CN115195119A

CN115195119A - 3D printer

Info

Publication number: CN115195119A
Application number: CN202210734124.7A
Authority: CN
Inventors: 杨德安
Original assignee: Xiamen Smart Industrial Design Co ltd
Current assignee: Xiamen Smart Industrial Design Co ltd
Priority date: 2022-06-27
Filing date: 2022-06-27
Publication date: 2022-10-18

Abstract

The invention relates to the technical field of 3D printers, in particular to a 3D printer. The device comprises a machine body, wherein a printing platform is connected to one side wall of the machine body in a sliding manner along the vertical direction, an extrusion head is arranged right above the printing platform, a feeding unit is arranged in the machine body, and the bottom of the feeding unit is communicated with a hot melting unit; the hot melting unit comprises a hot melting cylinder; the hot melt section of thick bamboo top intercommunication has the feed head, feed head top intercommunication is in the pay-off unit bottom, be provided with first inner tube in the hot melt section of thick bamboo, be equipped with the second inner tube in the first inner tube, the axis of first inner tube, second inner tube and hot melt section of thick bamboo all coincides, hot melt section of thick bamboo inner wall and first inner tube outer wall, and all be equipped with the clearance between first inner tube inner wall and the second inner tube outer wall. The hot melting device improves the hot melting efficiency while improving the smoothness of conveying the raw material wires.

Description

3D printer

Technical Field

The invention belongs to the technical field of 3D printers, and particularly relates to a 3D printer.

Background

The raw materials used by the 3D printer generally include metal powder and engineering plastics, and among them, the engineering plastics are widely used due to their mature technology and low price.

When the engineering plastic is used, the solid raw material wires are generally conveyed into the hot melting unit to be heated, so that the raw material wires become viscous liquid, and then the viscous liquid is extruded to the printing platform by the extrusion head. The existing hot melting unit generally heats a single cavity and then carries out hot melting on the raw material section through heat energy in the cavity. This causes heat energy to gradually act on the raw material wire from outside to inside, resulting in a slow heat-melting speed and a low heat-melting efficiency.

Disclosure of Invention

Aiming at the problems, the invention provides a 3D printer which comprises a machine body, wherein a printing platform is connected to one side wall of the machine body in a sliding mode along the vertical direction, an extrusion head is arranged right above the printing platform, a feeding unit is arranged in the machine body, and the bottom of the feeding unit is communicated with a hot melting unit;

the hot melting unit comprises a hot melting cylinder; the top of the hot melting cylinder is communicated with a feeding head, the top of the feeding head is communicated with the bottom of the feeding unit, a first inner cylinder is arranged in the hot melting cylinder, a second inner cylinder is arranged in the first inner cylinder, the central axes of the first inner cylinder, the second inner cylinder and the hot melting cylinder are coincided, and gaps are formed between the inner wall of the hot melting cylinder and the outer wall of the first inner cylinder and between the inner wall of the first inner cylinder and the outer wall of the second inner cylinder; a plurality of groups of grinding blocks are evenly distributed on the inner and outer walls of the first inner cylinder and the second inner cylinder and the inner wall of the hot melting cylinder, and the tops of the grinding blocks are provided with inclined planes; a hot-melting air inlet is formed in the outer wall of the hot-melting cylinder, and one end of the hot-melting air inlet is communicated with a heat transfer rod; the other end of the heat transfer rod sequentially penetrates through the first inner cylinder and the second inner cylinder and is fixedly connected with the inner walls of the first inner cylinder and the second inner cylinder; the bottom of the hot melting cylinder is communicated with a discharging head, and the other end of the discharging head is communicated with the output end of the extrusion head.

Furthermore, a double-shaft electric sliding table is arranged right above the printing platform, and the extrusion head is connected to the output end of the double-circumference electric sliding table in a sliding manner; a servo motor is installed on one side wall of the machine body, which is far away from the base, the output end of the servo motor is in transmission connection with a bevel gear, and the other end of the bevel gear is in transmission connection with a power input part of the feeding unit.

Furthermore, a hot melting heating device is arranged in the machine body, and the output end of the hot melting heating device is communicated with the feeding unit and the hot melting unit.

Further, the feeding unit comprises a preheating mechanism; preheating mechanism includes a preheating section of thick bamboo, a preheating section of thick bamboo is installed at the organism top, just preheat the bobbin base portion and extend to the organism, first passageway has been seted up to preheating section of thick bamboo center department, set up passageway inner wall chamber in the inner wall of first passageway, set up on the lateral wall that first passageway was kept away from in passageway inner wall chamber and preheated the air inlet, preheat the air inlet other end and pass through pipeline and hot melt heating equipment intercommunication.

Furthermore, preheating ports are evenly distributed on one side wall of the inner wall cavity of the channel, which is close to the first channel, and the other end of each preheating port is communicated with the first channel; the inner diameter of one end of the preheating opening, which is close to the first channel, is smaller than that of the other end of the preheating opening; the bottom of the preheating cylinder is rotatably connected with a first sealing bearing, and the bottom of the first sealing bearing is rotatably connected with a spiral wire feeding mechanism.

Further, the spiral wire feeding mechanism comprises a wire feeding barrel, a second channel is formed in the center of the wire feeding barrel, and the top of the second channel is communicated with the first channel through a first sealing bearing; spiral raised lines are spirally arranged on the inner wall of the second channel, and a plurality of groups of anti-skid lugs are arranged on the spiral raised lines at equal intervals.

Further, a bevel gear is sleeved on the outer wall of the wire feeding cylinder and is in meshed connection with the bevel gear; and the bottom of the wire feeding cylinder is rotatably connected with a second sealing bearing.

Furthermore, a plurality of groups of cutting blades are arranged in the feeding head at equal intervals, the blade points of the cutting blades are positioned at the top of the feeding head, and a plurality of groups of auxiliary cutting blades are arranged on two side walls of the cutting blades at equal intervals.

Further, the printing platform comprises a platform body; the platform body is connected to one side wall of the machine body close to the extrusion head in a sliding mode along the vertical direction, and the platform body is located under the extrusion head; the hot air blower is fixedly arranged in the platform body, a heat conducting plate is arranged on the hot air blower, and the other side wall of the heat conducting plate is attached to the inner wall of the top of the platform body; a group of side plates are arranged at the edges of the top of the periphery of the platform body, and a plurality of groups of side plates are sequentially connected end to end; the inner cavity of the side plate is communicated with the output end of the air heater through a pipeline.

Furthermore, a plurality of groups of first air outlets are arranged on one side wall of the side plate close to the center line of the platform body at equal intervals along the horizontal direction; the heights of the two ends of the first air outlet are the same; a plurality of groups of second air outlets are arranged right above each group of first air outlets at equal intervals along the vertical direction; one end of the second air outlet close to the inner cavity of the side plate is lower than the other end of the second air outlet; and a plurality of groups of third air outlets are arranged under each group of the first air outlets at equal intervals along the vertical direction, and one end of each third air outlet, which is close to the inner cavity of the side plate, is higher than the other end of each third air outlet.

The beneficial effects of the invention are:

1. firstly, a plurality of groups of material cutting blades which are arranged at equal intervals are utilized to cut the preheated raw material wire into a plurality of particles. And then, the granular raw material wires are heated in a layering way by utilizing the hot melting cylinder, the first inner cylinder and the second inner cylinder to be melted into viscous liquid. The contact area of the raw material wire rods and the hot melting mechanism is increased, the raw material wire rods are heated more uniformly, the situation that the joint of the feeding unit and the hot melting unit is blocked due to too slow heating of the raw material wire rods is avoided, and the heating speed of the raw material wire rods is increased. The hot melting efficiency is improved while the conveying smoothness of the raw material wires is improved.

2. A plurality of groups of auxiliary cutting blades are distributed on the two side walls of the cutting blade at equal intervals, and the cutting direction of the auxiliary cutting blades is vertical to that of the cutting blade. After the raw material wire is cut by the cutting blade, the fragments slide from two sides and contact with the auxiliary cutting blade, and secondary cutting is carried out from different angles, so that the volume of raw material wire particles is further reduced. Not only is the efficiency of follow-up hot melting work improved, but also the cutting quality of raw material wires is promoted, and the raw material wires are prevented from being blocked in gaps between two adjacent groups of material cutting blades due to incomplete cutting.

3. The bevel gear drives the bevel gear to rotate, the bevel gear drives the wire feeding barrel to rotate, and the spiral raised lines are spirally distributed on the inner wall of the second channel, so that when the wire feeding barrel rotates, a plurality of groups of anti-skidding lugs arranged on the spiral raised lines at equal intervals can be utilized to simultaneously drive the raw material wire rods to move downwards from all directions. Not only make raw materials wire rod surface atress more even, the problem that the delivery direction that both sides set up the transfer roller in the past brought appears the deviation can not appear. Meanwhile, the friction force and the stress direction between the raw material wire and the surface of the raw material wire are increased, the conventional slipping condition is avoided, and the smoothness of the conveying work of the raw material wire is improved.

4. The hot air is generated through the work of the air heater, and then the 3D model is heated and baked simultaneously from the bottom and the periphery through the heat conduction plate, the first air outlet, the second air outlet and the third air outlet, so that the curing function is realized. And the height of one end of the second air outlet above the first air outlet, which is close to the center of the platform body, is higher than that of the other end of the second air outlet, and the height of one end of the third air outlet below the first air outlet, which is close to the center of the platform body, is lower than that of the other end of the third air outlet, so that the hot air is blown to the surface of the model D in a radial mode. The contact area between the hot air and the D model is increased, and the curing effect is improved while the fixing function is realized.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

Fig. 1 shows a schematic structural diagram of a 3D printer according to an embodiment of the invention;

FIG. 2 shows a schematic right-view cross-sectional view of a 3D printer according to an embodiment of the invention;

FIG. 3 shows a schematic structural view of a feed unit according to an embodiment of the invention;

FIG. 4 shows a schematic cross-sectional view of a preheat mechanism according to an embodiment of the invention;

FIG. 5 shows a schematic cross-sectional view of a screw feed mechanism according to an embodiment of the invention;

FIG. 6 shows a schematic cross-sectional view of a fuse unit according to an embodiment of the invention;

FIG. 7 shows a schematic view of a connection of a hot melt cartridge, a first inner barrel and a second inner barrel according to an embodiment of the invention;

FIG. 8 shows a schematic structural view of a blanking blade according to an embodiment of the invention;

FIG. 9 shows a schematic diagram of a printing platform according to an embodiment of the invention;

FIG. 10 shows a schematic cross-sectional view of a printing platform according to an embodiment of the invention.

In the figure: 100. a body; 110. a base; 120. a platform lifting mechanism; 130. a hot-melt heating device; 140. a servo motor; 150. a bevel gear; 200. a dual-axis electric sliding table; 300. an extrusion head; 400. a feeding unit; 410. a preheating mechanism; 411. a preheating cylinder; 412. a first channel; 413. a channel inner wall cavity; 414. preheating a port; 415. preheating an air inlet; 420. a spiral wire feeding mechanism; 421. a wire feeding cylinder; 422. a second channel; 423. a spiral rib; 424. an anti-slip bump; 430. a first sealed bearing; 440. a helical gear; 450. a second sealed bearing; 500. a heat-melting unit; 510. a hot-melt cylinder; 511. a hot-melt air inlet; 512. a heat transfer rod; 520. a feed head; 530. a cutting blade; 531. auxiliary cutting blades; 540. a first inner cylinder; 550. a second inner barrel; 560. grinding blocks; 570. discharging a stub bar; 600. a printing platform; 610. a platform body; 620. a hot air blower; 630. a heat conducting plate; 640. a side plate; 650. a first air outlet; 660. a second air outlet; 670. and a third air outlet.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment of the invention provides a 3D printer which comprises a machine body 100. Illustratively, as shown in fig. 1 and fig. 2, a base 110 is fixedly mounted at a bottom edge of a side wall of the machine body 100, and a circuit control system is disposed in the base 110.

Be equipped with the electronic slip table 200 of biax directly over base 110, install on the output of the electronic slip table 200 of biax and extrude head 300.

The feeding unit 400 is installed at the top of the machine body 100, the bottom of the feeding unit 400 extends into the machine body 100 and is communicated with the hot melting unit 500, and the output end of the hot melting unit 500 is communicated with the extrusion head 300. The feeding unit 400 is used for continuously feeding the raw material wires into the hot melting unit 500, and the hot melting unit 500 is used for hot melting the solid raw material wires into viscous liquid at a high temperature.

A servo motor 140 is installed on a side wall of the machine body 100 away from the base 110, an output end of the servo motor 140 is connected with a bevel gear 150 in a transmission manner, and the other end of the bevel gear 150 is connected with a power input part of the feeding unit 400 in a transmission manner.

A hot-melting heating device 130 is arranged in the machine body 100, and the output end of the hot-melting heating device 130 is communicated with both the feeding unit 400 and the hot-melting unit 500. The heat fusing heating apparatus 130 is used to provide heat energy for preheating and heat fusing of the raw material wire.

The machine body 100 is provided with a platform lifting mechanism 120 along the vertical direction on a side wall close to the base 110, the output end of the platform lifting mechanism 120 is provided with a printing platform 600, and the printing platform 600 is positioned between the base 110 and the extrusion head 300.

The feed unit 400 includes a preheating mechanism 410. Illustratively, as shown in fig. 3, 4 and 5, the preheating mechanism 410 includes a preheating cylinder 411, the preheating cylinder 411 is installed at the top of the machine body 100, the bottom of the preheating cylinder 411 extends to the machine body 100, a first channel 412 is opened at the center of the preheating cylinder 411, a channel inner wall cavity 413 is opened in an inner wall of the first channel 412, a preheating inlet 415 is opened on a side wall of the channel inner wall cavity 413 far from the first channel 412, and the other end of the preheating inlet 415 is communicated with the hot-melt heating device 130 through a pipeline. The inner wall cavity 413 of the channel is evenly distributed with preheating ports 414 on one side wall near the first channel 412, and the other end of the preheating port 414 is communicated with the first channel 412. The preheat port 414 has a smaller inside diameter near one end of the first passage 412 than at the other end. The bottom of the preheating cylinder 411 is rotatably connected with a first sealing bearing 430, and the bottom of the first sealing bearing 430 is rotatably connected with a spiral wire feeding mechanism 420.

Illustratively, the spiral wire feeding mechanism 420 comprises a wire feeding cylinder 421, a second channel 422 is opened at the center of the wire feeding cylinder 421, and the top of the second channel 422 is communicated with the first channel 412 through a first sealing bearing 430. Spiral convex strips 423 are spirally arranged on the inner wall of the second channel 422, and a plurality of groups of anti-skid lugs 424 are arranged on the spiral convex strips 423 at equal intervals. The outer wall of the wire feeding cylinder 421 is sleeved with a bevel gear 440, and the bevel gear 440 is in meshed connection with the bevel gear 150. The bottom of the wire feeding cylinder 421 is rotatably connected with a second sealing bearing 450.

One end of the raw material wire is inserted into the first channel 412 and sequentially penetrates through the first sealing bearing 430 and the second channel 422, so that each group of anti-skid lugs 424 can be attached to the raw material wire from all directions. The hot melt heating device 130 is then activated, by means of which hot air is fed into the hot melt unit 500 cavity and the tunnel inner wall cavity 413, raising the temperature in the hot melt unit 500 cavity to between 400-450 ℃ and in the tunnel inner wall cavity 413 to between 70-110 ℃. Then, the servo motor 140 is started, the bevel gear 150 is driven to rotate by the servo motor 140, and the wire feeding cylinder 421 is driven to rotate by the meshing connection relationship between the bevel gear 150 and the bevel gear 440. Because the spiral convex strips 423 are spirally distributed on the inner wall of the second channel 422, when the wire feeding cylinder 421 rotates, the raw material wires are driven to move downwards by the anti-slip bumps 424, so that the purpose of feeding is achieved.

Drive helical gear 440 through bevel gear 150 and rotate, drive by helical gear 440 again and send a line section of thick bamboo 421 to rotate, because spiral convex strip 423 is the heliciform and distributes on second passageway 422 inner wall, consequently when sending a line section of thick bamboo 421 to rotate, can utilize equidistant a plurality of sets of skid proof convex block 424 on spiral convex strip 423 to drive the raw materials wire rod downstream from each position simultaneously. Not only make raw materials wire rod surface atress more even, the problem that the delivery direction that both sides set up the transfer roller in the past brought appears the deviation can not appear. Meanwhile, the friction force and the stress direction between the raw material wire rod and the surface of the raw material wire rod are increased, the conventional slipping condition is avoided, and the smoothness of the conveying work of the raw material wire rod is improved.

After entering the channel inner wall cavity 413, the hot gas enters the first channel 412 through a plurality of groups of preheating ports 414 evenly distributed on the inner wall of the first channel 412, and then acts on the raw wire. And because the inner diameter of the preheating port 414 near one end of the first passage 412 is smaller than that at the other end, when hot gas passes through the preheating port 414, the pressure is increased, the flow rate is increased, and the contact force with the raw material wire rod is enhanced, so that the preheating effect of the raw material wire rod is improved.

The fuse unit 500 includes a fuse cylinder 510. For example, as shown in fig. 6, 7 and 8, a feed head 520 is communicated with the top of the hot melt cylinder 510, a central axis of the feed head 520 is coincident with a central axis of the hot melt cylinder 510, and the top of the feed head 520 is rotatably connected to the bottom of the second seal bearing 450. And the feed head 520 is in communication with the second channel 422 through a second sealed bearing 450. A plurality of groups of cutting blades 530 are arranged in the feeding head 520 at equal intervals, the cutting edge of the cutting blade 530 is located at the top of the feeding head, and a plurality of groups of auxiliary cutting blades 531 are arranged on the two side walls of the cutting blade 530 at equal intervals. A first inner cylinder 540 is arranged in the hot melting cylinder 510, the central axis of the first inner cylinder 540 is superposed with the central axis of the hot melting cylinder 510, and a gap is formed between the outer wall of the first inner cylinder 540 and the inner wall of the hot melting cylinder 510. The first inner cylinder 540 is provided with a second inner cylinder 550, the central axis of the second inner cylinder 550 is superposed with the central axis of the first inner cylinder 540, and a gap is arranged between the outer wall of the second inner cylinder 550 and the inner wall of the first inner cylinder 540. The inner and outer walls of the first inner cylinder 540 and the second inner cylinder 550, and the inner wall of the hot-melt cylinder 510 are evenly distributed with a plurality of groups of polishing blocks 560, and the tops of the polishing blocks 560 are provided with inclined planes. The outer wall of the hot melting cylinder 510 is provided with a hot melting air inlet 511, one end of the hot melting air inlet 511 is communicated with the hot melting heating equipment 130 through a pipeline, and the other end of the hot melting air inlet 511 is communicated with a heat transfer rod 512. The other end of the heat transfer rod 512 sequentially penetrates through the first inner cylinder 540 and the second inner cylinder 550, and is fixedly connected with the inner walls of the first inner cylinder 540 and the second inner cylinder 550. The heat transfer rod 512 is made of copper, but not limited thereto. The bottom of the hot melting cylinder 510 is communicated with a material outlet head 570, and the other end of the material outlet head 570 is communicated with the input end of the extrusion head 300.

Preferably, the heat-melting unit 500 further includes, but is not limited to, a third inner cylinder and a fourth inner cylinder, the third inner cylinder is located in the second inner cylinder 550, a central axis of the third inner cylinder coincides with a central axis of the second inner cylinder 550, and a gap is formed between an outer wall of the third inner cylinder and an inner wall of the second inner cylinder 550. The fourth inner cylinder is positioned in the third inner cylinder, and the central axis of the fourth inner cylinder is superposed with the central axis of the third inner cylinder. And a gap is formed between the outer wall of the fourth inner cylinder and the inner wall of the third inner cylinder.

The preheated raw material wire is conveyed into the feeding head 520 through the spiral wire feeding mechanism 420, and because the continuity of the conveying work of the spiral wire feeding mechanism 420 and the preheated raw material wire are softened, the raw material wire is cut into a plurality of particles after contacting with each group of the cutting blades 530. Then falls down under the action of gravity and randomly falls into the gaps between the hot melting cylinder 510 and the first inner cylinder 540, between the first inner cylinder 540 and the second inner cylinder 550 or into the cavity of the second inner cylinder 550, and the heat energy is uniformly transferred to the inner wall of the hot melting cylinder 510 and the first inner cylinder 540 and the second inner cylinder 550 by using the heat transfer rod 512. The purpose of hot melting can be achieved no matter where the granular raw material wire falls.

First, the preheated raw wire is cut into a plurality of particles by a plurality of groups of cutting blades 530 arranged at equal intervals. Then, the hot melting cylinder 510, the first inner cylinder 540 and the second inner cylinder 550 are used for heating the granular raw material wires in a layered manner, so that the raw material wires are hot melted into viscous liquid. The contact area between the raw material wire rods and the hot melting mechanism is increased, so that the raw material wire rods are heated more uniformly, the blockage at the joint of the feeding unit 400 and the hot melting unit 500 caused by too slow heating of the raw material wire rods is avoided, and the heating speed of the raw material wire rods is also increased. The hot melting efficiency is improved while the conveying smoothness of the raw material wires is improved.

A plurality of sets of auxiliary cutting blades 531 are equally spaced on both side walls of the blanking blade 530, and the cutting direction of the auxiliary cutting blades 531 is perpendicular to the cutting direction of the blanking blade 530. After the raw material wire is cut by the cutting blade 530, the chips slide down from both sides and contact the auxiliary cutting blade 531, and secondary cutting is performed from different angles, further reducing the volume of the raw material wire particles. Not only the efficiency of follow-up hot melt work has been improved, has also promoted the cutting quality of raw materials wire rod, avoids the raw materials wire rod to block up in the gap between two sets of adjacent blank blades 530 because of the cutting is not thorough.

The printing platform 600 includes a platform body 610. Illustratively, as shown in fig. 9 and 10, the platform body 610 is fixedly mounted on the output end of the platform elevating mechanism 120, and the platform body 610 is located between the extrusion head 300 and the base 110. An air heater 620 is fixedly mounted in the platform body 610, a heat conducting plate 630 is mounted on the air heater 620, and the other side wall of the heat conducting plate 630 is attached to the inner wall of the top of the platform body 610. All be provided with a set of curb plate 640, a plurality of groups top edge all around platform body 610 end to end is consecutive between the curb plate 640. The inner cavity of the side plate 640 is communicated with the output end of the air heater 620 through a pipeline. A plurality of groups of first air outlets 650 are arranged on a side wall of the side plate 640 close to the center line of the platform body 610 at equal intervals along the horizontal direction. The heights of the two ends of the first air outlet 650 are the same. A plurality of groups of second air outlets 660 are arranged above each group of first air outlets 650 at equal intervals along the vertical direction. The height of one end of the second air outlet 660 close to the inner cavity of the side plate 640 is lower than that of the other end. A plurality of groups of third air outlets 670 are arranged under each group of the first air outlets 650 at equal intervals in the vertical direction, and one end of each third air outlet 670, which is close to the inner cavity of the side plate 640, is higher than the other end. The heat conducting plate 630 is made of copper, but not limited thereto.

The raw materials wire rod after the hot melt is accomplished can be thick liquid, then through the pipe-line transportation to extrude in the head 300, utilizes the electronic slip table 200 of biax to drive and extrudes head 300 and can realize two ascending motions of orientation simultaneously, recycles platform elevating system 120 and drives platform body 610 vertical lift. So that the extrusion head 300 can print out any desired 3D model on the platform body 610.

And when 3D printing is carried out, hot air is generated by the working of the air heater 620, the heat conducting plate 630 is heated to 60-75 ℃, and the 3D model is heated and baked from the bottom by utilizing the heat conducting plate 630, so that the curing effect is realized. Then, the hot air blower 620 delivers the rest of the hot air to the cavities of the side plates 640, and the hot air is delivered to the side walls of the 3D model through the first air outlet 650, the second air outlet 660, and the third air outlet 670. The second outlet 660 above the first outlet 650 has a higher height at one end near the center of the platen body 610 than at the other end, and the third outlet 670 below the first outlet 650 has a lower height at one end near the center of the platen body 610 than at the other end, so that hot air is blown radially onto the surface of the 3D model. The contact area between hot air and the 3D model is increased, and the curing effect is improved while the fixing function is realized.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides a 3D printer which characterized in that: the extrusion device comprises a machine body (100), wherein a printing platform (600) is connected to one side wall of the machine body (100) in a sliding manner along the vertical direction, an extrusion head (300) is arranged right above the printing platform (600), a feeding unit (400) is arranged in the machine body (100), and the bottom of the feeding unit (400) is communicated with a hot melting unit (500);

the fuser unit (500) includes a fuser drum (510); the top of the hot melting cylinder (510) is communicated with a feeding head (520), the top of the feeding head (520) is communicated with the bottom of the feeding unit (400), a first inner cylinder (540) is arranged in the hot melting cylinder (510), a second inner cylinder (550) is arranged in the first inner cylinder (540), the central axes of the first inner cylinder (540), the second inner cylinder (550) and the hot melting cylinder (510) are all coincided, gaps are arranged between the inner wall of the hot melting cylinder (510) and the outer wall of the first inner cylinder (540), and between the inner wall of the first inner cylinder (540) and the outer wall of the second inner cylinder (550); the inner wall and the outer wall of the first inner cylinder (540) and the second inner cylinder (550) and the inner wall of the hot melting cylinder (510) are evenly distributed with a plurality of groups of grinding blocks (560), and the tops of the grinding blocks (560) are provided with inclined planes; a hot-melting air inlet (511) is formed in the outer wall of the hot-melting cylinder (510), and one end of the hot-melting air inlet (511) is communicated with a heat transfer rod (512); the other end of the heat transfer rod (512) sequentially penetrates through the first inner cylinder (540) and the second inner cylinder (550) and is fixedly connected with the inner walls of the first inner cylinder (540) and the second inner cylinder (550); the bottom of the hot melting cylinder (510) is communicated with a material outlet head (570), and the other end of the material outlet head (570) is communicated with the output end of the extrusion head (300).

2. A 3D printer according to claim 1, characterized in that: a double-shaft electric sliding table (200) is arranged right above the printing platform (600), and the extrusion head (300) is connected to the output end of the double-shaft electric sliding table (200) in a sliding manner; a servo motor (140) is installed on one side wall of the machine body (100) far away from the base (110), a bevel gear (150) is connected to the output end of the servo motor (140) in a transmission mode, and the other end of the bevel gear (150) is connected with a power input portion of the feeding unit (400) in a transmission mode.

3. 3D printer according to claim 2, characterized in that: the machine body (100) is internally provided with hot-melting heating equipment (130), and the output end of the hot-melting heating equipment (130) is communicated with the feeding unit (400) and the hot-melting unit (500).

4. 3D printer according to claim 2, characterized in that: the feeding unit (400) comprises a preheating mechanism (410); preheating mechanism (410) is including preheating a section of thick bamboo (411), install at organism (100) top preheating a section of thick bamboo (411), just preheating a section of thick bamboo (411) bottom extends to organism (100), first passageway (412) have been seted up to preheating a section of thick bamboo (411) center department, set up passageway inner wall chamber (413) in the inner wall of first passageway (412), set up on the lateral wall of first passageway (412) is kept away from in passageway inner wall chamber (413) and preheated air inlet (415), preheat air inlet (415) other end and pass through pipeline and hot melt heating equipment (130) intercommunication.

5. The 3D printer of claim 4, wherein: preheating openings (414) are evenly distributed on one side wall of the channel inner wall cavity (413) close to the first channel (412), and the other ends of the preheating openings (414) are communicated with the first channel (412); the inner diameter of the preheating opening (414) close to one end of the first channel (412) is smaller than that of the other end; the bottom of the preheating cylinder (411) is rotatably connected with a first sealing bearing (430), and the bottom of the first sealing bearing (430) is rotatably connected with a spiral wire feeding mechanism (420).

6. The 3D printer of claim 5, wherein: the spiral wire feeding mechanism (420) comprises a wire feeding cylinder (421), a second channel (422) is formed in the center of the wire feeding cylinder (421), and the top of the second channel (422) is communicated with the first channel (412) through a first sealing bearing (430); spiral convex strips (423) are installed on the inner wall of the second channel (422) in a spiral mode, and a plurality of groups of anti-skidding lugs (424) are arranged on the spiral convex strips (423) at equal intervals.

7. The 3D printer of claim 6, wherein: the outer wall of the wire feeding cylinder (421) is sleeved with a bevel gear (440), and the bevel gear (440) is in meshed connection with the bevel gear (150); the bottom of the wire feeding cylinder (421) is rotatably connected with a second sealing bearing (450).

8. The 3D printer of claim 1, wherein: a plurality of groups of cutting blades (530) are arranged in the feed head (520) at equal intervals, the blade points of the cutting blades (530) are positioned at the tops of the cutting blades, and a plurality of groups of auxiliary cutting blades (531) are arranged on the two side walls of the cutting blades (530) at equal intervals.

9. A 3D printer according to claim 1, characterized in that: the printing platform (600) comprises a platform body (610); the platform body (610) is connected to one side wall, close to the extrusion head (300), of the machine body (100) in a sliding mode along the vertical direction, and the platform body (610) is located right below the extrusion head (300); an air heater (620) is fixedly installed in the platform body (610), a heat conducting plate (630) is installed on the air heater (620), and the other side wall of the heat conducting plate (630) is attached to the inner wall of the top of the platform body (610); a group of side plates (640) are arranged at the top edges of the periphery of the platform body (610), and the side plates (640) are connected end to end in sequence; the inner cavity of the side plate (640) is communicated with the output end of the air heater (620) through a pipeline.

10. A 3D printer according to claim 9, characterized in that: a plurality of groups of first air outlets (650) are arranged on one side wall of the side plate (640) close to the center line of the platform body (610) at equal intervals along the horizontal direction; the heights of the two ends of the first air outlet (650) are the same; a plurality of groups of second air outlets (660) are arranged above each group of first air outlets (650) at equal intervals along the vertical direction; the height of one end, close to the inner cavity of the side plate (640), of the second air outlet (660) is lower than that of the other end, and the subsequent steps are the same; and a plurality of groups of third air outlets (670) are arranged under each group of the first air outlets (650) at equal intervals along the vertical direction, and one end of each third air outlet (670) close to the inner cavity of the side plate (640) is higher than the other end of the third air outlet.