Automatic discharging mechanism and 3D printer

Abstract

The utility model belongs to 3D printing technical field discloses a kind of automatic discharging mechanism and 3D printer, the automatic discharging mechanism includes: conveying component, the conveying component includes conveyer belt and with the first roller and second roller of conveyer belt transmission connection;Driving assembly, the driving assembly is located in the inside of the first roller, the driving assembly is used to drive the first roller rotation, the driving assembly includes stator and with the rotor of stator transmission connection, the stator is embedded in the inside of the rotor.The utility model is by being located in the inside of first roller with driving assembly, realizes driving first roller rotation, need not external driving system, smaller volume, simultaneously, automatic discharging mechanism as a whole, can be directly replaced, applied in existing 3D printer, realizes efficient, convenient, stable and universal automatic discharging operation.

Description

Technical Field

[0001] This utility model belongs to the field of 3D printing technology, and relates to an automatic feeding mechanism and a 3D printer. Background Technology

[0002] With the increasing popularity and widespread application of 3D printing technology, printing efficiency and print quality have become key factors for continuous breakthroughs and improvements in this field. Traditional 3D printers often face numerous inconveniences and limitations in the material unloading process after printing.

[0003] Existing 3D printers rely on complex external drive and transmission devices to transfer the model during material feeding. These external devices typically include independent motors, reduction gear systems, and various connecting components. This not only occupies a significant amount of space, making the overall structure of the printer bulky and hindering the miniaturization and integration of the equipment, but also increases the difficulty of assembly and debugging due to the numerous external connections and coordination involved.

[0004] Therefore, there is an urgent need in this field for an automatic feeding mechanism and a 3D printer to solve the above-mentioned technical problems. Utility Model Content

[0005] In view of this, the purpose of this utility model is to solve the above problems and provide an automatic feeding mechanism for a 3D printer, comprising:

[0006] A conveying assembly, the conveying assembly including a conveyor belt and a first roller and a second roller connected to the conveyor belt in a driving manner;

[0007] A drive assembly is disposed inside the first roller shaft and is used to drive the first roller shaft to rotate. The drive assembly includes a stator and a rotor that is drivenly connected to the stator. The stator is embedded inside the rotor, and the rotor is connected to the first roller shaft.

[0008] As a further improvement of this utility model, the drive assembly further includes a fixed shaft, which is disposed on the axis of the first roller shaft, and the rotor is sleeved on the fixed shaft.

[0009] As a further improvement of this utility model, a speed reducer is also sleeved on the fixed shaft.

[0010] As a further improvement of this utility model, the automatic feeding mechanism also includes a bracket, which includes a first support arm and a second support arm arranged in parallel.

[0011] The first support arm is connected to the first roller and the second roller respectively, and the second support arm is connected to the first roller and the second roller respectively. The first support arm and the second support arm are respectively disposed on both sides of the conveyor belt.

[0012] As a further improvement of this utility model, the first support arm is provided with a first shaft hole, the second support arm is provided with a second shaft hole, and the two ends of the fixed shaft are respectively placed in the first shaft hole and the second shaft hole.

[0013] As a further improvement of this utility model, the first support arm is provided with a first tensioning hole, and a first tensioning member is slidably disposed in the first tensioning hole; the second support arm is provided with a second tensioning hole, and a second tensioning member is slidably disposed in the second tensioning hole.

[0014] The two ends of the second roller are fixedly connected to the first tensioning member and the second tensioning member, respectively.

[0015] As a further improvement of this utility model, the automatic feeding mechanism further includes a support platform, which includes a first support plate and a second support plate arranged in parallel and spaced apart. The first support plate and the second support plate are located within the space enclosed by the conveyor belt and are configured to support the conveyor belt.

[0016] As a further improvement of this utility model, at least three strain gauges are arranged on the first support plate, and the strain gauges are provided with sensing columns. The first support plate is connected to the second support plate through the sensing columns; or a heating plate is provided between the first support plate and the second support plate, and a heating wire is provided on the edge of the heating plate. The heating wire passes through the first support arm and is connected to an external heating device.

[0017] As a further improvement of this utility model, the conveyor belt is a seamless welded steel belt, and the surface of the conveyor belt is printed with a polyetherimide coating.

[0018] This utility model also provides a 3D printer, which includes the above-mentioned automatic feeding mechanism for the nozzle module. The nozzle module is configured to extrude and deposit filament onto the automatic feeding mechanism to form a printed model. The automatic feeding mechanism is configured to transport and unload the printed model.

[0019] The technical advantages of this invention are as follows: Compared with existing technologies, the automatic feeding mechanism provided by this invention, by setting a drive component inside the first roller shaft, drives the first roller shaft to rotate. The first and second roller shafts serve as support and transmission components for the conveyor belt. When the first roller shaft starts to rotate under the action of the drive component, it drives the conveyor belt to move through the friction between the first roller shaft and the conveyor belt. Compared with traditional 3D printer feeding mechanisms, there is no need to set up a large motor and transmission system outside the printer, reducing the transmission errors and power losses that may be caused by intermediate transmission links such as belts and chains, making the structure of the entire automatic feeding mechanism more compact and simple. This is beneficial for the miniaturization design of 3D printers, improves the overall layout rationality of the equipment, and reduces the maintenance frequency and cost of the equipment. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model, not all embodiments. For those skilled in the art, other drawings obtained from these drawings without creative effort are all within the protection scope of this utility model.

[0021] Figure 1 This is a perspective view of an automatic feeding mechanism provided in an embodiment of the present utility model;

[0022] Figure 2 This is a side view of an automatic feeding mechanism provided in an embodiment of the present utility model;

[0023] Figure 3 yes Figure 2 Cross-sectional view at point AA;

[0024] Figure 4 This is an exploded view of an automatic feeding mechanism provided in an embodiment of this utility model.

[0025] Among them, 10 is the conveying component, 11 is the conveyor belt, 12 is the first roller, and 13 is the second roller;

[0026] 20 is the drive assembly, 21 is the stator, 22 is the rotor, 23 is the fixed shaft, 24 is the reducer, and 25 is the wire;

[0027] 30 is a bracket, 31 is a first support arm, 311 is a first shaft hole, 312 is a first tension hole, 313 is a first tensioning member, 32 is a second support arm, 321 is a second shaft hole, 322 is a second tension hole, and 323 is a second tensioning member;

[0028] 40 is the support platform, 41 is the first support plate, 411 is the strain gauge, 412 is the sensing column, 42 is the second support plate, 43 is the heating plate, and 431 is the heating wire. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0030] To make the description of this disclosure more detailed and complete, illustrative descriptions of the embodiments and specific examples of this utility model are provided below; however, this is not the only form of implementing or using the specific embodiments of this utility model. The embodiments cover the features of multiple specific embodiments and the methods, steps, and sequences for constructing and operating these specific embodiments. However, other specific embodiments can also be used to achieve the same or equivalent functions and sequence of steps. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0031] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0032] It should be understood that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this utility model described herein can be implemented in sequences other than those illustrated or described herein.

[0033] In the description of this utility model, the terms "front", "rear", "top", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] Please refer to Figures 1-4 One embodiment of this utility model provides an automatic feeding mechanism and a 3D printer to solve the problem that existing 3D printers need to rely on complex external driving and transmission devices to achieve model transfer operations during feeding.

[0035] Specifically, please refer to Figure 1 This is a perspective view of an automatic feeding mechanism provided in an embodiment of the present invention. The automatic feeding mechanism includes a conveying component 10 and a driving component 20. Specifically, the conveying component 10 includes a conveyor belt 11 and a first roller 12 and a second roller 13 that are drively connected to the conveyor belt 11. Please refer to [link / reference needed]. Figures 2-3 The drive assembly 20 is located inside the first roller shaft 12. The drive assembly 20 drives the first roller shaft 12 to rotate. The drive assembly 20 includes a stator 21 and a rotor 22 that is driveably connected to the stator 21. The stator 21 is embedded inside the rotor 22, and the rotor 22 is connected to the first roller shaft 12. By positioning the drive assembly 20 inside the first roller shaft 12, the stator 21 in the drive assembly 20 generates a rotating magnetic field after being energized. Since the stator 21 is embedded inside the rotor 22, the rotor 22 is within the rotating magnetic field of the stator 21. According to the principle of electromagnetic induction, the rotor 22 will be subjected to electromagnetic force and rotate. The rotor 22 is directly or indirectly connected to the first roller shaft 12, thereby driving the first roller shaft 12 to rotate. The first roller shaft 12 and the second roller shaft 13 serve as support and transmission components for the conveyor belt 11. When the first roller shaft 12 starts to rotate under the action of the drive assembly 20, it drives the conveyor belt 11 to move through the frictional force between itself and the conveyor belt 11. The conveyor belt 11 circulates between the first roller 12 and the second roller 13, forming a continuous conveying plane. In the 3D printer, the printed model is placed on the conveyor belt 11 and transported to the designated position as the conveyor belt 11 moves, realizing the function of automatic feeding. Integrating the drive component 20 inside the first roller 12 greatly reduces the space occupied by the external drive device. Compared with the traditional feeding mechanism of 3D printers, there is no need to set up a large motor and transmission system outside the printer, reducing the transmission errors and power losses that may be caused by intermediate transmission links such as belts and chains, making the structure of the entire automatic feeding mechanism more compact and simple. It is conducive to the miniaturization design of 3D printers, improves the overall layout rationality of the equipment, and reduces the maintenance frequency and cost of the equipment. For example, there is no need to regularly check and adjust the belt tension or replace worn chains; only the drive component 20 integrated inside the roller needs to be maintained.

[0036] As a further improvement of this utility model, the upper drive assembly 20 also includes a fixed shaft 23, which is disposed on the axis of the first roller shaft 12, and the rotor 22 is sleeved on the fixed shaft 23. By setting the fixed shaft 23 on the axis of the first roller shaft 12, a stable central positioning reference is provided for the entire drive assembly 20, enabling the various parts of the drive assembly 20 to maintain an accurate and stable relative positional relationship around it. At the same time, a wiring groove is provided inside the fixed shaft 23, which contains the energized wires 25 of the stator 21. When the automatic feeding mechanism is running, the current is transmitted to the stator 21 through the wires 25, causing the stator 21 to generate a rotating magnetic field that drives the rotor 22 to rotate. This makes full use of the space inside the fixed shaft 23 that might otherwise be idle, avoiding the increase in the overall size of the mechanism caused by planning external wiring space separately for the wires 25. This makes the structure of the automatic feeding mechanism more compact, achieving the integration of more functional components within a limited space.

[0037] As a further improvement of this utility model, a reducer 24 is also fitted onto the fixed shaft 23. By fitting the reducer 24 onto the fixed shaft 23, the running speed of the conveyor belt 11 can be precisely controlled. Different 3D printing processes and the characteristics of the printed models may have different requirements for the feeding speed. The reducer 24 can be used to flexibly adjust the rotation speed according to the actual situation, ensuring that the conveyor belt 11 delivers the printed model at a suitable speed. The adjustment of rotation speed and torque by the reducer 24 indirectly protects the entire drive assembly 20 and related transmission components. Excessive rotation speed and unsuitable torque may cause excessive wear or excessive impact loads on components such as the rotor 22, the first roller shaft 12, and the conveyor belt 11. After the reducer 24 adjusts the input power to a reasonable range, it allows each component to operate under relatively mild and stable working conditions, reducing fatigue damage and the probability of failure, thereby extending the service life of the entire automatic feeding mechanism.

[0038] As a further improvement to this utility model, please refer to Figure 4The aforementioned automatic feeding mechanism also includes a support 30, which includes a first support arm 31 and a second support arm 32 arranged in parallel. The first support arm 31 is connected to the first roller 12 and the second roller 13 respectively, and the second support arm 32 is connected to the first roller 12 and the second roller 13 respectively. The first support arm 31 and the second support arm 32 are respectively located on both sides of the conveyor belt 11. The support frame 30 consists of a first support arm 31 and a second support arm 32 arranged in parallel. The first support arm 31 is connected to the first roller 12 and the second roller 13 respectively, and the second support arm 32 is also connected to the first roller 12 and the second roller 13 respectively. The first support arm 31 and the second support arm 32 are located on both sides of the conveyor belt 11. The first support arm 31, the second support arm 32, the first roller 12 and the second roller 13 form a stable frame structure. The first support arm 31 and the second support arm 32 provide reliable support points for the first roller 12 and the second roller 13, so that the drive assembly 20 can play a better role and ensure that when the rotor 22 drives the first roller 12 to rotate, the rotation axis of the first roller 12 always remains horizontal and fixed in position, thereby accurately transmitting power to the conveyor belt 11. On the other hand, for the second roller 13, the connection of the bracket 30 keeps it parallel to the first roller 12 and in an accurate relative position, ensuring that the conveyor belt 11 can form a suitable tension and good transmission contact between the two rollers, so that the conveyor belt 11 can run smoothly and realize the continuous transport of the 3D printed model.

[0039] As a further improvement of this utility model, the first support arm 31 is provided with a first shaft hole 311, the second support arm 32 is provided with a second shaft hole 321, and the two ends of the fixed shaft 23 are respectively placed in the first shaft hole 311 and the second shaft hole 321. Placing the two ends of the fixed shaft 23 in the shaft holes significantly enhances the overall structural stability of the automatic feeding mechanism. Compared with a structure without this precise fixing method, it effectively prevents unstable phenomena such as shaking and displacement of the fixed shaft 23 during operation. Since the position of the fixed shaft 23 is precisely fixed through the shaft hole, its rotation axis always remains fixed and strictly parallel to the running direction of the conveyor belt 11, ensuring the accuracy of power transmission. In the drive assembly 20, the torque generated by the rotor 22 is transmitted to the first roller shaft 12 through the fixed shaft 23, which then drives the conveyor belt 11 to move. The stability of the position of the fixed shaft 23 ensures that the torque can be transmitted accurately along the expected direction and path, avoiding deviations and losses in the power transmission process.

[0040] As a further improvement of this utility model, the first support arm 31 is provided with a first tensioning hole 312, and a first tensioning member 313 is slidably disposed within the first tensioning hole 312. The second support arm 32 is provided with a second tensioning hole 322, and a second tensioning member 323 is slidably disposed within the second tensioning hole 322. The two ends of the second roller shaft 13 are fixedly connected to the first tensioning member 313 and the second tensioning member 323, respectively. The first tensioning hole 312 is formed on the first support arm 31, and the second tensioning hole 322 is formed on the second support arm 32, providing space for the installation and sliding of the corresponding tensioning members. The first tensioning member 313 can slide in a specific direction within the first tensioning hole 312, and similarly, the second tensioning member 323 can slide within the second tensioning hole 322, and both are fixedly connected to the two ends of the second roller shaft 13, respectively. This design allows the position of the second roller shaft 13 to be flexibly adjusted by the sliding of the tensioning members within the tensioning holes. For example, when it is necessary to adjust the tension of the conveyor belt 11, the distance between the second roller shaft 13 and the first roller shaft 12 can be changed by moving the position of the tensioning member within the tensioning hole, thereby changing the magnitude of the tension force on the conveyor belt 11. The inner wall of the tensioning hole maintains a certain fitting precision with the tensioning member, ensuring smooth sliding of the tensioning member while preventing excessive shaking or deviation from the predetermined sliding track, thus providing a reliable structural basis for the precise adjustment of the position of the second roller shaft 13. Fixing the second roller shaft 13 by using the sliding arrangement of the tensioning member within the tensioning hole provides great flexibility for adjusting the tension of the conveyor belt 11. Compared with the traditional fixed roller structure, the tension of the conveyor belt 11 can be easily adjusted at any time according to the actual usage of the conveyor belt 11, such as the natural relaxation that occurs with the increase of usage time, and the changes in the tension requirements of the conveyor belt 11 due to the weight difference of different models of 3D printed models. This ensures that the conveyor belt 11 is always kept in a suitable tension, maintains good transmission efficiency and stability, and effectively avoids problems such as slippage, poor power transmission or excessive wear caused by improper tension of the conveyor belt 11. This extends the service life of the conveyor belt 11 and improves the reliability of the automatic feeding mechanism.

[0041] As a further improvement of this utility model, the automatic unloading mechanism also includes a support platform 40. The support platform 40 includes a first support plate 41 and a second support plate 42 arranged parallel and spaced apart. The first support plate 41 and the second support plate 42 are located within the space enclosed by the conveyor belt 11 and are configured to support the conveyor belt 11. The support platform 40 is composed of the first support plate 41 and the second support plate 42 arranged parallel to the conveyor belt 11. These two support plates form a relatively stable planar structure in space, which can play an auxiliary support role under the conveyor belt 11. When the conveyor belt 11 carries the 3D printed model for transportation, although the main support and power transmission rely on the first roller shaft 12 and the second roller shaft 13, the support platform 40 can share the weight borne by the conveyor belt 11 to a certain extent, avoiding problems such as excessive deformation of the conveyor belt 11 due to carrying excessively heavy models for a long time. Compared with no such bottom support structure, it can better resist the interference of the weight of the equipment itself, the weight of the model, and various external forces generated during operation, preventing the entire mechanism from shaking, displaced, or other unstable phenomena. Whether the equipment is stationary or in the dynamic process of conveyor belt 11 transporting the model, the support platform 40 can maintain the stability of the mechanism by relying on the support of the first support plate 41 and the second support plate 42, reducing the risk of wear and damage caused by instability between components, extending the service life of the equipment, and providing a strong guarantee for the 3D printer to continuously and reliably complete the feeding operation.

[0042] As an example, the first support plate 41 and the second support plate 42 can be fixed by being fixedly connected to the first support arm 31 or the second support arm 32.

[0043] As a further improvement of this utility model, at least three strain gauges 411 are arranged on the first support plate 41, and each strain gauge 411 is provided with a sensing post 412. The first support plate 41 is connected to the second support plate 42 through the sensing post 412. The arrangement of at least three strain gauges 411 on the first support plate 41 allows for the acquisition of stress information of the support platform 40 from multiple points. When the support platform 40 is subjected to pressure, the first support plate 41 undergoes a slight deformation, which is transmitted to the strain gauges 411. The strain gauges 411 convert the pressure signal into an electrical signal, which is then detected. The sensing post 412 on each strain gauge 411 not only connects the first support plate 41 and the second support plate 42, but also effectively transmits the pressure borne by the second support plate 42 to the strain gauge 411, ensuring that the strain gauge 411 can accurately sense the pressure distribution of the entire support platform 40. Since the three strain gauges 411 are distributed at different positions on the first support plate 41, the magnitude of the pressure sensed by the three strain gauges 411 when the support platform 40 is subjected to pressure will vary depending on the tilt of the second support plate 42. If the support platform 40 is a planar structure, when the second support plate 42 is horizontal, the magnitude of the pressure sensed by the three strain gauges 411 should be equal under uniform load. However, if the second support plate 42 is tilted, the strain gauge 411 on the lower side will generate a larger electrical signal change due to the greater pressure, while the strain gauge 411 on the higher side will sense a smaller pressure. By comparing the magnitudes of the pressure sensed by the three strain gauges 411, it is possible to determine whether the second support plate 42 is horizontal. Since the conveyor belt 11 is parallel to the first support plate 41 and the second support plate 42 of the support platform 40, the horizontal state of the second support plate 42 directly reflects the horizontal state of the conveyor belt 11. Using three strain gauges 411 to determine the horizontal state of the second support plate 42 and the conveyor belt 11 provides higher accuracy in horizontal monitoring compared to traditional simple visual observation or single-point detection methods. This multi-point measurement method can more sensitively capture minute tilting situations and promptly detect any unevenness that may occur on the conveyor belt 11.

[0044] As a further improvement of this utility model, a heating plate 43 is provided between the first support plate 41 and the second support plate 42. A heating wire 431 is provided along the edge of the heating plate 43, passing through the first support arm 31 and connecting to an external heating device. By setting the heating plate 43 and supplying power to the external heating device via the heating wire 431, a stable temperature environment can be created for the automatic feeding mechanism. Compared with traditional structures without heating functions, in some temperature-sensitive 3D printing applications, such as printing models of thermoplastic materials, the models tend to harden and become brittle at low temperatures. The heating plate 43 can maintain a suitable temperature for the conveyor belt 11 and its surrounding area, allowing the model to maintain good flexibility and mobility during transport, preventing damage, jamming, etc., and improving the quality and efficiency of feeding. The suitable temperature environment created by the heating plate 43 also has a positive impact on the performance of other components of the entire automatic feeding mechanism. In low-temperature environments, the friction between components may increase and the mechanical properties of materials, such as toughness, may deteriorate. The heat from the heating plate 43 can alleviate these problems, enabling components such as the conveyor belt 11, rollers, and drive assembly 20 to operate under relatively ideal temperature conditions. This reduces abnormalities such as wear and jamming of components, extends the service life of the equipment, and improves the working stability and reliability of the equipment under different ambient temperatures, ensuring that the feeding operation can be carried out continuously and smoothly.

[0045] As a further improvement of this utility model, the conveyor belt 11 is a seamlessly welded steel belt, and the surface of the conveyor belt 11 is printed with a polyetherimide coating. The seamlessly welded steel belt conveyor belt 11 is in close cooperation with the first roller shaft 12 and the second roller shaft 13 in the drive assembly 20. Its flat and continuous surface can maintain good contact with the roller shafts, ensuring that when the roller shafts rotate, the friction force can stably drive the conveyor belt 11 to circulate, realizing the effective transmission of power and transporting the 3D printed model from one position to another. The excellent properties of the polyetherimide coating enable it to adapt to 3D printed models made of various materials. Regardless of whether the model is made of thermoplastic materials, resin materials, or other special materials, the coating can prevent the model from sticking to the conveyor belt 11, causing chemical reactions or other adverse conditions, ensuring that all types of models can be smoothly transported on the conveyor belt 11, expanding the applicability of the automatic feeding mechanism, and enabling it to better meet the diverse feeding needs of 3D printing.

[0046] This utility model also provides a 3D printer, which includes a nozzle module and the aforementioned automatic feeding mechanism. The nozzle module is configured to extrude and deposit filament onto the automatic feeding mechanism to form a printed model. The automatic feeding mechanism is configured to transport and unload the printed model. By integrating the automatic feeding mechanism, automatic transport and unloading of the printed model are achieved, reducing manual intervention and improving production efficiency, especially suitable for batch or continuous printing scenarios. By setting up an automatic feeding mechanism, the traditional 3D printer feeding mechanism avoids the need for an additional large motor and transmission system outside the printer, reducing transmission errors and power losses that may be caused by intermediate transmission links such as belts and chains, making the entire automatic feeding mechanism more compact and concise. The automatic feeding mechanism can smoothly transport the printed model, avoiding damage or deformation of the model that may be caused by manual handling, especially for fragile or delicate structures. At the same time, the collaborative work of the nozzle module and the automatic feeding mechanism supports a "print-unloading-reprinting" cycle, shortening equipment downtime and optimizing the overall workflow.

[0047] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The above embodiments only illustrate preferred implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An automatic feeding mechanism for a 3D printer, characterized in that, include: A conveying assembly, the conveying assembly including a conveyor belt and a first roller and a second roller connected to the conveyor belt in a driving manner; A drive assembly is disposed inside the first roller shaft and is used to drive the first roller shaft to rotate. The drive assembly includes a stator and a rotor that is drivenly connected to the stator. The stator is embedded inside the rotor, and the rotor is connected to the first roller shaft.

2. The automatic feeding mechanism according to claim 1, characterized in that: The drive assembly further includes a fixed shaft, which is located on the axis of the first roller shaft, and the rotor is sleeved on the fixed shaft.

3. The automatic feeding mechanism according to claim 2, characterized in that: A speed reducer is also fitted onto the fixed shaft.

4. The automatic feeding mechanism according to claim 2, characterized in that: The automatic feeding mechanism also includes a support frame, which includes a first support arm and a second support arm arranged in parallel. The first support arm is connected to the first roller and the second roller respectively, and the second support arm is connected to the first roller and the second roller respectively. The first support arm and the second support arm are respectively disposed on both sides of the conveyor belt.

5. The automatic feeding mechanism according to claim 4, characterized in that: The first support arm is provided with a first shaft hole, the second support arm is provided with a second shaft hole, and the two ends of the fixed shaft are respectively placed in the first shaft hole and the second shaft hole.

6. The automatic feeding mechanism according to claim 4, characterized in that: The first support arm is provided with a first tensioning hole, and a first tensioning member is slidably disposed in the first tensioning hole; the second support arm is provided with a second tensioning hole, and a second tensioning member is slidably disposed in the second tensioning hole. The two ends of the second roller are fixedly connected to the first tensioning member and the second tensioning member, respectively.

7. The automatic feeding mechanism according to claim 4, characterized in that: The automatic feeding mechanism also includes a support platform, which includes a first support plate and a second support plate arranged in parallel and spaced apart. The first support plate and the second support plate are located within the space enclosed by the conveyor belt and are configured to support the conveyor belt.

8. The automatic feeding mechanism according to claim 7, characterized in that: At least three strain gauges are arranged on the first support plate, and each strain gauge has a sensing column. The first support plate is connected to the second support plate through the sensing column; or, a heating plate is provided between the first support plate and the second support plate, and a heating wire is provided on the edge of the heating plate. The heating wire passes through the first support arm and is connected to an external heating device.

9. The automatic feeding mechanism according to claim 1, characterized in that: The conveyor belt is a seamless welded steel belt, and the surface of the conveyor belt is printed with a polyetherimide coating.

10. A 3D printer, characterized in that: The 3D printer includes a nozzle module and an automatic feeding mechanism as described in any one of claims 1-9, wherein the nozzle module is configured to extrude and deposit filament onto the automatic feeding mechanism to form a printed model, and the automatic feeding mechanism is configured to transport and unload the printed model.

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