阅读说明：本技术 一种3d打印换线装置 (3D prints wire replacement device ) 是由 何燕 楚电明 白文娟 于 2021-01-11 设计创作，主要内容包括：本发明实施例提供一种3D打印换线装置,用于多材料或彩色3D打印,包括打印线材、待选择打印线材、推送模块和换线模块,所述换线模块根据控制指令切断当前所述打印线材,并选择所需的所述待选择打印线材后进行熔融拼接,所述推送模块将拼接后的所述打印线材推送进打印喷头进行打印。该换线装置结构简单,有利于根据需求拼接多种颜色线材完成彩色模型的打印,同时满足不同材料的拼接,便于打印出不同性能的结构产品,利用该方法,仅需增加换线模块即可完成对当前3D打印机的改造,使其具有彩色打印、多材料打印的功能。本发明实施例解决了在先技术中针对现有3D打印机上无法快速打印价格低廉、不同色彩、不同材料性能的产品的问题。(The embodiment of the invention provides a 3D printing wire changing device which is used for multi-material or color 3D printing and comprises a printing wire, a wire to be selected and printed, a pushing module and a wire changing module, wherein the wire changing module cuts off the current printing wire according to a control instruction, the required wire to be selected and printed is selected and then fused and spliced, and the pushing module pushes the spliced printing wire to a printing nozzle for printing. This trade line device simple structure is favorable to accomplishing the printing of color model according to the multiple colour wire rod of demand concatenation, satisfies the concatenation of different materials simultaneously, is convenient for print out different performance's structure product, utilizes this method, only needs to increase and trades the line module and can accomplish the transformation to current 3D printer, makes it have the function that colored printing, many materials printed. The embodiment of the invention solves the problem that products with low price, different colors and different material properties cannot be printed quickly on the existing 3D printer in the prior art.)

1. The 3D printing wire changing device is characterized by being used for multi-material or color 3D printing and comprises a printing wire (10), a wire (20) to be printed selectively, a pushing module (30) and a wire changing module (40), wherein the printing wire (10) is inserted into the pushing module (30) and the wire changing module (40), the interface end of the wire (20) to be printed selectively is located in the wire changing module (40), and the cutting end of the printing wire (10) is connected with the interface end of one of the wires (20) to be printed selectively;

the pushing module (30) comprises a clamping unit (31) and a fixing unit (32), the printing wire (10) is positioned between a gear on the fixing unit (32) and a light wheel on the clamping unit (31), and the gear rotates to drive the printing wire (10) to complete pushing or withdrawing;

the wire changing module (40) comprises a cutting unit (41), a hot connection unit (42), a shell (43), a first power device (45), a second power device (44), a one-way locking device (46) and a connecting body (47), the printing wire (20) to be selected is nested and placed inside with respect to the unidirectional locking device (46), the printing wire (20) to be selected is unidirectionally penetrated into the wire-changing module (40) and reversely locked, the cutting unit (41) and the heat connection unit (42) are arranged inside the shell (43), and the cutting unit (41) and the thermal connection unit (42) move relative to the connection body (47), the cutting unit (41) finishes cutting the printing wire (10), the thermal connection unit (42) completes fusion splicing of the cut printing wire (10) and one of the printing wires (20) to be selected;

the wire changing module (40) cuts off the current printing wire (10) according to a control instruction, the required printing wire (20) to be selected is selected and then fused and spliced, and the pushing module (30) pushes the spliced printing wire (10) to a printing nozzle for printing.

2. 3D printing line changing device according to claim 1, wherein the cutting unit (41) and the thermal connection unit (42) move relative to the connection body (47);

the cutting unit (41) and the hot connection unit (42) are respectively connected with the output end of the second power device (44), the cutting unit (41) and the hot connection unit (42) rotate around the output end of the second power device (44), and the fixed end of the second power device (44) is fixed on the shell (43);

the cutting unit (41) and the hot connection unit (42) are respectively connected with the output end of the first power device (45) and relatively slide along the direction of the printing wire (10), and the fixed end of the first power device (45) is fixed on the shell (43);

the first power device (45) is a hydraulic cylinder, and the second power device (44) is a motor.

3. 3D printing line changer according to claim 1, characterized in that the cutting unit (41) and the thermal joining unit (42) are moved relative to the printing wire (20) to be selected;

the cutting unit (41) and the hot connection unit (42) are respectively connected with the output end of the first power device (45), the cutting unit (41) and the hot connection unit (42) slide along the direction of the printing wire (10) relative to the output end of the first power device (45), and the fixed end of the first power device (45) is fixed on the shell (43);

the connecting body (47) is connected with the output end of the second power device (44), the connecting body (47) rotates around the output end of the second power device (44), and the fixed end of the second power device (44) is fixed on the shell (43);

the first power device (45) is a hydraulic cylinder, and the second power device (44) is a motor.

4. 3D printing line changing device according to claim 1, wherein the cutting unit (41) and the thermal connection unit (42) move relative to the connection body (47);

the cutting unit (41) and the hot connection unit (42) are respectively connected with the output end of the first power device (45), the cutting unit (41) and the hot connection unit (42) slide along the direction of the printing wire (10) relative to the output end of the first power device (45), and the fixed end of the first power device (45) is fixed on the shell (43);

the connecting body (47) is connected with the output end of the second power device (44), the connecting body (47) moves horizontally relative to the output end of the second power device (44), and the fixed end of the second power device (44) is fixed on the shell (43);

the first power device (45) is a hydraulic cylinder, and the second power device (44) is a motor or a hydraulic cylinder.

5. The 3D printing line-changing device according to claim 1, wherein the number of the printing wires (20) to be selected is at least 2, and the number of the printing wires (20) to be selected is the same as that of the one-way locking devices (46);

the wire changing module (40) further comprises a joint (48), and the joint (48) and the one-way locking device (46) are respectively connected with the connecting body (47).

6. The 3D printing thread-changing device according to claim 1, characterized in that the cutting unit (41) is a pneumatic or electric scissors to cut the printing thread (20) to be selected and the printing thread (10);

the printing wire (20) to be selected has the same diameter as the printing wire (10) and is made of thermoplastic plastics, such as: PLA, ABS, PE.

7. 3D printing wire changing device according to claim 1, wherein the thermal connection unit (42) comprises a molding gripper (421), a resistance heating wire (422), a clamping power device (423) and a temperature sensor (424), the molding gripper (421) is made of a heat-conducting metal, such as: copper, iron, aluminum;

the contact part of the forming clamping hand (421) and the consumable is coated with non-stick coating, such as: teflon;

the resistance heating wire (422) provides a heat source for the forming clamp (421), and the clamping power device (423) provides clamping force to enable the forming clamp (421) to clamp the consumables to be spliced;

shaping tong (421) can be dismantled to change the model that presss from both sides tight end for the printing consumables same diameter, shaping tong (421) will dock treat to select to print wire rod (20) with print wire rod (10) melting concatenation.

8. The 3D printing line-changing device according to claim 1, wherein the pushing module (30) further comprises an optical axis (33), a shaft (34), a spring (35) and a pushing motor (36), and an output end of the pushing motor (36) is connected with the gear wheel;

one end of the clamping unit (31) is connected with the fixing unit (32) through the optical axis (33), and the clamping unit (31) rotates around the optical axis (33) relative to the fixing unit (32);

the other end of the clamping unit (32) is connected with the fixing unit (32) through the shaft (34), the spring (35) is nested outside the shaft (34), the spring (35) is positioned between the clamping unit (31) and the fixing unit (32), one end of the shaft (34) is in threaded connection with a nut, and the distance between a gear on the fixing unit (32) and a smooth wheel on the clamping unit (31) is adjusted according to the tightening condition of the nut;

the optical axis (33) is non-coplanar at 90 ° to the axis (34).

9. The 3D printing line-changing device according to claim 1, wherein the one-way locking device (46) comprises a locking shell (461), locking sheets (462) and a rotating shaft (463), the locking sheets (462) are nested in the locking shell (461), the locking sheets (462) are evenly distributed around the axis of the locking shell (461) in a circumference mode, the number of the locking sheets (462) is at least 3, and the shapes of the locking sheets (462) are the same;

one end of the locking sheet (462) is connected with the inner side of the locking shell (461) through the rotating shaft (463), and the locking sheet (462) and the end surface of the locking shell (461) form a certain angle which is larger than 0 degree and smaller than 30 degrees.

Technical Field

The invention relates to the technical field of additive manufacturing, in particular to a 3D printing wire changing device.

Background

FDM additive manufacturing (3D printing technology) has been widely used in strategic and civilian fields such as medical instruments, automobiles, rail transit, and the like, due to its mature process, low manufacturing cost, rapid product manufacturing, and the like. However, as the complexity of product structures, performance, color distribution, etc. increases, it becomes increasingly important to implement multi-material, multi-color printing.

Realize many materials at present, multicolor printing is all at home and abroad and is being beaten the printer head near-end and design in order to control multiple colour consumptive material, this scheme structure is complicated, and is with high costs, and be difficult to effectively reequip current 3D printer, this scheme is in the distal end feed point of current 3D printer, ingenious increase wire changing device, do not change other mechanical structure in order to satisfy current demand, have simple structure, the repacking is easy, advantages such as low cost, to multiple material, the realization of color printing has important meaning.

Nowadays, facing to complex situations at home and abroad, products with low price, different colors and different material performances are urgently and very necessary to be rapidly prepared, and application products of the products can play a great role in promoting the development of society.

Disclosure of Invention

The embodiment of the invention provides a 3D printing wire changing device, which aims to solve the problem that products with low price, different colors and different material properties cannot be printed quickly on the existing 3D printer in the prior art.

In order to solve the technical problem, the invention is realized as follows:

A3D printing wire changing device is used for multi-material or color 3D printing and comprises a printing wire, a to-be-selected printing wire, a pushing module and a wire changing module, wherein the printing wire is inserted into the pushing module and the wire changing module, an interface end of the to-be-selected printing wire is positioned in the wire changing module, and a shearing end of the printing wire is connected with an interface end of one of the to-be-selected printing wires;

the pushing module comprises a clamping unit and a fixing unit, the printing wire is positioned between a gear on the fixing unit and a light wheel on the clamping unit, and the gear rotates to drive the printing wire to complete pushing or withdrawing;

the wire changing module comprises a cutting unit, a hot connection unit, a shell, a first power device, a second power device, a one-way locking device and a connecting body, wherein the wire to be printed is mutually nested relative to the one-way locking device and is arranged at the inner side, the wire to be printed is unidirectionally penetrated into the wire changing module to be reversely locked, the cutting unit and the hot connection unit are arranged in the shell, the cutting unit and the hot connection unit move relative to the connecting body, the cutting unit finishes cutting the wire, and the hot connection unit finishes fusion splicing of one of the cut wire to be printed and the cut wire;

the wire changing module cuts off the current printing wire according to a control instruction, the color of the wire to be printed is selected and then fusion splicing is carried out, and the pushing module pushes the spliced printing wire to the printing nozzle for printing.

Optionally, the cutting unit and the thermal connection unit move relative to the connection body;

the cutting unit and the hot connection unit are respectively connected with the output end of the second power device, the cutting unit and the hot connection unit rotate around the output end of the second power device, and the fixed end of the second power device is fixed on the shell;

the cutting unit and the hot connection unit are respectively connected with the output end of the first power device and relatively slide along the direction of the printing wire, and the fixed end of the first power device is fixed on the shell;

the first power device is a hydraulic cylinder, and the second power device is a motor.

Optionally, the cutting unit and the hot connection unit move relative to the printing wire to be selected;

the cutting unit and the hot connection unit are respectively connected with the output end of the first power device, the cutting unit and the hot connection unit slide along the direction of the printing wire relative to the output end of the first power device, and the fixed end of the first power device is fixed on the shell;

the connecting body is connected with the output end of the second power device, the connecting body rotates around the output end of the second power device, and the fixed end of the second power device is fixed on the shell;

the first power device is a hydraulic cylinder, and the second power device is a motor.

Optionally, the cutting unit and the thermal connection unit move relative to the connection body;

the cutting unit and the hot connection unit are respectively connected with the output end of the first power device, the cutting unit and the hot connection unit slide along the direction of the printing wire relative to the output end of the first power device, and the fixed end of the first power device is fixed on the shell;

the connecting body is connected with the output end of the second power device, the connecting body horizontally moves relative to the output end of the second power device, and the fixed end of the second power device is fixed on the shell;

the first power device is a hydraulic cylinder, and the second power device is a motor or a hydraulic cylinder.

Optionally, the number of the printing wires to be selected is at least 2, and the number of the printing wires to be selected is the same as that of the unidirectional locking devices;

the wire changing module further comprises a joint, and the joint and the one-way locking device are respectively connected with the connecting body.

Optionally, the cutting unit is a pneumatic scissors or an electric scissors, and can cut the printing wire to be selected and the printing wire;

the diameter of the printing wire to be selected is the same as that of the printing wire, and the materials are thermoplastic plastics, such as: PLA, ABS, PE.

Optionally, the hot joining unit comprises a forming gripper, a resistance heating wire, a clamping power device, and a temperature sensor, and the forming gripper is made of a heat-conducting metal, such as: copper, iron, aluminum;

the contact part of the forming clamp and the consumable is coated with non-stick coating, such as: teflon;

the resistance heating wire provides a heat source for the forming clamp, and the clamping power device provides clamping force to enable the forming clamp to clamp the consumables to be spliced;

the forming clamping hand is replaced according to the diameter of the printing consumables, and the forming clamping hand is used for melting and splicing the butted printing wires to be selected and the printing wires.

Optionally, the pushing module further comprises an optical axis, a shaft, a spring, and a pushing motor, and an output end of the pushing motor is connected with the gear wheel;

one end of the clamping unit is connected with the fixing unit through the optical axis, and the clamping unit rotates around the optical axis relative to the fixing unit;

the other end of the clamping unit is connected with the fixing unit through the shaft, the spring is nested outside the shaft, the spring is positioned between the clamping unit and the fixing unit, and the clamping unit and the fixing unit are connected through the shaft

One end of the shaft is in threaded connection with a nut, and the distance between a gear on the fixing unit and a smooth wheel on the clamping unit is adjusted according to the screwing condition of the nut;

the optical axis is at 90 ° to the axis and is not coplanar.

Optionally, the one-way locking device comprises a locking shell, locking sheets and a rotating shaft, wherein the locking sheets are nested in the locking shell, the locking sheets are uniformly distributed around the axis of the locking shell in a circumferential manner, the number of the locking sheets is at least 3, and the locking sheets are identical in shape;

one end of the locking sheet is connected with the inner side of the locking shell through the rotating shaft, and the locking sheet and the end face of the locking shell form a certain angle which is larger than 0 degree and smaller than 30 degrees.

In the embodiment of the invention, the cutting unit is used for separating the current printing wire, the first power device and the second power device are matched with each other to complete the search of the required printing wire, the thermal connection unit is arranged to melt the thermoplastic material, the printing wire and the printing wire to be selected are connected together, and the pushing motor is reversely rotated and locked by the one-way locking device to realize firm splicing. This trade line device simple structure is favorable to accomplishing the printing of color model according to the multiple colour wire rod of demand concatenation, satisfies the concatenation of different materials simultaneously, is convenient for print out different performance's structure product, utilizes this method, only needs to increase and trades the line module and can accomplish the transformation to current printer, makes it have the function that colored printing, many materials printed. The embodiment of the invention solves the urgent need in the prior art for the problem that products with low price, different colors and different material properties cannot be printed quickly on the existing 3D printer.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a general schematic diagram of a first example of a 3D printing line-changing device according to an embodiment of the present invention;

fig. 2 is a schematic diagram illustrating an internal structure of an example of a 3D printing line-changing device according to an embodiment of the present invention;

fig. 3 is an overall schematic diagram of a second 3D printing line-changing device according to an embodiment of the present invention;

fig. 4 is a schematic diagram illustrating an internal structure of a second example of a 3D printing line-changing device according to an embodiment of the present invention;

fig. 5 is an overall schematic diagram of a third example of a 3D printing line-changing device according to an embodiment of the present invention;

fig. 6 is a schematic diagram illustrating an internal structure of a third example of a 3D printing line-changing device according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a one-way locking device provided by an embodiment of the invention;

description of reference numerals:

10. printing a wire; 20. selecting a printing wire; 30. a push module; 31. a clamping unit; 32. a fixing unit; 33. an optical axis; 34. a shaft; 35. a spring; 36. a pushing motor; 40. a wire changing module; 41. a cutting unit; 42. a heat bonding unit; 421. forming a clamping hand; 422. resistance heating wires; 423. clamping the power device; 424. a temperature sensor; 43. a housing; 44. a second power unit; 45. a first power unit; 46. a one-way locking device; 461. a locking shell; 462. a locking piece; 463. a rotating shaft; 47. a linker; 48. a joint;

Detailed Description

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, 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.

It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

Referring to fig. 1 to 7, an embodiment of the present invention provides a 3D printing wire changing device, which is used for multi-material or color 3D printing, and includes a printing wire 10, a to-be-selected printing wire 20, a pushing module 30, and a wire changing module 40, where the printing wire 10 is inserted into the pushing module 30 and the wire changing module 40, an interface end of the to-be-selected printing wire 20 is located in the wire changing module 40, and a cutting end of the printing wire 10 is connected to an interface end of one of the to-be-selected printing wires 20;

the pushing module 30 includes a clamping unit 31 and a fixing unit 32, the printing wire 10 is located between a gear on the fixing unit 32 and a smooth wheel on the clamping unit 31, and the gear rotates to drive the printing wire 10 to complete pushing or withdrawing;

the wire changing module 40 comprises a cutting unit 41, a hot connecting unit 42, a shell 43, a first power device 45, a second power device 44, a one-way locking device 46 and a connecting body 47, the wire 20 to be printed is nested and arranged on the inner side relative to the one-way locking device 46, the wire 20 to be printed is inserted into the wire changing module 40 in one direction and is locked in the opposite direction, the cutting unit 41 and the hot connecting unit 42 are arranged in the shell 43, the cutting unit 41 and the hot connecting unit 42 move relative to the connecting body 47, the cutting unit 41 finishes cutting the printing wire 10, and the hot connecting unit 42 finishes fusion splicing of one of the cut printing wire 10 and the wire 20 to be printed;

the wire changing module 40 cuts off the current printing wire 10 according to a control instruction, performs fusion splicing after selecting the color of the printing wire 20 to be selected, and the pushing module 30 pushes the spliced printing wire 10 to a printing nozzle for printing.

In the embodiment of the invention, the cutting unit 41 is used for separating the current printing wire, the first power device 45 and the second power device 44 are matched with each other to complete the search of the required printing wire 20 to be selected, the thermal connection unit 42 is arranged to melt the thermoplastic material and connect the printing wire 10 and the printing wire 20 to be selected together, and the pushing motor 36 rotates reversely and is locked by the one-way locking device 46 to jointly act so as to ensure that the splicing is firmer. This trade line device simple structure is favorable to accomplishing the printing of color model according to the multiple colour wire rod of demand concatenation, satisfies the concatenation of different materials simultaneously, is convenient for print out different performance's structure product, utilizes this method, only needs to increase and trades the line module and can accomplish the transformation to current 3D printer, makes it have the function that colored printing, many materials printed. The embodiment of the invention solves the urgent need in the prior art for the problem that products with low price, different colors and different material properties cannot be printed quickly on the existing 3D printer.

It should be noted that, according to the different movement forms of the cutting unit 41 and the thermal connection unit 42 relative to the connection body, the embodiment of the present invention provides three different movement forms, which are respectively the first example: the connecting body 47 is fixed, and the second power device 44 enables the cutting unit 41 and the hot connection unit 42 to rotate relative to the connecting body 47; example two: the second power device 44 rotates the connecting body 47 relative to the cutting unit 41 and the thermal connection unit 42, and the cutting unit 41 and the thermal connection unit 42 do not rotate; example three: the second power device 44 provides power to enable the connecting body 47 to move horizontally, and the cutting unit 41 and the hot connecting unit 42 do not move horizontally;

in the three examples, the first power device 45 has the same function, and both the cutting unit 41 and the hot connecting unit 42 move in the vertical direction, and the first power device 45 provides up-and-down movement power for the cutting unit 41 and the hot connecting unit 42, so that the cutting unit 41 and the hot connecting unit 42 do not collide with the printing wire 20 to be selected, and the beneficial effect of better melting the two wires during splicing is achieved.

It should be noted that the wire replacing device is located at a position of the 3D printer far away from the printing nozzle, i.e. a far-end position, if the existing 3D printer is additionally provided with a color printing function, the wire replacing module 40 is only needed without adding a push module according to needs, because the existing 3D printer has push modules with different structures at the near-end;

it should be noted that there exists a section of printing wire between the printing outlet position and the replacement wire, the time of printing the wire is the time before the printing product needs to change color or material, and the time difference is a constant value.

The embodiment of the invention is directed to an FDM 3D printing process, wherein the FDM process is a fused deposition manufacturing process, printing consumables are thermoplastic plastics, and the fused deposition manufacturing process is a process for forming a solid body layer by fusing thermoplastic wires, assisting in computer control, printing at a nozzle, and cooling deposition;

it should be noted that the printing wire 10 and the printing wire 20 to be selected are both printing consumables, and both may be in different colors or different materials;

it should be noted that the printing wire 10 passes through the unidirectional locking device 46, and enters the printing head for printing through the pushing module 30, in the wire changing module 40, the cutting unit 41 cuts the printing wire, the upper end of the cut-off opening is the cut-off end of the printing wire 10, the lower end of the cut-off opening becomes the interface end of the printing wire 20 to be selected, the printing wires to be selected of different colors or different materials are inserted into the remaining unidirectional locking devices 46, until the cutting opening and the cut-off opening are in the same horizontal plane, and the end of the printing wire 20 to be selected inserted into the wire changing module 40 is called the interface end. Similarly, the consumable materials on the pushing module 30 and the printing wire 20 to be selected are fused and spliced to form a new printing wire 10;

it should be noted that the housing 43 includes a fixed portion for fixing to the 3D printer and a detachable portion for detaching for maintenance;

alternatively, in the embodiment of the present invention, the cutting unit 41 and the thermal connection unit 42 move relative to the connection body 47;

the cutting unit 41 and the hot connecting unit 42 are respectively connected with the output end of the second power device 44, and the cutting unit 41 and the hot connecting unit 42 rotate around the output end of the second power device 44, and the fixed end of the second power device 44 is fixed on the shell 43;

the cutting unit 41 and the thermal connection unit 42 are respectively connected with the output end of the first power device 45 and relatively slide along the direction of the printing wire 10, and the fixed end of the first power device 45 is fixed on the shell 43;

the first power device 45 is a hydraulic cylinder, and the second power device 44 is a motor.

In the embodiment of the present invention, which is the first case of the 3D printing line changing device, in this example, the second power device 44 provides a rotation power source for the cutting unit 41 and the hot connecting unit 42, and the first power device 45 provides a vertical sliding power source for the cutting unit 41 and the hot connecting unit 42, which is beneficial to more flexible movement of the cutting unit 41 and the hot connecting unit 42, better firmness of the shell 43, and better sealing performance;

optionally, in the embodiment of the present invention, the cutting unit 41 and the thermal connection unit 42 move relative to the printing wire 20 to be selected;

the cutting unit 41 and the hot connecting unit 42 are respectively connected with the output end of the first power device 45, the cutting unit 41 and the hot connecting unit 42 slide along the direction of the printing wire 10 relative to the output end of the first power device 45, and the fixed end of the first power device 45 is fixed on the shell 43;

the connecting body 47 is connected with the output end of the second power device 44, the connecting body 47 rotates around the output end of the second power device 44, and the fixed end of the second power device 44 is fixed on the shell 43;

the first power device 45 is a hydraulic cylinder, and the second power device 44 is a motor.

In the embodiment of the present invention, which is a second case of the 3D printing wire replacing device, in this example, the second power device 44 provides a rotation power source for the connecting body 47, the connecting body 47 drives the one-way locking device 46 and the printing wire 20 to be selected to rotate together, and the first power device 45 provides a vertical sliding power source for the cutting unit 41 and the thermal connection unit 42, which is beneficial to accurately splicing the printing wire 10 and the printing wire 20 to be selected, and is beneficial to keeping the structure compact and small;

alternatively, in the embodiment of the present invention, the cutting unit 41 and the thermal connection unit 42 move relative to the connection body 47;

the cutting unit 41 and the hot connecting unit 42 are respectively connected with the output end of the first power device 45, the cutting unit 41 and the hot connecting unit 42 slide along the direction of the printing wire 10 relative to the output end of the first power device 45, and the fixed end of the first power device 45 is fixed on the shell 43;

the connecting body 47 is connected with the output end of the second power device 44, the connecting body 47 moves horizontally relative to the output end of the second power device 44, and the fixed end of the second power device 44 is fixed on the shell 43;

the first power device 45 is a hydraulic cylinder, and the second power device 44 is a motor or a hydraulic cylinder.

In the embodiment of the present invention, the example is a third case of a 3D printing wire replacing device, in the example, the second power device 44 provides a horizontal moving power source for the connecting body 47, the connecting body 47 drives the one-way locking device 46 and the wire 20 to be selected for printing to move horizontally together, and the first power device 45 provides a vertical sliding power source for the cutting unit 41 and the hot joining unit 42, so as to provide a beneficial effect on accurate splicing between the printing wire 10 and the wire 20 to be selected for printing and structural stability;

optionally, in the embodiment of the present invention, the number of the printing wires 20 to be selected is at least 2, and the number of the printing wires 20 to be selected is the same as the number of the unidirectional locking devices 46;

the wire changing module 40 further comprises a joint 48, and the joint 48 and the one-way locking device 46 are respectively connected with the connecting body 47.

In the embodiment of the present invention, the printing wires 20 to be selected are provided as a plurality of wires, each of which passes through a set of unidirectional locking devices 46, and can be set as required, at least 2 wires, and the embodiment illustrates 3 printing wires 20 to be selected;

optionally, in an embodiment of the present invention, the cutting unit 41 is a pneumatic scissors or an electric scissors, and can cut the printing wire 20 to be selected and the printing wire 10;

the printing wire 20 to be selected has the same diameter as the printing wire 10 and is made of thermoplastic plastics, such as: PLA, ABS, PE.

In the embodiment of the invention, the diameter of the printing wire 20 to be selected is the same as that of the printing wire 10, which is beneficial to ensuring the stability of the printing speed, and the diameters of the two wires are different, so that the adaptive forming clamp (421) needs to be replaced, and the two wires can be made of different materials, which is beneficial to printing products with different performances;

it should be noted that, if the two wires are made of different materials, the melting temperature and the printing temperature at the printing nozzle need to be adjusted;

optionally, in an embodiment of the present invention, the thermal connection unit 42 includes a molding gripper 421, a resistance heating wire 422, a clamping power device 423, and a temperature sensor 424, where the molding gripper 421 is made of a heat-conductive metal, for example: copper, iron, aluminum;

the contact part of the forming clamp 421 and the consumable is coated with a non-stick coating, for example: teflon;

the resistance heating wire 422 provides a heat source for the forming clamp 421, and the clamping power device 423 provides clamping force to enable the forming clamp 421 to clamp the consumables to be spliced;

the forming clamp 421 is replaced according to the diameter of the printing consumable, and the forming clamp 421 is used for fusion splicing of the to-be-selected printing wire 20 and the printing wire 10.

In the embodiment of the present invention, the molding gripper 421 is made of a heat conductive metal to facilitate rapid temperature rise, the temperature sensor 424 senses and collects the temperature of the molding gripper 421, when the set temperature is reached, the resistance heating wire 422 stops being powered on, the temperature is kept constant in the molten splicing state, and after the splicing is completed, the molding gripper can be naturally cooled or a fan is added to rapidly cool, and the latter is preferred in this embodiment.

It should be noted that the contact portion of the forming gripper 421 and the consumable material is coated with the non-stick coating, so that the forming gripper 421 keeps smooth and non-stick after fusion splicing, and the splicing quality is good, thereby having beneficial effects.

It should be noted that, under the action of the clamping power device 423, the forming gripper 421 clamps the two wires to be spliced together, and can keep continuously clamping to maintain the temperature constant, and also can select intermittent and repetitive actions of clamping and loosening, and in addition, the first power device 45 moves the forming gripper up and down to ensure good connection quality at the connection position, and the latter is preferred in this embodiment;

optionally, the pushing module 30 further includes an optical axis 33, a shaft 34, a spring 35, and a pushing motor 36, and an output end of the pushing motor 36 is connected to the gear wheel;

one end of the clamping unit 31 is connected with the fixing unit 32 through the optical axis 33, and the clamping unit 31 rotates around the optical axis 33 relative to the fixing unit 32;

the other end of the clamping unit 32 is connected with the fixing unit 32 through the shaft 34, the spring 35 is nested outside the shaft 34, the spring 35 is positioned between the clamping unit 31 and the fixing unit 32, one end of the shaft 34 is in threaded connection with a nut, and the distance between a gear on the fixing unit 32 and a smooth wheel on the clamping unit 31 is adjusted according to the tightening condition of the nut;

the optical axis 33 is at 90 deg. to the axis 34 and is not coplanar.

In the embodiment of the present invention, the pushing module 30 is simple in structure and is beneficial to reducing the cost.

Optionally, in the embodiment of the present invention, the one-way locking device 46 includes a locking shell 461, a locking plate 462, and a rotating shaft 463, the locking plate 462 is nested inside the locking shell 461, the locking plate 462 is evenly distributed around the axis of the locking shell 461 in a circumferential direction, and the locking plate 462 has at least 3 pieces and has the same shape;

one end of the locking tab 462 is connected to the inner side of the locking shell 461 through the rotating shaft 463, and the locking tab 462 forms an angle with the end surface of the locking shell 461, the angle being greater than 0 ° and smaller than 30 °.

In the embodiment of the invention, the arrangement of the one-way locking device 46 is beneficial to fixing the printing wire to be selected and preventing the printing wire from falling off, and the invention of the one-way locking device 46 has the advantages of simple structure and low cost.

It should be noted that, in the present embodiment, the unidirectional locking device 46 inserts the printing wire 20 to be selected into the wire changing module 40 in a unidirectional manner, and locks in a reverse direction, and cooperates with the pushing motor 36 in the pushing module 30 to complete the tight butt joint of the printing wire 20 to be selected and the printing wire 10, which has a beneficial effect on the tight quality of the butt joint.

The working principle and the working process of the invention are as follows:

firstly, the printing wire 10 passes through the wire changing module 40, passes through the pushing module 30 and is connected with the 3D printing head;

the other joints 48 and the one-way locking device 46 are inserted into the printing wires 20 to be selected with different colors, and the depth of the insertion of the wire changing module 40 and the position of the scissors of the cutting unit 41 keep the same horizontal plane;

calculating the printing completion time of the consumable according to the length and the printing speed from the cut position of the scissors to the discharge port position of the printer, wherein t1 is assumed;

opening the resistance heating wire 422 to make the forming clamp 421 rise to the set temperature and maintain the constant;

opening the 3D printer and starting printing;

according to the setting of a model program, if the material or the color of the material needs to be changed after t1 seconds, the 3D printer suspends printing, the first power device 45 enables the cutting unit 41 to quickly reach a preset cutting position, and the printing wire 10 is cut;

the second power device 44 is opened, and under the combined action of the first power device 45 and the second power device 44, the cutting end of the printing wire 10 and the thermal connection unit 42 reach the required interface end position of the printing wire 20 to be selected;

the molding clamp 421 clamps the wire connecting port to make it rapidly in a semi-molten state, then the molding clamp 421 exhibits repeated actions of clamping and loosening under the action of the clamping power device 423, meanwhile, the molding clamp 421 slowly rises and falls under the action of the first power device 45 to repeat actions, and after splicing is completed, the molding clamp 421 is opened;

continuing printing by the 3D printer;

repeating the shearing-melting splicing process according to the model printing progress until the model printing is finished, wherein a time difference of t1 seconds exists between the color to be printed and the line changing completion;

after printing, the printed product is a color 3D printed product according to setting, or a 3D printed product with different material performances.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.