CN113263721A

CN113263721A - Three-nozzle layered collaborative printing method and three-nozzle 3D printer

Info

Publication number: CN113263721A
Application number: CN202110641580.2A
Authority: CN
Inventors: 马连华; 宋子臻; 王林; 周伟; 刘佳
Original assignee: Heibei University
Current assignee: Heibei University
Priority date: 2021-06-09
Filing date: 2021-06-09
Publication date: 2021-08-17
Anticipated expiration: 2041-06-09
Also published as: CN113263721B

Abstract

The invention relates to a three-nozzle layered collaborative printing method and a three-nozzle 3D printer, wherein the three-nozzle printing method is used for simultaneously printing the same workpiece model by three nozzles, respectively printing the left area and the right area of the same printing layer by a left nozzle and a right nozzle, respectively printing the middle area of the adjacent printing layer above the left nozzle and the right nozzle by an upper nozzle, and printing the whole workpiece model by the three nozzles in a layered and partitioned manner by adjusting the distance between the nozzles and a printing platform. The three-nozzle 3D printer is a 3D printer specially used for realizing the printing method, can drive the three nozzles to move along an X axis and a Y axis respectively, and can adjust the height of a printing platform so as to control the distance between the nozzles and the printing platform. The method is simple to operate, seamless connection among the partitions is realized in a mode of layered and partitioned printing of the three nozzles, mutual interference among the multiple nozzles is avoided, and the time for printing a single workpiece model is shortened by times.

Description

Three-nozzle layered collaborative printing method and three-nozzle 3D printer

Technical Field

The invention relates to a 3D printing technology, in particular to a three-nozzle layered collaborative printing method and a three-nozzle 3D printer.

Background

The 3D printing technology is a fast forming technology, which is a technology for forming an object by using forming materials such as metal, plastic, photosensitive resin and the like in a layer-by-layer printing mode on the basis of a digital three-dimensional model file, and belongs to additive manufacturing. At present, a 3D printer based on Fused Deposition Modeling (FDM) principle has become a 3D printer with the highest popularity due to the advantages of simple structure, rich types of applicable materials, low cost of equipment and consumables and the like.

The FDM printer is formed by melting printing consumables, extruding the printing consumables into threads, and slowly stacking and depositing the printing consumables from a point to a line to a surface, so that the printing efficiency is lower compared with the 3D printing technology of a surface forming process, and the application of the technology is limited. At present, the improvement of the 3D printing efficiency mainly stays in two methods, namely, the printing speed is improved by reducing the printing precision; second, the printing speed is increased by reducing the internal filling. Increasing the layer thickness leads to lower printing precision, so that the surface of the model becomes rough; reducing the internal filling changes the internal structure of the printed product, reducing its strength. Increasing the efficiency by simply increasing the layer thickness is therefore not an ideal option.

Currently, in fused deposition type 3D printing, single and dual head printers are widely used. When the single-nozzle printer is used for printing, the products are displayed by stacking the materials discharged by the single nozzle layer by layer, and the printed products are too single in color, so that the products are monotonous and lack of attraction, and the printing efficiency is low. The existing double-nozzle printer is divided into two types, one type uses two materials, but the double nozzles cannot work simultaneously, when one nozzle works, the other nozzle can only stand by at one side, and the printing efficiency is not high; another type of dual head printer, such as the independent multi-nozzle 3D printer of utility model patent application No. 201921037491.1, can print multiple workpieces simultaneously with multiple nozzles, but the printing efficiency is still slow for a single workpiece. Therefore, a 3D printing technology for simultaneously printing one workpiece by a plurality of nozzles is needed.

Disclosure of Invention

The invention aims to provide a three-nozzle layered collaborative printing method, which solves the problem that the printing efficiency is low because multiple nozzles of the existing 3D printer cannot collaboratively print the same workpiece.

The invention also aims to provide a three-nozzle 3D printer to solve the problem of low printing efficiency of the existing 3D printer.

One of the objects of the invention is achieved by: a three-nozzle layered collaborative printing method is provided, a left nozzle and a right nozzle which are positioned at the same height are arranged, an upper nozzle which is higher than the left nozzle and the right nozzle by a printing layer thickness is arranged between the left nozzle and the right nozzle, a printing platform is arranged below the upper nozzle, and the relative distances between the printing platform and the left nozzle, the right nozzle and the upper nozzle are adjustable, and comprises the following steps:

a. horizontally cutting the designed workpiece model into a plurality of layers by using slicing software, wherein the thickness of each layer is consistent with that of the printing layer;

b. planning a path of each layer of the workpiece model from bottom to top;

c. adjusting the distance H between the left nozzle, the right nozzle and the printing platform to make the distance H between the lower ports of the left nozzle and the right nozzle and the printing platform equal to the thickness of one printing layer;

d. before the printing work of the first printing layer is carried out, the upper spray head moves forwards to move out of the printing area, the right spray head is far away from the middle line of the printing area, and the left spray head moves to the middle line of the printing area;

e. the left sprayer prints the central area, after the width of the material to be printed is larger than the distance L between the nozzles of the left sprayer and the right sprayer, the right sprayer is involved, and the left sprayer and the right sprayer simultaneously print the first printing layer of the workpiece;

f. when the distance D between the left spray head and the right spray head is larger than the width of the upper spray head, the upper spray head is involved, and the upper spray head prints a second printing layer by taking the center line of the second printing layer as an initial position on the basis of the first printing layer;

g. after the left sprayer and the right sprayer complete printing of the first printing layer together, the distance H between the printing platform and the left sprayer or the right sprayer is increased by the thickness of one printing layer, the left sprayer and the right sprayer are located on the second printing layer, and the upper sprayer is located on the third printing layer;

h. the left sprayer and the right sprayer continue to print the second printing layer on the basis of the existing material of the second printing layer, and when the distance D between the left sprayer and the right sprayer is larger than the width of the upper sprayer, the upper sprayer starts to print a third printing layer on the basis of the material of the second printing layer;

i. and repeating the steps until the whole workpiece is printed.

And after the left spray head and the right spray head finish printing of a certain layer, waiting for the upper spray head to finish the straight line which is being printed by the upper spray head, and then increasing the thickness of a printing layer by the distance H between the printing platform and the left spray head or the right spray head.

Left side shower nozzle and right side shower nozzle are the booth apart from the shower nozzle, the booth is apart from the shower nozzle and includes the horizontally inlet pipe the tip of inlet pipe is provided with the throat of downwarping the lower port of throat is provided with the nozzle that opens downwardly, just the nozzle of left side shower nozzle with the nozzle of right side shower nozzle all is located the inboard.

The heat pipe is characterized in that a radiating fin is arranged on the feeding pipe, a fan is arranged on the radiating fin, the throat pipe penetrates through the heating block, and a heating rod penetrates through the heating block.

The second purpose of the invention is realized by the following steps: a three-nozzle 3D printer comprises a rack, wherein two first X-axis movement mechanisms are arranged on the rack, two first Y-axis movement mechanisms are arranged between the two first X-axis movement mechanisms, a left nozzle is arranged on one first Y-axis movement mechanism, a right nozzle is arranged on the other first Y-axis movement mechanism, two second X-axis movement mechanisms are arranged above the first X-axis movement mechanisms, a second Y-axis movement mechanism is arranged between the two second X-axis movement mechanisms, an upper nozzle is arranged on the second Y-axis movement mechanism, the upper nozzle is positioned between the left nozzle and the right nozzle, and the upper nozzle is higher than the thickness of a printing layer of the left nozzle and the right nozzle; the automatic printing machine is characterized in that a vertical lead screw and a vertical feed bar are arranged on the rack, a printing platform is arranged on the lead screw and the feed bar, the lead screw and the feed bar penetrate through the printing platform, a lead screw nut is fixed on the printing platform, the lead screw nut and the lead screw are connected in a screwing manner, and the lead screw is driven by a motor to drive the printing platform to move along the lead screw.

The left side shower nozzle with right side shower nozzle is the booth apart from the shower nozzle, the booth is apart from the shower nozzle and is included the horizontally inlet pipe the tip of inlet pipe is provided with the throat of downwarping the lower port of throat is provided with the nozzle that the opening is decurrent.

First X axle motion, second X axle motion, first Y axle motion and second Y axle motion all include the horizontally slide rail the both ends of slide rail are provided with the pivot, install the belt in two pivots be provided with the slider on the slide rail, the slider by belt drive removes, one be provided with step motor in the pivot, by step motor drive the pivot is rotated.

The three-nozzle printing method realizes the layered and partitioned collaborative printing of the three nozzles, the three nozzles simultaneously print the same workpiece model, and the working area and how to connect each nozzle are limited by partitioning and layering, so that the three nozzles are ensured to cooperate with each other without interference, and the printing efficiency of 3D printing is greatly improved. Go up the lower port of shower nozzle and print the thickness on layer than left shower nozzle and right shower nozzle one higher, it just lies in two with left shower nozzle/right shower nozzle to go up the shower nozzle like this and prints the layer, can print the work simultaneously to two printing layers, and to left shower nozzle and right shower nozzle, two shower nozzles divide the subregion and print, can print printing the layer fast, when printing certain one deck at left shower nozzle and right shower nozzle, it prints the top one deck to go up the shower nozzle, and can accomplish the printing on place layer at left shower nozzle and right shower nozzle when, it has accomplished the printing of certain width to the top one deck to go up the shower nozzle, when the printing work on this layer is handed with left shower nozzle and right shower nozzle like this, do not avoid handling at needs, can directly print, the process of printing has been accelerated.

In order to enable the right sprayer to participate in printing earlier, the left sprayer and the right sprayer adopt a novel small-distance sprayer, the feeding pipe is set to be in a horizontal state, the end part of the feeding pipe is provided with a throat pipe bent downwards, the lower port of the throat pipe is provided with a nozzle with a downward opening, and the nozzle of the left sprayer and the nozzle of the right sprayer are both positioned on the inner side, so that when the left sprayer and the right sprayer are close to each other, the distance L between the two nozzles is small. As long as the left nozzle prints out the material with the width larger than L on the printing layer, the right nozzle can intervene to print, the printing speed of the two nozzles is certainly larger than that of one nozzle, and the printing efficiency of the right nozzle is higher as the right nozzle participates in printing. Meanwhile, the distance between the nozzles of the two spray heads is small, so that the size of a workpiece which can be printed by the spray heads is small, and the size of the workpiece which can be applied by the spray heads is smaller.

The method is simple to operate, seamless connection among the partitions is realized in a mode of layered and partitioned printing of the three nozzles, mutual interference among the multiple nozzles is avoided, and the time for printing a single workpiece model is shortened by times.

Drawings

FIG. 1 is a schematic diagram of three-nozzle layered zoned printing according to the present invention.

Fig. 2 is an internal structure view of the three-nozzle 3D printer of the present invention.

Fig. 3 is a structural view of a left head and a right head of the present invention.

In the figure: 1. a first printing layer; 2. a second print layer; 3. a left spray head; 4. a right nozzle; 5. an upper spray head; 6. a first X-axis motion mechanism; 7. a first Y-axis movement mechanism; 8. a second X-axis motion mechanism; 9. a second Y-axis movement mechanism; 10. a slide rail; 11. a stepping motor; 12. a belt; 13. a slider; 14. a printing platform; 15. a lead screw; 16. a lead screw nut; 17. a polished rod; 18. a fixed seat; 19. a fan; 20. a heating block; 21. a heating rod; 22. a feed pipe; 23. a heat sink; 24. a nozzle; 25. a throat pipe.

Detailed Description

As shown in fig. 1, in the three-nozzle layered collaborative printing method of the present invention, first, a left nozzle 3 and a right nozzle 4 located at the same height are provided, an upper nozzle 5 higher than the left nozzle 3 and the right nozzle 4 by a printing layer thickness is provided between the left nozzle 3 and the right nozzle 4, a printing platform is provided below the upper nozzle, and the relative distances between the printing platform 14 and the left nozzle 3, the right nozzle 4 and the upper nozzle 5 are adjustable.

When printing is performed, the specific steps are as follows.

a. And horizontally dividing the designed workpiece model into a plurality of layers by using slicing software, wherein the thickness of each layer is consistent with that of the printing layer.

b. And planning a path of each layer of the workpiece model from bottom to top.

The three nozzles move along a straight line, the nozzles firstly move along one direction of a Y axis, after printing of one line is finished, the nozzles move along an X axis by a line width distance, and the nozzles move along the opposite direction of the Y axis to print a second line, so that printing of one area surface is finished in a reciprocating mode. And the left head 3 is responsible for printing of the left half area, the right head 4 is responsible for printing of the right half area, and the upper head 5 is mainly responsible for printing of the middle area except the first printing layer 1.

c. The distance H between the left and

right heads

3 and 4 and the printing platform 14 is adjusted so that the distance H between the lower ports of the left and

right heads

3 and 4 and the printing platform 14 is equal to the thickness of one printing layer. The material thus ejected by the left and

right heads

3, 4 directly forms the first printed layer 1 of the workpiece model.

d. Before the printing work of the first printing layer 1 is carried out, the upper spray head 5 moves forwards and moves out of the printing area, the right spray head 4 is far away from the middle line of the printing area, and the left spray head 3 moves to the middle line of the printing area.

When printing first printing layer 1, need avoid each other between the three shower nozzle and prevent to take place to interfere, right side shower nozzle 4 avoids left shower nozzle 3, goes up shower nozzle 5 and avoids left shower nozzle 3 and right shower nozzle 4.

e. The left spray head 3 prints the central area, after the width of the material to be printed is larger than the distance L between the nozzle 24 of the left spray head 3 and the nozzle 24 of the right spray head 4, the right spray head 4 is involved, and the left spray head 3 and the right spray head 4 simultaneously perform the printing work of the first printing layer 1 of the workpiece.

Left side shower nozzle 3 and right side shower nozzle 4 print respectively about two regions, and the first layer 1 of printing of work piece model is printed by two shower nozzles of left shower nozzle 3 and right shower nozzle 4 simultaneously, and its printing efficiency is greater than the printing efficiency of a shower nozzle far away.

f. After the distance D between the left nozzle 3 and the right nozzle 4 is greater than the width of the upper nozzle 5, the upper nozzle 5 is involved, and the upper nozzle 5 prints the second printing layer 2 with the center line of the second printing layer 2 as the initial position on the basis of the first printing layer 1.

Go up shower nozzle 5 and intervene the back, carry out the printing of second printing layer 2 on the basis of the existing material of first printing layer 1, and go up shower nozzle 5 and mainly carry out the printing of middle zone, go up shower nozzle 5 and can expand the printing by central line both sides according to the condition, also can expand the printing by central line one side that the printing area is big, for left shower nozzle 3 and right shower nozzle 4 on next step alleviate work load, thereby improve printing efficiency.

g. After the left spray head 3 and the right spray head 4 finish printing the first printing layer 1 together, the distance H between the printing platform 14 and the left spray head 3 or the right spray head 4 is increased by the thickness of one printing layer, at the moment, the left spray head 3 and the right spray head 4 are positioned on the second printing layer 2, and the upper spray head 5 is positioned on the third printing layer, so that preparation is made for further printing of a workpiece model.

h. The left spray head 3 and the right spray head 4 continue to print the second printing layer 2 on the basis of the existing material of the second printing layer 2, and when the distance D between the left spray head 3 and the right spray head 4 is larger than the width of the upper spray head 5, the upper spray head 5 starts to print the third printing layer on the basis of the material of the second printing layer 2.

Because the upper nozzle 5 has already printed the middle area of the second printing layer 2, and the width of the area printed by the upper nozzle 5 is greater than the distance L between the nozzle 24 of the left nozzle 3 and the nozzle 24 of the right nozzle 4 under normal conditions, the left nozzle 3 and the right nozzle 4 can directly print after coming to the second printing layer 2 without performing evasion treatment, thereby improving the printing speed.

Except that the first printing layer 1 needs the right nozzle 4 to avoid before printing is started, the right nozzle 4 is not needed to avoid in printing of other layers generally, but directly participates in printing. If special conditions are met, the width of an area printed by the upper spray head 5 is too small, at the moment, the right spray head 4 is required to avoid, the left spray head 3 firstly works until the width of the material is larger than L, or the upper spray head 5 is firstly waited to continuously print until the width of the material is larger than L, and then the height difference between the printing platform 14 and the spray head is adjusted.

i. And by parity of reasoning, the three nozzles finish printing each layer of the workpiece model layer by layer until the whole workpiece is printed.

When the left nozzle 3 and the right nozzle 4 finish printing on a certain layer, the upper nozzle 5 waits for finishing the straight line being printed, and then the distance H between the printing platform 14 and the left nozzle 3 or the right nozzle 4 is increased by the thickness of one printing layer. If the upper spray head 5 does not finish printing the straight line, the distance between the printing platform 14 and the spray head is directly adjusted, the left spray head 3 or the right spray head 4 is needed to continue to connect the unfinished straight line, on one hand, time is needed to be spent on adjusting the position of the spray head to finish the continuous connection, on the other hand, the precision requirement on the position of the spray head is high during the continuous connection, the position of the spray head needs to be accurately positioned on a certain point position of a certain line, and once the position of the spray head is wrong, the printing quality of the whole workpiece model is influenced.

As shown in fig. 3, the left and

right heads

3 and 4 are small-pitch heads, the small-pitch head includes a horizontal feed pipe 22, a throat 25 bent downward is provided at an end of the feed pipe 22, a nozzle 24 opened downward is provided at a lower port of the throat 25, and the nozzle 24 of the left head 3 and the nozzle 24 of the right head 4 are both located inside. The nozzles 24 are no longer located below the spray head as in conventional spray heads, but are located on one side of the spray head, with the nozzles 24 on the right side for the left spray head 3 and the nozzles 24 on the left side for the right spray head 4, so that the spacing between the nozzles 24 of the two spray heads can be small when the left spray head 3 and the right spray head 4 are close to each other.

The feed pipe 22 is provided with a radiating fin 23, the radiating fin 23 is provided with a fan 19, a throat 25 passes through the heating block 20, and a heating rod 21 passes through the heating block 20. The temperature of the material ejected from the nozzle 24 is controlled by the cooperative work of the heating rod 21 and the heat sink 23, thereby enabling the ejected material to be rapidly set.

For the conventional head, due to the arrangement of the heat sink 23 and the fan 19, when the two heads are close to each other, the distance between the two nozzles 24 is larger, the larger distance between the nozzles 24 increases the printing load of the left head 3 during printing, the right head 4 can be involved to start the printing work only when the material to be printed is wide enough, the later the right head 4 is involved, the lower the overall printing efficiency is, and the greater the possibility that the width of the area where the upper head 5 has completed does not satisfy the intervention condition of the right head 4 during the subsequent printing of the printing layer is.

The distance L between the nozzles 24 of the left head 3 and the nozzles 24 of the right head 4 refers to the distance between the centers of the ports of the two nozzles 24, the distance D between the left head 3 and the right head 4 refers to the size of the gap between the two heads, and the distance H between the printing platform 14 and the left head 3 or the right head 4 is the height difference between the upper surface of the printing platform 14 and the lower ports of the nozzles 24 of the left head 3 or the right head 4.

As shown in fig. 2, the three-nozzle 3D printer of the present invention includes a frame, two first X-axis movement mechanisms 6 are disposed on the frame, two first Y-axis movement mechanisms 7 are disposed between the two first X-axis movement mechanisms 6, a left nozzle 3 is disposed on one first Y-axis movement mechanism 7, a right nozzle 4 is disposed on the other first Y-axis movement mechanism 7, two second X-axis movement mechanisms 8 are disposed above the first X-axis movement mechanism 6, a second Y-axis movement mechanism 9 is disposed between the two second X-axis movement mechanisms 8, an upper nozzle 5 is disposed on the second Y-axis movement mechanism 9, the upper nozzle 5 is located between the left nozzle 3 and the right nozzle 4, and the upper nozzle 5 is higher than the left nozzle 3 and the right nozzle 4 by the thickness of one printing layer; the vertical screw rod 15 and the light bar 17 are arranged on the rack, the printing platform 14 is arranged on the screw rod 15 and the light bar 17, the screw rod 15 and the light bar 17 penetrate through the printing platform 14, a screw rod nut 16 is fixed on the printing platform 14, the screw rod nut 16 is connected with the screw rod 15 in a screwing mode, and the screw rod 15 is driven by a motor to drive the printing platform 14 to move along the screw rod 15.

The bearings are respectively installed at two ends of the screw rod 15 and fixed on the rack, two ends of the screw rod 15 are respectively fixed through the fixing seats 18, the fixing seats 18 are fixed on the rack, the number of the optical levers 17 is two, the optical levers are respectively located on two sides of the screw rod 15, and when the printing platform 14 is driven by the screw nut 16 to move up and down, the optical levers 17 play a role in guiding and supporting the printing platform 14.

The three nozzles are divided into two heights, wherein the left nozzle 3 and the right nozzle 4 are positioned at the same height, the upper nozzle 5 is higher than the left nozzle 3 and the right nozzle 4 by one printing layer, and the height difference among the three nozzles is fixed. The distance H between the printing platform 14 and the left or

right head

3 or 4 can be controlled by adjusting the height of the head or adjusting the height of the printing platform 14.

Because the left nozzle 3, the right nozzle 4 and the upper nozzle 5 are all installed on the moving mechanisms in the X direction and the Y direction, the moving mechanisms are required to be moved simultaneously when the nozzles are moved in the Z-axis direction, more energy sources are required to be consumed, and the stability is poor. Therefore, the mode of adjusting the height of the printing platform 14 is adopted, the printing platform 14 is driven by the lead screw nut 16 mechanism to move along the Z-axis direction, the printing platform 14 is small in mass and not connected with other complex mechanisms, and meanwhile, a workpiece model printed on the printing platform 14 is light in mass due to the material, so that the workpiece model can stably move along the Z-axis direction.

As shown in fig. 3, the left nozzle 3 and the right nozzle 4 are small-pitch nozzles, the small-pitch nozzles include a horizontal feed pipe 22, a throat 25 bent downward is provided at an end of the feed pipe 22, a nozzle 24 opened downward is provided at a lower port of the throat 25,

the feed pipe 22 is provided with a radiating fin 23, the radiating fin 23 is provided with a fan 19, a throat 25 passes through the heating block 20, and a heating rod 21 passes through the heating block 20.

The first X-axis movement mechanism 6, the second X-axis movement mechanism 8, the first Y-axis movement mechanism 7 and the second Y-axis movement mechanism 9 comprise horizontal sliding rails 10, rotating shafts are arranged at two ends of each sliding rail 10, belts 12 are installed on the two rotating shafts, sliding blocks 13 are arranged on the sliding rails 10, the sliding blocks 13 are driven to move by the belts 12, stepping motors 11 are arranged on one rotating shaft, and the rotating shafts are driven to rotate by the stepping motors 11.

Two ends of the first Y-axis mechanism are respectively fixed on the sliding blocks 13 of the first X-axis movement mechanisms 6, and two sliding blocks 13 are installed on each first X-axis movement mechanism 6, so that two first Y-axis movement mechanisms 7 are installed between the two parallel first X-axis movement mechanisms 6, and the two first Y-axis movement mechanisms 7 move along the X-axis direction on the same plane. Two parallel second X-axis motion mechanisms 8 are positioned right above the two first X-axis motion mechanisms 6, two ends of one second Y-axis motion mechanism 9 are respectively fixed on sliding blocks 13 of the two second X-axis motion mechanisms 8, and the second Y-axis motion mechanism 9 moves along the X-axis direction. This kind of arrangement can make left shower nozzle 3 and right shower nozzle 4 divide the left and right region on same printing layer and carry out the subregion and print, and upper nozzle 5 is located two adjacent printing layers with left shower nozzle 3, right shower nozzle 4 to can carry out the layering and print.

The three-nozzle printing method realizes the layered and partitioned collaborative printing of the three nozzles, the three nozzles simultaneously print the same workpiece model, and the working area and how to connect each nozzle are limited by partitioning and layering, so that the three nozzles are ensured to cooperate with each other without interference, and the printing efficiency of 3D printing is greatly improved. Go up the lower port of shower nozzle 5 and be higher than left shower nozzle 3 and right shower nozzle 4 a thickness of printing the layer, go up shower nozzle 5 just so and be located two with left shower nozzle 3/right shower nozzle 4 and print the layer, can print the work to two simultaneously, and to left shower nozzle 3 and right shower nozzle 4, two shower nozzles divide the regional printing, can print printing the layer fast, when printing certain one deck at left shower nozzle 3 and right shower nozzle 4, it prints the top one deck to go up shower nozzle 5, and can accomplish the printing on place layer at left shower nozzle 3 and right shower nozzle 4, it has accomplished the printing of certain width to go up shower nozzle 5, when the printing work on this layer is handed in left shower nozzle 3 and right shower nozzle 4 like this, do not handle at needs, can directly print, the process of printing has been evaded.

In order to enable the right nozzle 4 to participate in printing earlier, a new small-distance nozzle is adopted for the left nozzle 3 and the right nozzle 4, the feeding pipe 22 is set to be in a horizontal state, the end part of the feeding pipe is provided with a throat 25 which is bent downwards, the lower port of the throat 25 is provided with a nozzle 24 with a downward opening, and the nozzle 24 of the left nozzle 3 and the nozzle 24 of the right nozzle 4 are both positioned at the inner side, so that when the left nozzle 3 and the right nozzle 4 are close to each other, the distance L between the two nozzles 24 is small. As long as left shower nozzle 3 prints out the material that width is greater than L at the printing layer, right shower nozzle 4 just can intervene and print, and the printing speed of two shower nozzles certainly is greater than the printing speed of a shower nozzle, and right shower nozzle 4 participates in and prints earlier, and its printing efficiency is also higher. Meanwhile, because the distance between the nozzles 24 of the two spray heads is small, the size of the workpiece which can be printed by the spray heads is small, and the size of the workpiece which can be applied by the invention is smaller.

Claims

1. A three-nozzle layered collaborative printing method is characterized in that a left nozzle and a right nozzle which are positioned at the same height are arranged, an upper nozzle which is higher than the left nozzle and the right nozzle by a printing layer thickness is arranged between the left nozzle and the right nozzle, a printing platform is arranged below the left nozzle and the right nozzle, and the relative distances between the printing platform and the left nozzle, the right nozzle and the upper nozzle are adjustable, and the three-nozzle layered collaborative printing method comprises the following steps:

b. planning a path of each layer of the workpiece model from bottom to top;

i. and repeating the steps until the whole workpiece is printed.

2. The three-nozzle layered collaborative printing method according to claim 1, wherein after the left and right nozzles complete printing of a certain layer, the upper nozzle waits for the straight line being printed by the upper nozzle to complete, and then the distance H between the printing platform and the left or right nozzle is increased by the thickness of one printing layer.

3. The three-nozzle layered collaborative printing method according to claim 1, wherein the left nozzle and the right nozzle are small-pitch nozzles, the small-pitch nozzles include a horizontal feed pipe, a throat bent downward is provided at an end of the feed pipe, a nozzle opening downward is provided at a lower port of the throat, and the nozzles of the left nozzle and the nozzles of the right nozzle are located inside.

4. The three-nozzle layered collaborative printing method according to claim 3, wherein a heat sink is arranged on the feeding pipe, a fan is arranged on the heat sink, the throat pipe penetrates through a heating block, and a heating rod penetrates through the heating block.

5. A three-nozzle 3D printer for implementing the three-nozzle layered collaborative printing method according to claim 1, it is characterized by comprising a frame, wherein two first X-axis movement mechanisms are arranged on the frame, two first Y-axis motion mechanisms are arranged between the two first X-axis motion mechanisms, a left spray head is arranged on one first Y-axis motion mechanism, a right spray head is arranged on the other first Y-axis movement mechanism, two second X-axis movement mechanisms are arranged above the first X-axis movement mechanism, a second Y-axis movement mechanism is arranged between the two second X-axis movement mechanisms, an upper spray head is arranged on the second Y-axis movement mechanism, the upper sprayer is positioned between the left sprayer and the right sprayer, and the upper sprayer is higher than the left sprayer and the right sprayer by the thickness of one printing layer; the automatic printing machine is characterized in that a vertical lead screw and a vertical feed bar are arranged on the rack, a printing platform is arranged on the lead screw and the feed bar, the lead screw and the feed bar penetrate through the printing platform, a lead screw nut is fixed on the printing platform, the lead screw nut and the lead screw are connected in a screwing manner, and the lead screw is driven by a motor to drive the printing platform to move along the lead screw.

6. The three-nozzle 3D printer according to claim 5, wherein the left nozzle and the right nozzle are small-pitch nozzles, the small-pitch nozzles comprise horizontal feed pipes, a throat bent downwards is arranged at the end of each feed pipe, and a nozzle with a downward opening is arranged at the lower port of each throat.

7. The three-nozzle 3D printer according to claim 6, wherein a heat sink is arranged on the feeding pipe, a fan is arranged on the heat sink, the throat pipe penetrates through a heating block, and a heating rod penetrates through the heating block.

8. The three-nozzle 3D printer according to claim 5, wherein the first X-axis motion mechanism, the second X-axis motion mechanism, the first Y-axis motion mechanism and the second Y-axis motion mechanism comprise horizontal sliding rails, rotating shafts are arranged at two ends of each sliding rail, belts are mounted on the two rotating shafts, a sliding block is arranged on each sliding rail and driven to move by the belts, and a stepping motor is arranged on one rotating shaft and driven to rotate by the stepping motor.