WO2016041449A1

WO2016041449A1 - Fused deposition 3d printer and printing method therefor

Info

Publication number: WO2016041449A1
Application number: PCT/CN2015/089064
Authority: WO
Inventors: 余金文; 凌毅
Original assignee: 余金文; 凌毅
Priority date: 2014-09-15
Filing date: 2015-09-07
Publication date: 2016-03-24
Also published as: CN104260349B; CN104260349A

Abstract

Disclosed is a fused deposition 3D printer, which comprises a housing, a lifting mechanism and a composite extruding mechanism, wherein the lifting mechanism is mounted in the housing, the composite extruding mechanism comprises a machine barrel, a screw rod, and a long fibre delivery pipe, a side wall of the machine barrel is provided with a feed pipe communicating with a material cavity of the machine barrel, the screw rod is mounted in the material cavity in a rotatable manner, the screw rod is provided with a mounting channel which communicates with an upper end and a lower end of the screw rod; the long fibre delivery pipe is inserted in the mounting channel and is provided with a delivery channel for delivering continuous long fibre; and the delivery channel, the mounting channel and the material cavity communicate in sequence. At the same time, further disclosed is a printing method for the fused deposition 3D printer. The present invention synchronously extrudes the continuous long fibre and the printing material wrapping same together onto a working platform, which improves the strength and the surface flatness of the printed product, thereby improving the working efficiency.

Description

Melt stacked 3D printer and printing method thereof

Technical field

The present invention relates to 3D printing technology, and in particular to a fused stacked 3D printer and a printing method thereof.

Background technique

3D printing is a widely used rapid prototyping technology. The forming process principle is: firstly establish a computer 3D model of the target part, and then use the software to layer and slice the 3D model to obtain the data information of each processing level. Under the control of the computer, the laminated additive is manufactured according to the slice level information, and the manufacturing of the target processing is completed. The advantage of 3D printing is that it is not limited by the complexity of the shape of the part. It does not require any tooling molds. It is fast and efficient, and it can realize the automatic manufacturing of free-form entities. It is receiving more and more attention.

The fused stack 3D printer is one of the current 3D printers. Melt-stacked 3D printers are widely used because of the low cost of equipment and the cost of printing materials. However, the melt-stacked 3D printer also has the following technical defects: 1. The product printed by the melt-stacked 3D printer is low in strength, which cannot meet the requirements of engineering applications; 2. The surface of the melt-stacked 3D printer printed product is rough; 3. The applicable printing material The limitations are large.

Summary of the invention

SUMMARY OF THE INVENTION The object of the present invention is to overcome the deficiencies of the prior art described above and to provide a melt-stacked 3D printer which is simple in structure, reasonable in structure, high in strength of printed products, and excellent in surface smoothness of printed products. At the same time, the present invention also provides a printing method of a fused stacked 3D printer.

The object of the present invention is achieved by the following technical solution: the present melt-stacked 3D printer includes a casing and a lifting mechanism, the lifting mechanism is installed in the casing, and further comprises a composite extrusion mechanism, the composite extrusion mechanism comprising a barrel, a screw and a long fiber conveying pipe, the side wall of the barrel is provided with a barrel a feeding tube communicating with the chamber, the screw being rotatably mounted in the chamber, the screw being provided with a mounting passage, the mounting passage communicating with the upper end and the lower end of the screw; the long fiber conveying tube being inserted into the mounting passage The long fiber conveying pipe is provided with a conveying passage for conveying continuous long fibers; the conveying passage, the installation passage and the material chamber are sequentially connected.

A mounting channel is arranged in the screw and a long fiber conveying pipe is arranged in the mounting channel to form a continuous long fiber extrusion system, which can continuously extrude the continuous long fiber and the printing material wrapping the same, thereby improving the strength and surface of the printed product. Smoothness and high processing efficiency.

Preferably, the composite extrusion mechanism further includes a first bracket, a second bracket and a long fiber conveying roller set, the first bracket and the second bracket are mounted on the lifting mechanism from the top to the bottom, and the long fiber conveying roller group Mounted on the first bracket, the upper end of the barrel is mounted on the second bracket, the upper end of the long fiber duct is fixed to the first bracket, and the long fiber duct is located below the long fiber transport roller set, The long fiber delivery tube is connected to the long fiber conveyor roller set. This adds a long fiber conveyor roll set to the continuous long fiber extrusion system, which increases the automation of continuous long fiber transport and ensures stable and reliable transport of continuous filaments.

Preferably, the long fiber conveying roller set comprises a first motor, a driving roller, a driven roller, a driving shaft and a driven shaft, the first motor is mounted on a side of the first bracket, and the driving shaft and the driven shaft are installed in parallel The first shaft is coupled to the first motor, and the driving roller and the driven roller are respectively mounted on the driving shaft and the driven shaft, and the driving roller and the driven roller are oppositely disposed.

Preferably, the inlet of the conveying passage of the long fiber conveying pipe is located directly between the driving roller and the driven roller.

Preferably, the center line of the chamber, the center line of the screw, and the center line of the long fiber delivery tube are on the same line.

Preferably, a working platform and a sliding rail supporting the working platform are disposed under the composite extrusion mechanism.

Preferably, the composite extrusion mechanism further comprises a fiber cutter, a nozzle and a cylinder, the nozzle being mounted on a discharge opening of the barrel, the nozzle being provided with a cutting passage matched with the fiber cutter, the cutting passage and the cutting passage The inner hole of the nozzle is connected, the cylinder is fixed to the lower end surface of the barrel, and the fiber cutter is mounted on a telescopic rod of the cylinder, and the fiber cutter is inserted into the cutting channel.

Preferably, the upper end of the feeding tube is provided with a hopper, the angle between the center line of the feeding tube and the center line of the barrel is 30°-90°; the lower end of the barrel is provided At least 1 outer heating coil, the heating coil being located below the feed tube.

Preferably, a second motor is disposed on a side of the second bracket, and the second motor is coupled to the screw through a transmission mechanism, and the transmission mechanism is a worm gear transmission mechanism.

Preferably, the lifting mechanism comprises a lifting frame, a screw rod and two guiding rods, wherein the two guiding rods are respectively fixed at two ends of the housing, and both ends of the lifting frame are provided with a guide rod passing through a through hole, the screw is installed in the housing, and the lifting frame is sleeved on the screw.

The above printing method of the fused stacked 3D printer includes the following steps:

(1) Establish a three-dimensional model of the target part on the computer, and then use the software to layer and slice the three-dimensional model to obtain the plane data information of each processing level, and convert it into the moving track command of the working platform and the lifting mechanism to drive the composite extrusion. An instruction to move the mechanism up and down;

(2) When starting work, the printing material is added to the feeding hopper, and the printing material enters the cavity of the barrel through the feeding tube, and the printing material is melted in the material cavity, and the printing materials in the molten state are pushed by the screw rotation At the same time, the continuous long fibers enter the conveying path of the long fiber conveying pipe from the long fiber conveying roller group, and the continuous long fibers are impregnated and wrapped by the molten printing material after moving to the outlet of the nozzle after passing through the conveying passage. The continuous long fibers and the printed materials encasing them are simultaneously extruded from the outlet of the nozzle to the corresponding position of the working platform for melt deposition, thereby completing printing.

Specifically, the continuous long fibers used in the printing of the above-mentioned melt-stacked 3D printer may be carbon fiber, glass fiber, aramid fiber, spandex fiber, plant fiber or metal fiber, or may be various types of fibers pre-impregnated with resin. This uses different fibers depending on the product's different needs, which also broadens the use of printed materials.

The present invention has the following advantages over the prior art:

1. The invention provides a screw for installing a channel and a long fiber conveying tube in the installation channel. In the printing process, the continuous long fiber is simultaneously impregnated and wrapped by the printing material, and the continuous fiber and the package are continuous. The printed material wrapped together is extruded to the working platform for melt deposition, and the melt-stacked 3D printer can simultaneously add continuous long fibers during the printing process, and arrange the long fibers in order, which greatly improves the strength of the printed product. This is equivalent to adding ordered steel bars to the concrete to increase the strength of the reinforced concrete. The increase in the strength of the printed product satisfies the requirements of engineering applications.

2. The melt-stacked 3D printer of the present invention can increase the strength of the printed product by adding continuous long fibers at the same time in the printing process, thereby reducing the limitation of the use of the printing material while satisfying the strength of the printed product. .

3. In the printing process, the continuous long fiber is impregnated and wrapped by the molten printing material, which overcomes the surface roughness defect caused by the conventional fiber reinforcement injection molding product or the surface floating fiber of the extruded product, and improves the printing product. quality.

4. In the printing process of the present invention, after continuous long fibers emerge from the conveying passage of the long fiber conveying pipe, and before being extruded, the continuous long fibers are impregnated and wrapped by the molten printing material, and the continuous long fibers are The printed material that wraps it is also extruded at the same time. Compared with the conventional printing process, the continuous extrusion of the continuous long fiber and the printing material improves the printing efficiency.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic view showing the structure of a melt-stacked 3D printer of the present invention.

2 is a front elevational view of a fused stacked 3D printer of the present invention. The housing is stripped.

Figure 3 is a schematic view showing the structure of the composite extrusion mechanism of the present invention.

Figure 4 is an exploded view of the composite extrusion mechanism of the present invention.

Figure 5 is an enlarged schematic view of the portion I in Figure 4.

Figure 6 is a cross-sectional view of the mechanism of the composite extrusion mechanism of the present invention.

Figure 7 is an enlarged schematic view of the portion H in Figure 6. The heating coil is not shown.

Figure 8 is a schematic view showing the structure of the screw of the present invention.

Figure 9 is a schematic view showing the structure of the barrel of the present invention. The connection between the feed tube and the barrel is shown in this figure.

detailed description

The invention will now be further described with reference to the accompanying drawings and embodiments.

The melt-stacked 3D printer shown in FIGS. 1 to 9 includes a housing 1 and a lifting mechanism 2, the lifting mechanism 2 is mounted in the housing 1, and further includes a composite extrusion mechanism 3, and the composite extrusion mechanism 3 The barrel 301, the screw 302 and the long fiber conveying pipe 303 are included. The side wall of the barrel 301 is provided with a feeding pipe 304 communicating with the cavity 3011 of the barrel 301, and the screw 302 is rotatably mounted to the cavity. In the 3011, the screw 302 is provided with a mounting passage 3021 that communicates with the upper end and the lower end of the screw 302; the long fiber delivery tube 303 is inserted into the mounting channel 3021, and the long fiber delivery tube 303 is provided for A conveying passage 3031 conveying the continuous long fibers 4; the conveying passage 3031, the mounting passage 3021 and the cavum 3011 are sequentially connected.

As shown in FIGS. 8 and 9, the mounting passage 3021 is added to the screw 302, and the mounting passage 3021 is located in the middle of the screw 302, that is, the center line of the mounting passage 3021 coincides with the center line of the screw 302. At the same time, the mounting channel 3021 is relatively matched to the outer shape of the long fiber delivery tube 303, which allows the long fiber delivery tube 303 to be better mounted in the mounting channel 3021. In the present embodiment, the mounting channel 3021 has a circular cross section. During the printing process, only the screw 302 is driven to rotate by the second motor 6, and the barrel 301 and the long fiber delivery tube 303 are stationary with respect to the screw. During the rotation of the screw 302, the rotating screw 302 shears and squeezes the printing material, so that the printing material is uniformly and stably extruded to the nozzle 309; at the same time, the continuous long fiber 4 is subjected to the long fiber conveying roller. The action of the group 307, the continuous long fiber 4 first enters from the upper end of the conveying passage 3031 of the long fiber conveying pipe 303, and then protrudes from the lower end of the conveying passage 3031, and the continuous long fiber 4 moves from the lower end of the conveying passage 3031 to the inner hole of the nozzle 309. In the process of exiting 3092, the molten printing material is impregnated and wrapped, and then the printing material is pressed downward by the screw 302, and the continuous long fibers 4 continue to be moved downward by the long-fiber conveying roller set 307, thereby continuously growing the fibers 4 Together with the wrapped print material, it is extruded from the outlet of the inner bore of the nozzle 309. In order for the printed material to be better extruded, the bottom of the lower end of the chamber 3011 is inverted.

As shown in FIG. 3, FIG. 4 and FIG. 6, the composite extrusion mechanism further includes a first bracket 305, a second bracket 306 and a long fiber transport roller set 307, and the first bracket 305 and the second bracket 306 are from the top. And mounted on the lifting mechanism 2, the long fiber conveying roller set 307 is mounted on the first bracket 305, the barrel The upper end of the 301 is mounted on the second bracket 306, the upper end of the long fiber conveying pipe 303 is fixed to the first bracket 305, and the long fiber conveying pipe 303 is located below the long fiber conveying roller group 307, the long fiber conveying pipe 303 is connected to the long fiber conveying roller set 307. The first bracket 305 and the second bracket 306 are similar in structure. The first bracket 305 and the second bracket 306 are arranged in parallel above and below. The upper end of the long fiber transport tube 303 is fixed to the bottom plate of the first bracket 305; the upper end of the barrel 301 is fixed at the upper end. Two brackets 306. The screw 302 is inserted into the cavity 3011 of the barrel 301, and the upper end of the screw 302 is connected to the upper end of the chamber 3011 through the bearing 5, which causes the screw 302 to rotate without the barrel 301. The screw 302 is driven by a second motor 6 located on the side of the second bracket 305, and the second motor 6 is coupled to the screw 302 by a worm gear mechanism. As shown in FIGS. 3 and 6, the worm wheel 7 is sleeved at the upper end of the screw 302, and one end of the worm 8 is connected to the output shaft of the second motor 6, and the other end of the worm 8 is connected to the worm wheel 7.

As shown in FIG. 3, FIG. 4 and FIG. 6, the long fiber conveying roller set 307 includes a first motor 3071, a driving roller 3072, a driven roller 3073, a driving shaft 3074, and a driven shaft 3075. The first motor 3071 is mounted on The side of the first bracket 305, the driving shaft 3074 and the driven shaft 3075 are mounted in parallel on the first bracket 305, and the driving shaft 3074 is connected to the first motor 3071 through a gear transmission mechanism 14, the driving roller 3072 and The driven rollers 3073 are respectively mounted to the driving shaft 3074 and the driven shaft 3075, and the driving roller 3072 and the driven roller 3073 are opposed to each other. The long fiber transport roller set 307 is used for the transport of continuous long fibers, wherein the continuous long fibers are conveyed mainly by the engagement of the drive roller 3072 and the driven roller 3073. The driving roller 3072 and the driven roller 3073 are sleeved with a sleeve made of a soft material, and the sleeve of the driving roller 3072 is attached to the roller sleeve of the driven roller 3073, which ensures the friction between the continuous long fiber 4 and the sleeve. , the continuous filament 4 is effectively and stably moved under the frictional force.

As shown in FIG. 6, the inlet of the conveying passage 3031 of the long fiber conveying pipe 303 is located directly between the driving roller 3072 and the driven roller 3073. With this design, this ensures that the continuous long fibers 4 are accurately entered into the conveying passage 3031 from between the driving roller 3072 and the driven roller 3073.

The center line of the cavities 3011, the center line of the screw 302, and the center line of the long fiber delivery tube 303 are on the same straight line. With this design, the molten printed material can evenly wrap the continuous long fibers 4, further improving the quality of the printed product.

As shown in FIGS. 1 and 2, a working platform 9 and a slide rail 10 supporting the work platform 9 are provided below the composite extrusion mechanism 3. The slide rail 10 includes a slide rail A1001 and a slide rail B1002 which are perpendicular to each other. The work platform 9 is slidably mounted on the slide rail A1001, and the slide rail A1001 is slidably mounted on the slide rail B1002. With this design, the work platform 9 can move in the X-axis direction and in the Y-axis direction through the two slide rails in the horizontal direction. The composite extrusion mechanism 3 can be moved up and down by the lifting mechanism 2 to complete 3D printing.

As shown in FIG. 6 and FIG. 7, the composite extrusion mechanism 3 further includes a fiber cutter 308, a nozzle 309 and a cylinder 310. The nozzle 309 is mounted on a discharge port of the barrel 301, and the nozzle 309 is provided with The fiber cutter 308 is matched with a cutting passage 3091 that communicates with the inner hole 3092 of the nozzle 309. The cylinder 310 is fixed to the lower end surface of the barrel 301, and the fiber cutter 308 is attached to the telescopic rod of the cylinder 310. And the fiber cutter 308 is inserted into the cutting channel 3091. The fiber cutter 308 is moved by the cylinder 310, and the continuous long fibers are cut using the fiber cutter 308. As shown in FIG. 5, a middle portion of the fiber cutter 308 is provided with a shear hole 3081 corresponding to the inner hole 3092 of the nozzle 309. When the cylinder 310 is extended, the shear hole 3081 is displaced from the inner hole 3092 of the nozzle 309, thereby cutting the continuous filament 4.

As shown in FIGS. 1 to 4, 6, and 9, the upper end of the feed pipe 304 is provided with a hopper 11, an angle between a center line of the feed pipe 304 and a center line of the barrel 301. The size is 60°; the lower end of the barrel 301 is provided with at least one outer heating ring 12, and the heating ring 12 is located below the feeding tube 304. The feed tube 304 is designed to be inclined, which ensures that the printed material is stably and reliably fed into the chamber 3011 from the feed tube 304. During the printing process, the activation of the heating coil 12 is determined according to the printing material. If the printing material is a non-thermofusible material such as a viscous liquid thermosetting material or a viscous liquid photocurable material, the heating coil 12 does not need to be activated. Rotation of the screw 302 squeezes the liquid printed material toward the nozzle 309.

As shown in FIG. 1 and FIG. 2, the lifting mechanism 2 includes a lifting frame 201, a screw rod 202 and two guiding rods 203, and the two guiding rods 203 are respectively fixed at two ends of the housing 1, and the lifting and lowering Both ends of the frame 201 are provided with through holes through which the guide rods 203 are passed. The screw rods 202 are mounted in the housing 1 , and the lifting frame 201 is sleeved on the screw rods 202 . The guide rod 203 is used for guiding and ensuring that the lifting frame 201 is stable mobile. Specifically, the first bracket 305 and the second bracket 306 are mounted in parallel to the lifting frame 201 from top to bottom. With this design, the structure is simple and the installation is convenient.

(2) At the beginning of the work, the printing material is added to the hopper 11, and the printing material enters the cavity 3011 of the barrel 301 through the feeding tube 304, and the printing material is melted in the cavity 3011, and the printed materials in the molten state are The screw rotary extrusion is pushed to the nozzle 309; at the same time, the continuous long fibers enter the conveying passage 3031 of the long fiber conveying pipe 303 from the long fiber conveying roller group 307, and the continuous long fibers pass through the conveying passage 3031 and move to the outlet of the nozzle. During the process, the molten printing material is impregnated and wrapped, and the continuous long fibers and the printing material enclosing the same are simultaneously extruded from the outlet of the nozzle 309 to the corresponding position of the working platform 9 to be melt-stacked, thereby completing printing.

Specifically, when printing using the melt-stacked 3D printer, the printing process is:

A. Firstly, a three-dimensional model of the target part is built on the computer, and then the three-dimensional model is layered and sliced by software, and the plane data information of each processing level is obtained, and converted into a moving track command of the working platform and a lifting mechanism to drive the composite extrusion. An instruction to move the mechanism up and down;

B. Printing the first slice plane layer at the bottom: the composite extrusion mechanism 3 and the work platform 9 are in an initial position; when starting work, the printing material is added to the hopper 11, and the printing material enters the cavity of the barrel 301 through the feeding tube 304. 3011, the screw 302 rotates to cut and squeeze the printing material in the cavity 3011, the printing material becomes molten in the cavity 3011, and the screw 302 rotates to squeeze the molten printing material toward the nozzle 309; Under the action of the driving roller 3072 and the driven roller 3073, the continuous long fibers enter the conveying passage 3031 of the long fiber conveying pipe 303. After the continuous long fibers pass through the conveying passage 3031, the inlet of the conveying passage 3031 and the inlet of the nozzle 309 are bored. Between the continuous filaments and the molten printing material, the continuous filaments are impregnated and wrapped by the molten printing material, and then the continuous filaments and the printed material encasing them are extruded from the nozzle 309; the fiber cutter 308 is according to the After the completion of each printing track, the continuous long fibers are cut, and the printing material encapsulating the continuous long fibers is melted and accumulated on the working platform 9 to form a first slice plane layer;

C. Printing the second slice plane layer: by driving the screw rod 202, the lifting frame 201 drives the composite extrusion mechanism to rise by one working unit height, repeating feeding, printing material screw rotary extrusion, continuous long fiber conveying, fiber cutting process , complete the printing of the second slice plane layer;

D. Printing the third to last slice plane layer: repeating step C, printing the third to last slice plane, completing the laminate manufacturing of the target part, that is, completing the molten deposition 3D printing manufacturing of the target part.

The above-mentioned embodiments are preferred embodiments of the present invention, and the present invention is not limited thereto, and any other modifications or other equivalent substitutions that do not depart from the technical solutions of the present invention are included in the scope of the present invention. within.

Claims

A melt-stacked 3D printer comprising a housing and a lifting mechanism, the lifting mechanism being mounted in the housing, characterized by further comprising a composite extrusion mechanism comprising a barrel, a screw and a long fiber conveying tube The side wall of the barrel is provided with a feeding tube communicating with the material chamber of the barrel, the screw is rotatably installed in the material chamber, the screw is provided with a mounting passage, and the mounting passage communicates with the upper end of the screw And a lower end; the long fiber delivery tube is inserted into the installation channel, and the long fiber delivery tube is provided with a conveying passage for conveying continuous long fibers; the conveying passage, the installation passage and the material chamber are sequentially connected.
The fused deposition 3D printer of claim 1 wherein said composite extrusion mechanism further comprises a first support, a second support, and a long fiber transport roller set, said first support and said second support from above Mounted on the lifting mechanism, the long fiber conveying roller set is mounted on the first bracket, the upper end of the barrel is mounted on the second bracket, the upper end of the long fiber conveying tube is fixed to the first bracket, and the long fiber is The conveying pipe is located below the long fiber conveying roller set, and the long fiber conveying pipe is connected to the long fiber conveying roller set.
The fused-package 3D printer according to claim 2, wherein the long-fiber conveying roller set comprises a first motor, a driving roller, a driven roller, a driving shaft and a driven shaft, and the first motor is mounted on the first bracket a side surface, the driving shaft and the driven shaft are mounted in parallel on the first bracket, and the driving shaft is coupled to the first motor, and the driving roller and the driven roller are respectively mounted on the driving shaft and the driven shaft, and The driving roller and the driven roller are oppositely disposed.
The fused-package 3D printer according to claim 3, wherein the inlet of the conveying path of the long-fiber conveying pipe is located directly between the driving roller and the driven roller.
The fused-package 3D printer of claim 1 wherein the centerline of the chamber, the centerline of the screw, and the centerline of the long fiber delivery tube are on the same line.
The fused stacked 3D printer of claim 1 wherein a working platform and a slide rail supporting the work platform are disposed below the composite extrusion mechanism.
The fused stacked 3D printer of claim 1 wherein: said composite The extrusion mechanism further includes a fiber cutter, a nozzle and a cylinder, the nozzle being mounted to a discharge port of the barrel, the nozzle being provided with a cutting passage matched with the fiber cutter, the cutting passage being in communication with the inner hole of the nozzle, The cylinder is fixed to a lower end surface of the barrel, the fiber cutter is mounted to a telescopic rod of the cylinder, and the fiber cutter is inserted into the cutting passage.
The fused stack 3D printer according to claim 1, wherein the upper end of the feed pipe is provided with a hopper, and the angle between the center line of the feed pipe and the center line of the barrel is 30. °～90°; the lower end of the barrel is provided with at least one outer heating ring, and the heating ring is located below the feeding tube.
The fused stack 3D printer according to claim 2, wherein a second motor is disposed on a side of the second bracket, and the second motor is coupled to the screw through a transmission mechanism, and the transmission mechanism is a worm gear transmission mechanism.
The fused stack 3D printer according to claim 1, wherein the lifting mechanism comprises a lifting frame, a screw rod and two guiding rods, and the two guiding rods are respectively fixed at two ends of the housing, the lifting Both ends of the frame are provided with through holes through which the guide rods are passed, and the screw rods are installed in the casing, and the lifting frame is sleeved on the screw rods.
The printing method of the fused-package 3D printer according to any one of claims 1 to 10, comprising the steps of:

(1) Establish a three-dimensional model of the target part on the computer, and then use the software to layer and slice the three-dimensional model to obtain the plane data information of each processing level, and convert it into the moving track command of the working platform and the lifting mechanism to drive the composite extrusion. An instruction to move the mechanism up and down;

(2) When starting work, the printing material is added to the feeding hopper, and the printing material enters the cavity of the barrel through the feeding tube, and the printing material is melted in the material cavity, and the printing materials in the molten state are pushed by the screw rotation At the same time, the continuous long fibers enter the conveying path of the long fiber conveying pipe from the long fiber conveying roller group, and the continuous long fibers are impregnated and wrapped by the molten printing material after moving to the outlet of the nozzle after passing through the conveying passage. The continuous long fibers and the printed materials encasing them are simultaneously extruded from the outlet of the nozzle to the corresponding position of the working platform for melt deposition, thereby completing printing.