CN221089983U - FDM type 3D printer feedway and FDM type 3D printer - Google Patents

Abstract

The utility model provides a feeding device of an FDM type 3D printer and the FDM type 3D printer, relating to the technical field of 3D printers, comprising: a base; at least two trays rotatably arranged on the base; at least two feeding pipes corresponding to the trays one by one; the wire switching piece is arranged on the base and provided with feeding holes corresponding to the feeding guide pipes one by one, a feeding channel communicated with the feeding holes and a discharging hole communicated with the feeding channel; one end of the discharging guide pipe is communicated with the discharging hole, and the other end of the discharging guide pipe is communicated with the spray head; the material wire driving components are arranged on the base, are connected with the feeding guide pipes in a one-to-one correspondence manner, and are used for extruding or retracting at least two material wire driving components of the material wires positioned in the feeding guide pipes; the material tray driving components are arranged on the base and in one-to-one corresponding transmission connection with the material trays and are used for driving the material trays to rotate so that the returned material wires are wound in the material trays. Therefore, the device has the advantages of recycling the material wires, saving the material wires and being capable of rapidly switching the material wires in different material trays.

Description

FDM type 3D printer feedway and FDM type 3D printer

Technical Field

The utility model relates to the technical field of 3D printers, in particular to an FDM type 3D printer feeding device and an FDM type 3D printer.

Background

The 3D printing technology is an emerging technology for constructing objects by stacking layers of materials using materials in the form of powder, liquid, wire, etc. based on digital model files. The current 3D printing technology mainly includes four kinds: light curing molding (SLA), three-dimensional powder bonding (3 DP), selective Laser Sintering (SLS), fused deposition rapid prototyping (FDM). Fused deposition rapid prototyping (FDM) is an emerging advanced 3D printing technology, which refers to that a printing material is heated and melted, a nozzle at the bottom of a nozzle head moves to a designated position according to model data under control of a program to extrude the molten material, and a three-dimensional entity is finally formed by stacking layer by layer.

Typically FDM type 3D printers each include a feeding device. For example, chinese utility model with grant publication No. CN215750779U discloses a feeding bracket for FDM, and specifically includes: the base is provided with a placing groove in the base, the material tray is matched with the placing groove, and the material tray is used for winding the feed wire in a winding drum of the material tray. However, in the technical scheme, only one material tray exists, so that after the material wires are used up, the material wires can be reused only by replacing new material wires, and the material wires with different colors cannot be switched in the middle to print models with different colors; in addition, the technical scheme has no wire recovery function, so that the extruded wire can only be used up or cut off to cause the waste of the wire.

Therefore, an FDM type 3D printer feeding device and an FDM type 3D printer with the functions of recycling the material wires, saving the material wires and rapidly switching the material wires in different material trays are to be designed.

Disclosure of utility model

The utility model aims to overcome the defects and shortcomings of the prior art, and provides a feeding device of an FDM type 3D printer and the FDM type 3D printer, which at least solve one of the technical problems, and have the advantages of recycling the material wires, saving the material wires and being capable of rapidly switching the material wires in different material trays.

To achieve the above object, in one aspect, the present utility model provides a feeding device for an FDM type 3D printer, including:

A base;

at least two trays rotatably arranged on the base for winding feed wires;

At least two feeding pipes which are in one-to-one correspondence with the material trays and are used for feeding wires to pass and transport;

The material wire switching piece is arranged on the base and is provided with feeding holes which are communicated with the feeding guide pipes in a one-to-one correspondence manner, a feeding channel which is communicated with the feeding holes and a discharging hole which is communicated with the feeding channel;

One end of the discharging conduit is communicated with the discharging hole, and the other end of the discharging conduit is communicated with the spray head;

The at least two material wire driving assemblies are arranged on the base, are connected with the feeding guide pipes in a one-to-one correspondence manner and are used for extruding or retracting the material wires positioned in the feeding guide pipes and the discharging guide pipes;

And the at least two material tray driving assemblies are arranged on the base and are in one-to-one transmission connection with the material trays and are used for driving the material trays to rotate so that the returned material wires are wound in the winding drums of the material trays.

Optionally, the material silk drive assembly includes first driving motor, feed gear and guiding gear, first driving motor set firmly in on the base, feed gear with first driving motor's output shaft, guiding gear rotatable locate on the base, and with guiding gear presss from both sides establishes the feeding pipe.

Optionally, the tray driving assembly includes a second driving motor fixed on the base, and an output shaft of the second driving motor is connected with and rotatably arranged on a differential driving shaft on the base, and two limiting discs of the tray and the surface of the differential driving shaft are in friction transmission.

Optionally, the differential drive shaft includes an inner shaft connected to an output shaft of the second drive motor; an outer shaft rotatably sleeved outside the inner shaft, wherein a sealing space is formed between the inner surface of the outer shaft and the outer surface of the inner shaft; and damping liquid filled in the sealed space.

Optionally, the tray driving assembly further comprises a driven shaft which is symmetrically arranged relative to the differential driving shaft and is rotatably arranged on the base and used for supporting the tray.

Optionally, the feeding device of the FDM type 3D printer further includes a wire detecting component disposed on the wire switching member and configured to detect that the wire passes through the wire switching member.

Optionally, a sliding hole is formed in one side of the feeding channel of the wire switching piece and is communicated with the feeding channel and the outside, and the wire detection assembly comprises a sliding block which is slidably arranged in the sliding hole and can be partially slid out of the sliding hole, and a pressure sensor which is arranged on the outer side of the wire switching piece and is used for detecting movement of the sliding block.

Optionally, the section of the sliding hole is rectangular, the sliding block is a cylindrical sliding block, the pressure sensor comprises a pressure spring plate, and part of the cylindrical sliding block can be propped against the pressure spring plate.

Optionally, the two trays are symmetrically arranged on the base; the two feeding guide pipes are in one-to-one correspondence with the material trays; the material wire switching piece is a three-way switching piece, the two feeding holes are correspondingly communicated with the two feeding guide pipes one by one, and the discharging holes are communicated with the discharging guide pipes; the two wire driving assemblies are arranged on the base and correspond to the feeding guide pipes one by one; the two tray driving assemblies are in one-to-one correspondence with the trays.

In another aspect, the utility model provides an FDM type 3D printer, which comprises a frame, a spray head movably arranged on the frame, and the feeding device of the FDM type 3D printer, wherein the discharging guide pipe is communicated with the spray head.

Compared with the prior art, the application has the advantages that:

Because the FDM type 3D printer feeding device comprises at least two trays, at least two feeding pipes, one wire switching piece, one discharging pipe, at least two wire driving assemblies and at least two tray driving assemblies, wires in different trays can be switched at any time to finish switching different color wires, and the continuity of 3D printing is ensured; in addition, under the cooperation of the material wire driving assembly, the material disc driving assembly, the feeding guide pipe and the discharging guide pipe, the extruded material wires can be recovered and rewound in the material disc, the material wires are saved, and the printing cost is saved.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a view angle of an embodiment of the present utility model;

FIG. 2 is a schematic view of another embodiment of the present utility model;

FIG. 3 is an enlarged partial schematic view at B in FIG. 2;

FIG. 4 is a schematic view of the structure of the embodiment of the utility model after the tray is removed;

FIG. 5 is a schematic view showing a bottom view of the tray according to the embodiment of the present utility model;

FIG. 6 is an exploded view of a tray drive assembly according to an embodiment of the present utility model;

FIG. 7 is a schematic diagram of a wire switching member and a wire detection assembly according to an embodiment of the present utility model;

FIG. 8 is a schematic view of a wire switching member and a wire detection assembly according to another embodiment of the present utility model;

Fig. 9 is a schematic cross-sectional view taken along line A-A in fig. 8.

Reference numerals illustrate:

100-FDM type 3D printer feeding device;

1-a base; 11-fixing feet;

2-a material tray; 21-a spool; 22-limiting plates;

3-a feed conduit;

4-a wire switching member; 4 a-a feed hole; 4 b-a feed channel; 4c, a discharge hole; 4 d-slide hole;

5-a discharge conduit;

6-a wire drive assembly; 61-a first drive motor; 62-a feed gear; 63-a guide gear;

7-a tray drive assembly; 71-a second drive motor; 72-differential drive shafts; 721-an inner shaft; 722-an outer shaft; 73-a driven shaft;

8-a wire detection assembly; 81-sliding blocks; 82-a pressure sensor; 821-pressure spring.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "back", "side", "circumferential", and the like of the present utility model indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. Moreover, the terms first, second, etc. are only used to distinguish a plurality of components or structures having the same or similar structure, and do not denote any particular limitation on the arrangement order or connection relationship.

Referring to fig. 1 to 9, in one aspect, an FDM type 3D printer feeding device 100 is provided, including: the device comprises a base 1, at least two trays 2, at least two feeding guide pipes 3, a wire switching piece 4, a discharging guide pipe 5, at least two wire driving assemblies 6 and at least two tray driving assemblies 7.

Wherein, the bottom of the base 1 is provided with four fixing feet 11. The two trays 2 are symmetrical and rotatably arranged on the base 1 for winding a supply wire (not shown in the figures), in particular a wire wound in a drum 21 of the tray 2. The specific two trays 2 may be wound with different color filaments, or may be wound with the same color filaments, which is not particularly limited herein. Two feeding pipes 3 are in one-to-one correspondence with the material trays 2 and are used for feeding wires to pass and transport. The wire switching member 4 is fixedly arranged on the base 1 through a fastener (not shown in the figure), specifically, in this embodiment, the wire switching member 4 is a three-way switching member having two feed holes 4a, a feed channel 4b and a discharge hole 4c, wherein the feed holes 4a are in one-to-one correspondence with the feed pipes 3, the feed channel 4b is in communication with the two feed holes 4a, and the discharge hole 4c is in communication with the feed channel 4 b. One end of the discharging conduit 5 is communicated with the discharging hole 4c, and the other end is communicated with a spray head (not shown in the figure) for conveying the material wire into the spray head. Two wire drive assemblies 6 are arranged on the base 1 and are connected with the feeding guide pipes 3 in a one-to-one correspondence manner, and are used for extruding or retracting wires in the feeding guide pipes 3 and the discharging guide pipes 5. The two tray driving assemblies 7 are arranged on the base 1 and are in transmission connection with the trays 2 in a one-to-one correspondence manner, and are used for driving the trays 2 to rotate so that the retracted material wires are wound in the reels 21 of the trays 2. In the embodiment of the present application, the FDM type 3D printer feeding device 100 is described by taking two trays 2, two feeding pipes 3, two wire driving assemblies 6 and two tray driving assemblies 7 as examples, but the number of the trays 2, the feeding pipes 3, the wire driving assemblies 6 and the two tray driving assemblies 7 of the FDM type 3D printer feeding device 100 is not limited to two, but may be three, four, five or more at the same time, and is not particularly limited herein, so long as the number is greater than or equal to two; the wire switching member 4 is not limited to the three-way switching member, and may be a four-way switching member, a five-way switching member, a six-way switching member, or more, as long as the number of the feed holes 4a of the wire switching member 4 and the number of the feed pipes 3 are in one-to-one correspondence, the discharge holes 4c are in communication with the discharge pipes 5, and the feed channel 4b is in communication with the plurality of feed holes 4a and the discharge holes 4c, which is not particularly limited herein.

Taking feeding of the left tray 2 as an example, the left wire driving component 6 extrudes the corresponding left feeding guide pipe 3, so that wires move towards the direction of the spray head, wires in the left tray 2 are pulled out and are conveyed into the spray head through the left feeding guide pipe 3, the wire switching piece 4 and the discharging guide pipe 5 to complete 3D printing operation, and at the moment, the left tray 2 passively rotates positively; in this embodiment, when the material wires in the material tray 2 are discharged, the rotation direction of the material tray 2 is defined as forward rotation. When the feeding of the tray 2 on the right is required to be switched, or printing is not required to be continued, the left wire driving assembly 6 reversely extrudes the corresponding left feeding guide pipe 3, so that the wires move towards the direction of the tray 2, are transmitted to the outside of the feeding guide pipe 3 through the left discharging guide pipe 5, the wire switching piece 4 and the feeding guide pipe 3, and meanwhile, the left tray driving assembly 7 drives the left tray 2 to reversely rotate, so that the retracted wires are rewound in the winding drum 21 of the left tray 2. At this time, if feeding is to be performed on the right-hand tray 2, the wire extrusion process is similar to that on the left-hand tray; the wire retract process on the right side is similar to the wire retract process on the left side and will not be described in detail here.

In this way, since the feeding device 100 of the FDM type 3D printer includes at least two trays 2, at least two feeding conduits 3, one wire switching member 4, one discharging conduit 5, at least two wire driving assemblies 6 and at least two tray driving assemblies 7, the wires located in different trays 2 can be switched at any time to complete switching of wires of different colors, so as to ensure continuity of 3D printing; in addition, under the cooperation of the wire driving assembly 6 and the tray driving assembly 7, the feeding guide pipe 3 and the discharging guide pipe 5, the extruded wire can be recovered and rewound in the tray 2, the wire is saved, and the printing cost is saved.

Alternatively, referring to fig. 2 and 3, in the present embodiment, the wire driving assembly 6 includes a first driving motor 61, a feeding gear 62 and a guiding gear 63, where the first driving motor 61 is fixed on the base 1 and is located at a position outside the circumference of the drum 21 of the tray 2, so that the wire can be smoothly pulled out from the tray 2; preferably, the first driving motor 61 is a servo motor. The feed gear 62 is connected to an output shaft (not shown) of the first drive motor 61 to receive an output torque of the first drive motor 61; the guide gear 63 is rotatably provided on the base 1, and the feed guide pipe 3 is interposed between the guide gear 63 and the base. Taking the left wire driving assembly 6 as an example, the first driving motor 61 rotates clockwise to drive the feeding gear 62 to rotate clockwise, and under the cooperation of the guide gear 63, the wire positioned in the feeding conduit 3 is extruded to move towards the wire switching member 4, so that the wire is pulled to enter the feeding conduit 3 from the wire tray 2, and synchronously, the wire tray 2 rotates forward to draw out the wire. When the excessive wire is required to be withdrawn, the first driving motor 61 rotates anticlockwise to drive the feeding gear 62 to rotate anticlockwise, and the wire in the feeding conduit 3 is extruded to move towards the wire tray 2 under the cooperation of the guiding gear 63, so that the wire in the feeding conduit 3 is withdrawn out of the feeding conduit 3, and synchronously, the wire tray 2 is driven by the wire tray driving assembly 7 to rotate reversely, so that the withdrawn wire tray is wound in the winding drum 21 of the wire tray 2. The motion principle of the wire driving assembly 6 on the right side is similar to that of the wire driving assembly 6 on the left side, and will not be described again here.

Alternatively, referring to fig. 1, in the present embodiment, the tray driving assembly 7 includes a second driving motor 71 and a differential driving shaft 72. The second driving motor 71 is fixed in a motor fixing seat on the base 1, and the differential driving shaft 72 is connected with an output shaft (not shown in the figure) of the second driving motor 71 and is rotatably arranged on the base 1. The two limiting plates 22 of the tray 2 and the surface of the differential driving shaft 72 are in friction transmission. In this way, during the withdrawal process, the withdrawn thread is rewound into the drum 21 of the tray 2 without being tangled. When the wire driving assembly 6 is reversely retracted, the second driving motor 71 rotates to drive the differential driving shaft 72 to rotate, and the tray 2 is driven to rotate reversely under the action of friction transmission, so that the retracted wire is wound in the winding drum 21 of the tray 2. Preferably, the second driving motor 71 is a servo motor. In order to increase the friction between the differential drive shaft 72 and the two limiting plates 22 of the tray 2, a friction sleeve (not shown in the figures) may be preferably fitted over the differential drive shaft 72.

Specifically, referring to fig. 6, in the present embodiment, the differential drive shaft 72 includes: the inner shaft 721, the outer shaft 722 and damping fluid (not shown). Wherein one end of the inner shaft 721 is connected to the output shaft of the second driving motor 71, and the other end of the inner shaft 721 is rotatably disposed on the base 1 through a bearing; the outer shaft 722 is rotatably sleeved outside the inner shaft 721, and a sealing space is formed between the inner surface of the outer shaft 722 and the outer surface of the inner shaft 721; the damping liquid is filled in the sealed space. In this way, the rotational speed difference between the inner shaft 721 and the outer shaft 722 can be coupled, so that the rotation of the driving tray 2 is smoother. Specifically, in the present embodiment, the damping liquid may be selected as damping grease.

In order to make the rotation of the tray 2 more stable, preferably, referring to fig. 4, in this embodiment, the tray driving assembly 7 further includes a driven shaft 73 symmetrically disposed with respect to the differential driving shaft 72 and rotatably disposed on the base 1 for supporting the tray 2. Specifically, both ends of the driven shaft 73 may be rotatably provided on the base 1 through bearings (not shown in the drawings).

In order to accurately switch the wires in the plurality of trays 2 and accurately determine the extrusion or withdrawal process of the wires so that the 3D printing effect conforms to the design of the digital model file, preferably, referring to fig. 5, 7 and 9, in this embodiment, the feeding device 100 of the FDM type 3D printer further includes a wire detecting component 8 disposed on the wire switching member 4 for detecting that the wires pass through the wire switching member 4. Specifically, one side of the feed channel 4b of the wire switching piece 4 is provided with a slide hole 4d which is communicated with the feed channel 4b and the outside; the material wire detection assembly 8 comprises a sliding block 81 and a pressure sensor 82, wherein the sliding block 81 is arranged in the sliding hole 4d in a sliding way and can partially slide out of the sliding hole 4d; the pressure sensor 82 is provided outside the wire switching member 4 for detecting movement of the slider 81. Specifically, the cross section of the sliding hole 4d is rectangular, the sliding block 81 is a cylindrical sliding block 81, the pressure sensor 82 includes a pressure spring 821, and the partial cylindrical sliding block 81 can be pressed against the pressure spring 821. Thus, when the wire driving assembly 6 extrudes the wire located in the feeding conduit 3, the wire passes through the feeding channel 4b in the wire switching member 4, the sliding block 81 is pushed to slide outwards, and the sliding block 81 partially slides out of the sliding hole 4d and is pressed against a pressure spring plate 821 of the pressure sensor 82, so that the success of feeding is judged. When the wire driving assembly 6 withdraws the wire located in the feeding duct 3 during the wire recovery operation, the wire is withdrawn into the feeding duct 3 through the feeding channel 4b in the wire switching member 4, the sliding block 81 slides inwards due to the negative pressure, and the sliding block 81 and the pressure spring 821 of the pressure sensor 82 are separated, the pressure sensor 82 determines that the wire completely passes through the wire switching member 4, and after a preset time of operation, the wire is completely withdrawn into the feeding duct 3. Of course, in other embodiments, the wire detecting component 8 may be an infrared detecting component, a magnetic induction detecting component, etc., which is not limited herein.

In another aspect, the embodiment of the present application provides an FDM type 3D printer (not shown in the drawing), which includes a frame (not shown in the drawing), and a nozzle (not shown in the drawing) movably disposed on the frame, and the feeding device 100 of the FDM type 3D printer, where the discharge conduit 5 is in communication with the nozzle. Since the FDM type 3D printer includes all the structural and connection technical features of the FDM type 3D printer feeding device 100, all the advantages of the FDM type 3D printer feeding device 100 are not described herein.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions.

Claims (10)

1. FDM type 3D printer feedway, its characterized in that includes:

A base (1);

At least two trays (2) rotatably arranged on the base (1) for winding feed wires;

At least two feeding pipes (3) are in one-to-one correspondence with the trays (2) and are used for feeding wires to pass and transport;

The material wire switching piece (4) is arranged on the base (1) and is provided with feeding holes (4 a) which are communicated with the feeding guide pipes (3) in one-to-one correspondence, a feeding channel (4 b) which is communicated with the feeding holes (4 a) and a discharging hole (4 c) which is communicated with the feeding channel (4 b);

One end of the discharging conduit (5) is communicated with the discharging hole (4 c), and the other end of the discharging conduit is communicated with the spray head;

The at least two material wire driving assemblies (6) are arranged on the base (1) and are connected with the feeding guide pipes (3) in a one-to-one correspondence manner, and are used for extruding or retracting the material wires positioned in the feeding guide pipes (3) and the discharging guide pipes (5);

And the at least two material tray driving assemblies (7) are arranged on the base (1) and are in one-to-one corresponding transmission connection with the material trays (2) and are used for driving the material trays (2) to rotate so that the returned material wires are wound in the material trays (2).

2. The FDM type 3D printer feeding device according to claim 1, wherein the wire driving assembly (6) includes a first driving motor (61), a feeding gear (62) and a guiding gear (63), the first driving motor (61) is fixedly arranged on the base (1), the feeding gear (62) is connected with an output shaft of the first driving motor (61), and the guiding gear (63) is rotatably arranged on the base (1) and is clamped with the guiding gear (63) to the feeding conduit (3).

3. The feeding device of the FDM type 3D printer according to claim 1, wherein the tray driving assembly (7) includes a second driving motor (71) fixedly arranged on the base (1), and a differential driving shaft (72) connected with an output shaft of the second driving motor (71) and rotatably arranged on the base (1), and two limiting discs (22) of the tray (2) and the differential driving shaft (72) are in surface friction transmission.

4. A 3D printer feeding device of the FDM type according to claim 3, wherein said differential drive shaft (72) comprises an inner shaft (721) connected to the output shaft of said second drive motor (71); an outer shaft (722) rotatably sleeved outside the inner shaft (721), wherein a sealing space is formed between the inner surface of the outer shaft (722) and the outer surface of the inner shaft (721); and damping liquid filled in the sealed space.

5. The FDM type 3D printer feeding device according to claim 3, wherein the tray driving assembly (7) further includes a driven shaft (73) symmetrically disposed with respect to the differential driving shaft (72) with respect to the tray (2) and rotatably disposed on the base (1) for supporting the tray (2).

6. The feeding device of an FDM type 3D printer according to claim 1, further comprising a wire detection assembly (8) disposed on the wire switching member (4) for detecting the passage of the wire through the wire switching member (4).

7. The feeding device of the FDM type 3D printer according to claim 6, wherein a sliding hole (4D) communicating the feeding channel (4 b) with the outside is formed at one side of the feeding channel (4 b) of the wire switching member (4), the wire detecting assembly (8) includes a sliding block (81) slidably disposed in the sliding hole (4D) and partially slidably disposed in the sliding hole (4D), and a pressure sensor (82) disposed outside the wire switching member (4) for detecting movement of the sliding block (81).

8. The feeding device for the FDM type 3D printer according to claim 7, wherein the cross section of the sliding hole (4D) is rectangular, the sliding block (81) is a cylindrical sliding block (81), the pressure sensor (82) includes a pressure spring plate (821), and a part of the cylindrical sliding block (81) can be pressed against the pressure spring plate (821).

9. The feeding device of an FDM type 3D printer according to claim 1, wherein two trays (2) are symmetrically arranged on the base (1); the two feeding guide pipes (3) are in one-to-one correspondence with the material trays (2); the material wire switching piece (4) is a three-way switching piece, the two feeding holes (4 a) are communicated with the two feeding pipes (3) in a one-to-one correspondence manner, and the discharging hole (4 c) is communicated with the discharging pipe (5); the two wire driving assemblies (6) are arranged on the base (1) and correspond to the feeding guide pipes (3) one by one; the two tray driving assemblies (7) are in one-to-one correspondence with the trays (2).

10. An FDM type 3D printer, comprising a frame, a spray head movably arranged on the frame, and a feeding device of the FDM type 3D printer according to any one of claims 1 to 9, wherein the discharge conduit (5) is communicated with the spray head.