A 3D printer head, a 3D printer, and a 3D printing and forming method

Abstract

The present invention provides a 3D printer head, a 3D printer, and a 3D printing and forming method. The 3D printer head includes a housing, a first raw material feeding mechanism, a second raw material feeding mechanism, and a needling mechanism. The raw materials of the first raw material feeding mechanism and the second raw material feeding mechanism are mixed in a material guiding tube and then flow out through a nozzle of the material guiding tube. Then, the needling mechanism performs a needling operation on the material flowing out of the nozzle of the material guiding tube. The present invention relates to the technical field of additive manufacturing. It is applicable to the situation of 3D printing and preparing articles using textile cotton strips as raw materials, and can prepare high-density integral special-shaped cotton layer structural parts; it can perform 3D printing using textile cotton strips of different diameters as raw materials; by adjusting the needling speed, the structural parts can meet different density requirements; for textile cotton strips of different diameters, the feeding amount of the polymer can be adjusted; the number or arrangement of the needles can be adjusted; it has the beneficial effects of being compact in structure and convenient to operate.

Description

Technical Field

[0001] The present invention relates to the technical field of additive manufacturing, and in particular to a 3D printer head, a 3D printer and a 3D printing method. Background Art

[0002] 3D printing is a rapid prototyping technology, also known as additive manufacturing. It is a technology that uses model files as the basis to construct objects by printing raw materials through 3D printing. There are many kinds of raw materials available for 3D printing, and objects of almost any shape can be printed. The molding time is short, and it can be widely used in various fields.

[0003] The invention with application number 201711266010.X discloses a 3D printing molding process method and device for improving the strength and toughness of printed parts. Through a 3D printing device including a pin, an extruder head, an extruder head seat and a heater, and a 3D printing consumable wire feeder, during the 3D printing extrusion wire feeding process, high-speed pin movement is performed synchronously, and the pin is used to pierce the printing layer and the printing bottom layer, and the printing layer and the printing bottom layer form a concave mortise structure at the pin position. Compared with the traditional 3D printing molding extrusion device, this invention can effectively improve the fatigue resistance, strength and toughness of the molding component, making the printed part more stable and firm; at the same time, the device can modularly replace the existing fused deposition 3D printer extrusion system. However, this device is not suitable for the situation where textile cotton strips are used as raw materials for 3D printing and preparing objects. Summary of the invention

[0004] In order to solve at least one of the above technical problems, the present invention provides a 3D printer head, a 3D printer and a 3D printing method.

[0005] A first aspect of the present invention provides a 3D printer head, comprising a shell, a first raw material feeding mechanism, a second raw material feeding mechanism and a needling mechanism, wherein the raw material of the first raw material feeding mechanism and the raw material of the second raw material feeding mechanism are mixed in a material guide pipe and then flow out through a nozzle of the material guide pipe, and then the needling mechanism performs a needling operation on the material flowing out of the nozzle of the material guide pipe.

[0006] Preferably, the first raw material feeding mechanism includes a first motor, a feeding pipe, a feeding driving wheel, a feeding driven wheel and a guide pipe, the feeding driving wheel is fixedly connected to the rotating output shaft of the first motor, the outer diameter surface of the feeding driving wheel is tangent to the outer diameter surface of the feeding driven wheel, and the outer diameter surface of the feeding driven wheel is provided with an annular groove surrounding the outer diameter surface of the feeding driven wheel; the outlet of the feeding pipe is arranged on one side of the tangent position of the feeding driving wheel and the feeding driven wheel, and faces the annular groove at the tangent position; the inlet of the guide pipe is arranged on the other side of the tangent position of the feeding driving wheel and the feeding driven wheel, and faces the annular groove at the tangent position.

[0007] Preferably, in any of the above solutions, the material guide pipe nozzle is arranged on the housing, so that the materials of the first material feeding mechanism and the second material feeding mechanism after mixing can flow out of the 3D printer head.

[0008] Preferably, in any of the above solutions, the first material feeding mechanism further includes a driven wheel bracket, one end of the driven wheel bracket is fixedly arranged on the side wall of the housing, connecting shafts are arranged at both ends of the feeding driven wheel, and the connecting shafts are connected to the other end of the driven wheel bracket through first deep groove ball bearings.

[0009] Preferably, in any of the above solutions, the feeding pipe is fixedly installed on the housing, and the inlet of the feeding pipe is located outside the housing.

[0010] Preferably, in any of the above solutions, the feeding driving wheel, the feeding driven wheel and the material guide pipe are located inside the housing.

[0011] Preferably, in any of the above solutions, the material of the first material feeding mechanism includes textile cotton strips.

[0012] Preferably, in any of the above solutions, the second material feeding mechanism includes an infusion pipe, an infusion pipe through hole, at least one liquid guide hole and a liquid containing cavity, the infusion pipe through hole and the liquid containing cavity are arranged on the housing, the inlet of the infusion pipe is located outside the housing, a part of the infusion pipe is placed in the infusion pipe through hole, and its outlet is communicated with the liquid containing cavity; the at least one liquid guide hole is arranged on the pipe wall of the material guide pipe located in the liquid containing cavity and penetrates through the pipe wall.

[0013] Preferably, in any of the above solutions, the second material feeding mechanism further includes a liquid container with adjustable pressure, and the outlet of the liquid container with adjustable pressure is communicated with the inlet of the infusion pipe.

[0014] Preferably, in any of the above solutions, the material of the second material feeding mechanism includes a high molecular polymer.

[0015] Preferably, in any of the above solutions, the high molecular polymer includes at least one of photocuring paint and thermocuring paint.

[0016] Preferably, in any of the above solutions, the needling mechanism includes a second motor, a camshaft, a cam connecting rod, a cam bracket, a needle bed plate, and a needle. The rotating output shaft of the second motor is fixedly connected to the camshaft. The camshaft is provided with a second deep groove ball bearing at a position deviating from the center of the circle. The cam bracket is provided with a third deep groove ball bearing. Two ends of the cam connecting rod are respectively connected to the second deep groove ball bearing on the camshaft and the third deep groove ball bearing on the cam bracket. The needle bed plate is fixedly installed on the cam bracket, and the needle is fixedly arranged on the needle bed plate.

[0017] Preferably, in any of the above solutions, the needling mechanism further includes a guiding assembly, which includes a guiding column and a linear bearing. Two ends of the guiding column are respectively fixedly installed on the upper and lower inner side walls of the housing. The linear bearing is sleeved on the guiding column and fixedly connected to the cam bracket.

[0018] Preferably, in any of the above solutions, there are two sets of the guiding assemblies, which are symmetrically arranged with respect to the cam bracket.

[0019] Preferably, in any of the above solutions, there are several needles, which are distributed in an array on the needle bed plate.

[0020] Preferably, in any of the above solutions, needle holes are provided at positions corresponding to the needles on the housing.

[0021] Preferably, in any of the above solutions, along the advancing direction of the 3D printer head, the needle holes are located behind the nozzle of the material guiding tube.

[0022] Preferably, in any of the above solutions, the 3D printer head further includes a curing mechanism, which includes an infrared lamp tube and / or an ultraviolet lamp tube, and a lamp tube fixing hole. The infrared lamp tube and / or the ultraviolet lamp tube are arranged in the lamp tube fixing hole. Along the advancing direction of the 3D printer head, the lamp tube fixing hole is located behind the needle holes.

[0023] Preferably, in any of the above solutions, the 3D printer head further includes a control assembly, which includes a first raw material feeding mechanism controller, a second raw material feeding mechanism controller, a needling mechanism controller, a curing mechanism controller, and a control panel. Through the control panel, the first raw material feeding mechanism controller, the second raw material feeding mechanism controller, the needling mechanism controller, and the curing mechanism controller respectively control the first raw material feeding mechanism, the second raw material feeding mechanism, the needling mechanism, and the curing mechanism.

[0024] The second aspect of the present invention provides a 3D printer, including the 3D printer head.

[0025] The third aspect of the present invention provides a 3D printing forming method, which is implemented by the 3D printer head or the 3D printer, and includes:

[0026] Step 1: Feed the first raw material and the second raw material;

[0027] Step 2: Mix the first raw material and the second raw material so that the second raw material is coated on the surface of the first raw material and immersed in the first raw material;

[0028] Step 3: The mixed first raw material and second raw material flow out of the 3D printer head;

[0029] Step 4: Perform a needling operation on the mixed first raw material and second raw material after flowing out to increase the connection between the first raw materials and increase the density of the structural member.

[0030] Preferably, the method further includes Step 5: Cure the needled structural member.

[0031] Preferably in any of the above solutions, Step 5 includes at least one of ultraviolet curing or thermal curing of the needled structural member.

[0032] Preferably in any of the above solutions, the method further includes Step 6: Perform at least one of carbonization treatment and graphitization treatment on the structural member so that the structural member meets the usage requirements.

[0033] The 3D printer head, 3D printer and 3D printing forming method of the present invention have the following beneficial effects:

[0034] 1. It is applicable to the situation of 3D printing and preparing articles with textile cotton strips as raw materials, and can prepare high-density integral special-shaped cotton layer structural members;

[0035] 2. It can perform 3D printing with textile cotton strips of different diameters as raw materials according to needs;

[0036] 3. It can adjust the needling speed to make the structural member meet different density requirements;

[0037] 4. It can adjust the feeding amount of the polymer for textile cotton strips of different diameters so that the polymer can be evenly coated on the surface of the textile cotton strip and immersed in the cotton strip;

[0038] 5. It can adjust the number or arrangement of the needles according to the width of the workpiece or the diameter of the textile cotton strip;

[0039] 6. It has a compact structure and is convenient to operate. Description of the Drawings

[0040] Figure 1Partial front structural schematic diagram of a preferred embodiment of the 3D printer head according to the present invention.

[0041] Figure 2 As of the 3D printer head according to the present invention Figure 1 Partial structural schematic diagram along direction A of the illustrated embodiment.

[0042] Figure 3 As of the 3D printer head according to the present invention Figure 1 Partial right structural schematic diagram of the illustrated embodiment.

[0043] Figure 4 As of the 3D printer head according to the present invention Figure 3 Partial structural schematic diagram of the cross-section along B-B of the illustrated embodiment.

[0044] Figure 5 As of the 3D printer head according to the present invention Figure 2 Partial structural schematic diagram of the cross-section along C-C of the illustrated embodiment.

[0045] Figure 6 As of the 3D printer head according to the present invention Figure 1 Another partial front structural schematic diagram of the illustrated embodiment.

[0046] Figure 7 As of the 3D printer head according to the present invention Figure 6 Partial structural schematic diagram along direction D of the illustrated embodiment.

[0047] Figure 8 As of the 3D printer head according to the present invention Figure 1 Structural schematic diagram of the feeding driven wheel of the illustrated embodiment.

[0048] Figure 9 As of the 3D printer head according to the present invention Figure 5 Enlarged structural schematic diagram within the dashed box of the illustrated embodiment.

[0049] The components represented by the reference numerals in the figure are:

[0050] 1 - First raw material feeding mechanism, 11 - First motor, 12 - Feeding pipe, 13 - Feeding driving wheel, 14 - Feeding driven wheel, 15 - Driven wheel bracket, 16 - First deep groove ball bearing, 17 - Material guiding pipe, 171 - Material guiding pipe nozzle, 2 - Second raw material feeding mechanism, 21 - Infusion pipe, 22 - Infusion pipe through hole, 23 - Liquid guiding hole, 24 - Liquid containing cavity, 3 - Needling mechanism, 31 - Second motor, 32 - Camshaft, 33 - Second deep groove ball bearing, 34 - Cam connecting rod, 35 - Cam bracket, 36 - Linear bearing, 37 - Guide post, 38 - Needle bed plate, 39 - Needle, 310 - Needle hole, 311 - Third deep groove ball bearing, 4 - Curing mechanism, 41 - Infrared lamp tube, 42 - Ultraviolet lamp tube, 43 - Lamp tube fixing hole, 5 - Housing. Detailed implementation mode

[0051] To better understand the present invention, the present invention will be described in detail below in conjunction with specific embodiments. It should be noted that in the accompanying drawings mentioned in the following embodiments, in order to more clearly show the specific structure of a certain part of the present application, there is a situation where some irrelevant structures are omitted from display in a certain drawing. Those skilled in the art should understand the specific structure of the present application in combination with all the drawings and related text descriptions, and should not consider that the omitted parts do not exist.

[0052] Embodiment 1

[0053] As Figures 1 to 9 shown, a 3D printer head includes a housing 5, a first raw material feeding mechanism 1, a second raw material feeding mechanism 2 and a needling mechanism 3. The raw materials of the first raw material feeding mechanism 1 and the raw materials of the second raw material feeding mechanism 2 are mixed in the material guiding pipe 17 and then flow out through the material guiding pipe nozzle 171, and then the needling mechanism 3 needles the material flowing out of the material guiding pipe nozzle 171.

[0054] As Figure 1 、 Figure 3 、 Figure 4 and Figure 8As shown, the first raw material feeding mechanism 1 includes a first motor 11, a feeding pipe 12, a feeding driving wheel 13, a feeding driven wheel 14, and a material guiding pipe 17. The feeding driving wheel 13 is fixedly connected to the rotating output shaft of the first motor 11. The outer diameter surface of the feeding driving wheel 13 is tangent to the outer diameter surface of the feeding driven wheel 14. An annular groove 141 surrounding the outer diameter surface of the feeding driven wheel is provided on the outer diameter surface of the feeding driven wheel 14. The outlet of the feeding pipe 12 is arranged on one side of the tangent position of the feeding driving wheel 13 and the feeding driven wheel 14 and faces the annular groove at the tangent position. The inlet of the material guiding pipe 17 is arranged on the other side of the tangent position of the feeding driving wheel 13 and the feeding driven wheel 14 and faces the annular groove at the tangent position. The material guiding pipe nozzle 171 is arranged on the housing 5 so that the raw materials of the first raw material feeding mechanism 1 and the raw materials of the second raw material feeding mechanism 2 after mixing can flow out of the 3D printer head. The first raw material feeding mechanism 1 further includes a driven wheel bracket 15. One end of the driven wheel bracket 15 is fixedly arranged on the side wall of the housing 5. Connecting shafts are provided at both ends of the feeding driven wheel 14 (i.e., the two circular surfaces of the feeding driven wheel 14), and the connecting shafts are connected to the other end of the driven wheel bracket 15 through first deep groove ball bearings 16. The feeding pipe 12 is fixedly installed on the housing 5, and the inlet of the feeding pipe 12 is located outside the housing 5. The feeding driving wheel 13, the feeding driven wheel 14, and the material guiding pipe 17 are located inside the housing 5.

[0055] Preferably in this embodiment, the raw material of the first raw material feeding mechanism 1 is a textile cotton strip.

[0056] During use, the textile cotton strip enters the printer head from the inlet of the feeding pipe 12 and then flows out at the outlet of the feeding pipe 12. The first motor 11 drives the feeding driving wheel 13 to rotate, and then drives the feeding driven wheel 14 to rotate in the reverse direction. The textile cotton strip flowing out at the outlet of the feeding pipe 12 is clamped and driven into the material guiding pipe 17 through the annular groove 141, forming continuous feeding of the textile cotton strip. It should be noted that in order to be applicable to textile cotton strips of different diameters, the material guiding pipe 17 is detachably arranged, and thus different-diameter material guiding pipes 17 can be replaced according to textile cotton strips of different diameters.

[0057] Such as Figure 2 、 Figure 5 and Figure 9As shown, the second raw material feeding mechanism 2 includes an infusion tube 21, an infusion tube through-hole 22, at least one liquid guiding hole 23, and a liquid containing cavity 24. The infusion tube through-hole 22 and the liquid containing cavity 24 are arranged on the housing 5. The inlet of the infusion tube 21 is arranged outside the housing 5. A part of the infusion tube 21 is placed inside the infusion tube through-hole 22, and its outlet communicates with the liquid containing cavity 24. The at least one liquid guiding hole 23 is arranged on the pipe wall of the material guiding tube 17 inside the liquid containing cavity 24 and penetrates through the pipe wall.

[0058] Preferably in this embodiment, as Figure 9 shown as Figure 5 the structure within the dashed box in [reference] is rotated clockwise by 90°. A protruding portion is arranged on the outer wall of the lower end of the material guiding tube 17, and a cavity is arranged on the inner wall of the housing 5 at the corresponding position. A part of the protruding portion is placed inside the cavity to form the liquid containing cavity 24. The liquid containing cavity 24 can also be arranged in other ways in the prior art. A plurality of the liquid guiding holes 23 are arranged and are evenly distributed around the axis of the material guiding tube 17. The second raw material feeding mechanism 2 further includes a liquid container with adjustable pressure. The outlet of the liquid container with adjustable pressure communicates with the inlet of the infusion tube 21. The raw material of the second raw material feeding mechanism 2 is a high molecular polymer. It should be noted that the high molecular polymer includes at least one of photocuring paint and thermosetting paint. The photocuring paint and the thermosetting paint are used for curing and shaping the textile cotton strip.

[0059] By adjusting the pressure of the liquid container, the high molecular polymer in the liquid container is input into the infusion tube 21 at a set flow rate, then enters the liquid containing cavity 24 through the infusion tube through-hole 22, and then enters the material guiding tube 17 through the liquid guiding hole 23. Inside the material guiding tube 17, the high molecular polymer is mixed with the textile cotton strip, and the high molecular polymer is evenly coated on the surface of the textile cotton strip and infiltrates into the textile cotton strip.

[0060] As Figure 6 and Figure 7 shown, the needle punching mechanism 3 includes a second motor 31, a camshaft 32, a cam connecting rod 34, a cam bracket 35, a needle bed plate 38, and a punching needle 39. The rotating output shaft of the second motor 31 is fixedly connected to the camshaft 32. A second deep groove ball bearing 33 is arranged on the camshaft 32 at a position deviating from the center of the circle. A third deep groove ball bearing 311 is arranged on the cam bracket 35. The two ends of the cam connecting rod 34 are respectively connected to the second deep groove ball bearing 33 on the camshaft 32 and the third deep groove ball bearing 311 on the cam bracket 35. The needle bed plate 38 is fixedly installed on the cam bracket 35, and the punching needle 39 is fixedly arranged on the needle bed plate 38.

[0061] Preferably, in this embodiment, the needle punching mechanism 3 further includes a guiding assembly, which includes a guiding column 37 and a linear bearing 36. The two ends of the guiding column 37 are respectively fixedly installed on the upper and lower inner side walls of the housing 5. The linear bearing 36 is sleeved on the guiding column 37 and fixedly connected to the cam bracket 35. There are two sets of the guiding assemblies, which are symmetrically arranged with respect to the cam bracket 35. There are several needle punches 39, which are distributed in an array on the needle bed plate 38. A needle hole 310 is provided on the housing 5 at a position corresponding to the needle punch 39. Along the advancing direction of the 3D printer head, the needle hole 310 is located behind the material guiding tube nozzle 171. It should be noted that the number and arrangement of the needle punches 39 can be adaptively adjusted according to the width of the structural member or the diameter of the textile cotton strip.

[0062] The camshaft 32, the cam connecting rod 34 and the cam bracket 35 form an eccentric connecting rod structure. Driven by the second motor 31, the cam bracket 35 moves up and down along the guiding column 37, and then drives the needle punch 39 to move up and down to complete the needle punching action. After the material mixed with the textile cotton strip and the polymer flows out of the material guiding tube nozzle 171, the needle punch 39 performs a needle punching action on it, thereby increasing the hook connection and density between the textile cotton strips to form a cotton layer.

[0063] As Figure 2 shown, the 3D printer head further includes a curing mechanism 4. Preferably, in this embodiment, the curing mechanism includes an infrared lamp tube 41, a ultraviolet lamp tube 42 and a lamp tube fixing hole 43. Each lamp tube fixing hole 43 is provided with and installed with one infrared lamp tube 41 or one ultraviolet lamp tube 42. Along the advancing direction of the 3D printer head, the lamp tube fixing hole 43 is located behind the needle hole 310.

[0064] The cotton layer formed through the needle punching operation is cured by ultraviolet light curing and / or infrared heating curing through the curing mechanism.

[0065] The 3D printer head further includes a control component, which includes a first raw material feeding mechanism controller, a second raw material feeding mechanism controller, a needle punching mechanism controller, a curing mechanism controller and a control panel. Through the control panel, the first raw material feeding mechanism controller, the second raw material feeding mechanism controller, the needle punching mechanism controller and the curing mechanism controller respectively control the first raw material feeding mechanism, the second raw material feeding mechanism, the needle punching mechanism and the curing mechanism. Through the control component, at least one of the feeding speed of the first raw material feeding mechanism 1, the feeding speed of the second raw material feeding mechanism 2, the needle punching speed of the needle punching mechanism 3, the curing method of the curing mechanism 4, the curing temperature, etc. can be controlled.

[0066] Example 2

[0067] A 3D printer includes the 3D printer head. The 3D printer head is installed on a 3D printing platform to form the 3D printer. After 3D printing, textile cotton strips with different diameters form a high-density integrated cotton layer. According to the design, a special-shaped cotton layer structural member can be printed and formed by the 3D printer. Subsequently, processes such as carbonization and graphitization can be performed on the formed special-shaped cotton layer structural member to meet the usage requirements of the special-shaped cotton layer structural member.

[0068] Example 3

[0069] A 3D printing and forming method is implemented by the 3D printer head or the 3D printer, and includes:

[0070] Step 1: Feed the first raw material and feed the second raw material;

[0071] Step 2: Mix the first raw material and the second raw material so that the second raw material is coated on the surface of the first raw material and immersed in the first raw material;

[0072] Step 3: The mixed first raw material and second raw material flow out of the 3D printer head;

[0073] Step 4: Perform a needling operation on the mixed first raw material and second raw material after flowing out to increase the hook connection between the first raw materials and increase the density of the structural member.

[0074] Preferably in this embodiment, the method further includes Step 5: Cure the needled structural member. Step 5 includes at least one of ultraviolet curing or thermal curing of the needled structural member.

[0075] Preferably in this embodiment, the method further includes Step 6: Perform at least one of carbonization treatment and graphitization treatment on the structural member so that the structural member meets the usage requirements.

[0076] Example 4

[0077] Different from the foregoing embodiments, in this embodiment, the raw material of the first raw material feeding mechanism 1 is a fiber material, and the raw material of the second raw material feeding mechanism 2 is a resin material.

[0078] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the foregoing embodiments have described the present invention in detail, those skilled in the art should understand that they can modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features, and these replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present invention.

Claims

1. A 3D printer head, comprising a housing (5), characterized in that: it further comprises a first raw material feeding mechanism (1), a second raw material feeding mechanism (2) and a needle punching mechanism (3). The raw materials of the first raw material feeding mechanism (1) and the second raw material feeding mechanism (2) are mixed in a guide pipe (17) and then flow out through a guide pipe nozzle (171). Then, the needle punching mechanism (3) performs a needle punching operation on the material flowing out of the guide pipe nozzle (171); The first raw material feeding mechanism (1) includes a first motor (11), a feeding pipe (12), a feeding driving wheel (13), a feeding driven wheel (14) and a guide pipe (17). The feeding driving wheel (13) is fixedly connected to the rotating output shaft of the first motor (11). The outer diameter surface of the feeding driving wheel (13) is tangent to the outer diameter surface of the feeding driven wheel (14). An annular groove (141) surrounding the outer diameter surface of the feeding driven wheel is provided on the outer diameter surface of the feeding driven wheel (14). The outlet of the feeding pipe (12) is provided on one side of the tangent position of the feeding driving wheel (13) and the feeding driven wheel (14) and faces the annular groove at the tangent position. The inlet of the guide pipe (17) is provided on the other side of the tangent position of the feeding driving wheel (13) and the feeding driven wheel (14) and faces the annular groove at the tangent position; The second raw material feeding mechanism (2) includes an infusion pipe (21), an infusion pipe through hole (22), at least one liquid guide hole (23) and a liquid containing cavity (24). The infusion pipe through hole (22) and the liquid containing cavity (24) are provided on the housing (5). The inlet of the infusion pipe (21) is provided outside the housing (5). A part of the infusion pipe (21) is placed in the infusion pipe through hole (22), and its outlet communicates with the liquid containing cavity (24). The at least one liquid guide hole (23) is provided on the pipe wall of the guide pipe (17) located in the liquid containing cavity (24) and penetrates the pipe wall; The needle punching mechanism (3) includes a second motor (31), a camshaft (32), a cam link (34), a cam bracket (35), a needle bed plate (38), a needle (39), and a guiding assembly. The rotating output shaft of the second motor (31) is fixedly connected to the camshaft (32). The camshaft (32) is provided with a second deep groove ball bearing (33) at a position deviating from the center of the circle. The cam bracket (35) is provided with a third deep groove ball bearing (311). Two ends of the cam link (34) are respectively connected to the second deep groove ball bearing (33) on the camshaft (32) and the third deep groove ball bearing (311) on the cam bracket (35). The needle bed plate (38) is fixedly installed on the cam bracket (35), and the needle (39) is fixedly arranged on the needle bed plate (38). The guiding assembly includes a guiding column (37) and a linear bearing (36). Two ends of the guiding column (37) are respectively fixedly installed on the upper and lower inner side walls of the housing (5). The linear bearing (36) is sleeved on the guiding column (37) and is fixedly connected to the cam bracket (35).

2. The 3D printer head according to claim 1, characterized in that: The first raw material feeding mechanism (1) further includes a driven wheel bracket (15). One end of the driven wheel bracket (15) is fixedly arranged on the side wall of the housing (5). Two ends of the feeding driven wheel (14) are provided with connecting shafts, and the connecting shafts are connected to the other end of the driven wheel bracket (15) through first deep groove ball bearings (16).

3. The 3D printer head according to claim 1, characterized in that: The feeding pipe (12) is fixedly installed on the housing (5), and the inlet of the feeding pipe (12) is located outside the housing (5). The feeding driving wheel (13), the feeding driven wheel (14), and the material guiding pipe (17) are located inside the housing (5).

4. The 3D printer head according to claim 1, characterized in that: A needle hole (310) is provided on the housing (5) corresponding to the position of the needle (39). Along the advancing direction of the 3D printer head, the needle hole (310) is located behind the nozzle (171) of the material guiding pipe.

5. The 3D printer head according to claim 4, characterized in that: The 3D printer head further includes a curing mechanism (4). The curing mechanism includes an infrared lamp tube (41) and / or an ultraviolet lamp tube (42), and a lamp tube fixing hole (43). The infrared lamp tube (41) and / or the ultraviolet lamp tube (42) are arranged in the lamp tube fixing hole (43). Along the advancing direction of the 3D printer head, the lamp tube fixing hole (43) is located behind the needle hole (310).

6. A 3D printer, characterized in that: It includes the 3D printer head according to any one of claims 1-5.

7. A 3D printing and forming method, characterized in that: It is realized by the 3D printer head according to any one of claims 1-5 or the 3D printer according to claim 6, and includes: Step 1: Feed the first raw material and the second raw material; Step 2: Mix the first raw material and the second raw material so that the second raw material is coated on the surface of the first raw material and immersed in the first raw material; Step 3: The mixed first raw material and second raw material flow out of the 3D printer head; Step 4: Perform a needling operation on the mixed first raw material and second raw material after flowing out to increase the interlocking between the first raw materials and increase the density of the structural member.

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