Feeding mechanism, printing head assembly and three-dimensional printing equipment

Abstract

The utility model relates to the technical field of lamination manufacturing, in particular to a feeding mechanism, a printing head assembly and three-dimensional printing equipment. The feeding mechanism comprises a feeding main body and a damping piece; the feeding body is provided with a feeding cavity, a feeding port and a discharging port, the feeding port and the discharging port are communicated with the feeding cavity, and consumables sequentially penetrate through the feeding port, the feeding cavity and the discharging port. The damping piece comprises a base part and a damping structure, the base part is arranged on the feeding body, and the damping structure is located between the feeding port and the discharging port and used for clamping consumables. The consumables are clamped through the damping piece, damping of the consumables relative to the feeding mechanism can be increased, and the problem of automatic feeding or discharging of the consumables is solved.

Description

Technical Field

[0001] This application relates to the field of additive manufacturing technology, and in particular to a feeding mechanism, a printhead assembly, and a 3D printing device. Background Technology

[0002] In a filament-based spray 3D printer, filament is continuously fed to the print head assembly, which melts the filament. A power mechanism moves the print head assembly relative to the printing platform, spraying filament according to the outline of the model. This process is repeated layer by layer to achieve a three-dimensional shape. The color of the model is determined by the filament; to achieve automatic multi-color printing, the filament needs to be replaced during the printing process.

[0003] In some related technologies, the printhead assembly has multiple filament channels, each corresponding to the transmission of filament of a specific color. The printhead assembly includes a drive wheel, which contacts the filament in one of the filament channels. The drive wheel's rotation drives the filament feeding and retraction. During filament switching, the drive wheel moves to contact another filament, and this process can easily lead to accidental contact with other filaments, causing problems with automatic filament feeding or retraction. Utility Model Content

[0004] The embodiments of this application aim to provide a feeding mechanism, a printhead assembly, and a 3D printing device, so as to at least improve the problem of automatic feeding or ejection of consumables.

[0005] In order to solve the above-mentioned technical problems, the embodiments of this application adopt the following technical solutions:

[0006] In a first aspect, embodiments of this application provide a feeding mechanism, which includes a feeding body and a damping element; the feeding body is provided with a feeding cavity, a feeding port, and a discharging port, the feeding port and the discharging port being connected to the feeding cavity, and the feeding port, the feeding cavity, and the discharging port being used for consumables to pass through sequentially; the damping element includes a base and a damping structure, the base being disposed on the feeding body, the damping structure being located between the feeding port and the discharging port, and the damping structure being used to clamp the consumables.

[0007] In some embodiments, the damping structure includes at least two elastic arms, the first ends of the at least two elastic arms being connected to the base, and the second ends of the at least two elastic arms being used to clamp the consumable.

[0008] In some embodiments, the base is provided with a through hole for the consumable to pass through; the second ends of the at least two elastic arms are provided with a first surface, and when the damping structure clamps the consumable, the first surface of the at least two elastic arms defines at least a portion of a first circle, the central axis of the first circle coinciding with the central axis of the through hole.

[0009] In some embodiments, the first surface is concave, and when the damping structure clamps the consumable, the projection of the first surface coincides with the first circle along the axial direction of the first circle.

[0010] In some embodiments, the base includes a first chamfer that connects the side of the base away from the resilient arm to the inner wall of the through hole.

[0011] In some embodiments, the second end of the elastic arm is provided with a second chamfer, the second chamfer connecting the first surface and the end face of the second end of the elastic arm.

[0012] In some embodiments, the feeding body is provided with a discharge port, which communicates with the feeding chamber; the feeding mechanism further includes a discharge member, which is disposed on the feeding body and is at least partially located between the feeding port and the discharge port; the discharge member is used to deform to avoid the consumable when the front end of the consumable moves from the feeding port toward the discharge port, and / or the discharge member is used to guide the consumable to the discharge port when the rear end of the consumable moves from the discharge port toward the feeding port.

[0013] In some embodiments, the damping structure includes a first elastic arm and a second elastic arm, a first end of the first elastic arm and a first end of the second elastic arm are connected to the base, and a second end of the first elastic arm and a second elastic arm are used to clamp the consumable; along a direction perpendicular to the feeding direction of the consumable, the first elastic arm, the second elastic arm and the first end of the ejector are arranged sequentially, the second end of the elastic arm extends toward the discharge port, and the second end of the ejector extends between the damping structure and the discharge port; the distance between the second end of the second elastic arm and the base is less than the distance between the second end of the first elastic arm and the base.

[0014] In some embodiments, the feeding mechanism further includes a driven wheel and a sensor. The driven wheel is rotatably disposed on the feeding body, and the rotation axis of the driven wheel is perpendicular to the feeding direction of the consumable. The driven wheel is used to contact the consumable and rotate under the drive of the consumable. The sensor is used to detect the rotational speed of the driven wheel.

[0015] Secondly, embodiments of this application provide a printhead assembly, the printhead assembly including the feeding mechanism as described in any of the preceding claims.

[0016] Thirdly, embodiments of this application provide a three-dimensional printing device, the three-dimensional printing device including the print head assembly.

[0017] The feeding mechanism, printhead assembly, and 3D printing equipment of this application embodiment can increase the damping of the consumables relative to the feeding mechanism by clamping the consumables with damping components, thereby improving the problem of automatic feeding or retraction of consumables.

[0018] The above description is merely an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0019] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0020] Figure 1 This is a schematic diagram of the feeding mechanism according to an embodiment of this application;

[0021] Figure 2 yes Figure 1 Sectional view at point A-A';

[0022] Figure 3 This is a schematic diagram of the structure of the damping component according to an embodiment of this application;

[0023] Figure 4 This is a schematic diagram of the damping component from another perspective according to an embodiment of this application;

[0024] Figure 5 This is a partial enlarged view of the damping component holding consumables in the state according to an embodiment of this application.

[0025] The reference numerals in the detailed embodiments are as follows:

[0026] 100. Feeding mechanism;

[0027] 1. Feeding body; 11. Feeding chamber; 12. Feeding inlet; 13. Discharge pipe; 131. Discharge outlet; 132. Clearance opening; 14. Unloading port;

[0028] 2. Damping component; 21. Base; 211. Through hole; 212. First chamfer;

[0029] 22. Damping structure; 221. Elastic arm; 2211. First surface; 2212. Second chamfer; 221a. First elastic arm; 221b. Second elastic arm;

[0030] 3. Guide tube; 4. Connecting cylinder; 5. Unloading component; 6. Driven wheel;

[0031] X, first direction; C, first circle; 200, consumables. Detailed Implementation

[0032] To facilitate understanding of this application, the following description, in conjunction with the accompanying drawings and specific embodiments, will provide a more detailed account. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected to" another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0034] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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 the embodiments of this application and simplifying the description, and are not intended to 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 the embodiments of this application.

[0035] In the description of the embodiments of this application, the terms "first," "second," etc., are used to define components merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0036] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0037] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0038] Please see Figure 1 and Figure 2 This application provides a feeding mechanism 100, which includes a feeding body 1 and a damping member 2. The feeding body 1 supports and guides the consumable 200. The damping member 2 is disposed on the feeding body 1 and increases the damping of the consumable 200 relative to the feeding mechanism 100. This prevents the consumable 200 from moving relative to the feeding mechanism 100 when subjected to unexpected forces, thus improving the problem of automatic feeding or unfeeding of the consumable 200. Feeding refers to the consumable 200 moving relative to the feeding mechanism 100 in a direction toward the device to be fed (not shown) to supply material to the device; unfeeding refers to the consumable 200 moving relative to the feeding mechanism 100 in a direction opposite to the feeding direction.

[0039] For the aforementioned feed body 1, please refer to Figure 1 and Figure 2 The feeding body 1 can be roughly box-shaped. The feeding body 1 has a feeding chamber 11, a feeding port 12, and a discharging port 131. The feeding port 12 and the discharging port 131 are connected to the feeding chamber 11, and the consumable 200 passes through them sequentially. The feeding port 12 and the discharging port 131 can guide and limit the consumable 200 to ensure that the consumable 200 is fed to the correct position. Optionally, the feeding body 1 is made of metal or plastic, such as cast iron or bakelite. Optionally, the consumable 200 is cylindrical, and the feeding port 12 and the discharging port 131 are also circular.

[0040] In some embodiments, there are multiple feed inlets 12 and multiple discharge outlets 131. The feed body 1 allows multiple consumables 200 to pass through in order to support and guide the multiple consumables 200.

[0041] The inlet 12 and outlet 131 through which the same consumable 200 passes constitute a set of inlet 12 and outlet 131. The direction from the inlet 12 to the outlet 131 is the feeding direction of this set of inlet 12 and outlet 131. In the embodiments of this application, please refer to Figure 2 The feed inlet 12 and the discharge outlet 131 are in the same group, and the feed inlet 12 and the discharge outlet 131 are spaced apart along the first direction X, that is, the feeding direction of the feed inlet 12 and the discharge outlet 131 is parallel to the first direction X. Therefore, when multiple consumables 200 are installed on the feeding mechanism 100, the multiple consumables 200 are parallel to each other, so that the multiple consumables 200 can be arranged more compactly and the space occupied by the multiple consumables 200 can be reduced.

[0042] In some examples, please refer to Figures 1 to 3 There are four inlet ports 12 and four outlet ports 131. The inlet ports 12 and the outlet ports 131 are paired one-to-one. The feeding direction of each set of inlet ports 12 and outlet ports 131 is parallel to the first direction X. Therefore, the feeding mechanism 100 can install a maximum of four consumables 200 at the same time.

[0043] In some other embodiments, the inlet 12 and the outlet 131 are not one-to-one. For example, one inlet 12 corresponds to two or more outlets 131, or one outlet 131 corresponds to two or more inlets 12.

[0044] In some embodiments, please refer to Figure 1 and Figure 2 The feeding body 1 includes a discharge pipe 13, which includes a discharge port 131. The discharge pipe 13 typically has a certain length to enhance the guiding and limiting effect on the consumable 200.

[0045] In some embodiments, please refer to Figure 1 and Figure 2 The feeding mechanism 100 also includes a guide tube 3, which is installed on the feeding body 1 and communicates with the feeding port 12. The guide tube 3 is used for the consumable 200 to pass through, so as to guide the consumable 200 to a direction parallel to the opening of the feeding port 12 before it enters the feeding port 12, thereby improving the problem that the consumable 200 is bent and cannot be fed normally within the feeding mechanism 100. Optionally, the guide tube 3 is made of Teflon.

[0046] In some embodiments, please refer to Figure 1 and Figure 2 The feeding mechanism 100 also includes a connecting cylinder 4, which passes through the feed inlet 12. The connecting cylinder 4 is used for the guide tube 3 to pass through, so as to install the guide tube 3 on the feeding body 1 and communicate with the feed inlet 12. The connecting cylinder 4 and the guide tube 3 are detachably connected.

[0047] For the aforementioned damping element 2, please refer to Figures 2 to 4 The damping component 2 includes a base 21 and a damping structure 22. The base 21 is located on the feeding body 1, and the damping structure 22 is located between the feed inlet 12 and the discharge outlet 131. The damping structure 22 is used to clamp the consumable 200. By positioning the damping structure 22 between the feed inlet 12 and the discharge outlet 131, when the consumable 200 passes through the feed inlet 12 and the discharge outlet 131 in sequence, the consumable 200 also passes through the damping structure 22, thereby increasing the damping of the consumable 200 relative to the feeding mechanism 100 during feeding and retraction.

[0048] For the base 21 mentioned above, please refer to Figures 2 to 4The base 21 can be flat and can be adapted to the feed chamber 11. For example, along the first direction X, the cross-section of the base 21 is adapted to the cross-section of the feed chamber 11, that is, when the base 21 is installed in the feed chamber 11, the edge of the base 21 abuts against the inner wall of the feed chamber 11 to limit the position of the base 21 in the feed chamber 11 perpendicular to the first direction X.

[0049] In some embodiments, please refer to Figures 2 to 4 The number of damping structures 22 is multiple. Multiple damping structures 22 are used for multiple consumables 200 to pass through, so as to increase the damping of multiple consumables 200 relative to the feeding mechanism 100 during feeding and retraction.

[0050] For the damping structure 22 mentioned above, please refer to Figures 2 to 4 The damping structure 22 includes at least two elastic arms 221. The first ends of the at least two elastic arms 221 are connected to the base 21, and the second ends of the at least two elastic arms 221 are used to clamp the consumable 200. Clamping the consumable 200 with the elastic arms 221 increases the frictional force of the consumable 200 when it moves relative to the damping structure 22, thus increasing the damping of the consumable 200 relative to the feeding mechanism 100 during feeding and retraction. Optionally, the elastic arms 221 are made of rubber, silicone, or plastic. Optionally, the elastic arms 221 and the base 21 are an integral structure, meaning they are integrally molded and made of the same material.

[0051] It is understood that the consumable 200 needs to pass through or around the base 21. For example, please refer to... Figure 3 The base 21 is provided with a through hole 211 for the consumable 200 to pass through. Thus, the consumable 200 can pass through the base 21 through the through hole 211. Optionally, there are multiple through holes 211, and the damping structure 22 is provided corresponding to the through holes 211.

[0052] In some other embodiments, the damping structure 22 is a through hole provided in the base 21, through which the consumable 200 passes, and the through hole is interference-fitted with the consumable 200. This causes friction as the consumable 200 moves along the through hole, increasing the damping of the consumable 200 relative to the feeding mechanism 100 during feeding and retraction. In some other embodiments, the damping structure 22 is an enclosing structure (such as a circular tube). When the consumable 200 passes through the enclosing structure, the enclosing structure surrounds the consumable 200 as a whole, enclosing the consumable 200 radially, and is interference-fitted with the consumable 200. This causes friction as the consumable 200 moves along the enclosing structure, increasing the damping of the consumable 200 relative to the feeding mechanism 100 during feeding and retraction.

[0053] It is understood that the gap between the second ends of the elastic arms 221 is smaller than the size of the consumable 200 before the consumable 200 passes through the damping structure 22. In some embodiments, please refer to... Figures 2 to 4 The second end of the elastic arm 221 extends toward the first direction X, and the elastic arm 221 is located on the side of the base 21 facing the first direction X. In this embodiment, the feeding direction of the consumable 200 is the first direction X. When the consumable 200 passes through the damping structure 22, the consumable 200 first passes through the first end of the elastic arm 221, and then passes through the second end of the elastic arm 221. The elastic arm 221 is funnel-shaped with the second end tightened and the first end open. Therefore, the consumable 200 will squeeze the second ends of multiple elastic arms 221 apart to insert between the second ends of multiple elastic arms 221.

[0054] In some embodiments, please refer to Figure 4 and Figure 5 At least two elastic arms 221 have a first surface 2211 at their second ends. When the damping structure 22 clamps the consumable 200, the first surface 2211 of the at least two elastic arms 221 defines at least a portion of the first circle C, and the central axis of the first circle C coincides with the central axis of the through hole 211.

[0055] It should be noted that, Figure 5 The first circle C coincides with the outer circumference of consumable 200.

[0056] The first surface 2211 defines at least a portion of the first circle C, meaning that at least a portion of the first surface 2211 coincides with the first circle C. For example, the first surface 2211 can be a convex spherical surface or a plane. The vertex of the convex spherical surface coincides with the first circle C, so that each elastic arm 221 clamps the consumable 200 through the vertex of the first surface 2211, and the first surface 2211 makes point contact with the consumable 200. The vertex of the convex spherical surface is the point on the convex spherical surface closest to the central axis of the first circle C. Alternatively, the first surface 2211 can be a plane, tangent to the first circle C, so that each elastic arm 221 clamps the consumable 200 through the portion of the first surface 2211 that is tangent to the first circle C, and the first surface 2211 makes line contact with the consumable 200. Furthermore, in this embodiment, the central axis of the first circle C coincides with the central axis of the through hole 211. Therefore, when the elastic arm 221 clamps the consumable 200, the consumable 200 is located at the center of the first circle C and also at the center of the through hole 211, which helps to improve the problem of the consumable 200 scraping against the edge of the through hole 211. Optionally, there are two elastic arms 221. Optionally, the elastic arm 221 is arc-shaped, extending circumferentially along the first circle C, which helps to enhance the bending strength of the elastic arm 221.

[0057] In some embodiments, please refer to Figure 5The first surface 2211 is concave. When the damping structure 22 clamps the consumable 200, the projection of the first surface 2211 coincides with the first circle C along its axial direction. By making the first surface 2211 concave, and with its axis parallel to the axis of the first circle C, the first surface 2211 makes line contact with the consumable 200, increasing the contact area between the first surface 2211 and the consumable 200 and reducing wear on the consumable 200. Furthermore, when the diameter of the consumable 200 is equal to the diameter of the first circle C, the first surface 2211 is in complete contact with the consumable 200, i.e., the first surface 2211 is in surface contact with the consumable 200, increasing the contact area between the elastic arm 221 and the consumable 200.

[0058] In some embodiments, please refer to Figure 3 The base 21 includes a first chamfer 212, which connects the side of the base 21 away from the elastic arm 221 to the inner wall of the through hole 211. When the end of the consumable 200 contacts the first chamfer 212, the first chamfer 212 helps guide the end of the consumable 200 to the through hole 211, improving the problem that the end of the consumable 200 is stuck against the edge of the through hole 211 and cannot pass through the through hole 211. Optionally, the first chamfer 212 is a planar chamfer, for example, the angle between the first chamfer 212 and the inner wall of the through hole 211 is 45 degrees; the first chamfer 212 can also be a curved chamfer, for example, the first chamfer 212 is arc-shaped, and the two ends of the first chamfer 212 can be smoothly connected to the side of the base 21 away from the elastic arm 221 and the inner wall of the through hole 211, respectively.

[0059] In some embodiments, please refer to Figure 4 The second end of the elastic arm 221 is provided with a second chamfer 2212, which connects the first surface 2211 with the end face of the second end of the elastic arm 221. When the consumable 200 is ejected, the second chamfer 2212 can improve the problem of the sharp right angle on the elastic arm 221 scraping the consumable 200. Optionally, the second chamfer 2212 is a planar chamfer, for example, the angle between the second chamfer 2212 and the first surface 2211 is 45 degrees; the second chamfer 2212 can also be a curved chamfer, for example, the second chamfer 2212 is arc-shaped, and the two ends of the second chamfer 2212 can be smoothly connected to the first surface 2211 and the end face of the second end of the elastic arm 221, respectively.

[0060] In some embodiments, please refer to Figure 1 and Figure 2The feeding body 1 is provided with a discharge port 14, which is connected to the feeding chamber 11. The feeding mechanism 100 also includes a discharge component 5, which is provided on the feeding body 1. The discharge component 5 is at least partially located between the feeding port 12 and the discharge port 131. The discharge component 5 is used to deform to avoid the consumable 200 when the front end of the consumable 200 moves from the feeding port 12 toward the discharge port 131. The discharge component 5 is also used to guide the consumable 200 to the discharge port 14 when the rear end of the consumable 200 moves from the discharge port 131 toward the feeding port 12.

[0061] It should be noted that the front end of consumable 200 refers to the end of consumable 200 that is far away from the base 21, while the rear end of consumable 200 refers to the end of consumable 200 that is close to the base 21.

[0062] For example, please refer to Figure 2 One end of the ejector component 5 is connected to the feed body 1 and is located between the ejector port 14 and the damping structure 22. The other end of the ejector component 5 extends in the first direction X and away from the ejector port 14, extending at least partially between the feed port 12 and the discharge port 131. Furthermore, the ejector component 5 is elastic. When the front end of the consumable 200 moves from the feed port 12 towards the discharge port 131, the consumable 200 presses against the ejector component 5, causing the ejector component 5 to deform towards the ejector port 14, thus allowing the ejector component 5 to avoid feeding the consumable 200. As the rear end of consumable 200 moves from the discharge port 131 toward the feed port 12, consumable 200 presses against the ejector 5, causing the ejector 5 to deform toward the damping structure 22. Blocked by the damping structure 22, the ejector 5 deforms until it abuts against the damping structure 22 and then stops deforming. At this time, consumable 200 moves toward the ejector port 14 under the guidance of the ejector 5 and finally extends out of the ejector port 14. When consumable 200 extends out of the ejector port 14, consumable 200 can be manually pulled out and removed from the feeding mechanism 100.

[0063] In some embodiments, please refer to Figure 2The damping structure 22 includes a first elastic arm 221a and a second elastic arm 221b. The first end of the first elastic arm 221a and the first end of the second elastic arm 221b are connected to the base 21. The second ends of the first elastic arm 221a and the second elastic arm 221b are used to clamp the consumable 200. Along a direction perpendicular to the feeding direction of the consumable 200, the first ends of the first elastic arm 221a, the second elastic arm 221b, and the ejector 5 are arranged sequentially. The second end of the elastic arm 221 extends towards the outlet 131, and the second end of the ejector 5 extends between the damping structure 22 and the outlet 131. The distance between the second end of the second elastic arm 221b and the base 21 is less than the distance between the second end of the first elastic arm 221a and the base 21. It is understood that in this embodiment, the first elastic arm 221a and the second elastic arm 221b have the same structure as the aforementioned elastic arm 221; for example, the plurality of elastic arms 221 may include the first elastic arm 221a and the second elastic arm 221b.

[0064] Since the ejector 5 extends from the second elastic arm 221b toward the first elastic arm 221a, the second elastic arm 221b easily comes into contact with the ejector 5. For example, when the consumable 200 pushes open the second ends of the multiple elastic arms 221, the second elastic arm 221b easily comes into contact with the ejector 5, causing the consumable 200 to deviate away from the ejector 5. This, in turn, causes the consumable 200 to deviate from the central position of the through hole 211, making it easy for the consumable 200 to come into contact with the edge of the through hole 211 and causing scratches on the consumable 200. In this embodiment, the length of the second elastic arm 221b is less than the length of the first elastic arm 221a, which can improve the problem of the ejector 5 easily coming into contact with the second elastic arm 221b and improve the problem of the consumable 200 deviating from the central position of the through hole 211 and causing scratches on the consumable 200. Furthermore, in this embodiment, since the second elastic arm 221b avoids the ejector 5, the arrangement between the first elastic arm 221a, the second elastic arm 221b and the ejector 5 can be more compact, thereby reducing the volume of the feeding mechanism 100.

[0065] In some embodiments, please refer to Figure 1 and Figure 2The feeding mechanism 100 also includes a driven wheel 6 and a sensor (not shown). The driven wheel 6 is rotatably mounted on the feeding body 1, and its rotation axis is perpendicular to the feeding direction of the consumable 200. The driven wheel 6 is used to contact the consumable 200 and rotate under the drive of the consumable 200. The sensor is used to detect the rotational speed of the driven wheel 6. For example, the discharge pipe 13 is provided with a clearance opening 132. The outer edge of the driven wheel 6 extends into the discharge pipe 13 through the clearance opening 132, so that when the consumable 200 is fed or discharged in the discharge pipe 13, it will drive the driven wheel 6 to rotate. By detecting the rotational speed of the driven wheel 6, the sensor can calculate the feeding speed and discharge speed of the consumable 200, and thus determine whether the consumable 200 is stuck and whether the feeding speed of the consumable 200 is normal.

[0066] In some embodiments, the driven wheel 6 has multiple notches along its circumferential outer edge, and the sensor is a photoelectric sensor that is triggered when a notch is passed. When the driven wheel 6 rotates, the multiple notches pass through the photoelectric sensor in sequence, and the photoelectric sensor is triggered periodically, thereby calculating the rotational speed of the driven wheel 6. Optionally, the outer edge of the driven wheel 6 is serrated.

[0067] Based on the same inventive concept, embodiments of this application provide a printhead assembly (not shown), which includes a feeding mechanism 100. The printhead assembly possesses the structural features and beneficial effects of the feeding mechanism 100, which will not be described in detail here. In some embodiments, the printhead assembly includes a printhead (not shown), the feeding mechanism 100 is used to provide consumable 200 to the printhead, and the printhead is used to thermally melt and print the consumable 200.

[0068] Based on the same inventive concept, this application provides a 3D printing apparatus (not shown), which includes a printhead assembly. The 3D printing apparatus possesses the structural features and beneficial effects of the feeding mechanism 100, which will not be elaborated here. In some embodiments, the 3D printing apparatus includes a printing platform (not shown), and the printhead assembly is used for 3D printing on the printing platform. The printhead assembly is used to translate relative to the printing platform in three directions, such as three mutually perpendicular directions, with one direction perpendicular to the printing platform. The printhead assembly can also be used to rotate relative to the printing platform to enhance the printing effect.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this application as described above, which are not provided in detail for the sake of brevity; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A feed mechanism characterized by, The application relates to a feeding mechanism, comprising: a feeding body provided with a feeding cavity, a feeding port and a discharging port, the feeding port and the discharging port being communicated with the feeding cavity, the feeding port, the feeding cavity and the discharging port being used for a consumable to pass through in sequence; a damping member comprising a base and a damping structure, the base being arranged on the feeding body, the damping structure being located between the feeding port and the discharging port, and the damping structure being used for clamping the consumable.

2. The feeding mechanism according to claim 1, wherein the damping structure comprises at least two elastic arms, first ends of the at least two elastic arms being connected to the base, and second ends of the at least two elastic arms being used for clamping the consumable.

3. The feeding mechanism according to claim 2, wherein the base is provided with a through hole, the through hole being used for the consumable to pass through; the second ends of the at least two elastic arms are provided with first surfaces, the first surfaces of the at least two elastic arms defining at least part of a first circle when the damping structure clamps the consumable, and a central axis of the first circle coinciding with a central axis of the through hole.

4. The feeding mechanism according to claim 3, wherein the first surfaces are concave surfaces, and projections of the first surfaces on the first circle coincide with the first circle when the damping structure clamps the consumable.

5. The feeding mechanism according to claim 3, wherein the base comprises a first chamfer, the first chamfer connecting a side of the base away from the elastic arms and an inner wall of the through hole; and / or the second ends of the elastic arms are provided with second chamfers, the second chamfers connecting the first surfaces and end surfaces of the second ends of the elastic arms.

6. The feeding mechanism according to claim 1, wherein the feeding body is provided with a feeding-out port, the feeding-out port being communicated with the feeding cavity; the feeding mechanism further comprises a feeding-out member, the feeding-out member being arranged on the feeding body, and the feeding-out member being located at least partially between the feeding port and the discharging port; the feeding-out member is used for deforming to avoid the consumable when a front end of the consumable moves from the feeding port to the discharging port, and / or the feeding-out member is used for guiding the consumable to the feeding-out port when a rear end of the consumable moves from the discharging port to the feeding port.

7. The feeding mechanism according to claim 6, wherein the damping structure comprises a first elastic arm and a second elastic arm, first ends of the first elastic arm and the second elastic arm being connected to the base, and second ends of the first elastic arm and the second elastic arm being used for clamping the consumable; in a direction perpendicular to a feeding direction of the consumable, the first elastic arm, the second elastic arm and a first end of the feeding-out member are arranged in sequence, the second ends of the elastic arms extending towards the discharging port, and a second end of the feeding-out member extending to a position between the damping structure and the discharging port; a distance between the second end of the second elastic arm and the base is smaller than a distance between the second end of the first elastic arm and the base.

8. The feeding mechanism according to any one of claims 1 to 7, wherein The feeding mechanism further comprises a driven wheel rotatably arranged on the feeding body, an axis of rotation of the driven wheel being perpendicular to the feeding direction of the consumable, the driven wheel being configured to be in contact with the consumable and to rotate under the driving of the consumable, and a sensor configured to detect a rotation speed of the driven wheel.

9. A printhead assembly, comprising: A printing device comprising the feeding mechanism according to any one of claims 1 to 8.

10. A three-dimensional printing apparatus, characterized by, A printhead assembly comprising the feeding mechanism according to claim 9.

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