CN117584444A - 3D printer adopting multi-nozzle type melting technology and printing method of 3D printer - Google Patents

Abstract

The invention relates to the technical field of 3D printing equipment, in particular to a 3D printer of a multi-nozzle type melting technology and a printing method thereof. The invention provides a 3D printer and a printing method of a multi-nozzle fusion technology, comprising the following steps: the middle position of the top of the base is provided with a hot bed for placing the hot bed and driving the hot bed to move; printing mechanism, base top both sides position symmetry are equipped with the support column, and the support column upper portion of base is equipped with the printing mechanism that drives a plurality of shower nozzles and remove the printing: the pushing mechanism is arranged on the printing mechanism, and the pushing mechanism is convenient to switch the printing spray head. According to the invention, the computer is used for controlling the extrusion wheel to rotate and downwards extrude the printing spray head to be used to downwards move, so that the purpose of switching the used spray head can be achieved without disassembling and replacing the spray head by the device, the problem that the spray head is used with normal installation due to continuous abrasion caused by disassembling the spray head is avoided, and the switching of the printing spray head is simpler and easier to control intelligently.

Description

3D printer adopting multi-nozzle type melting technology and printing method of 3D printer

Technical Field

The invention relates to the technical field of 3D printing equipment, in particular to a 3D printer of a multi-nozzle type melting technology and a printing method thereof.

Background

A 3D printer is a manufacturing machine that uses rapid prototyping techniques, which uses digital model files as a basis to build up objects by sintering or melt-depositing layers of material, extruding molten plastic or resin through a nozzle, in successive deposited layers that combine with one another upon cooling to build up a three-dimensional object.

In order to overcome the defect that only a single material or color can be printed, a 3D printer with multiple nozzles is gradually developed.

The existing multi-nozzle 3D printer mainly adopts the mode that a moving assembly of the 3D printer and a printing spray head are detachably arranged, one printer is matched with a plurality of nozzles, and the purpose that each nozzle prints one color or material for use can be achieved through the arrangement.

Therefore, there is a need to design a 3D printer that facilitates multi-nozzle fusion techniques for switching spray heads.

Disclosure of Invention

In order to overcome the defect that the replacement of the spray heads in the prior art needs to spend redundant steps to easily cause the problem of the installation of the spray heads, the technical problem to be solved is that: A3D printer is provided that facilitates a multi-nozzle fusion technique that switches spray heads.

The technical proposal is as follows: a multi-nozzle fusion technique 3D printer comprising: the device comprises a base, a base and a hot bed assembly, wherein the hot bed assembly is arranged in the middle of the top of the base and used for placing the hot bed and driving the hot bed to move; printing mechanism, base top both sides position symmetry are equipped with the support column, and the support column upper portion of base is equipped with the printing mechanism that drives a plurality of shower nozzles and remove the printing: the pushing mechanism is arranged on the printing mechanism, and the pushing mechanism for conveniently switching the printing spray head is arranged on the printing mechanism: wire coil mechanism, support column top of base both sides is equipped with the wire coil mechanism that receives the bundle to the raw materials line.

Further, the printing mechanism further includes: the movable assembly is arranged between the upper parts of the support columns at two sides of the base and comprises a fixed part fixed with the support columns of the base and a movable part freely moving on the fixed part; the square seat is arranged on the moving part of the moving assembly, and a plurality of mounting holes for placing the spray heads are formed in the square seat; the mounting sleeves are arranged in the mounting holes of the square seats in a sliding manner; the sliding block is arranged on each side wall of the outer side of the mounting sleeve, each side wall of the mounting hole of the square seat is provided with a square groove, and the sliding block slides in the square groove; the shower nozzle, the shower nozzle sets up in the inboard of installation cover, through installation cover and square seat installation cooperation.

Further, the pushing mechanism further includes: the spray heads are circumferentially arranged around the horizontal center of the square seat, a sliding groove is formed in the middle of the top of the square seat, the horizontal shape of the sliding groove changes along with the number of the spray heads, meanwhile, the square grooves are communicated with the sliding groove and the mounting holes of the square seat, and one side, close to the center of the square seat, of the mounting sleeve is provided with the convex blocks through sliding blocks which slide in the sliding groove; the first elastic piece is arranged between the lug and the bottom of the chute; the top of the square seat is provided with a supporting frame; the middle position of the bottom of the support frame is rotationally provided with the extrusion wheel, and a wheel shaft of the extrusion wheel penetrates through the support frame; the upper part of the wheel shaft of the extrusion wheel is provided with a first full gear; the bottom of the support frame is provided with the first servo motor; the top of the support frame is rotatably provided with a gear lack, the gear lack is meshed with a first all gear, the gear ratio of the gear lack and the first all gear changes along with the number of the spray heads, and the gear lack is connected with an output shaft of a first servo motor through a coupler.

Further, the wire coil mechanism further includes: the upper part of the supporting column of the base is provided with the mounting seat; the wire tray is rotationally arranged on the mounting seat; the upper part of one side of the mounting seat, which is close to the wire tray, is provided with a fixing plate; the protective shell is detachably arranged on the fixed disc and shields and protects the upper half part of the wire tray; the bottom of one side of each mounting seat, which is close to the wire tray, is provided with a fixing seat; the top of the support frame is provided with a plurality of second fixing seats; the protection pipes are connected between the bottom of the first fixing seat and the top of the second fixing seat; the material line is coiled in the material tray, and the output end of the material line sequentially passes through the first fixing seat, the protection tube and the second fixing seat to enter the spray head for hot melting processing.

Further, the device also comprises a triggering mechanism, specifically comprising: a fixed frame is arranged at the bottom of the square seat; the induction contacts are arranged at the top of the inner side of the fixed frame and at the positions right below the spray heads; the data connecting wire is arranged between the fixed frame and the square seat, so that the data connecting wire is electrically connected with the device controller.

Further, still include feeding mechanism, specifically include: the top of the first fixing seat is provided with two supporting seats; the friction wheels are arranged on the supporting seat, the friction wheels on the same first fixing seat are close to each other, and the raw material wire passes through between the two friction wheels and is in friction fit with the two friction wheels; the first fixing seats are respectively provided with a first servo motor, and the first servo motors are respectively connected with one friction wheel through a coupling; and the wheel shafts of the friction wheels are respectively provided with a second full gear, and the two friction wheels of the same first fixing seat are matched through the second full gears in a transmission way.

Further, the device also comprises a limiting mechanism, specifically comprising: the middle position of the top of the support frame is provided with a fixing frame which is positioned right above the first all gear; the clamping blocks are symmetrically and slidably arranged on two sides of the inside of the fixing frame and are matched with the first all-gear in a clamping way; and a second elastic piece is arranged between one side of the clamping block, which is far away from the first full gear, and the fixing frame.

Further, the protection tube is a metal braided tube.

On the other hand, the invention also provides a printing method of the 3D printer adopting the multi-nozzle fusion technology, which adopts the 3D printer to print, and comprises the following printing steps:

s1, importing 3D data into a computer, and establishing data connection with a 3D printer;

s2, selecting a square seat, a proper number of printing spray heads, a printing platform carrier, a spray head temperature and a platform temperature according to model requirements;

s3, properly loading printing materials to each nozzle, and setting an initial printing position;

s4, performing printing work;

s5, taking out the printing finished product from the printer for subsequent steps, and cleaning and maintaining the printing nozzle.

The invention has the advantages that: 1. according to the invention, the plurality of printing spray heads are arranged on the square seat, the computer is used for controlling the extrusion wheel to rotate and downwards extrude the printing spray heads needed to be used to downwards move, so that the purpose of switching the used spray heads can be achieved without disassembling and replacing the spray heads by a device, the use precision and normal installation of the spray heads caused by continuous abrasion generated by disassembling the spray heads are avoided, and the switching of the printing spray heads is simpler and easier to intelligently control.

2. When the shower nozzle is pressed the lug by the extrusion wheel and is down to running position, the lower part of shower nozzle can be with the contact of the response contact on the fixed frame, and the computer is through pressing contact signal control shower nozzle operation, and what shower nozzle of the more accurate control of messenger's device begins to print, avoids the control of shower nozzle to appear the error.

Drawings

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a schematic perspective view of a printing mechanism according to the present invention.

Fig. 3 is an exploded view of the three-dimensional structure of the printing mechanism and pushing mechanism of the present invention.

Fig. 4 is a schematic perspective view of the wire coil mechanism of the present invention.

Fig. 5 is an enlarged view of the perspective structure at a of the present invention.

Fig. 6 is a schematic view of a part of a three-dimensional structure of a wire coil mechanism of the present invention.

Fig. 7 is a schematic perspective view of a first embodiment of the trigger mechanism of the present invention.

Fig. 8 is a schematic view of a second perspective of the trigger mechanism of the present invention.

Fig. 9 is a schematic diagram of a first perspective structure of the feeding mechanism according to the present invention.

Fig. 10 is a schematic view of a second perspective structure of the feeding mechanism according to the present invention.

Fig. 11 is a schematic perspective view of the limiting mechanism of the present invention.

Fig. 12 is a schematic cross-sectional view of a three-dimensional structure of the limiting mechanism of the present invention.

Fig. 13 is an exploded view of a three-dimensional structure of the confinement mechanism of the present invention.

FIG. 14 is a flow chart of a 3D printing method according to the present invention

Reference numerals: 1_base, 2_hot bed assembly, 3_print mechanism, 301_move assembly, 302_square seat, 303_square slot, 304_mount, 305_slider, 306_shower, 4_push mechanism, 401_slide, 402_bump, 4021_first elastic member, 403_support frame, 404_pinch roller, 405_first full gear, 406_first servomotor, 407_short gear, 5_wire coil mechanism, 501_mount, 502_wire tray, 503_fixed disk, 504_protective case, 505_first fixed seat, 506_second fixed seat, 507_protective tube, 508_raw wire, 6_trigger mechanism, 601_fixed frame, 602_sense contact, 603_data connection wire, 7_feed mechanism, 701_support seat, 702_pinch roller, 703_second servomotor, 704_second full gear, 8_limit mechanism, 801_fixed frame, 802_clamp block, 803_second elastic member.

Detailed Description

The invention is further described below with reference to the drawings and examples.

Example 1

As shown in fig. 1 to 6, the invention provides a 3D printer of a multi-nozzle type melting technology, which specifically comprises a base 1, a hot bed assembly 2, a printing mechanism 3, a pushing mechanism 4 and a wire coil mechanism 5, wherein the hot bed assembly 2 used for placing the hot bed and driving the hot bed to move is arranged in the middle position of the top of the base 1, support columns capable of moving and fixing are symmetrically arranged at two sides of the top of the base 1, the printing mechanism 3 driving a plurality of spray heads 306 to perform moving printing is arranged at the upper part of the support column of the base 1, the pushing mechanism 4 convenient for switching the spray heads 306 is arranged on the printing mechanism 3, and the wire coil mechanism 5 for drawing a raw material wire 508 is arranged at the tops of the support columns at two sides of the base 1.

The printing mechanism 3 further comprises a moving assembly 301, a square seat 302, a mounting sleeve 304, a sliding block 305 and a spray head 306, wherein the moving assembly 301 is arranged on the upper portions of support columns on two sides of the base 1 in a bolt connection mode, a fixing portion of the moving assembly 301 is fixed with the support columns of the base 1, a moving portion of the moving assembly 301 moves freely on the fixing portion, the moving portion of the moving assembly 301 is provided with the square seat 302 in a bolt connection mode, a plurality of mounting holes for placing the spray head 306 are formed in the square seat 302, the spray head 306 is slidably arranged in the mounting holes of the square seat 302 through the mounting sleeve 304, the sliding block 305 is arranged on each side wall on the outer side of the mounting sleeve 304, square grooves 303 are formed in each side wall of the mounting holes of the square seat 302, and the sliding block 305 slides in the square grooves 303 to be in mounting fit with the square seat 302.

The pushing mechanism 4 further comprises a protruding block 402, a first elastic component 4021, a supporting frame 403, a squeezing wheel 404, a first full gear 405, a first servo motor 406 and a gear-lack 407, wherein the spray head 306 is circumferentially arranged on the square seat 302 around the horizontal center of the square seat 302, a sliding groove 401 is formed in the middle position of the top of the square seat 302, the horizontal shape of the sliding groove 401 changes along with the number of the spray heads 306, meanwhile, the square groove 303 is communicated with the sliding groove 401 and the mounting hole of the square seat 302, one side of the mounting sleeve 304, which is close to the center of the square seat 302, is provided with the protruding block 402 through the sliding block 305, the protruding block 402 slides in the sliding groove 401, the first elastic component 4021 is arranged between the protruding block 402 and the bottom of the sliding groove 401, the supporting frame 403 is rotatably provided with the squeezing wheel 404 at the middle position of the bottom of the supporting frame 403, a wheel shaft of the squeezing wheel 404 penetrates through the supporting frame 403, the first full gear 405 is arranged on the upper part of the wheel shaft of the squeezing wheel 404, the supporting frame 403 is provided with the first servo motor 406, the top of the supporting frame 403 is rotatably provided with the gear-lack 407, the gear-lack 407 is meshed with the first full gear 405, the gear-lack 407 is correspondingly provided with the gear number of the gear 306, the gear-lack 407 is rotatably matched with the first full gear, the gear ratio of the first full gear 405, the gear is arranged along with the number of the gear 306, and the output shaft of the gear 407 is rotatably connected with the first servo motor through a coupler.

The wire coil mechanism 5 is further characterized by comprising a mounting seat 501, a wire tray 502, a fixing plate 503, a protective shell 504, a first fixing seat 505, a second fixing seat 506, a protection tube 507 and a raw material wire 508, wherein the mounting seat 501 is arranged on the upper portion of a support column of the base 1, the wire tray 502 is rotatably arranged on the mounting seat 501, the fixing plate 503 is detachably arranged on the upper portion of the mounting seat 501, which is close to one side of the wire tray 502, the protective shell 504 shields and protects the upper half of the wire tray 502, the fixing seat is arranged at the bottom of each mounting seat 501, which is close to one side of the wire tray 502, a plurality of second fixing seats 506 are arranged at the top of the support frame 403, the protection tube 507 is connected between the bottom of the first fixing seat 505 and the top of the second fixing seat 506, the raw material wire 508 is wound in the wire tray 502, and the output end of the raw material wire 508 sequentially penetrates through the first fixing seat 505, the protection tube 507 and the second fixing seat 506 to enter the spray head 306 for hot melting processing.

When in use, a worker winds the raw material wire 508 to be used in the wire tray 502 and installs the raw material wire 508 on the installation seat 501, then connects the raw material wire 508 to the spray heads 306 one by one through the first fixed seat 505, the protective tube 507 and the second fixed seat 506, connects the device with a computer, controls the hot bed assembly 2 to move the hot bed to an initial position through input data, then starts the first spray head 306 to prepare the raw material wire 508 for hot melting, in the initial state, the extrusion wheel 404 extrudes the convex block 402 at the position of the first spray head 306 downwards, the spray pipe of the first spray head 306 is lower than other spray heads 306, other spray heads 306 are prevented from interfering with the printing process, after the first spray head 306 is prepared, the moving assembly 301 drives the square seat 302 and the spray heads 306 to move at the top of the hot bed for printing, other materials or the spray heads 306 which are not used temporarily keep the state of being not started, the protection tube 507 can guide and protect the raw material line 508 in the process of moving the spray head 306, avoid the breakage or excessive deformation of the raw material line 508, when a printing material or color needs to be changed, the computer starts the first servo motor 406 to drive the gear-lack 407 to rotate, because the gear ratio of the gear-lack 407 to the first full gear 405 changes along with the number of the spray heads 306, when the spray head 306 needs to be used for printing, the computer drives the gear-lack 407 to rotate for a certain circle number through the first servo motor 406, thereby driving the extrusion wheel 404 to extrude the bump 402 at the position of the spray head 306 downwards through the first full gear 405, the computer immediately controls the spray head 306 to operate, and the spray head 306 used before moves upwards to reset under the action of the first elastic element 4021, so that the switching of the spray head 306 can be completed without the need of disassembling and replacing the spray head 306, the maximum number of the spray heads 306 can be controlled only by replacing the square seat 302, the intelligent control effect is achieved easily and simply, the processing steps are reduced, and meanwhile, the use problem of the device caused by abrasion is avoided.

Example 2

As shown in fig. 7 and 8, based on embodiment 1, the trigger mechanism 6 specifically further includes a fixing frame 601, sensing contacts 602 and a data connection line 603, the bottom of the square seat 302 is provided with the fixing frame 601, the top of the inner side of the fixing frame 601 and the position right below the nozzle 306 are all provided with the sensing contacts 602, and the data connection line 603 is provided between the fixing frame 601 and the square seat 302, so as to be electrically connected with the device controller.

When the nozzle 306 is pressed by the pressing wheel 404 to the downward operation position of the bump 402, the lower part of the nozzle 306 is contacted with the sensing contact 602 on the fixed frame 601, the sensing contact 602 is arranged at the lower position of each nozzle 306 on the fixed frame 601, when the nozzle 306 needs to be used, the nozzle 306 is released from the sensing contact 602 downward under the action of the pressing wheel 404, then the pressing contact transmits signals to the computer through the data connection line 603, and the computer immediately controls the nozzle 306 at the position to operate, so that the device can more accurately control which nozzle 306 starts to print, and errors in control of the nozzle 306 are avoided.

As shown in fig. 9 and 10, on the basis of embodiment 1, the device specifically further comprises a feeding mechanism 7, and specifically comprises a supporting seat 701, friction wheels 702, a second servo motor 703 and a second full gear 704, wherein two supporting seats 701 are respectively arranged at the top of the first fixing seat 505, the friction wheels 702 are respectively arranged on the supporting seats 701, the friction wheels 702 on the same first fixing seat 505 are mutually close, a raw material wire 508 passes through between the two friction wheels 702 and is in friction fit with the two friction wheels 702, the first fixing seat 505 is respectively provided with the second servo motor 703, the second servo motor 703 is respectively connected with one friction wheel 702 through a coupling, the second full gears 704 are respectively arranged on wheel shafts of the friction wheels 702, and the two friction wheels 702 of the same first fixing seat 505 are respectively in transmission fit through the second full gears 704.

When the spray head 306 is used, the second servo motor 703 drives the friction wheel 702 to slowly transmit the material line 508 to the spray head 306, the transmission quantity changes along with the rotation speed of the friction wheel 702, and meanwhile, the material line 508 is transmitted to the spray head 306 between the first fixing seat 505 and the wire tray 502, so that the problem that when the moving assembly 301 drives the spray head 306 to move, the material line 508 in the protection tube 507 breaks, and the material line 508 cannot be continuously transmitted to the spray head 306 is avoided.

As shown in fig. 11 to 13, on the basis of embodiment 1, the device specifically further comprises a limiting mechanism 8, and specifically comprises a fixing frame 801, a clamping block 802 and a second elastic member 803, wherein the fixing frame 801 is arranged in the middle of the top of the supporting frame 403, the fixing frame 801 is located right above the first full gear 405, the clamping blocks 802 are symmetrically and slidably arranged on two sides of the inside of the fixing frame 801, the clamping blocks 802 are in clamping fit with the first full gear 405, and the second elastic member 803 is arranged between one side, away from the first full gear 405, of the clamping blocks 802 and the fixing frame 801.

The protection tube 507 is a metal braided tube.

When in a static state, clamping blocks 802 on two sides of a fixing frame 801 clamp and limit a first full gear 405 under the action of a second elastic piece 803, the extrusion wheel 404 is prevented from being influenced by other factors to rotate so as to change the running state of a printing spray head 306, and when a first servo motor 406 drives the first full gear 405 to rotate through a gear lack 407, the force applied by the first full gear 405 can extrude the clamping blocks 802 to move towards a square shape of a compressed second elastic piece 803, so that the normal running of the spray head 306 switching is ensured while the full gear is limited. The metal braided tube can protect the raw material line 508 well as the protection tube 507, when the moving assembly 301 drives the spray head 306 to move up and down, the raw material line 508 is prevented from being deformed to a large extent, the elasticity of the metal braided tube is strong, the metal braided tube can be quickly restored to an initial state after being deformed, and the raw material line 508 is better guided.

Example 3

As shown in fig. 14, the embodiment of the present invention further provides a 3D printing method, which uses the 3D printer described in the above embodiment to print, and the printing steps are as follows:

s1, importing 3D data into a computer, and establishing data connection with a 3D printer;

s2, selecting a square seat 302, a proper number of printing spray heads 306, a hot bed, a spray head temperature and a hot bed temperature according to model requirements;

s3, properly loading printing materials to each printing nozzle 306, and setting an initial printing position;

s4, performing printing work;

s5, taking out the printing finished product from the printer for subsequent steps, and cleaning and maintaining the printing nozzle.

The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.

Claims (9)

1. A multi-nozzle fusion technique 3D printer comprising:

the device comprises a base (1) and a hot bed assembly (2), wherein the hot bed assembly (2) used for placing the hot bed and driving the hot bed to move is arranged in the middle of the top of the base (1);

printing mechanism (3), base (1) top both sides position symmetry is equipped with the support column, and the support column upper portion of base (1) is equipped with and drives printing mechanism (3) that a plurality of shower nozzles (306) carried out the removal and print:

the pushing mechanism (4), the printing mechanism (3) is provided with the pushing mechanism (4) which is convenient for switching the printing spray head (306):

wire coil mechanism (5), the support column top of base (1) both sides is equipped with wire coil mechanism (5) that receive raw materials line (508).

2. A multi-nozzle fusion technique 3D printer according to claim 1, characterized in that the printing mechanism (3) further comprises:

the movable assembly (301) is arranged between the upper parts of the support columns at two sides of the base (1), and the movable assembly (301) comprises a fixed part fixed with the support columns of the base (1) and a movable part freely moving on the fixed part;

the square seat (302) is arranged on the moving part of the moving assembly (301), and a plurality of mounting holes for placing the spray heads (306) are formed in the square seat (302);

the installation sleeves (304) are arranged in the installation holes of the square seats (302) in a sliding manner;

the sliding block (305) is arranged on each side wall of the outer side of the installation sleeve (304), each side wall of the installation hole of the square seat (302) is provided with a square groove (303), and the sliding block (305) slides in the square groove (303);

the spray head (306) is arranged on the inner side of the mounting sleeve (304), and is in mounting fit with the square seat (302) through the mounting sleeve (304).

3. A multi-nozzle fusion technique 3D printer according to claim 2, wherein the pushing mechanism (4) further comprises:

the spray heads (306) are circumferentially arranged around the horizontal center of the square seat (302) on the square seat (302), sliding grooves (401) are formed in the middle position of the top of the square seat (302), the horizontal shape of the sliding grooves (401) changes along with the number of the spray heads (306), meanwhile, the square grooves (303) are communicated with the sliding grooves (401) and the mounting holes of the square seat (302), one side, close to the center of the square seat (302), of the mounting sleeve (304) is provided with the protruding blocks (402) through the sliding blocks (305), and the protruding blocks (402) slide in the sliding grooves (401);

the first elastic piece (4021) is arranged between the lug (402) and the bottom of the chute (401);

the support frame (403) is arranged at the top of the square seat (302);

the extrusion wheel (404) is rotatably arranged at the middle position of the bottom of the support frame (403), and the wheel shaft of the extrusion wheel (404) penetrates through the support frame (403);

a first full gear (405), wherein the upper part of the wheel shaft of the extrusion wheel (404) is provided with the first full gear (405);

the first servo motor (406), the first servo motor (406) is arranged at the bottom of the supporting frame (403);

the top of the support frame (403) is rotatably provided with a gear lack (407), the gear lack (407) is meshed with the first full gear (405), the gear ratio of the gear lack (407) and the first full gear (405) changes along with the number of the spray heads (306), and the gear lack (407) is connected with an output shaft of the first servo motor (406) through a coupler.

4. A multi-nozzle fusion technique 3D printer according to claim 3, characterized in that the spool mechanism (5) further comprises:

the mounting seat (501) is arranged at the upper part of the supporting column of the base (1);

the wire tray (502) is rotationally arranged on the mounting seat (501);

a fixed disc (503), wherein the upper part of one side of the installation seat (501) close to the wire tray (502) is provided with the fixed disc (503); the protective shell (504) is detachably arranged on the fixed disc (503), and the upper half part of the wire tray (502) is shielded and protected by the protective shell (504);

the first fixing seats (505), wherein the bottom of one side of each installation seat (501) close to the wire tray (502) is provided with a fixing seat;

the top of the support frame (403) is provided with a plurality of second fixing seats (506);

the protection tube (507) is connected between the bottom of the first fixed seat (505) and the top of the second fixed seat (506);

the material line (508), the material line (508) is winded in the wire tray (502), and the output end of the material line (508) sequentially passes through the first fixing seat (505), the protection tube (507) and the second fixing seat (506) to enter the spray head (306) for hot melting processing.

5. A multi-nozzle fusion technique 3D printer according to claim 4, characterized in that it further comprises a triggering mechanism (6), comprising in particular:

a fixed frame (601), wherein the bottom of the square seat (302) is provided with the fixed frame (601);

the induction contacts (602) are arranged at the top of the inner side of the fixed frame (601) and are positioned right below the spray heads (306);

and a data connecting wire (603), wherein the data connecting wire (603) is arranged between the fixed frame (601) and the square seat (302) so as to be electrically connected with the device controller.

6. A multi-nozzle fusion technique 3D printer according to claim 5, characterized in that it further comprises a feeding mechanism (7), comprising in particular:

the top of the first fixing seat (505) is provided with two supporting seats (701);

the friction wheels (702) are arranged on the supporting seat (701), the friction wheels (702) on the same first fixing seat (505) are close to each other, and the raw material line (508) passes through between the two friction wheels (702) and is in friction fit with the two friction wheels (702);

the second servo motors (703) are arranged on the first fixing seats (505), and the second servo motors (703) are respectively connected with one friction wheel (702) through a coupling;

and the wheel shafts of the friction wheels (702) are respectively provided with a second full gear (704), and the two friction wheels (702) of the same first fixing seat (505) are in transmission fit through the second full gears (704).

7. A multi-nozzle fusion technique 3D printer according to claim 6, characterized in that it further comprises a limiting mechanism (8), comprising in particular:

the middle position of the top of the support frame (403) is provided with the fixing frame (801), and the fixing frame (801) is positioned right above the first all-gear (405);

the clamping blocks (802) are symmetrically and slidably arranged on two sides of the inside of the fixing frame (801), and the clamping blocks (802) are matched with the first full gear (405) in a clamping manner;

and a second elastic piece (803) is arranged between one side of the clamping block (802) far away from the first full gear (405) and the fixing frame (801).

8. A multi-nozzle fusion technique 3D printer according to claim 4, characterized in that the protective tube (507) is a metal braided tube.

9. A printing method of a 3D printer of a multi-nozzle fusion technique, characterized in that the 3D printer of a multi-nozzle fusion technique according to any one of claims 1 to 8 is applied, comprising the steps of:

s1, importing 3D data into a computer, and establishing data connection with a 3D printer;

s2, selecting a square seat (302), a proper number of printing spray heads (306), a hot bed, a spray head temperature and a hot bed temperature according to model requirements;

s3, properly loading printing materials to each printing nozzle (306), and setting an initial printing position;

s4, performing printing work;

s5, taking out the printing finished product from the printer for subsequent steps, and cleaning and maintaining the printing nozzle.