Feeding module and 3D printer

Abstract

The invention discloses a feeding module and a 3D printer, and relates to the technical field of 3D printing, the feeding module comprises a charging tray frame and a feeding and returning device, the charging tray frame comprises a support and a plurality of charging tray frame rotating shafts, the plurality of charging tray frame rotating shafts are connected to the support at intervals, and the charging tray frame rotating shafts are used for placing charging trays loaded with wire materials; the feeding and discharging device comprises a shell, a plurality of material guiding frames, a feeding and discharging mechanism and a gear shifting mechanism, the material guiding frames are rotationally connected with the shell, each material guiding frame is provided with a material passing channel, the feeding and discharging mechanism is connected to the shell and provided with an extrusion face, the extrusion face is configured to drive wire materials in the material passing channels to move, and the gear shifting mechanism is connected to the shell and provided with a gear shifting opening. The gear shifting mechanism is provided with a gear shifting face, and the gear shifting face is configured to abut against the material guiding frame. Wherein the material disc frame rotating shafts and the material guiding frames are correspondingly arranged, and the wire materials on each material disc frame rotating shaft penetrate into a material passing channel of the corresponding material guiding frame. According to the technical scheme provided by the invention, the structure of switching the line materials with different colors by the feeding module is simplified, and the switching efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and particularly to a feeding module and a 3D printer. Background Art

[0002] A 3D printer, also known as a three-dimensional printer or a stereoscopic printer, is a rapid prototyping process device, which usually uses digital technology to print materials. The 3D printer uses wire material as the printing raw material, and the wire material is usually wound into a roll on a spool for convenient use by users.

[0003] For the convenience of users' operation, a 3D printer is generally provided with a spool holder, which can be used to support and place the spool. The wire material in the spool can be inserted into the extrusion mechanism of the print head; when the 3D printer is running, the extrusion mechanism can extrude the wire material for use by the nozzle in the print head; under the action of the extrusion mechanism, the wire material at the print head will pull the wire material in the spool to continuously move towards the nozzle. In the multi-color printing scenario, the 3D printer needs to switch the color of the printing wire material. The existing multi-color printing solutions include setting multiple nozzles, but setting multiple nozzles has extremely high assembly requirements. Otherwise, the printed parts will be offset or deformed, and the multi-nozzle solution requires the print head to carry multiple nozzles at the same time, resulting in an increase in weight and an increase in movement inertia, so high-speed printing cannot be performed. Another way is to spray multi-color wire materials from the same nozzle through an inclined throat tube, but each wire material needs to be driven by a separate stepper motor, which has very poor hardware compatibility and greatly increases the use cost of the 3D printer. Summary of the Invention

[0004] The main object of the present invention is to propose a feeding module and a 3D printer, aiming to simplify the structure of the feeding module for switching different color wire materials and improve the switching efficiency.

[0005] To achieve the above object, a feeding module proposed by the present invention includes:

[0006] A spool holder, which includes a bracket and a plurality of spool holder rotating shafts. The plurality of spool holder rotating shafts are connected to the bracket at intervals, and the spool holder rotating shafts are used to place the spools carrying wire materials; and

[0007] A feeding and discharging device, which includes a housing, a plurality of guide frames, a feeding and discharging mechanism and a shifting mechanism. The plurality of guide frames are rotatably connected to the housing, and each guide frame is provided with a wire passing channel. The feeding and discharging mechanism is connected to the housing, and the feeding and discharging mechanism is provided with an extrusion surface, which is configured to drive the wire material in the wire passing channel to move. The shifting mechanism is connected to the housing, and the shifting mechanism is provided with a shifting surface, which is configured to abut against the guide frame;

[0008] Wherein, the reel rack rotating shafts are arranged in one-to-one correspondence with the material guiding racks. The wire materials on each reel rack rotating shaft penetrate into one of the material passing channels of the material guiding rack. The shifting mechanism drives the shifting surface to drive the material guiding rack to rotate, so that each material passing channel has a material shifting state where the extrusion surface enters and a switching state where the extrusion surface leaves.

[0009] In one embodiment, the shifting mechanism includes a shifting driving member, a shifting transmission shaft, and a plurality of shifting wheels. The shifting transmission shaft is rotatably connected to the housing and is connected to the output end of the shifting driving member. The plurality of shifting wheels are sleeved on the shifting transmission shaft at intervals. Each shifting wheel is provided with a shifting surface. The shifting surface includes a contact surface and an avoidance groove. Each avoidance groove corresponds to one material guiding rack.

[0010] Wherein, the shifting driving member drives the shifting transmission shaft to rotate to drive the shifting wheels to rotate, so that the bottom of the avoidance groove or the contact surface abuts against the material guiding rack, and the material guiding rack is in the material shifting state or the switching state.

[0011] In one embodiment, the feeding and discharging mechanism includes a feeding and discharging driving member, a feeding and discharging transmission shaft, and a plurality of extrusion wheels. The feeding and discharging driving member is connected to the housing. The feeding and discharging transmission shaft is rotatably connected to the housing and is connected to the output end of the feeding and discharging driving member. The plurality of extrusion wheels are sleeved on the feeding and discharging transmission shaft at intervals. Each extrusion wheel corresponds to one material passing channel and is provided with the extrusion surface.

[0012] In one embodiment, the material guiding rack includes:

[0013] A main body frame, the main body frame is rotatably connected to the housing. The main body frame is provided with a first channel and a through port communicating with the first channel. The through port is used for the extrusion surface to enter the first channel.

[0014] A detection module, the detection module is connected to the main body frame. The detection module is provided with a full load detection member; and

[0015] A buffer sliding frame, the buffer sliding frame is provided with a second channel. One end of the buffer sliding frame is movably connected to one end of the main body frame, so that the second channel communicates with the first channel to form the material passing channel. The buffer sliding frame is provided with a triggering portion for triggering the full load detection member.

[0016] In one embodiment, the housing is provided with a rotating shaft, and at least a part of the main body frame is rotatably sleeved on the rotating shaft.

[0017] Wherein, the material guiding frame has a first position and a second position; at the first position, the extrusion surface enters the first channel through the through opening, and the material passing channel is in the material transferring state; at the second position, the extrusion surface leaves the first channel through the through opening, and the material passing channel is in the switching state.

[0018] In an embodiment, the material guiding frame further includes a transmission pipe, the detection module is further provided with an empty-load detection member, the transmission pipe is arranged at one end of the buffer sliding frame away from the main body frame, the transmission pipe is used for connecting with a printing module to transmit wire materials, and the triggering portion can also be used to trigger the empty-load detection member.

[0019] In an embodiment, the material guiding frame further includes an elastic sheet, the elastic sheet is connected to the main body frame and encloses a limiting space with the main body frame, and at least part of the buffer sliding frame is movably limited in the limiting space.

[0020] In an embodiment, the triggering portion is movably limited in the limiting space, and the elastic sheet is arranged between the detection module and the main body frame.

[0021] The elastic sheet at least includes a first bent protrusion and a second bent protrusion, both the first bent protrusion and the second bent protrusion protrude towards the main body frame, a first extending portion is arranged on one side of the first bent protrusion facing away from the limiting space, a second extending portion is arranged on one side of the second bent protrusion facing away from the limiting space, and the triggering portion is configured to press against the first bent protrusion or the second bent protrusion, so that the first extending portion triggers the full-load detection member or the second extending portion triggers the empty-load detection member.

[0022] In an embodiment, the feeding and discharging device further includes a material breakage detection mechanism, the material breakage detection mechanism includes a material breakage elastic member and a pressing member, the pressing member is elastically connected to the material guiding frame through the material breakage elastic member and at least partially extends into the material passing channel, the detection module is further provided with a material breakage detection member, and the pressing member is used to trigger the material breakage detection member.

[0023] In an embodiment, the feeding and discharging device further includes a mileage detection mechanism, the mileage detection mechanism includes a mileage detection wheel and a mileage detection gear, the mileage detection wheel is rotatably connected to the material guiding frame and at least partially extends into the material passing channel, the mileage detection gear rotates synchronously with the mileage detection wheel, the detection module is further provided with a mileage detection member, and the mileage detection gear is used to trigger the mileage detection switch.

[0024] In one embodiment, the spindle of the material tray rack includes a fixed shaft, a material tray cylinder, and a resistance assembly. The fixed shaft is connected to the bracket. The material tray cylinder is sleeved on the fixed shaft and is configured to rotate relative to the fixed shaft. The resistance assembly includes a first connecting member and a second connecting member that abut against each other. The first connecting member is connected to the fixed shaft, and the second connecting member is elastically connected to the material tray cylinder through an elastic member.

[0025] In one embodiment, the first connecting member is connected to one end of the fixed shaft away from the bracket, the second connecting member is disposed at one end of the material tray cylinder away from the bracket, one end of the elastic member is connected to the material tray cylinder, the other end of the elastic member is connected to the second connecting member, and the material tray cylinder and the second connecting member are limited between the first connecting member and the bracket.

[0026] In one embodiment, the resistance assembly further includes a pressing elastic piece, and the pressing elastic piece is disposed between the first connecting member and the second connecting member for pressing the first connecting member and the second connecting member.

[0027] The present invention also provides a 3D printer, which includes a printing device and the feeding module as described above.

[0028] In the technical solution of the present invention, the bracket serves as a support for the spindle of the material tray rack and plays a supporting role for the spindle of the material tray rack. There are multiple spindles of the material tray rack, and the multiple spindles of the material tray rack are spaced apart on the bracket. A material tray carrying wire material can be installed on each spindle of the material tray rack, and the wire material on each material tray rack can correspondingly advance and retreat materials to the printing device through the material passing channel of a guiding frame. In the feeding and discharging device, the guiding frame is rotatably connected to the housing, and the shifting mechanism can drive the guiding frame to rotate relative to the housing through the shifting surface to change the relative position between the guiding frame and the feeding and discharging mechanism, so that the extrusion surface provided by the feeding and discharging mechanism enters or leaves the material passing channel, that is, the material passing channel of a certain guiding frame is in a material moving state or a switching state. Through the shifting mechanism, the material passing channel of any guiding frame can be switched between the material moving state and the switching state. Among them, when the material passing channel is in the material moving state, the extrusion surface extends into the material passing channel and abuts against the wire material in the material passing channel, and the feeding and discharging mechanism drives the extrusion surface to drive the wire material to move in the material passing channel. When the material passing channel is in the switching state, the extrusion surface leaves the material passing channel, that is, even if the feeding and discharging mechanism drives the extrusion surface to continue to move, it will not drive the wire material to move in the material passing channel. It can be understood that material trays carrying wire materials of different colors can be respectively installed on the multiple spindles of the material tray rack, and wire materials of different colors can be respectively threaded through the material passing channels of the multiple guiding frames. When the 3D printer switches the wire material of the target color, the shifting mechanism switches the material passing channel of the guiding frame corresponding to the wire material to the material moving state to realize the switching transmission of wire materials of different colors. Description of the Drawings

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0030] Figure 1 Schematic structural diagram of the loading module in an embodiment provided by the present invention;

[0031] Figure 2 Schematic structural diagram of the feeding and discharging device in an embodiment provided by the present invention;

[0032] Figure 3 Schematic structural diagram of the feeding and discharging device removing part of the housing in an embodiment provided by the present invention;

[0033] Figure 4 Schematic structural diagram of the feeding and discharging device removing the housing in an embodiment provided by the present invention;

[0034] Figure 5 Another schematic structural diagram of the feeding and discharging device removing the housing in an embodiment provided by the present invention;

[0035] Figure 6 Schematic structural diagram of the shifting mechanism in an embodiment provided by the present invention;

[0036] Figure 7 Schematic structural diagram of the feeding and discharging mechanism in an embodiment provided by the present invention;

[0037] Figure 8 Schematic structural diagram of the guide rack in an embodiment provided by the present invention;

[0038] Figure 9 Exploded structural diagram of the guide rack in an embodiment provided by the present invention;

[0039] Figure 10 Another exploded structural diagram of the guide rack in an embodiment provided by the present invention;

[0040] Figure 11 Another schematic structural diagram of the guide rack in an embodiment provided by the present invention;

[0041] Figure 12 Cross-sectional structural diagram of the guide rack in an embodiment provided by the present invention;

[0042] Figure 13 Schematic structural diagram of the elastic piece in an embodiment provided by the present invention;

[0043] Figure 14 Schematic structural diagram of the spindle of the tray holder provided in an embodiment of the present invention;

[0044] Figure 15 Exploded structural diagram of the spindle of the tray holder provided in an embodiment of the present invention;

[0045] Figure 16 Schematic structural diagram of the tray cylinder provided in an embodiment of the present invention;

[0046] Figure 17 Schematic structural diagram of the clamping claw provided in an embodiment of the present invention;

[0047] Figure 18 Schematic structural diagram of the first connecting member provided in an embodiment of the present invention;

[0048] Figure 19 Schematic structural diagram of the second connecting member provided in an embodiment of the present invention;

[0049] Figure 20 Another schematic structural diagram of the second connecting member provided in an embodiment of the present invention;

[0050] Figure 21 Another schematic structural diagram of the pressing spring piece provided in an embodiment of the present invention;

[0051] Figure 22 Schematic cross-sectional structural diagram of the spindle of the tray holder provided in an embodiment of the present invention.

[0052] Explanation of the reference numerals in the drawings:

[0053] 100. Tray holder; 1. Spindle of the tray holder; 11. Fixed shaft; 111. Connecting cavity; 12. Tray cylinder; 121. Outer cylinder; 122. Inner cylinder; 123. Installation groove; 1231. Limit post; 1232. Limit hole; 1233. Bayonet; 124. Through cavity; 1241. Placing step; 1242. Notch; 13. Resistance assembly; 131. First connecting member; 1311. Connecting part; 1312. Supporting part; 1313. Clamping protrusion; 1314. Buckle structure; 132. Second connecting member; 1321. Limit protrusion; 1322. Limit groove; 1323. Positioning protrusion; 133. Pressing spring piece; 1331. Elastic protrusion; 1332. Positioning groove; 14. Elastic member; 15. Clamping claw; 151. Positioning post; 152. Buckle; 153. First section; 154. Second section; 1521. Fixed groove; 16. Claw spring piece; 2. Bracket; 21. Base; 22. Frame body;

[0054] 200. Feeding and discharging device; 3. Housing; 31. Rotating shaft; 32. Supporting elastic member; 4. Material guiding frame; 41. Main body frame; 411. First channel; 412. Through opening; 413. Mounting column; 414. Mounting hole; 415. Positioning pin; 416. Extending pipe; 417. Limiting step; 418. Bending convex part; 42. Buffer sliding frame; 421. Extending part; 422. Second channel; 423. Sleeve part; 424. Limiting cavity; 425. Trigger part; 426. Avoidance channel; 43. Detection module; 431. Full load detection member; 432. No-load detection member; 433. Material breakage detection member; 434. Mileage detection member; 44. Transmission pipe; 45. Elastic sheet; 451. First extending part; 452. Second extending part; 453. First bending protrusion; 454. Second bending protrusion; 455. Mounting plate; 4551. Through hole; 4552. Positioning hole; 46. Limiting space; 47. Material passing channel; 5. Feeding and discharging mechanism; 51. Feeding and discharging driving member; 52. Feeding and discharging transmission shaft; 53. Extrusion wheel; 531. Extrusion surface; 6. Shifting mechanism; 61. Shifting driving member; 62. Shifting transmission shaft; 63. Shifting wheel; 631. Shifting surface; 6311. Contact surface; 6312. Avoidance groove; 7. Material breakage detection mechanism; 71. Material breakage elastic member; 72. Pressing member; 8. Mileage detection mechanism; 81. Mileage detection wheel; 82. Mileage detection gear;

[0055] The realization, functional features and advantages of the purpose of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0056] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0057] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0058] In addition, if the embodiments of the present invention involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0059] Please refer to Figures 1 to 22 As shown, the present invention provides a loading module. The loading module includes a tray rack 100 and a feeding and discharging device 200. The tray rack 100 includes a bracket 2 and a plurality of tray rack rotating shafts 1. The plurality of tray rack rotating shafts 1 are connected to the bracket 2 at intervals. The tray rack rotating shafts 1 are used for placing trays carrying wire materials. The feeding and discharging device 200 includes a housing 3, a plurality of guide frames 4, a feeding and discharging mechanism 5, and a shifting mechanism 6. The plurality of guide frames 4 are rotatably connected to the housing 3. Each guide frame 4 is provided with a material passing channel 47. The feeding and discharging mechanism 5 is connected to the housing 3. The feeding and discharging mechanism 5 is provided with an extrusion surface 531, and the extrusion surface 531 is configured to drive the wire material in the material passing channel 47 to move. The shifting mechanism 6 is connected to the housing 3. The shifting mechanism 6 is provided with a shifting surface 631, and the shifting surface 631 is configured to abut against the guide frame 4. Among them, the tray rack rotating shafts 1 and the guide frames 4 are arranged in one-to-one correspondence. The wire material on each tray rack rotating shaft 1 penetrates into a material passing channel 47 of the guide frame 4. The shifting mechanism 6 drives the shifting surface 631 to drive the guide frame 4 to rotate, so that each material passing channel 47 has a material moving state in which the extrusion surface 531 enters and a switching state in which the extrusion surface 531 leaves.

[0060] It can be understood that a 3D printer generally includes a tray rack, a feeding and discharging device, and a printing device. Among them, the tray rack is equipped with a tray for winding wire materials. The wire material can be fed to the printing device through the feeding and discharging device or can be retracted into the tray through the feeding and discharging mechanism. That is, the feeding and discharging mechanism can be used for feeding or for retracting. The printing device includes an extrusion assembly and a nozzle. The extrusion assembly is used for feeding or retracting materials to the nozzle. During the feeding process of the tray, the wire material is fed to the nozzle through the feeding and discharging mechanism and the extrusion assembly. During the retracting process of the tray, the printing device cuts the wire material, and the extrusion assembly and the feeding and discharging device retract the wire material into the tray. Optionally, the printing device can cut the wire material between the extrusion assembly and the nozzle, or can directly cut the wire material in the extrusion assembly, which is not specifically limited herein.

[0061] In this embodiment, the bracket 2 serves as a support for the coil rack rotating shaft 1, providing support for the coil rack rotating shaft 1. There are multiple coil rack rotating shafts 1, which are arranged at intervals on the bracket 2. One coil loaded with wire materials can be installed on each coil rack rotating shaft 1. The wire materials on each coil rack 100 can be fed into and out of the printing device through the material passing channel 47 of a corresponding material guiding frame 4.

[0062] In the feeding and discharging device 200, the material guiding frame 4 is rotatably connected to the housing 3. The shifting mechanism 6 can drive the material guiding frame 4 to rotate relative to the housing 3 through the shifting surface 631, so as to change the relative position between the material guiding frame 4 and the feeding and discharging mechanism 5, enabling the extrusion surface 531 of the feeding and discharging mechanism 5 to enter or leave the material passing channel 47, that is, enabling the material passing channel 47 of a certain material guiding frame 4 to be in the material transferring state or the switching state. Through the shifting mechanism 6, the material passing channel 47 of any material guiding frame 4 can be switched between the material transferring state and the switching state.

[0063] Wherein, when the material passing channel 47 is in the material transferring state, the extrusion surface 531 extends into the material passing channel 47 and abuts against the wire materials in the material passing channel 47. The feeding and discharging mechanism 5 drives the extrusion surface 531 to drive the wire materials to move in the material passing channel 47. When the material passing channel 47 is in the switching state, the extrusion surface 531 leaves the material passing channel 47. Even if the feeding and discharging mechanism 5 drives the extrusion surface 531 to continue moving, it will not drive the wire materials to move in the material passing channel 47. It can be understood that coils loaded with wire materials of different colors can be respectively installed on multiple coil rack rotating shafts 1, and wire materials of different colors can be respectively passed through the material passing channels 47 of multiple material guiding frames 4. When the 3D printer switches the wire materials of the target color, the shifting mechanism 6 switches the material passing channel 47 of the wire material corresponding guiding frame 4 to the material transferring state to realize the switching and transmission of wire materials of different colors.

[0064] In actual implementation, the feeding port and the discharging port communicated with the material passing channel 47 are arranged at both ends of the material guiding frame 4. The wire materials on the coil enter the material passing channel 47 from the feeding port and leave the material passing channel 47 from the discharging port and enter the printing device. The feeding and discharging mechanism 5 can drive the extrusion surface 531 to rotate from the feeding port to the discharging port direction to drive the wire materials to feed into the printing device, or drive the extrusion surface 531 to rotate from the discharging port to the feeding port direction to drive the wire materials to retreat to the coil.

[0065] The bracket 2 includes a base 21 and a frame body 22. The base 21 is used to place the bracket 2, and the coil rack rotating shaft 1 is connected to the frame body 22. Optionally, the housing 3 can be installed at the middle position of the frame body 22, and multiple coil rack rotating shafts 1 can be symmetrically arranged on both sides of the frame body 22, which is beneficial to the stability of the bracket 2. Optionally, the number of material guiding frames 4 arranged can be 2, 3, 4, 5, 6, etc., and the number of coil rack rotating shafts arranged corresponds to 2, 3, 4, 5, 6, etc.

[0066] In an embodiment of the present invention, as Figure 3 , Figure 4 and Figure 6 shown, the shifting mechanism 6 includes a shifting driving member 61, a shifting transmission shaft 62 and a plurality of shifting wheels 63. The shifting transmission shaft 62 is rotatably connected to the housing 3 and is connected to the output end of the shifting driving member 61. The plurality of shifting wheels 63 are sleeved on the shifting transmission shaft 62 at intervals. Each shifting wheel 63 is provided with a shifting surface 631. The shifting surface 631 includes an abutting surface 6311 and an avoidance groove 6312. Each avoidance groove 6312 corresponds to a material guiding frame 4. Wherein, the shifting driving member 61 drives the shifting transmission shaft 62 to rotate, so as to drive the shifting wheels 63 to rotate, so that the bottom of the avoidance groove 6312 or the abutting surface 6311 abuts against the material guiding frame 4, and the material guiding frame 4 is in a material shifting state or a switching state.

[0067] In this embodiment, the circumferential surface of the shifting wheel 63 forms the shifting surface 631. The shifting surface 631 includes the abutting surface 6311 and the avoidance groove 6312, that is, the avoidance groove 6312 is a groove on the circumferential surface of the shifting wheel 63, and the abutting surface 6311 is the part of the circumferential surface of the shifting wheel 63 except the avoidance groove 6312. It can be understood that the distances from the bottom of the abutting surface 6311 and the avoidance groove 6312 to the rotation center of the shifting wheel 63 are different. The distance from the abutting surface 6311 to the rotation center of the shifting wheel 63 is longer than the distance from the bottom of the avoidance groove 6312 to the rotation center of the shifting wheel 63. Therefore, when the shifting driving member 61 drives the shifting wheel 63 to rotate, and the part of the shifting wheel 63 in contact with the material guiding frame 4 is switched from the abutting surface 6311 to the bottom of the avoidance groove 6312 or from the bottom of the avoidance groove 6312 to the abutting surface 6311, the material guiding frame 4 will rotate. The plurality of shifting wheels 63 are fixedly sleeved on the shifting transmission shaft 62. The shifting transmission shaft 62 is arranged along the axial direction of the shifting wheel 63 and is rotatably connected to the housing 3. The shifting driving member 61 drives the shifting transmission shaft 62 to rotate, so as to drive the shifting wheels 63 to rotate. In this way, a single driving mechanism can be used to realize the state switching of multiple material guiding frames 4. The fixed sleeving in this embodiment means that the positions of the shifting wheel 63 and the shifting transmission shaft 62 are relatively fixed. The shifting wheel 63 can be connected to the shifting transmission shaft 62 by a detachable method such as a buckle 152 or a screw, or can be integrally arranged with the shifting transmission shaft 62. The shifting wheels 63 and the material guiding frames 4 are arranged in one-to-one correspondence. Each shifting wheel 63 is provided with an abutting surface 6311 and an avoidance groove 6312. In this way, the load of the shifting driving member 61 can be reduced, and the rotation stability of the shifting wheel 63 can be improved. Each shifting wheel 63 is arranged corresponding to the position of the material guiding frame 4 on the shifting transmission shaft 62 and is sleeved on the shifting transmission shaft 62. The shifting driving member 61 drives the shifting rotating shaft 31 to rotate to drive all the shifting wheels 63 to rotate simultaneously.

[0068] It can be understood that when the bottom of the avoidance groove 6312 abuts against the material guiding frame 4, the material passing channel 47 of the material guiding frame 4 is in the material transferring state. When the abutting surface 6311 abuts against the material guiding frame 4, the material passing channel 47 of the material guiding frame 4 is in the switching state. In this way, the material passing channel 47 of the material guiding frame 4 can be switched between the material transferring state and the switching state. In this embodiment, the material guiding frame 4 is in the material transferring state, that is, the material passing channel 47 of the material guiding frame 4 is in the material transferring state. The extrusion surface 531 extends into the material passing channel 47 and abuts against the wire material in the material passing channel 47. The feeding and discharging mechanism 5 drives the extrusion surface 531 to drive the wire material to move in the material passing channel 47. When the material guiding frame 4 is in the switching state, that is, the material passing channel 47 of the material guiding frame 4 is in the switching state, the extrusion surface 531 leaves the material passing channel 47. Even if the feeding and discharging mechanism 5 drives the extrusion surface 531 to continue moving, it will not drive the wire material to move in the material passing channel 47.

[0069] The connection line of any two avoidance grooves 6312 is not parallel to the rotation axis of the shift wheel 63, so that at most only one material guiding frame 4 abuts against the bottom of the avoidance groove 6312 at the same time. That is, the shift driving part 61 only switches the material passing channel 47 of one material guiding frame 4 to the material transferring state at the same time, and the feeding and discharging device 200 only supplies wire materials of one color to the extrusion assembly at the same time.

[0070] It can be understood that the arrangement directions of multiple material guiding frames 4 are parallel to the axial direction of the shift wheel 63, and the projections of the avoidance grooves 6312 in the axial direction of the shift wheel 63 do not overlap, so that at most only one material guiding frame 4 abuts against the bottom of the avoidance groove 6312 at the same time.

[0071] In actual implementation, in the projection in the axial direction of the shift wheel 63, multiple avoidance grooves 6312 are evenly arranged along the circumferential direction of the shift wheel 63. For example, when there are three material guiding frames 4, three avoidance grooves 6312 are correspondingly arranged. In the projection in the axial direction of the shift wheel 63, the three avoidance grooves 6312 are arranged at intervals of 120° along the circumferential direction of the shift wheel 63. When there are four material guiding frames 4, four avoidance grooves 6312 are correspondingly arranged. In the projection in the axial direction of the shift wheel 63, the four avoidance grooves 6312 are arranged at intervals of 90° along the circumferential direction of the shift wheel 63.

[0072] It can be understood that in this embodiment, the number of the shift wheels 63 and the material guiding frames 4 are set in one-to-one correspondence. When a problem occurs with the shift wheel 63 and needs to be replaced, the user can replace a single shift wheel 63 specifically.

[0073] Optionally, one end of the shift transmission shaft 62 can be rotatably connected to the housing 3, and the other end can be directly connected to the driving end of the shift driving member 61. Or, both ends of the shift transmission shaft 62 are rotatably connected to the housing 3. A helical gear is fixedly sleeved on the shift transmission shaft 62. The shift driving member 61 is a rotary motor, and a worm is arranged at the output end of the shift driving member 61. The worm meshes with the helical gear to enable the shift driving member 61 to drive the shift transmission shaft 62 to rotate. In this way, the driving shaft of the shift driving member 61 and the shift transmission shaft 62 can be arranged at an angle, so as to reduce the installation space of the shift mechanism 6, improve the utilization rate of the space inside the housing 3, and be beneficial to reducing the volume of the feeding and discharging device 200.

[0074] In actual implementation, the shift driving member 61 and the shift transmission shaft 62 can also be transmitted through other reduction transmission mechanisms, which are not specifically limited herein. The shift driving member 61 is connected to the housing 3. The shift transmission shaft 62 can be rotatably connected to the housing 3 through a bearing.

[0075] Optionally, the material guiding frame 4 is provided with a bending convex portion 418. The material guiding frame 4 abuts against the shifting surface 631 through the bending convex portion 418. The abutting surface 6311 of the bending convex portion 418 and the shifting surface 631 is smoothly arranged to reduce the rotation resistance of the shifting wheel 63.

[0076] In another embodiment of the present invention, the shifting wheel 63 can be a long shaft roller. The corresponding abutting surface 6311 and the avoiding groove 6312 of each material guiding frame 4 are both arranged on a long shaft roller. At this time, one shifting wheel 63 corresponds to a plurality of material guiding frames 4.

[0077] In another embodiment of the present invention, the shifting surface 631 at least includes a first part and a second part. The distances between the first part and the second part and the rotation center of the shifting wheel 63 are different. The shift driving member 61 drives the shifting wheel 63 to rotate, and the first part and the second part alternately abut against the material guiding frame 4. The material passing channel 47 of the material guiding frame 4 can be switched between a material moving state and a switching state. Optionally, the first part is the abutting surface 6311, and the second part is the avoiding groove 6312. Or, the first part is the abutting surface 6311, and the second part is a protrusion. The specific shapes of the first part and the second part are not limited herein. The first part and the second part are both smoothly arranged to reduce the rotation resistance of the shifting wheel 63.

[0078] In an embodiment of the present invention, as Figure 3 、 Figure 5 and Figure 7As shown, the feeding and discharging mechanism 5 includes a feeding and discharging driving member 51, a feeding and discharging transmission shaft 52, and a plurality of extrusion wheels 53. The feeding and discharging driving member 51 is connected to the housing 3. The feeding and discharging transmission shaft 52 is rotatably connected to the housing 3 and connected to the output end of the feeding and discharging driving member 51. The plurality of extrusion wheels 53 are sleeved on the feeding and discharging transmission shaft 52 at intervals. Each extrusion wheel 53 is arranged corresponding to a material passing channel 47 and is provided with an extrusion surface 531.

[0079] In this embodiment, the extrusion wheel 53 can extend into the material passing channel 47 so that the extrusion surface 531 presses against the wire material in the material passing channel 47. At the same time, the feeding and discharging driving member 51 drives the extrusion wheel 53 to rotate to drive the wire material to move in the material passing channel 47. It can be understood that the circumferential surface of the extrusion wheel 53 is the extrusion surface 531 of the extrusion wheel 53, and the central axis of the extrusion wheel 53 is the rotation axis of the extrusion wheel 53. The distance from the extrusion surface 531 to the rotation center of the extrusion wheel 53 is equal everywhere, that is, the cross-section of the extrusion wheel 53 is circularly arranged to improve the smoothness of driving the wire material to move. The feeding and discharging driving member 51 can drive the wire material to feed or discharge by driving the extrusion wheel 53 to rotate forward or backward.

[0080] Optionally, the extrusion wheel 53 can be arranged as a long-axis roller. At this time, one extrusion wheel 53 can correspond to the material passing channels 47 of a plurality of guide frames 4. The guide frame 4 is provided with a through port 412 communicating with the material passing channel 47 for the extrusion wheel 53 to extend into or leave the material passing channel 47. Optionally, raised stripes are arranged on the extrusion surface 531 of the extrusion wheel 53 along the axial direction of the extrusion wheel 53 to increase the friction between the extrusion surface 531 and the wire material and prevent the wire material from slipping, which affects the feeding or discharging of the wire material.

[0081] It can be understood that the extrusion wheel 53 is fixedly sleeved on the feeding and discharging transmission shaft 52. The feeding and discharging transmission shaft 52 is arranged along the axial direction of the extrusion wheel 53 and is rotatably connected to the housing 3. The feeding and discharging driving member 51 drives the feeding and discharging transmission shaft 52 to rotate to drive the shifting wheel 63 to rotate. It can be understood that one end of the feeding and discharging transmission shaft 52 can be rotatably connected to the housing 3, and the other end is directly connected to the driving end of the feeding and discharging driving member 51. The feeding and discharging driving member 51 drives the feeding and discharging transmission shaft 52 to rotate forward or backward to drive the extrusion wheel 53 to rotate forward or backward, thereby realizing the feeding or discharging of the wire material in the material passing channel 47. The fixed sleeving in this embodiment means that the positions of the extrusion wheel 53 and the feeding and discharging transmission shaft 52 are relatively fixed. The extrusion wheel 53 can be connected to the feeding and discharging transmission shaft 52 by a detachable method such as a buckle 152 or a screw, or can be integrally provided with the feeding and discharging transmission shaft 52.

[0082] In actual implementation, both ends of the feed and withdraw material transmission shaft 52 are rotatably connected to the housing 3, a helical gear is fixedly sleeved on the feed and withdraw material transmission shaft 52, the feed and withdraw material driving member 51 is a rotary motor, and a worm is provided at the output end of the feed and withdraw material driving member 51, and the worm is meshed with the helical gear so that the feed and withdraw material driving member 51 drives the feed and withdraw material transmission shaft 52 to rotate. In this way, the drive shaft of the feed and withdraw material driving member 51 and the feed and withdraw material transmission shaft 52 can be arranged at an angle to reduce the installation space of the feed and withdraw material mechanism 5, which is conducive to reducing the volume of the feed and withdraw material device 200. The feed and withdraw material driving member 51 and the feed and withdraw material transmission shaft 52 can also be driven by other reduction transmission mechanisms, which are not specifically limited here. The feed and withdraw material transmission shaft 52 can be rotatably connected to the housing 3 through a bearing, and the feed and withdraw material driving member 51 is connected to the housing 3.

[0083] Furthermore, the extrusion wheel 53 is arranged in one-to-one correspondence with the material passage 47, and the volume of the extrusion wheel 53 is adapted to the volume of the material guide frame 4, so that the extrusion wheel 53 can extend into the material passage 47 through the through hole 4551 of the material guide frame 4, and at the same time, the load of the feeding and retracting driving member 51 can be reduced, and the stability of the extrusion wheel 53 driving the wire material to move is improved. When the extrusion wheel 53 has a problem and needs to be replaced, the user can replace a single extrusion wheel 53 in a targeted manner.

[0084] In one embodiment of the present invention, Figures 8 to 12 As shown, the material guide frame 4 includes a main frame 41, a detection module 43 and a buffer sliding frame 42. The main frame 41 is rotatably connected to the shell 3. The main frame 41 is provided with a first channel 411 and a port 412 connected to the first channel 411. The port 412 is used for allowing the extrusion surface 531 to enter the first channel 411; the detection module 43 is connected to the main frame 41, and the detection module 43 is provided with a full-load detection member 431; the buffer sliding frame 42 is provided with a second channel 422, and one end of the buffer sliding frame 42 is movably connected to one end of the main frame 41 so that the second channel 422 is connected to the first channel 411 to form a material transfer channel 47. The buffer sliding frame 42 is provided with a trigger part 425 for triggering the full-load detection member 431.

[0085] During the material tray feeding process, the wire material is fed to the nozzle through the feeding and withdrawing device 200 and the extrusion assembly; during the material tray pushing process, the printing module cuts off the wire material, and the extrusion assembly and the feeding and withdrawing module return the wire material to the material tray.

[0086] In this embodiment, the buffer sliding carriage 42 is movably connected to one end of the main body frame 41, and the second channel 422 communicates with the first channel 411 to form a material passing channel 47. An inlet is provided at one end of the main body frame 41 away from the buffer sliding carriage 42, and an outlet is provided at one end of the buffer sliding carriage 42 away from the main body frame 41. The wire material on the material tray can enter the material passing channel 47 through the inlet, and then leave the material passing channel 47 through the outlet and be transmitted to the extrusion assembly of the printing module. When the material guiding frame 4 is in the material moving state. The extrusion surface 531 extends into the first channel 411 through the passing port 412, and the feeding and discharging mechanism 5 drives the wire material in the first channel 411 to move, so as to drive the wire material to move in the material passing channel 47. During feeding, if the feeding and discharging mechanism 5 drives the extrusion surface 531 to drive the wire material to move at a speed greater than the speed at which the extrusion assembly drives the wire material, at this time, the feeding and discharging mechanism 5 will feed a section of wire material into the second channel 422 more. The wire material accumulates at the sliding buffer carriage. With the continuous driving of the feeding and discharging mechanism 5, the wire material in the second channel 422 will push the buffer sliding carriage 42, so that the buffer sliding carriage 42 moves relative to the main body frame 41 and drives the triggering part 425 to trigger the full load detection part 431. After the full load detection part 431 is triggered, the detection module 43 receives a full load signal, and can warn the user to pause the operation of the feeding and discharging mechanism 5 and wait for the extrusion assembly to complete the feeding of the extra wire material. In this way, problems such as wire material feeding failure or shaving caused by the feeding speed of the feeding and discharging mechanism 5 being greater than the feeding speed of the extrusion assembly can be avoided.

[0087] The triggering part 425 is used to trigger the full load detection part 431. When the triggering part 425 approaches or contacts the full load detection part 431, the full load detection part 431 is in a triggered state; when the triggering part 425 is away from the full load detection part 431, the full load detection part 431 is in an untriggered state.

[0088] Specifically, the full load detection part 431 can be set as a non-contact sensor such as a photoelectric sensor or an electromagnetic sensor for detecting in place. When the triggering part 425 enters the detection range of the full load detection part 431 and is detected by the full load detection part 431, the full load detection part 431 is triggered by the triggering part 425. Correspondingly, when the triggering part 425 leaves the detection range of the full load detection part 431, the full load detection part 431 is in an untriggered state; or, the full load detection part 431 is set as a contact sensor such as a piezoelectric sensor or a mechanical limit sensor for detecting in place. When the triggering part 425 contacts or presses against the triggering end of the full load detection part 431, the full load detection part 431 is triggered by the triggering part 425. Correspondingly, when the triggering part 425 leaves the triggering end of the full load detection part 431, the full load detection part 431 is in an untriggered state.

[0089] In this embodiment, the full load detection part 431 is set as a transmissive photoelectric switch. The transmissive photoelectric switch includes a transmitter and a receiver. When the triggering part 425 extends between the transmitter and the receiver, the transmissive photoelectric switch is triggered.

[0090] It is understandable that the buffer sliding carriage 42 can slide along the extension direction of the main body frame 41. When the wire material pushes the buffer sliding carriage 42 to trigger the full-load detection member 431, the buffer sliding carriage 42 moves away from the main body frame 41. In actual implementation, the buffer sliding carriage 42 can be slidably connected to one end of the main body frame 41, and the sliding connection method can be: a slide rail is provided on the main body frame 41 along the extension direction of the main body frame 41, and the buffer sliding carriage 42 is slidably arranged on the slide rail, or, the buffer sliding carriage 42 is movably sleeved on one end of the main body frame 41 and is in clearance fit with it. Specific limitations are not made here. The detection module 43 is connected to the main body frame 41 so that the position of the detection module 43 is fixed relative to the main body frame 41 and there will be no displacement from the main body frame 41 due to the vibration or shaking of the main body frame 41, avoiding affecting the buffer sliding carriage 42 from accurately triggering the full-load detection member 431 when full-load.

[0091] In an embodiment of the present invention, the feeding and discharging mechanism 5 is electrically connected to the detection module 43.

[0092] In this embodiment, when the full-load detection member 431 on the detection module 43 is triggered, the detection module 43 transmits a pause signal to the feeding and discharging device 200 to make the feeding and discharging device 200 pause driving the extrusion wheel 53 to rotate until the extrusion assembly in the printing module feeds the excess wire material completely. At this time, the buffer sliding carriage 42 will move back to its original position, and the triggering part 425 no longer triggers the full-load detection member 431. At this time, the detection module 43 can transmit an operation signal to the feeding and discharging device 200, and the feeding and discharging device 200 drives the extrusion wheel 53 to rotate again to drive the wire material in the material passing channel 47 to feed. When the full-load detection member 431 on the detection module 43 is triggered, the detection module 43 transmits a stop signal to the feeding and discharging device 200 to make the feeding and discharging device 200 stop driving the extrusion wheel 53, so as to facilitate the user to check the faults or problems that cause the printing module to be empty.

[0093] It is understandable that the detection module 43 can transmit a full-load signal and an empty-load signal to the control module of the 3D printer, and the control module correspondingly controls the operation of the feeding and discharging device 200 and the extrusion assembly.

[0094] In an embodiment of the present invention, as Figures 3 to 5 、 Figure 11 、 Figure 12 shown, the housing 3 is provided with a rotating shaft 31, and at least part of the main body frame 41 is rotatably sleeved on the rotating shaft 31; wherein, the material guiding frame 4 has a first position and a second position; in the first position, the extrusion surface 531 enters the first channel 411 through the passing opening 412, and the material passing channel 47 is in the material moving state; in the second position, the extrusion surface 531 leaves the first channel 411 through the passing opening 412, and the material passing channel 47 is in the switching state.

[0095] In this embodiment, the position of the feeding and retracting mechanism 5 is fixed relative to the housing 3, and the material guide frame 4 is rotatably sleeved on the rotating shaft 31 to achieve a rotatable connection with the housing 3. Optionally, the material guide frame 4 may also be provided with a rotating shaft 31, and the rotating shaft 31 may be rotatably connected to the housing 3.

[0096] The shift mechanism 6 can drive the shift surface 631 to drive the material guide frame 4 to rotate, so that the material guide frame 4 rotates to the first position or the second position. When the material guide frame 4 is in the first position, the extrusion surface 531 of the feed and retract mechanism 5 extends into the first channel 411, that is, the material transfer channel 47 is in a material moving state, and the extrusion surface 531 can drive the wire material in the material transfer channel 47 to move. When the material guide frame 4 is in the second position, the extrusion surface 531 leaves the first channel 411, that is, the material transfer channel 47 is in a switching state, and the wire material in the material transfer channel 47 is in a stationary state.

[0097] In this embodiment, when the material passage 47 is in the material moving state, the extrusion surface 531 extends into the material passage 47 and contacts the wire material in the material passage 47, and the material feeding and withdrawing mechanism 5 drives the extrusion surface 531 to drive the wire material to move in the material passage 47. When the material passage 47 is in the switching state, the extrusion surface 531 leaves the material passage 47, and even if the material feeding and withdrawing mechanism 5 drives the extrusion surface 531 to continue to move, it will not drive the wire material to move in the material passage 47.

[0098] It is understandable that the guide frame 4 will naturally be in a vertical position under the action of gravity when there is no other external force. In this embodiment, the first position is an inclined position, and the second position is a vertical position or a partially vertical position.

[0099] In this embodiment, the shift mechanism 6 and the feed and withdraw mechanism 5 are respectively arranged on both sides of the guide frame 4, the shift mechanism 6 is located on the side of the rotating shaft 31 close to the feed port, and the feed and withdraw mechanism 5 is located on the side of the rotating shaft 31 close to the discharge port, or the shift mechanism 6 and the feed and withdraw mechanism 5 are respectively arranged on both sides of the guide frame 4, the shift mechanism 6 is located on the side of the rotating shaft 31 close to the discharge port, and the feed and withdraw mechanism 5 is located on the side of the rotating shaft 31 close to the feed port. In this way, when the bottom of the avoidance groove 6312 of the shift wheel 63 abuts against the guide frame 4, the guide frame 4 is in the first position, that is, the inclined position, at which time the extrusion wheel 53 is close to the port 412; when the abutting surface 6311 of the shift wheel 63 abuts against the guide frame 4, the guide frame 4 is in the second position, that is, the vertical position or the partially vertical position, at which time the extrusion wheel 53 is away from the port 412.

[0100] Optionally, each guide rack 4 can be individually sleeved on a rotating shaft 31, and the housing 3 includes a plurality of spaced mounting walls for mounting the two ends of the rotating shaft 31. A plurality of guide racks 4 can also be arranged on the same rotating shaft 31, and the two ends of the rotating shaft 31 are mounted on the housing 3.

[0101] In actual implementation, the extending direction of the rotating shaft 31, the extending direction of the shifting transmission shaft 62, and the extending direction of the feeding and discharging transmission shaft 52 are arranged in parallel to improve the stability of the shifting mechanism 6 in shifting and the feeding and discharging mechanism 5 in driving the wire material.

[0102] In another embodiment of the present invention, the first position may also be a vertical position or a position inclined to the vertical, and the second position is an inclined position.

[0103] In this embodiment, the shifting mechanism 6 and the feeding and discharging mechanism 5 are respectively arranged on both sides of the material guiding frame 4. At the same time, both the shifting mechanism 6 and the feeding and discharging mechanism 5 are located on one side of the rotating shaft 31 close to the feeding port or the discharging port. Alternatively, the shifting mechanism 6 and the feeding and discharging mechanism 5 are arranged on the same side of the material guiding frame 4. The shifting mechanism 6 is located on the side of the rotating shaft 31 close to the feeding port, and the feeding and discharging mechanism 5 is located on the side of the rotating shaft 31 close to the discharging port, or the shifting mechanism 6 and the feeding and discharging mechanism 5 are arranged on the same side of the material guiding frame 4. The shifting mechanism 6 is located on the side of the rotating shaft 31 close to the discharging port, and the feeding and discharging mechanism 5 is located on the side of the rotating shaft 31 close to the feeding port. The above arrangements of the shifting mechanism 6 and the feeding and discharging mechanism 5 can all achieve that when the bottom of the avoiding groove 6312 of the shifting wheel 63 abuts against the material guiding frame 4, the material guiding frame 4 is in the second position, that is, the inclined position, and at this time, the extrusion wheel 53 is away from the through port 412; when the abutting surface 6311 of the shifting wheel 63 abuts against the material guiding frame 4, the material guiding frame 4 is in the first position, that is, the vertical position or a position inclined to the vertical, and at this time, the extrusion wheel 53 is close to the through port 412.

[0104] In an embodiment of the present invention, the feeding and discharging device 200 further includes a supporting elastic member 32. One end of the supporting elastic member 32 is connected to the housing 3, and the other end of the supporting elastic member 32 is connected to the material guiding frame 4. The extending direction of the supporting elastic member 32 is perpendicular to the axial direction of the rotating shaft 31.

[0105] In this embodiment, the material guiding frame 4 is connected to the housing 3 through the supporting elastic member 32. The elastic force of the supporting elastic member 32 enables the material guiding frame 4 to always abut against the shifting surface 631 of the shifting mechanism 6 to ensure that the material guiding frame 4 can smoothly switch between the material moving state and the switching state.

[0106] Optionally, the shifting mechanism 6 and the supporting elastic member 32 are respectively located on both sides of the material guiding frame 4, and both the shifting mechanism 6 and the material guiding frame 4 are arranged on one side of the rotating shaft 31 close to the feeding port or the discharging port. The supporting elastic member 32 is preset to a compressed state so that the material guiding frame 4 always abuts against the shifting surface 631.

[0107] Optionally, the shifting mechanism 6 and the supporting elastic member 32 are respectively located on both sides of the material guiding frame 4, and the shifting mechanism 6 and the material guiding frame 4 are respectively located on one side of the rotating shaft 31 close to the feeding port and on one side of the discharging port, or the shifting mechanism 6 and the material guiding frame 4 are respectively located on one side of the rotating shaft 31 close to the discharging port and on one side of the feeding port. The supporting elastic member 32 is preset to a stretched state so that the material guiding frame 4 always abuts against the shifting surface 631.

[0108] Optionally, the shifting mechanism 6 and the supporting elastic member 32 are located on the same side of the material guiding frame 4. When the shifting mechanism 6 and the material guiding frame 4 are both arranged on one side of the rotating shaft 31 close to the feeding port or the discharging port, the supporting elastic member 32 is preset to a stretched state so that the material guiding frame 4 always abuts against the shifting surface 631.

[0109] Optionally, the shifting mechanism 6 and the supporting elastic member 32 are located on the same side of the material guiding frame 4, and the shifting mechanism 6 and the material guiding frame 4 are respectively located on one side of the rotating shaft 31 close to the feeding port and on one side of the discharging port, or the shifting mechanism 6 and the material guiding frame 4 are respectively located on one side of the rotating shaft 31 close to the discharging port and on one side of the feeding port. The supporting elastic member 32 is preset to a compressed state so that the material guiding frame 4 always abuts against the shifting surface 631.

[0110] In an embodiment of the present invention, as Figures 8 to 12 shown, the material guiding frame 4 further includes a transmission pipe 44. The detection module 43 is further provided with an empty-load detector 432. The transmission pipe 44 is arranged at one end of the buffer sliding frame 42 away from the main body frame 41. The transmission pipe 44 is used to be connected with the printing module to transmit the wire material, and the triggering portion 425 can also be used to trigger the empty-load detector 432.

[0111] In this embodiment, the material passing channel 47 is communicated with the printing module through the transmission pipe 44. The wire material is transmitted from the material passing channel 47 to the printing module through the transmission pipe 44. The transmission pipe 44 can prevent the wire material from directly leaking outside between the printing material rack and the printing module, so as to protect the wire material. It can be understood that when the wire material feeds into the printing module, the wire material will move in the transmission pipe 44 from the printing material rack to the printing module, and the wire material will relatively rub against the transmission pipe 44 and drive the transmission pipe 44 to compress towards the printing module. At this time, if the wire material on the material tray is entangled or there are other problems resulting in the printing module running empty, the wire material will not move in the transmission pipe 44, thereby causing the transmission pipe 44 to rebound and push the buffer sliding frame 42 to move relative to the main body frame 41. The triggering portion 425 of the buffer sliding frame 42 triggers the empty-load detector 432. After the empty-load detector 432 is triggered, the detection module 43 receives an empty-load signal and warns the user to stop the operation of the printing module. The user can timely check for problems and avoid the printing module continuing to run empty.

[0112] The trigger part 425 is used to trigger the no-load detector 432. When the trigger part 425 approaches or contacts the no-load detector 432, the no-load detector 432 is in a triggered state; when the trigger part 425 moves away from the full-load detector 431, the no-load detector 432 is in an untriggered state.

[0113] Specifically, the no-load detector 432 can be set as a non-contact sensor such as a photoelectric sensor or an electromagnetic sensor for detecting in place. When the trigger part 425 enters the detection range of the no-load detector 432 and is detected by the no-load detector 432, the no-load detector 432 is triggered by the trigger part 425. Correspondingly, when the trigger part 425 leaves the detection range of the no-load detector 432, the no-load detector 432 is in an untriggered state; or, the no-load detector 432 is set as a contact sensor such as a piezoelectric sensor or a mechanical limit sensor for detecting in place. When the trigger part 425 contacts or presses against the trigger end of the no-load detector 432, the no-load detector 432 is triggered by the trigger part 425. Correspondingly, when the trigger part 425 leaves the trigger end of the no-load detector 432, the no-load detector 432 is in an untriggered state.

[0114] Furthermore, during feeding, if the speed at which the feeding and discharging device 200 drives the wire material is greater than the speed at which the extrusion assembly drives the wire material, at this time, the feeding and discharging device 200 will feed a section of wire material into the second channel 422 more. The wire material accumulates at the transmission pipe 44 and pushes the transmission pipe 44 to drive the buffer sliding frame 42 to move, so that the trigger part 425 triggers the full-load detector 431.

[0115] It can be understood that when the transmission pipe 44 pushes the buffer sliding frame 42 to trigger the no-load detector 432, the buffer sliding frame 42 moves in the direction close to the main body frame 41. Therefore, the full-load detector 431 and the no-load detector 432 of the detection module 43 are respectively arranged close to the discharge port and the feed port. When the printing material rack and the printing module are feeding normally, the trigger part 425 of the buffer sliding frame 42 is located between the full-load detector 431 and the no-load detector 432. The specific positions of the full-load detector 431 and the no-load detector 432 can be set according to the positions of the trigger part 425 of the buffer sliding frame 42 during full load and no load.

[0116] Both the full-load detector 431 and the no-load detector 432 can be set as non-contact trigger sensors, such as photoelectric switches, proximity switches, etc., or can also be contact trigger sensors, such as piezoelectric sensors, etc.

[0117] In this embodiment, the no-load detector 432 is set as an opposed photoelectric switch. The opposed photoelectric switch includes a transmitter and a receiver. When the trigger part 425 extends between the transmitter and the receiver, the opposed photoelectric switch is triggered.

[0118] Optionally, the transmission pipe 44 can be a Teflon pipe or a silicone rubber pipe, etc.

[0119] Optionally, two sets of trigger portions 425 of the buffer carriage 42 may be provided. The two sets of trigger portions 425 are respectively provided corresponding to the full-load detection member 431 and the no-load detection member 432. In this way, when the moving stroke of the buffer carriage 42 at full load and no load is short, the full-load detection member 431 and the no-load detection member 432 can be arranged at a relatively large distance from each other to avoid false triggering of the full-load detection member 431 or the no-load detection member 432.

[0120] Optionally, the full-load detection member 431 and the no-load detection member 432 may be integrated on the same detection circuit board. The detection circuit board is connected to the main body frame 41 through a bracket 2 or screws, etc., and the connection structure between the detection circuit board and the main body frame 41 is arranged at one end of the detection circuit board away from the buffer carriage 42 to avoid hindering the sliding of the buffer carriage 42.

[0121] In an embodiment of the present invention, as Figures 8 to 13 shown, the material guiding frame 4 further includes a spring piece 45. The spring piece 45 is connected to the main body frame 41 and encloses a limiting space 46 with the main body frame 41. At least part of the buffer carriage 42 is movably limited in the limiting space 46.

[0122] In this embodiment, the buffer carriage 42 is limited in the limiting space 46 to limit the movable stroke of the buffer carriage 42 relative to the main body frame 41 and prevent the buffer carriage 42 from detaching from the main body frame 41. It can be understood that the movable stroke of the buffer carriage 42 should be correspondingly set according to the distance between the full-load detection member 431 and the no-load detection member 432, and the moving stroke of the buffer carriage 42 driving the trigger portion 425 at least covers the full-load detection member 431 and the no-load detection member 432. Optionally, the buffer carriage 42 limited in the limiting space 46 abuts against the inner wall of the limiting space 46 at both the starting point and the ending point of the stroke for limiting.

[0123] It can be understood that there may be multiple spring pieces 45, which are arranged along the circumference of the buffer carriage 42 to enclose a plurality of spaced-apart limiting spaces 46, or the spring piece 45 and the main body frame 41 enclose a limiting space 46 surrounding the circumference of the buffer carriage 42, thereby improving the uniformity of the force when the buffer carriage 42 abuts against the inner wall of the limiting space 46 for limiting and preventing the buffer carriage 42 from being skewed and unable to slide relative to the main body frame 41 normally.

[0124] In an embodiment of the present invention, as Figures 8 to 13As shown, the trigger part 425 is movably limited within the limiting space 46. The elastic piece 45 is disposed between the detection module 43 and the main body frame 41. The elastic piece 45 at least includes a first bent protrusion 453 and a second bent protrusion 454. Both the first bent protrusion 453 and the second bent protrusion 454 protrude towards the main body frame 41. A first extending part 451 is provided on the side of the first bent protrusion 453 facing away from the limiting space 46, and a second extending part 452 is provided on the side of the second bent protrusion 454 facing away from the limiting space 46. The trigger part 425 is configured to press against the first bent protrusion 453 or the second bent protrusion 454, so that the first extending part 451 triggers the full-load detection piece 431 or the second extending part 452 triggers the no-load detection piece 432.

[0125] In this embodiment, the trigger part 425 does not directly trigger the full-load detection piece 431 and the no-load detection piece 432, but presses against the first bent protrusion 453 and the second bent protrusion 454 to enable the first extending part 451 and the second extending part 452 to trigger the full-load detection piece 431 and the no-load detection piece 432. In this way, the elastic piece 45 not only has the function of limiting and buffering the sliding frame 42, but also has the function of triggering the full-load detection piece 431 and the no-load detection piece 432. The first bent protrusion 453 and the second bent protrusion 454 protrude towards the main body frame 41 to facilitate the trigger part 425 to press against the first bent protrusion 453 and the second bent protrusion 454.

[0126] It can be understood that the position of the trigger part 425 of the buffer sliding frame 42 relative to the main body frame 41 at no-load and full-load can be set as the starting point and the ending point of the movable stroke of the trigger part 425. When the trigger part 425 is at the starting point and the ending point of the movable stroke, it will abut against and be limited by the elastic piece 45, and at this time, the no-load detection piece 432 and the full-load detection piece 431 can be just triggered. In this embodiment, both the full-load detection piece 431 and the no-load detection piece 432 are set as opposed type photoelectric switches. The opposed type photoelectric switch includes a transmitter and a receiver. When the first extending part 451 or the second extending part 452 extends between the transmitter and the receiver, the opposed type photoelectric switch is triggered. The first extending part 451 and the second extending part 452 are set corresponding to the starting point and the ending point of the movable stroke of the trigger part 425. Thus, when the trigger part 425 presses against the elastic piece 45 at the starting point position, the first extending part 451 will extend between the generator and the receiver of the opposed type photoelectric switch, and then trigger the full-load detection piece 431; when the trigger part 425 presses against the elastic piece 45 at the ending point position, the second extending part 452 will extend between the generator and the receiver of the opposed type photoelectric switch, and then trigger the no-load detection piece 432.

[0127] Furthermore, the limiting space 46 is located on the side of the elastic piece 45 facing away from the detection module 43. In this way, the elastic piece 45 also plays a certain protective role for the detection module 43, preventing the buffer sliding frame 42 from rubbing against the detection module 43 when the buffer sliding frame 42 moves relative to the main body frame 41, or preventing other parts of the buffer sliding frame 42 except the triggering part 425 from accidentally touching the full-load detection piece 431 and the no-load detection piece 432. At the same time, the first protruding part 451 and the second protruding part 452 can be arranged close to the full-load detection piece 431 and the no-load detection piece 432 to improve the sensitivity of the full-load detection piece 431 and the no-load detection piece 432.

[0128] Optionally, the elastic piece 45 can be an elastomer. When the triggering part 425 presses against the elastic piece 45, the elastic piece 45 undergoes elastic deformation, which is beneficial for the first protruding part 451 or the second protruding part 452 to move towards the full-load detection piece 431 or the no-load detection piece 432 to trigger the full-load detection piece 431 or the no-load detection piece 432.

[0129] Optionally, the triggering part 425 protrudes towards the detection module 43. In order to reduce the weight of the triggering part 425 and balance the center of gravity of the buffer sliding frame 42 so that the buffer sliding frame 42 can slide more smoothly, holes are provided on the triggering part 425.

[0130] In actual implementation, the first bending protrusion 453, the second bending protrusion 454, the first protruding part 451 and the second protruding part 452 can be formed by bending the elastic piece 45.

[0131] In an embodiment of the present invention, the elastic piece 45 further includes a mounting plate 455. The first bending protrusion 453 and the second bending protrusion 454 are connected to both sides of the mounting plate 455. The mounting plate 455 is provided with a through hole 4551, and the main body frame 41 is provided with a mounting hole 414. The mounting plate 455 and the main body frame 41 are connected by screws through the through hole 4551 and the mounting hole 414.

[0132] In this embodiment, the mounting plate 455 is screwed to the main body frame 41 so that the elastic piece 45 is spaced from the main body frame 41. The first bending protrusion 453 and the second bending protrusion 454 are connected to both sides of the mounting plate 455 and are suspended, so as to be pressed and deformed by the triggering part 425.

[0133] Optionally, the mounting hole 414 can be a threaded hole. The main body frame 41 can be provided with a mounting post 413. The mounting hole 414 is provided on the mounting post 413. The end face of the mounting post 413 abuts against the mounting plate 455. Then, the screw rod of the screw passes through the through hole 4551 of the mounting plate 455 and is connected to the mounting hole 414 to limit the mounting plate 455 between the mounting post 413 and the nut of the screw. Optionally, the main body frame 41 can also be provided with a positioning pin 415. The mounting plate 455 is provided with a positioning hole 4552 corresponding to the positioning pin 415. When installing the elastic sheet 45, the positioning pin 415 passes through the positioning hole 4552 to facilitate the positioning and installation of the elastic sheet 45.

[0134] Optionally, the mounting plate 455 is arranged parallel to the sliding direction of the buffer sliding frame 42 to avoid abutting against the buffer sliding frame 42 and increasing the resistance when the buffer sliding frame 42 slides. The connecting parts 1311 of the first bending protrusion 453 and the mounting plate 455 and the connecting parts 1311 of the second bending protrusion 454 and the mounting plate 455 are both inclined from the mounting plate 455 towards the main body frame 41 to guide the triggering part 425.

[0135] Optionally, the connection structure between the control module and the main body frame 41 is similar to the connection structure between the mounting plate 455 and the main body frame 41. Positioning is achieved through the positioning pin 415 and the positioning hole 4552, and screw connection is achieved through the cooperation of the mounting post 413 and the mounting hole 414, so that the control module and the main body frame 41 are arranged at intervals to avoid hindering the sliding of the buffer sliding frame 42.

[0136] In an embodiment of the present invention, as Figures 8 to 12 shown, the buffer sliding frame 42 is provided with an avoidance channel 426. The extending direction of the avoidance channel 426 is the same as the extending direction of the main body frame 41. The avoidance channel 426 is used to avoid the connection structure between the mounting plate 455 and the main body frame 41.

[0137] In this embodiment, when the buffer sliding frame 42 is movably connected to the main body frame 41, the connection structure between the mounting plate 455 and the main body frame 41, such as the mounting post 413 and the positioning pin 415, etc., penetrates into the avoidance channel 426 to avoid the connection structure between the mounting plate 455 and the main body frame 41 from hindering the normal sliding of the buffer sliding frame 42. At the same time, the extending direction of the avoidance channel 426 is the same as the moving direction of the buffer sliding frame 42. The connection structure between the mounting plate 455 and the main body frame 41 can also abut against and be limited by the inner wall of the avoidance channel 426. In this way, the connection structure and the avoidance channel 426 cooperate to guide the sliding of the buffer sliding frame 42.

[0138] In an embodiment of the present invention, as Figures 8 to 12As shown, the buffer sliding bracket 42 includes a protruding portion 421 and a sleeved portion 423 connected to each other. The protruding portion 421 is provided with a second channel 422, and the sleeved portion 423 is provided with a limiting cavity 424 communicating with the second channel 422. The main body bracket 41 is provided with a protruding tube 416 and a limiting step 417. The limiting step 417 is limited in the limiting cavity 424, and at least part of the protruding tube 416 extends into the second channel 422.

[0139] In this embodiment, the buffer sliding bracket 42 is arranged above the main body bracket 41 and is naturally sleeved on the main body bracket 41 under the action of gravity. At the same time, the limiting step 417 of the main body bracket 41 is limited in the limiting cavity 424, and the bottom wall of the limiting cavity 424 is configured to be in limiting abutment with the limiting step 417 to limit the lowest position of the buffer sliding bracket 42 relative to the main body bracket 41. The protruding tube 416 forms a part of the first channel 411. The protruding tube 416 extends into the second channel 422 through the limiting cavity 424, so that the first channel 411 and the second channel 422 communicate to form a material passing channel 47.

[0140] During actual implementation, a transmission tube 44 can be arranged at one end of the protruding portion 421 away from the sleeved portion 423, and the transmission tube 44 and the protruding tube 416 can be Teflon tubes. A triggering portion 425 is arranged at one end of the sleeved portion 423 away from the protruding portion 421 to facilitate cooperation with the detection module 43 and the elastic sheet 45 connected to the main body bracket 41.

[0141] Optionally, the limiting step 417 is arranged around the protruding tube 416. The cross-sectional shape of the limiting cavity 424 is the same as that of the limiting step 417, and neither of them is circular to prevent the buffer sliding bracket 42 from rotating relative to the main body bracket 41 and affecting the material transmission effect of the second channel 422 on the wire material.

[0142] It can be understood that when the buffer sliding bracket 42 slides relative to the main body bracket 41, the protruding tube 416 also slides relatively in the second channel 422, and the limiting step 417 slides relatively in the limiting cavity 424.

[0143] In an embodiment of the present invention, as Figures 8 to 12 shown, the feeding and discharging device 200 further includes a blanking detection mechanism 7. The blanking detection mechanism 7 includes a blanking elastic member 71 and a pressing member 72. The pressing member 72 is elastically connected to the material guiding bracket 4 through the blanking elastic member 71 and at least part of it extends into the material passing channel 47. The detection module 43 is further provided with a blanking detection member 433, and the pressing member 72 is used to trigger the blanking detection member 433.

[0144] In this embodiment, when the wire material penetrates into the material passing channel 47, under the limitation of the wall of the material passing channel 47, the wire material continuously presses against the pressing member 72, causing the material breaking elastic member 71 to undergo elastic deformation. At the same time, the pressing member 72 moves towards the material breaking detection member 433 to continuously trigger the material breaking detection member 433, and the detection module 43 determines that there is wire material in the material passing channel 47. When the wire material leaves the material passing channel 47, the pressing member 72 loses the pressing force of the wire material, and the material breaking elastic member 71 rebounds to restore its original state, driving the pressing member 72 away from the material breaking detection member 433, and the material breaking detection switch is not triggered. At this time, the material breaking detection mechanism 7 determines that there is no wire material in the material passing channel 47.

[0145] It can be understood that a material breaking detection mechanism 7 is correspondingly provided for each material guiding frame 4 to detect the wire material situation in each material passing channel 47.

[0146] Optionally, the material breaking detection member 433 is a non-contact triggering sensor, such as a photoelectric switch, a proximity switch, etc., or it can also be a contact triggering sensor, such as a piezoelectric sensor, etc. The material breaking detection member 433 and the material passing channel 47 are respectively located on both sides of the pressing member 72. One end of the material breaking elastic member 71 is connected to the material guiding frame 4, and the other end is connected to the pressing member 72. In the initial state of the pressing member 72, that is, the state without being pressed by the wire material, the pressing member 72 at least partially extends into the material passing channel 47 for the wire material to press against.

[0147] In this embodiment, the material breaking detection member 433 is set as a transmissive photoelectric switch. The transmissive photoelectric switch includes a transmitter and a receiver. When the pressing member 72 enters between the transmitter and the receiver, the material breaking detection member 433 is triggered.

[0148] During actual implementation, the control module can be electrically connected to the shifting mechanism 6 and the feeding and discharging mechanism 5. When loading a material guiding frame 4, the user penetrates the wire material into the material passing channel 47, causing the wire material to press against the pressing member 72 and triggering the material breaking detection member 433. Then, the shifting mechanism 6 switches the material guiding frame 4 to the material moving state, and the feeding and discharging mechanism 5 drives the shifting surface 631 to drive the wire material to move and feed, so that the wire material completely enters the material passing channel 47 for subsequent automatic entry into the printing device.

[0149] In an embodiment of the present invention, as Figures 8 to 12 shown, the feeding and discharging device 200 further includes a mileage detection mechanism 8. The mileage detection mechanism 8 includes a mileage detection wheel 81 and a mileage detection gear 82. The mileage detection switch is connected to the material guiding frame 4. The mileage detection wheel 81 is rotatably connected to the material guiding frame 4 and at least partially extends into the material passing channel 47. The mileage detection gear 82 rotates synchronously with the mileage detection wheel 81. The detection module 43 is also provided with a mileage detection member 434, and the mileage detection gear 82 is used to trigger the mileage detection member 434.

[0150] In this embodiment, when the wire material moves in the material passing channel 47, it drives the mileage detection wheel 81 to rotate. At the same time, the mileage detection gear 82 rotates synchronously with the mileage detection wheel 81. The teeth on the mileage detection gear 82 can trigger the mileage detection member 434. The mileage detection mechanism 8 can judge the number of rotations of the mileage detection gear 82 by the number of times the mileage detection switch is triggered, and then judge the number of rotations of the wire material driving the mileage detection wheel 81. Then, according to the circumference of the mileage detection wheel 81, the length of the wire material movement is judged. Among them, the number of rotations may not be a positive integer. The more teeth on the mileage detection gear 8273, the higher the mileage detection accuracy.

[0151] In this embodiment, the mileage detection member 434 is set as an opposed type photoelectric switch. The opposed type photoelectric switch includes a transmitter and a receiver. When the gear of the mileage detection gear 82 passes between the transmitter and the receiver once, the mileage detection member 434 is triggered once.

[0152] Optionally, the mileage detection wheel 81 and the extrusion surface 531 are arranged oppositely, so that the mileage detection wheel 81 and the extrusion surface 531 can relatively press against the wire material, improve the pressing force on the wire material, and avoid the wire material from slipping during the movement in the material passing channel 47.

[0153] In actual implementation, the mileage detection wheel 81 and the mileage detection gear 82 are fixedly sleeved on the same connecting shaft, and the connecting shaft is rotatably connected to the material guiding frame 4, so that the mileage detection wheel 81 and the mileage detection gear 82 can rotate synchronously. Optionally, the mileage detection switch is a non-contact trigger sensor, such as a photoelectric switch, a proximity switch, etc., or it can also be a contact trigger sensor, such as a piezoelectric sensor, etc.

[0154] In one embodiment, the material breakage detection mechanism 7 and the mileage detection mechanism 8 are arranged on the same detection circuit board. The detection circuit board can be arranged on the housing 3 or connected to the material guiding frame 4, and no specific limitation is made here.

[0155] In one embodiment of the present invention, as Figure 1 、 Figure 14 and Figure 15 shown, the reel support shaft 1 includes a fixed shaft 11, a reel cylinder 12 and a resistance assembly 13. The fixed shaft 11 is connected to the bracket 2. The reel cylinder 12 is sleeved on the fixed shaft 11 and is configured to rotate relative to the fixed shaft 11. The resistance assembly 13 includes a first connecting member 131 and a second connecting member 132 that abut against each other. The first connecting member 131 is connected to the fixed shaft 11, and the second connecting member 132 is elastically connected to the reel cylinder 12 through an elastic member 14.

[0156] Understandably, the wire material is generally wound around the spool in a roll. The spool is installed on the rotating shaft 1 of the spool holder. The wire material on the spool is fed into the printing device of the 3D printer and is pulled by the extrusion mechanism in the printing device for feeding. The spool will rotate as the wire material is pulled.

[0157] In this embodiment, the spool cylinder 12 is sleeved on the fixed shaft 11 so that the spool cylinder 12 can rotate around the fixed shaft 11. When the rotating shaft 1 of the spool holder is in use, the spool is fixedly sleeved on the spool cylinder 12. When the wire material on the spool is pulled for feeding, the spool will drive the spool cylinder 12 to rotate around the fixed shaft 11 and drive the elastic member 14 to gradually deform. The elastic member 14 is connected to the second connecting member 132. The first connecting member 131 is connected to the fixed shaft 11 and abuts against the second connecting member 132, and there is a frictional resistance between the two to prevent the relative rotation of the first connecting member 131 and the second connecting member 132. Therefore, when the spool cylinder 12 starts to rotate, the elastic force of the elastic member 14 is not enough to overcome the frictional resistance between the second connecting member 132 and the first connecting member 131, and the second connecting member 132 will remain stationary until the spool cylinder 12 continuously drives the elastic member 14 to deform and the elastic force formed by the deformation of the elastic member 14 overcomes the frictional resistance between the second connecting member 132 and the first connecting member 131. After that, the spool cylinder 12 can drive the second connecting member 132 to rotate around the fixed shaft 11 by any angle through the elastic member 14 to unwind the wire material wound on the spool. When the wire material is retracted, the wire material loses tension and is in a relaxed state. At this time, the wire material no longer drives the spool cylinder 12 to rotate around the fixed shaft 11. Correspondingly, the elastic member 14 starts to rebound and drives the spool cylinder 12 to rotate in the opposite direction to rewind the wire material on the spool until the elastic member 14 returns to its initial state. In this way, when the extrusion mechanism and the feeding and retracting mechanism 5 retract the wire material, the spool will correspondingly rotate back by the length of the wire material exiting the extrusion mechanism and the feeding and retracting mechanism 5, so that the wire material always remains in a tensioned state, and the wire material is tightly wound on the spool, avoiding the wire material on the spool from becoming loose or winding outside the spool, which affects the subsequent feeding of the wire material.

[0158] In actual implementation, the spool has a mounting hole, and the spool cylinder 12 passes through the mounting hole so that the spool is sleeved on the spool cylinder 12.

[0159] Optionally, the fixed shaft 11 can be connected to the bracket 2 by a detachable connection method such as a buckle 152 or a screw, etc., and is fixed on the bracket 2 and is in a relatively stationary state with the bracket 2. The fixed shaft 11 can be a smooth shaft with a smooth circumferential surface to reduce the resistance of the spool cylinder 12 rotating around the fixed shaft 11. Understandably, the fixed shaft 11 and the spool cylinder 12 are coaxially arranged. The fixed shaft 11 is connected to the mounting surface of the bracket 2, and the mounting surface is perpendicular to the extending direction of the fixed shaft 11 to prevent the spool from rubbing against the mounting surface of the spool when rotating, resulting in an increase in the rotation resistance of the spool and affecting the smoothness of the wire material feeding and retracting.

[0160] Optionally, a reinforcing rib structure is provided inside the tray cylinder 12 to improve the structural strength of the tray cylinder 12. The materials of the fixed shaft 11 and the tray cylinder 12 are preferably plastic materials with low friction and high wear resistance, such as polyoxymethylene or nylon.

[0161] In an embodiment of the present invention, as Figure 15 and Figure 22 shown, the first connecting member 131 is connected to the end of the fixed shaft 11 away from the bracket 2, the second connecting member 132 is provided at the end of the tray cylinder 12 away from the bracket 2, one end of the elastic member 14 is connected to the tray cylinder 12, the other end of the elastic member 14 is connected to the second connecting member 132, and the tray cylinder 12 and the second connecting member 132 are limited between the first connecting member 131 and the bracket 2.

[0162] In this embodiment, the first connecting member 131 and the second connecting member 132 are respectively provided at the ends of the fixed shaft 11 and the tray cylinder 12 to avoid interfering with the relative rotation of the tray cylinder 12 and the fixed shaft 11. The tray cylinder 12 is limited between the first connecting member 131 and the other end of the fixed shaft 11 to prevent the tray cylinder 12 from sliding along the extension direction of the fixed shaft 11 and affecting the stability of the tray placement. It can be understood that the first connecting member 131 and the second connecting member 132 are in close contact, so that a frictional resistance can be generated between the first connecting member 131 and the second connecting member 132.

[0163] In actual implementation, the second connecting member 132 is provided in a sheet shape. The second connecting member 132 is disposed between the tray cylinder 12 and the first connecting member 131 and is simultaneously pressed by the tray cylinder 12 and the first connecting member 131, so that the first connecting member 131 and the second connecting member 132 can be in close contact. The second connecting member 132 is also provided with a through hole through which the fixed shaft 11 can pass, so that the fixed shaft 11 can be connected to the first connecting member 131. Optionally, rubber pads or raised patterns can be correspondingly provided on the opposing abutting surfaces 6311 of the first connecting member 131 and the second connecting member 132 to increase the friction coefficient between the first connecting member 131 and the second connecting member 132.

[0164] Optionally, a limiting protrusion 1321 can be provided on the second connecting member 132, and the tray cylinder 12 and the second connecting member 132 can be limited between the first connecting member 131 and the limiting protrusion 1321.

[0165] In this embodiment, the elastic member 14 is a torsion spring. The first end and the second end of the torsion spring are respectively connected to the tray cylinder 12 and the second connecting member 132. It can be understood that the torsion spring is coaxially arranged with the tray cylinder 12. During feeding, if the rotation direction of the tray cylinder 12 is the same as the winding direction of the torsion spring, the tray cylinder 12 will drive the torsion spring to be compressed. If the rotation direction of the tray cylinder 12 is opposite to the winding direction of the torsion spring, the tray cylinder 12 will drive the torsion spring to be stretched. During discharging, the torsion spring rebounds to drive the tray cylinder 12 to rotate back and tension the wire material.

[0166] Optionally, the elastic member 14 can also be a coil spring. The inner side of the coil spring is connected to the tray cylinder 12, and the outer side of the coil spring is connected to the second connecting member 132. The coil spring can also drive the tray cylinder 12 to rotate back.

[0167] In an embodiment of the present invention, as Figures 14 to 16 shown, the tray cylinder 12 is provided with a through cavity 124. The fixed shaft 11 passes through the through cavity 124. The cavity wall of the through cavity 124 is provided with a placement step 1241 and a notch 1242. The torsion spring is limited between the placement step 1241 and the second connecting member 132, and the first end of the torsion spring is limited in the notch 1242.

[0168] In this embodiment, the placement step 1241 is located in the through cavity 124 and is arranged at one end of the through cavity 124 away from the bracket 2. The second connecting member 132 can cover the cavity opening at one end of the through cavity 124 away from the bracket 2 to prevent the torsion spring from being exposed, thereby reducing the erosion of the torsion spring and prolonging the service life of the torsion spring. At the same time, the aesthetic degree of the tray rack rotating shaft 1 is also improved. The first end of the torsion spring is limited in the notch 1242 on the cavity wall of the through cavity 124 and can rotate with the tray cylinder 12.

[0169] Optionally, both sides of the torsion spring can respectively abut against the placement step 1241 and the second connecting member 132 to ensure the installation stability of the torsion spring. At the same time, the torsion spring can also apply an elastic force to the second connecting member 132 towards the first connecting member 131 to make the second connecting member 132 and the second connecting member 132 closely abut. In actual implementation, the torsion spring can be sleeved on the fixed shaft 11.

[0170] In an embodiment of the present invention, as Figure 20 shown, a limiting protrusion 1321 is provided on the side of the second connecting member 132 facing the tray cylinder 12. The limiting protrusion 1321 encloses to form a limiting groove 1322, and the second end is limited in the limiting groove 1322.

[0171] In this embodiment, the limiting protrusion 1321 can be arranged in a ring shape, or can be arranged in an L shape to enclose to form the limiting groove 1322. The second end of the torsion spring is limited in the limiting groove 1322 and rotates with the second connecting member 132. This is beneficial to reducing the assembly difficulty of the torsion spring and reducing the production cost of the tray rack rotating shaft 1.

[0172] It can be understood that the notch of the limiting groove 1322 is arranged in the direction opposite to the torsion direction of the torsion spring. When the torsion spring is driven by the material tray cylinder 12 to twist, the second end of the torsion spring abuts against the groove wall of the limiting groove 1322 for limiting.

[0173] In an embodiment of the present invention, as Figure 15 and Figure 21 shown, the resistance assembly 13 further includes a pressing elastic sheet 133. The pressing elastic sheet 133 is arranged between the first connecting member 131 and the second connecting member 132 and is used for pressing the first connecting member 131 and the second connecting member 132.

[0174] In this embodiment, a pressing elastic sheet 133 is further arranged between the first connecting member 131 and the second connecting member 132. The first connecting member 131 and the second connecting member 132 are further stably held against each other through the pressing elastic sheet 133. The first connecting member 131 and the second connecting member 132 press the pressing elastic sheet 133 from both sides of the pressing elastic sheet 133, and the pressing elastic sheet 133 has elasticity and can stably and continuously apply pressure to the first connecting member 131 and the second connecting member 132 so as to generate a stable rotational resistance between the first connecting member 131 and the second connecting member 132.

[0175] Optionally, the pressing elastic sheet 133 can be replaced with a spring sheet, a leaf spring or a compression spring. The pressing elastic sheet 133 can be connected to the first connecting member 131 and keep stationary with the first connecting member 131 together. A frictional resistance that hinders the rotation of the second connecting member 132 is generated between the pressing elastic sheet 133 and the second connecting member 132. The pressing elastic sheet 133 can be connected to the second connecting member 132 and is configured to rotate relative to the first connecting member 131 together with the second connecting member 132. A frictional resistance that hinders the rotation of the second connecting member 132 is generated between the pressing elastic sheet 133 and the first connecting member 131.

[0176] During actual implementation, the pressing elastic sheet 133 can be provided with an opening through which the fixed shaft 11 passes, so as to facilitate the connection between the fixed shaft 11 and the first connecting member 131. At the same time, the pressing elastic sheet 133 can be sleeved on the fixed shaft 11 to ensure the stability of the installation of the pressing elastic sheet 133.

[0177] Optionally, the pressing elastic sheet 133 is provided with a plurality of elastic protrusions 1331, and the plurality of elastic protrusions 1331 are arranged at intervals along the circumferential direction of the pressing elastic sheet 133.

[0178] In this embodiment, the elastic protrusions 1331 are configured to increase the deformable stroke of the pressing elastic piece 133. The smaller the distance between the first connecting member 131 and the second connecting member 132, the greater the degree of compression of the elastic protrusions 1331. The plurality of elastic protrusions 1331 are arranged along the circumferential direction of the pressing elastic piece 133 to improve the uniformity of the force received by the first connecting member 131 and the second connecting member 132, so that when the second connecting member 132 rotates relative to the first connecting member 131 to any angle, the frictional resistance received by the second connecting member 132 remains unchanged, thereby improving the stability of the rotation of the material tray cylinder 12.

[0179] In actual implementation, the elastic protrusions 1331 can protrude only towards the first connecting member 131, or only towards the second connecting member 132, or can protrude towards both the first connecting member 131 and the second connecting member 132 at the same time. The plurality of elastic protrusions 1331 can be arranged at equal intervals along the circumferential direction of the pressing elastic piece 133, and the elastic protrusions 1331 can also be arranged in a ring shape along the circumferential direction of the pressing elastic piece 133.

[0180] In an embodiment of the present invention, as Figure 19 and Figure 21 shown, the pressing elastic piece 133 is connected to the second connecting member 132, and one of the second connecting member 132 and the pressing elastic piece 133 is provided with a positioning protrusion 1323, and the other is provided with a positioning groove 1332, and the positioning protrusion 1323 is limited in the positioning groove 1332.

[0181] In this embodiment, the pressing elastic piece 133 is connected to the second connecting member 132 and rotates with the second connecting member 132. The circumferential limit of the second connecting member 132 and the pressing elastic piece 133 is realized through the limiting cooperation of the positioning protrusion 1323 and the positioning groove 1332, so as to prevent the pressing elastic piece 133 and the second connecting member 132 from rotating relative to each other.

[0182] Optionally, the second connecting member 132 is provided with a positioning protrusion 1323, and the pressing elastic piece 133 is provided with a corresponding positioning groove 1332. The positioning protrusion 1323 and the positioning groove 1332 include multiple groups, and the multiple groups of positioning protrusions 1323 and positioning grooves 1332 are arranged at intervals along the circumferential direction of the second connecting member 132 and the pressing elastic piece 133.

[0183] In an embodiment of the present invention, as Figure 15 、 Figure 18 and Figure 22 shown, the first connecting member 131 includes a connecting portion 1311 and a abutting portion 1312 connected to each other. The fixed shaft 11 is provided with a connecting cavity 111. The connecting portion 1311 passes through the connecting cavity 111 and is connected to the fixed shaft 11, and the abutting portion 1312 abuts against the second connecting member 132.

[0184] In this embodiment, the connecting portion 1311 of the first connecting member 131 is inserted into the connecting cavity 111. Optionally, the connecting portion 1311 is rod-shaped or column-shaped. A clamping projection 1313 is provided on the connecting portion 1311, and the clamping projection 1313 is clamped on the side wall of the connecting cavity 111, so that the first connecting member 131 is detachably connected to the fixed shaft 11, preventing the connecting portion 1311 from coming out of the connecting cavity 111. The cross-sectional shape of the connecting cavity 111 is the same as that of the connecting portion 1311 and is not circular, preventing the first connecting member 131 from rotating relative to the fixed shaft 11.

[0185] The abutting portion 1312 is connected to one end of the connecting portion 1311 and is in a lid shape. The inner side of the abutting portion 1312 is arranged to cover the end of the material tray cylinder 12 to close the through cavity 124 of the material tray cylinder 12. At the same time, a snap structure 1314 is also provided on the inner side of the abutting portion 1312 to clamp and press the pressing elastic piece 133 and the second connecting member 132, playing a limiting role in the radial direction of the material tray cylinder 12 for the pressing elastic piece 133 and the second connecting member 132, so that the abutting portion 1312, the pressing elastic piece 133 and the second connecting member 132 are always aligned in the axial direction, facilitating the mutual pressing of the three. The abutting portion 1312 and the material tray cylinder 12 can be rotatably connected through the cooperation of an annular card slot and a snap 152. The annular card slot is arranged along the circumferential direction of the rotation of the material tray cylinder 12, and the snap 152 is snapped into the annular card slot and can move along the annular card slot.

[0186] It can be understood that the connecting portion 1311 does not completely extend into the connecting cavity 111, and the pressing elastic piece 133, the torsion spring and the second connecting member 132 can be sleeved on the connecting portion 1311, so that the distance between the abutting portion 1312 and the fixed shaft 11 can be adjusted, and further the frictional resistance between the abutting portion 1312 and the pressing elastic piece 133 can be adjusted to adapt to different usage requirements.

[0187] In an embodiment of the present invention, as Figure 15 、 Figure 17 and Figure 22 shown, the material tray rack rotating shaft 1 further includes a clamping claw 15. The material tray cylinder 12 is provided with an installation groove 123. At least part of the clamping claw 15 is movably limited in the installation groove 123 and is elastically connected to the material tray cylinder 12. The clamping claw 15 is configured to move radially along the material tray cylinder 12.

[0188] In this embodiment, the clamping jaws 15 are arranged to extend along the axial direction of the tray cylinder 12 and are used to clamp the inserted tray. The clamping jaws 15 are limited in the installation groove 123 to prevent the clamping jaws 15 from moving along the surface of the tray cylinder 12, thereby improving the stability of the clamping jaws 15 in fixing the tray. It can be understood that the clamping jaws 15 and the tray cylinder 12 are connected by an elastic member, and the direction of the elastic force of the elastic member is parallel to the radial direction of the tray cylinder 12. When the tray is sleeved on the clamping jaws 15, the clamping jaws 15 press against the elastic member along the radial direction of the tray cylinder 12, causing the elastic member to deform and release an elastic force along the radial direction of the tray cylinder 12 to the clamping jaws 15, so that the clamping jaws 15 tightly press against the tray and the tray is fixed on the tray cylinder 12. It can be understood that part of the tray cylinder 12 is limited in the installation groove 123 and part of it extends out of the installation groove 123 to press against the tray.

[0189] When installing the tray, the clamping jaws 15 and the tray are in interference fit so that the tray is fixedly sleeved on the tray cylinder 12 and drives the tray cylinder 12 to rotate synchronously. The clamping jaws 15 can be elastically connected to the tray cylinder 12 by a spring. When the tray cylinder 12 is sleeved outside the clamping jaws 15, the spring is in a compressed state so that the clamping jaws 15 tightly press against the tray, and thus the tray can drive the tray cylinder 12 to rotate. Optionally, there can be multiple clamping jaws 15, and the multiple clamping jaws 15 are arranged at intervals along the circumferential direction of the tray cylinder 12 to improve the uniformity of the force on the tray and the stability of the tray in driving the tray cylinder 12 to rotate.

[0190] In actual implementation, the tray cylinder 12 includes an inner cylinder 122 and an outer cylinder 121. The outer cylinder 121 is sleeved on the inner cylinder 122 and is connected to the inner cylinder 122 by connecting ribs extending along the axial direction of the tray cylinder 12. The inner cylinder 122 encloses a through cavity 124 for the fixed shaft 11 to pass through, and the fixed shaft 11 has a clearance fit with the inner wall of the through cavity 124. An installation groove 123 is formed between the outer cylinder 121 and the inner cylinder 122. The outer cylinder 121 is provided with a slot opening of the installation groove 123 for the clamping jaws 15 to penetrate and a side wall of the installation groove 123 extending towards the inner cylinder 122. The inner cylinder 122 is provided with a flat part corresponding to the position of the installation groove 123, and the flat part serves as the bottom of the installation groove 123 to facilitate the installation of the clamping jaws 15. The flat part is provided with reinforcing ribs perpendicular to the axial direction of the tray cylinder 12 to strengthen the strength of the bottom of the installation groove 123.

[0191] It can be understood that one end of the elastic member is connected to the tray cylinder 12 and the other end abuts against the clamping jaws 15. The elastic member can be a compression spring, a tension spring, a spring sheet, etc. Optionally, an anti-slip pad is further provided on the surface of the clamping jaws 15 to increase the friction between the clamping jaws 15 and the tray and prevent the tray from moving relative to the clamping jaws 15.

[0192] Optionally, there are multiple clamping jaws 15, which are arranged at intervals along the circumferential direction of the tray cylinder 12. The elastic member is a jaw spring piece 16. The jaw spring piece 16 is sleeved on the inner cylinder 122 and abuts against the clamping jaw 15 in the radial direction of the tray cylinder 12. It can be understood that the side wall of the installation groove 123 is not completely closed, so that the jaw spring piece 16 can extend into the installation groove 123 to abut against the clamping jaw 15. The clamping jaw 15 is provided with a fixing groove 1521 corresponding to the jaw spring piece 16, and the jaw spring piece 16 is limited in the fixing groove 1521 to prevent the jaw spring piece 16 from being deflected.

[0193] In an embodiment of the present invention, as Figure 15 , Figure 16 and Figure 22 shown, a limiting post 1231 is provided on the bottom wall of the installation groove 123. The limiting post 1231 is provided with a limiting hole 1232, and the clamping jaw 15 is provided with a positioning post 151. The positioning post 151 is limited in the limiting hole 1232.

[0194] In this embodiment, the positioning post 151 and the limiting hole 1232 are in limiting cooperation to realize the positioning installation of the clamping jaw 15.

[0195] A bayonet 1233 is provided on the side wall of the installation groove 123. The clamping jaw 15 is provided with a buckle 152. The buckle 152 is limited in the bayonet 1233 and is configured to move in the bayonet 1233.

[0196] In this embodiment, the clamping jaw 15 is detachably connected through the cooperation of the buckle 152 and the bayonet 1233. Optionally, there are four buckles 152, which are arranged in pairs on both sides of the clamping jaw 15, and the side wall of the installation groove 123 is provided with bayonets 1233 corresponding to the buckles 152 one by one. In this way, the buckle 152 can be stably limited in the installation groove 123.

[0197] It can be understood that the clamping jaw 15 has a moving stroke in the radial direction of the tray cylinder 12. The limiting cooperation between the clamping jaw 15 and the limiting post 1231 can limit the lowest point of the moving stroke of the clamping jaw 15. The limiting cooperation between the buckle 152 and the bayonet 1233 can limit the highest point of the moving stroke of the clamping jaw 15.

[0198] Optionally, after the clamping jaw 15 is installed in the installation groove 123 and before the clamping jaw 15 sleeves the tray, the elastic member is always in a deformed state and applies an outward elastic force to the clamping jaw 15, so that the clamping jaw 15 is located at the highest point of the moving stroke. This avoids the loose state of the clamping jaw 15 in the installation groove 123 and the insecure fixing of the tray.

[0199] Optionally, a fixing groove 1521 for limiting the jaw spring piece 16 can be provided on the buckle 152.

[0200] In an embodiment of the present invention, the clamping jaw 15 at least includes a first section 153 and a second section 154 that are connected. The first section 153 is parallel to the axis of the material tray cylinder 12, and the second section 154 is connected to one end of the first section 153 close to the first connecting member 131 and is inclined towards the axis of the material tray cylinder 12.

[0201] In this embodiment, the material tray is installed from one end of the material tray cylinder 12 close to the first connecting member 131. The clamping jaw 15 includes a first section 153 and a second section 154. The second section 154 is connected to one end of the first section 153 close to the first connecting member 131. Therefore, during the installation process of the material tray, it is first sleeved on the second section 154 and then on the first section 153. In the present application, the second section 154 is inclined towards the axis of the material tray cylinder 12 gradually from the first section 153 towards the first connecting member 131, so that the second section 154 is tapered towards the first connecting member 131, that is, the cross-sectional area of the second section 154 gradually decreases from the end close to the first section 153 to the end close to the first connecting member 131. This is beneficial for the installation and disassembly of the consumable material tray. The first section 153 is arranged parallel to the axis of the material tray cylinder 12 to firmly fix the installed consumable material tray.

[0202] In actual implementation, the second sections 154 of multiple clamping jaws 15 are all inclined and close to the axis of the material tray cylinder 12.

[0203] The present invention also proposes a 3D printer, which includes a printing device and a feeding module. The specific structure of the feeding module refers to the above embodiment. Since this 3D printer adopts all the technical solutions of the above all embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, and will not be elaborated here one by one.

[0204] Among them, the printing module is provided with an extrusion channel, and the extrusion channel is communicated with the material passing channel 47 through a transmission pipe; the printing material rack is used for feeding and discharging materials to and from the extrusion channel, and the detection module is electrically connected to the printing module. When the no-load detection part on the detection module is triggered, the detection module transmits a stop signal to the printing module to make the printing module stop running, so as to facilitate the user to troubleshoot the faults or problems that cause the printing module to print without material.

[0205] In actual implementation, the bracket and the housing in the feeding module can be separately arranged from the printing device, or the bracket and the housing can also be installed on the frame of the printing device, and no specific limitation is made here.

[0206] The above description is only an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A feeding module, characterized in that: The feeding module comprises: A tray rack, the tray rack comprising a bracket and a plurality of tray rack shafts, the plurality of tray rack shafts being connected to the bracket at intervals, the tray rack shafts being used to place a tray carrying wire material; and A material feeding and withdrawing device, the material feeding and withdrawing device comprises a housing, a plurality of material guide racks, a material feeding and withdrawing mechanism and a shifting mechanism, the plurality of material guide racks are rotatably connected to the housing, each of the material guide racks is provided with a material passing channel, the material feeding and withdrawing mechanism is connected to the housing, the material feeding and withdrawing mechanism is provided with an extrusion surface, the extrusion surface is configured to drive the wire material in the material passing channel to move, the shifting mechanism is connected to the housing, the shifting mechanism is provided with a shifting surface, and the shifting surface is configured to abut against the material guide rack; Among them, the material tray rack rotating shaft and the material guide rack are arranged in a one-to-one correspondence, and the wire material on each material tray rack rotating shaft passes into a material transfer channel of the material guide rack. The shift mechanism drives the shift surface to drive the material guide rack to rotate, so that each material transfer channel has a material moving state in which the extrusion surface enters and a switching state in which the extrusion surface leaves.

2. The feeding module according to claim 1, characterized in that: The shift mechanism comprises a shift drive member, a shift transmission shaft and a plurality of shift wheels, wherein the shift transmission shaft is rotatably connected to the housing and connected to the output end of the shift drive member, and the plurality of shift wheels are sleeved on the shift transmission shaft at intervals, and each of the shift wheels is provided with a shift surface, and the shift surface comprises an abutment surface and an avoidance groove, and each of the avoidance grooves is provided corresponding to a material guide frame; The shift drive member drives the shift transmission shaft to rotate, thereby driving the shift wheel to rotate, so that the groove bottom or the abutment surface of the avoidance groove abuts against the material guide rack, and the material guide rack is in a material moving state or a switching state.

3. The feeding module according to claim 1, characterized in that: The feed and withdraw mechanism includes a feed and withdraw drive member, a feed and withdraw transmission shaft and a plurality of extrusion wheels. The feed and withdraw drive member is connected to the shell, the feed and withdraw transmission shaft is rotatably connected to the shell and connected to the output end of the feed and withdraw drive member, and a plurality of extrusion wheels are sleeved on the feed and withdraw transmission shaft at intervals, each of the extrusion wheels is arranged corresponding to a material transfer channel and is provided with the extrusion surface.

4. The feeding module according to any one of claims 1 to 3, characterized in that: The material guide frame comprises: A main frame, the main frame is rotatably connected to the shell, the main frame is provided with a first channel and a port connected to the first channel, the port is used for the extrusion surface to enter the first channel; A detection module, the detection module is connected to the main frame, and the detection module is provided with a full-load detection member; and A buffer sliding frame, wherein the buffer sliding frame is provided with a second channel, one end of the buffer sliding frame is movably connected to one end of the main frame so that the second channel is connected to the first channel to form the material transfer channel, and the buffer sliding frame is provided with a trigger part for triggering the full load detection part.

5. The feeding module according to claim 4, characterized in that: The housing is provided with a rotating shaft, and at least a portion of the main frame is rotatably sleeved on the rotating shaft; Wherein, the material guide frame has a first position and a second position; in the first position, the extrusion surface enters the first channel through the port, and the material transfer channel is in the material transfer state; in the second position, the extrusion surface leaves the first channel through the port, and the material transfer channel is in the switching state.

6. The feeding module according to claim 4, characterized in that: The material guide frame also includes a transmission tube, and the detection module is also provided with an empty-load detection component. The transmission tube is arranged at one end of the buffer sliding frame away from the main frame. The transmission tube is used to connect with the printing module to transmit the line material, and the trigger part can also be used to trigger the empty-load detection component.

7. The feeding module according to claim 6, characterized in that: The material guide frame also includes an elastic sheet, which is connected to the main frame and enclosed with the main frame to form a limiting space, and at least a part of the buffer sliding frame is movably limited in the limiting space.

8. The feeding module according to claim 7, characterized in that: The trigger part is movable and limited in the limit space, and the spring is arranged between the detection module and the main frame. The spring piece includes at least a first bending protrusion and a second bending protrusion, the first bending protrusion and the second bending protrusion are both protruding toward the main frame, a first extending portion is provided on the side of the first bending protrusion facing away from the limiting space, and a second extending portion is provided on the side of the second bending protrusion facing away from the limiting space, and the triggering portion is configured to press against the first bending protrusion or the second bending protrusion, so that the first extending portion triggers the full-load detection component or the second extending portion triggers the empty-load detection component.

9. The feeding module according to claim 4, characterized in that: The material feeding and withdrawing device also includes a material breakage detection mechanism, which includes a material breakage elastic member and a pressure member. The pressure member is elastically connected to the material guide frame through the material breakage elastic member, and the pressure member at least partially extends into the material passing channel. The detection module is also provided with a material breakage detection member, and the pressure member is used to trigger the material breakage detection member.

10. The feeding module according to claim 4, characterized in that: The feeding and withdrawing device also includes a mileage detection mechanism, which includes a mileage detection wheel and a mileage detection gear. The mileage detection wheel is rotatably connected to the material guide frame and at least partially extends into the material transfer channel. The mileage detection gear rotates synchronously with the mileage detection wheel. The detection module is also provided with a mileage detection component, and the mileage detection gear is used to trigger the mileage detection component.

11. The feeding module according to any one of claims 1 to 3, characterized in that: The material tray rack rotating shaft includes a fixed shaft, a material tray barrel and a resistance assembly, the fixed shaft is connected to the bracket, the material tray barrel is sleeved on the fixed shaft and is configured to rotate relative to the fixed shaft, the resistance assembly includes a first connecting member and a second connecting member that abut against each other, the first connecting member is connected to the fixed shaft, and the second connecting member is elastically connected to the material tray barrel via an elastic member.

12. The feeding module according to claim 11, characterized in that: The first connecting member is connected to one end of the fixed shaft away from the bracket, the second connecting member is arranged at one end of the material tray barrel away from the bracket, one end of the elastic member is connected to the material tray barrel, and the other end of the elastic member is connected to the second connecting member, and the material tray barrel and the second connecting member are limited between the first connecting member and the bracket.

13. The feeding module according to claim 11, characterized in that: The resistance assembly further includes a pressing spring sheet, which is disposed between the first connecting member and the second connecting member and is used to press the first connecting member and the second connecting member.

14. A 3D printer, characterized in that: The 3D printer comprises a printing device and a loading module as claimed in any one of claims 1 to 13.

Images