Buffer mechanism and 3D printer

Abstract

The utility model relates to a buffer mechanism and a 3D printer. The buffering mechanism is arranged between at least two stages of extrusion mechanisms of the 3D printer. The buffering mechanism comprises a buffering shell; the buffering component is partially and movably arranged in the buffering shell, the buffering component is provided with a conveying channel penetrating in the moving direction of the buffering component, the buffering component is provided with an initial position and a buffering position for buffering the solid wire rod, and the buffering component can move between the initial position and the buffering position; and the detection assembly is arranged corresponding to the buffer part, and the detection assembly is used for detecting the buffer position where the buffer part is located and controlling the extrusion mechanism to work when it is detected that the buffer part is located at the initial position. Therefore, buffering of the solid wires can be achieved, damage caused by accumulation of the solid wires is avoided, and the printing quality is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of 3D printing, in particular to a buffering mechanism and a 3D printer. BACKGROUND

[0002] A fused deposition modeling (FDM) type 3D printer usually adopts a solid wire as a printing consumable, and a melting nozzle of the 3D printer is used to melt and extrude the wire melt in a molten state. The solid wire enters the nozzle under the action of an external force, is heated and melted in the nozzle, and is extruded from the nozzle outlet, and is accumulated layer by layer to print a 3D model.

[0003] At present, the 3D printer usually adopts an extrusion mechanism to push the solid wire, and the extrusion mechanism provides an extrusion force for the solid wire. When the solid wire is transported over a long distance, there is a long distance between a material bin for storing the solid wire and a terminal melting nozzle. In order to ensure the continuity of the solid wire transportation, a plurality of extrusion mechanisms are arranged between the material bin and the melting nozzle, and the two are connected through a feeding pipe.

[0004] When the same solid wire is transported by using a plurality of extrusion mechanisms, if the transportation speeds of the two extrusion mechanisms are not synchronized, the solid wire will be accumulated, and there is a large pressure on the solid wire, which will cause irreversible damage to the solid wire and affect the printing quality. CONTENT OF THE INVENTION

[0005] Based on this, the present application provides a buffering mechanism and a 3D printer, which realizes buffering of the solid wire, facilitates continuous transportation of the solid wire, avoids damage to the solid wire, and ensures the printing quality.

[0006] A buffering mechanism is arranged between at least two extrusion mechanisms of a 3D printer, and the buffering mechanism comprises:

[0007] a buffering shell;

[0008] a buffering component movably arranged in the buffering shell, the buffering component having a transportation channel penetrating in a moving direction thereof, the buffering component having an initial position and a buffering position for buffering the solid wire, and the buffering component being movable between the initial position and the buffering position; and

[0009] a detection assembly arranged corresponding to the buffering component, the detection assembly being used to detect the buffering position of the buffering component.

[0010] In an embodiment of the present application, the detection assembly further comprises a first detection member, the first detection member being located outside the buffering shell and corresponding to the initial position of the buffering component, and the first detection member being used to detect the initial position of the buffering component.

[0011] And / or, the detection assembly comprises a second detection member, which is located outside the buffer housing and corresponds to the buffer position of the buffer member, and is used to detect the buffer position of the buffer member.

[0012] In an embodiment of the present application, the buffer member comprises a buffer body with the conveying channel and a buffer rod, the buffer body is movably arranged in the buffer housing, and the outer wall of the buffer body is attached to the inner wall of the buffer housing.

[0013] The longitudinal cross-sectional dimension of the buffer rod is smaller than that of the buffer body, one end of the buffer rod is arranged in the buffer body, and the other end of the buffer rod movably penetrates the buffer housing.

[0014] In an embodiment of the present application, the buffer body is sealingly arranged in the buffer housing, the buffer body and the buffer member enclose a buffer cavity, and the buffer cavity is sealingly arranged and stores buffer gas.

[0015] The buffer gas in the buffer cavity can make the buffer member be in the initial position.

[0016] In an embodiment of the present application, the buffer mechanism further comprises a sealing member, which is arranged between the buffer body and the buffer housing, and / or the sealing member is arranged between the buffer rod and the buffer housing.

[0017] In an embodiment of the present application, the buffer member further comprises an elastic member, which is arranged between the buffer member and the buffer housing.

[0018] The elastic member provides an elastic force to keep the buffer member in the initial position.

[0019] In an embodiment of the present application, the buffer mechanism comprises at least one of the following features:

[0020] The first feature is that the end of the buffer rod away from the buffer body has a triggering portion, which is used to trigger the detection assembly.

[0021] The second feature is that the buffer mechanism further comprises a first feeding pipe, which is arranged in the conveying channel and is used to output solid wires.

[0022] The third feature is that the buffer member further comprises a first connecting head, which is arranged at the end of the buffer rod away from the buffer body, is used to connect the first feeding pipe of the buffer mechanism, and can trigger the detection assembly.

[0023] In an embodiment of the present application, the buffering mechanism further comprises a support, which is located at one end of the buffering housing away from the conveying channel;

[0024] The support has a mounting hole, which is provided through along the moving direction of the buffering component, and is coaxially arranged and communicated with the conveying channel, and is used for inputting the solid wire into the conveying channel.

[0025] In an embodiment of the present application, the buffering mechanism comprises at least one of the following features:

[0026] The first feature is that the support is arranged in the buffering housing, or the buffering housing and the support are arranged separately with a preset interval.

[0027] The second feature is that the buffering mechanism further comprises a support base, the buffering housing is fixed on the support base, and when the support and the buffering housing are arranged separately, the support is arranged on the support base.

[0028] The third feature is that the buffering mechanism further comprises a second feeding pipe, which is arranged on the support, and is communicated with the conveying channel and used for conveying the solid wire.

[0029] The fourth feature is that the support further has a second connecting head, which is arranged in the mounting hole, and has an inlet channel communicated with the conveying channel.

[0030] A 3D printer comprises at least two-stage extrusion mechanism, a melting nozzle and the buffering mechanism as described in any of the above technical features.

[0031] The at least two-stage extrusion mechanism comprises at least an upper-stage extrusion mechanism and a lower-stage extrusion mechanism, which are arranged separately along the conveying direction of the solid wire, and the buffering mechanism is arranged between the upper-stage extrusion mechanism and the lower-stage extrusion mechanism.

[0032] The lower-stage extrusion mechanism is used for pushing the solid wire to the melting nozzle.

[0033] After adopting the above technical solution, the present application has at least the following technical effects:

[0034] The buffer mechanism and the 3D printer of the present application, the buffer mechanism is arranged between the at least two extrusion mechanisms, the buffer component can move relative to the buffer mechanism between the initial position and the buffer position, and the detection assembly can detect the position of the buffer component, thereby realizing the buffering of the solid wire, facilitating the continuous conveying of the solid wire, avoiding damage to the solid wire, and ensuring the printing quality. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 The buffer mechanism of an embodiment of the present application is in the initial position.

[0036] Figure 2 The buffer mechanism shown in the top view. Figure 1

[0037] Figure 3 The buffer mechanism shown in the cross-sectional view at A-A. Figure 2

[0038] Figure 4 The buffer mechanism shown in the schematic view in the buffer position. Figure 1

[0039] Figure 5 The buffer mechanism shown in the top view. Figure 4

[0040] Figure 6 The buffer mechanism shown in the cross-sectional view at B-B. Figure 5

[0041] Figure 7 The buffer mechanism shown in the schematic view installed between the two-stage extrusion mechanisms. Figure 1

[0042] Wherein: 100, buffer mechanism; 101, buffer cavity; 110, buffer shell; 120, buffer component; 121, conveying channel; 122, buffer main body; 123, buffer rod; 124, first connecting head; 1241, outlet channel; 130, detection assembly; 131, first detection piece; 132, second detection piece; 140, sealing piece; 150, first feeding pipe; 160, support piece; 161, mounting hole; 162, second connecting head; 1621, inlet channel; 170, support base; 180, second feeding pipe; 200, solid wire; 300, upper-stage extrusion mechanism; 400, lower-stage extrusion mechanism. DETAILED DESCRIPTION

[0043] ​​​​​​In order to make the above objectives, features and advantages of the present application more clear and comprehensible, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described herein and by one of ordinary skill in the art without departing from the spirit and scope of the present application, and it is therefore intended that all such variations be considered as falling within the scope of the present application. It should be understood that the use of the terms "include", "comprise" or "contain" herein should not be understood as limiting the present application to the features or steps described herein, but rather the use of these terms is intended to cover the presence of the features or steps described herein as well as the presence of other features or steps not described herein.

[0044] In the description of the present application, it should be understood that, if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0045] In addition, if these terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features referred to. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "a plurality of" appears, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0046] In the present application, unless otherwise specifically defined and limited, if the terms "mount", "connect", "connect", "fix" and the like appear, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements, unless otherwise specifically limited. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0047] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact, or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0048] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0049] Currently, 3D printers typically use an extrusion mechanism to push solid filament and provide extrusion force to it. When the solid filament is transported over long distances, there is a considerable distance between the hopper used to store the solid filament and the molten nozzle at the end. To ensure the continuity of solid filament transport, multiple extrusion mechanisms need to be installed between the hopper and the molten nozzle, and the two need to be connected by a feed tube.

[0050] When the same solid filament is fed by multiple extrusion mechanisms, if the two extrusion mechanisms are not synchronized, the solid filament will accumulate, causing greater pressure on the solid filament and resulting in irreversible damage, thus affecting print quality.

[0051] For this reason, see Figures 1 to 6 This application provides a novel buffer mechanism 100. Figure 1 This is a schematic diagram of the buffer mechanism 100 in its initial position according to an embodiment of this application. Figure 2 for Figure 1 The top view of the buffer mechanism 100 shown. Figure 3 for Figure 2 The cross-sectional view of the buffer mechanism 100 shown at point AA. Figure 4 for Figure 1 The diagram shown illustrates the buffer mechanism 100 in the buffer position. Figure 5 for Figure 4 The top view of the buffer mechanism 100 shown. Figure 6 for Figure 5 The buffer mechanism 100 shown is a cross-sectional view at BB.

[0052] The buffer mechanism 100 is used in a 3D printer and is located between at least two extrusion stages. The buffer mechanism 100 buffers the solid filament 200 conveyed by the extrusion stages to ensure the reliability of the solid filament 200 conveyance. To better illustrate the specific structure of the buffer mechanism 100, the structure of the 3D printer is briefly described here.

[0053] The 3D printer includes a buffer mechanism 100, at least two-stage extrusion mechanisms, and a melting nozzle, as described in this application. (See also...) Figure 1 and Figure 7 , Figure 7 for Figure 1 The diagram shows the buffer mechanism 100 installed between two extrusion mechanisms. In this embodiment, there are two extrusion mechanisms with a certain distance between them, and the buffer mechanism 100 is provided to form an upper-level extrusion mechanism 300 and a lower-level extrusion mechanism 400, which is a two-stage extrusion mechanism.

[0054] Of course, in other embodiments of this application, the number of extrusion mechanisms may be three, four, or even more. The number of extrusion mechanisms is set according to the distance between the hopper storing the solid wire 200 and the melting nozzle, which will not be elaborated here. A buffer mechanism 100 may be provided between each adjacent extrusion mechanism, or a buffer mechanism 100 may be provided between partially adjacent extrusion mechanisms.

[0055] This application only illustrates the case where the buffer mechanism 100 is located between two extrusion mechanisms, for example. Figure 7 As shown, the cooperation between other extrusion mechanisms and solid wire 200 will not be described in detail later.

[0056] The extrusion mechanism provides extrusion force for the movement of the solid filament 200, enabling the solid filament 200 to be pushed. The extrusion mechanism pushes the solid filament 200 into the melting nozzle, which heats the solid filament 200, melting it into a molten filament. The melting nozzle then extrudes the molten filament for printing, thus printing the desired 3D model.

[0057] exist Figure 7In the figure, the left extrusion mechanism is the upper-stage extrusion mechanism 300, the right extrusion mechanism is the lower-stage extrusion mechanism 400, and the buffer mechanism 100 is arranged between the upper-stage extrusion mechanism 300 and the lower-stage extrusion mechanism 400. The upper-stage extrusion mechanism 300 is away from the melting nozzle, and the lower-stage extrusion mechanism 400 is close to the melting nozzle. The upper-stage extrusion mechanism 300 pushes the solid wire 200 to the buffer mechanism 100, and then the solid wire 200 enters the lower-stage extrusion mechanism 400 through the buffer mechanism 100. The lower-stage extrusion mechanism 400 pushes the solid wire 200 to the melting nozzle.

[0058] The buffer mechanism 100 of the present application can buffer the solid wire 200 between the upper-stage extrusion mechanism 300 and the lower-stage extrusion mechanism 400, ensure the synchronization of the movement of the upper-stage extrusion mechanism 300 and the lower-stage extrusion mechanism 400, avoid the accumulation of the solid wire 200 between the upper-stage extrusion mechanism 300 and the lower-stage extrusion mechanism 400, realize the buffering of the solid wire 200, facilitate the continuous conveying of the solid wire 200, avoid the damage to the solid wire 200, and ensure the printing quality.

[0059] In the present application, the solid wire 200 is a printing consumable. Further, the solid wire 200 is taken as an example of a fused filament, i.e., a thermoplastic wire, for illustration. The solid wire 200 can be melted into a wire melt in a molten state after being heated. Optionally, the solid wire 200 can be made of ABS (Acrylonitrile Butadiene Styrene), PLA (polylactic acid), PETG (amorphous copolyester, Petg plastics), PET (Polyethylene terephthalate), or the like.

[0060] The specific structure of the buffer mechanism 100 of an embodiment is described below.

[0061] Referring to Figures 1 to 7In one embodiment, the buffer mechanism 100 includes a buffer housing 110, a buffer component 120, and a detection assembly 130. The buffer component 120 is partially movably disposed within the buffer housing 110. The buffer component 120 has a conveying channel 121 extending through it in its direction of movement. The conveying channel 121 is used to receive solid wire 200 from the previous extrusion mechanism 300 and convey the solid wire 200 to the next extrusion mechanism 400. The buffer component 120 has an initial position and a buffer position for buffering the solid wire 200. The buffer component 120 is capable of moving between the initial position and the buffer position according to the force exerted between it and the solid wire 200. The detection assembly 130 is disposed corresponding to the buffer component 120. The detection assembly 130 is used to control the previous extrusion mechanism 300 to stop when the buffer component 120 is in the buffer position, and to control the previous extrusion mechanism 300 to operate when the buffer component 120 is in the initial position.

[0062] The buffer housing 110 is hollow, and the buffer component 120 is partially located inside the buffer housing 110 and partially located outside the buffer housing 110. The solid wire 200 is along... Figure 3 , Figure 6 and Figure 7 The arrow indicates movement in the direction of movement, meaning the solid wire 200 moves from left to right. This application applies to both left and right directions. Figure 3 , Figure 6 and Figure 7 The direction shown is a reference and will not be described again later. The buffer component 120 has a conveying channel 121 that extends through the solid wire 200 in the direction of movement. The solid wire 200 is movably disposed in the conveying channel 121.

[0063] After the previous extrusion mechanism 300 pushes the solid wire 200 into the conveying channel 121, the solid wire 200 can move along the conveying channel 121 and then enter the next extrusion mechanism 400. Both the previous extrusion mechanism 300 and the next extrusion mechanism 400 can apply extrusion force to the solid wire 200 to achieve the pushing of the solid wire 200. When the previous extrusion mechanism 300 stops, the extrusion force of the next extrusion mechanism 400 can still push the solid wire 200.

[0064] Furthermore, the buffer component 120 is movable. When the buffer component 120 moves, it has an initial position and a buffer position, and can switch between the two. When the buffer component 120 is in the initial position, the upper-level extrusion mechanism 300 and the lower-level extrusion mechanism 400 move synchronously; when the buffer component 100 is in the buffer position, the upper-level extrusion mechanism 300 and the lower-level extrusion mechanism 400 may move asynchronously.

[0065] Understandably, when the upper-level extrusion mechanism 300 and the lower-level extrusion mechanism 400 move synchronously, such as Figures 1 to 3As shown, the feeding speed of the upper-level extrusion mechanism 300 and the lower-level extrusion mechanism 400 is the same. The solid wire 200 will not exert a thrust on the buffer component 120. The buffer component 120 is in the initial position. At this time, the solid wire 200 will not accumulate between the upper-level extrusion mechanism 300 and the lower-level extrusion mechanism 400, thus ensuring the normal conveying of the solid wire 200.

[0066] like Figures 4 to 6 As shown, if the upper-level extrusion mechanism 300 and the lower-level extrusion mechanism 400 do not move synchronously, generally, the feeding speed of the upper-level extrusion mechanism 300 is greater than the feeding speed of the lower-level extrusion mechanism 400, and the extrusion force of the upper-level extrusion mechanism 300 on the solid wire 200 is greater than the extrusion force of the lower-level extrusion mechanism 400 on the solid wire 200. This will cause the amount of solid wire 200 pushed by the upper-level extrusion mechanism 300 to be greater than the amount of solid wire 200 pushed by the lower-level extrusion mechanism 400.

[0067] At this point, there will be a remaining amount of solid wire 200 between the upper-level extrusion mechanism 300 and the lower-level extrusion mechanism 400. When the upper-level extrusion mechanism 300 pushes the solid wire 200, it will push the buffer member 120 relative to the buffer housing 110, causing the buffer housing 110 to move from its initial position to a buffer position. In this way, the buffer member 120 can increase the distance between the upper-level extrusion mechanism 300 and the lower-level extrusion mechanism 400, thus buffering the solid wire 200 and preventing its accumulation.

[0068] During this process, the feeding speed of the previous extrusion mechanism 300 may always be greater than the feeding speed of the next extrusion mechanism 400. Simply having the buffer component 120 in a buffer position may not effectively prevent the accumulation of solid wire 200. Therefore, the buffer mechanism 100 of this application also includes a detection component 130, which is positioned corresponding to the buffer component 120. The detection component 130 can detect the position of the buffer component 120 and then control the previous extrusion mechanism 300 to stop or start based on the position of the buffer component 120.

[0069] like Figures 1 to 3 As shown, when the feeding speed of the upper-level extrusion mechanism 300 is the same as that of the lower-level extrusion mechanism 400, the buffer component 120 is always in its initial position. At this time, the detection component 130 can detect that the buffer component 120 is in its initial position, indicating that no wire is accumulating between the upper-level extrusion mechanism 300 and the lower-level extrusion mechanism 400. The upper-level extrusion mechanism 300 continues to work, and the upper-level extrusion mechanism 300 and the lower-level extrusion mechanism 400 can move synchronously and push the solid wire 200.

[0070] like Figures 3 to 6As shown, when the feeding speed of the upper extrusion mechanism 300 is greater than that of the lower extrusion mechanism 400, the upper extrusion mechanism 300 can push the buffer component 120 to move from the initial position to the buffer position (move from left to right) by the solid wire 200. At this time, the detection assembly 130 can detect that the buffer component 120 is in the buffer position, indicating that the solid wire 200 is accumulated between the upper extrusion mechanism 300 and the lower extrusion mechanism 400.

[0071] Subsequently, the detection assembly 130 can control the upper extrusion mechanism 300 to stop. That is, the upper extrusion mechanism 300 does not push the solid wire 200, and the lower extrusion mechanism 400 can push the accumulated solid wire 200. In this way, the problem of accumulation of the solid wire 200 caused by the different feeding speeds of the upper extrusion mechanism 300 and the lower extrusion mechanism 400 can be avoided, and the pressure on the solid wire 200 caused by the continuous pushing of the upper extrusion mechanism 300 can be avoided, thereby avoiding damage to the solid wire 200.

[0072] As shown in Figures 1 to 3 , Figure 6 When the solid wire 200 accumulated between the upper extrusion mechanism 300 and the lower extrusion mechanism 400 is pushed to completion, the buffer component 120 can move from the buffer position to the initial position (move from right to left). At this time, the detection assembly 130 can detect that the buffer component 120 is in the initial position, indicating that there is no wire accumulation between the upper extrusion mechanism 300 and the lower extrusion mechanism 400. Subsequently, the detection assembly 130 controls the upper extrusion mechanism 300 to continue to work.

[0073] When the feeding speeds of the upper extrusion mechanism 300 and the lower extrusion mechanism 400 are synchronized, the detection assembly 130 detects that the buffer component 120 is in the initial position, and the upper extrusion mechanism 300 works, as shown in Figures 1 to 3 When the feeding speed of the upper extrusion mechanism 300 is not synchronized with that of the lower extrusion mechanism 400, the detection assembly 130 detects that the buffer component 120 is in the buffer position, and controls the upper extrusion mechanism 300 to stop, as shown in Figures 4 to 6 .

[0074] In this way, the buffer mechanism 100 cooperates with the upper extrusion mechanism 300 and the lower extrusion mechanism 400 in the above manner. If the solid wire 200 is accumulated, the upper extrusion mechanism 300 can be controlled to stop, and after the solid wire 200 is not accumulated, the upper extrusion mechanism 300 can be controlled to work, which can realize continuous conveying of the solid wire 200, avoid accumulation of the solid wire 200, and further avoid damage to the solid wire 200 caused by pressure.

[0075] The buffer mechanism 100 of the above embodiment ensures the synchronization of the movement of the upper extrusion mechanism 300 and the lower extrusion mechanism 400 through the cooperation of the buffer component 120 and the detection assembly 130. When the feeding speed of the upper extrusion mechanism 300 is greater than the feeding speed of the lower extrusion mechanism 400, the detection assembly 130 can control the upper extrusion mechanism 300 to stop, and the lower extrusion mechanism 400 pushes the solid wire 200, so as to avoid the accumulation of the solid wire 200 between the upper extrusion mechanism 300 and the lower extrusion mechanism 400, realize the continuous conveying of the solid wire 200, avoid the damage to the solid wire 200, and ensure the printing quality.

[0076] Referring to Figures 1 to 6 In an embodiment, the detection assembly 130 is arranged outside the buffer housing 110, and one end of the buffer component 120 protrudes outside the buffer housing 110 and corresponds to the detection assembly 130. In this way, when the buffer component 120 moves relative to the buffer housing 110, the buffer component 120 can touch the detection assembly 130 outside to realize the detection of the position of the buffer component 120.

[0077] Of course, in other embodiments of the present application, the detection assembly 130 can also be arranged inside the buffer housing 110, as long as the movement of the detection assembly 130 and the buffer component 120 in the buffer housing 110 can interfere with each other.

[0078] The present application only takes the detection assembly 130 located outside the buffer housing 110 as an example for description. In order to better illustrate the working principle of the buffer mechanism 100, the specific structure of the buffer component 120 and the buffer housing 110 is introduced first.

[0079] Referring to Figures 1 to 6 In an embodiment, the buffer component 120 includes a buffer body 122 with a conveying channel 121 and a buffer rod 123. The buffer body 122 is movably arranged in the buffer housing 110, and the outer wall of the buffer body 122 is attached to the inner wall of the buffer housing 110. The longitudinal cross-sectional dimension of the buffer rod 123 is smaller than that of the buffer body 122. One end of the buffer rod 123 is arranged in the buffer body 122, and the other end of the buffer rod 123 movably penetrates the buffer housing 110 and is exposed to the buffer housing 110. The end of the buffer component 120 exposed to the buffer housing 110 can touch the detection assembly 130.

[0080] The longitudinal cross-sectional shape of the buffer body 122 is adapted to the longitudinal cross-section of the inner cavity of the buffer housing 110, and the inner wall of the buffer housing 110 is attached to the outer wall of the buffer body 122. When the buffer component 120 moves, the buffer body 122 can move along the inner wall of the buffer housing 110, and the buffer housing 110 can guide the movement of the buffer component 120, so as to ensure the accuracy of the buffer component 120 between the initial position and the buffer position.

[0081] The buffer rod 123 is arranged on the side of the buffer body 122 and extends along the moving direction of the solid wire 200. Moreover, the end of the buffer rod 123 away from the buffer body 122 extends out of the buffer housing 110. That is, the buffer rod 123 is partially arranged in the buffer housing 110 and partially arranged outside the buffer housing 110. Moreover, when the buffer component 120 moves relative to the buffer housing 110, the buffer rod 123 can move into or out of the buffer housing 110.

[0082] The buffer body 122 and the buffer rod 123 are penetrated along the moving direction of the solid wire 200 to form a conveying passage 121. The solid wire 200 is movably arranged in the conveying passage 121. When the upper-stage extrusion mechanism 300 and the lower-stage extrusion mechanism 400 are out of synchronization, the solid wire 200 can push the buffer body 122 and the buffer rod 123 to move relative to the buffer housing 110, so that the buffer component 120 moves from the initial position to the buffer position. When the upper-stage extrusion mechanism 300 and the lower-stage extrusion mechanism 400 are in synchronization, the buffer body 122 can drive the buffer rod 123 to move from the buffer position to the initial position.

[0083] The end of the buffer rod 123 exposed to the buffer housing 110 can correspond to the detection assembly 130 and can touch the detection assembly 130. When the buffer component 120 is in the initial position, the buffer rod 123 can touch the detection assembly 130 at the initial position, and then the detection assembly 130 controls the upper-stage extrusion mechanism 300 to work. When the buffer component 120 is in the buffer position, the buffer body 122 drives the buffer rod 123 to move, so that the buffer rod 123 touches the detection assembly 130 at the buffer position, and then the detection assembly 130 controls the upper-stage extrusion mechanism 300 to stop working.

[0084] Optionally, the end of the buffer rod 123 away from the buffer body 122 can be provided with a touching piece, and the buffer rod 123 touches the detection assembly 130 through the touching piece. Optionally, the touching piece can be a touching protrusion arranged on the buffer rod 123, and of course, the touching piece can also be other structures capable of enabling the buffer rod 123 to touch the detection assembly 130. The specific structure of the touching piece will be mentioned later.

[0085] Optionally, the buffer body 122 is arranged in a plate shape. That is, the buffer body 122 is a buffer plate, and the buffer body 122 and the buffer rod 123 form a structure similar to a piston. The buffer body 122 can drive the buffer rod 123 to move relative to the buffer housing 110. Optionally, the buffer body 122 is arranged in a circular shape, and the inner cavity of the buffer housing 110 is a cylindrical cavity. Optionally, the buffer housing 110 has a moving hole, and the buffer rod 123 is movably arranged in the moving hole.

[0086] Optionally, the buffer body 122 and the buffer rod 123 are integrated. In this way, the structural strength of the buffer body 122 can be ensured, and the buffer component 120 can be prevented from being broken when moving between the initial position and the buffer position. Of course, in other embodiments of the present application, the buffer body 122 and the buffer rod 123 can be reliably connected through threads or through other ways.

[0087] Referring to Figures 1 to 6 In an embodiment of the present application, the buffer body 122 is sealingly arranged in the buffer housing 110, and the buffer body 122 and the buffer housing 110 surround the buffer cavity 101, and the buffer cavity 101 is sealingly arranged and stores the buffer gas. The buffer gas in the buffer cavity 101 can enable the buffer component 120 to be in the initial position.

[0088] In the present embodiment, the buffer gas is used to reset the buffer component 120. The buffer body 122 is sealingly connected with the buffer housing 110, and the buffer rod 123 is also sealingly connected with the buffer housing 110. As shown in Figure 3 and Figure 6 The buffer body 122 and the buffer housing 110 surround the buffer cavity 101. The buffer cavity 101 is a closed cavity, and the buffer cavity 101 stores the buffer gas.

[0089] When the upper-stage extrusion mechanism 300 and the lower-stage extrusion mechanism 400 move synchronously, the buffer gas can generate pressure on the buffer body 122, so that the buffer component 120 is kept in the initial position. At this time, the volume of the buffer cavity 101 is maximum, as shown in Figure 3 .

[0090] When the upper-stage extrusion mechanism 300 and the lower-stage extrusion mechanism 400 move asynchronously, the pushing force of the solid wire 200 on the buffer component 120 is greater than the pressure of the buffer gas on the buffer body 122. The pushing force can push the buffer body 122 to compress the buffer gas, so that the buffer component 120 moves from the initial position to the buffer position, as shown in Figure 3 The volume of the buffer cavity 101 is reduced, and the pressure of the buffer gas is increased.

[0091] Then, after the detection assembly 130 controls the upper-stage extrusion mechanism 300 to stop, the lower-stage extrusion mechanism 400 pushes the solid wire 200, so that the pushing force of the solid wire 200 on the buffer body 122 is gradually reduced. When the pushing force of the solid wire 200 on the buffer body 122 is less than the pressure of the buffer gas on the buffer body 122, the buffer gas can push the buffer body 122 to reset, i.e., the buffer body 122 returns from the buffer position to the initial position, the volume of the buffer cavity 101 is increased, and the pressure of the buffer gas is gradually reduced. Then, the detection assembly 130 controls the upper-stage extrusion mechanism 300 to work.

[0092] That is, when the upper extrusion mechanism 300 and the lower extrusion mechanism 400 are synchronous, the pressure of the buffer gas on the buffer body 122 keeps the buffer component 120 in the initial position; when the upper extrusion mechanism 300 and the lower extrusion mechanism 400 are not synchronous, the pushing force of the solid wire 200 on the buffer body 122 can overcome the pressure of the buffer gas on the buffer body 122, so that the buffer body 122 compresses the buffer gas, and the buffer component 120 moves from the initial position to the buffer position; when the pushing force of the solid wire 200 on the buffer body 122 is less than the pressure of the buffer gas on the buffer body 122, the buffer gas can push the buffer body 122 from the buffer position to the initial position.

[0093] In this embodiment, when the buffer component 120 is in the initial position, the buffer body 122 is located at the end of the buffer body 122 away from the buffer rod 123. In this way, the volume of the buffer cavity 10 can be ensured to be in a larger state, so that when the solid wire 200 generates a large enough pushing force on the buffer body 122, the buffer component 120 can be moved, and the situation that the upper extrusion mechanism 300 stops due to vibration or accidental generation of pushing force can be avoided.

[0094] Of course, in other embodiments of the present application, when the buffer component 120 is in the initial position, the buffer body 122 can also have a certain distance between the end of the buffer body 122 away from the buffer rod 123.

[0095] Optionally, the buffer gas is air. Of course, in other embodiments of the present application, the buffer gas can also be other gases that can generate pressure after compression, such as inert gas or other types of gas.

[0096] Referring to Figure 3 and Figure 6 In an embodiment, the end of the buffer body 122 away from the buffer housing 110 has an opening. That is, the end of the buffer housing 110 facing the upper extrusion mechanism 300 is in an open structure. The solid wire 200 can extend into the conveying channel 121 through the opening. At the same time, after the buffer body 122 is provided with the opening, when the buffer component 120 moves from the initial position to the buffer position, the left side of the buffer body 122 avoids generating pressure to block the movement of the buffer component 120.

[0097] Of course, in other embodiments of the present application, the end of the buffer housing 110 away from the buffer housing 110 can have a through hole or other structural forms, as long as it can facilitate the movement of the buffer component 120.

[0098] In another embodiment of the present application, the buffer component 120 further comprises an elastic member, which is arranged between the buffer component 120 and the buffer housing 110, and provides an elastic force to keep the buffer component 120 in the initial position. In this embodiment, the elastic member is used to reset the buffer component 120.

[0099] The buffer component 120 is sleeved on the outside of the buffer rod 123, one end of the buffer component 120 abuts against the inner cavity of the buffer housing 110, and the other end of the buffer component 120 abuts against the buffer body 122. Optionally, the elastic member is a spring.

[0100] When the upper-stage extrusion mechanism 300 and the lower-stage extrusion mechanism 400 move synchronously, the elastic force of the elastic member can push the buffer component 120, so that the buffer component 120 is in the initial position. When the upper-stage extrusion mechanism 300 and the lower-stage extrusion mechanism 400 move asynchronously, the pushing force of the solid wire 200 on the buffer body 122 can overcome the elastic force of the elastic member, the buffer component 120 can compress the elastic member, and the buffer component 120 can move from the initial position to the buffer position; when the pushing force of the solid wire 200 on the buffer body 122 is less than the elastic force of the elastic member, the elastic member can move the buffer body 122 from the buffer position to the initial position.

[0101] It is worth noting that the principle between the elastic member and the buffer component 120 is essentially the same as that between the buffer gas and the buffer component 120. The present application only takes the cooperation between the buffer gas and the buffer component 120 as an example for description.

[0102] Referring to Figure 3 and Figure 6 In an embodiment, the buffer mechanism 100 further comprises a sealing member 140, which is arranged between the buffer body 122 and the buffer housing 110, and between the buffer rod 123 and the buffer housing 110. The number of the sealing member 140 is two, one of which is arranged on the outer wall of the buffer body 122 and abuts against the inner wall of the buffer housing 110, and the other is arranged on the outer wall of the buffer rod 123 and abuts against the inner wall of the moving hole.

[0103] The two sealing members 140 ensure the sealing of the buffer housing 110 surrounded by the buffer component 120 and the buffer housing 110, avoid the leakage of the buffer gas, and thus ensure the accurate switching of the buffer component 120 between the initial position and the buffer position, and ensure the accuracy of the movement of the buffer component 120.

[0104] Optionally, the sealing member 140 is a sealing ring. Optionally, the outer wall of the buffer component 120 has a mounting groove, and / or the inner wall of the buffer housing 110 has a mounting groove, and the sealing member 140 is mounted in the mounting groove in an interference fit. In other embodiments of the present application, the sealing member 140 can also be arranged only between the buffer body 122 and the buffer housing 110, or only between the buffer rod 123 and the buffer housing 110.

[0105] Referring to Figures 1 to 7 In an embodiment, the buffer mechanism 100 further comprises a first feeding pipe 150 arranged in the conveying channel 121 and connected to the next-stage extrusion mechanism 400. One end of the first feeding pipe 150 is arranged in the conveying channel 121, and the other end of the first feeding pipe 150 is capable of being connected to the next-stage extrusion mechanism 400.

[0106] The first feeding pipe 150 can guide the movement of the solid wire 200, so that the solid wire 200 can move accurately according to a preset trajectory, and deviation in the conveying of the solid wire 200 is avoided. Optionally, the diameter of the first feeding pipe 150 is greater than the diameter of the solid wire 200, so that the solid wire 200 is prevented from being blocked in the first feeding pipe 150, and the pushing of the solid wire 200 is facilitated.

[0107] Referring to Figures 1 to 6 In an embodiment, the buffer component 120 further comprises a first connecting head 124 arranged at the end of the buffer rod 123, and the first connecting head 124 has an outlet channel 1241 connected to the conveying channel 121. The first feeding pipe 150 is arranged in the outlet channel 1241, and the first connecting head 124 can actuate the detection assembly 130.

[0108] The first connecting head 124 is arranged at the end of the buffer rod 123 away from the buffer body 122, and the first connecting head 124 is hollow. The hollow cavity is the outlet channel 1241. The conveying channel 121 and the outlet channel 1241 are coaxially arranged and connected. The first connecting head 124 is used for mounting the first feeding pipe 150, so that the first feeding pipe 150 is indirectly mounted in the conveying channel 121, and the mounting of the first feeding pipe 150 is facilitated.

[0109] Meanwhile, the first connecting head 124 can also actuate the detection assembly 130. The first connecting head 124 protrudes in the circumferential direction from the buffer rod 123 and is arranged corresponding to the detection assembly 130. When the buffer rod 123 drives the first connecting head 124 to move, the first connecting head 124 can actuate the detection assembly 130 at the initial position or the buffer position.

[0110] Optionally, the first connecting head 124 is a pneumatic connector. Of course, in other embodiments of the present application, the first connecting head 124 can also be a connecting pipe or other structure capable of connecting the buffer rod 123 and the first feeding pipe 150.

[0111] Referring to Figures 1 to 3 In an embodiment, the buffer mechanism 100 further comprises a support 160, which is located at an end of the buffer housing 110 away from the conveying passage 121. The support 160 has a mounting hole 161, which is arranged through the moving direction of the buffer component 120, and is coaxially arranged and communicated with the conveying passage 121, and is used for inputting the solid wire 200 into the conveying passage 121.

[0112] The support 160 is located at an end of the buffer housing 110 away from the buffer rod 123, i.e. the support 160 is located at the left side of the buffer housing 110. The support 160 can support the solid wire 200 to facilitate the solid wire 200 to enter the conveying passage 121. Specifically, the support 160 has the mounting hole 161, and the solid wire 200 enters the mounting passage through the mounting hole 161.

[0113] Optionally, the support 160 is a mounting plate, which has the mounting hole 161. Of course, in other embodiments of the present application, the support 160 can also be a frame structure and the like.

[0114] Referring to Figures 1 to 6 In an embodiment, the buffer housing 110 and the support 160 are separately arranged and have a preset distance. In this embodiment, the buffer housing 110 and the support 160 are separately arranged. The support 160 is located at the end of the buffer housing 110, and the support 160 supports the solid wire 200 to facilitate the solid wire 200 to be conveyed to the conveying passage 121.

[0115] Of course, in other embodiments of the present application, the support 160 is arranged in the buffer housing 110. That is, the support 160 is arranged at the opening of the buffer housing 110.

[0116] Referring to Figures 1 to 6 In an embodiment, the buffer mechanism 100 further comprises a support base 170, the buffer housing 110 is fixed to the support base 170, and when the support 160 is separately arranged with the buffer housing 110, the support 160 is arranged on the support base 170. The support base 170 is the base of the entire buffer mechanism 100, and the support base 170 can carry various components of the buffer mechanism 100, realize integrated arrangement of the buffer mechanism 100, and facilitate installation of the buffer mechanism 100 to the 3D printer.

[0117] Of course, in other embodiments of the present application, the various components of the buffering mechanism 100 can also be directly arranged on the frame of the 3D printer according to their positional relationships.

[0118] Optionally, the edge of the buffering shell 110 has a fixing edge which is arranged protruding from the outer wall of the buffering shell 110 and is fixed to the support base 170 by fasteners such as screws or the like.

[0119] In the present embodiment, the support 160 is arranged on the support base 170 and is in an integrated structure with the support base 170. That is, the support 160 is arranged in an L shape with the support base 170, with the short edge of the support 160 arranged on the left side of the buffering shell 110 and the long edge of the support base 170 arranged below the buffering shell 110. Of course, in other embodiments of the present application, the support 160 and the support base 170 can also be arranged separately.

[0120] Referring to Figures 1 to 7 In an embodiment, the buffering mechanism 100 further comprises a second feeding pipe 180 which is arranged on the support 160, is in communication with the conveying channel 121, and is in communication with the upper-stage extrusion mechanism 300. One end of the second feeding pipe 180 is arranged in the mounting hole 161 of the support 160, and the other end of the second feeding pipe 180 is capable of being in communication with the upper-stage extrusion mechanism 300.

[0121] The second feeding pipe 180 is capable of guiding the movement of the solid wire 200 so that the solid wire 200 can accurately move along a preset trajectory, avoiding deviation in the conveying of the solid wire 200. Optionally, the diameter of the second feeding pipe 180 is greater than the diameter of the solid wire 200, avoiding blockage of the second feeding pipe 180 by the solid wire 200 and facilitating the pushing of the solid wire 200.

[0122] In this way, the upper-stage extrusion mechanism 300 pushes the solid wire 200 into the second feeding pipe 180, the solid wire 200 enters the conveying channel 121 through the mounting hole 161 along the second feeding pipe 180, and then enters the first feeding pipe 150 through the outlet channel 1241 of the conveying channel 121, and further enters the next-stage extrusion mechanism.

[0123] Referring to Figures 1 to 6 In an embodiment, the support 160 further has a second connecting head 162 which is arranged in the mounting hole 161 and has an inlet channel 1621 in communication with the conveying channel 121. The second connecting head 162 is arranged in the mounting hole 161 of the support 160 and is arranged in a hollow structure, with the hollow cavity being the inlet channel 1621.

[0124] The inlet channel 1621 is coaxially arranged with the outlet channel 1241 and is in communication with the outlet channel 1241. The second connecting head 162 is used to mount the second feeding pipe 180, so that the second feeding pipe 180 is indirectly mounted into the mounting hole 161, facilitating the mounting of the second feeding pipe 180. Optionally, the second connecting head 162 is a pneumatic connecting head. Of course, in other embodiments of the present application, the second connecting head 162 can also be a connecting pipe or other structure capable of connecting the second feeding pipe 180.

[0125] Referring to Figures 1 to 4 In an embodiment, the detection assembly 130 further comprises a first detection member 131, which is located outside the buffer housing 110 and is used to detect that the buffer member 120 is in the initial position and control the previous-stage extrusion mechanism 300 to stop.

[0126] The first detection member 131 is arranged on the support base 170 and is arranged in correspondence with the initial position of the buffer rod 123. When the buffer member 120 is in the initial position, the buffer rod 123 can touch the first detection member 131, and when the buffer member 120 moves from the buffer position to the initial position, the buffer rod 123 can also touch the first detection member 131. After the buffer rod 123 touches the first detection member 131, the first detection member 131 can detect that the buffer member 120 is in the initial position and control the previous-stage extrusion mechanism 300 to work.

[0127] Referring to Figures 1 to 6 In an embodiment, the detection assembly 130 comprises a second detection member 132, which is located outside the buffer housing 110 and is arranged in correspondence with the buffer position of the buffer member 120, and is used to detect that the buffer member 120 is in the buffer position and control the previous-stage extrusion mechanism 300 to work.

[0128] The second detection member 132 is arranged on the support base 170 and is arranged in correspondence with the buffer position of the buffer rod 123. When the buffer member 120 is in the buffer position, the buffer rod 123 can touch the second detection member 132, and when the buffer member 120 moves from the initial position to the buffer position, the buffer rod 123 can also touch the first detection member 131. After the buffer rod 123 touches the second detection member 132, the second detection member 132 can detect that the buffer member 120 is in the buffer position and control the previous-stage extrusion mechanism 300 to stop.

[0129] Optionally, the buffer rod 123 triggers the first detection member 131 or the second detection member 132 through the first connecting head 124. Of course, the buffer rod 123 can also trigger the first detection member 131 or the second detection member 132 through its own triggering protrusion. Optionally, the first detection member 131 and the second detection member 132 are both Hall switches, micro switches, photoelectric switches or other components capable of detecting that the buffer component 120 is in the initial position or the buffer position.

[0130] Referring to Figures 1 to 6 In an embodiment, the first detection member 131 and the second detection member 132 have a preset distance along the pushing direction of the solid wire 200. That is, there is a certain distance between the initial position and the buffer position of the buffer component 120. In this way, when the buffer component 120 moves relative to the buffer housing 110, the buffer component 120 moves a distance before triggering the first detection member 131 or the second detection member 132, avoiding the buffer component 120 triggering the initial position and the buffer position at the same time, or mistakenly triggering the initial position or the buffer position, ensuring the reliability of the buffer mechanism 100.

[0131] The buffer mechanism 100 of the present application, the solid wire 200 enters the second feeding pipe 180 under the action of the upper-stage extrusion mechanism 300, and enters the conveying passage 121 of the buffer component 120 through the support member 160 and the second connecting head 162, and then enters the buffer mechanism 100 through the first connecting head 124 and the first feeding pipe 150. By switching the buffer component 120 between the initial position and the buffer position, the feeding speed of the upper-stage extrusion mechanism 300 and the lower-stage extrusion mechanism 400 is adapted.

[0132] When the buffer mechanism 100 starts to move, the buffer component 120 is in the initial position, and the buffer rod 123 triggers the first detection member 131 through the second connecting head 162, and the upper-stage extrusion mechanism 300 works. The upper-stage extrusion mechanism 300 pushes the solid wire 200 to the second feeding pipe 180, and then enters the lower-stage extrusion mechanism 400 through the second connecting head 162, the conveying passage 121, the first connecting head 124 and the first feeding pipe 150. The buffer component 120 and the buffer housing 110 form a sealed buffer cavity 101, and the buffer cavity 101 contains buffer gas.

[0133] If the feeding speed of the upper extrusion mechanism 300 is the same as the feeding speed of the lower extrusion mechanism 400, the upper extrusion mechanism 300 does not generate a pushing force on the buffer component 120 through the solid wire 200, and the buffer component 120 does not move relative to the buffer housing 110. In this case, the buffer component 120 remains in the initial position. Even if the solid wire 200 has a certain relative movement during the pushing process, the force generated by the relative movement is smaller than the pressure of the buffer gas on the buffer component 120. In this case, the buffer mechanism 100 can buffer the solid wire 200.

[0134] If the feeding speed of the upper extrusion mechanism 300 is greater than the feeding speed of the lower extrusion mechanism 400, the solid wire 200 pushed by the upper extrusion mechanism 300 is stored in the buffer mechanism 100, and the solid wire 200 generates a pushing force on the buffer component 120 after entering the conveying channel 121. The solid wire 200 can push the buffer component 120 to compress the buffer gas to the right (toward the second detection piece 132), and the second connecting head 162 moves to the right, making the length of the buffer mechanism 100 relative to the initial position longer, thereby buffering the consumables.

[0135] When the second connecting head 162 triggers the second detection piece 132, the buffer component 120 is in the buffer position, and the second detection piece 132 controls the upper extrusion mechanism 300 to stop working. In this case, only the lower extrusion mechanism 400 works and pushes the solid wire 200 into the melting nozzle, thereby buffering the solid wire 200. Moreover, only when the lower extrusion mechanism 400 works, the part of the solid wire 200 in the buffer mechanism 100 becomes shorter, and the pushing force of the solid wire 200 on the buffer component 120 is smaller than the pressure of the buffer gas on the buffer component 120, so that the buffer component 120 can move away from the second detection piece 132, making the length of the buffer mechanism 100 relative to the buffer position shorter.

[0136] When the buffer component 120 moves away from the second detection piece 132 to the initial position, the buffer component 120 triggers the first detection piece 131 through the first connecting head 124, and the first detection piece 131 controls the upper extrusion mechanism 300 to work, and the upper extrusion mechanism 300 continues to push the solid wire 200. This cycle continues to work, and the cooperation of the upper extrusion mechanism 300, the lower extrusion mechanism 400, and the buffer mechanism 100 realizes the buffering of the solid wire 200.

[0137] The buffer mechanism 100 of the present application, when the feeding speed of the upper-stage extrusion mechanism 300 is greater than the feeding speed of the lower-stage extrusion mechanism 400, the detection assembly 130 can control the upper-stage extrusion mechanism 300 to stop, and the lower-stage extrusion mechanism 400 pushes the solid wire 200, so as to avoid the accumulation of the solid wire 200 between the upper-stage extrusion mechanism 300 and the lower-stage extrusion mechanism 400, realize the continuous conveying of the solid wire 200, avoid the damage to the solid wire 200, and ensure the printing quality.

[0138] The present application also provides a 3D printer, which comprises at least two-stage extrusion mechanisms, a melting nozzle, and the buffer mechanism 100 of any one of the above embodiments. The at least two-stage extrusion mechanisms at least comprise the upper-stage extrusion mechanism 300 and the lower-stage extrusion mechanism 400, and the upper-stage extrusion mechanism 300 and the lower-stage extrusion mechanism 400 are arranged in the conveying direction of the solid wire 200.

[0139] The buffer mechanism 100 is arranged between the upper-stage extrusion mechanism 300 and the lower-stage extrusion mechanism 400. The lower-stage extrusion mechanism 400 is used to push the solid wire 200 to the melting nozzle. It is worth mentioning that the upper-stage extrusion mechanism 300 and the lower-stage extrusion mechanism 400 can adopt the existing extrusion mechanism, which will not be described here.

[0140] The 3D printer of the present application adopts the buffer mechanism 100 of the above embodiments, realizes the buffering of the solid wire 200, and when the feeding speed of the upper-stage extrusion mechanism 300 is greater than the feeding speed of the lower-stage extrusion mechanism 400, the detection assembly 130 can control the upper-stage extrusion mechanism 300 to stop, avoid the accumulation of the solid wire 200, realize the continuous conveying of the solid wire 200, avoid the damage to the solid wire 200, and ensure the printing quality.

[0141] The technical features of the above embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0142] The above embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it should not be understood as the limitation of the patent application scope. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A cushioning mechanism characterized by, A buffer mechanism is arranged between at least two extrusion mechanisms of a 3D printer, the buffer mechanism comprising: a buffer housing; a buffer component movably arranged in the buffer housing, the buffer component having a conveying passage through the buffer component along a moving direction of the buffer component, the buffer component having an initial position and a buffer position for buffering a solid wire, the buffer component being movable between the initial position and the buffer position; and a detection assembly arranged corresponding to the buffer component, the detection assembly being used for detecting the buffer position of the buffer component.

2. The cushioning mechanism of claim 1, wherein, The detection assembly further comprises a first detection member located outside the buffer housing and corresponding to the initial position of the buffer component, the first detection member being used for detecting the initial position of the buffer component. The detection assembly further comprises a second detection member located outside the buffer housing and corresponding to the buffer position of the buffer component, the second detection member being used for detecting the buffer position of the buffer component.

3. The cushioning mechanism of claim 1, wherein, The buffer component comprises a buffer body having the conveying passage and a buffer rod, the buffer body being movably arranged in the buffer housing, and an outer wall of the buffer body being fitted to an inner wall of the buffer housing. The buffer rod has a longitudinal cross-sectional dimension smaller than a longitudinal cross-sectional dimension of the buffer body, one end of the buffer rod being arranged in the buffer body, and the other end of the buffer rod being movably arranged through the buffer housing.

4. The cushioning mechanism of claim 3, wherein, The buffer body is sealingly arranged in the buffer housing, the buffer component and the buffer housing surrounding a buffer cavity, the buffer cavity being sealingly arranged and storing a buffer gas. The buffer gas in the buffer cavity is capable of keeping the buffer component in the initial position.

5. The cushioning mechanism of claim 4, wherein, The buffer mechanism further comprises a sealing member arranged between the buffer body and the buffer housing, and / or a sealing member arranged between the buffer rod and the buffer housing.

6. The cushioning mechanism of claim 3, wherein, The buffer component further comprises an elastic member arranged between the buffer component and the buffer housing. The elastic member provides an elastic force to keep the buffer component in the initial position.

7. A cushioning mechanism according to any one of claims 3 to 6, wherein, The buffer mechanism comprises at least one of the following features: In a first feature, an actuating portion is arranged at an end of the buffer rod away from the buffer body, the actuating portion being used for actuating the detection assembly. In a second feature, the buffer mechanism further comprises a first feeding tube arranged in the conveying passage and used for outputting the solid wire. In a third feature, the buffer component further comprises a first connecting head arranged at an end of the buffer rod away from the buffer body, the first connecting head being used for connecting the first feeding tube of the buffer mechanism, and the first connecting head being capable of actuating the detection assembly.

8. The cushioning mechanism of any one of claims 1 to 6, wherein, The buffer mechanism further comprises a support member located at an end of the buffer housing away from the conveying passage. The support member has a mounting hole arranged through along the moving direction of the buffer component, the mounting hole being coaxially arranged with the conveying passage and being in communication with the conveying passage, and the mounting hole being used for inputting the solid wire into the conveying passage.

9. The cushioning mechanism of claim 8, wherein, The buffering mechanism comprises at least one of the following features: Firstly, the support is arranged in the buffering housing, or the buffering housing and the support are arranged separately with a preset interval; Secondly, the buffering mechanism further comprises a support base, the buffering housing is fixed on the support base, and when the support is arranged separately from the buffering housing, the support is arranged on the support base; Thirdly, the buffering mechanism further comprises a second feeding pipe, the second feeding pipe is arranged on the support, and the second feeding pipe is communicated with the conveying channel and used for conveying the solid wire; Fourthly, the support further has a second connecting head, the second connecting head is arranged in the mounting hole, and the second connecting head has an inlet channel communicated with the conveying channel.

10. A 3D printer characterized by, The buffering mechanism comprises at least two-stage extrusion mechanism, a melting nozzle and any one of the buffering mechanisms according to claims 1 to 9; The at least two-stage extrusion mechanism comprises an upper-stage extrusion mechanism and a lower-stage extrusion mechanism, the upper-stage extrusion mechanism and the lower-stage extrusion mechanism are arranged separately along the conveying direction of the solid wire, and the buffering mechanism is arranged between the upper-stage extrusion mechanism and the lower-stage extrusion mechanism; The lower-stage extrusion mechanism is used for pushing the solid wire to the melting nozzle.

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