CN109571958B

CN109571958B - 3D printer

Info

Publication number: CN109571958B
Application number: CN201811386320.XA
Authority: CN
Inventors: 不公告发明人
Original assignee: Guangzhou Quke Information Technology Co ltd
Current assignee: Guangzhou Quke Information Technology Co.,Ltd.
Priority date: 2017-06-07
Filing date: 2017-06-07
Publication date: 2020-10-27
Anticipated expiration: 2037-06-07
Also published as: CN109940874A; CN107020751B; CN107020751A; CN109571958A; CN109940874B

Abstract

The invention relates to a 3D printer which comprises a base, a controller, a printing platform, a top plate, a lifting plate, a plane moving mechanism, a printing mechanism and two lifting units, wherein the printing mechanism comprises a material disc, a wire feeding pipe, a heating device, a first flow pipe, a flow guide box, a second flow pipe and a printing spray head, the flow guide mechanism is arranged in the flow guide box and comprises a second driving motor, a first connecting rod, a second connecting rod, a piston, a flow guide cylinder, a blocking mechanism and two third flow pipes, in order to fix the sliding track of the piston, the flow guide cylinder is internally provided with the limiting mechanism, the limiting mechanism comprises a limiting ring and two limiting rods, the two limiting rods are respectively arranged on two sides of the limiting ring, and the limiting ring is sleeved on the piston and is fixedly connected with the inner wall of the flow guide cylinder through the limiting. The invention improves the precision of the printed sample and the practicability of the equipment.

Description

3D printer

The patent application of the invention aims at the following application numbers: 2017104215294, the filing date of the original application is: 2017-06-07, the name of invention creation is: an intelligent 3D printer that printing accuracy is high.

Technical Field

The invention relates to the field of 3D printing equipment, in particular to a 3D printer.

Background

The 3D printer, also called three-dimensional printer, is an accumulative manufacturing technique, i.e. a machine of rapid prototyping technique, which is based on digital model files, and uses special bondable materials such as wax, powdered metal or plastic to manufacture three-dimensional objects by using the bondable materials layer by layer. At present, a three-dimensional printer is used for manufacturing products, an object is constructed in a layer-by-layer printing mode, data and raw materials are put into a 3D printer, and the machine can manufacture the products layer by layer according to a program.

When the 3D printer is used for printing, if a first layer of material cannot be normally attached to a printing platform, the later-stage printing can be directly influenced, therefore, before printing, a user can calibrate the horizontal angle of the printing platform and also can heat the printing platform by adopting a heating pad, so that the temperature difference between the platform and a nozzle extrusion material is reduced, the material is prevented from being not attached to the printing platform after being subjected to cold shrinkage, the material of the first layer can be ensured to be attached to the printing platform, but the heating pad is usually used for heating the whole plane of the printing platform in a heating mode, so that more electric energy is consumed during heating, and in addition, in the printing process, due to the reasons of uneven thickness degree of a material wire and unstable temperature of the nozzle, the material amount extruded by the nozzle at every moment is uneven, and the layer height and the layer thickness of each layer of a printing sample are different, the edges of the side surfaces of the sample are uneven and form a stripe shape, so that the surface of the sample is uneven and smooth, the precision of the printed sample is influenced, and the practicability of the printer is reduced.

Disclosure of Invention

1. Technical problem to be solved by the invention

The technical problem to be solved by the invention is as follows: in order to overcome the defects of the prior art, a 3D printer is provided.

2. Technical scheme

The technical scheme adopted by the invention for solving the technical problems is as follows: an intelligent 3D printer with high printing precision comprises a base, a controller, a printing platform, a top plate, a lifting plate, a plane moving mechanism, a printing mechanism and two lifting units, wherein the controller is fixed on the base, the printing platform is fixed above the controller, the two lifting units are respectively arranged on two sides of the printing platform, the top plate is erected on the two lifting units, the lifting plate is arranged between the two lifting units and is positioned below the top plate, the lifting units are in transmission connection with the lifting plate, and the plane moving mechanism is arranged below the lifting plate;

the printing mechanism comprises a material disc, a wire feeding pipe, a heating device, a first flow pipe, a flow guide box, a second flow pipe and a printing nozzle, wherein the material disc is arranged above a top plate, the heating device and the flow guide box are both fixed above a lifting plate, the printing nozzle is arranged below a plane moving mechanism, the plane moving mechanism is in transmission connection with the printing nozzle, the material disc is communicated with the heating device through the wire feeding pipe, the heating device is communicated with the flow guide box through the first flow pipe, and the flow guide box is communicated with the printing nozzle through the second flow pipe;

the flow guide box is internally provided with a flow guide mechanism, the flow guide mechanism comprises a second driving motor, a first connecting rod, a second connecting rod, a piston, a flow guide cylinder, a blocking mechanism and two third flow tubes, the second driving motor is in transmission connection with the first connecting rod, the first connecting rod is hinged with one end of the piston through the second connecting rod, the other end of the piston is arranged in the flow guide cylinder, the blocking mechanism and the two third flow tubes are arranged on one side of the flow guide cylinder and far away from the second driving motor, the blocking mechanism is arranged between the two third flow tubes, the flow guide cylinder is communicated with the first flow tube through one of the third flow tubes, and the flow guide cylinder is communicated with the second flow tube through the other third flow tube;

the controller is internally provided with a heating mechanism, the heating mechanism comprises a heating unit and two translation units, the two translation units are respectively arranged on two sides of the heating unit, and the translation units are in transmission connection with the heating unit.

Preferably, in order to drive the lifting plate to move up and down to realize layer-by-layer printing, the lifting unit comprises a first driving motor, a first driving shaft, a moving block and a buffer block, the first driving motor is fixed on the base and is in transmission connection with the first driving shaft, external threads are arranged on the periphery of the first driving shaft, the moving block is sleeved on the first driving shaft and is fixedly connected with the lifting plate, internal threads are arranged in the moving block, the internal threads in the moving block are matched with the external threads on the first driving shaft, and the buffer block is arranged at the top end of the first driving shaft and is fixed below the top plate.

Preferably, in order to control the circulation of the two third flow pipes, the blocking mechanism comprises a third driving motor, a third driving shaft, an eccentric wheel, a frame and two blocking plates, the third driving motor is fixed on the guide cylinder and is in transmission connection with the eccentric wheel through the third driving shaft, the eccentric wheel is arranged in the frame, the two blocking plates are respectively fixed on the upper side and the lower side of the frame, and the number of the blocking plates is equal to that of the third flow pipes and corresponds to that of the third flow pipes one by one.

Preferably, in order to fix the sliding track of the piston, a limiting mechanism is arranged in the guide cylinder, the limiting mechanism comprises a limiting ring and two limiting rods, the two limiting rods are respectively arranged on two sides of the limiting ring, and the limiting ring is sleeved on the piston and is fixedly connected with the inner wall of the guide cylinder through the limiting rods.

Preferably, in order to drive the heating unit to move and heat all parts of the printing platform, the translation unit comprises a conveyor belt and two driving units, one of the two driving units is in transmission connection with the other driving unit through the conveyor belt, the driving unit comprises a fourth driving motor, a fourth driving shaft and a driving gear, the fourth driving motor is in transmission connection with the driving gear through a fourth driving shaft, the driving gear is arranged in the conveyor belt, a plurality of driven teeth are arranged on the inner side of the conveyor belt, and the driven teeth are uniformly distributed on the inner side of the conveyor belt and are in transmission connection with the driving gear.

Preferably, for heating the printing platform, the heating unit comprises a heat insulation box and a conductive copper strip, the heat insulation box is fixed on the conveyor belt, and the conductive copper strip is arranged in the heat insulation box.

Preferably, in order to enable the conductive copper strip to be tightly attached to the bottom of the printing platform so as to improve the heating speed, a heat insulation plate and a plurality of springs are arranged in the heat insulation box, the heat insulation plate is fixed below the conductive copper strip and is connected with the bottom in the heat insulation box through the springs, and the springs are in a compressed state.

Preferably, in order to facilitate the user to observe and control the printing, the controller is provided with a display screen, a plurality of control keys and a plurality of USB interfaces.

Preferably, for convenience of operation, the control key is a touch key.

Preferably, in order to facilitate movement of the device, universal wheels are provided below the base.

When the intelligent 3D printer with high printing precision prints a first layer, in order to ensure that a printing material is tightly attached to a printing platform, prevent the problems of edge warping and the like and ensure the successful subsequent printing, the printing platform above a controller is preheated by a heating mechanism in the controller, when in preheating, the conductive copper bar is electrified to heat the conductive copper bar, the conductive copper bar transfers heat to the printing platform above the conductive copper bar under the action of the heat insulation box, so that the temperature right above the conductive copper bar on the printing platform is raised, the printer prints the part, and simultaneously, in the two translation units in the heating mechanism, the fourth driving motor drives the driving gear to rotate, the conveying belt is grabbed through the contact of the driven teeth, the heating unit is driven to move, the heating unit is enabled to preheat other parts of the printing platform in sequence, and after preheating is completed, the printing nozzle is moved to the part to be printed. Because in the preheating process, the mode that all parts heat in sequence is adopted, compared with the mode that the whole printing platform is continuously heated at one time, the heating mode can reduce the electric energy consumption and realize the energy-saving effect. This intelligent 3D printer that printing precision is high drives the heating unit through the translation unit and removes and preheat print platform in proper order, reduces power consumption, realizes energy-conserving effect.

In the printing process, in order to ensure the printing precision, the extrusion amount of the printing nozzle in unit time is accurately controlled by a flow guide mechanism in the flow guide box, so that the layer height of each layer is equal. In the diversion mechanism, a second driving motor drives a first connecting rod to rotate, the piston moves back and forth in the direction of the central axis of the piston through being hinged with the second connecting rod, meanwhile, a third driving motor in the blocking mechanism enables an eccentric wheel to rotate through a third driving shaft, and the frame moves up and down through being in contact with the frame. When the piston moves away from the direction of the guide cylinder, the frame moves downwards, the blocking plate below blocks the third flow pipe below, the third flow pipe above is communicated, the guide cylinder sucks the molten material in the heating device, then the piston moves towards the inside of the guide cylinder, the frame moves upwards, the blocking plate above is enabled to block the third flow pipe above, the blocking flow pipe below is communicated, the material enters the printing nozzle through the second flow pipe, and the printing nozzle flows out to print. The circular operation like this, because the displacement of piston at every turn is fixed unchangeable to the material volume that gets into and discharge in guaranteeing the guiding cylinder at every turn realizes printing the fixed of shower nozzle material extrusion capacity, has guaranteed the layer height on each printing layer, thereby has improved the precision of printing the sample and the practicality of equipment. This intelligent 3D printer that printing precision is high guarantees the material extrusion capacity of printing the shower nozzle at every turn through water conservancy diversion mechanism to the layer height that makes each print the layer is impartial, and then has improved the precision of printing the sample and the practicality of equipment.

3. Advantageous effects

The intelligent 3D printer with high printing precision has the advantages that the translation unit drives the heating unit to move to sequentially preheat the printing platform, the electric energy consumption is reduced, the energy-saving effect is realized, and in addition, the material extrusion amount of the printing nozzle at each time is ensured through the flow guide mechanism, so that the layer height of each printing layer is equal, and the precision of a printing sample and the practicability of equipment are improved.

Drawings

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 is a schematic structural diagram of an intelligent 3D printer with high printing precision according to the embodiment;

fig. 2 is a plan view of a flow guide mechanism of the intelligent 3D printer of the present embodiment with high printing accuracy;

FIG. 3 is a schematic structural diagram of a jam mechanism of the intelligent 3D printer of the present embodiment with high printing precision;

fig. 4 is a schematic structural diagram of a heating mechanism of the intelligent 3D printer of the present embodiment with high printing precision;

fig. 5 is a schematic structural diagram of a heating unit of the intelligent 3D printer with high printing precision according to the embodiment;

fig. 6 is a schematic structural diagram of a translation unit of the intelligent 3D printer with high printing precision according to the embodiment;

in the figure: 1. the printing device comprises a base, 2, a universal wheel, 3, a controller, 4, a display screen, 5, a USB interface, 6, a control key, 7, a printing platform, 8, a first driving motor, 9, a first driving shaft, 10, a moving block, 11, a buffer block, 12, a top plate, 13, a material plate, 14, a wire feeding pipe, 15, a heating device, 16, a first flow pipe, 17, a flow guide box, 18, a second flow pipe, 19, a printing spray head, 20, a lifting plate, 21, a plane moving mechanism, 22, a second driving motor, 23, a first connecting rod, 24, a second connecting rod, 25, a piston, 26, a flow guide cylinder, 27, a third flow pipe, 28, a third driving motor, 29, a third driving shaft, 30, a frame, 31, a blocking plate, 32, a limiting rod, 33, a limiting ring, 34, an eccentric wheel, 35, a translation unit, 36, a heating unit, 37, a heat insulation box, 38, a conductive copper bar, 39, a heat insulation plate, 40. spring, 41, fourth driving motor, 42, fourth driving shaft, 43, driving gear, 44, conveyor belt, 45 and driven teeth.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.

As shown in fig. 1 to 6, an intelligent 3D printer with high printing precision comprises a base 1, a controller 3, a printing platform 7, a top plate 12, a lifting plate 20, a plane moving mechanism 21, a printing mechanism and two lifting units, wherein the controller 3 is fixed on the base 1, the printing platform 7 is fixed above the controller 3, the two lifting units are respectively arranged at two sides of the printing platform 7, the top plate 12 is erected on the two lifting units, the lifting plate 20 is arranged between the two lifting units and below the top plate 12, the lifting units are in transmission connection with the lifting plate 20, and the plane moving mechanism 21 is arranged below the lifting plate 20;

the printing mechanism comprises a material disc 13, a wire feeding pipe 14, a heating device 15, a first flow pipe 16, a flow guide box 17, a second flow pipe 18 and a printing nozzle 19, the material disc 13 is arranged above the top plate 12, the heating device 15 and the flow guide box 17 are both fixed above a lifting plate 20, the printing nozzle 19 is arranged below a plane moving mechanism 21, the plane moving mechanism 21 is in transmission connection with the printing nozzle 19, the material disc 13 is communicated with the heating device 15 through the wire feeding pipe 14, the heating device 15 is communicated with the flow guide box 17 through the first flow pipe 16, and the flow guide box 17 is communicated with the printing nozzle 19 through the second flow pipe 18;

a diversion mechanism is arranged in the diversion box 17, the diversion mechanism comprises a second driving motor 22, a first connecting rod 23, a second connecting rod 24, a piston 25, a diversion cylinder 26, a blocking mechanism and two third flow pipes 27, the second driving motor 22 is in transmission connection with the first connecting rod 23, the first connecting rod 23 is hinged with one end of the piston 25 through the second connecting rod 24, the other end of the piston 25 is arranged in the diversion cylinder 26, the blocking mechanism and the two third flow pipes 27 are both arranged on one side of the diversion cylinder 26 and far away from the second driving motor 22, the blocking mechanism is arranged between the two third flow pipes 27, the diversion cylinder 26 is communicated with the first flow pipe 16 through one of the third flow pipes 27, and the diversion cylinder 26 is communicated with the second flow pipe 18 through the other third flow pipe 27;

be equipped with heating mechanism in the controller, heating mechanism includes heating unit 36 and two translation units 35, two translation unit 35 sets up respectively in heating unit 36's both sides, translation unit 35 is connected with heating unit 36 transmission.

Preferably, in order to drive the lifting plate 20 to move up and down to realize layer-by-layer printing, the lifting unit includes a first driving motor 8, a first driving shaft 9, a moving block 10 and a buffer block 11, the first driving motor 8 is fixed on the base 1 and is in transmission connection with the first driving shaft 9, an external thread is arranged on the periphery of the first driving shaft 9, the moving block 10 is sleeved on the first driving shaft 9 and is fixedly connected with the lifting plate 20, an internal thread is arranged in the moving block 10, the internal thread in the moving block 10 is matched with the external thread on the first driving shaft 9, and the buffer block 11 is arranged at the top end of the first driving shaft 9 and is fixed below the top plate 12.

Preferably, in order to control the flow of the two third flow pipes 27, the blocking mechanism comprises a third driving motor 28, a third driving shaft 29, an eccentric wheel 34, a frame 30 and two blocking plates 31, wherein the third driving motor 28 is fixed on the guide cylinder 26 and is in transmission connection with the eccentric wheel 34 through the third driving shaft 29, the eccentric wheel 34 is arranged in the frame 30, the two blocking plates 31 are respectively fixed on the upper side and the lower side of the frame 30, and the number of the blocking plates 31 is equal to that of the third flow pipes 27 and corresponds to that of the third flow pipes 27.

Preferably, in order to fix the sliding track of the piston 25, a limiting mechanism is arranged in the guide cylinder 26, the limiting mechanism includes a limiting ring 33 and two limiting rods 32, the two limiting rods 32 are respectively arranged at two sides of the limiting ring 33, and the limiting ring 33 is sleeved on the piston 25 and is fixedly connected with the inner wall of the guide cylinder 26 through the limiting rods 32.

Preferably, in order to drive the heating unit 36 to move and heat the printing platform 7, the translation unit 35 includes a conveyor belt 44 and two driving units, one of the two driving units is in transmission connection with the other driving unit through the conveyor belt 44, the driving unit includes a fourth driving motor 41, a fourth driving shaft 42 and a driving gear 43, the fourth driving motor 41 is in transmission connection with the driving gear 43 through the fourth driving shaft 42, the driving gear 43 is disposed in the conveyor belt 44, a plurality of driven teeth 45 are disposed on the inner side of the conveyor belt 44, and the driven teeth 45 are uniformly distributed on the inner side of the conveyor belt 44 and are in transmission connection with the driving gear 43.

Preferably, for heating the printing platform 7, the heating unit 36 comprises a thermally insulated box 37 and an electrically conductive copper strip 38, the thermally insulated box 37 being fixed to the conveyor belt 44, the electrically conductive copper strip 38 being arranged inside the thermally insulated box 37.

Preferably, in order to make the conductive copper strip 38 tightly contact with the bottom of the printing platform 7 so as to increase the heating speed, a heat insulation plate 39 and a plurality of springs 40 are arranged in the heat insulation box 37, the heat insulation plate 39 is fixed below the conductive copper strip 38 and is connected with the bottom in the heat insulation box 37 through the springs 40, and the springs 40 are in a compressed state.

Preferably, in order to facilitate the user to observe and control the printing, the controller 3 is provided with a display screen 4, a plurality of control keys 6 and a plurality of USB interfaces 5.

Preferably, the control key 6 is a touch key for convenient operation.

Preferably, a universal wheel 2 is provided under the base 1 to facilitate movement of the device.

When the intelligent 3D printer with high printing precision prints a first layer, in order to enable a printing material to be tightly attached to the printing platform 7 and prevent the problems of edge warping and the like and ensure the successful later printing, the printing platform 7 above the controller 3 is preheated by a heating mechanism in the controller 3, when the printing platform is preheated, the conductive copper bar 38 is electrified to enable the conductive copper bar 38 to generate heat, under the action of the heat insulation box 37, the conductive copper bar 38 transmits the heat to the printing platform 7 above, the temperature right above the conductive copper bar 38 on the printing platform 7 is increased, the later printer prints the part, meanwhile, in two translation units 35 in the heating mechanism, the fourth driving motor 41 drives the driving gear 43 to rotate, the driving gear 44 is grabbed by the contact of the driven gear 45 to drive the heating unit 36 to move, and the heating unit 36 sequentially preheats other parts of the printing platform 7, after the completion of the warm-up, the print head 19 moves to the position to perform printing. Because in the preheating process, the mode that all parts heat in sequence is adopted, compared with the mode that the whole printing platform 7 is continuously heated at one time, the heating mode can reduce the electric energy consumption and realize the energy-saving effect. This intelligent 3D printer that printing precision is high drives heating element 36 through translation unit 35 and removes and preheat print platform 7 in proper order, reduces power consumption, realizes energy-conserving effect.

In order to ensure the printing precision during the printing process, the extrusion amount of the printing nozzle 19 in unit time is precisely controlled by a flow guide mechanism in the flow guide box 17, so that the layer heights of all layers are equal. In the air guide mechanism, a second driving motor 22 rotates a first link 23 to move a piston 25 back and forth in the direction of the central axis thereof by being hinged to a second link 24, and at the same time, a third driving motor 28 in the jam mechanism rotates an eccentric 34 via a third driving shaft 29 to move a frame 30 up and down by being in contact with the frame 30. When the piston 25 moves away from the guide cylinder 26, the frame 30 moves downward to make the lower blocking plate 31 block the lower third flow pipe 27, the upper third flow pipe 27 is conducted, the guide cylinder 26 sucks the melted material in the heating device 15, then the piston 25 moves toward the interior of the guide cylinder 26, the frame 30 moves upward to make the upper blocking plate 31 block the upper third flow pipe 27, the lower blocking flow pipe 27 is conducted, the material enters the printing nozzle 19 through the second flow pipe 18 and flows out of the nozzle 19 for printing. The circulation operation is realized, because the moving distance of the piston 25 is fixed and unchanged at every time, the material quantity entering and discharging in the guide cylinder 26 is ensured, the material extrusion quantity of the printing spray head 19 is fixed, the layer height of each printing layer is ensured, and the precision of the printing sample and the practicability of the equipment are improved. This intelligent 3D printer that printing precision is high guarantees the material extrusion capacity of printing shower nozzle 19 at every turn through water conservancy diversion mechanism to the layer height that makes each print the layer is impartial, and then has improved the precision of printing the sample and the practicality of equipment.

Compared with the prior art, this intelligent 3D printer that printing precision is high drives heating unit 36 through translation unit 35 and removes and preheat print platform 7 in proper order, reduces power consumption, realizes energy-conserving effect, moreover, guarantees the material extrusion capacity of printing shower nozzle 19 at every turn through water conservancy diversion mechanism to the layer height that makes each print the layer is impartial, and then has improved the precision of printing the sample and the practicality of equipment.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

The 3D printer is characterized by comprising a base (1), a controller (3), a printing platform (7), a top plate (12), a lifting plate (20), a plane moving mechanism (21), a printing mechanism and two lifting units, wherein the controller (3) is fixed on the base (1), the printing platform (7) is fixed above the controller (3), the two lifting units are respectively arranged on two sides of the printing platform (7), the top plate (12) is erected on the two lifting units, the lifting plate (20) is arranged between the two lifting units and located below the top plate (12), the lifting units are in transmission connection with the lifting plate (20), and the plane moving mechanism (21) is arranged below the lifting plate (20);

the printing mechanism comprises a material disc (13), a wire feeding pipe (14), a heating device (15), a first flow pipe (16), a flow guide box (17), a second flow pipe (18) and a printing nozzle (19), the material disc (13) is arranged above a top plate (12), the heating device (15) and the flow guide box (17) are both fixed above a lifting plate (20), the printing nozzle (19) is arranged below a plane moving mechanism (21), the plane moving mechanism (21) is in transmission connection with the printing nozzle (19), the material disc (13) is communicated with the heating device (15) through the wire feeding pipe (14), the heating device (15) is communicated with the flow guide box (17) through the first flow pipe (16), and the flow guide box (17) is communicated with the printing nozzle (19) through the second flow pipe (18);

a flow guide mechanism is arranged in the flow guide box (17), the flow guide mechanism comprises a second driving motor (22), a first connecting rod (23), a second connecting rod (24), a piston (25), a flow guide cylinder (26), a blocking mechanism and two third flow pipes (27), the second driving motor (22) is in transmission connection with a first connecting rod (23), the first connecting rod (23) is hinged with one end of a piston (25) through a second connecting rod (24), the other end of the piston (25) is arranged in the diversion cylinder (26), the blocking mechanism and the two third flow pipes (27) are both arranged on one side of the diversion cylinder (26) and far away from the second driving motor (22), the blocking mechanism is arranged between two third flow pipes (27), the guide cylinder (26) is communicated with the first flow pipe (16) through one of the third flow pipes (27), the guide cylinder (26) is communicated with the second flow pipe (18) through another third flow pipe (27);

a heating mechanism is arranged in the controller, the heating mechanism comprises a heating unit (36) and two translation units (35), the two translation units (35) are respectively arranged on two sides of the heating unit (36), and the translation units (35) are in transmission connection with the heating unit (36);

the blocking mechanism comprises a third driving motor (28), a third driving shaft (29), an eccentric wheel (34), a frame (30) and two blocking plates (31), the third driving motor (28) is fixed on the guide cylinder (26) and is in transmission connection with the eccentric wheel (34) through the third driving shaft (29), the eccentric wheel (34) is arranged in the frame (30), the two blocking plates (31) are respectively fixed on the upper side and the lower side of the frame (30), and the number of the blocking plates (31) is equal to that of the third flow pipes (27) and corresponds to that of the third flow pipes one by one;

the translation unit (35) comprises a conveyor belt (44) and two driving units, wherein one driving unit is in transmission connection with the other driving unit through the conveyor belt (44), the driving unit comprises a fourth driving motor (41), a fourth driving shaft (42) and a driving gear (43), the fourth driving motor (41) is in transmission connection with the driving gear (43) through the fourth driving shaft (42), the driving gear (43) is arranged in the conveyor belt (44), a plurality of driven teeth (45) are arranged on the inner side of the conveyor belt (44), and the driven teeth (45) are uniformly distributed on the inner side of the conveyor belt (44) and are in transmission connection with the driving gear (43);

the heating unit (36) comprises a heat insulation box (37) and a conductive copper strip (38), the heat insulation box (37) is fixed on the conveyor belt (44), and the conductive copper strip (38) is arranged in the heat insulation box (37).
2. 3D printer according to claim 1, characterized in that inside the thermal insulation box (37) there is a thermal insulation plate (39) and several springs (40), the thermal insulation plate (39) is fixed under the conductive copper bar (38) and connected to the bottom inside the thermal insulation box (37) by means of springs (40), the springs (40) being in compression.
3. The 3D printer according to claim 1, characterized in that the controller (3) is provided with a display screen (4), a plurality of control keys (6) and a plurality of USB interfaces (5).
4. 3D printer according to claim 3, characterised in that the control key (6) is a tap key.
5. 3D printer according to claim 1, characterized in that the universal wheels (2) are provided below the base (1).