Three-dimensional printing material tray holder rotating shaft, three-dimensional printing material tray holder, and three-dimensional printer

Abstract

The present application provides a three-dimensional printing material tray holder rotating shaft, a three-dimensional printing material tray holder, and a three-dimensional printer. The three-dimensional printing material tray holder rotating shaft comprises: a fixed tube; and a sleeve assembly sleeved outside the fixed tube and rotatable relative to the fixed tube, wherein the sleeve assembly is elastically connected to the fixed tube by means of an elastic member, the relative rotation between the sleeve assembly and the fixed tube causes the elastic member to elastically deform, and the sleeve assembly is configured to be sleeved into a three-dimensional printing material tray. According to the present application, convenient installation of a three-dimensional printing material tray and the function of rewinding a filament in the material tray can be achieved, filament winding is prevented, and the structure is simple.

Description

Three-dimensional printing material tray rotating shaft, three-dimensional printing material tray and three-dimensional printer

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on August 25, 2023, with application number 202311086585.9 and application name “A three-dimensional printing material tray rack shaft, three-dimensional printing material tray rack and three-dimensional printer”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of three-dimensional printing, and in particular to a three-dimensional printing material tray rotating shaft, a three-dimensional printing material tray and a three-dimensional printer. Background Art

[0003] A 3D printer (also known as a three-dimensional printer or stereo printer) is a type of rapid prototyping equipment. The 3D printing technology currently available for 3D printers is fused deposition modeling (FDM). FDM is a technology that constructs three-dimensional objects layer by layer using materials such as powdered metal or plastic, based on digital models. Specifically, a 3D printer using FDM technology uses a filament supply mechanism to supply hot-melt filament material to a nozzle, where the hot-melt filament material is heated to a molten state. The nozzle can then extrude the molten material onto the print panel while moving along the 3D printer's printing path, printing out the three-dimensional object layer by layer.

[0004] 3D printers usually have a tray rack, which may include a cylinder that is sleeved into the tray hole of the 3D printing tray. The tray is wrapped with 3D printing material wire, which will be fed into the 3D printer during printing. However, when the material wire needs to be returned by the 3D printer, the returned material wire cannot be tightly wound around the tray, and may even be wrapped outside the tray, thereby affecting subsequent feeding.

[0005] Summary of the Invention

[0006] In view of the above problems, the present application is proposed to provide a 3D printing material tray rack shaft, a 3D printing material tray rack and a 3D printer that overcome the above problems or at least partially solve the above problems.

[0007] In a first aspect of the present application, the present application discloses a 3D printing material tray rotating shaft, comprising:

[0008] Fixed pipe;

[0009] The sleeve assembly is sleeved on the outside of the fixed tube and can rotate relative to the fixed tube. The sleeve assembly is elastically connected to the fixed tube through an elastic member. The relative rotation between the sleeve assembly and the fixed tube will cause the elastic member to produce elastic deformation. The sleeve assembly is used to be sleeved in the three-dimensional printing material tray.

[0010] Optionally, the sleeve assembly includes:

[0011] an inner cylinder assembly, sleeved on the outside of the fixed tube and capable of rotating relative to the fixed tube, wherein the inner cylinder assembly is elastically connected to the fixed tube via the elastic member, and the relative rotation between the inner cylinder assembly and the fixed tube causes the elastic member to generate elastic deformation;

[0012] The outer cylinder assembly is sleeved on the outside of the inner cylinder assembly and is used to be sleeved in the three-dimensional printing material tray; the outer cylinder assembly can rotate relative to the inner cylinder assembly, and the outer cylinder assembly and the inner cylinder assembly are abutted against each other through an abutment member to generate a friction force for hindering the rotation of the outer cylinder assembly relative to the inner cylinder assembly.

[0013] Optionally, a limiting structure is included between the fixed tube and the inner cylinder assembly, and the limiting structure is used to limit the rotation angle of the inner cylinder assembly relative to the fixed tube.

[0014] Optionally, one end of the fixed tube is connected to a plug, and the limiting structure is included between the plug and the inner tube assembly.

[0015] Optionally, the elastic member includes a torsion spring, and the sleeve assembly is elastically connected to the fixed tube via the elastic member, including: a first torsion arm of the torsion spring is connected to the inner tube assembly, and a body and a second torsion arm of the torsion spring are connected to the plug.

[0016] Optionally, the elastic member includes a coil spring, and the sleeve assembly is elastically connected to the fixed tube via the elastic member, including: an inner side of the coil spring is connected to the plug, and an outer side of the coil spring is connected to the plug.

[0017] Optionally, the fixed tube and the plug are in an interference fit, or the fixed tube and the plug are in a fitting relationship that mutually restricts rotation and axial movement; the fixed tube and the inner tube assembly are in a clearance fit, and the inner tube assembly and the outer tube assembly are in a clearance fit.

[0018] Optionally, the three-dimensional printing material tray rack shaft also includes a base plate connected to one end of the outer cylinder assembly, and the abutment is provided on the base plate. The outer cylinder assembly abuts against one end of the inner cylinder assembly, and the abutment abuts against the other end of the inner cylinder assembly.

[0019] Optionally, the abutment member includes a spring sheet, a spring sheet, a leaf spring or a pressure spring.

[0020] Optionally, the elastic member includes a coil spring or a torsion spring.

[0021] Optionally, it also includes:

[0022] At least two elastic support arms are each elastically mounted on the outer edge of the sleeve assembly through an elastic arm; when the elastic arm is in a natural state, the elastic support arm forms a preset angle with respect to the axial direction of the sleeve assembly, so that the distance between the at least two elastic support arms at the first end is closer than the distance between the at least two elastic support arms at the second end, and the at least two elastic support arms extend along the axial direction of the sleeve assembly and are evenly distributed on the outer edge of the sleeve assembly along the circumference of the sleeve assembly, wherein the sleeve assembly is sleeved on the outside of the first end of the fixed tube, and the second end is the other end of the first end.

[0023] Optionally, the sleeve assembly has at least two receiving grooves extending axially along the sleeve assembly and distributed circumferentially along the sleeve assembly, and at least two support arms are respectively installed in the at least two receiving grooves; when the elastic arm is in a compressed state, the at least two elastic support arms fit with the sleeve assembly.

[0024] Optionally, a mounting hole is provided in the receiving groove, the elastic arm comprises a leaf spring, the leaf spring has two elastic plates, and is bent in the middle area of ​​the leaf spring, and the elastic deformation of the leaf spring changes the angle between the two elastic plates.

[0025] The leaf spring is provided with a middle hole in the middle area, and the leaf spring is connected to the mounting hole and the accommodating groove via a first connecting shaft penetrating the middle hole.

[0026] Optionally, the elastic support arm is provided with a circular hole on a side close to the first end of the elastic support arm, and an oblong track hole is provided on a side away from the first end of the elastic support arm, and the axial direction of the oblong track hole is parallel to the direction from the first end of the elastic support arm to the second end of the elastic support arm;

[0027] Side holes are provided at both ends of the leaf spring, the circular hole is pivotally connected to one of the side holes through a second connecting shaft, the third connecting shaft passes through the track hole and the other of the side holes, and the third connecting shaft can slide in the oblong track hole along the axial direction of the oblong track hole to change the angle between the two elastic plates.

[0028] Optionally, it also includes:

[0029] The anti-slip part is arranged on the outer surface of the elastic support arm.

[0030] Optionally, the opening of the first end of the fixing tube has a first shape, the opening of the second end of the fixing tube has a second shape, and the sleeve assembly includes a first sleeve assembly sleeved outside the first end and a second sleeve assembly sleeved outside the second end;

[0031] The first sleeve assembly is elastically connected to the fixed tube via a first elastic member. Relative rotation between the sleeve assembly and the fixed tube causes the first elastic member to generate elastic deformation in a first direction. The first sleeve assembly has a foolproof structure of the first shape. The foolproof structure of the first shape is used to be detachably connected to the first end, so as to facilitate detachable connection of the first sleeve assembly to the first end.

[0032] The second sleeve assembly is elastically connected to the fixed tube through a second elastic member. The relative rotation between the sleeve assembly and the fixed tube causes the second elastic member to produce elastic deformation in a second direction. The second sleeve assembly has an anti-foolproof structure of the second shape. The anti-foolproof structure of the second shape is used to be detachably connected to the second end, so as to be detachably connected to the second sleeve assembly and the second end.

[0033] Optionally, the first-shaped fool-proof structure includes: a plug of the first shape; and the second-shaped fool-proof structure includes a plug of the second shape.

[0034] Optionally, the first direction is clockwise; the second direction is counterclockwise.

[0035] In a second aspect of the present application, the present application discloses a three-dimensional printing material tray rack, comprising:

[0036] Tray rack body;

[0037] As described above, the fixing tube of the 3D printing material tray rack shaft is connected to the material tray rack body.

[0038] In the third aspect of the present application, the present application discloses a three-dimensional printing material tray rack, comprising: a material tray rack body; a fixed tube, rotatably connected to the material tray rack body, and elastically connected to the material tray rack body through an elastic member, the relative rotation between the fixed tube and the material tray rack body will cause the elastic member to produce elastic deformation; a sleeve assembly, used to be sleeved in the three-dimensional printing material tray and can rotate relative to the fixed tube, and the sleeve assembly is used to be sleeved in the three-dimensional printing material tray.

[0039] Optionally, the 3D printing material tray rack further comprises: an abutment member, wherein the sleeve assembly and the fixed tube abut against each other through the abutment member to generate a friction force for hindering the sleeve assembly from rotating relative to the fixed tube.

[0040] In a fourth aspect of the present application, the present application discloses a three-dimensional printer, comprising: the three-dimensional printing material tray rack shaft as described above, wherein one end of the fixed tube away from the sleeve assembly is connected to the frame of the three-dimensional printer.

[0041] In a fifth aspect of the present application, the present application discloses a three-dimensional printer, the three-dimensional printer material tray rack as described above, wherein the material tray rack body is connected to the frame of the three-dimensional printer.

[0042] This application includes the following advantages:

[0043] The present application uses the elastic deformation generated by the relative rotation between the sleeve assembly and the fixed tube, so that when feeding, the material line pulls the material tray to rotate, driving the sleeve assembly to rotate accordingly, and the relative rotation between the sleeve assembly and the fixed tube causes the elastic part to produce elastic deformation; when returning the material, the material line is released back to the material tray, and the elastic deformation of the elastic part begins to recover, releasing the rebound force, causing the sleeve assembly to reverse, driving the material tray to reverse, so that the returned material line can be rewound around the material tray to prevent the returned material line from loosening; and there is no need to add an additional complex driving structure, so that the structure of the three-dimensional printing material tray rack shaft is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] FIG1 is a schematic structural diagram of a rotating shaft of a 3D printing material tray rack of the present application;

[0045] FIG2 is a schematic diagram of the distribution of elastic support arm modules of a rotating shaft of a 3D printing material tray rack of the present application;

[0046] FIG3 is a schematic structural diagram of an elastic support arm module of a rotating shaft of a 3D printing material tray rack of the present application;

[0047] FIG4 is a schematic diagram of the connection between a rotating shaft of a 3D printing material tray rack and a material tray of the present application;

[0048] FIG5 is a schematic diagram of a first state of an elastic support arm module of a rotating shaft of a 3D printing material tray rack of the present application;

[0049] FIG6 is a schematic diagram of a second state of an elastic support arm module of a rotating shaft of a 3D printing material tray rack of the present application;

[0050] FIG7 is a schematic diagram of a foolproof structure of a first shape of a rotating shaft of a 3D printing material tray rack of the present application;

[0051] FIG8 is a schematic diagram of a second shape foolproof structure of a rotating shaft of a 3D printing material tray rack of the present application;

[0052] FIG9 is a schematic structural diagram of a three-dimensional printing material tray rack of the present application.

[0053] Explanation of Reference Numerals: 100 - fixed tube, 200 - sleeve assembly, 210 - inner cylinder assembly, 220 - outer cylinder assembly, 300 - elastic member, 400 - abutting member, 500 - plug, 600 - bottom plate, 700 - friction assembly, 800 - elastic support arm, 810 - elastic arm, 820 - receiving groove, 830 - first connecting shaft, 840 - second connecting shaft, 850 - third connecting shaft, 910 - foolproof structure of first shape, 920 - foolproof structure of second shape;

[0054] 10-material tray rack body, 20-3D printing material tray rack shaft. DETAILED DESCRIPTION

[0055] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the connection in the present application includes detachable connections and non-detachable connections. For example, the fixed connection may include a detachable fixed connection and a non-detachable fixed connection, the rotational connection may include a detachable rotational connection and a non-detachable rotational connection, and the sliding connection may include a detachable sliding connection and a non-detachable sliding connection. The connection can also be a direct connection or an indirect connection through a component. For example, a detachable fixed connection refers to a state in which the positional relationship between at least two connected objects can be fixed in the installed state; similarly, there are also rotating connections, sliding connections, etc.

[0056] 1 , which shows a schematic structural diagram of a 3D printing material tray shaft of the present application, the 3D printing material tray shaft may specifically include the following parts:

[0057] Fixed tube 100;

[0058] The sleeve assembly 200 is sleeved on the outside of the fixed tube 100 and can rotate relative to the fixed tube 100. The sleeve assembly 200 is elastically connected to the fixed tube 100 through an elastic member 300. The relative rotation between the sleeve assembly 200 and the fixed tube 100 will cause the elastic member 300 to produce elastic deformation. The sleeve assembly 200 is used to be sleeved in the three-dimensional printing material tray.

[0059] In the present application, the 3D printer material tray shaft comprises at least a fixed tube 100, a sleeve assembly 200, and an elastic member 300 disposed between the fixed tube 100 and the sleeve assembly 200. The fixed tube 100 serves as a load-bearing foundation, and the other components of the 3D printer material tray shaft are directly or indirectly supported by the fixed tube 100. The fixed tube 100 can be mounted on the 3D printer, specifically at the end away from the sleeve assembly 200, specifically externally on the printer's housing, or on the printer's frame (X-axis, Z-axis, or Y-axis). It can also be mounted on a material tray stand that is independent of the 3D printer, specifically on the base or frame of the material tray stand. The fixed tube 100 can be mounted with either a non-detachable or detachable connection. The fixed tube 100 can be a solid or hollow tube. The material of the fixed tube 100 is not limited. In one example of the present application, the fixed tube 100 is a hollow aluminum tube.

[0060] A sleeve assembly 200 is connected to one or both ends of the fixed tube 100. Specifically, one end of the fixed tube 100 may be the end away from the 3D printer, base, or bracket. The sleeve assembly 200 is sleeved onto the outer side of the fixed tube 100 and is coaxial with the fixed tube 100. The sleeve assembly 200 can rotate relative to the fixed tube 100, that is, the sleeve assembly 200 can rotate clockwise or counterclockwise on the fixed tube 100. An elastic member 300 is located between the sleeve assembly 200 and the fixed tube 100. The sleeve assembly 200 is elastically connected to the fixed tube 100 via the elastic member 300. When the sleeve assembly 200 rotates relative to the fixed tube 100, it compresses or stretches the elastic member 300, causing the elastic member 300 to undergo elastic deformation. For example, when the material tray rotates, the sleeve assembly 200 rotates relative to the fixed tube 100, causing the elastic member 300 to undergo elastic deformation. The sleeve assembly 200 is sleeved in the 3D printing material tray, that is, the sleeve assembly 200 is sleeved in the material tray hole of the 3D printing material tray to support and position the 3D printing material tray.

[0061] In an optional implementation of the present application, the sleeve assembly 200 includes:

[0062] The inner cylinder assembly 210 is sleeved on the outside of the fixed tube 100 and can rotate relative to the fixed tube 100. The inner cylinder assembly 210 is elastically connected to the fixed tube 100 via the elastic member 300. The relative rotation between the inner cylinder assembly 210 and the fixed tube 100 causes the elastic member 300 to produce elastic deformation.

[0063] The outer cylinder assembly 220 is sleeved on the outside of the inner cylinder assembly 210 and is used to be sleeved in the three-dimensional printing material tray; the outer cylinder assembly 220 can rotate relative to the inner cylinder assembly 210, and the outer cylinder assembly 220 and the inner cylinder assembly 210 are abutted against each other through the abutment 400 to generate a friction force for hindering the rotation of the outer cylinder assembly 220 relative to the inner cylinder assembly 210.

[0064] The inner cylinder assembly 210 is sleeved on the outer edge of the fixed tube 100 and can rotate relative to the fixed tube 100. One end of the inner cylinder assembly 210 is elastically connected to the fixed tube 100 via an elastic member 300. That is, when the inner cylinder assembly 210 rotates relative to the fixed tube 100, the inner cylinder assembly 210 compresses the elastic member 300, causing the elastic member 300 to elastically deform.

[0065] In an optional implementation of the present application, a limiting structure is included between the fixed tube 100 and the inner cylinder assembly 210 , and the limiting structure is used to limit the rotation angle of the inner cylinder assembly 210 relative to the fixed tube 100 .

[0066] The outer cylinder assembly 220 is sleeved onto the outer edge of the inner cylinder assembly 210, and the outer cylinder assembly 220 can rotate freely relative to the inner cylinder assembly 210. The outer edge of the outer cylinder assembly 220 is used to connect with the mounting hole of the material tray to support the material tray. In other words, the material tray can drive the outer cylinder assembly 220 to rotate. The outer cylinder assembly 220 and the inner cylinder assembly 210 are abutted against each other by the abutment member 400. When the outer cylinder assembly 220 and the inner cylinder assembly 210 rotate, the abutment member 400 generates pressure between the outer cylinder assembly 220 and the inner cylinder assembly 210, thereby generating a static friction force that resists the rotation of the outer cylinder assembly 220 relative to the inner cylinder assembly 210. As the tray drives the outer cylinder assembly 220 to rotate, the outer cylinder assembly 220 drives the inner cylinder assembly 210 to rotate relative to the fixed tube 100. When the inner cylinder assembly 210 continues to rotate, causing the elastic deformation of the elastic member 300 to accumulate to a certain extent or the inner cylinder assembly 210 is restricted and cannot rotate relative to the fixed tube, the inner cylinder assembly 210 stops rotating relative to the fixed tube 100 and the outer cylinder assembly 220 begins to rotate relative to the inner cylinder assembly 210. The inner cylinder assembly 210 and the outer cylinder assembly 220 are preferably made of a low-friction, highly wear-resistant plastic material, such as POM (polyoxymethylene) or nylon. The pressure exerted by the abutment member 400 on the outer cylinder assembly 220 and the inner cylinder assembly 210 can be either axial or radial. The friction generated by the abutment member 400 between the inner cylinder assembly 210 and the outer cylinder assembly 220 can cause the elastic deformation of the elastic member 300 to accumulate during the feeding process. This accumulated elastic deformation can be used to drive the sleeve assembly to reverse, thereby driving the feed tray to reverse.

[0067] At least one limiting structure can be provided between the fixed tube 100 and the inner cylinder assembly 210. This limiting structure can be located at the end where the fixed tube 100 connects to the inner cylinder assembly. This limiting structure is used to limit the rotation angle of the inner cylinder assembly 210 relative to the fixed tube 100. By adjusting the circumferential contact position between the limiting structure and the inner cylinder assembly 210, different angular limits can be set to achieve different reversal (rewind) angles / lengths.

[0068] Furthermore, one end of the fixing tube 100 is connected to a plug 500 , and the limiting structure is provided between the plug 500 and the inner cylinder assembly 210 .

[0069] A plug 500 is connected to one or both ends of the fixed tube 100. Specifically, one end of the fixed tube 100 may be the end away from the 3D printer, base, or bracket. This plug 500 seals one end of the fixed tube 100, thereby positioning the sleeve assembly 200 on the fixed tube 100. A limiting structure can be provided between the plug 500 and the inner cylinder assembly 210, and the plug 500 and the limiting structure are used to adjust the rotation range of the inner cylinder assembly 210.

[0070] In an optional implementation of the present application, the elastic member 300 includes a torsion spring, and the sleeve assembly 200 is elastically connected to the fixed tube 100 through the elastic member 300, including: the first torsion arm of the torsion spring is connected to the inner tube assembly 210, and the body and the second torsion arm of the torsion spring are connected to the plug 500, so that the sleeve assembly 200 is elastically connected to the fixed tube 100.

[0071] In an optional implementation of the present application, the elastic member 300 includes a coil spring, and the sleeve assembly 200 is elastically connected to the fixed tube 100 through the elastic member 300, including: the inner side of the coil spring is connected to the plug 500, and the outer side of the coil spring is connected to the plug 500.

[0072] As the inner cylinder assembly 210 rotates, the coil spring is compressed, causing it to elastically deform, accumulating force for rotating the reel or rewinding the wire. Different rewinding force curves can be achieved by adjusting the coil spring thickness, number of turns, width, material, and preload angle. The coil spring material is preferably stainless steel or spring steel with a high fatigue life.

[0073] Furthermore, the fixed tube 100 and the plug 500 are in an interference fit, or the fixed tube 100 and the plug 500 are in a cooperation relationship that mutually restricts rotation and axial movement, the fixed tube 100 and the inner tube assembly 210 are in a clearance fit, and the inner tube assembly 210 and the outer tube assembly 220 are in a clearance fit.

[0074] The fixing tube 100 and the plug 500 are interferingly fixed to each other through their dimensional relationship. The fixing tube 100 and the plug 500 are mutually restricted in rotation and axial movement, allowing the plug 500 to be securely connected to the fixing tube 100 without the use of a connector.

[0075] The cooperation relationship between the fixing tube 100 and the plug 500 in limiting axial movement can be achieved through an axial snap connection. The mutual rotation limitation between the fixing tube 100 and the plug 500 can be achieved through a circumferential limiting connection structure.

[0076] The fixed tube 100 and the inner cylinder assembly 210 are loosely matched, and the inner cylinder assembly 210 and the outer cylinder assembly 220 are loosely matched, so that there is a low friction between the inner cylinder assembly 210 and the fixed tube 100 and between the inner cylinder assembly 210 and the outer cylinder assembly 220, making the relative rotation between the inner cylinder assembly 210 and the outer cylinder assembly 220 easier.

[0077] In an optional implementation of the present application, the 3D printing material tray rack shaft further includes:

[0078] The bottom plate 600 is connected to one end of the outer cylinder assembly 220 . The abutment member 400 is provided on the bottom plate 600 . The outer cylinder assembly 220 abuts against one end of the inner cylinder assembly 210 , and the abutment member 400 abuts against the other end of the inner cylinder assembly 210 .

[0079] The base plate 600 is connected to one end of the outer cylinder assembly 220, which can be the end of the outer cylinder assembly 220 away from the plug 500. The connection between the base plate 600 and the outer cylinder assembly 220 can be achieved through a snap-fit ​​mechanism to facilitate removable assembly. The outer cylinder assembly 220 abuts against one end of the inner cylinder assembly 210 to position the outer cylinder assembly 220 on the inner cylinder assembly 210. An abutment 400 is provided on the base plate 600. This abutment 400 abuts against the other end of the inner cylinder assembly 210, generating a certain pressure, providing a constant frictional force during relative rotation between the inner and outer cylinder assemblies 210, 220. The abutment 400 can be an elastomeric member such as a spring, leaf spring, wire spring, leaf spring, or pressure spring. In one embodiment of the present application, the abutment 400 is a spring, i.e., a ring of spring is attached to the end of the base plate 600. The elastic portion of the spring abuts against the inner cylinder assembly 210 to generate axial pressure. In one optional implementation of the present application, in another optional implementation, the abutment 400 may also be directly provided on the inner cylinder assembly 210 or the outer cylinder assembly 220, and directly abut against the other of the inner cylinder assembly 210 and the outer cylinder assembly 220 to generate radial or axial pressure.

[0080] In this application, an abutment member 400 is directly disposed between the outer cylinder assembly 220 and the inner cylinder assembly 210, connecting the outer cylinder assembly 220 and the inner cylinder assembly 210 via the abutment member 400. Specifically, one end of the abutment member 400 is connected to the outer cylinder assembly 220, and the other end is connected to the inner cylinder assembly 210. The abutment member 400 is a leaf spring or a pressure spring; the elastic parameters of the leaf spring or pressure spring can be determined based on requirements. The abutment member 400 generates radial or axial pressure between the outer cylinder assembly 220 and the inner cylinder assembly 210, thereby generating friction.

[0081] In addition, referring to FIG. 3 , the 3D printer tray shaft further includes a friction assembly 700 , which is located between the fixed tube 100 and the inner cylinder assembly 210 and is used to provide rotational resistance between the fixed tube 100 and the inner cylinder assembly 210 .

[0082] The friction assembly 700 is located between the fixed tube 100 and the inner cylinder assembly 210, with one side connected to the fixed tube 100 and the other side connected to the inner cylinder assembly 210. When the inner cylinder assembly 210 rotates relative to the fixed tube 100, it provides a certain rotation resistance.

[0083] Furthermore, the 3D printer material tray shaft also includes at least two elastic support arms 800, each of which is elastically mounted on the outer edge of the sleeve assembly 200 through an elastic arm 810; when the elastic arm 810 is in a natural state, the elastic support arm 800 forms a preset angle with respect to the axial direction of the sleeve assembly 200, so that the distance between the at least two elastic support arms 800 at the first end is closer than the distance between the at least two elastic support arms 800 at the second end, and the at least two elastic support arms 800 extend along the axial direction of the sleeve assembly 200 and are evenly distributed on the outer edge of the sleeve assembly 200 along the circumference of the sleeve assembly 200, wherein the sleeve assembly 200 is sleeved on the outside of the first end of the fixed tube 100, and the second end is the other end of the first end.

[0084] At least two elastic support arms 800 can be provided on the rotating shaft of the 3D printer material tray. The elastic support arms 800 are elastically mounted on the outer edge of the sleeve assembly 200 through elastic arms 810. The elastic support arms 800 rotate together with the sleeve assembly 200.

[0085] When the elastic arm 810 is in its natural state, the elastic support arm 800 forms a predetermined angle relative to the axial direction of the sleeve assembly 200, so that the distance between the at least two elastic support arms 800 at the first end is closer than the distance between the at least two elastic support arms 800 at the second end. The sleeve assembly 200 is sleeved outside the first end of the fixed tube 100, and the second end is the other end of the first end; that is, the elastic support arm 800 is tilted toward the side closer to the fixed tube 100 connected to the outside. The distance between the at least two elastic support arms 800 at the first end is smaller than the distance between the at least two elastic support arms 800 at the second end. This facilitates the alignment of the center hole of the material tray before installation, making the installation operation more convenient. As shown in Figure 5, when the elastic support arm 800 is in its natural state, the elastic support arm 800 forms a fixed angle relative to the axial direction of the sleeve assembly 200, which facilitates the alignment of the center hole of the material tray before installation. As shown in Figure 6, when the tray is installed, the center hole of the tray pushes the support arm and simultaneously presses down the elastic arm 810. The elastic arm 810 itself deforms, enabling the elastic support arm 800 to adapt to the different diameters and cross-sections of the tray center hole and provide radial support force to fix the tray. Through the expansion state of at least two elastic support arms 800, adaptive adjustment is made to guide the installation of the tray and fix the tray to be compatible with different trays. Compared with the common sleeve whose diameter is much smaller than the inner diameter of the tray center hole, this solves the problem of unstable force and creeping when the tray rotates on the tray rack, thereby affecting the stability of extrusion.

[0086] At least two elastic support arms 800 extend axially along the sleeve assembly 200 and are evenly distributed along the circumference of the sleeve assembly 200 on the outer edge of the sleeve assembly 200. Referring to Figure 2 , at least two elastic support arms 800 are evenly distributed on the outer edge of the sleeve assembly 200. As shown in Figure 2 , when there are three elastic support arms 800, the three elastic support arms 800 are spaced 60 degrees apart from each other to ensure even distribution on the outer edge of the sleeve assembly 200.

[0087] In an optional implementation of the present application, the sleeve assembly 200 has at least two receiving grooves 820 extending axially along the sleeve assembly 200 and distributed circumferentially along the sleeve assembly 200, and at least two support arms are respectively installed in the at least two receiving grooves 820; when the elastic arm 810 is in a compressed state, the at least two elastic support arms 800 are in contact with the sleeve assembly 200.

[0088] At least two receiving grooves 820 are provided along the axial direction of the sleeve assembly 200 and along the circumference of the sleeve assembly 200. Each receiving groove 820 corresponds to an elastic support arm 800 and its elastic arm 810. Each elastic support arm 800 and its elastic arm 810 are installed in the corresponding receiving groove 820, and when the elastic arm 810 of each elastic support arm 800 is in a compressed state, at least a portion of the elastic support arm 810 is embedded in the receiving groove 820. Referring to FIG. 4 , when the elastic arm 810 of each elastic support arm 800 is in the maximum compressed position of the compressed state, the elastic support arm 800 is completely embedded in the receiving groove 820 and fits closely with the sleeve assembly 200.

[0089] Specifically, referring to Figures 5 and 6 , the receiving groove 820 is provided with a mounting hole, and the elastic arm 810 includes a leaf spring having two elastic plates bent in the middle region of the leaf spring. The elastic deformation of the leaf spring changes the angle between the two elastic plates. The leaf spring is provided with a middle hole in the middle region, and the leaf spring is connected to the receiving groove 820 via a first connecting shaft 830 that passes through the middle hole and the mounting hole. The two elastic plates are used to elastically support the elastic support arm 800.

[0090] A through-hole mounting hole is provided in the receiving groove 820. The elastic arm 810 includes a leaf spring, with each side of the leaf spring being one of two elastic plates. The two elastic plates are bent in the middle region of the leaf spring. When the leaf spring elastically deforms, the angle between the two elastic plates changes. For example, when the leaf spring is compressed, the elastic deformation of the leaf spring increases the angle between the two elastic plates. Conversely, when the leaf spring is released, the elastic deformation of the leaf spring decreases the angle between the two elastic plates. The angle between the two elastic plates is no greater than 180 degrees.

[0091] The leaf spring is provided with a middle hole in its middle area. The leaf spring passes through the middle hole through the first connecting shaft 830. The two ends of the first connecting shaft 830 are inserted into the mounting holes of the accommodating groove 820, so that the middle hole of the leaf spring is connected with the mounting hole of the accommodating groove 820, thereby realizing the connection between the leaf spring and the accommodating groove 820.

[0092] In addition, the elastic arm 810 may also include a torsion spring, which connects the elastic support arm 800 and the receiving slot 820. The torsion spring may also be connected to the receiving slot via a first connecting shaft that passes through the torsion spring body and the mounting hole. The two torsion arms of the torsion spring are also used to support the elastic support arm 800.

[0093] In an optional implementation of the present application, the elastic support arm 800 is provided with a circular hole on a side close to the first end of the elastic support arm 800, and an elongated track hole is provided on a side away from the first end of the elastic support arm 800, and the axial direction of the elongated track hole is parallel to the direction from the first end of the elastic support arm 800 to the second end of the elastic support arm 800; side holes are provided at both ends of the leaf spring, the circular hole is pivotally connected to one of the side holes through a second connecting shaft 840, and a third connecting shaft 850 passes through the track hole and the other of the side holes, and the third connecting shaft 850 can slide in the elongated track hole along the axial direction of the elongated track hole to change the angle between the two elastic plates.

[0094] The circular hole of the elastic support arm 800 is connected to the side hole on one side of the leaf spring via a second connecting shaft 840, while the oblong track hole of the elastic support arm 800 is connected to the side hole on the other side of the leaf spring via a third connecting shaft 850. The third connecting shaft 850 is slidably connected to the oblong track hole, sliding axially within the oblong track hole to change the angle between the two elastic plates. That is, when the leaf spring is compressed or reset, the deformation of the leaf spring causes the third connecting shaft 850 to slide within the oblong track hole, thereby changing the position of the elastic support arm 800. The advantage of this design is that when the leaf spring is in its natural state, the elastic support arm 800 forms a preset angle relative to the axial direction of the sleeve assembly 200. As the leaf spring is compressed, the angle between the elastic support arm 800 and the axial direction of the sleeve assembly 200 gradually decreases. This not only facilitates the installation of the material tray, but also ensures that when the material tray is fixed to the sleeve assembly, the force applied between the two sleeve assemblies is uniform, thus stabilizing the material tray. The first connecting shaft 830, the second connecting shaft 840 and the third connecting shaft 850 can be made of the same material, such as steel. The second connecting shaft 840 and the third connecting shaft 850 have the same diameter so that the two elastic plates of the leaf spring are subjected to similar forces.

[0095] Furthermore, to prevent the tray from slipping circumferentially or axially on the support arm, an anti-slip member (not shown) may be provided on the outer surface of the elastic support arm 800 to provide sufficient friction against the tray. The anti-slip member may be a textured member, such as a knurled pattern, or may be made of an anti-slip material, such as rubber.

[0096] In order to make the present application clear to those skilled in the art, the processes of feeding and returning materials are explained.

[0097] The feeding process will go through two stages: the first stage is the increase of elastic force, low friction and limited rotation, and the second stage is the constant elastic force, high friction and unlimited rotation.

[0098] In the first stage, when the feed motor drives the extruder to extract the material line, the material line provides a tangential pulling force on the material tray, pulling the material tray forward. The leaf spring provides pressure between the material tray and the elastic support arm 800, generating friction. Therefore, the elastic support arm 800 drives the outer cylinder assembly 220 to rotate forward, and the contact surface is always static friction. The abutment 400 provides pressure between the outer cylinder assembly 220 and the inner cylinder assembly 210, generating a large friction force between the outer cylinder assembly 220 and the inner cylinder assembly 210. Therefore, the outer cylinder assembly 220 drives the inner cylinder assembly 210 to rotate forward, and the contact surfaces are static friction. The friction between the inner cylinder assembly 210 and the fixed tube 100 is only dependent on the gravity of the material tray, which is relatively small. Therefore, the inner cylinder assembly 210 rotates relative to the fixed tube 100, and the contact surfaces are sliding friction. As the rotation angle of the inner cylinder assembly 210 relative to the fixed tube 100 increases, the elastic force generated by the elastic member 300 gradually increases until the inner cylinder assembly 210 hits the stopper mechanism of the plug 500. At this point, the elastic force of the elastic member 300 reaches its maximum value and remains constant, and the inner cylinder assembly 210 begins to stop rotating. As the feed motor continues to extract the material line, the material line continues to pull the material tray forward in a tangential direction, entering the second stage. The outer cylinder assembly 220 and the inner cylinder assembly 210 begin to rotate relative to each other, and the contact friction between the contact surfaces changes from static friction to sliding friction. Since there is no stopper between the inner cylinder assembly 210 and the outer cylinder assembly 220, the outer cylinder assembly 220 can continue to rotate forward in the second stage.

[0099] During material withdrawal, the feed motor releases the material line (or drives the extruder to withdraw the material line in reverse). At this time, due to the elastic force stored in the abutment member 400 between the inner cylinder assembly 210 and the fixed tube 100, the inner cylinder assembly 210 begins to reverse relative to the fixed tube 100 under the action of the elastic force, resulting in sliding friction between the contact surfaces. The inner cylinder assembly 210 drives the outer cylinder assembly 220 to rotate, creating static friction between the contact surfaces, ultimately driving the material tray to reverse. This achieves compatibility with the material tray and simplifies installation, as well as allows for material withdrawal and rewinding to prevent entanglement. To ensure the implementation of the above solution, the friction between the outer cylinder assembly 220 and the inner cylinder assembly 210 is greater than the friction between the fixed tube 100 and the inner cylinder assembly 210, and the friction between the outer cylinder assembly 220 and the material tray is the greatest, ensuring that static friction is always maintained.

[0100] In an optional implementation of the present application, the opening at the first end of the fixing tube has a first shape, the opening at the second end of the fixing tube has a second shape, and the sleeve assembly includes a first sleeve assembly sleeved outside the first end and a second sleeve assembly sleeved outside the second end;

[0101] The first sleeve assembly is elastically connected to the fixed tube via a first elastic member. Relative rotation between the sleeve assembly and the fixed tube causes the first elastic member to generate elastic deformation in a first direction. The first sleeve assembly has a foolproof structure of the first shape. The foolproof structure of the first shape is used to be detachably connected to the first end, so as to facilitate detachable connection of the first sleeve assembly to the first end.

[0102] The second sleeve assembly is elastically connected to the fixed tube through a second elastic member. The relative rotation between the sleeve assembly and the fixed tube causes the second elastic member to produce elastic deformation in a second direction. The second sleeve assembly has an anti-foolproof structure of the second shape. The anti-foolproof structure of the second shape is used to be detachably connected to the second end, so as to be detachably connected to the second sleeve assembly and the second end.

[0103] Specifically, the fixed tube in this application can be one or two or more. When there are two fixed tubes, the fixed tube 100 can be connected to the material tray rack body at one end and connected to the sleeve assembly 200 at the other end. When there is only one fixed tube, the fixed tube can pass through the material tray rack body and be connected to the sleeve assembly at both ends.

[0104] Specifically, the first end opening of the fixed tube has a first shape, and the second end opening of the fixed tube has a second shape, wherein the first shape and the second shape are two different shapes. The sleeve assembly includes a first sleeve assembly and a second sleeve assembly, wherein the first sleeve assembly is sleeved onto the outer edge of the first end of the fixed tube, and the second sleeve assembly is sleeved onto the outer edge of the second end of the fixed tube. The elastic member may also include a first elastic member and a second elastic member.

[0105] Referring to Figure 7 , the first-shaped foolproof structure 910 has the same shape and matching dimensions as the first-shaped structure at the first end opening of the stationary tube. The first-shaped foolproof structure 910 mates with the first-shaped structure at the first end opening, allowing for a detachable connection between the first sleeve assembly and the first end of the stationary tube.

[0106] 8 , the second-shaped foolproof structure 920 has the same shape and size as the second-shaped structure at the second end opening of the fixed tube. The second-shaped foolproof structure 920 is detachably connected to the second end through the second-shaped structure at the second end opening of the fixed tube, thereby detachably connecting the second sleeve assembly to the second end of the fixed tube.

[0107] The first-shaped foolproof structure 910 cannot be connected to the second end, and the second-shaped foolproof structure 920 cannot be connected to the first end. Specifically, the first-shaped foolproof structure 910 cannot be connected to the second end of the fixed tube, preventing the second sleeve assembly from being installed on the first end of the fixed tube. The second-shaped foolproof structure 920 cannot be connected to the first end of the fixed tube, preventing the first sleeve assembly from being installed on the second end of the fixed tube.

[0108] Specifically, the first direction is clockwise; the second direction is counterclockwise.

[0109] In the present application, the first direction may be clockwise, that is, the first sleeve assembly rotates clockwise during feeding. The second direction may be counterclockwise, that is, the second sleeve assembly rotates counterclockwise during feeding.

[0110] In addition, the first direction may also be counterclockwise, and correspondingly, the second direction is clockwise.

[0111] In an optional implementation of the present application, the anti-fool structure 910 of the first shape is used to be inserted into the first end opening having the first shape, and the first end opening having the first shape is used to block the insertion of the anti-fool structure 920 of the second shape; the anti-fool structure 920 of the second shape is used to be inserted into the second end opening having the second shape, and the second end opening having the second shape is used to block the insertion of the anti-fool structure 910 of the first shape.

[0112] In the present application, two sets of corresponding sleeve assemblies of the first shape and the second shape are respectively inserted into one end of the corresponding fixed tube without being inserted into the other end, thereby realizing fool-proof connection of the sleeve assemblies at both ends of the fixed tube and avoiding assembly errors of the first sleeve assembly and the second sleeve assembly.

[0113] Furthermore, the fool-proof structure 910 of the first shape is used for snap connection with the first end, and the fool-proof structure 920 of the second shape is used for snap connection with the second end.

[0114] In actual application, the first end and the second end of the fixed pipe can be respectively installed with clips, the first shape of the anti-fool structure 910 is connected to the first end by the clip, and the second shape of the anti-fool structure 920 is connected to the second end by the clip, so that the first shape of the anti-fool structure 910 and the second shape of the anti-fool structure 920 are respectively fixedly connected to the two ends of the fixed pipe in the form of clips.

[0115] In an optional implementation of the present application, the first-shaped fool-proof structure 910 includes: a plug of the first shape; and the second-shaped fool-proof structure 920 includes a plug of the second shape. The first-shaped plug and the second-shaped plug are both plugs 500.

[0116] The first-shaped fool-proof structure 910 includes a first-shaped plug, the innermost side of the first-shaped plug in the circumferential direction is connected to the first-shaped opening of the first end of the fixed tube, and the outer side of the first-shaped plug in the circumferential direction is connected to the first sleeve assembly.

[0117] The second-shaped fool-proof structure 920 includes a second-shaped plug, the innermost side of the second-shaped plug in the circumferential direction is connected to the second-shaped opening of the second end of the fixed tube, and the outer side of the second-shaped plug in the circumferential direction is connected to the second sleeve assembly.

[0118] In an optional implementation of the present application, the insertion portion of the first-shaped plug has a snap-fit ​​structure for snap-fit ​​connection with the inner wall of the first end opening; the insertion portion of the second-shaped plug is a snap-fit ​​structure for snap-fit ​​connection with the inner wall of the second end opening.

[0119] In an optional implementation of the present application, the insertion portion of the first-shaped plug has a snap-fit ​​structure that can be snap-fitted to the inner wall of the first end opening of the fixed tube, so that the first-shaped plug can be fixed in the axial direction of the fixed tube. The insertion portion of the second-shaped plug has a snap-fit ​​structure, and the snap-fit ​​structure of the second-shaped plug uses the same snap-fit ​​method as the snap-fit ​​structure of the first-shaped plug, such as an elastic snap-fit ​​method. The snap-fit ​​structure of the second-shaped plug can be snap-fitted to the inner wall of the second end opening of the fixed tube, so that the second-shaped plug can be fixed in the axial direction of the fixed tube.

[0120] In an optional implementation of the present application, the inner wall of the first end opening has a female head of the first shape, which is used to snap-fit ​​with the insertion part of the first shape plug; the inner wall of the second end opening has a female head of the second shape, which is used to snap-fit ​​with the insertion part of the second shape plug.

[0121] In practical applications, the inner wall of the first end opening has a female connector of a first shape, which mates with the insertion portion of the second end plug. The first end plug and the insertion portion of the first end plug can be fixed to each other. The inner wall of the second end opening has a female connector of a second shape, which mates with the insertion portion of the second end plug. The second end plug and the insertion portion of the second end plug can be fixed to each other.

[0122] In an optional implementation of the present application, the insertion portion of the first-shaped plug includes a first elastic arm buckle with a chamfer, and the insertion portion of the second-shaped plug includes a second elastic arm buckle with a chamfer.

[0123] In the present application, the insertion portion of the first-shaped plug has a chamfered first elastic arm buckle. The chamfered first elastic arm buckle provides a guide for insertion of the first-shaped plug into the inner wall buckle of the first end opening. When the first elastic arm buckle is fully inserted, the elastic force of the elastic arm collides with the inner wall of the first end opening, producing a sound to alert the operator that the plug is fully inserted.

[0124] The insertion portion of the second-shaped plug has a chamfered second spring arm buckle. The chamfered second spring arm buckle guides the insertion portion of the second-shaped plug into the inner wall buckle of the second end opening. When the second spring arm buckle is fully inserted, the spring force of the spring arm collides with the inner wall of the second end opening, producing a sound to indicate to the operator that the plug is fully inserted.

[0125] Specifically, the first shape is a hexagon, which is used to prevent the fool-proof structure 910 of the first shape from rotating relative to the fixed tube.

[0126] In actual application, referring to Figure 7, the first shape is a hexagon, and the first sleeve assembly installed at the first end of the fixed tube is connected and fool-proofed by the hexagon, and the edge of the hexagonal shape is used to prevent the first-shaped fool-proof structure 910 from rotating relative to the fixed tube, so that the first-shaped fool-proof structure 910 can be fixed in the circumferential direction of the fixed tube.

[0127] Specifically, the second shape is a capsule shape, which is used to prevent the second-shaped fool-proof structure 920 from rotating relative to the fixed tube.

[0128] In practical applications, referring to Figure 8 , the first shape is a capsule, which consists of two semicircular ends connected by a rectangle. The capsule prevents the second sleeve assembly, mounted on the second end of the stationary tube, from rotating relative to the stationary tube, thereby securing the second-shaped anti-fouling structure 920 circumferentially.

[0129] The present application realizes that when in use, the center hole of the material tray is roughly aligned with the rotating shaft assembly and then pushed in. The side plate of the material roll contacts the bottom plate 600 and is installed in place. At this time, the support arm has a radially outward elastic force, which supports the center hole of the material roll. Through extrusion and friction, the material roll is relatively fixed to the rotating shaft in the axial and circumferential directions, and the rotating shaft rotates with the material roll, making it compatible with material trays of various sizes and avoiding unstable rotation force and creeping on the material tray rack, which affects the stability of extrusion; and the first elastic member 300 accumulates force, which can eventually drive the material tray to reverse when the material is unloaded. The compatibility and installation of the material tray are simplified, and the material is unloaded and rewound to prevent entanglement. In addition, openings of different shapes are provided at both ends of the fixed tube for foolproofing, which can prevent the first sleeve assembly rotating in the first direction and the second sleeve assembly rotating in the second direction from being assembled incorrectly, thereby avoiding the failure of the material tray to reverse when unloading.

[0130] The present application also discloses a three-dimensional printing material tray rack, comprising:

[0131] Tray rack body 10;

[0132] As described above, the 3D printing material tray rack shaft 20 has a fixed tube connected to the material tray rack body 10 .

[0133] 9 , the 3D printing material tray rack includes a material tray rack body 10 and a 3D printing material tray rack shaft 20 . The fixing tube of the 3D printing material tray rack shaft 20 is connected to the material tray rack body, and the material tray is supported by the 3D printing material tray rack shaft 20 .

[0134] The present application also discloses a three-dimensional printing material tray rack, which may include the following parts: a material tray rack body; a fixed tube, which is rotatably connected to the material tray rack body and elastically connected to the material tray rack body through an elastic member, and the relative rotation between the fixed tube and the material tray rack body will cause the elastic member to produce elastic deformation; a sleeve assembly, which is used to be sleeved in the three-dimensional printing material tray and can rotate relative to the fixed tube, and the sleeve assembly is used to be sleeved in the three-dimensional printing material tray.

[0135] Optionally, the 3D printing material tray rack further comprises: an abutment member, wherein the sleeve assembly and the fixed tube abut against each other through the abutment member to generate a friction force for hindering the sleeve assembly from rotating relative to the fixed tube.

[0136] The tray rack body (for example, the end of the tray rack body away from the tray rack shaft) can be mounted on the 3D printer, specifically, outside the cavity of the 3D printer, or on the frame (X-axis, Z-axis, or Y-axis) of the 3D printer, or on a base or bracket of the tray rack that is relatively independent of the 3D printer. The mounting method can be a fixed connection.

[0137] The present application also discloses a three-dimensional printer, including the three-dimensional printing material tray rack shaft as described above, wherein one end of the fixing tube away from the sleeve assembly is connected to the frame of the three-dimensional printer.

[0138] The present application also discloses a three-dimensional printer, including the above-mentioned material tray rack for the three-dimensional printer, wherein the material tray rack body is connected to the frame of the three-dimensional printer.

[0139] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or terminal device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or terminal device that includes the element.

[0140] The above is a detailed introduction to a 3D printing material tray rack shaft, a 3D printing material tray rack and a 3D printer provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for general technical personnel in this field, based on the ideas of the present application, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present application.

Claims

1. A three-dimensional printing material tray rack shaft, characterized in that: include: Fixed pipe; The sleeve assembly is sleeved on the outside of the fixed tube and can rotate relative to the fixed tube. The sleeve assembly is elastically connected to the fixed tube through an elastic member. The relative rotation between the sleeve assembly and the fixed tube will cause the elastic member to produce elastic deformation. The sleeve assembly is used to be sleeved in the three-dimensional printing material tray.

2. The three-dimensional printing material tray rack shaft according to claim 1, characterized in that: The sleeve assembly comprises: An inner cylinder assembly is sleeved outside the fixed tube and can rotate relative to the fixed tube. The inner cylinder assembly is elastically connected to the fixed tube through the elastic member. The relative rotation between the inner cylinder assembly and the fixed tube causes the elastic member to produce elastic deformation. The outer cylinder assembly is sleeved on the outside of the inner cylinder assembly and is used to be sleeved in the three-dimensional printing material tray; the outer cylinder assembly can rotate relative to the inner cylinder assembly, and the outer cylinder assembly and the inner cylinder assembly are abutted against each other through an abutment member to generate a friction force for hindering the rotation of the outer cylinder assembly relative to the inner cylinder assembly.

3. The three-dimensional printing material tray rack shaft according to claim 2, characterized in that: A limiting structure is provided between the fixed tube and the inner tube assembly, and the limiting structure is used to limit the rotation angle of the inner tube assembly relative to the fixed tube.

4. The three-dimensional printing material tray rack shaft according to claim 3, characterized in that: One end of the fixed tube is connected with a plug, and the limiting structure is included between the plug and the inner tube assembly.

5. The three-dimensional printing material tray rack shaft according to claim 4, characterized in that: The elastic member comprises a torsion spring, and the sleeve assembly is elastically connected to the fixing tube via the elastic member, including: a first torsion arm of the torsion spring is connected to the inner tube assembly, and a body and a second torsion arm of the torsion spring are connected to the plug.

6. The three-dimensional printing material tray rack shaft according to claim 4, characterized in that: The elastic member includes a coil spring, and the sleeve assembly is elastically connected to the fixing tube via the elastic member, including: the inner side of the coil spring is connected to the plug, and the outer side of the coil spring is connected to the plug.

7. The three-dimensional printing material tray rack shaft according to claim 4, characterized in that: The fixed tube and the plug are in an interference fit, or the fixed tube and the plug are in a cooperation relationship of mutually restricting rotation and mutually restricting axial movement; the fixed tube and the inner tube assembly are in a clearance fit, and the inner tube assembly and the outer tube assembly are in a clearance fit.

8. The three-dimensional printing material tray rack shaft according to any one of claims 2 to 7, characterized in that: The three-dimensional printing material tray frame shaft also includes a base plate connected to one end of the outer cylinder assembly. The abutment is arranged on the base plate. The outer cylinder assembly abuts against one end of the inner cylinder assembly, and the abutment abuts against the other end of the inner cylinder assembly.

9. The three-dimensional printing material tray rack shaft according to any one of claims 2 to 8, characterized in that: The abutment member includes a spring sheet, a spring sheet, a leaf spring or a pressure spring.

10. The three-dimensional printing material tray rack shaft according to any one of claims 1 to 4, characterized in that: The elastic member includes a coil spring or a torsion spring.

11. The three-dimensional printing material tray rack shaft according to any one of claims 1 to 10, characterized in that: Also includes: at least two elastic support arms, each elastically mounted on an outer edge of the sleeve assembly via an elastic arm; In the natural state of the elastic arm, the elastic support arm forms a preset angle with respect to the axial direction of the sleeve assembly, so that the distance between the at least two elastic support arms at the first end is closer than the distance between the at least two elastic support arms at the second end, and the at least two elastic support arms extend along the axial direction of the sleeve assembly and are evenly distributed on the outer edge of the sleeve assembly along the circumference of the sleeve assembly, wherein the sleeve assembly is sleeved on the outside of the first end of the fixed tube, and the second end is The other end of the first end.

12. The three-dimensional printing material tray rack shaft according to claim 11, characterized in that: The sleeve assembly has at least two receiving grooves extending axially along the sleeve assembly and distributed circumferentially along the sleeve assembly, and at least two support arms are respectively installed in the at least two receiving grooves; when the elastic arm is in a compressed state, the at least two elastic support arms fit with the sleeve assembly.

13. The three-dimensional printing material tray rack shaft according to claim 12, characterized in that: The receiving groove is provided with a mounting hole, the elastic arm comprises a leaf spring, the leaf spring has two elastic plates and is bent in the middle area of ​​the leaf spring, and the elastic deformation of the leaf spring changes the angle between the two elastic plates. The leaf spring is provided with a middle hole in the middle area, and the leaf spring is connected with the mounting hole and the accommodating groove through a first connecting shaft penetrating the middle hole.

14. The three-dimensional printing material tray rack shaft according to claim 13, characterized in that: The elastic support arm is provided with a circular hole on one side close to the first end of the elastic support arm, and an oblong track hole is provided on the side away from the first end of the elastic support arm, and the axial direction of the oblong track hole is parallel to the direction from the first end of the elastic support arm to the second end of the elastic support arm; Side holes are provided at both ends of the leaf spring, the circular hole is pivotally connected to one of the side holes through a second connecting shaft, the third connecting shaft passes through the track hole and the other of the side holes, and the third connecting shaft can slide in the oblong track hole along the axial direction of the oblong track hole to change the angle between the two elastic plates.

15. The three-dimensional printing material tray rack shaft according to any one of claims 11 to 14, characterized in that: Also includes: The anti-slip part is arranged on the outer surface of the elastic support arm.

16. The three-dimensional printing material tray rack shaft according to any one of claims 1 to 15, characterized in that: The opening of the first end of the fixing tube has a first shape, the opening of the second end of the fixing tube has a second shape, and the sleeve assembly includes a first sleeve assembly sleeved outside the first end and a second sleeve assembly sleeved outside the second end; The first sleeve assembly is elastically connected to the fixed tube via a first elastic member, and the relative rotation between the sleeve assembly and the fixed tube causes the first elastic member to generate elastic deformation in a first direction, and the first sleeve assembly has a foolproof structure of the first shape, and the foolproof structure of the first shape is used to be detachably connected to the first end, so that the first sleeve assembly is detachably connected to the first end; The second sleeve assembly is elastically connected to the fixed tube via a second elastic member, and the relative rotation between the sleeve assembly and the fixed tube causes the second elastic member to produce elastic deformation in a second direction. The second sleeve assembly has an anti-foolproof structure of the second shape, and the anti-foolproof structure of the second shape is used to be detachably connected to the second end, so as to be detachably connected to the second sleeve assembly and the second end.

17. The three-dimensional printing material tray rack shaft according to claim 16, characterized in that: The fool-proof structure of the first shape includes: a plug of the first shape; and the fool-proof structure of the second shape includes a plug of the second shape.

18. The three-dimensional printing material tray rack shaft according to claim 16 or 17, characterized in that: The first direction is clockwise; the second direction is counterclockwise.

19. A three-dimensional printing material tray rack, characterized in that: include: Tray rack body; According to any one of claims 1 to 18, the fixed tube of the 3D printing material tray rack shaft is connected to the material tray rack body.

20. A three-dimensional printing material tray rack, characterized in that: include: Tray rack body; The fixed tube is rotatably connected to the material tray frame and elastically connected to the material tray frame through an elastic member. The relative rotation between the fixed tube and the tray rack body causes the elastic member to produce elastic deformation; The sleeve assembly is used to be sleeved in the three-dimensional printing material tray and can rotate relative to the fixed tube. The sleeve assembly is used to be sleeved in the three-dimensional printing material tray.

21. The three-dimensional printing material tray rack according to claim 20, characterized in that: Also includes: The sleeve assembly and the fixed pipe abut against each other through the abutment member to generate a friction force for hindering the sleeve assembly from rotating relative to the fixed pipe.

22. A three-dimensional printer, characterized in that: include: According to any one of claims 1 to 18, the fixed tube is connected to the frame of the 3D printer.

23. A three-dimensional printer, characterized in that: include: The 3D printer material tray rack according to any one of claims 19 to 21, wherein the material tray rack body is connected to a frame of the 3D printer.

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