Discharging device and 3D printer

Abstract

The utility model discloses an emptying device and 3D printer, emptying device includes mounting frame and rotary frame, the rotary frame releases the material on the tray when rotating along the first direction, and the mounting frame and rotary frame are provided with backstop piece and mating piece between, the backstop piece has the backstop portion, and the mating piece has the backstop portion and the backstop portion. The stopping part can elastically abut against the matching piece in the direction perpendicular to the rotating center line so as to provide resistance when the rotating frame rotates in the first direction relative to the mounting frame. The matching piece is further provided with a blocking structure, and the blocking part is matched with the blocking structure to prevent the rotating frame from rotating in the second direction opposite to the first direction, so that it is guaranteed that the material disc can stably rotate in the single direction to release materials. And the problems of material winding, material scattering, even material breaking and the like caused by accidental rotation of the material disc are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of discharging device, and the 3D printer with the discharging device. BACKGROUND

[0002] In prior art, some strip or filament materials are usually wound on material tray, and the material is gradually unwound when the material tray rotates. In the field of 3D printing, continuous fibers are widely used, and when printing, resin enters the flow channel from the inlet and is gradually heated and melted, while the fiber enters the flow channel from another inlet and is wrapped by the molten resin, and then is extruded by the co-extrusion nozzle. In the 3D printer, the continuous fiber material is usually wound on the material tray, and the material is discharged when the material tray rotates. However, due to the large rigidity and good elasticity of the continuous fiber material itself, the material is easily scattered under the action of the material itself, which can also drive the material tray to rotate, causing a series of problems such as material winding, material scattering and even material breaking. SUMMARY

[0003] The utility model aims to provide a kind of discharging device to solve one or more problems of prior art.

[0004] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of a kind of discharging device, comprising mounting frame and rotating frame, the rotating frame at least includes the material tray for winding material of outer side peripheral part, the rotating frame can be rotationally arranged on the mounting frame about rotation center line, the rotating frame releases the material on the material tray when rotating in the first direction,

[0005] The discharging device further comprises a stopper and a cooperating piece, one of the stopper and the cooperating piece is provided on the mounting frame, and the other is provided on the rotating frame, wherein,

[0006] The stopper has a stopper portion that elastically abuts on the cooperating piece to provide resistance when the rotating frame rotates in the first direction relative to the mounting frame; the cooperating piece further has a blocking structure, and the stopper portion and the blocking structure cooperate to prevent the rotating frame from rotating in the second direction opposite to the first direction.

[0007] Preferably, the mounting frame comprises a fixed seat fixedly installed on the machine base, and the fixed seat has a mounting hole; the rotating frame comprises a rotating seat, and the material tray is fixedly installed on the rotating seat; the rotating seat has a rotating portion rotationally arranged in the mounting hole about the rotation center line; the stopper and the cooperating piece are arranged between the circumferential hole wall of the mounting hole and the outer side peripheral part of the rotating portion; and the stopper portion elastically abuts on the cooperating piece in the radial direction of the rotating portion or the mounting hole.

[0008] In some embodiments, the engaging member is a gear ring, the gear ring comprises a plurality of teeth arranged at intervals in a circumferential direction, a tooth gap is formed between two adjacent teeth, and the plurality of teeth constitute the blocking structure;

[0009] The stopper is an elastic arm, the elastic arm further has an engaging portion, the engaging portion and the stopper portion are arranged at different ends of the elastic arm in a length direction of the elastic arm, and the stopper portion is clamped in the tooth gap in a matching manner;

[0010] The engaging portion is fixedly engaged on one of the outer circumferential portion of the rotating portion and the circumferential hole wall of the mounting hole, the gear ring is fixedly arranged on the other one of the outer circumferential portion of the rotating portion and the circumferential hole wall of the mounting hole, and an oscillation space for the stopper portion to oscillate perpendicularly to the rotation center line is formed between the circumferential hole wall of the mounting hole and the outer circumferential portion of the rotating portion.

[0011] In some embodiments, the gear ring is fixedly arranged on the outer circumferential portion of the rotating portion, the elastic arm is arranged in the mounting hole, and the engaging portion is fixedly engaged on the circumferential hole wall of the mounting hole, wherein the elastic arm further comprises an arm main body between the engaging portion and the stopper portion, and a spacing is formed between the arm main body and the circumferential hole wall of the mounting hole.

[0012] In some embodiments, the arm main body is arc-shaped, the arc-shaped arm main body has the rotation center line as a center line, the engaging portion extends radially outward from one end of the arm main body, and the stopper portion extends radially inward from the other end of the arm main body.

[0013] In some embodiments, the stopper portion has a stopper surface and a sliding surface arranged at different sides in a thickness direction of the stopper portion, the tooth gap has a first slot wall and a second slot wall arranged oppositely, the first slot wall is perpendicular to the rotation center line, and the second slot wall is inclined to the rotation center line,

[0014] When the stopper portion is inserted into the tooth gap, the stopper surface cooperates with the first slot wall, and the sliding surface cooperates with the second slot wall, and when the tray rotates in the first direction, the cooperation between the sliding surface and the second slot wall enables the stopper portion to move from one tooth gap to another tooth gap.

[0015] In some embodiments, the rotating seat further comprises a limiting portion and a connecting portion, the connecting portion, the limiting portion and the rotating portion are sequentially connected in an axial direction, the limiting portion has an outer diameter larger than the outer diameter of the connecting portion and the outer diameter of the rotating portion, and the connecting portion is coaxial with the tray and is detachably fixedly connected.

[0016] In some embodiments, the connecting part comprises a cylindrical connecting body, and a plurality of ribs are arranged on the outer circumferential part of the connecting body, all the ribs extend along the axial direction of the connecting body, and all the ribs are uniformly distributed along the circumferential direction, and the connecting part is connected with the central hole of the tray through interference fit of the ribs.

[0017] In some embodiments, the stopper is arranged in a plurality of groups which are uniformly distributed in the circumferential direction around the rotation center line, and each group of stoppers is correspondingly matched with the blocking structure.

[0018] The utility model also provides a 3D printer which has the material discharging device as described above.

[0019] Due to the use of the above technical scheme, the utility model has the following advantages:

[0020] In the material discharging device, the stopper and the matching part are arranged between the rotating frame and the mounting frame, and when the stopper and the matching part are matched with each other, not only can the resistance when the rotating frame rotates relative to the mounting frame in the first direction be provided, but also the rotating frame can be prevented from rotating in the second direction opposite to the first direction, which not only enables the tray to rotate in the first direction only to discharge material, but also enables the rotating frame and the tray to be kept at the current position without external pulling force, so that the tray can be prevented from rotating accidentally, and problems such as winding, scattering and even breaking of the material can be avoided.

[0021] The 3D printer has the material discharging device as described above, is used for discharging continuous fiber filaments, ensures that the continuous fibers are discharged continuously in a single direction, and avoids problems such as winding, scattering and even breaking of the material, and meanwhile, the continuous fibers suffer small resistance during feeding, so that the continuous fiber filaments can be fed more smoothly into the flow channel of the 3D printer, and the accuracy of fiber filament laying and the occurrence of the blocking phenomenon can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme of the utility model, the drawings needed in the embodiment description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor.

[0023] Figure 1 It is a whole structure schematic view of the material discharging device of the utility model;

[0024] Figure 2 It is Figure 1An exploded view of the material feeding device.

[0025] Figure 3 for Figure 1 Side view of the feeding device;

[0026] Figure 4 For along Figure 3 Schematic diagram of the cross-sectional structure along the AA direction;

[0027] Figure 5 for Figure 1 A three-dimensional structural diagram of the central fixed base;

[0028] Figure 6 for Figure 5 A front view structural diagram of the fixing base;

[0029] Figure 7 for Figure 1 A partial structural diagram of the feeding device;

[0030] Figure 8 for Figure 7 A structural diagram from another perspective;

[0031] Figure 9 for Figure 7 A schematic diagram of the side view structure;

[0032] Figure 10 For along Figure 9 Schematic diagram of the cross-sectional structure along the BB direction;

[0033] Figure 11 for Figure 1 A three-dimensional structural diagram of the rotating seat in the feeding device;

[0034] Figure 12 for Figure 11 A front view structural diagram of the rotating base;

[0035] Figure 13 for Figure 12 Enlarged diagram of section C;

[0036] In the attached diagrams above:

[0037] 1. Base; 11. Positioning part; 2. Fixed base; 21. Fixed part; 22. Mating part; 23. Elastic arm (stop); 231. Joint part; 232. Stop part; 232a. Stop surface; 232b. Sliding surface; 233. Main body; 24. Mounting hole;

[0038] 3, rotating seat; 31, connecting part; 311, connecting body; 312, convex rib; 32, rotating part; 33, limiting part; 34, gear ring (mating piece); 341, tooth; 342, tooth groove; 343, first groove wall; 344, second groove wall;

[0039] 4, tray; 41, winding part; 42, center hole;

[0040] 5, end cover;

[0041] 6, rotating shaft; 7, bearing. DETAILED DESCRIPTION

[0042] The preferred embodiments of the present application will be described in detail with reference to the drawings, so that the advantages and features of the present application can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is used to help understand the present application, but does not constitute a limitation on the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0043] Figures 1 to 12 The drawings are drawn in true proportion, and in order to maintain the brevity of the specification, the proportions of the elements are not listed one by one, but the proportions and positions of the elements should be considered as part of the content of the specification.

[0044] Referring to Figures 1 to 4 A material releasing device for releasing material in the form of a filament or a strip, i.e. allowing the material in the form of a filament or a strip to be released from a tray as the tray rotates. The material releasing device specifically comprises a mounting frame and a rotating frame, the rotating frame at least comprising a tray 4, the outer circumferential portion of the tray 4 having a winding part 41 for winding the material, the rotating frame being rotatably arranged on the mounting frame about a rotating center line X, the rotating frame releasing the material wound on the outer circumferential portion of the tray 4 when rotating in a first direction.

[0045] The material releasing device further comprises a stopper and a mating piece, one of the stopper and the mating piece being arranged on the mounting frame and the other being arranged on the rotating frame, wherein the stopper has a stopper portion 232 which elastically abuts on the mating piece to provide resistance when the rotating frame rotates relative to the mounting frame, so as to avoid the rotating frame from accidentally rotating in the first direction to release the material; the mating piece further has a blocking structure, the stopper portion 232 and the blocking structure being capable of cooperating with each other to prevent the rotating frame from rotating in a second direction, the second direction being opposite to the first direction, e.g. if the first direction is clockwise, the second direction is counterclockwise, and vice versa.

[0046] Thus, when the feeding device is working, the material is released outwardly along with the rotation of the material disc 4 after overcoming the resistance formed by the friction between the blocking part 232 and the cooperating part under the action of the external pulling force, and the rotating frame rotates as a whole along the first direction around the rotation center line X; when the external pulling force is removed, the material disc 4 is limited to rotate in the first direction under the action of the blocking part 232 abutting against the cooperating part; at the same time, the material disc 4 is prevented from rotating in the second direction under the cooperation of the blocking part 232 and the blocking structure, so that the material disc 4 can only rotate in the first direction for feeding, and the rotating frame and the material disc 4 can be kept at the current position without external pulling force, avoiding accidental rotation of the material disc 4, thereby ensuring that the material disc 4 can stably rotate in a single direction to release the material, avoiding problems such as entanglement, scattering and even breakage of the material caused by accidental rotation of the material disc 4.

[0047] When the feeding device is used for feeding the continuous fiber filament in the 3D printer, the continuous fiber filament is wound on the material disc 4, and one end of the continuous fiber extends into the flow channel for 3D printing processing. During the unwinding process of the material disc 4, the material disc 4 has a tendency to rotate in the first direction or the second direction under the action of the relatively large rigidity and good elasticity of the continuous fiber filament, and the material disc 4 can be kept at a certain position without external force under the cooperation of the above-mentioned stopper and the cooperating part, and will not rotate in the unwinding or winding direction, avoiding a series of problems such as entanglement, scattering and even breakage of the material, and at the same time, only the friction between the blocking part 232 and the cooperating part needs to be overcome during feeding, the resistance received by the continuous fiber is small, which can make the continuous fiber filament more smooth when entering the flow channel of the 3D printer, and is conducive to the accuracy of fiber filament laying and the reduction of the occurrence of blockage.

[0048] Specifically in the embodiment, as shown in the drawings, the mounting frame includes a base 1 and a fixed seat 2 fixedly arranged on the base 1, the fixed seat 2 has a mounting hole 24; the rotating frame includes a rotating seat 3, the material disc 4 is fixed on the rotating seat 3 and rotates synchronously with the rotating seat 3, the rotating seat 3 has a rotating part 32, the rotating part 32 is rotatably arranged in the mounting hole 24, and the above-mentioned stopper and the cooperating part are arranged between the circumferential hole wall of the mounting hole 24 and the outer side of the rotating part 32, wherein the blocking part of the stopper elastically abuts against the cooperating part in the radial direction of the rotating part 32 or the mounting hole 24.

[0049] Referring to Figures 1 to 13As shown, the mating member is specifically a gear ring 34, which includes a plurality of teeth 341 arranged at intervals in the circumferential direction, and a tooth gap 342 is formed between two adjacent teeth 341, and the plurality of teeth 341 constitute the blocking structure; and the stop member is specifically an elastic arm 23, which further has an engaging portion 231, and the engaging portion 231 and the stop portion 232 are arranged at different ends in the length direction of the elastic arm 23, and the stop portion 232 is capable of being clamped in the tooth gap 342 in a matched manner. The elastic arm 23 can be made of plastic material and have a certain flexibility, so that the stop portion 232 can swing relative to the engaging portion 231.

[0050] The engaging portion 231 of the elastic arm 23 is fixedly engaged on one of the outer circumferential portion of the rotating portion 32 and the circumferential hole wall of the mounting hole 24, and the gear ring 34 is fixedly arranged on the other one of the outer circumferential portion of the rotating portion 32 and the circumferential hole wall of the mounting hole 24, and the circumferential hole wall of the mounting hole 24 and the outer circumferential portion of the rotating portion 32 form a swing space for the stop portion 232 to swing perpendicular to the rotation center line X. In this way, during the rotation of the rotating seat 3 relative to the fixed seat 2 in the first direction, the elastic arm 23 deforms, so that the stop portion 232 can elastically swing along the radial direction of the mounting hole 24 and can enter another tooth gap 342 from one tooth gap 342 under the action of its own elasticity, so that the rotating seat 3 can normally rotate with the tray 4; and when the rotating seat 3 is not driven to rotate in the first direction, the stop portion 232 is clamped in one of the tooth gaps 342, thereby preventing the rotating seat 3 from rotating relative to the fixed seat 2 in the second direction. When the rotating seat 3 is not driven to rotate in the first direction, the stop portion 232 is clamped in one of the tooth gaps 342, so that the tray 4 is limited in the current position.

[0051] In the embodiment, the gear ring 34 is fixedly arranged on the outer circumferential portion of the rotating portion 32, and the elastic arm 23 is arranged in the mounting hole 24 and the engaging portion 231 is fixedly engaged on the circumferential hole wall of the mounting hole 24. Specifically, the gear ring 34 is integrally formed on the rotating portion 32, and the elastic arm 23 is also integrally formed on the fixed seat 2, so that the components of the material feeding device are reduced, the number of forming molds is correspondingly reduced, and the installation is more convenient.

[0052] Specifically, referring to Figs. 1 and 2, Figure 5 , Figure 6 As shown, the elastic arm 23 further includes an arm body 233 between the engaging portion 231 and the stop portion 232, and the arm body 233 has a spacing with the circumferential hole wall of the mounting hole 24, and the space between the two forms a swing space for the stop portion 232 to swing. The arm body 233 specifically has an arc shape, which is centered on the rotation center line X, the engaging portion 231 extends radially outward from one end of the arm body 233, and the stop portion 232 extends radially inward from the other end of the arm body 233.

[0053] The elastic arms 23 are arranged in multiple groups, preferably uniformly spaced, and preferably three groups. The stop portions 232 of the multiple groups of elastic arms 23 are respectively matched with the multiple tooth grooves 342 to limit the rotation of the rotating seat 3, and are more stable and reliable.

[0054] Referring to Figures 5 to 13 As shown, the stop portion 232 has a stop surface 232a and a sliding surface 232b arranged on different sides in the thickness direction of the stop portion 232, and the tooth groove 34 has a first groove wall 343 and a second groove wall 344 arranged opposite to each other, where the first groove wall 343 is perpendicular to the rotation center line X, and the second groove wall 344 is inclined to the rotation center line X. When the stop portion 232 is inserted into the tooth groove 34, the stop surface 232a is matched with the first groove wall 343, and the sliding surface 232b is matched with the second groove wall 344. When the tray 4 is not driven by an external force, the stop surface 232a is limited by the first groove wall 343 to limit the rotation of the tray 4 in the second direction. When the tray 4 rotates in the first direction, the sliding surface 232b is matched with the second groove wall 344 to enable the stop portion 232a to enter another tooth groove 34 from one tooth groove 34. In a specific arrangement, the stop surface 232a is arranged as a plane that can be matched with the first groove wall 343, and the sliding surface 232b is arranged as an inclined surface that can be matched with the second groove wall 344. A small external traction force of the material can enable the stop portion 232 to slide along the second groove wall 344 and enter another tooth groove 34.

[0055] Referring to the drawings, the material discharging device further includes a rotating shaft 6 and a bearing 7. The rotating shaft 6 is rotatably arranged on the rotating seat 3 through the bearing 7. By rotating the rotating seat 3 around the rotating shaft 6, the tray 4 can be synchronously rotated around the rotating shaft 6.

[0056] In the material discharging device of the embodiment, the base 1 is fixedly provided with a positioning portion 11, and one axial end of the rotating shaft 6 is arranged to abut against the positioning portion 11 for limiting the axial position. The fixed seat 2 has a fixed portion 21 and a matching portion 22 that are connected in the axial direction. The outer diameter of the fixed portion 21 is larger than that of the matching portion 22. The fixed portion 21 is fixedly installed on the base 1, and the mounting hole 24 penetrates the fixed seat 2 in the axial direction.

[0057] The rotating seat 3 further has a connecting portion 31 and a limiting portion 33, the connecting portion 31, the limiting portion 33 and the rotating portion 32 are sequentially connected in the axial direction, the outer diameter of the limiting portion 33 is larger than the outer diameter of the connecting portion 31 and the outer diameter of the rotating portion 32, a gear ring 34 is integrally formed on the outer side of the rotating portion 32, the rotating portion 32 with the gear ring 34 is inserted into the mounting hole 24 and matched with the elastic arm 23, the limiting portion 33 limits the axial position between the fixed seat 2 and the rotating seat 3, the connecting portion 31 is coaxial with the material disc 4 and is detachably fixedly connected, here, the connecting portion 31 comprises a cylindrical connecting main body 311 and a plurality of ribs 312 arranged on the outer side of the connecting main body 311, all the ribs 312 extend in the axial direction of the connecting main body 311, and all the ribs 312 are uniformly and spacedly distributed in the circumferential direction, the connecting portion 31 and the central hole 42 of the material disc 4 are connected through interference fit of the ribs 312, so that the connecting portion 31 and the central hole 42 can be assembled and disassembled manually, and daily operation is more convenient.

[0058] The feeding device further comprises an end cover 5 arranged on the one side of the connecting portion 31 penetrating the central hole 42, for limiting the axial position of the rotating shaft 6 on this side, and avoiding the material disc 4 from being separated from the connecting portion 31 due to accident. The end cover 5 can be fixedly connected with the rotating shaft 6 through magnetic attraction.

[0059] In the feeding device provided by the embodiment, the fixed seat 2, the rotating seat 3 and the material disc 4 are integrally formed as a whole component of the same material, when used in a 3D printer, the fixed seat 2, the rotating seat 3 and the material disc 4 are all plastic parts, the processing and forming process is simple, the assembly is convenient, and the continuous fiber filament can be continuously and effectively unwound. Meanwhile, the structure can also be used to transform the existing feeding device of the material disc 4, to avoid problems such as winding, scattering and breaking of the material during the feeding process.

[0060] Without drawings, the utility model further provides a 3D printer with the feeding device, for unwinding the continuous fiber filament, which can effectively avoid a series of problems such as winding, scattering and even breaking of the continuous fiber filament, and make the continuous fiber filament more smoothly enter the flow channel of the 3D printer, which is beneficial to the accuracy of fiber filament laying and the reduction of the blocking phenomenon.

[0061] As shown in the specification and claims, the terms "comprise" and "include" only indicate the inclusion of the steps and elements explicitly identified, and these steps and elements do not constitute an exclusive list, and the method or device can also include other steps or elements.

[0062] It is further to be understood that the terms "first", "second", etc., are used to describe various information, but such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other, and do not indicate a particular order or importance. In fact, the expressions "first", "second", etc. can be used interchangeably. For example, the first information can also be referred to as the second information without departing from the scope of the present disclosure, and similarly, the second information can also be referred to as the first information.

[0063] The above examples are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A material dispensing device, comprising a mounting frame and a rotating frame, the rotating frame comprising at least an outer circumferential portion for a material tray for winding a material, the rotating frame being rotatably arranged on the mounting frame about a rotating center line, the rotating frame releasing the material on the material tray when rotating in a first direction, characterized in that: the material dispensing device further comprises a stopper and a cooperating member, one of the stopper and the cooperating member being arranged on the mounting frame and the other being arranged on the rotating frame, wherein: the stopper has a stop portion elastically abutting on the cooperating member to provide a resistance when the rotating frame rotates in the first direction relative to the mounting frame; and the cooperating member further has a blocking structure, the stop portion and the blocking structure cooperating with each other to prevent the rotating frame from rotating in a second direction opposite to the first direction. the mounting frame comprises a fixed seat fixedly mounted on a machine base, the fixed seat having a mounting hole; the rotating frame comprises a rotating seat, the material tray being fixedly mounted on the rotating seat, the rotating seat having a rotating portion rotatably arranged in the mounting hole about the rotating center line, the stopper and the cooperating member being arranged between a circumferential hole wall of the mounting hole and an outer circumferential portion of the rotating portion, the stop portion elastically abutting on the cooperating member in a radial direction of the rotating portion or the mounting hole. the cooperating member is a gear ring, the gear ring comprising a plurality of teeth arranged at intervals in a circumferential direction, a tooth slot being formed between two adjacent teeth, the plurality of teeth constituting the blocking structure; 2. A dispensing device according to claim 1, wherein: the stopper is an elastic arm, the elastic arm further having an engaging portion, the engaging portion and the stop portion being arranged at different ends of the elastic arm in a length direction of the elastic arm, the stop portion being capable of being fittedly clamped in the tooth slot; 3. A dispensing device according to claim 2, wherein: wherein the engaging portion is fixedly engaged on one of the outer circumferential portion of the rotating portion and the circumferential hole wall of the mounting hole, the gear ring being fixedly arranged on the other of the outer circumferential portion of the rotating portion and the circumferential hole wall of the mounting hole, a swing space for the stop portion to swing perpendicularly to the rotating center line being formed between the circumferential hole wall of the mounting hole and the outer circumferential portion of the rotating portion. the gear ring is fixedly arranged on the outer circumferential portion of the rotating portion, the elastic arm being arranged in the mounting hole and the engaging portion being fixedly engaged on the circumferential hole wall of the mounting hole, wherein the elastic arm further comprises an arm main body between the engaging portion and the stop portion, the arm main body having a spacing with the circumferential hole wall of the mounting hole.

4. A dispensing device according to claim 3, wherein: the arm main body is arc-shaped, the arc-shaped being centered on the rotating center line, the engaging portion extending radially outward from one end of the arm main body, the stop portion extending radially inward from the other end of the arm main body. the stop portion has a stop surface and a sliding surface separately arranged on different sides in a thickness direction of the stop portion, the tooth slot having a first slot wall and a second slot wall oppositely arranged, the first slot wall being perpendicular to the rotating center line, the second slot wall being oblique to the rotating center line, 5. A dispensing device according to claim 4, wherein: ​ 6. The dispensing apparatus of claim 3, wherein: ​ When the stopper is inserted into the tooth groove, the stop surface is matched with the first groove wall, the sliding surface is matched with the second groove wall, and the sliding surface matched with the second groove wall when the tray rotates in the first direction makes the stopper enter another tooth groove from one tooth groove.

7. The dispensing apparatus of claim 2, wherein: The rotating seat further comprises a limiting part and a connecting part, the connecting part, the limiting part and the rotating part are sequentially connected in the axial direction, the outer diameter of the limiting part is greater than the outer diameter of the connecting part and the outer diameter of the rotating part, the connecting part is coaxial with the tray and is detachably fixedly connected.

8. A dispensing device according to claim 7, wherein: The connecting part comprises a cylindrical connecting body and a plurality of protrusions arranged on the outer side of the connecting body, all the protrusions extend in the axial direction of the connecting body, and all the protrusions are uniformly and spacedly distributed in the circumferential direction, and the connecting part and the central hole of the tray are connected by interference fit through the protrusions.

9. The dispensing apparatus of claim 1, wherein: In the circumferential direction around the rotation center line, the stopper is provided with a plurality of groups of stoppers which are spacedly distributed, and each group of stoppers is matched with the corresponding blocking structure.

10. A 3D printer characterized by: The feeding device has the advantages that the feeding device is simple in structure, convenient to use, and can effectively prevent the tray from rotating in the second direction.

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