Extrusion mechanism and 3D printing system

Abstract

The present invention relates to an extrusion mechanism, which includes a first extrusion wheel, a second extrusion wheel, an eccentric shaft and a first mounting member. The eccentric shaft includes a first shaft segment and a second shaft segment that are parallel to each other and eccentrically arranged in sequence in its length direction; the second extrusion wheel is sleeved and fixed on the second shaft segment; the first mounting member has a first guiding hole and a second guiding hole; at least part of the first shaft segment is arranged in the first guiding hole and moves along a first direction, and is restricted from moving in a second direction; at least part of the second shaft segment is arranged in the second guiding hole and moves along a second direction, and is restricted from moving in the first direction; when the eccentric shaft rotates relative to the first mounting member, the second extrusion wheel moves closer to or away from the first extrusion wheel along the second direction. Since during the adjustment process of the center distance between the two extrusion wheels, the plane where the center axis connection line of the two extrusion wheels is located is always unchanged from the feeding direction, after the adjustment is completed, the printing consumables are not likely to tilt and curl, and the extrusion effect is better.

Description

Technical Field

[0001] The present invention relates to the technical field of eccentric adjustment, and particularly to an extrusion mechanism and a 3D printing system. Background Art

[0002] With the development of 3D printing technology, the FDM (Fused Deposition Modelling) 3D printing technology has emerged. It is a fused deposition modeling technology that extrudes and melts solid printing consumables into a liquid at high temperature by an extruder, and finally forms a three-dimensional entity in three-dimensional space, with very wide applications. However, when the hardness of the printing consumables is different, it is necessary to adjust the center distance between the two extrusion wheels of the extruder so that the extruder can better extrude the printing consumables, thereby making the quality of the printed model higher.

[0003] In the prior art, in order to adjust the center distance between the two extrusion wheels, for example, in CN108454092, a swing rod is installed on one of the two extrusion wheels. Through the swinging action of the swing rod, the distance between the two extrusion wheels is adaptively adjusted according to the hardness of the printing consumables. However, this adjustment method will cause the movement trajectory of the extrusion wheel that can perform swinging motion to be an arc, and thus the angle of the plane where the center axis connection line of the two extrusion wheels is located with respect to the horizontal plane will change. Since the printing consumables always enter between the two extrusion wheels along the same feeding direction during the printing process, when the plane where the center axis connection line of the two extrusion wheels is located is no longer perpendicular to the feeding direction, the printing consumables will tilt and curl during the extrusion process, affecting the extrusion effect of the printing consumables and ultimately reducing the quality of the printed model. Summary of the Invention

[0004] Based on this, in view of the technical problem that in the existing 3D printing system, when adjusting the center distance between the two extrusion wheels, when the plane where the center axis connection line of the two extrusion wheels is located is no longer perpendicular to the feeding direction, the printing consumables are prone to tilt and curl during the extrusion process, it is necessary to provide an extrusion mechanism.

[0005] An extrusion mechanism, which comprises:

[0006] A first extrusion wheel;

[0007] A second extrusion wheel, which is oppositely arranged with the first extrusion wheel and cooperates with each other to perform an extrusion operation;

[0008] An eccentric shaft, which comprises a first shaft segment and a second shaft segment that are parallel to each other and are eccentrically arranged in sequence in the length direction of the eccentric shaft; the second extrusion wheel is sleeved and fixed on the second shaft segment;

[0009] The first mounting member, the first mounting member being configured with a first guiding hole and a second guiding hole; at least part of the first shaft section is disposed within the first guiding hole and is capable of moving in a first direction, and the first shaft section is restricted from moving in a second direction; wherein, the second direction is the direction in which the second extrusion wheel is oppositely disposed to the first extrusion wheel, and the first direction is disposed at an angle to the second direction; at least part of the second shaft section is disposed within the second guiding hole and is capable of moving in the second direction, and the second shaft section is restricted from moving in the first direction; when the eccentric shaft rotates relative to the mounting member, the second extrusion wheel moves closer to or away from the first extrusion wheel in the second direction.

[0010] In one embodiment, the first shaft section and the second shaft section are connected to each other, and the first guiding hole and the second guiding hole penetrate through in a first axis direction, wherein, the first axis is the axis of the first shaft section.

[0011] In one embodiment, the projections of the first guiding hole and the second guiding hole on a plane perpendicular to the first axis have an overlapping area.

[0012] In one embodiment, the diameter of the second shaft section is greater than the width of the first guiding hole to restrict the second shaft section from axially sliding into the first guiding hole along the second guiding hole.

[0013] In one embodiment, the diameter of the second shaft section matches the width of the second guiding hole, so that the second shaft section moves in the second direction within the second guiding hole and is restricted from moving in the first direction; wherein, the width direction of the second guiding hole is the first direction.

[0014] In one embodiment, the clearance distance between the hole wall of the second guiding hole perpendicular to its extending direction and the outer wall of the second shaft section is between 0.1 mm and 1 mm.

[0015] In one embodiment, the second shaft section has a second axis, and the second axis is parallel to the first axis;

[0016] Taking the first length as the distance between the first axis and the second axis, the moving distance of the second shaft section in the second direction within the second guiding hole is greater than or equal to twice the first length.

[0017] In one embodiment, the first direction is perpendicular to the second direction.

[0018] In one embodiment, the extrusion mechanism further includes a second mounting member, and the first mounting member and the second mounting member are spaced apart along the axis direction of the first shaft section; the second mounting member is configured with a third guiding hole and a fourth guiding hole;

[0019] The eccentric shaft further includes a third shaft section having a third axis, and the third shaft section is connected to one of the first shaft section and the second shaft section;

[0020] When the third axis coincides with the axis of the first shaft section; at least part of the third shaft section is configured to be within the third guiding hole and capable of moving along the first direction, and the third shaft section is restricted from moving in the second direction; or,

[0021] When the third axis coincides with the axis of the second shaft section, at least part of the third shaft section is configured to be within the fourth guiding hole and capable of moving along the second direction, and the third shaft section is restricted from moving in the first direction.

[0022] In one embodiment, the eccentric shaft further includes a fourth shaft section having a fourth axis, and the fourth shaft section is connected to the third shaft section;

[0023] When the third axis coincides with the axis of the first shaft section, the fourth axis coincides with the axis of the second shaft section, and at least part of the fourth shaft section is configured to be within the fourth guiding hole and capable of moving along the second direction, and the fourth shaft section is restricted from moving in the first direction; or,

[0024] When the third axis coincides with the axis of the second shaft section, the fourth axis coincides with the axis of the first shaft section, and at least part of the fourth shaft section is configured to be within the third guiding hole and capable of moving along the first direction, and the fourth shaft section is restricted from moving in the second direction.

[0025] In one embodiment, the extrusion mechanism further includes an adjusting flap, and the adjusting flap has an adjusting position and a locking position relative to the eccentric shaft;

[0026] In the adjusting position, the adjusting flap is separated from the eccentric shaft so that the eccentric shaft can rotate relative to the second mounting member; in the locking position, the adjusting flap presses against the side wall of the eccentric shaft so that the eccentric shaft is fixed relative to the second mounting member.

[0027] In one embodiment, the eccentric shaft further includes a fifth shaft section connected to the fourth shaft section. The fifth shaft section passes through the third guide hole and the fourth guide hole, and at least partially extends out of the second mounting member along the thickness direction of the second mounting member. The fifth shaft section is configured with an abutting portion that is recessed inwardly along its radial direction. In the locked position, the adjusting flap is pressed against the abutting portion to restrict the rotation of the eccentric shaft relative to the second mounting member.

[0028] In one embodiment, the number of the abutting portions is multiple, and the multiple abutting portions are arranged at intervals along the circumferential direction of the fifth shaft section.

[0029] In one embodiment, it further includes an adjusting wheel disc. The adjusting wheel disc is mounted on the fifth shaft section. The adjusting wheel disc is configured with multiple rotation marks, and the position of each rotation mark corresponds to the position of one of the abutting portions.

[0030] The present invention also provides a 3D printing system, which can solve at least one of the above technical problems.

[0031] The 3D printing system provided by the present invention includes a frame, and further includes the above-mentioned extrusion mechanism, and the extrusion mechanism is mounted on the frame.

[0032] Advantages of the present invention:

[0033] An extrusion mechanism provided by the present invention is mounted on a 3D printing system. When it is necessary to adjust the center distance between the first extrusion wheel and the second extrusion wheel due to different hardnesses of the printing consumables, at this time, the eccentric shaft is rotated, so that the first shaft section moves in the first direction in the first guide hole and does not move in the second direction, and the second shaft section moves in the second direction in the second guide hole and does not move in the first direction. Since in this adjustment movement process, the second extrusion wheel is sleeved and fixed on the second shaft section, and the second shaft section only moves in the second direction, when the second extrusion wheel moves closer to or away from the first extrusion wheel driven by the second shaft section, the plane where the center axis connection line of the two extrusion wheels is located and the feeding direction are always the same as the initial state. Therefore, after the center distance adjustment is completed, the printing consumables are not prone to tilt and curl during the extrusion process, the extrusion effect of the printing consumables is better, and finally the quality of the printed model is higher. Description of the drawings

[0034] Figure 1 is the first schematic diagram of the extrusion mechanism provided by an embodiment of the present invention;

[0035] Figure 2 is Figure 1 the second schematic diagram of the extrusion mechanism shown;

[0036] Figure 3 isFigure 1 The third schematic diagram of the extrusion mechanism shown;

[0037] Figure 4 is Figure 1 The exploded view of the first mounting member, the second mounting member, the second extrusion wheel and the eccentric shaft in the extrusion mechanism shown;

[0038] Figure 5 is Figure 1 The front view of the extrusion mechanism shown;

[0039] Figure 6 is Figure 1 The schematic diagram of the eccentric shaft of the extrusion mechanism shown;

[0040] Figure 7 is Figure 1 The partial enlarged view at position A of the extrusion mechanism shown;

[0041] Figure 8 is Figure 1 The right view of the first mounting member of the extrusion mechanism shown;

[0042] Figure 9 is Figure 8 The left view of the first mounting member of the extrusion mechanism shown;

[0043] Figure 10 is Figure 1 The schematic diagram of the second mounting member of the extrusion mechanism shown;

[0044] Figure 11 is Figure 10 The right view of the second mounting member of the extrusion mechanism shown;

[0045] Figure 12 is Figure 10 The left view of the second mounting member of the extrusion mechanism shown;

[0046] Figure 13 is Figure 1 The schematic diagram of the limit position of the movement track of the eccentric shaft of the extrusion mechanism shown.

[0047] Reference numerals: 100 - first extrusion wheel; 200 - second extrusion wheel; 300 - eccentric shaft; 310 - first shaft section; 311 - first axis; 320 - second shaft section; 321 - second axis; 330 - third shaft section; 340 - fourth shaft section; 350 - fifth shaft section; 351 - abutting portion; 400 - mounting member; 410 - first mounting member; 411 - first guiding hole; 412 - second guiding hole; 420 - second mounting member; 421 - third guiding hole; 422 - fourth guiding hole; 423 - guiding plate; 4231 - third guiding hole; 424 - clamping plate; 4241 - clamping groove; 500 - adjusting flap; 600 - adjusting wheel disc; 610 - rotation mark; 710 - driving member; 720 - transmission member; 800 - printing consumables. Detailed implementation manners

[0048] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the following will describe the detailed implementation manners of the present invention with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0049] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing 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 construed as a limitation of the present invention.

[0050] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0051] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed broadly. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0053] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0054] Referring to Figures 1 - 6 、 Figures 8 - 9 and Figure 13 , Figure 1 shows a first schematic diagram of an extrusion mechanism provided by an embodiment of the present invention; Figure 2 shows Figure 1 a second schematic diagram of the extrusion mechanism shown in Figure 3 shows Figure 1 a third schematic diagram of the extrusion mechanism shown in Figure 4 shows Figure 1 an exploded view of a first mounting member 410, a second mounting member 420, a second extrusion wheel 200 and an eccentric shaft 300 in the extrusion mechanism shown in Figure 5 shows Figure 1 a front view of the extrusion mechanism shown in Figure 6 shows Figure 1 a schematic diagram of the eccentric shaft 300 of the extrusion mechanism shown in Figure 8 shows Figure 1Right view of the first mounting member 410 of the extrusion mechanism shown;

[0055] Figure 9 Shows Figure 8 Left view of the first mounting member 410 of the extrusion mechanism shown; Figure 13 Shows Figure 1 Schematic diagram of the limit positions of the movement trajectory of the eccentric shaft 300 of the extrusion mechanism shown.

[0056] An extrusion mechanism provided by an embodiment of the present invention includes a first extrusion wheel 100, a second extrusion wheel 200, an eccentric shaft 300, and a first mounting member 410. The second extrusion wheel 200 is disposed opposite to the first extrusion wheel 100 and cooperates therewith to perform an extrusion operation; the eccentric shaft 300 includes a first shaft segment 310 and a second shaft segment 320 that are parallel to each other and are eccentrically disposed in sequence in the length direction of the eccentric shaft 300; the second extrusion wheel 200 is sleeved and fixed on the second shaft segment 320; the first mounting member 410 is configured with a first guiding hole 411 and a second guiding hole 412; at least a part of the first shaft segment 310 is disposed in the first guiding hole 411 and can move along a first direction, and the first shaft segment 310 is restricted from moving in a second direction; wherein, the second direction is the direction in which the second extrusion wheel 200 is disposed opposite to the first extrusion wheel 100, specifically, the second direction is the xx' direction in Figure 1 and Figure 8 ; the first direction is set at an angle to the second direction, specifically, the first direction is the zz' direction in Figure 1 and Figure 8 ; at least a part of the second shaft segment 320 is disposed in the second guiding hole 412 and can move along the second direction, and the second shaft segment 320 is restricted from moving in the first direction; when the eccentric shaft 300 rotates relative to the first mounting member 410, the second extrusion wheel 200 moves closer to or away from the first extrusion wheel 100 along the second direction.

[0057] Install the extrusion mechanism provided by the embodiment of the present invention on a 3D printing system. When it is necessary to adjust the center distance between the first extrusion wheel 100 and the second extrusion wheel 200 due to different hardnesses of the printing consumable 800, rotate the eccentric shaft 300 at this time, so that the first shaft section 310 moves in the first direction in the first guide hole 411 and does not move in the second direction, and the second shaft section 320 moves in the second direction in the second guide hole 412 and does not move in the first direction. Since in this adjustment movement process, the second extrusion wheel 200 is sleeved and fixed on the second shaft section 320, and the second shaft section 320 only moves in the second direction, when the second extrusion wheel 200 makes a approaching movement or a separating movement relative to the first extrusion wheel 100 driven by the second shaft section 320, the plane where the center axis connection line of the two extrusion wheels is located and the feeding direction are always the same as the initial state. Therefore, after the center distance adjustment is completed, the printing consumable 800 is not prone to tilting and curling during the extrusion process, the extrusion effect of the printing consumable 800 is better, and finally the quality of the printed model is higher.

[0058] Since the center distance between the two extrusion wheels of this extrusion mechanism is adjusted by rotating the eccentric shaft 300, compared with the method of adjusting the center distance between the two extrusion wheels by the elastic deformation amount of the spring itself, the adjustment distance of the center distance can be quantified and the adjustment amount is easy to control; at the same time, after the adjustment is completed, the positions of the two extrusion wheels are not easy to change, and then the position accuracy after the adjustment of the two extrusion wheels is relatively high, and the wire biting amount of the extrusion mechanism is relatively stable.

[0059] In one embodiment, when the hardness of the printing consumable 800 is relatively high, the deformation ability of the printing consumable 800 is relatively poor. In order to enable the printing consumable 800 to better extend between the first extrusion wheel 100 and the second extrusion wheel 200 and perform the extrusion operation, it is necessary to increase the center distance between the two extrusion wheels. At this time, rotate the eccentric shaft 300, so that the second extrusion wheel 200 makes a separating movement relative to the first extrusion wheel 100 in the second direction driven by the second shaft section 320. When the hardness of the printed consumable is relatively low, the deformation ability of the printing consumable 800 is relatively good. In order to enable the printing consumable 800 to perform the extrusion operation better, it is necessary to reduce the center distance between the two extrusion wheels. At this time, rotate the eccentric shaft 300, so that the second extrusion wheel 200 makes an approaching movement relative to the first extrusion wheel 100 in the second direction driven by the second shaft section 320, thus completing the adjustment of the center distance between the two extrusion wheels.

[0060] Please refer to Figure 13 , e is the first limit position where the first shaft section 310 moves in the first guide hole 411, f is the second limit position where the first shaft section 310 moves in the first guide hole 411, and c is the intersection of the first guide hole 411 and the second guide hole 412.

[0061] When the first shaft section 310 is located between c and e, if it is necessary to increase the center distance between the two extrusion wheels according to the hardness of the printing consumable 800, the eccentric wheel needs to be rotated in the Figure 11 clockwise direction in the figure, and at this time the first shaft section 310 moves downward along the Figure 11 zz' direction in the figure, and the second shaft section 320 moves leftward along the Figure 11 xx' direction in the figure, thereby driving the second extrusion wheel 200 to move leftward along the Figure 11 xx' direction in the figure; if it is necessary to reduce the center distance between the two extrusion wheels according to the hardness of the printing consumable 800, the eccentric wheel needs to be rotated in the Figure 11 counterclockwise direction in the figure, and at this time the first shaft section 310 moves upward along the Figure 11 zz' direction in the figure, and the second shaft section 320 moves rightward along the Figure 11 xx' direction in the figure, thereby driving the second extrusion wheel 200 to move rightward along the Figure 11 xx' direction in the figure. When the first shaft section 310 is located between c and f, the rotation direction of the eccentric shaft 300 during the adjustment process is opposite to the above, which will not be elaborated here.

[0062] It should be noted that the first extrusion wheel 100 and the second extrusion wheel 200 are arranged oppositely along the Figure 1 xx' direction in the figure, and the axes of the first extrusion wheel 100 and the second extrusion wheel 200 are both parallel to the Figure 1 yy' direction in the figure. Therefore, when the second extrusion wheel 200 moves closer to or away from the first extrusion wheel 100 along the second direction (that is, the Figure 1 xx' direction in the figure), the center distance between the first extrusion wheel 100 and the second extrusion wheel 200 can always be relatively constant along the yy' direction in the xy plane, so that during the use of the extrusion mechanism, when the first extrusion wheel 100 and the second extrusion wheel 200 perform the extrusion operation on the printing consumable 800, the force magnitudes on different parts of the first extrusion wheel 100 and the second extrusion wheel 200 along the yy' direction are relatively balanced.

[0063] Please refer to Figures 1 - 3, an extrusion mechanism provided by an embodiment of the present invention further includes a driving member 710 and a transmission member 720. The driving member 710 is used to connect to the frame. One end of the transmission member 720 is connected to the power output end of the driving member 710, and the other end of the transmission member 720 is connected to the rotating shaft of the first extrusion wheel 100. The transmission member 720 transmits the driving force of the driving member 710 to the first extrusion wheel 100, thereby driving the first extrusion wheel 100 to rotate around its own axis. The printing consumable 800 can be fed between the first extrusion wheel 100 and the second extrusion wheel 200. Driven by the first extrusion wheel 100 and the printing consumable 800, the second extrusion wheel 200 rotates in a direction opposite to the rotation direction of the first extrusion wheel 100, so that the printing consumable 800 is squeezed by the first extrusion wheel 100 and the second extrusion wheel 200. In one specific embodiment, the driving member 710 is a motor, the transmission member 720 is a worm and worm gear transmission, the first extrusion wheel 100 is a driving extrusion wheel, and the second extrusion wheel 200 is an idler wheel.

[0064] Please refer to Figure 6 , in one specific embodiment, the distance d between the axis of the first shaft section 310 and the axis of the second shaft section 320 is 0.15 mm, and the center distance between the first extrusion wheel 100 and the second extrusion wheel 200 is 10 mm. That is, when the connection line between the first axis 311 and the second axis 321 is parallel to the zz direction, the center distance between the first extrusion wheel 100 and the second extrusion wheel 200 is 10 mm. At this time, the maximum center distance between the first extrusion wheel 100 and the second extrusion wheel 200 is 10.15 mm, and the minimum center distance between the first extrusion wheel 100 and the second extrusion wheel 200 is 9.85 mm.

[0065] The following specifically describes the structure of the extrusion mechanism. Please refer to Figure 6 and Figure 8 , the first shaft section 310 and the second shaft section 320 of the extrusion mechanism provided by an embodiment of the present invention are connected to each other, and the first guiding hole 411 and the second guiding hole 412 communicate with each other in the direction of the first axis 311. Among them, the first axis 311 is the axis of the first shaft section 310. When the eccentric shaft 300 rotates relative to the first mounting member 410, since the first shaft section 310 and the second shaft section 320 are connected to each other, the first shaft section 310 moves in the first guiding hole 411 in the first direction, and the second shaft section 320 moves in the second guiding hole 412 communicating with the first guiding hole 411 in the second direction. During the entire movement process, the contact force receiving points between the first shaft section 310 and the hole wall of the first guiding hole 411, and the contact force receiving points between the second shaft section 320 and the hole wall of the second guiding hole 412 are along Figure 1 the yy' direction in Figure 1The bending moment in the yy' direction is small, and the eccentric shaft 300 is not easily bent; at the same time, compared with the case where the first guide hole 411 and the second guide hole 412 are respectively arranged on two first mounting members 410 oppositely arranged along the first axis 311, it is also more convenient to install the eccentric shaft 300 on the first mounting member 410.

[0066] Please refer to Figure 8 and Figure 9 , in the extrusion mechanism provided by an embodiment of the present invention, the projections of the first guide hole 411 and the second guide hole 412 on a plane perpendicular to the first axis 311 have an overlapping area. Since the projections of the first guide hole 411 and the second guide hole 412 on a plane perpendicular to the first axis 311 have an overlapping area, compared with the case where the first guide hole 411 and the second guide hole 412 are arranged out of alignment in the zz direction and do not have an overlapping area, when the extension length of the first guide hole 411 is fixed, the moving distance of the second shaft section 320 in the second guide hole 412 is longer, because during the movement of the first shaft section 310 and the second shaft section 320, the included angle between the projection of their connection line on the xz plane and the xx' direction is smaller. When the included angle between the projection of their connection line on the xz plane and the xx' direction is at the minimum value, at this time, the second shaft section 320 can move to its limit position along the second direction of itself.

[0067] In one embodiment, the diameter of the second shaft section 320 is greater than the width of the first guide hole 411 to limit the second shaft section 320 from axially sliding into the first guide hole 411 along the second guide hole 412. When the second shaft section 320 moves in the second guide hole 412 to the intersection of the first guide hole 411 and the second guide hole 412, the second shaft section 320 will not axially slide into the first guide hole 411 along the second guide hole 412 and move in the first direction in the first guide hole, so that during the movement of the second shaft section 320, it can always only slide in the second direction in the second guide hole, and during the adjustment process, the accuracy of maintaining its own moving direction is relatively high.

[0068] Please refer to Figure 13 , in the extrusion mechanism provided by an embodiment of the present invention, the diameter of the second shaft section 320 matches the width of the second guide hole 412, so that the second shaft section 320 moves in the second direction in the second guide hole and restricts the second shaft section 320 from moving in the first direction; wherein, the width direction of the second guide hole 412 is the first direction, that is Figure 13in the zz' direction. Since the diameter of the second shaft section 320 matches the width of the second guiding hole 412, when the second shaft section 320 moves in the second guiding hole 412 along the second direction, it is not likely to have a serious up-and-down jumping situation. Furthermore, when adjusting the center distance between the second extrusion wheel 200 and the first extrusion wheel 100, the angle of the plane where the central axes of the second extrusion wheel 200 and the first extrusion wheel 100 are located is not likely to change significantly.

[0069] In one embodiment, the clearance distance between the hole wall of the second guiding hole 412 perpendicular to its extending direction and the outer wall of the second shaft section 320 is between 0.1 mm and 1 mm. By setting the clearance between the two to be between 0.1 mm and 1 mm, when the second shaft section 320 moves in the second guiding hole 412 along the second direction, while effectively ensuring smooth movement, it is not likely to have an up-and-down jumping situation.

[0070] Please refer to Figure 6 , the second shaft section 320 of the extrusion mechanism provided by an embodiment of the present invention has a second axis 321, and the second axis 321 is parallel to the first axis 311; taking the first length as the distance between the first axis 311 and the second axis 321, the moving distance of the second shaft section 320 in the second guiding hole 412 along the second direction is greater than or equal to twice the first length.

[0071] Specifically, the first length is Figure 6 d in , since the moving distance of the second shaft section 320 in the second guiding hole 412 is greater than or equal to twice the first length, the adjustment range of the center distance between the first extrusion wheel 100 and the second extrusion wheel 200 is greater than or equal to twice the first length, that is, greater than or equal to twice d, so that the adjustment range of the center distance between the first extrusion wheel 100 and the second extrusion wheel 200 is relatively wide, and it can adapt to more printing consumables 800 with different hardnesses

[0072] In one specific embodiment, please refer to Figure 13 , when the width of the first guiding hole 411 perpendicular to the first direction is greater than the diameter of the first shaft section 310, that is Figure 8 and Figure 13 in , when the width of the first guiding hole 411 along the xx' direction is greater than the diameter of the first shaft section 310, if the first shaft section 310 moves in the first guiding hole 411 along the yy' direction, it can also move along the xx' direction. Therefore, when the second shaft section 320 moves in the second guiding hole 412 along the second direction, the maximum moving distance is the sum of twice the first length d and the value by which the first guiding hole 411 is greater than the diameter of the first shaft section 310. Therefore, when the second extrusion wheel 200 moves closer to or away from the first extrusion wheel 100 along the second direction, the adjustment range of its center distance is greater than twice the first length.

[0073] In another specific embodiment, when the width of the first guiding hole 411 perpendicular to the first direction is exactly equal to the diameter of the first shaft section 310, that is Figure 8 and Figure 13 in, when the width of the first guiding hole 411 along the xx' direction is equal to the diameter of the first shaft section 310, the first shaft section 310 can only move in the yy' direction within the first guiding hole 411. Therefore, when the second shaft section 320 moves in the second guiding hole 412 along the second direction, the maximum moving distance is twice the first length d. Therefore, when the second extrusion wheel 200 moves closer to or away from the first extrusion wheel 100 along the second direction, the adjustment range of the center distance is equal to twice the first length.

[0074] Please refer to Figure 8 and Figure 13 , in an embodiment of the present invention, the first direction of the extrusion mechanism is perpendicular to the second direction. Since the first direction is perpendicular to the second direction, when the eccentric wheel rotates relative to the first mounting member 410, when the first shaft section 310 moves to its own first limit position e or second limit position f within the first guiding hole 411, the second shaft section 320 can move to the intersection c of the first guiding hole 411 and the second guiding hole 412. Please continue to refer to Figure 11 , a is the third limit position where the second shaft section 320 moves in the second guiding hole 412, and b is the fourth limit position where the second shaft section 320 moves in the second guiding hole 412. When the second shaft section 320 moves to its own third limit position a and fourth limit position b within the second guiding hole 412, the first shaft section 310 can move to the intersection c of the first guiding hole 411 and the second guiding hole 412. Compared with the case where the included angle between the first direction and the second direction is less than 90°, when the limit positions of the second shaft section 320 are the same, the extension length of the first guiding hole 411 can be smaller.

[0075] Please refer to Figures 10 - 12 , Figure 10 shows Figure 1 a schematic diagram of the second mounting member 420 of the extrusion mechanism shown in Figure 11 shows Figure 10 a right view of the second mounting member 420 of the extrusion mechanism shown in Figure 12 shows Figure 10 a left view of the second mounting member 420 of the extrusion mechanism shown in. At the same time, please refer to Figures 1 - 4 and combine with Figure 4 and Figure 6, an extrusion mechanism provided by an embodiment of the present invention further includes a second mounting member 420. The first mounting member 410 and the second mounting member 420 are arranged at intervals along the axis direction of the first shaft section 310. The second mounting member 420 is configured with a third guiding hole 421 and a fourth guiding hole 422. The eccentric shaft 300 further includes a third shaft section 330 having a third axis, and the third shaft section 330 is connected to one of the first shaft section 310 and the second shaft section 320.

[0076] In one embodiment, when the third axis coincides with the axis of the first shaft section 310; at least a part of the third shaft section 330 is disposed in the third guiding hole 421 and can move along the first direction, and the third shaft section 330 is restricted from moving in the second direction.

[0077] In another embodiment, when the third axis coincides with the axis of the second shaft section 320, at least a part of the third shaft section 330 is disposed in the fourth guiding hole 422 and can move along the second direction, and the third shaft section 330 is restricted from moving in the first direction.

[0078] By providing the third shaft section 330, the third shaft section 330 is matched with the third guiding hole 421 or the fourth guiding hole 422 of the second mounting member 420, so that the two ends of the eccentric shaft 300 along its length direction are respectively subjected to the supporting forces provided by the first mounting member 410 and the second mounting member 420. The connection between the eccentric shaft 300 and the first mounting member 410 and the second mounting member 420 is relatively firm, and when the eccentric shaft 300 rotates relative thereto, the rotation process is also relatively safe, and the eccentric shaft 300 is not easily separated from the first mounting member 410 or the second mounting member 420.

[0079] Please refer to Figure 4 and Figure 6 , the eccentric shaft 300 of the extrusion mechanism provided by an embodiment of the present invention further includes a fourth shaft section 340 having a fourth axis, and the fourth shaft section 340 is connected to the third shaft section 330;

[0080] In one embodiment, when the third axis coincides with the axis of the first shaft section 310, the fourth axis coincides with the axis of the second shaft section 320, and at least a part of the fourth shaft section 340 is disposed in the fourth guiding hole 422 and can move along the second direction, and the fourth shaft section 340 is restricted from moving in the first direction.

[0081] In another embodiment, when the third axis coincides with the axis of the second shaft section 320, the fourth axis coincides with the axis of the first shaft section 310, and at least a part of the fourth shaft section 340 is disposed in the third guiding hole 421 and can move along the first direction, and the fourth shaft section 340 is restricted from moving in the second direction.

[0082] By providing the fourth shaft segment 340, the first shaft segment 310 and the second shaft segment 320 are engaged with the first mounting member 410, and the third shaft segment 330 and the fourth shaft segment 340 are engaged with the second mounting member 420, thereby making the connections between the two ends of the eccentric shaft 300 and the first mounting member 410 and the second mounting member 420 more stable, and when the eccentric shaft 300 rotates relative thereto, the rotation process is safer.

[0083] Please refer to Figure 7 , Figure 7 which shows Figure 1 a partial enlarged view of the position A of the extrusion mechanism shown, and at the same time please refer to Figure 2 and Figure 5 , the extrusion mechanism provided by an embodiment of the present invention further includes an adjusting flap 500, and the adjusting flap 500 has an adjusting position and a locking position relative to the eccentric shaft 300. In the adjusting position, the adjusting flap 500 is separated from the eccentric shaft 300 so that the eccentric shaft 300 can rotate relative to the second mounting member 420; in the locking position, the adjusting flap 500 presses against the side wall of the eccentric shaft 300 so that the eccentric shaft 300 is fixed relative to the second mounting member 420. By providing the adjusting flap 500, when it is necessary to adjust the center distance between the second extrusion wheel 200 and the first extrusion wheel 100, the adjusting flap 500 is adjusted to the adjusting position, and at this time, the eccentricity is rotated for adjustment. After the adjustment is completed, the adjusting flap 500 is adjusted to the locking position, so that the eccentric shaft 300 is fixed relative to the second mounting member 420, thereby making the center distance between the second extrusion wheel 200 and the first extrusion wheel 100 not easily change at this position.

[0084] Please refer to Figures 4 - 7 , the eccentric shaft 300 of the extrusion mechanism provided by an embodiment of the present invention further includes a fifth shaft segment 350 connected to the fourth shaft segment 340. The fifth shaft segment 350 passes through the third guiding hole 421 and the fourth guiding hole 422 and at least partially extends out of the second mounting member 420 along the thickness direction of the second mounting member 420. The fifth shaft segment 350 is configured with an abutting portion 351 that is recessed inwardly along its radial direction; in the locking position, the adjusting flap 500 presses against the abutting portion 351 to limit the rotation of the eccentric shaft 300 relative to the second mounting member 420. By providing the abutting portion 351 that is recessed inwardly along the radial direction of the fifth shaft segment 350, when the adjusting flap 500 is in the locking position, it presses against the abutting portion 351 by itself to limit the rotation of the eccentric shaft 300 relative to the second mounting member 420, which is very simple and convenient.

[0085] Please refer to Figure 10 and Figure 11The second mounting member 420 of the extrusion mechanism provided in one embodiment of the present invention further includes a clamping plate 424 protruding along the thickness direction of the second mounting member 420 toward the side away from the first mounting member 410, and a clamping groove 4241 is configured on the clamping plate 424. When the adjustment baffle 500 is placed in the clamping groove 4241, the adjustment baffle 500 is in a locked position, and the adjustment baffle 500 is pressed against the abutment portion 351. When the adjustment baffle 500 is separated from the clamping groove 4241, the adjustment baffle 500 is in an unlocked position.

[0086] See also Figure 2 , Figure 4 and Figure 5 The number of the abutting parts 351 of the extrusion mechanism provided in one embodiment of the present invention is multiple, and the multiple abutting parts 351 are arranged at intervals along the circumference of the fifth shaft segment 350. By providing multiple abutting parts 351, the eccentric shaft 300 can be fixed relative to the second mounting member 420 by adjusting the pressing effect of the baffle 500 and the abutting parts 351 at a specific position during the rotation process, thereby making the eccentric shaft 300 have a multi-gear adjustable function. Therefore, different printing consumables 800 can select different gears corresponding to their hardness, and the operation is very convenient.

[0087] In one specific embodiment, the number of the abutment parts 351 is four, so the eccentric shaft 300 has a four-speed adjustable function. When the distance d between the axes of the first shaft section 310 and the second shaft section 320 is 0.15mm, and the center distance between the first extrusion wheel 100 and the second extrusion wheel 200 is 10mm, the center distance of the first gear can be set to 9.85mm, the center distance of the second gear is 10mm, the center distance of the third gear is 10.15mm, and the center distance of the fourth gear is 10mm. It should be noted that there is no restriction on the number of the abutment parts 351, and the number and angle can be adjusted adaptively according to the hardness of different printing consumables 800.

[0088] See also Figure 1 , Figure 3 and Figure 7 The extrusion mechanism provided in one embodiment of the present invention further includes an adjusting wheel 600, which is mounted on the fifth shaft segment 350. The adjusting wheel 600 is configured with a plurality of rotation marks 610, and the position of each rotation mark 610 corresponds to the position of one of the abutting portions 351. By setting the rotation marks 610 on the adjusting wheel 600, and the position of each rotation mark 610 corresponds to the position of one of the abutting portions 351, when the adjusting wheel 600 is rotated to adjust the rotation angle of the eccentric shaft 300, the rotation angle can be determined by the rotation marks 610, so that the gear adjustment is visualized, with high accuracy and convenience.

[0089] Please refer to Figure 4 and Figure 8 In an embodiment of the present invention, the second mounting member 420 of the extrusion mechanism further includes a guide plate 423. The guide plate 423 is convexly provided along the thickness direction of the second mounting member 420. A third guide hole 4231 is provided on the guide plate 423. The printing consumable 800 can pass through the third guide hole 4231 and be fed between the first extrusion wheel 100 and the second extrusion wheel 200. Through the guiding action of the guide plate 423, the feeding position and feeding angle of the printing consumable 800 can be effectively guaranteed.

[0090] An embodiment of the present invention further provides a 3D printing system, which includes a frame and also includes the above-mentioned extrusion mechanism. The extrusion mechanism is installed on the frame and can achieve at least one technical effect.

[0091] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0092] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent should be subject to the appended claims.

Claims

1. An extrusion mechanism, characterized in that, The extrusion mechanism includes: A first extrusion wheel; A second extrusion wheel, which is disposed opposite to the first extrusion wheel and cooperates with each other to perform an extrusion operation; An eccentric shaft, which includes a first shaft segment and a second shaft segment that are parallel to each other and eccentrically arranged in sequence in the length direction of the eccentric shaft; the second extrusion wheel is sleeved and fixed on the second shaft segment; A first mounting member, which is configured with a first guiding hole and a second guiding hole; at least part of the first shaft segment is disposed in the first guiding hole and can move along a first direction, and the first shaft segment is restricted from moving in a second direction; wherein, the second direction is the direction in which the second extrusion wheel is disposed opposite to the first extrusion wheel, and the first direction is perpendicular to the second direction; at least part of the second shaft segment is disposed in the second guiding hole and can move along the second direction, and the second shaft segment is restricted from moving in the first direction; when the eccentric shaft rotates relative to the mounting member, the second extrusion wheel moves closer to or away from the first extrusion wheel along the second direction.

2. The extrusion mechanism according to claim 1, wherein, The first shaft segment and the second shaft segment are connected to each other, and the first guiding hole and the second guiding hole communicate with each other in the first axis direction, wherein the first axis is the axis of the first shaft segment.

3. The extrusion mechanism according to claim 2, wherein, The projections of the first guiding hole and the second guiding hole on a plane perpendicular to the first axis have an overlapping area.

4. The extrusion mechanism according to claim 3, wherein, The diameter of the second shaft segment is greater than the width of the first guiding hole to restrict the second shaft segment from axially sliding into the first guiding hole along the second guiding hole.

5. The extrusion mechanism according to claim 2, wherein, The diameter of the second shaft segment matches the width of the second guiding hole, so that the second shaft segment can move along the second direction in the second guiding hole and is restricted from moving in the first direction; wherein, the width direction of the second guiding hole is the first direction.

6. The extrusion mechanism according to claim 2, wherein The second shaft segment has a second axis, and the second axis is parallel to the first axis; Taking the first length as the distance between the first axis and the second axis, the moving distance of the second shaft segment along the second direction in the second guiding hole is greater than or equal to twice the first length.

7. The extrusion mechanism according to any one of claims 1-6, characterized in that, The first direction is perpendicular to the second direction.

8. The extrusion mechanism according to claim 7, wherein, The extrusion mechanism further includes a second mounting member, and the first mounting member and the second mounting member are spaced apart along the axis direction of the first shaft segment; the second mounting member is configured with a third guiding hole and a fourth guiding hole; The eccentric shaft further includes a third shaft segment having a third axis, and the third shaft segment is connected to one of the first shaft segment and the second shaft segment; When the third axis coincides with the axis of the first shaft segment; at least part of the third shaft segment is disposed in the third guiding hole and can move along the first direction, and the third shaft segment is restricted from moving in the second direction; or, When the third axis coincides with the axis of the second shaft segment, at least part of the third shaft segment is disposed in the fourth guiding hole and can move along the second direction, and the third shaft segment is restricted from moving in the first direction.

9. The extrusion mechanism according to claim 8, wherein, The eccentric shaft further includes a fourth shaft segment having a fourth axis, and the fourth shaft segment is connected to the third shaft segment; When the third axis coincides with the axis of the first shaft segment, the fourth axis coincides with the axis of the second shaft segment, and at least a part of the fourth shaft segment is disposed in the fourth guiding hole and can move along the second direction, and the fourth shaft segment is restricted from moving in the first direction; or, When the third axis coincides with the axis of the second shaft segment, the fourth axis coincides with the axis of the first shaft segment, and at least a part of the fourth shaft segment is disposed in the third guiding hole and can move along the first direction, and the fourth shaft segment is restricted from moving in the second direction.

10. The extrusion mechanism according to claim 9, characterized in that, The extrusion mechanism further includes an adjusting flap, and the adjusting flap has an adjusting position and a locking position relative to the eccentric shaft; In the adjusting position, the adjusting flap is separated from the eccentric shaft so that the eccentric shaft can rotate relative to the second mounting member; In the locking position, the adjusting flap presses against the side wall of the eccentric shaft so that the eccentric shaft is fixed relative to the second mounting member.

11. The extrusion mechanism according to claim 10, characterized in that, The eccentric shaft further includes a fifth shaft segment connected to the fourth shaft segment, the fifth shaft segment passes through the third guiding hole and the fourth guiding hole and at least partially extends out of the second mounting member along the thickness direction of the second mounting member, and the fifth shaft segment is configured with an abutting portion that is recessed inward in the radial direction thereof; in the locking position, the adjusting flap presses against the abutting portion to restrict the eccentric shaft from rotating relative to the second mounting member.

12. The extrusion mechanism according to claim 11, wherein, The number of the abutting portions is multiple, and the multiple abutting portions are arranged at intervals along the circumferential direction of the fifth shaft segment.

13. The extrusion mechanism according to claim 12, wherein It further includes an adjusting wheel disc, the adjusting wheel disc is mounted on the fifth shaft segment, and the adjusting wheel disc is configured with a plurality of rotation marks, and the position of each rotation mark corresponds to the position of one of the abutting portions.

14. A 3D printing system, characterized in that, It includes a frame, and further includes the extrusion mechanism according to any one of claims 1-13, and the extrusion mechanism is mounted on the frame.

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