阅读说明：本技术 一种儿童3d打印机的自动退料装置 (Automatic material returning device of children's 3D printer ) 是由 赵敬 朱文利 叶建民 于 2021-07-20 设计创作，主要内容包括：本发明公开一种儿童3D打印机的自动退料装置,包括3D打印机本体和打印头,所述3D打印机本体侧面设有收绕机构,所述收绕机构上卡设有料丝线卷；所述3D打印机本体顶部设有料丝接入机构；所述打印头顶部中间沿竖直方向开设有进料通道,所述料丝接入机构通过料丝管道与所述进料通道连通,所述进料通道顶部侧壁设有料丝检测传感器,所述进料通道上部相对的侧壁上设有一对滚轮组件,所述进料通道下部侧壁上设有切割机构,所述进料通道中部的侧壁沿水平方向开设有贯穿的退料通道,所述打印头侧壁与所述退料通道对应处设有退料接收箱,所述进料通道侧壁与所述退料通道对应处设有料丝引导机构；本发明可自动退料,不需手动收料。(The invention discloses an automatic material returning device of a 3D printer for children, which comprises a 3D printer body and a printing head, wherein a winding mechanism is arranged on the side surface of the 3D printer body, and a material silk thread roll is clamped on the winding mechanism; the top of the 3D printer body is provided with a feed wire access mechanism; a feeding channel is formed in the middle of the top of the printing head in the vertical direction, the material wire access mechanism is communicated with the feeding channel through a material wire pipeline, a material wire detection sensor is arranged on the side wall of the top of the feeding channel, a pair of roller assemblies is arranged on the opposite side wall of the upper portion of the feeding channel, a cutting mechanism is arranged on the side wall of the lower portion of the feeding channel, a penetrating material returning channel is formed in the side wall of the middle of the feeding channel in the horizontal direction, a material returning receiving box is arranged at the position, corresponding to the material returning channel, of the side wall of the printing head, and a material wire guiding mechanism is arranged at the position, corresponding to the material returning channel, of the side wall of the feeding channel; the invention can automatically return materials without manual material collection.)

1. An automatic material returning device of a 3D printer for children comprises a 3D printer body and a printing head, and is characterized in that a winding mechanism is arranged on the side face of the 3D printer body, and a material wire coil is clamped on the winding mechanism; the top of the 3D printer body is provided with a material wire access mechanism which is used for accessing the material wire and driving the material wire to move; the utility model discloses a material feeding device, including the printer head, the printer head top is middle along vertical direction seted up feedstock channel, the material silk access mechanism through the material silk pipeline with feedstock channel intercommunication, feedstock channel top lateral wall is equipped with material silk detection sensor, be equipped with a pair of roller components on the relative lateral wall in feedstock channel upper portion, roller components is used for driving the material silk and removes, be equipped with cutting mechanism on the lateral wall of feedstock channel lower part for cut off the material silk, the material returned passageway that runs through is seted up along the horizontal direction to the lateral wall at feedstock channel middle part, the printer head lateral wall with material returned passageway corresponds the department and is equipped with the material returned receiving box, the material returned passageway is close to the one end of material returned receiving box is equipped with a pair of roller components, the feedstock channel lateral wall with material returned passageway corresponds the department and is equipped with material silk guiding mechanism for the guide material silk gets into the material returned passageway from feedstock channel.

2. The automatic material returning device of the 3D printer for the children as claimed in claim 1, wherein the winding mechanism includes a winding motor and a locking block, the winding motor is fixed on a side wall of the 3D printer body, the locking block is fixed at a terminal of an output shaft of the winding motor, and the material wire coil is locked at an outer periphery of the locking block; the clamping block and the cross section of the winding motor, which is vertical to the axial direction, are square.

3. The automatic material returning device of the 3D printer for children as claimed in claim 2, wherein a circular plate is disposed at one end of the engaging block close to the winding motor, the length of the side of the cross section of the engaging block is L1, the diameter of the circular plate is L2, the diameter of the winding motor is L3,l1 is more than or equal to L3; a round blind hole is formed in the center of the side face of the material silk thread roll and matched with the round sheet, a square through hole is formed in the bottom of the round blind hole and matched with the clamping block; the one end detachable of winding motor is installed to the block piece is kept away from the coiling, the separation blade is used for preventing that the material silk thread book from droing from the block piece.

4. The automatic material returning device of the 3D printer for the children as claimed in claim 1, wherein the access mechanism includes an access block, the access block is provided with a through access channel, a pair of the roller assemblies is provided on the opposite side walls of the access channel, and the access channel is communicated with the feeding channel through a material wire pipeline.

5. The automatic material returning device of the 3D printer for children as claimed in claim 1, wherein the roller assembly includes a roller motor, a rotation speed sensor and a friction roller, the rotation speed sensor is mounted on the roller motor for detecting a rotation speed of the roller motor, the friction roller is mounted at an end of an output shaft of the roller motor, and the friction roller is used for driving the material wire to move.

6. The automatic material returning device of the 3D printer for the children as claimed in claim 1, wherein the cutting mechanism includes a cutting component and a pushing component, the cutting component is used for cutting the material wire, and the pushing component is used for driving the cutting component to move.

7. The automatic material returning device of the 3D printer for the children as claimed in claim 6, wherein the cutting assembly includes a cutting motor, a cutting shaft, a pair of blades, a bearing, and a sliding block, the side wall of the feeding channel is provided with a mounting groove, the cutting shaft is vertically mounted in the mounting groove, the middle of the cutting shaft is provided with the pair of blades, the bearings are respectively arranged at two ends of the cutting shaft, the sliding block is fixedly arranged at the periphery of the bearing, the two sliding blocks are respectively slidably mounted at the upper portion and the lower portion of the mounting groove, the sliding block is a rectangular parallelepiped, the cutting motor is mounted at one end of the sliding block far away from the blades, the cutting motor is connected with the cutting shaft, and one side of the sliding block far away from the feeding channel is connected with the jacking assembly.

8. The automatic material returning device of the 3D printer for the children as claimed in claim 7, wherein the jacking assembly comprises a jacking rod, a connecting rod and a jacking cylinder, the jacking rod is arranged on one side of each of the two sliding blocks away from the feeding channel, the two jacking rods are arranged in a horizontal direction, the connecting rod is arranged between the two jacking rods, a cylinder mounting groove is formed in the bottom of the mounting groove, the jacking cylinder is mounted in the cylinder mounting groove, and the tail end of the output shaft of the jacking cylinder is fixed to the middle of the connecting rod.

9. The automatic material returning device of the 3D printer for the children as claimed in claim 1, wherein the material guiding mechanism comprises a guiding block and a guiding cylinder, a guiding groove is formed in a side wall of the feeding channel opposite to the material returning channel, the guiding cylinder is arranged in the guiding groove, the guiding block is arranged at an end of an output shaft of the guiding cylinder, and an arc-shaped slope surface is formed at one end of the guiding block, which is far away from the guiding cylinder.

10. The automatic material returning device of the 3D printer for the children as claimed in claim 1, wherein a junction of the feeding channel and the material returning channel is provided with a rounded corner; the guide chamber has been seted up to the feedstock channel lateral wall, the guide chamber is the radius platform form, the top surface in guide chamber with the bottom of material returned passageway and the bottom of guiding groove is in same level.

Technical Field

The invention belongs to the technical field of 3D printers, and particularly relates to an automatic material returning device of a 3D printer for children.

Background

The 3D printing technology is present in the mid-90 s of the 20 th century and is actually the latest rapid prototyping device using technologies such as photocuring and paper lamination. The printing machine is basically the same as the common printing working principle, the printing machine is filled with liquid or powder and other printing materials, the printing materials are overlapped layer by layer under the control of a computer after being connected with the computer, and finally, a blueprint on the computer is changed into a real object. 3D printing (3DP), one of the rapid prototyping technologies, is a technology that constructs an object by printing layer by layer using an adhesive material such as powdered metal or plastic based on a digital model file.

3D printing is typically achieved using digital technology material printers. The method is often used for manufacturing models in the fields of mold manufacturing, industrial design and the like, and is gradually used for directly manufacturing some products, and parts printed by the technology are already available. The technology is applied to the fields of jewelry, footwear, industrial design, construction, engineering and construction (AEC), automobiles, aerospace, dental and medical industries, education, geographic information systems, civil engineering, guns and others, and toys for children are made by using 3D printers, which are increasingly popular, and intelligent 3D printers for children's specialties are now on the market.

The Chinese patent with the publication number of CN108340577A discloses a long-service-life convenient 3D printer with an anti-blocking function, which comprises a shell, a nozzle, a conveying pipe, two connecting rods, two moving devices, a wire withdrawing mechanism and a cleaning mechanism, wherein the wire withdrawing mechanism comprises a fixed plate, a clamping assembly and two lifting assemblies, each lifting assembly comprises a driving unit, a transverse rod, a telescopic frame, a sliding chute, two moving blocks, two transmission blocks and two sliding blocks, the long-service-life convenient 3D printer with the anti-blocking function can prevent workers from forgetting to cause old wires to remain in the nozzle to be solidified to cause the blocking phenomenon by withdrawing the original wires and then adding new wires through the wire withdrawing mechanism, so that the practicability and the convenience of the 3D printer are stronger, the non-solidified plastics in the conveying pipe are cleaned through the cleaning mechanism, the normal work of the printer is prevented from being influenced by the blockage of the conveying pipe caused by the coagulation of the plastics on the inner wall of the conveying pipe, thereby can improve the life of this 3D printer. Although the wire withdrawing mechanism can realize automatic wire withdrawing, the withdrawn wires need to be collected manually, and the wire withdrawing mechanism is not convenient.

The chinese utility model patent with publication number CN206106378U discloses an automatic 3D printing filament withdrawing device, which comprises a cylindrical mounting seat installed between a feeding device and a filament feeding roller, wherein the middle parts of end covers at two ends of the mounting seat are provided with through holes for passing printing materials, the mounting seat is internally provided with a clean sponge tube, a horn-shaped spring piece and more than two cylindrical springs, the cylindrical springs are symmetrically arranged at the bottom of the end cover close to the feeding device in the through holes, the large-diameter end of the horn-shaped spring piece is connected to the bottom of the cylindrical springs, and the end part of the arc-shaped spring piece at the small-diameter end is clamped on the side part of the clean sponge tube; when printing, the arc-shaped elastic sheet provides clamping force for the cleaning sponge pipe, so that the printing material drives the cleaning sponge pipe to move downwards to stretch the cylindrical spring, and when printing is stopped, the cylindrical spring contracts to drive the printing material to automatically return. The 3D printing automatic wire withdrawing device has the advantages of being simple in structure, capable of automatically cleaning printing materials, capable of automatically withdrawing wires and preventing printing nozzles from being blocked and the like. Although the wire withdrawing mechanism can realize automatic wire withdrawing, the withdrawn wires need to be collected manually, and the wire withdrawing mechanism is not convenient.

The Chinese patent with the publication number of CN106738877A discloses a multi-precision printing head of a thermal fuse 3D printer and a printer with the same, and the multi-precision printing head comprises an extruder, a working platform, a driver and an integrated nozzle, wherein the working platform is used for installing the extruder, the driver and the integrated nozzle, the integrated nozzle comprises a plurality of nozzle units with different precisions, the extruder can extrude and retract wires, and the driver is used for driving the integrated nozzle to move along the working platform so that the wires extruded by the extruder can enter each nozzle unit of the integrated nozzle. Compared with the prior art, the multi-precision printing head of the thermal fuse 3D printer has the advantages and effects of breaking through the structural form of an extruder and a nozzle of the thermal fuse 3D printer, providing a multi-precision printing head structural design method, realizing the optimal combination of printing precision and printing speed through the multi-precision printing head design, and also constructing an array formed by a plurality of printing heads to realize function expansion. Although the wire withdrawing mechanism can realize automatic wire withdrawing, the withdrawn wires need to be collected manually, and the wire withdrawing mechanism is not convenient.

Present children's 3D printer moves back the silk and needs children's manual coordination operation, and is not too safe to children, needs to design a full-automatic material returned device and moves back the silk.

Disclosure of Invention

The invention aims to provide an automatic material returning device of a 3D printer for children, and the automatic material returning device solves the problem that the existing 3D printer for children needs manual cooperation of children for wire returning.

In order to achieve the purpose, the invention adopts the technical scheme that:

an automatic material returning device of a 3D printer for children comprises a 3D printer body and a printing head, wherein a winding mechanism is arranged on the side face of the 3D printer body, and a material silk thread roll is clamped on the winding mechanism; the top of the 3D printer body is provided with a material wire access mechanism which is used for accessing the material wire and driving the material wire to move; the utility model discloses a material feeding device, including the printer head, the printer head top is middle along vertical direction seted up feedstock channel, the material silk access mechanism through the material silk pipeline with feedstock channel intercommunication, feedstock channel top lateral wall is equipped with material silk detection sensor, be equipped with a pair of roller components on the relative lateral wall in feedstock channel upper portion, roller components is used for driving the material silk and removes, be equipped with cutting mechanism on the lateral wall of feedstock channel lower part for cut off the material silk, the material returned passageway that runs through is seted up along the horizontal direction to the lateral wall at feedstock channel middle part, the printer head lateral wall with material returned passageway corresponds the department and is equipped with the material returned receiving box, the material returned passageway is close to the one end of material returned receiving box is equipped with a pair of roller components, the feedstock channel lateral wall with material returned passageway corresponds the department and is equipped with material silk guiding mechanism for the guide material silk gets into the material returned passageway from feedstock channel.

According to the invention, the printing head can be controlled to realize 3D printing through the arranged 3D printer body; the winding mechanism is used for mounting the wire coil and driving the wire coil to rotate; the arranged raw material wire coil can be wound with raw material wires for 3D printing; through the arranged material wire access mechanism, the material wire can be conveyed to the printing head for printing after being inserted into the material wire access mechanism; the feeding wire enters the printing head through the arranged feeding channel and passes through the printing head; the feeding channel is communicated with the feeding mechanism through the arranged material wire pipeline, one end of the material wire is inserted into the material wire access mechanism, then the material wire is driven by the material wire access mechanism and pushed into the feeding channel arranged on the printing head through the material wire pipeline, and whether the material wire exists at the top of the feeding channel or not can be detected through a material wire detection sensor arranged at the top of the feeding channel; the roller components through setting up are used for the drive material silk to remove, are used for cutting the material silk through the cutting mechanism who sets up, and through the material returned passageway that sets up, the confession material silk passes through when the material returned, is used for receiving the material silk that is exited from through the material returned receiving box that sets up, through the material silk guiding mechanism who sets up for the guide material silk gets into the material returned passageway from feedstock channel.

When the material returning device is used for returning materials, the length of the material wire needs to be detected firstly, then the material returning mode is selected, whether the material wire is arranged at the top of the feeding channel is detected through the material wire detection sensor firstly, if the material wire is not arranged, the rest material wire is short, and the material wire can be directly extruded out from the printing head; if the top of the feeding channel is provided with the material wire, the material wire is cut off by using a cutting mechanism, the melted material wire is extruded by a printing head, whether the material wire is separated from a material wire coil is detected, the material wire coil is driven to take up the material wire by a winding mechanism, if the roller component is driven to rotate, the material wire is still wound on the material wire coil, and the material wire can be returned only by continuously winding the material wire coil; if the winding mechanism drives the material wire coil to rotate and take up the wire, the roller component is not driven to rotate, the material wire is explained to be separated from the material wire coil, the roller component on the upper portion of the printing head drives the material wire to return to the upper portion of the material returning channel, the material feeding channel is blocked by the material wire guiding mechanism, the material wire is driven to move downwards, the material wire is guided into the material returning channel after contacting the material wire guiding mechanism until contacting the roller component in the material returning channel, and the material wire continues to be driven to move until the material wire completely enters the material returning collecting box to be collected.

Specifically, the winding mechanism comprises a winding motor and a clamping block, the winding motor is fixed on the side wall of the 3D printer body, the clamping block is fixed at the tail end of an output shaft of the winding motor, and the wire coil is clamped on the periphery of the clamping block; the clamping block and the winding motor are square in axial vertical section, the clamping block and the winding motor are used for mounting the material wire coil, the cross section of the clamping block is arranged to be square, relative rotation between the clamping block and the material wire coil can be prevented, the winding motor is used for driving the material wire coil to rotate, and then the material wire can be wound.

Furthermore, one end of the clamping block, which is close to the winding motor, is provided with a circular sheet for limiting the installation position of the material wire coil, the side length of the cross section of the clamping block is L1, the diameter of the circular sheet is L2, the diameter of the winding motor is L3, L2 is not less than L1, and L1 is not less than L3; a round blind hole is formed in the center of the side face of the material silk thread roll and matched with the round sheet, a square through hole is formed in the bottom of the round blind hole and matched with the clamping block; the square through hole and the round blind hole formed in the wire coil can be used for the winding motor to pass through, and the square through hole cannot be used for the round piece to pass through and can block the round piece; the one end detachable of winding motor is installed to the block piece is kept away from the coiling, the separation blade is used for preventing that the material silk thread book from droing from the block piece.

Specifically, the access mechanism includes the access block, set up the access passageway that runs through on the access block, be equipped with a pair of on the relative lateral wall of access passageway roller components, the access passageway through the stocksilk pipeline with feedstock channel intercommunication supplies the access stocksilk through the access block that sets up, the stocksilk inserts from the one end that the stocksilk pipeline was kept away from to the access passageway, and when the stocksilk injects and inserts between a pair of roller components that the access passageway lateral wall set up, the stocksilk can be driven by roller components and move towards the stocksilk pipeline, gets into the feedstock channel that the stocksilk piping shaft got into and set up on the print head.

Specifically, the roller assembly comprises a roller motor, a rotation speed sensor and a friction roller, wherein the rotation speed sensor is installed on the roller motor and used for detecting the rotation speed of the roller motor, the friction roller is installed at the tail end of an output shaft of the roller motor and used for driving a material wire to move, and a roller electrode is used for driving the friction roller to rotate.

Specifically, cutting mechanism includes cutting component and jacking subassembly, cutting component is used for cutting the material silk, jacking subassembly is used for driving cutting component removes.

Furthermore, the cutting assembly comprises a cutting motor, a cutting shaft, a pair of blades, a bearing and a sliding block, wherein a mounting groove is formed in the side wall of the feeding channel, the cutting shaft is vertically arranged in the mounting groove, the pair of blades is arranged in the middle of the cutting shaft, the bearing is arranged at each of two ends of the cutting shaft, the sliding block is fixedly arranged on the periphery of the bearing, the two sliding blocks are respectively arranged on the upper portion and the lower portion of the mounting groove in a sliding manner, the sliding block is a cuboid, the cutting motor is arranged at one end, away from the blades, of the sliding block, connected with the cutting shaft, one side, away from the feeding channel, of the sliding block is connected with the jacking assembly, the cutting shaft can be driven to rotate by the arranged cutting motor, the pair of blades can be driven to rotate accordingly, the cutting of the material wires can be realized, and the mounting groove is formed by the arranged sliding blocks in a matching manner, the slider can be linear motion along the horizontal direction in the mounting groove, and the slider is the cuboid, and the cutting axle rotates and can not drive the slider and rotate, and the slider can't rotate in the mounting groove, and the bearing is passed through at the both ends of cutting axle and installs on the slider.

Further, the jacking assembly comprises ejector rods, connecting rods and jacking cylinders, the ejector rods are arranged on one sides of the feeding channels, the ejector rods are arranged horizontally, the connecting rods are arranged between the ejector rods, cylinder mounting grooves are formed in the bottoms of the mounting grooves, the jacking cylinders are mounted in the cylinder mounting grooves, the tail ends of output shafts of the jacking cylinders are fixed to the middle portions of the connecting rods, the jacking cylinders can drive the connecting rods to move through the arranged jacking cylinders, the ejector rods can drive the ejector rods to move, the ejector rods drive the sliders to move, and finally the ejector rods drive the blades to move towards the material wires in the feeding channels.

Further, the wire guiding mechanism comprises a guiding block and a guiding cylinder, wherein a guiding groove is formed in the side wall, opposite to the material returning channel, of the feeding channel, the guiding groove is formed in the guiding groove, the guiding cylinder is arranged in the guiding groove, the tail end of an output shaft of the guiding cylinder is provided with the guiding block, the guiding block is far away from one end of the guiding cylinder, an arc-shaped surface is formed in the end, used for installing the guiding cylinder and the guiding block, the guiding cylinder can drive the guiding block to move, the feeding channel can be plugged by the guiding block, and the arc-shaped surface formed in the guiding block can guide the wire to bend and enter the material returning channel.

Furthermore, a fillet is arranged at the joint of the feeding channel and the material returning channel, so that the material wire can conveniently enter the material returning channel; the guide chamber has been seted up to the feedstock channel lateral wall, the guide chamber is the radius platform form, the top surface in guide chamber with the bottom of material returned passageway and the bottom of guiding groove is in same level, and when the guide piece did not plug up the guide chamber, the guide chamber can guide the material silk to get into the feedstock channel of material returned passageway below.

Compared with the prior art, the invention has the beneficial effects that: when the material returning device is used for returning materials, the length of the material wire needs to be detected firstly, then the material returning mode is selected, whether the material wire is arranged at the top of the feeding channel is detected through the material wire detection sensor firstly, if the material wire is not arranged, the rest material wire is short, and the material wire can be directly extruded out from the printing head; if the top of the feeding channel is provided with the material wire, the material wire is cut off by using a cutting mechanism, the melted material wire is extruded by a printing head, whether the material wire is separated from a material wire coil is detected, the material wire coil is driven to take up the material wire by a winding mechanism, if the roller component is driven to rotate, the material wire is still wound on the material wire coil, and the material wire can be returned only by continuously winding the material wire coil; if the winding mechanism drives the material wire coil to rotate and take up the wire, the roller component is not driven to rotate, the material wire is described to be separated from the material wire coil, the roller component on the upper portion of the printing head drives the material wire to return to the upper portion of the material returning channel, the material feeding channel is blocked by the material wire guiding mechanism, the material wire is driven to move downwards, the material wire is guided into the material returning channel after contacting the material wire guiding mechanism until contacting the roller component in the material returning channel, the material wire continues to be driven to move until all the material wire enters the material returning collecting box to be collected, the full automation of material returning of the material wire can be realized, the material returning is not required to be manually matched, and the use of children is safer.

Drawings

FIG. 1 is a schematic structural view of an automatic material returning device of a 3D printer for children according to the present invention;

FIG. 2 is a schematic view of the winding mechanism of the present invention;

FIG. 3 is a schematic view of a thread roll structure according to the present invention;

FIG. 4 is a schematic structural view of a feed wire insertion mechanism according to the present invention;

FIG. 5 is a schematic view of a partial structure of a printhead according to the present invention;

FIG. 6 is an enlarged view of the structure at A in FIG. 5;

FIG. 7 is an enlarged view of the structure at B in FIG. 5;

FIG. 8 is an enlarged view of the structure at C in FIG. 5;

FIG. 9 is a side cross-sectional view of the mounting groove of the present invention;

FIG. 10 is a schematic view of the roller assembly of the present invention;

FIG. 11 is a schematic structural view of the wire guiding mechanism for blocking the feeding channel;

in the figure: 1. a 3D printer body; 2. a print head; 3. winding the material silk thread; 4. a feed channel; 5. a wire pipe; 6. a wire detecting sensor; 7. a material returning channel; 8. a material return receiving box; 9. a winding motor; 10. a clamping block; 11. a circular sheet; 12. a circular blind hole; 13. a square through hole; 14. a baffle plate; 15. an access block; 16. accessing a channel; 17. a roller motor; 18. rubbing the roller; 19. cutting the motor; 20. cutting the shaft; 21. a blade; 22. a slider; 23. mounting grooves; 24. a top rod; 25. a connecting rod; 26. jacking into the cylinder; 27. a cylinder mounting groove; 28. a guide block; 29. a guide cylinder; 30. a guide groove; 31. an arc-shaped slope surface; 32. rounding off; 33. a guide chamber; 34. a light emitting diode; 35. a roller chamber.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. 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.

As shown in fig. 1, the automatic material returning device of a 3D printer for children provided in this embodiment includes a 3D printer body 1 and a printing head 2 (as shown in fig. 5), a winding mechanism (as shown in fig. 2) is disposed on a side surface of the 3D printer body 1, and a stock wire coil 3 (as shown in fig. 3) is clamped on the winding mechanism; the top of the 3D printer body 1 is provided with a material wire access mechanism (shown in figure 4) for accessing the material wire and driving the material wire to move; a feeding channel 4 is arranged in the middle of the top of the printing head 2 along the vertical direction, the wire feeding mechanism is communicated with the feeding channel 4 through a wire feeding pipeline 5, a wire detecting sensor 6 (shown in fig. 6) is arranged on the side wall of the top of the feeding channel 4, a pair of roller assemblies are arranged on the opposite side wall of the upper part of the feeding channel 4 and used for driving the wire to move, a cutting mechanism (shown in fig. 8) is arranged on the side wall of the lower part of the feeding channel 4 and used for cutting off the wire, a penetrating material returning channel 7 is arranged on the side wall of the middle part of the feeding channel 4 along the horizontal direction, a material returning receiving box 8 is arranged at the position of the side wall of the printing head 2 corresponding to the material returning channel 7, a pair of roller assemblies is arranged at one end of the material returning channel 7 close to the material returning receiving box 8, a wire guiding mechanism (shown in fig. 7 and 11) is arranged at the position of the side wall of the feeding channel 4 corresponding to the material returning channel 7, for guiding the wire from the feed channel 4 into the return channel 7.

In the embodiment, the printing head 2 can be controlled to realize 3D printing through the arranged 3D printer body 1; the winding mechanism is used for installing the wire coil 3 and can drive the wire coil 3 to rotate; the arranged wire coil 3 can be wound with raw material wires for 3D printing; through the arranged material wire access mechanism, the material wire can be sent to the printing head 2 for printing after being inserted into the material wire access mechanism; the material wire enters the printing head 2 through the opened feeding channel 4 and passes through the printing head 2; the feeding channel 4 is communicated with the feeding wire access mechanism through the arranged feeding wire pipeline 5, one end of the feeding wire is inserted into the feeding wire access mechanism, then the feeding wire is driven by the feeding wire access mechanism and pushed into the feeding wire pipeline 5, the feeding wire enters the feeding channel 4 formed in the printing head 2 through the feeding wire pipeline 5, and whether the feeding wire exists at the top of the feeding channel 4 or not can be detected through a feeding wire detection sensor 6 arranged at the top of the feeding channel 4; the roller components through setting up are used for the drive material silk to remove, are used for cutting the material silk through the cutting mechanism who sets up, and through the material returned passageway 7 that sets up, the confession material silk passes through when the material returned, is used for receiving the material silk that is withdrawed from through the material returned receiving box 8 that sets up, through the material silk guiding mechanism who sets up for the guide material silk gets into material returned passageway 7 from feedstock channel 4.

In the embodiment, when returning, the length of the material filament needs to be detected firstly, then the material returning mode is selected, whether the material filament exists at the top of the feeding channel 4 is detected by the material filament detection sensor 6 firstly, if the material filament does not exist, the residual material filament is short, and the material filament can be directly and completely extruded by the printing head 2; if the top of the feeding channel 4 is provided with the material wire, the material wire is cut off by using a cutting mechanism, the melted material wire is extruded out by the printing head 2, whether the material wire is separated from the material wire coil 3 or not is detected, the material wire coil 3 is driven to take up the wire by the winding mechanism, if the roller component is driven to rotate, the material wire is still wound on the material wire coil 3, and the material wire can be returned only by continuously winding the material wire coil 3; if receive around mechanism drive material silk thread book 3 and rotate and receive the line, wheel components is not driven and then rotates, then explain that the material silk has broken away from with material silk thread book 3, the wheel components through 2 upper portions of printer head drive the material silk and roll back to material returned passageway 7 top this moment, reuse material silk guiding mechanism and block up feed channel 4, drive material silk down-shifting, the material silk is guided to material returned passageway 7 behind the contact of material silk guiding mechanism in, until with the contact of the wheel components in the material returned passageway 7, the material silk continues to be driven and is moving, until all get into in the material returned collecting box and collected.

Specifically, the winding mechanism comprises a winding motor 9 and a clamping block 10, the winding motor 9 is fixed on the side wall of the 3D printer body 1, the clamping block 10 is fixed at the tail end of an output shaft of the winding motor 9, and the wire coil 3 is clamped on the periphery of the clamping block 10; the section of the clamping block 10, which is axially vertical to the winding motor 9, is square, the clamping block and the winding motor are used for mounting the wire coil 3, the section of the clamping block 10 is square, so that the clamping block 10 and the wire coil 3 can be prevented from rotating relatively, and the winding motor 9 is used for driving the wire coil 3 to rotate, so that the wire can be wound; the wire coil 3 is detachably arranged on the winding mechanism, so that the wire is convenient to replace.

Furthermore, a circular sheet 11 is arranged at one end, close to the winding motor 9, of the clamping block 10 and used for limiting the installation position of the wire coil 3, the side length of the cross section of the clamping block 10 is L1, the diameter of the circular sheet 11 is L2, the diameter of the winding motor 9 is L3, L2 is not less than L1, and L1 is not less than L3; a round blind hole 12 is formed in the center of the side face of the material silk thread roll 3, the round blind hole 12 is matched with the round piece 11, a square through hole 13 is formed in the bottom of the round blind hole 12, and the square through hole 13 is matched with the clamping block 10; the square through hole 13 and the round blind hole 12 formed in the wire coil 3 can be used for the winding motor 9 to pass through, and the square through hole 13 cannot be used for the round piece 11 to pass through and can block the round piece 11; a baffle 14 is installed at one end, far away from the winding motor 9, of the clamping block 10 through a screw, and the baffle 14 is used for preventing the wire coil 3 from falling off from the clamping block 10.

Specifically, the access mechanism includes an access block 15, an access passage 16 is formed in the access block 15, a pair of roller assemblies is arranged on the side wall of the access passage 16 opposite to the access passage 16, the access passage 16 is communicated with the feed passage 4 through a filament pipeline 5, a filament is accessed through the access block 15, the filament is inserted from the end of the access passage 16 far away from the filament pipeline 5, and when the filament is inserted between the pair of roller assemblies arranged on the side wall of the access passage 16, the filament is driven by the roller assemblies to move towards the filament pipeline 5 and enters the feed passage 4 formed in the printing head 2 through the filament pipeline 5.

Specifically, the roller assembly (as shown in fig. 10) includes a roller motor 17, a rotation speed sensor and a friction roller 18, the rotation speed sensor is mounted on the roller motor 17 and is used for detecting the rotation speed of the roller motor 17, the friction roller 18 is mounted at the end of an output shaft of the roller motor 17, the friction roller 18 is used for driving the material wire to move, and the roller electrode is used for driving the friction roller 18 to rotate.

Specifically, cutting mechanism includes cutting assembly and jacking subassembly, cutting assembly is used for cutting the material silk, the jacking subassembly is used for driving cutting assembly removes, can progressively cut the material silk, avoids the material silk to be too hard, or cutting assembly rusts, makes cutting assembly blocked by the material silk, causes cutting assembly to damage, can effectively improve cutting assembly life.

Further, the cutting assembly comprises a cutting motor 19, a cutting shaft 20, a pair of blades 21, a bearing and a sliding block 22, wherein a mounting groove 23 is formed in the side wall of the feeding channel 4, the mounting groove 23 is cross-shaped (as shown in fig. 9) with the cross section parallel to the bottom surface of the mounting groove 23, the cutting shaft 20 is vertically mounted in the mounting groove 23, the pair of blades 21 is arranged in the middle of the cutting shaft 20, the bearing is arranged at each of the two ends of the cutting shaft 20, the sliding block 22 is fixedly arranged on the periphery of the bearing, the two sliding blocks 22 are respectively slidably mounted at the upper part and the lower part of the mounting groove 23, the upper part and the lower part of the mounting groove 23 are matched with the sliding block, the sliding block 22 is a cuboid, the cutting motor 19 is mounted at one end of the sliding block 22 far away from the blades 21, and the lower part of the mounting groove 23 is also matched with the cutting motor 19, when slider 22 slides along the straight line in mounting groove 23, can take cutting motor 19 also to slide along the straight line in mounting groove 23, cutting motor 19 with cutting axle 20 is connected, slider 22 keeps away from one side of feedstock channel 4 with the subassembly is advanced to the top is connected, can drive cutting axle 20 through the cutting motor 19 that sets up and rotate, and then drives a pair of blade 21 and then rotates for realize the cutting to the material silk, mounting groove 23 seted up through the slider 22 cooperation that sets up, slider 22 can be along the horizontal direction in mounting groove 23 and be linear motion, slider 22 is the cuboid, and cutting axle 20 rotates and can not drive slider 22 and rotate, and slider 22 can't rotate in mounting groove 23, and the bearing is passed through at cutting axle 20 both ends and is installed on slider 22.

Further, the jacking assembly comprises ejector rods 24, connecting rods 25 and jacking cylinders 26, the ejector rods 24 are respectively arranged on one sides of the two sliding blocks 22 far away from the feeding channel 4, the two ejector rods 24 are respectively arranged along the horizontal direction, the connecting rods 25 are arranged between the two ejector rods 24, an air cylinder mounting groove 27 is arranged at the bottom of the mounting groove 23, the jacking air cylinder 26 is mounted in the air cylinder mounting groove 27, the tail end of the output shaft of the jacking cylinder 26 is fixed with the middle part of the connecting rod 25, the connecting rod 25 can be driven to move by the arranged jacking cylinder 26, and then drive ejector pin 24 and remove, ejector pin 24 drives slider 22 again and removes, takes a pair of blade 21 to remove towards the material silk that is located feedstock channel 4 at last, cuts the material silk step by step, avoids because of the material silk is too hard, or blade 21 rusts, leads to the material silk to block blade 21, damages cutting motor 19.

Further, the wire guiding mechanism comprises a guiding block 28 and a guiding cylinder 29, a guiding groove 30 is formed in a side wall of the feeding channel 4 opposite to the material returning channel 7, the guiding cylinder 29 is arranged in the guiding groove 30, the guiding block 28 is arranged at the tail end of an output shaft of the guiding cylinder 29, an arc-shaped slope 31 is formed in one end, away from the guiding cylinder 29, of the guiding block 28, the guiding groove 30 is used for installing the guiding cylinder 29 and the guiding block 28, the guiding cylinder 29 can drive the guiding block 28 to move, the feeding channel 4 can be blocked by the guiding block 28 (as shown in fig. 11), and the arc-shaped slope 31 formed in the guiding block 28 can guide the wire to bend and enter the material returning channel 7.

Furthermore, a fillet 32 is arranged at the joint of the feeding channel 4 and the material returning channel 7, so that the material wire can enter the material returning channel 7 conveniently; guide chamber 33 has been seted up to feedstock channel 4 lateral wall, guide chamber 33 is the radius platform form, the top surface of guide chamber 33 with material returned passageway 7's bottom and the bottom of guide groove 30 is at same level, when guide block 28 does not block up guide chamber 33, guide chamber 33 can guide the material silk to get into feedstock channel 4 below material returned passageway 7.

Further, the roller assemblies are arranged in the roller chambers 35, the two opposite side walls of the upper part of the feeding pipeline are respectively provided with a roller chamber 35, the opposite side walls of the access channel 16 are respectively provided with a roller chamber 35, and the side wall of the return channel 7 close to one end of the return receiving box 8 is also provided with two opposite roller chambers 35; the roller chamber 35 is internally provided with a roller motor 17, a rotation speed sensor (the rotation speed sensor is not shown in fig. 1-11) is arranged on the roller motor 17, and the tail end of an output shaft of the roller motor 17 is provided with a friction roller 18.

Further, material silk detection sensor 6 is optical sensor, and optical sensor establishes on feedstock channel 4 top lateral wall, is equipped with emitting diode 34 on feedstock channel 4 and the relative lateral wall of optical sensor, and when optical sensor department had the material silk, kept off the light that emitting diode 34 sent, and optical sensor can't detect light, can indicate that optical sensor department has the material silk, and when optical sensor department did not have the material silk, optical sensor can detect the light that emitting diode 34 sent, can indicate that optical sensor department does not have the material silk.

Further, the length of the material filament from the material filament detection sensor 6 to the blade 21 is D1, the length of the material filament from the material filament detection sensor 6 to the roller assemblies arranged in the material returning channel 7 is D2, D1 is D2, after the material filament is cut off, if the length of the material filament is greater than D1 after the material filament is cut off, the material filament can be returned, if the length of the material filament is less than D2, the length of the material filament is not enough to be returned, at this time, the material filament does not need to be cut off, and the material filament can be completely discharged from the printing head 2 by directly extruding all the material filaments by the printing head 2.

Further, the distance from the roller assembly arranged on the upper portion of the printing head 2 to the blade 21 is T1, the distance from the roller assembly arranged on the upper portion of the printing head 2 to the material returning channel 7 is T2, the distance from the blade 21 to the material returning channel 7 is T3, T2+ T3 is T1, after the filament is cut off, the roller assembly arranged on the upper portion of the printing head 2 drives the filament to move upwards for a certain distance, the distance is greater than T3 and smaller than T2, and one end, cut by the filament, can be located between the roller assembly arranged on the upper portion of the printing head 2 and the material returning channel 7.

Further, the 3D printer body 1 is further provided with a controller (the controller is not shown in fig. 1 to 11), and the controller is electrically connected with the material wire detection sensor 6, the winding motor 9, the roller motor 17, the cutting motor 19, the jacking cylinder 26, the guiding cylinder 29, the light emitting diode 34, the 3D printer body 1 and the printing head 2, and is used for controlling the material wire detection sensor 6, the winding motor 9, the roller motor 17, the cutting motor 19, the jacking cylinder 26, the guiding cylinder 29 and the light emitting diode 34, and receiving and transmitting signals.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.