Extrusion apparatus and 3D printing device

Abstract

The present invention relates to an extrusion apparatus and a 3D printing device. The extrusion apparatus comprises an extrusion assembly, a driving assembly, and a switching mechanism. The switching mechanism comprises a positioning assembly and a toggling member rotatably connected to the positioning assembly. A first extrusion wheel is installed on the positioning assembly. A second extrusion wheel is installed on the toggling member. The toggling member has an opening position and a closing position. When the toggling member is moved to the opening position, the second extrusion wheel is far away from the first extrusion wheel, and a feeding gap between the second extrusion wheel and the first extrusion wheel is increased, so that replacement or feeding of consumables is achieved. When the toggling member is operated to move to the closing position, the second extrusion wheel is close to the first extrusion wheel, and the feeding gap between the second extrusion wheel and the first extrusion wheel is decreased, so that extrusion and conveying of the consumables is achieved, and the replacement of the consumables is more convenient and efficient. A spring does not need to be provided to press extrusion wheels, so that the problem that extrusion force between the two extrusion wheels is changed due to spring deformation can be avoided, the extrusion force provided by the two extrusion wheels is stable and reliable, and the feeding reliability of the extrusion apparatus is improved.

Description

Extrusion device and 3D printing equipment Technical Field

[0001] The present invention relates to the technical field of 3D printing, and in particular to an extrusion device and a 3D printing device. Background Art

[0002] In 3D printing equipment, the extruder is usually used to extrude filaments.

[0003] In related art, the extrusion device includes a spring and two extrusion wheels. The spring uses its own elastic force to compress one of the extrusion wheels, causing the two extrusion wheels to engage and extrude material. When loading or changing materials, the operator must overcome the spring's compressive force and move one of the extrusion wheels away from the other, increasing the distance between the two extrusion wheels' axial centers, thereby allowing the loading or changing operation.

[0004] Since the spring is easily deformed when compressed for a long time, the stability of the extrusion force between the two extrusion wheels is affected, and thus there is a problem of low reliability in use.

[0005] Summary of the Invention

[0006] Based on this, it is necessary to provide an extrusion device that solves the problem of low reliability in use of traditional extrusion devices.

[0007] An extrusion device for conveying 3D printing consumables, comprising:

[0008] An extrusion assembly includes a first extrusion wheel and a second extrusion wheel, wherein a feeding gap for the consumable material to pass through is formed between the first extrusion wheel and the second extrusion wheel;

[0009] A driving assembly, in transmission connection with the extrusion assembly, for driving the first extrusion wheel and the second extrusion wheel to rotate in opposite directions;

[0010] The switching mechanism includes a positioning assembly and a toggle member rotatably connected to the positioning assembly; the first extrusion wheel is mounted on the positioning assembly, and the second extrusion wheel is mounted on the toggle member; the toggle member has an open position and a closed position;

[0011] The toggle member is configured to be operably rotated to switch between the open position and the closed position, driving the second extrusion wheel to approach or move away from the first extrusion wheel to reduce or increase the feeding gap.

[0012] In one embodiment, the toggle member is configured with a first limiting portion, and the positioning assembly is configured with a first connecting member, and the first connecting member is configured in the first limiting portion;

[0013] During the rotation of the toggle member relative to the positioning assembly, the first connecting member moves within the first limiting portion.

[0014] In one embodiment, the first extrusion wheel is mounted on the first connecting member, and the second extrusion wheel is mounted on the mounting shaft of the toggle member;

[0015] When the toggle member is in the closed position, the mounting axis and the first connecting member are collinear in a horizontal direction.

[0016] In one embodiment, one of the positioning assembly and the toggle member is configured with a second limiting portion, and the other is configured with a second connecting member, and the second connecting member is configured in the second limiting portion;

[0017] During the rotation of the toggle member relative to the positioning assembly, the second connecting member moves within the second limiting portion.

[0018] In one embodiment, the first limiting portion is a first sliding groove, the second limiting portion is a second sliding groove, and an extension direction of the first sliding groove is arranged at an angle to an extension direction of the second sliding groove.

[0019] In one embodiment, the first sliding groove and the second sliding groove are located at two ends of the toggle member, and the first sliding groove and the second sliding groove are not collinear in the horizontal direction and the vertical direction.

[0020] In one embodiment, the positioning assembly is configured with a first locking portion, and the toggle member is configured with two spaced-apart second locking portions;

[0021] When the toggle member is rotated to the open position, the first locking portion engages with one of the second locking portions;

[0022] When the toggle member rotates to the closed position, the first locking portion is engaged with the other second locking portion.

[0023] In one embodiment, one of the first locking portion and the second locking portion is a ball-shaped positioning pin, and the other is a first positioning hole, and the ball-shaped positioning pin is snap-fitted with the first positioning hole.

[0024] In one embodiment, the positioning assembly includes a fixing seat and a positioning plate arranged on the fixing seat; the toggle member is located between the positioning plate and the fixing seat and is rotatably connected to the positioning plate; the first locking portion is arranged on the fixing seat.

[0025] In one embodiment, the first extrusion wheel and the second extrusion wheel each include a first main body wheel and a second main body wheel coaxially connected; the two first main body wheels are engaged for transmission, and one of the first main body wheels is connected to the driving assembly;

[0026] The feeding gap is formed between the two second main body wheels, and the second main body wheels are driven to rotate by the first main body wheels on the corresponding sides.

[0027] In one embodiment, the driving assembly includes a driving member and a driving gear connected to the driving member, and the driving member is used to drive the driving gear to rotate;

[0028] The extrusion device also includes a transmission wheel, which includes a third main wheel and a fourth main wheel coaxially connected; the third main wheel is engaged with the drive gear for transmission, and the number of teeth of the third main wheel is greater than the number of teeth of the drive gear; the fourth main wheel is engaged with the first main wheel for transmission.

[0029] A 3D printing device comprises the extrusion device described above.

[0030] This technical solution has the following beneficial effects: The extrusion device comprises an extrusion assembly, a drive assembly, and a switching mechanism. The extrusion assembly includes a first extrusion wheel and a second extrusion wheel. The switching mechanism includes a positioning assembly and a toggle rotatably connected to the positioning assembly. The first extrusion wheel is mounted on the positioning assembly, and the second extrusion wheel is mounted on the toggle. By rotating the toggle, the second extrusion wheel mounted on the toggle moves closer to or further away from the first extrusion wheel, thereby changing the feed gap between the first and second extrusion wheels. When the toggle is moved to the open position, the second extrusion wheel moves away from the first extrusion wheel, increasing the feed gap between the two extrusion wheels and facilitating consumable material replacement or loading. When the toggle is moved to the closed position, the second extrusion wheel moves closer to the first extrusion wheel, decreasing the feed gap between the two extrusion wheels and enabling extrusion and feeding of consumable materials, making consumable material replacement more convenient and efficient. No spring is required to compress the extrusion wheels, thus avoiding the problem of spring deformation causing changes in the extrusion force between the two extrusion wheels. This ensures a more stable and reliable extrusion force provided by the two extrusion wheels, reduces the risk of material shaving and breakage, and improves the feeding reliability and operational stability of the extrusion device. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 is a schematic structural diagram of an extrusion device provided in one embodiment of the present invention;

[0032] FIG2 is a schematic diagram of the extrusion device shown in FIG1 with the cover hidden;

[0033] FIG3 is an exploded view of the extrusion device shown in FIG1 ;

[0034] FIG4 is a schematic diagram of the extrusion device shown in FIG1 in a closed position;

[0035] FIG5 is a top view of the extrusion device shown in FIG4 in a closed position;

[0036] FIG6 is a schematic diagram of the extrusion device shown in FIG4 in an open position;

[0037] FIG7 is a top view of the extrusion device shown in FIG6 in an open position;

[0038] FIG8 is a partial schematic diagram of the extrusion device shown in FIG2 ;

[0039] FIG9 is a half-sectional view of the extrusion device shown in FIG2 ;

[0040] FIG10 is a cross-sectional view of the extrusion device shown in FIG1 .

[0041] Reference numerals: 10 - extrusion device; 100 - extrusion assembly; 110 - first extrusion wheel; 120 - second extrusion wheel; 121 - first main body wheel; 122 - second main body wheel; 130 - feeding gap;

[0042] 200-driving assembly; 210-driving member; 220-driving gear;

[0043] 300 - positioning assembly; 310 - positioning plate; 311 - second connecting member; 312 - first connecting member; 313 - rotating shaft; 320 - fixing seat; 321 - first locking portion; 3211 - ball positioning pin; 322 - avoidance groove; 323 - limiting column; 330 - second avoidance gap;

[0044] 400 - toggle member; 410 - second limiting portion; 411 - second sliding groove; 420 - second locking portion; 421 - first positioning hole; 430 - first limiting portion; 431 - first sliding groove; 450 - mounting shaft; 460 - handle; 470 - first avoidance gap;

[0045] 500-transmission wheel; 510-third main wheel; 520-fourth main wheel;

[0046] 610-claw; 620-buckle; 630-cover; 631-guide hole;

[0047] 700-Bearings. DETAILED DESCRIPTION

[0048] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0049] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0051] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0052] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0053] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0054] As shown in Figures 1 to 6, an embodiment of the present invention provides an extrusion device 10 for conveying 3D printing consumables, including an extrusion assembly 100, a drive assembly 200, and a switching mechanism. The extrusion assembly 100 includes a first extrusion wheel 110 and a second extrusion wheel 120, with a feeding gap 130 formed between the first extrusion wheel 110 and the second extrusion wheel 120 for passing consumables (not shown). The drive assembly 200 is transmission-connected to the extrusion assembly 100, and the drive assembly 200 is used to drive the first extrusion wheel 110 and the second extrusion wheel 120 to rotate in opposite directions. The switching mechanism includes a positioning assembly 300 and a toggle 400 rotatably connected to the positioning assembly 300; the first extrusion wheel 110 is mounted on the positioning assembly 300, and the second extrusion wheel 120 is mounted on the toggle 400; the toggle 400 has an open position and a closed position. The toggle member 400 is configured to be operably rotated to switch between an open position and a closed position, driving the second extrusion wheel 120 to move closer to or away from the first extrusion wheel 110 to reduce or increase the feeding gap 130 .

[0055] Among them, the two extrusion wheels are radially recessed to form extrusion grooves, and the two extrusion grooves form the above-mentioned feeding gap 130, and the consumables are clamped between the first extrusion wheel 110 and the second extrusion wheel 120. When the consumables need to be replaced, the operating toggle member 400 is moved to the open position, so that the second extrusion wheel 120 is moved away from the first extrusion wheel 110, the feeding gap 130 between the two extrusion wheels is increased, and the two extrusion grooves are separated from the extrusion of the consumables, thereby realizing the replacement or loading of the consumables. When the operating toggle member 400 is moved to the closed position, the second extrusion wheel 120 is moved closer to the first extrusion wheel 110, and the feeding gap 130 between the two is reduced, thereby realizing the extrusion and transportation of the consumables, and the replacement of consumables is more convenient and efficient. There is no need to set a spring to compress the extrusion wheel, so the problem of the extrusion force between the two extrusion wheels changing due to spring deformation can be avoided, so that the extrusion force provided by the two extrusion wheels is more stable and reliable, reducing the risk of planing and breaking, and improving the feeding reliability and use stability of the extrusion device 10. It can be understood that the first extrusion wheel 110 and the second extrusion wheel 120 can be gears or rubber wheels, the toggle member can be a toggle plate, and the positioning assembly can be a positioning plate.

[0056] As shown in Figures 4, 6, and 8, in one embodiment, the toggle member 400 is configured with a first stopper 430, and the positioning assembly 300 is configured with a first connecting member 312. The first connecting member 312 is disposed within the first stopper 430. During the rotation of the toggle member 400 relative to the positioning assembly 300, the first connecting member 312 moves within the first stopper 430.

[0057] Specifically, the first connecting member 312 is provided on the positioning assembly 300, and the first limiting portion 430 is provided on the toggle member 400. By arranging the first connecting member 312 to move within the first limiting portion 430 to accommodate the rotation of the toggle member 400, the toggle member 400 has a certain amount of movable space, allowing it to rotate to a certain extent, thereby being able to switch between the open position and the closed position.

[0058] Of course, the first connection member and the first limiting portion can be interchanged, that is, the first connection member is arranged on the toggle member, and the first limiting portion is arranged on the positioning assembly. During the rotation of the toggle member, the first connection member moves within the first limiting portion.

[0059] As shown in Figures 2 to 4, in one embodiment, the first connecting member 312 is provided on the positioning assembly 300, and the first stop portion 430 is provided on the toggle member 400. The first extrusion wheel 110 is mounted on the first connecting member 312, and the second extrusion wheel 120 is mounted on the mounting shaft 450 on the toggle member 400. When the toggle member 400 is in the closed position, the mounting shaft 450 and the first connecting member 312 are collinear along the horizontal direction, i.e., the X direction in the figure. It can be understood that the horizontal direction is perpendicular to the axial direction of the two extrusion wheels.

[0060] As shown in Figure 4, when the consumable material is clamped between the two extrusion wheels, it applies a first force acting horizontally to the right on the second extrusion wheel 120. This first force is transmitted to the mounting shaft 450, i.e., the toggle member 400, through the second extrusion wheel 120. Simultaneously, the consumable material applies a second force of equal magnitude and opposite direction to the first extrusion wheel 110. This second force acts on the first stopper 430, i.e., the toggle member 400, via the second connecting member 312 to which the first extrusion wheel 110 is mounted. Because the mounting shaft 450 and the first connecting member 312 are collinear in the X-direction, the first and second forces acting on the toggle member 400 are in opposite directions and can cancel each other out. This results in a net force of zero on the toggle member 400 due to the consumable material, thus preventing the second extrusion wheel 120 from being stretched apart by the consumable material, thereby increasing the interaxial distance between the first and second extrusion wheels 110, 120.

[0061] As shown in Figures 4 to 6, in one embodiment, one of the positioning assembly 300 and the toggle member 400 is constructed with a second limiting portion 410, and the other is constructed with a second connecting member 311, and the second connecting member 311 is configured in the second limiting portion 410; during the rotation of the toggle member 400 relative to the positioning assembly 300, the second connecting member 311 moves in the second limiting portion 410.

[0062] Specifically, as shown in Figures 3 and 4, the second connecting member 311 is disposed on the positioning assembly 300, and the second limiting portion 410 is disposed on the toggle member 400. A rotation axis 313 is disposed on the positioning assembly 300, and the toggle member 400 rotates around the rotation axis 313. During the rotation of the toggle member 400, its motion trajectory is a circular arc trajectory. By arranging the second connecting member 311 to move within the second limiting portion 410 to accommodate the rotation of the toggle member 400, the toggle member 400 has a certain amount of movement space, allowing it to rotate to a certain extent, thereby being able to switch between the open position and the closed position.

[0063] As shown in Figures 3 and 4, in another embodiment, the first connecting member 312 is a first pin, and the first limiting portion 430 is a first slide groove 431. The second connecting member 311 is a second pin, and the second limiting portion 410 is a second slide groove 411. The extension direction of the first slide groove 431 and the extension direction of the second slide groove 411 are arranged at an angle.

[0064] Specifically, the first chute extends in an angle with the horizontal direction (i.e., the X-direction). For example, the first limiter 430 extends in a vertical direction perpendicular to the horizontal direction. The second chute extends in the horizontal direction (i.e., the X-direction) as shown in the figure. The width of the first chute is slightly larger than the diameter of the first pin, and the width of the second chute is slightly larger than the diameter of the second pin, ensuring that the first and second pins have sufficient space for movement.

[0065] During the rotation of the toggle member 400 about the rotation axis 313, its displacement can be decomposed into a horizontal displacement component and a vertical displacement component. The second connecting member 311 moves within the horizontally extending second chute 411, thereby accommodating the horizontal displacement component of the toggle member 400. The first connecting member 312 moves within the first chute 431, thereby accommodating the vertical displacement component of the toggle member 400, ensuring that the rotation of the toggle member 400 is unrestricted. It is understandable that when both the second chute 411 and the first chute 431 are provided on the toggle member 400, the groove width of the chute can match the shaft diameter of the corresponding connecting member. When the second chute or the first chute is provided separately, the groove width of the chute should be greater than the shaft diameter of the connecting member to ensure that it can generate displacement components in both the horizontal and vertical directions.

[0066] In other embodiments, the second limiting portion may also be a circular hole, and when the toggle member rotates, the circular hole is used to allow the second connecting member to move.

[0067] It is understandable that the second connection member and the second limit portion can be interchanged, that is, the second connection member is arranged on the toggle member, and the second limit portion is arranged on the positioning assembly. During the rotation of the toggle member, the second connection member moves within the second limit portion.

[0068] As shown in FIG3 and FIG4 , in one embodiment, the first sliding groove 431 and the second sliding groove 411 are located at two ends of the toggle member 400 , and the first sliding groove 431 and the second sliding groove 411 are not collinear in the horizontal direction and the vertical direction.

[0069] This arrangement allows for a greater spacing between the first chute 431 and the second chute 411, i.e., a more even distribution of the two. This reduces the possibility of the two chute being positioned too close together, which could restrict the rotation of the toggle member 400 and improves the smoothness of the rotation of the toggle member 400. Specifically, taking the toggle member 400 as a rectangular plate, the second chute 411 and the first chute 431 are located approximately at diagonal positions of the rectangular plate. If the toggle member 400 is a circular plate, the second chute 411 and the first chute 431 can be located at radially opposite ends of the circular plate.

[0070] As shown in Figures 8 to 10, in one embodiment, the positioning assembly 300 is configured with a first locking portion 321, and the toggle member 400 is configured with two spaced-apart second locking portions 420, with the two second locking portions 420 corresponding to the open position and the closed position, respectively. As shown in Figure 6, when the toggle member 400 is rotated to the open position, the first locking portion 321 engages with one of the second locking portions 420. As shown in Figure 4, when the toggle member 400 is rotated to the closed position, the first locking portion 321 engages with the other second locking portion 420.

[0071] When the toggle 400 moves to the open position or the closed position, the first locking portion 321 and the second locking portion 420 cooperate to lock the toggle 400 in the current position, reducing the possibility of the two extrusion wheels being affected by the extrusion force of the consumables, resulting in a change in the distance between the axes, ensuring the reliability of the toggle 400 in the current position, and thus ensuring the stability of the material changing operation or feeding operation. In addition, after the toggle 400 is moved into place, the first locking portion 321 and the second locking portion 420 engage and cooperate, so that the operator only needs to operate the toggle 400 during the position switching process, without having to manually act on the toggle 400 until the material changing is completed. The operator can easily switch between the open position and the closed position with a single hand, thereby improving the user's operating experience.

[0072] The two second locking portions 420 can be positioned near the operating position of the toggle 400, so that when the operator rotates the toggle 400, the positions of the two second locking portions 420 change synchronously. It is understandable that since the rotation trajectory of the toggle 400 is an arc, the distribution positions of the two second locking portions 420 should also be located on a circular trajectory. The position of the first locking portion 321 corresponds to the position of the second locking portion 420, allowing the two to achieve a snap-fit ​​fit.

[0073] As shown in Figures 8 to 10, in an optional embodiment, one of the first locking portion 321 and the second locking portion 420 is a ball-shaped positioning pin 3211, and the other is a first positioning hole 421, and the ball-shaped positioning pin 3211 is snap-fitted with the first positioning hole 421.

[0074] Specifically, in this embodiment, the first locking portion 321 is a ball-shaped positioning pin 3211, which is provided on the positioning assembly 300. The second locking portion 420 is a first positioning hole 421, which is provided on the toggle member 400. Accordingly, there are two first positioning holes 421, one corresponding to the open position and the other to allow the ball-shaped positioning pin 3211 to extend into, thereby locking the toggle member 400 in position, ensuring the reliability of the toggle member 400 in its current position, and thus ensuring the stability of the material changing or feeding operation.

[0075] It can be understood that in other embodiments, the first locking part can be a first positioning hole, and the second locking part can be a ball-shaped positioning pin. Correspondingly, the number of the ball-shaped positioning pins is two, so that when it is rotated to different positions, the ball-shaped positioning pins at the corresponding positions can be engaged with the first positioning hole.

[0076] In another embodiment, one of the first locking portion and the second locking portion is a hook, and the other has a slot for the hook to pass through. For example, the first locking portion is a slot provided on the positioning assembly. The second locking portion is a hook, and there are two hooks provided on the toggle member. When the toggle member is rotated to the open or closed position, the operator manipulates the hook to pass through the slot. Since the positioning assembly is fixed in position, the toggle member is locked in position through the cooperation of the hook and the slot.

[0077] As shown in Figures 2 and 3, in one embodiment, the first extrusion wheel 110 and the second extrusion wheel 120 each include a first main wheel 121 and a second main wheel 122 coaxially connected. The two first main wheels 121 are meshed and driven, and one of the first main wheels 121 is connected to the drive assembly 200. A feeding gap 130 is formed between the two second main wheels 122, and the second main wheels 122 are driven to rotate by the first main wheel 121 on the corresponding side.

[0078] The two first main wheels 121 may be gears that mesh with each other. The two second main wheels 122 may also be gears, so that the first extrusion wheel 110 and the second extrusion wheel 120 are double gears. This arrangement enables the two extrusion wheels to rotate synchronously in opposite directions, ensuring a greater extrusion force; it also allows a certain gap to be maintained between the two extrusion wheels, thereby achieving the conveyance of consumables. In other embodiments, the two second main wheels may be rubber wheels, and the friction between the two rubber wheels and the consumables is used to achieve the conveyance of consumables.

[0079] In one embodiment, the drive assembly 200 includes a drive member 210 and a drive gear 220 connected to the drive member 210, and the drive member 210 is used to drive the drive gear 220 to rotate. The extrusion device 10 also includes a transmission wheel 500, which includes a third main wheel 510 and a fourth main wheel 520 coaxially connected. The third main wheel 510 is meshed with the drive gear 220 for transmission, and the number of teeth on the third main wheel 510 is greater than the number of teeth on the drive gear 220. The fourth main wheel 520 is meshed with the first main wheel 121 for transmission.

[0080] In other words, the drive gear 220 is a small gear, and the third main wheel 510 is a large gear. A two-stage reduction structure is formed between the drive gear 220 and the third main wheel 510, thereby increasing the extrusion force of the two extrusion wheels, improving the conveying capacity of consumables, and ensuring the reliability of feeding. Among them, the drive member 210 uses a small stepper motor, which not only reduces the weight of the drive member 210, but also reduces the space occupied by the drive member 210, making the entire extrusion device 10 lighter and the layout more reliable.

[0081] As shown in Figure 3, the ends of the two extrusion wheels are also sleeved with bearings 700, and the end of the transmission wheel 500 is also sleeved with a bearing 700. By providing the bearings 700 to support the corresponding moving parts, the axis position of the moving parts is fixed, reducing the noise generated by sliding friction during the rotation of the moving parts.

[0082] As shown in Figures 2, 6, and 8, in one embodiment, a first relief notch 470 is provided on the toggle member 400, making the toggle member 400 approximately C-shaped. The provision of the first relief notch 470 creates a relief space for the drive gear 220 and the transmission wheel 500 to pass through, making the overall layout of the device more compact and reasonable.

[0083] As shown in Figures 3 and 8 , the positioning assembly 300 is a rectangular plate with a second relief notch 330 provided thereon, giving the toggle member a roughly C-shaped form. The coordination of the first relief notch 470 and the second relief notch 330 allows the drive gear 220 and the transmission wheel 500 to be positioned within the space formed by the two relief notches, making the overall layout of the device more compact and reasonable.

[0084] In other embodiments, the toggle member may be a U-shaped plate, with the second slide groove disposed at the bottom of the U-shaped plate; the first connector and the second locking portion are disposed on the two side walls of the U-shaped plate, respectively. The positioning assembly may be an L-shaped plate comprising a horizontal section and a vertical section, with the second connector disposed on the vertical section for rotationally engaging with the second slide groove; and the first connector disposed on the horizontal section for rotationally engaging with the first slide groove.

[0085] In other embodiments, when a deceleration structure is not required, the driving member may directly engage with one of the first main body wheels, thereby transmitting power to the two extrusion wheels to achieve the transportation of consumables.

[0086] As shown in FIG2 , the toggle 400 is provided with a handle 460 having anti-slip grooves. When the operator grips the handle 460, the anti-slip grooves can increase the contact friction between the operator and the toggle 400, making it easier for the operator to rotate the toggle 400, preventing slipping and improving the smoothness of operating the toggle 400.

[0087] As shown in Figures 2, 3, and 9, in one embodiment, the positioning assembly 300 includes a fixing base 320 and a positioning plate 310 disposed on the fixing base 320. The toggle member 400 is located between the positioning plate 310 and the fixing base 320 and is rotatably connected to the positioning plate 310; the first locking portion 321 is disposed on the fixing base 320.

[0088] Among them, the fixing seat 320 and the positioning plate 310 can be connected by fasteners such as pins or bolts. A connecting shaft is provided on the positioning plate 310, one end of which passes through the fixing seat 320 and is used to install the first extrusion wheel 110. A second connecting member 311 is provided on the positioning plate 310, and the second connecting member 311 passes through the toggle member 400, thereby realizing the rotational connection between the toggle member 400 and the positioning assembly 300. The first locking portion 321 is provided on the fixing seat 320, so as to lock and limit the toggle member 400 in the open position or the closed position. By arranging the second connecting member 311 and the first locking portion 321 on two components respectively, the reliability in the rotation and locking process is improved, and independent control is facilitated.

[0089] As shown in Figures 8 and 9, in one embodiment, a relief groove 322 is constructed on the fixed seat 320, and at least a portion of the toggle member 400 is located in the relief groove 322 and is able to rotate within the space formed by the relief groove 322. When the toggle member 400 is in the open position, the toggle member 400 abuts against the groove wall of the relief groove 322. In other words, by providing the relief groove 322, on the one hand, the space occupied by the fixed seat 320 and the toggle member 400 as a whole in the axial direction can be reduced. On the other hand, the relief groove 322 can limit the movable space of the toggle member 400, so that the toggle member 400 can only move within a preset range, thereby ensuring the reliability of the toggle member 400 switching between the open position and the closed position.

[0090] Furthermore, the fixing seat 320 is provided with a limiting post 323, which protrudes outwardly from the wall of the avoidance groove 322. When the toggle member 400 rotates until it abuts the wall of the limiting groove, the toggle member 400 also abuts the limiting post 323. Since the limiting post 323 protrudes from the wall of the avoidance groove 322, the risk of the toggle member 400 sliding out of the avoidance groove 322 is reduced, thereby improving the limiting effect on the toggle member 400, keeping it in the open position, and thus ensuring the reliability of its switching to the closed position.

[0091] As shown in Figures 1 and 2, in one embodiment, the extrusion device 10 further includes a cover 630, which is connected to the side of the fixing base 320 facing away from the toggle member 400. By providing the cover 630, the internal moving parts, such as the two extrusion wheels, can be effectively protected from the ingress of debris and dust, thereby ensuring the operational reliability of the moving parts.

[0092] As shown in Figures 1 and 3, in another embodiment, the extrusion device 10 further includes a mutually engaged claw 610 and a buckle 620. The cover 630 is provided with a through guide hole 631. One end of the claw 610 passes through the buckle 620 and extends into the guide hole 631. The claw 610 is provided with a through hole. The through hole and the guide hole 631 form a guide space for the consumables to pass through and guide the consumables, thereby improving the straightness of the consumables during transportation and reducing the risk of the consumables not being able to properly enter the print head due to poor straightness.

[0093] Furthermore, the present invention also provides a 3D printing device, including the above-mentioned extrusion device 10. Since the 3D printing device has the above-mentioned extrusion device 10, when the consumables need to be replaced, the operating toggle member 400 is moved to the open position, so that the second extrusion wheel 120 is moved away from the first extrusion wheel 110, the feeding gap 130 between the two is increased, and the two extrusion grooves are separated from the extrusion of the consumables, thereby realizing the replacement or loading of the consumables. When the operating toggle member 400 is moved to the closed position, the second extrusion wheel 120 is moved closer to the first extrusion wheel 110, and the feeding gap between the two is reduced, thereby realizing the extrusion and transportation of the consumables, and the replacement of consumables is more convenient and efficient. There is no need to set a spring to compress the extrusion wheel, so the problem of the extrusion force between the two extrusion wheels changing due to spring deformation can be avoided, so that the extrusion force provided by the two extrusion wheels is more stable and reliable, reducing the risk of planing and breaking, and improving the feeding reliability and use stability of the extrusion device 10.

[0094] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0095] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. An extrusion device for conveying 3D printing consumables, characterized in that, Comprising: An extrusion assembly, including a first extrusion wheel and a second extrusion wheel, with a feeding gap formed between the first extrusion wheel and the second extrusion wheel for the consumable to pass through; A driving assembly, drivingly connected to the extrusion assembly for driving the first extrusion wheel and the second extrusion wheel to rotate in opposite directions; A switching mechanism, including a positioning assembly and a toggling member rotatably connected to the positioning assembly; the first extrusion wheel is mounted on the positioning assembly, and the second extrusion wheel is mounted on the toggling member; the toggling member has an open position and a closed position; The toggling member is configured to be operably rotated to switch between the open position and the closed position, driving the second extrusion wheel closer to or farther from the first extrusion wheel to reduce or increase the feeding gap.

2. The extrusion device according to claim 1, characterized in that The toggling member is constructed with a first limiting portion, and the positioning assembly is constructed with a first connecting member, which is configured to be within the first limiting portion; During the rotation of the toggling member relative to the positioning assembly, the first connecting member moves within the first limiting portion.

3. The extrusion device according to claim 2, characterized in that, The first extrusion wheel is mounted on the first connecting member, and the second extrusion wheel is mounted on the mounting shaft of the toggling member; When the toggling member is in the closed position, the mounting shaft and the first connecting member are collinear in the horizontal direction.

4. The extrusion device according to claim 2, characterized in that One of the positioning assembly and the toggling member is constructed with a second limiting portion, and the other is constructed with a second connecting member, which is configured to be within the second limiting portion; During the rotation of the toggling member relative to the positioning assembly, the second connecting member moves within the second limiting portion.

5. The extrusion device according to claim 4, characterized in that, The first limiting portion is a first chute, and the second limiting portion is a second chute, and the extending direction of the first chute and the extending direction of the second chute are arranged at an angle.

6. The extrusion device according to claim 5, characterized in that The first chute and the second chute are located at both ends of the toggling member, and the first chute and the second chute are not collinear in both the horizontal direction and the vertical direction.

7. The extrusion device according to claim 1, characterized in that The positioning assembly is constructed with a first locking portion, and the toggling member is constructed with two spaced second locking portions; When the toggling member rotates to the open position, the first locking portion is engaged with one of the second locking portions; When the toggling member rotates to the closed position, the first locking portion is engaged with the other second locking portion.

8. The extrusion device according to claim 7, characterized in that One of the first locking portion and the second locking portion is a ball detent pin, and the other is a first positioning hole, and the ball detent pin is engaged with the first positioning hole.

9. The extrusion device according to claim 7, characterized in that, The positioning assembly includes a fixed seat and a positioning plate provided on the fixed seat; the toggling member is located between the positioning plate and the fixed seat and is rotatably connected to the positioning plate; the first locking portion is provided on the fixed seat.

10. The extrusion device according to claim 1, characterized in that, Both the first extrusion wheel and the second extrusion wheel include a first main wheel and a second main wheel coaxially connected; the two first main wheels are meshed and driven, and one of the first main wheels is connected to the driving assembly; The feeding gap is formed between the two second main wheels, and the second main wheel is driven to rotate by the corresponding first main wheel on the side.

11. The extrusion device according to claim 10, characterized in that, The driving assembly includes a driving member and a driving gear connected to the driving member, and the driving member is used to drive the driving gear to rotate; The extrusion device further includes a transmission wheel, and the transmission wheel includes a third main body wheel and a fourth main body wheel coaxially connected; the third main body wheel meshes and drives with the driving gear, and the number of teeth of the third main body wheel is greater than that of the driving gear; the fourth main body wheel meshes and drives with the first main body wheel.

12. A 3D printing device, characterized in that, An extrusion device according to any one of claims 1-11 is included.

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