A multi-mode 3D printer head and a collaborative printing method using the same

Abstract

A multi-mode 3D printer head includes a head body, the head body is provided with a vertical extrusion hole, and a feeding mechanism is provided above the extrusion hole, and a heating mechanism is provided below the extrusion hole; the head body is provided with a plurality of droplet injection holes circumferentially along the central axis of the extrusion hole; the head body is also provided with a plurality of droplet addition holes and auxiliary side holes connected to the droplet injection holes; the droplet addition holes are connected with droplet addition tubes for adding droplets; the auxiliary side holes are connected with injection auxiliary parts; the injection auxiliary parts can intercept droplets entering the droplet injection holes from the droplet addition holes, and can also realize pressurized injection of the droplet injection holes at a preset position. Different from the setting mode of the existing structure, this device can switch between extrusion molding printing and droplet injection printing states. Therefore, it is not necessary to frequently adjust the head position over a large range according to the material, and in view of this, a collaborative printing method is also provided to complete composite material printing.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing equipment, and in particular to a multi-mode 3D printer head and a collaborative printing method using the same. Background Art

[0002] 3D printing is a type of rapid prototyping technology. It is a technology that uses digital model files as the basis and uses bonded profile materials such as powdered metal or plastic to construct objects by printing layer by layer.

[0003] However, due to the different properties of profile materials, existing 3D printers are mainly divided into extrusion molding or droplet injection according to the requirements of different profile materials for discharge methods. This results in the need to set up corresponding multiple 3D printer heads for 3D printers to print composite materials. When running the printing program, different print heads need to be replaced. Therefore, the position of the 3D printer head needs to be frequently adjusted to be able to use the corresponding material, which greatly affects the printing efficiency. Summary of the invention

[0004] In order to solve the problem that printing composite materials requires multiple heads to be frequently adjusted, which affects printing efficiency, the present invention provides a multi-mode 3D printer head and a collaborative printing method using the same.

[0005] The technical solution of the present invention is as follows:

[0006] A multi-mode 3D printer head, comprising a head body, wherein the head body is provided with a vertical extrusion hole, a feeding mechanism is provided above the extrusion hole, and a heating mechanism is provided below the extrusion hole;

[0007] The die body is provided with a plurality of liquid droplet injection holes circumferentially along the central axis of the extrusion hole;

[0008] The lower end of the droplet injection hole is inclined toward one end of the extrusion hole, and the lower ends of the plurality of droplet injection holes are flush with the lower end of the extrusion hole;

[0009] The droplet injection holes are provided in an even number and are symmetrically arranged in pairs with respect to the extrusion hole;

[0010] There is an intersection point on the straight lines where the central axes of the plurality of droplet injection holes are located, and the intersection point is located directly below the extrusion hole;

[0011] The head body is also provided with a plurality of droplet adding holes and auxiliary side holes connected to the droplet injection holes;

[0012] The inner diameter of the droplet adding hole is larger than the droplet ejecting hole, and the end away from the droplet ejecting hole is connected to the droplet adding pipe;

[0013] The auxiliary side hole is arranged perpendicular to the droplet adding hole and is detachably connected with a spray auxiliary part;

[0014] The spray auxiliary component includes a sleeve fixed to the auxiliary side hole, a movable block is arranged in the sleeve, the outer surface of the movable block is in close contact with the inner wall of the sleeve in the circumferential direction, and the end close to the auxiliary side hole can cut off the droplet addition hole;

[0015] The moving block is also provided with an auxiliary spray hole, and the two openings of the auxiliary spray hole are respectively arranged toward the droplet spray hole and away from the auxiliary side hole;

[0016] One end of the sleeve away from the auxiliary side hole is connected with an air pipe and is provided with an induction coil.

[0017] Different from the setting method of the existing structure, this device can perform extrusion molding printing on some materials through the feeding mechanism and the extrusion hole, and can also complete the droplet jet printing of other materials through the injection auxiliary parts and the droplet injection hole. The adjustment process can be completed only by moving the height of the head body, so the printing efficiency is higher than the existing structure.

[0018] In order to actuate the droplets in the droplet adding hole, the auxiliary nozzle hole can be connected to the droplet injection hole when the moving block cuts off the droplet adding hole. Since one end of the auxiliary nozzle hole is connected to the air pipe, when the air pipe is pressurized, the air flow can be ejected from the other opening of the auxiliary nozzle hole.

[0019] In order to increase the jet pressure, the inner diameter of the auxiliary jet hole is larger than the droplet jet hole, and the opening close to the droplet jet hole is a bell mouth. The bell mouth can prevent the droplet from flowing back during jetting.

[0020] In order to realize the collection of droplets and prevent the accumulation of droplets, the connecting section between the droplet adding hole and the droplet spraying hole is a conical section. The droplets can enter the droplet spraying hole along with the air flow and then be sprayed out.

[0021] In order to prevent the droplets from entering the sleeve of the spray auxiliary part, the diameter of the droplet addition hole is larger than the diameter of the droplet spray hole, and the inclination angle of the tapered section is 0°-45°. After the droplets are added from the droplet addition hole, they can accurately enter the droplet spray hole.

[0022] In order to prevent the moving block from affecting the amount of droplets added into the droplet injection hole, the induction coil can adsorb the moving block after being energized, and the adsorbed moving block can be away from the droplet addition hole.

[0023] The specific method for installing the above-mentioned heating mechanism is that a ring groove is provided on the side of the head body away from the feeding mechanism, the ring groove is located between the extrusion hole and the droplet injection hole, and the heating mechanism is provided.

[0024] The specific structure of the above-mentioned feeding mechanism is that the feeding mechanism includes a connecting frame detachably connected to the head body, and the connecting frame is relatively provided with a driving wheel and a driven wheel for transporting vertical profiles above the extrusion hole, and the distance between the driven wheel and the driving wheel can be adjusted.

[0025] The specific structure of the above-mentioned spray auxiliary part is that the spray auxiliary part includes a cylindrical sleeve, and the sleeve is provided with a rectangular hole along the length direction, the width of the rectangular hole is the same as the diameter length of the liquid addition hole, the moving block can move in the rectangular hole, and the moving block includes a rectangular section and a semicircular section, the rectangular section is tightly attached to the rectangular hole circumferentially, the diameter of the semicircular section is the same as the width of the rectangular hole, and the semicircular section can be inserted into the liquid addition hole from the side and cut off the droplet addition hole. Among them, the design of the rectangular section can avoid rotation during the movement, ensure that the outlet of the auxiliary spray hole is vertically downward, provide aerodynamic force for the liquid spray hole, and spray droplets, while the semicircular section can cut off the droplet addition hole to avoid droplet backflow.

[0026] A multi-mode 3D printer head collaborative printing method uses the above-mentioned multi-mode 3D printer head and includes the following steps:

[0027] S1. The software virtual printing platform obtains the 3D model and profile material to be printed;

[0028] S2, the software slices the three-dimensional model to obtain the slices of the model to be printed;

[0029] S3, the software performs overall planning based on the number of printed profile materials and the size of the three-dimensional model, obtains the droplet jet printing program segment and the extrusion molding printing program segment, and transmits them to the controller;

[0030] S4, the controller runs the droplet jet printing program segment and the extrusion molding printing program segment in sequence, and a compensation program is set between the droplet jet printing program segment and the extrusion molding printing program segment;

[0031] S5. Complete the printing work.

[0032] By setting a compensation program, it is possible to avoid misalignment of the printing positions of the droplet jet printing program segment and the extrusion molding printing program segment.

[0033] The compensation program is implemented in such a way that the compensation program includes a height adjustment program, and the height adjustment dimension of the height adjustment program is the same as the spacing dimension between the lower end of the extrusion hole and the intersection of the plurality of droplet ejection holes. The device only needs to be adjusted according to the specific print position height difference to ensure the synchronization of the print position, and the adjustment range does not need to be calculated, and the printing efficiency is extremely high.

[0034] The beneficial effects of the present invention are as follows: the present invention is a multi-mode 3D printer head and a collaborative printing method using the same. Different from the existing structure, only one 3D printer head is required to complete the printing of composite materials, and according to the actual profile, it is possible to switch between extrusion molding and droplet injection printing methods. Moreover, according to the difference in the above printing methods, it is only necessary to adjust the 3D printer head to the corresponding preset height. Moreover, when the above structure is in use, the magnetic force of the induction coil or the air pressure of the air pipe can be adjusted according to the needs, thereby realizing the control of the amount of droplet addition, which can significantly improve the printing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] By reading the detailed description of the preferred embodiment below, the scheme and advantages of the present application will become clear to those skilled in the art. The accompanying drawings are only for the purpose of illustrating the preferred embodiment and are not to be considered as limiting the present invention.

[0036] In the attached picture:

[0037] Figure 1 It is a schematic diagram of the cross-sectional structure of part of the structure of the present invention (droplet adding state);

[0038] Figure 2 It is a schematic diagram of the partial structural cross-section of the present invention (droplet spraying state);

[0039] Figure 3 It is a schematic diagram of the cross-sectional structure of the main body of the machine head of the present invention;

[0040] Figure 4 It is a schematic diagram of the cross-sectional structure of the spray auxiliary component of the present invention (droplet adding state);

[0041] Figure 5 It is a schematic diagram of the cross-sectional structure of the spray auxiliary component of the present invention (liquid droplet spraying state);

[0042] Figure 6 It is a schematic diagram of the top view structure of the present invention;

[0043] Figure 7 It is a bottom view structural schematic diagram of the present invention;

[0044] Figure 8 It is a schematic diagram of the main structure of the machine head of the present invention;

[0045] Fig. 9 It is a schematic diagram of the structure of the present invention;

[0046] The components represented by the reference numerals in the figure are:

[0047] 1. Head body; 11. Extrusion hole; 12. Droplet adding hole; 13. Droplet injection hole; 14. Auxiliary side hole; 15. Ring groove; 2. Injection auxiliary part; 21. Sleeve; 22. Induction coil; 23. Moving block; 24. Auxiliary injection hole; 25. Bell mouth; 3. Connecting piece; 4. Air pipe; 5. Droplet adding seat; 6. Droplet adding tube; 7. Feeding mechanism; 71. Connecting frame; 72. Driving wheel; 73. Driven wheel; 8. Profile. DETAILED DESCRIPTION

[0048] like Fig. 9 A multi-mode 3D printer head is shown, comprising Figure 3 , 8 The head body 1 shown in the figure is provided with a vertical extrusion hole 11, and the extrusion hole 11 is arranged at the center position of the head body 1. It is only necessary to add the profile 8 into the extrusion hole 11 and heat and melt the profile 8, and then the material can be discharged from the lower end of the extrusion hole 11. It is only necessary to set a corresponding cooling structure to shape the melted profile 8 and realize extrusion molding printing.

[0049] For this purpose, the specific design method is as follows: Fig. 9 As shown, a feeding mechanism 7 is arranged above the extrusion hole 11, and the specific structure of the feeding mechanism 7 is that the feeding mechanism 7 includes a connecting frame 71 detachably connected to the head body 1, and the connection method is that the top end of the head body 1 is arranged with an external thread, and the connecting frame 71 is arranged with an internal thread, and fixation can be achieved by matching the internal and external threads. Afterwards, the connecting frame 71 is relatively arranged with a driving wheel 72 and a driven wheel 73 for transporting the vertical profile 8 above the extrusion hole 11, and the spacing of the driven wheel 73 relative to the driving wheel 72 can be adjusted, and can be adjusted according to the diameter of the profile 8, and the driven wheel 73 can tighten the row of profiles 8 and transport the profiles 8 downward, and the discharge can be achieved by continuously adding the profiles 8 to the extrusion hole 11.

[0050] And the way of setting the heating mechanism in the above structure is that an annular groove 15 is provided on the side of the head body 1 away from the feeding mechanism 7, and the annular groove 15 is located between the extrusion hole 11 and the droplet injection hole 13, and a heating mechanism is provided. The heating mechanism is a heating wire, and the heating wire is arranged in an annular shape and buried in the annular groove 15, so the heat preservation effect is better, and the setting position of the above-mentioned annular groove 15 can heat the droplets at the same time if there is a need.

[0051] In order to achieve droplet jet printing on the same head, such as Figure 1 , 2 As shown in FIGS. 6 and 7 , the die body 1 is provided with a plurality of liquid droplet injection holes 13 circumferentially along the central axis of the extrusion hole 11 .

[0052] It should be noted that the lower end of the droplet injection hole 13 is inclined toward one end of the extrusion hole 11. The purpose of the inclined setting is to enable the droplets to be sprayed below the extrusion hole 11 when the droplets are ejected, and in order to avoid the problem of collision with the printed structure during movement, the lower ends of the plurality of droplet injection holes 13 are flush with the lower end of the extrusion hole 11, so that the influence of the droplet injection holes 13 can be avoided while the extrusion molding printing process is carried out normally.

[0053] In the above structure, the droplet injection holes 13 need to spray the droplets through airflow. In order to avoid the droplets being sprayed to a place away from the preset position, the droplet injection holes 13 are arranged in an even number, and are symmetrically arranged in pairs with respect to the extrusion hole 11. Through the interaction of airflow, the droplets can be accurately sprayed to the preset position and printed into shape.

[0054] In order to accurately locate the above-mentioned preset position, on the basis of the above-mentioned structure, further, there is an intersection point on the straight lines where the central axes of the plurality of droplet injection holes 13 are located, and the intersection point is located directly below the extrusion hole 11, and on the straight line where the central axis of the extrusion hole 11 is located. Therefore, the injection position and the extrusion position of the extrusion hole 11 differ only in the vertical direction, and there is no difference in the horizontal and longitudinal directions. When in use, it is only necessary to adjust the height of the head body 1.

[0055] The specific method is that when switching from the extrusion molding printing program to the droplet jet printing program, the above-mentioned head body 1 needs to be lifted, and the dimension of the lifting height is the distance dimension between the lower end opening of the extrusion hole 11 and the intersection. Conversely, when the droplet jet printing program is switched to the extrusion molding printing program, the height of the head body 1 needs to be lowered, and the dimension of the height reduction is the same as the dimension of the above-mentioned lifting height.

[0056] The droplet injection cannot be completed only through the above-mentioned droplet injection hole 13, and a droplet adding structure and an injection mechanism need to be set up. Specifically, the head body 1 is also provided with a plurality of droplet adding holes 12 and auxiliary side holes 14 connected to the droplet injection hole 13.

[0057] Among them, the inner diameter of the droplet addition hole 12 is larger than the droplet injection hole 13, so that normal addition of droplets can be completed, and on the basis of the above structure, the jet mechanism can be connected to drive the injection, and, in order to achieve droplet addition, the end of the droplet addition hole 12 away from the droplet injection hole 13 is connected to the droplet addition tube 6, and, in order to achieve quantitative addition, a droplet addition seat 5 is also provided between the droplet addition tube 6 and the droplet addition hole 12.

[0058] After the above-mentioned droplet addition is achieved, the jet mechanism can be designed, and the specific method is that the auxiliary side hole 14 is arranged perpendicular to the droplet addition hole 12, and is detachably connected with the jet auxiliary part 2, and the jet auxiliary part 2 can also be perpendicular to the droplet addition hole 12 after connection.

[0059] And if Figure 4 , 5 As shown, the injection auxiliary component 2 includes a sleeve 21 fixed to the auxiliary side hole 14, the sleeve 21 is a cylindrical structure, and a movable block 23 is arranged in the sleeve 21. After the movable block 23 moves, it can be used to cut off the above-mentioned droplet addition hole 12, and in order to avoid droplets from leaking from the gap, the outer surface of the movable block 23 is circumferentially tightly attached to the inner wall of the sleeve 21 to ensure a sealed connection between each other, and no droplets or gas leakage will occur. In order to drive the droplets in the droplet injection hole 13 to be ejected after cutting off the above-mentioned droplet addition hole 12, for this purpose, the movable block 23 is also provided with an auxiliary spray hole 24, and the two openings of the auxiliary spray hole 24 are respectively arranged toward the droplet injection hole 13 and away from the auxiliary side hole 14, and the airflow can pass through the two openings.

[0060] It should be noted that the specific structure of the above-mentioned injection auxiliary part 2 is that the injection auxiliary part 2 includes a cylindrical sleeve 21, and the sleeve 21 is provided with a rectangular hole along the length direction, the width of the rectangular hole is the same as the diameter length of the liquid addition hole, the moving block 23 can move in the rectangular hole, and the moving block 23 includes a rectangular segment and a semicircular segment, the rectangular segment is tightly attached to the rectangular hole circumferentially, the diameter of the semicircular segment is the same as the width of the rectangular hole, and the semicircular segment can be inserted into the liquid addition hole from the side and cut off the droplet addition hole 12. Among them, the design of the rectangular segment can avoid rotation during the movement, ensure that the outlet of the auxiliary spray hole 24 is vertically downward, provide aerodynamic force for the liquid spray hole, and spray the droplets, while the semicircular segment can cut off the droplet addition hole 12 to avoid droplet backflow.

[0061] In order to realize jet drive, such as Fig. 9 As shown, in order to realize the actuation of the droplets in the droplet adding hole 12, the auxiliary nozzle hole 24 can be connected with the droplet injection hole 13 when the moving block 23 cuts off the droplet adding hole 12. Since one end of the auxiliary nozzle hole 24 is connected to the air pipe 4, when the air pipe 4 is pressurized, the air flow can be ejected from the other opening of the auxiliary nozzle hole 24.

[0062] And the specific implementation method is that the end of the sleeve 21 away from the auxiliary side hole 14 is connected to the air pipe 4, and the end of the air pipe 4 away from the sleeve 21 is connected to the air compressor for providing injection power. When in use, after the airflow of the air compressor enters the sleeve 21, when the opening of the auxiliary side hole 14 toward the droplet injection hole 13 is blocked by the sleeve 21, the airflow can push the moving block 23 to move, and after moving, it can resist the surface of the droplet adding hole 12 to cut it off, and at this time, the opening of the auxiliary side hole 14 away from the auxiliary side hole 14 can be connected to the droplet injection hole 13, and after the airflow enters from one end opening, it can be discharged from this opening to realize injection, and during the injection process, the droplets can be carried out to realize droplet injection printing.

[0063] Afterwards, in order to realize the addition of droplets in the subsequent process, the end of the sleeve 21 away from the droplet addition hole 12 is provided with an induction coil 22, and the induction coil 22 can adsorb the moving block 23 after being energized, and the adsorbed moving block 23 can be away from the droplet addition hole 12. Then, the droplets can flow from the droplet addition hole 12 into the droplet injection hole 13, and by switching the above states, periodic droplet injection printing can be realized.

[0064] Through the above structure, it can be realized that, different from the setting method of the existing structure, the present device can perform extrusion molding printing on some materials through the feeding mechanism 7 in cooperation with the extrusion hole 11, and can also complete the droplet jet printing of other materials through the injection auxiliary part 2 in cooperation with the droplet injection hole 13, and the adjustment process can be completed only by moving the height of the head body 1, so the printing efficiency is higher than that of the existing structure.

[0065] Then, in addition to the above structure, in order to increase the jet pressure, the inner diameter of the auxiliary jet hole 24 is larger than the droplet jet hole, and the opening close to the droplet jet hole 13 is a bell mouth 25. The setting of the bell mouth 25 can prevent the droplets from flowing back during jetting. The setting of the bell mouth 25 can prevent the droplets from being jetted to the corner and unable to be jetted normally from the droplet jet hole 13.

[0066] At the same time, in order to achieve the collection of droplets and prevent the accumulation of droplets, the connection section between the droplet addition hole 12 and the droplet injection hole 13 is a tapered section. The droplets can enter the droplet injection hole 13 with the airflow and then be ejected. When processing the head body 1, the upper half of the liquid addition hole 12 can be processed by a circular drill bit, and then the liquid injection hole 13 can be processed by a circular drill bit with a smaller diameter. The two are not connected at this time, and then the lower half of the liquid addition hole 12 can be processed by a tapered drill bit and connected to the liquid injection hole 13.

[0067] Finally, in order to prevent the droplets from entering the sleeve 21 of the spraying auxiliary member 2, the droplet adding hole 12 is tilted toward the extrusion hole 11 at one end away from the droplet spraying hole, and the tilt angle is 0°-45°. After the droplets are added from the droplet adding hole 12, they can accurately enter the droplet spraying hole 13.

[0068] A multi-mode 3D printer head collaborative printing method uses the above-mentioned multi-mode 3D printer head and includes the following steps:

[0069] S1, the software virtual printing platform obtains the three-dimensional model and profile 8 material to be printed;

[0070] S2, the software slices the three-dimensional model to obtain the slices of the model to be printed;

[0071] S3, the software performs overall planning by printing the material quantity of the profile 8 and the size of the three-dimensional model, obtains the droplet jet printing program segment and the extrusion molding printing program segment, and transmits them to the controller;

[0072] S4, the controller runs the droplet jet printing program segment and the extrusion molding printing program segment in sequence, and a compensation program is set between the droplet jet printing program segment and the extrusion molding printing program segment;

[0073] S5. Complete the printing work.

[0074] By setting a compensation program, it is possible to avoid misalignment of the printing positions of the droplet jet printing program segment and the extrusion molding printing program segment.

[0075] The droplet jet printing program segment can control the air supply mechanism at the end of the air pipe 4 away from the connecting piece 3, and can also control the liquid supply mechanism at the end of the droplet adding tube 6 away from the droplet adding seat 5 and the power supply mechanism of the induction coil 22. When the program is running, the liquid supply mechanism is controlled to supply liquid through the droplet adding tube 6 to ensure that the droplets enter the lower end of the droplet adding hole 12, and then the air supply mechanism is controlled to supply air. After that, under the action of the airflow, the moving block 23 moves quickly and pushes to the inner wall of the droplet adding hole 12 to push the droplets. The airflow is cut off, and can continue to flow out from the outlet of the auxiliary nozzle 24, and carry droplets to be sprayed out from the droplet injection hole 13. Moreover, in the above structure, droplets from multiple droplet injection holes 13 can be sprayed at the same position. Afterwards, the air supply mechanism is closed, the power supply mechanism is turned on, and the induction coil 22 is controlled to adsorb the moving block 23. Therefore, the moving block 23 must be made of magnetic material, and other structures such as the sleeve 21 are made of non-magnetic materials. Afterwards, the power supply and air supply mechanism are cyclically turned on to complete the droplet jet printing.

[0076] The extrusion molding printing program segment only needs to control the feeding mechanism 7 and the heating mechanism in the annular groove 15, and continuously heat and control the feeding mechanism 7 to continuously add the profile 8, so that the profile 8 can be 3D printed from the bottom of the extrusion hole 11. In order to speed up the molding of the profile 8, a cooling mechanism can also be set from the side.

[0077] It can be seen from the above printing program segment that there is a height difference between the printing positions of droplet jet printing and extrusion molding printing. Therefore, the setting of the above compensation program is necessary.

[0078] The compensation program is implemented in such a way that the compensation program includes a height adjustment program, and the adjustment height dimension of the height adjustment program is the same as the spacing dimension between the lower end of the extrusion hole 11 and the intersection of the plurality of droplet injection holes 13. The device only needs to be adjusted according to the specific printing position height difference to ensure the synchronization of the printing position, and the adjustment range does not need to be calculated, and the printing efficiency is extremely high.

Claims

1. A multi-mode 3D printer head, characterized in that: It comprises a die body (1), the die body (1) being provided with a vertical extrusion hole (11), a feeding mechanism (7) being provided above the extrusion hole (11), and a heating mechanism being provided below the extrusion hole (11); The die body (1) is provided with a plurality of liquid droplet injection holes (13) along the circumferential direction of the central axis of the extrusion hole (11); The lower end of the liquid droplet injection hole (13) is arranged to be inclined toward one end of the extrusion hole (11), and the lower ends of the plurality of liquid droplet injection holes (13) are flush with the lower end of the extrusion hole (11); The droplet injection holes (13) are provided in an even number and are symmetrically arranged in pairs with respect to the extrusion hole (11); There is an intersection point on the straight lines where the central axes of the plurality of droplet injection holes (13) are located, and the intersection point is located directly below the extrusion hole (11); The head body (1) is also provided with a plurality of droplet adding holes (12) and auxiliary side holes (14) which are connected to the droplet injection holes (13); The inner diameter of the liquid droplet addition hole (12) is larger than that of the liquid droplet injection hole (13), and one end away from the liquid droplet injection hole (13) is connected to a liquid droplet addition pipe (6); The auxiliary side hole (14) is arranged perpendicular to the droplet adding hole (12) and is detachably connected to the spray auxiliary component (2); The spray auxiliary component (2) comprises a sleeve (21) fixed to the auxiliary side hole (14), a movable moving block (23) is arranged in the sleeve (21), the outer surface of the moving block (23) is tightly attached to the inner wall of the sleeve (21) in the circumferential direction, and the end close to the auxiliary side hole (14) is capable of cutting off the droplet addition hole (12); The moving block (23) is further provided with an auxiliary spray hole (24), the auxiliary spray hole (24) being able to communicate with the droplet spray hole (13) when the moving block (23) cuts off the droplet addition hole (12), and the two openings of the auxiliary spray hole (24) are respectively arranged toward the droplet spray hole (13) and away from the auxiliary side hole (14); One end of the sleeve (21) away from the auxiliary side hole (14) is connected to the air pipe (4) and is provided with an induction coil (22).

2. A multi-mode 3D printer head according to claim 1, characterized in that: The inner diameter of the auxiliary spray hole (24) is larger than that of the droplet spray hole, and the opening close to the droplet spray hole (13) is a bell mouth (25).

3. A multi-mode 3D printer head according to claim 2, characterized in that: The connecting section between the liquid droplet adding hole (12) and the liquid droplet spraying hole (13) is a conical section.

4. A multi-mode 3D printer head according to claim 3, characterized in that: The diameter of the droplet addition hole (12) is greater than the diameter of the droplet injection hole, and the inclination angle of the conical section is 0°-45°.

5. A multi-mode 3D printer head according to claim 1, characterized in that: The induction coil (22) can adsorb the moving block (23) after being energized, and the adsorbed moving block (23) can be away from the droplet adding hole (12).

6. A multi-mode 3D printer head according to claim 1, characterized in that: An annular groove (15) is provided on a side of the die head body (1) away from the feeding mechanism (7); the annular groove (15) is located between the extrusion hole (11) and the droplet injection hole (13), and a heating mechanism is provided.

7. A multi-mode 3D printer head according to claim 1, characterized in that: The feeding mechanism (7) comprises a connecting frame (71) detachably connected to the head body (1), and the connecting frame (71) is provided with a driving wheel (72) and a driven wheel (73) for transporting the vertical profile (8) above the extrusion hole (11), and the spacing between the driven wheel (73) and the driving wheel (72) can be adjusted.

8. A multi-mode 3D printer head collaborative printing method, characterized in that: A multi-mode 3D printer head according to any one of claims 1 to 7 is used, and comprises the following steps: S1. The software virtual printing platform obtains the 3D model and profile material to be printed; S2, the software slices the three-dimensional model to obtain the slices of the model to be printed; S3, the software performs overall planning based on the number of printed profile materials and the size of the three-dimensional model, obtains the droplet jet printing program segment and the extrusion molding printing program segment, and transmits them to the controller; S4, the controller runs the droplet jet printing program segment and the extrusion molding printing program segment in sequence, and a compensation program is set between the droplet jet printing program segment and the extrusion molding printing program segment; S5. Complete the printing work.

9. A multi-mode 3D printer head collaborative printing method according to claim 8, characterized in that: The compensation program includes a height adjustment program, and the adjustment height dimension of the height adjustment program is the same as the spacing dimension between the lower end of the extrusion hole (11) and the intersection of the plurality of droplet injection holes (13).

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