the second end of the connecting component is hinged with the hinge seat; print the shower nozzle subassembly and install and hold the intracavity, the nozzle stretches out from printing the opening, can dismantle between briquetting and the shower nozzle protective housing and be connected.

According to the scheme, the metal connecting plates are reduced in the printing nozzle assembly, the hinge seat is integrally arranged outside the nozzle protective shell, the nozzle protective shell is hinged with the connecting assembly, when the printing nozzle assembly serving as an easily-consumed replacement is disassembled, replaced and reinstalled, the nozzle protective shell and the parallel connecting arms do not need to be connected and installed, and the installation difficulty is greatly reduced; and printing shower nozzle subassembly part reduces, and the probability of making mistakes reduces, and the dismouting mode of printing the shower nozzle subassembly is simpler, and is more humanized.

The further proposal is that the pressing block comprises a pressing block body and an elastic arm, and the pressing block body is sleeved outside the larynx pipe; the at least two elastic arms extend out of the pressing block body, in a first direction, the elastic swinging ends of the elastic arms are close to the nozzle relative to the pressing block body, and a first buckling part is arranged in an elastic swinging mode; the nozzle protection shell is provided with a second buckling part, and the first buckling part is buckled with the second buckling part.

It is from top to bottom seen, as the printing shower nozzle subassembly of the easy-to-wear replacement, the elastic arm that has first buckle portion is add to the briquetting on it, can realize printing the swift dismouting of shower nozzle subassembly and shower nozzle protective housing through the cooperation of first buckle portion and second buckle portion.

The further proposal is that the elastic arm is provided with a guide bulge; the spray head protective shell is provided with a guide sliding groove, and the guide protrusion is in sliding fit with the guide sliding groove in the first direction.

From top to bottom, the cooperation of direction arch and direction spout plays when the shower nozzle subassembly is printed in the dismouting and prevents slow-witted effect, and the dismouting is easier.

the further proposal is that the periphery of the pressing block body is provided with a peripheral pressing part which is far away from the axis of the pressing block relative to the elastic arm; the shower nozzle protective housing has the butt face that is located the installation entry periphery, and the PCB board butt is in between periphery pressdown portion and butt face.

It is from top to bottom visible, periphery splenium and the up end of shower nozzle protective housing are pressed from both sides the PCB board jointly, improve installation stability.

The further scheme is that the locking bolt penetrates through the pressing block and the PCB and then is locked on the spray head protective shell.

therefore, the bolt locking mode has the characteristics of stable assembly and convenient disassembly.

The further scheme is that a screw hole seat is arranged on the spray head protective shell, a positioning through hole is formed in the PCB, the screw hole seat penetrates through the positioning through hole, and the locking bolt is locked in a screw hole of the screw hole seat.

therefore, the screw hole seat is matched with the locking bolt and used for positioning the PCB.

The pressing block is provided with a stepped hole, the stepped hole comprises a first hole section and a second hole section which are sequentially connected along the axial direction of the stepped hole, and the first aperture of the first hole section is smaller than the second aperture of the second hole section; the screw hole seat penetrates through the positioning through hole and then extends into the second hole section, and the locking bolt penetrates through the first hole section and then is matched with the screw hole seat.

It can be seen from above that, the cooperation of second hole section and screw hole seat in the shoulder hole realizes the prepositioning between briquetting and the shower nozzle protective housing, reduces the installation degree of difficulty, and improves the installation steadiness.

Further, at least three screw hole seats are arranged on the periphery of the mounting inlet.

according to a further scheme, the printing head further comprises a fan assembly, the fan assembly is installed on the periphery of the spray head protection shell, and an air outlet of the fan assembly faces the nozzle.

from top to bottom, the setting of fan unit spare enables the hot melt consumptive material rapid condensation who extrudes in the nozzle.

the fan component comprises a fan and an air duct piece, a fan outlet of the fan is communicated with an air duct inlet of the air duct piece, and an air duct outlet of the air duct piece is an air outlet.

From top to bottom, add wind channel spare, the fan then can adopt standard product, reduction in production cost, and add wind channel spare and can better control the air-out angle and the air-out scope of air outlet.

Drawings

Fig. 1 is a structural diagram of an embodiment of the three-dimensional printer of the present invention.

Fig. 2 is a structural diagram of a first viewing angle according to a first embodiment of the printhead of the present invention.

Fig. 3 is a structural diagram of a second viewing angle of the first embodiment of the printing head according to the present invention.

Fig. 4 is an exploded view of a first embodiment of the printhead of the present invention.

fig. 5 is an exploded view of a print head assembly according to a first embodiment of the printhead of the present invention.

Fig. 6 is a cross-sectional view of a first embodiment of a printhead according to the present invention.

Fig. 7 is a partial cutaway view of a second embodiment of a printhead according to the present invention.

Fig. 8 is an exploded view of a second embodiment of a printhead according to the present invention.

Detailed Description

First embodiment of printhead

Referring to fig. 1, fig. 1 is a structural diagram of an embodiment of the three-dimensional printer of the present invention. The utility model discloses a three-dimensional inkjet printer is a delta three-dimensional inkjet printer, and three-dimensional inkjet printer includes base 91, top cap 92, three sets of slip table subassembly 93, three sets of coupling assembling 94 and one and beats printer head 1000, and slip table subassembly 93 includes track spare 931 and slider 932, and track spare 931 is for extending the slide bar group of arranging along the z axle direction, and three track spare 931 is connected between base 91 and top cap 92, and three track spare 931 arranges evenly on the circumference position of base 91. The slide 932 is slidably mounted on the rail member 931 along the illustrated z-axis, the connecting member 94 is a parallel connecting arm, and the extending first end of the connecting member 94 is fixedly hinged to the slide 932. Between the base 91 and the top cover 92, and between the plurality of slide assemblies 93, a printing space 900 is formed, and the print head 1000 is hinged with the extended second ends of the three connecting assemblies 94. In a normal use state of the printer, the extension direction of the slide bar group on the rail member 931 is vertical, that is, the z-axis direction is vertical.

With reference to fig. 2 to 4, fig. 2 is a structural diagram of the first visual angle of the first embodiment of the printing head of the present invention, fig. 3 is a structural diagram of the second visual angle of the first embodiment of the printing head of the present invention, and fig. 4 is an exploded structural diagram of the first embodiment of the printing head of the present invention. Print head 1000 includes shower nozzle protective housing 1, prints shower nozzle subassembly 2 and fan assembly 3, prints shower nozzle subassembly 2 and installs to shower nozzle protective housing 1 in, and fan assembly 3 installs outside shower nozzle protective housing 1.

The middle part of the spray head protective shell 1 is provided with an accommodating cavity 100, the spray head protective shell 1 is provided with an installation inlet 101 and a printing opening 102 which are communicated with the accommodating cavity 100 and are positioned at two ends in the z-axis direction, and the upper end of the spray head protective shell 1 is provided with an abutting surface 103 surrounding the periphery of the installation inlet 101; the periphery of shower nozzle protective housing 1 is equipped with three articulated seat 11 along shower nozzle protective housing 1 circumference evenly arranged, and articulated seat 11 has the pivot hole 110 that the perpendicular to z axle direction runs through, and is provided with in the both sides of articulated seat 11 and dodges position 111 (shown in fig. 4), and the setting of dodging position 111 prevents that coupling assembling 94 (shown in fig. 1) from taking place to interfere and unable normal work when rotating for articulated seat 11.

The shower nozzle protection shell comprises a wall body 10 of the shower nozzle protection shell 1, wherein three guide chutes 13 are formed in the wall body 10 of the shower nozzle protection shell 1, the three guide chutes 13 are a fracture which extends downwards from the upper end of the wall body 10 of the shower nozzle protection shell 1 to the middle of the wall body 10 along the negative direction of a z axis, the guide chutes 13 separate the wall body 10 into two wall body parts located on two sides of the guide chutes 13, the guide chutes 13 are communicated between a containing cavity 100 and the outside of the shower nozzle protection shell 1, a hinge seat 11 located on the outside of the wall body 10 is connected between the two wall body parts located on two sides of the guide chutes 13, and a part of the guide chutes 13 is shielded.

on the wall 10, at the end of the guide chute 13 extending along the negative direction of the z-axis, the width of the guide chute 13 in the width direction perpendicular to the direction of the z-axis increases stepwise to form a T-shaped snap-fit position 12 penetrating through the wall 10, the snap-fit position 12 is a second snap-fit portion for snap-fit engagement with the print head assembly 2, and the wall 10 forms a second snap-fit engagement surface 121 facing downward (negative direction of the z-axis) and facing the T-shaped opening between the guide chute 13 and the snap-fit position 12.

With reference to fig. 4 and 5, fig. 5 is an exploded view of a print head assembly according to a first embodiment of the print head of the present invention. The printing nozzle assembly 2 comprises a nozzle body group 21, the nozzle body group 21 comprises a gas pipe joint 213, a throat pipe 212 and a nozzle 211 which are sequentially connected along a first direction (namely, the negative direction of a z axis), the gas pipe joint 213 is a joint used for being connected with a feeding gas pipe, the throat pipe 212 is made of PEEK materials, and the nozzle 211 is a copper nozzle.

The nozzle 211 is wrapped by a heating film (not shown in the figure), the heating film is sleeved by a silica gel sleeve (not shown in the figure), the silica gel sleeve enables the heating film to be tightly attached to the nozzle 211, the heating film is connected to the PCB 23 through a lead 215, a fuse 214 is arranged on the lead 215, and when the temperature of the nozzle 211 exceeds a set value, the fuse 214 is disconnected due to overhigh temperature, and the heating film stops heating. The middle part of the throat 212 is provided with a shaft shoulder 216 which protrudes along the radial direction, and a clamping position 217 is formed between the shaft shoulder 217 and the tracheal joint 213.

Print head assembly 2 also includes a press block 22 and a PCB board 23. The PCB 23 includes a PCB 231, and an electrical component 238 and an electrical component 239 disposed on the PCB 231, wherein the PCB 231 is in a pie shape, a first insertion through hole 230 is disposed in the middle of the PCB 231, and three first avoidance notches 232 are uniformly disposed in the circumferential direction of the PCB 231.

the pressing block 22 comprises a pressing block body 221 and an elastic arm 222, wherein a second insertion through hole 220 is formed in the middle of the pressing block body 221, and three second avoidance notches 226 are formed in the periphery of the pressing block body 221; the three elastic arms 222 are distributed on the outer periphery of the pressing block body 221 along the circumferential direction of the pressing block body 221, and the elastic arms 222 extend toward the first direction (z-axis negative direction), in which the extending ends of the elastic arms 222 are close to the nozzle 211 relative to the extending start ends of the elastic arms 222; the outer circumference of the pressing block body 221 is further provided with an outer circumference pressing portion 225, and the outer circumference pressing portion 225 is away from the axis of the pressing block body 221 with respect to the elastic arm 222.

the extending lower portion of the elastic arm 222 becomes an elastic swing end as the elastic arm 222 extends downward, and a snap projection 223 is provided at the extending end of the elastic arm 222, the snap projection 223 is a projection extending from the extending end of the elastic arm 222 along the radial direction of the pressing piece 22 and facing away from the axial center of the pressing piece 22, and the snap projection 223 is a first engaging portion. The catch projection 223 has a first catch mating surface 223a facing the positive z-axis direction, and the catch projection 223 has a guide slope 223b facing the negative z-axis direction and facing away from the axial center of the pressing piece 22.

in this embodiment, the section of the elastic arm 222 is rectangular, the elastic swing direction of the elastic arm 222 depends on the thickness direction of the elastic arm 222, the protruding direction of the snap projection 223 is consistent with the thickness direction of the elastic arm 222, and the snap projection 223 can displace to enter the snap position and leave the snap position after the elastic arm 222 swings.

The elastic arm 222 is provided with a square block-shaped guide projection 224 directly above the first catch mating face 223a of the catch projection 223. The guide projection 224 projects away from the axial center of the press piece 22 in the radial direction of the press piece 22, and the width of the guide projection 224 is smaller than the width of the catch projection 223 in the width direction perpendicular to the z-axis direction and perpendicular to the projection direction of the guide projection 224, so that the first catch fitting surface 223a is exposed.

The pressing block 22 and the PCB 23 are sleeved on the throat 212, and the pressing block 22 and the PCB 23 are sequentially arranged along a first direction (negative direction of the z axis). The three elastic arms 222 pass through a first avoiding notch 232 at the periphery of the PCB 231, the throat pipe 212 passes through a first insertion through hole 230 at the middle part of the PCB 231 and a second insertion through hole 22 at the middle part of the pressing block body 221 and then is locked with the air pipe joint 213 in a threaded manner, and the pressing block PCB 231 and the pressing block body 221 are limited in the clamping position 217.

With reference to fig. 3 to 6, fig. 6 is a cross-sectional view of a first embodiment of the printhead according to the present invention. The print head assembly 2 is mounted into the accommodating chamber 100 from the mounting inlet 101, and the nozzles 211 protrude from the print opening 102 in the bottom of the head protective case 1. During the process that the three elastic arms 222 reach the engaging position from the position where the three elastic arms 222 extend into the accommodating cavity 100, firstly, the guide slope 223b abuts against the wall 10 to make the elastic arms 222 contract and deform, then the guide protrusion 224 is in sliding fit with the guide chute 13 along the z-axis direction, finally, the elastic arms 222 reach the engaging position, the engaging protrusion 223 enters the T-shaped engaging position 12, the first engaging mating surface 223a of the engaging protrusion 223 abuts against the second engaging mating surface 121 of the wall 10 in the z-axis direction, and the elastic arms 222 are in limited clamping with the wall 10. At this time, the PCB plate 231 is clamped between the abutting surface 103 and the outer peripheral pressing portion 225, thereby achieving detachable mounting between the head protective case 1 and the print head unit 2.

With reference to fig. 3, 4 and 6, the fan assembly 3 includes a fan 32 and an air duct 31, the air duct 31 includes a mounting substrate 311 and an air duct portion 312 disposed on one side of the mounting substrate 311, an air duct 310 is disposed in the middle of the air duct portion 312, the air duct portion 312 has an air duct inlet 313 and an air duct outlet 314 respectively disposed at two extending ends of the air duct 310, and the air duct outlet 314 is an air outlet of the fan assembly 3. The fan 32 is mounted on the mounting substrate 311, and a fan outlet of the fan 32 faces the air duct inlet 313. The fan assembly 3 is mounted outside the wall 10, and the duct outlet 314 is directed from the printing opening 102 at the bottom of the head protective case 1 toward the nozzle 211. Preferably, air guiding notch 104 is provided on wall 10 on the side of printing opening 102, and air guiding notch 104 communicates between printing opening 102 and duct outlet 314, thereby increasing the amount of air supplied.

Referring to fig. 1, 2 and 4, the print head 1000 is located in the printing space 900, the extended second end of each connecting assembly 94 is hinged to a hinge base 11 at a position corresponding to the outer periphery of the head protecting case 1, and a rotating shaft 941 located at the axial second end of the connecting assembly 94 is inserted into the rotating shaft hole 110.

The printing nozzle assembly 2 is provided with less metal connecting plates, the hinge seat 11 is integrally arranged outside the nozzle protective shell 1, the nozzle protective shell 1 is hinged with the connecting assembly 94, and when the printing nozzle assembly 2 serving as an easily-consumed replacement is disassembled, replaced and reinstalled, the connection and installation between the nozzle protective shell 1 and the connecting assembly 94 are not needed, so that the installation difficulty is greatly reduced; and print 2 parts of shower nozzle subassembly and reduce, the installation probability of making mistakes reduces, and the dismouting mode of printing shower nozzle subassembly 2 is simpler, and is more humanized.

In addition, in other embodiments, the snap protrusion may be disposed at other positions of the elastic arm, such as at the middle extending portion of the elastic arm, and since the elastic arm extends downward from the pressing block body, the middle extending portion of the elastic arm also has a certain elastic deformation swing amount, and therefore the middle extending portion of the elastic arm should belong to the above-explained "elastic swing end". In addition, in other embodiments, the extending direction of the elastic arm and the inserting direction (i.e. the negative direction of the z axis in fig. 4 in the first embodiment) of the print head assembly mounted on the head protection casing have a certain inclination angle, that is, the extending ends of the plurality of elastic arms located in the circumferential direction of the pressing block are in a gathering or expanding shape, and this arrangement can also achieve the detachable fastening between the elastic arm and the head protection casing, which should fall into the protection scope claimed in the present invention.

In addition, in other embodiments, the elastic arm may have other shapes, such as a circular cross section and a cylindrical or elongated circular truncated cone shape. Taking a circular truncated cone-shaped elastic arm as an example, the sectional area of the elastic arm is gradually reduced from the extending head end to the extending tail end, the elastic deformation capacity of the elastic arm is gradually increased from the extending head end to the extending tail end, and the elastic arm with the circular cross section has elastic deformation capacity in all directions, at the moment, the direction of the elastic deformation generated by the elastic arm mainly depends on the direction of the acting force applied to the elastic arm, after the elastic arm is inserted into the spray head protective shell, the guide inclined plane positioned at the extending tail end of the elastic arm is firstly contacted with the spray head protective shell, namely, the direction of the elastic deformation generated by the elastic arm is related to the setting direction of the guide.

Second embodiment of printhead

Referring to fig. 7 and 8, fig. 7 is a partial cutaway view of a second embodiment of the printhead according to the present invention, and fig. 8 is an exploded view of the second embodiment of the printhead according to the present invention. In the print head 2000 provided in this embodiment, the head protection case 4 and the print head assembly 5 are detachably connected by screw-fitting. The outer circumference of the head protecting case 4 is also provided with a complete hinge base 41, and the hinge base 41 is arranged in the same manner as in the previous embodiment.

the difference from the previous embodiment is that three stepped holes 520 arranged along the circumferential direction are provided on the pressing block 52, the stepped holes 520 penetrate through the pressing block 52 along the z-axis direction, and in the negative direction of the z-axis, the stepped holes 520 include a first hole section 521 and a second hole section 522 which are sequentially communicated, and the first hole diameter of the first hole section 521 is smaller than the second hole diameter of the second hole section 522. The PCB 53 is provided with three positioning through holes 531, the accommodating cavity 400 of the head protection case 4 is provided with three screw hole seats 42 arranged along the z-axis forward direction, the three screw hole seats 42 protrude out of the abutting surface 402 along the z-axis forward direction, and the top of the screw hole seat 42 is provided with a screw hole 421.

After the print head assembly 5 is installed in the accommodating cavity 400, the screw seat 42 passes through the positioning through hole 531 and then enters the second hole section 522, finally, the locking bolt 6 extends into the stepped hole 520 from the opening on the upper surface of the pressing block 52, passes through the first hole section 521 and then extends into the screw hole 421 of the screw seat 42, and is locked in threaded fit with the screw hole, the nut of the locking bolt 6 abuts against the upper surface of the pressing block 52, so that downward pressure is applied to the pressing block 52, and the PCB 53 is clamped.

because articulated seat 41 wholly sets up outside shower nozzle protective housing 4, so this embodiment possesses the dismouting degree of difficulty and reduces equally, and the installation probability of making mistakes reduces, advantages such as the dismouting mode is simpler, more humanized.

Finally, it should be emphasized that the above-described embodiments are merely preferred examples of the present invention, and are not intended to limit the invention, as those skilled in the art will appreciate that various changes and modifications may be made, and any and all modifications, equivalents, and improvements made, while remaining within the spirit and principles of the present invention, are intended to be included within the scope of the present invention.

Claims

1. The three-dimensional printer comprises a base, a top cover, a sliding table assembly, a connecting assembly and a printing head;

The sliding table assembly comprises a rail piece and a sliding piece, the sliding piece is slidably mounted on the rail piece, at least three rail pieces are connected between the base and the top cover, and the first end of the connecting assembly is hinged to the sliding piece;

A printing space is formed between the base and the top cover and among the plurality of sliding table assemblies;

the method is characterized in that:

The printing head comprises a printing nozzle assembly and a nozzle protection shell;

The printing spray head assembly comprises a throat pipe and a nozzle which are sequentially connected along a first direction, a heating film is wrapped outside the nozzle, and the printing spray head assembly further comprises a pressing block and a PCB board which are sleeved on the throat pipe, wherein the pressing block and the PCB board are sequentially arranged along the first direction;

The sprayer protection shell is provided with an accommodating cavity, the sprayer protection shell is provided with an installation inlet and a printing opening which are respectively communicated with two ends of the accommodating cavity, and a plurality of hinged seats are arranged on the periphery of the sprayer protection shell;

The printing head is positioned in the printing space, and the second end of the connecting assembly is hinged with the hinge seat;

The printing spray head assembly is installed in the containing cavity, the nozzle extends out of the printing opening, and the pressing block is detachably connected with the spray head protective shell.

2. The three-dimensional printer according to claim 1, characterized in that:

The pressing block comprises a pressing block body and an elastic arm, and the pressing block body is sleeved outside the throat pipe;

The at least two elastic arms extend out of the pressing block body, in the first direction, the elastic swinging ends of the elastic arms are close to the nozzle relative to the pressing block body, and the elastic swinging ends are provided with first buckling parts;

The nozzle protection shell is provided with a second buckling part, and the first buckling part is buckled with the second buckling part.

3. The three-dimensional printer according to claim 2, characterized in that:

the elastic arm is provided with a guide bulge;

The sprayer protective shell is provided with a guide sliding groove, and the guide protrusion is in sliding fit with the guide sliding groove along the first direction.

4. The three-dimensional printer according to claim 2, characterized in that:

The periphery of the pressing block body is provided with a peripheral pressing part, and the peripheral pressing part is far away from the axis of the pressing block relative to the elastic arm;

The sprayer protective shell is provided with an abutting surface located on the periphery of the installation inlet, and the PCB abuts between the periphery pressing portion and the abutting surface.

5. The three-dimensional printer according to claim 1, characterized in that:

And the locking bolt penetrates through the pressing block and the PCB and then is locked on the sprayer protective shell.

6. The three-dimensional printer according to claim 5, characterized in that:

The shower nozzle protective housing is provided with a screw hole seat, the PCB is provided with a positioning through hole, the screw hole seat penetrates through the positioning through hole, and the locking bolt is locked in a screw hole of the screw hole seat.

7. The three-dimensional printer according to claim 6, characterized in that:

The pressure block is provided with a stepped hole, the stepped hole comprises a first hole section and a second hole section which are sequentially connected along the axial direction of the stepped hole, and the first aperture of the first hole section is smaller than the second aperture of the second hole section;

the screw hole seat penetrates through the positioning through hole and then extends into the second hole section, and the locking bolt penetrates through the first hole section and then is matched with the screw hole seat.

8. the three-dimensional printer according to claim 6, characterized in that:

At least three of the screw hole seats are arranged on the periphery of the mounting inlet.

9. The three-dimensional printer according to any one of claims 1 to 8, characterized in that:

The printing head further comprises a fan assembly, the fan assembly is installed on the periphery of the spray head protective shell, and an air outlet of the fan assembly faces the nozzle.

10. the three-dimensional printer according to claim 9, characterized in that:

The fan assembly comprises a fan and an air duct piece, a fan outlet of the fan is communicated with an air duct inlet of the air duct piece, and an air duct outlet of the air duct piece is the air outlet.