Extrusion mechanism and 3D printing device using its

Abstract

Extrusion mechanism used for extruding a consumable material, characterized in that the extrusion mechanism comprises: a helical gear pair, wherein one helical gear of the helical gear pair is connected to a torque output end of the extrusion mechanism, and wherein the other helical gear of the helical gear pair is engaged with the other helical gear via a helical tooth; an extrusion gear pair, wherein the other helical gear of the helical gear pair is drivingly connected to an extrusion gear of the extrusion gear pair, and wherein the extrusion gear pair is used for clamping and extruding the consumable material; and a transmission element connected to the other extrusion wheel of the extrusion wheel pair for adjusting the clamping state of the extrusion wheel pair to the consumable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of 3D printing, in particular to an extrusion mechanism and a 3D printing apparatus using the same. STATE OF THE ART

[0002] 3D printing is a rapid prototyping technology for producing three-dimensional physical objects by printing materials layer by layer based on a digital model file and using bondable materials such as special waxes, metal powders, or plastics. Fused deposition rapid molding is one of the most important 3D printing technologies. In this technology, a hot-melt filament is heated and melted, then extruded from a print head to deposit it onto a molding platform or a preceding layer of cured material, ultimately creating a physical object.

[0003] For the use of plastic consumables, fused filament deposition technology is commonly used. In this technology, filamentous printing material is fed to the heating head and melted after heating. It is then extruded through a micro-nozzle nozzle and deposited onto the worktable. When the material temperature is lower than the curing temperature, curing begins, and the finished product is finally formed through the accumulation of layers of material. Consumable extrusion is a critical step in the 3D printing process. If the extrusion mechanism is unstable during consumable clamping or transfer, it will directly lead to instability in consumable transfer and printing, which in turn leads to poor printing results or even failure.

[0004] How to solve the above problems to provide a convenient, stable and reliable extrusion mechanism and a 3D printing device using it is a problem to be considered by the engineers in this field. CONTENT OF THIS APPLICATION

[0005] To solve the problems in the prior art, the embodiments of the present application provide a convenient, stable and reliable extrusion mechanism and a 3D printing apparatus using the same.

[0006] The embodiments of the present application provide an extrusion mechanism used for extruding a consumable material, the extrusion mechanism comprising: a helical gear pair, wherein one helical gear of the helical gear pair is connected to a torque output end of the extrusion mechanism, and wherein the other helical gear of the helical gear pair is engaged with the other helical gear via a helical tooth; an extrusion gear pair, wherein the other helical gear of the helical gear pair is drivingly connected to an extrusion gear of the extrusion gear pair, and wherein the extrusion gear pair is used for clamping and extruding the consumable material; and a transmission element connected to the other extrusion wheel of the extrusion wheel pair for adjusting the clamping state of the extrusion wheel pair to the consumable.

[0007] In one embodiment, the helical gear pair comprises a first transmission gear and a second transmission gear, wherein the first transmission gear is frictionally connected to a torque output end of the extrusion mechanism, and wherein the second transmission gear is engaged with the first transmission gear, and wherein the extrusion gear pair comprises a first extrusion gear and a second extrusion gear, and wherein the first extrusion gear is drivingly connected to the second transmission gear, and wherein the second extrusion gear is connected to the transmission element, and wherein the first extrusion gear and the second extrusion gear are spaced apart from each other and cooperate to clamp and extrude the consumable material.

[0008] In one embodiment, the extrusion mechanism further comprises a third transmission gear and a fourth transmission gear, wherein the third transmission gear is drivingly connected to the second transmission gear, and wherein the fourth transmission gear is drivingly connected to the first extrusion gear, and wherein the third transmission gear is in engagement with the fourth transmission gear.

[0009] In one embodiment, the third transmission gear and the second transmission gear are coaxially arranged and synchronously rotated by a first transmission shaft body, wherein the fourth transmission gear and the first extrusion gear are coaxially arranged and synchronously rotated by a second transmission shaft body.

[0010] In one embodiment, the extrusion mechanism further comprises a drive element which is the torque output end of the extrusion mechanism, wherein the first transmission gear is drivingly connected to the drive element, and wherein the first transmission gear and the second transmission gear are arranged side by side, and wherein the third transmission gear is arranged on a side of the second transmission gear facing away from the drive element, and wherein the third transmission gear and the fourth transmission gear are arranged side by side.

[0011] In one embodiment, the extrusion wheel pair comprises a first end portion and a second end portion spaced apart from each other, wherein the other extrusion wheel of the extrusion wheel pair and the transmission member are connected to each other between the first end portion and the second end portion; and wherein the extrusion mechanism further comprises a bracket movably connected to the first end portion such that the transmission member can be rotated with respect to the bracket; and wherein the extrusion mechanism further comprises a reset member disposed between the bracket and the transmission member and serving to enable the transmission member to drive the extrusion wheel pair to clamp the consumable material, wherein the force arm from the reset member to the first end portion is shorter than the force arm from the second end portion to the first end portion.

[0012] In one embodiment, the holder comprises a first main body part and a second main body part, wherein the second main body part is arranged on one side of the first main body part and is connected to the first main body part, and wherein a receiving cavity is provided on the first main body part in which the helical gear pair is arranged, and wherein the extrusion gear pair, the second main body part and the transmission element are located on the same side of the first main body part, and wherein the return element is arranged between the second main body part and the transmission element.

[0013] In one embodiment, the first end portion is rotatably connected to the first main body part, wherein the second end portion and the second main body part are spaced apart from each other, and wherein the return element is arranged between the second end portion and the second main body part, and wherein the return element is arranged on a side of the extrusion wheel pair connected to the transmission element facing away from the first end portion.

[0014] In one embodiment, the transmission element further comprises a mounting portion arranged between the first end portion and the second end portion, wherein the mounting portion comprises a first connecting plate and a second connecting plate which are spaced apart from each other, and wherein the mounting portion is provided with a through hole penetrating the first connecting plate and the second connecting plate, and wherein the other extrusion wheel of the extrusion wheel pair is arranged between the first connecting plate and the second connecting plate and is rotatably connected to the transmission element via a third transmission shaft.

[0015] The embodiments of the present application provide a 3D printing apparatus comprising a forming platform, a drive assembly, and an extrusion mechanism according to any one of the embodiments, wherein the drive assembly drives the extrusion mechanism to move relative to the forming platform.

[0016] Understandably, the extrusion mechanism of the present application is provided with a helical gear pair connecting a torque output end and a pair of extrusion gears, so that the torque output from the torque output end can be stably transmitted to the extrusion gears, thereby reducing vibration during the transmission process, lowering the overall vibration intensity of the extrusion mechanism, and further reducing the vibration intensity transmitted from the extrusion gears to the consumable, so as to improve the stability and reliability of the extrusion mechanism, reduce the vibration intensity transmitted to the 3D printing nozzle, and avoid the resulting vibration patterns during the printing process, thus improving the quality of 3D printing.One extrusion wheel of the extrusion wheel pair is drivingly connected to the torque output end via the helical gear pair, while the other extrusion wheel is connected to a transmission element to adjust the clamping state of the extrusion wheel pair to the consumable, thereby realizing the smooth extrusion of the consumable through the mutual cooperation of the two extrusion wheels. SHORT DESCRIPTION OF THE DRAWING Fig. 1 shows a three-dimensional schematic diagram of an extrusion mechanism provided by an embodiment of the present application; Fig. 2 shows a partial three-dimensional schematic diagram of an extrusion mechanism provided by an embodiment of the present application; Fig. 3 shows a partial three-dimensional schematic diagram of an extrusion mechanism provided by an embodiment of the present application; Fig. 4 shows a partial three-dimensional schematic diagram of an extrusion mechanism provided by an embodiment of the present application; Fig. 5 shows a partial schematic disassembly diagram of an extrusion mechanism provided by an embodiment of the present application; Fig. 6 shows a partial planar schematic diagram of an extrusion mechanism provided by an embodiment of the present application; Fig. 7 shows a partial schematic disassembly diagram of an extrusion mechanism provided by an embodiment of the present application; Fig. Figure 8 shows a three-dimensional schematic diagram of a 3D printing apparatus provided by an embodiment of the present application. List of reference symbols 10 Extrusion mechanism 101 transmission channel 11 helical gear pair 111 First transmission gear 1111 First column body 1112 First oblique tooth 112 Second transmission gear 1121 Second column body 1122 Second oblique tooth 113 Third transmission gear 12 pairs of extrusion wheels 121 First extrusion wheel 122 Second extrusion wheel 123 Groove structure 124 Fourth transmission gear 131 First transmission shaft body 132 Second transmission shaft body 133 Third transmission shaft body 14 Bracket 141 First main body part 1410 receiving cavity 142 Second main body part 1420 Recessed hole 15 Transmission element 151 First final section 152 Second final section 153 Assembly area 1531 First connecting plate 1532 Second connecting plate 1533 through hole 16 Drive element 161 functional bodies 162 Output shaft 17 Reset element 1 3D printing device 18 Forming platform 19 Drive assembly

[0017] The following specific embodiments further illustrate the present application in conjunction with the accompanying drawings. DETAILED DESCRIPTION

[0018] The contents of the present application will now be explained in more detail with reference to the accompanying drawings. In the accompanying drawings, exemplary embodiments of the present application are shown. However, the present application may be implemented in many different forms and should not be construed as limited to the exemplary embodiments shown herein. These exemplary embodiments are provided so that this application is thorough and complete, and to fully convey the scope of the present application to those skilled in the art. Like reference numerals are used to indicate the same or similar components. The terms used herein are for the purpose of describing particular exemplary embodiments only and are not intended to be limiting of this application.As used herein, the singular forms "a," "an," and "the" include the plural forms unless the context clearly indicates otherwise. Furthermore, the use of "including," "comprising," and / or "having" integers, steps, operations, components, and / or assemblies excludes the presence or addition of one or more other features, regions, integers, steps, operations, components, and / or groups thereof. Unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.Unless expressly defined in the text, terms as defined in general dictionaries shall be interpreted to have a meaning consistent with their meaning in the relevant art and in the subject matter of this application and shall not be interpreted to have an idealized or overly formal meaning.

[0019] For the use of plastic consumables, fused filament deposition technology is commonly used. This technology involves feeding filament printing material to the heating head and melting it after heating. It is then extruded through a print head with a micro-nozzle and deposited onto the worktable. When the material temperature is lower than the curing temperature, curing begins, and the finished product is finally formed through the accumulation of layers of material. Consumable extrusion is a critical step in the 3D printing process. If the extrusion mechanism is unstable during consumable clamping or transfer, it will directly lead to instability in consumable transfer and printing, which in turn leads to poor printing results or even failure.

[0020] Accordingly, the embodiments of the present application provide a convenient, stable, and reliable extrusion mechanism and a 3D printing apparatus using the same. The extrusion mechanism is used to extrude the consumable and includes a pair of helical gears, a pair of extrusion wheels, and a transmission element.A helical gear of the helical gear pair is connected to a torque output end of the extrusion mechanism, wherein one helical gear of the helical gear pair is engaged with the other via a helical tooth; and wherein the other helical gear of the helical gear pair is drivingly connected to an extrusion gear of the extrusion gear pair, and wherein the extrusion gear pair is used to clamp and extrude the consumable material; and wherein the transmission member is connected to the other extrusion gear of the extrusion gear pair to adjust the clamping state of the extrusion gear pair to the consumable material.

[0021] To this end, the extrusion mechanism of the present application is provided with a pair of helical gears connecting a torque output end and a pair of extrusion gears, so that the torque output from the torque output end can be stably transmitted to the extrusion gears, thereby reducing vibration during the transmission process, lowering the overall vibration intensity of the extrusion mechanism, and further reducing the vibration intensity transmitted from the extrusion gears to the consumable, so as to improve the stability and reliability of the extrusion mechanism, reduce the vibration intensity transmitted to the 3D printing nozzle, and avoid the resulting vibration waves during the printing process, thus improving the quality of 3D printing.One extrusion wheel of the extrusion wheel pair is drivingly connected to the torque output end via a helical gear pair, while the other extrusion wheel is connected to a transmission element to adjust the clamping state of the extrusion wheel pair to the consumable, thereby realizing the smooth extrusion of the consumable through the mutual cooperation of the two extrusion wheels.

[0022] As a person skilled in the art can understand, the term “3D printing” refers to a technology in which an object is constructed by printing layer by layer based on a digital model file using bondable materials such as metal or plastic powder.

[0023] The exemplary embodiments are explained in more detail below in conjunction with the accompanying drawings. Please note that the components shown in the accompanying drawings are not necessarily to scale; rather, identical or similar components are represented identically or similarly by the accompanying reference numerals or similar technical terms.

[0024] In conjunction with the accompanying drawings, the specific embodiments of the present application are explained in more detail below.

[0025] As in Fig. As shown in Figures 1 to 7, one embodiment of the present application provides an extrusion mechanism 10 for extruding a consumable material (not shown). The extrusion mechanism 10 includes a support 14, a transmission member 15, a return member 17, a drive member 17, a helical gear pair 11, and a pair of extrusion gears 12.The transmission element 15 and the return element 17 are arranged on the same side of the holder 14, wherein a functional body 161 of the drive element 16 is arranged on the other side of the holder 14, and wherein an output shaft 162 of the drive element 16 is non-positively connected through the holder 14 to the helical gear pair 11, which are accommodated in the holder 14, and wherein the extrusion gear pair 12 is located on a side of the helical gear pair 11 facing away from the functional body 161 of the drive element 16, and wherein an extrusion gear of the extrusion gear pair 12 is connected to the transmission element 15.

[0026] In one embodiment, one helical gear of the helical gear pair 11 is connected to a torque output end of the extrusion mechanism 10, and the other helical gear of the helical gear pair 11 is meshed with the other helical gear via a helical tooth. The other helical gear of the helical gear pair 11 is drivingly connected to an extrusion gear of the extrusion gear pair 12, which is used to clamp and extrude the consumable material. The transmission element 15 is connected to the other extrusion gear of the extrusion gear pair 12 to adjust the clamping state of the extrusion gear pair 12 to the consumable material.

[0027] In the present embodiment, the extrusion mechanism 10 includes a transfer channel 101 used for transferring the consumable material (not shown). The transfer channel 101 is located between the pair of extrusion wheels 12, and the transfer channel 101 is illustrated as a straight line for illustrative purposes. It should be understood that the specific shape of the transfer channel 101 can be adjusted according to the need for transferring the consumable material and the structure of the extrusion mechanism 10.

[0028] Understandably, the extrusion mechanism 10 of the present application is provided with a helical gear pair 11 connecting a torque output end and an extrusion gear pair 12, so that the torque output from the torque output end can be stably transmitted to the extrusion gear pair 12, thereby reducing vibration during the transmission process, lowering the overall vibration intensity of the extrusion mechanism 10, and further reducing the vibration intensity transmitted from the extrusion gear pair 12 to the consumable, so as to improve the stability and reliability of the extrusion mechanism 10, reducing the vibration intensity transmitted to the 3D printing nozzle, and avoiding the resulting vibration waves during the printing process, thus improving the quality of 3D printing.One extrusion wheel of the extrusion wheel pair 12 is drivingly connected to the torque output end via the helical gear pair 11, while the other extrusion wheel is connected to the transmission member 15 to adjust the clamping state of the extrusion wheel pair 12 to the consumable, thereby realizing the smooth extrusion of the consumable through the mutual cooperation of the extrusion wheel pair 12.

[0029] In one embodiment, the helical gear pair 11 comprises a first transmission gear 111 and a second transmission gear 112. The first transmission gear 111 is frictionally connected to the torque output end of the extrusion mechanism 10, the second transmission gear 112 is in mesh with the first transmission gear 111, and the first transmission gear 111 and the second transmission gear 112 are in mesh via a helical tooth.

[0030] In the present embodiment, the respective axes of the first transmission gear 111 and the second transmission gear 112 may be arranged in parallel, with the first transmission gear 111 and the second transmission gear 112 each having teeth inclined with respect to their respective axes. Specifically, the first transmission gear 111 and the second transmission gear 112 are each cylindrical helical gears, with the tooth lines spiraling along the cylinders;and wherein the first transmission gear 111 comprises a first column body 1111 and a first helical tooth 1112, and wherein the first column body 1111 is cylindrical, and wherein the first helical tooth 1112 is arranged on the outside of the first column body 1111 and is inclined with respect to its axis, and wherein the angle of inclination is in a range of 5° to 35° and may further be in a range of 8° to 25° or 5° to 35°, in particular the angle may be 9°, 10°, 11°, 12°, 13°, 14°, 15°, 16°, 17°, 18°, 19°, 20°, 21°, 22°, 23°, 24°, 26°, 27°, 28°, 29°, 30°, 31°, 32°, 33°, 34°;and wherein the second transmission gear 112 comprises a second column body 1121 and a second helical tooth 1122, and wherein the second column body 1121 is cylindrical, and wherein the second helical tooth 1122 is arranged on the outside of the second column body 1121 and is inclined with respect to its axis, and wherein the angle of inclination is in a range of 5° to 35° and may further be in a range of 8° to 25° or 5° to 35°, in particular the angle may be 9°, 10°, 11°, 12°, 13°, 14°, 15°, 16°, 17°, 18°, 19°, 20°, 21°, 22°, 23°, 24°, 26°, 27°, 28°, 29°, 30°, 31°, 32°, 33°, 34°;and wherein the inclination directions of the first helical tooth 1112 and the second helical tooth 1122 may be opposite, or the inclination directions of the first helical tooth 1112 and the second helical tooth 1122 may be symmetrical with respect to a tangent of the engagement surface of the first transmission gear 111 and the second transmission gear 112, so that the first transmission gear 111 and the second transmission gear 112 can be engaged.;

[0031] It is understood that the first transmission gear 111 and the second transmission gear 112 are each helical gears, which have the advantages of smooth transmission, reduced shock, vibration, and noise, as well as high transmission efficiency, high load capacity, and smooth operation. The first transmission gear 111 and the second transmission gear 112 are meshed, which not only realizes the transmission of the output torque, but also reduces vibration and improves the stability of the transmission process of the helical gear pair 11.In addition, the vibration transmitted from the helical gear pair 11 to the extrusion gear pair 12 is reduced or eliminated, the vibration transmitted from the extrusion gear pair 12 to the consumable is reduced or eliminated, and the vibration transmitted together with the consumable to the 3D printing nozzle is reduced or eliminated to reduce or avoid the generation of vibration patterns during 3D printing and improve the printing effect.

[0032] In one embodiment, the extrusion wheel pair 12 comprises a first extrusion wheel 121 and a second extrusion wheel 122, wherein the first extrusion wheel 121 is drivingly connected to the second transmission gear 112, and the second extrusion wheel 122 is connected to the transmission element 15. The first extrusion wheel 121 and the second extrusion wheel 122 are spaced apart from each other and cooperate to clamp and extrude the consumable material.

[0033] In the present embodiment, the first extrusion wheel 121 and the second extrusion wheel 122 may have substantially the same or completely identical dimensions, with the side surfaces of the first extrusion wheel 121 and the second extrusion wheel 122 each having recessed groove structures 123. The first extrusion wheel 121 and the second extrusion wheel 122 are arranged side by side so that the two recessed groove structures 123 are aligned to enable better clamping and transfer of the consumable material.

[0034] In particular, the first extrusion wheel 121 may be rotatably connected to the support 14, wherein the first extrusion wheel 121 is fixed to the support 14 by a part such as a rotating shaft or a pin, so that the first extrusion wheel 121 can rotate relative to the support 14, but its overall position relative to the support 14 is relatively fixed. At the same time, the second extrusion wheel 122 is movably connected to the support 14 via the transmission element 15, so that the second extrusion wheel 122 can be driven by the transmission element 15 to move closer to or away from the first extrusion wheel 121. The first extrusion wheel 121 and the second extrusion wheel 122 are arranged side by side so that the two recessed groove structures 123 are in corresponding positions, whereby the gap between the first extrusion wheel 121 and the second extrusion wheel 122 can accommodate the consumable material;and wherein the transmission element 15, under the drive of the return element 17, has a tendency to cause the second extrusion wheel 122 to squeeze toward the first extrusion wheel 121, so that the first extrusion wheel 121 and the second extrusion wheel 122 can squeeze and clamp the consumable material from both sides; when the transmission element 15 is subjected to other external forces, the transmission element 15 can drive the second extrusion wheel 122 to move toward a side facing away from the first extrusion wheel 121, so that the gap between the first extrusion wheel 121 and the second extrusion wheel 122 increases to release the clamping of the consumable material, whereby the consumable material can be removed from the gap between the first extrusion wheel 121 and the second extrusion wheel 122, which facilitates material replacement.

[0035] In one embodiment, the extrusion mechanism 10 further comprises a third transmission gear 113 and a fourth transmission gear 124. The third transmission gear 113 is drivingly connected to the second transmission gear 112, the fourth transmission gear 124 is drivingly connected to the first extrusion gear 121, and the third transmission gear 113 is in engagement with the fourth transmission gear 124.

[0036] In one embodiment, the third transmission gear 113 and the second transmission gear 112 are coaxially arranged and synchronously rotated by a first transmission shaft body 131, and the fourth transmission gear 124 and the first extrusion gear 121 are coaxially arranged and synchronously rotated by a second transmission shaft body 132.

[0037] In the present embodiment, the first transmission shaft body 131 is simultaneously connected to the third transmission gear 113 and the second transmission gear 112, so that the second transmission gear 112 can be drivingly connected to the third transmission gear 113 to output the rotational torque. At the same time, the second transmission gear 112 is not directly engaged with the third transmission gear 113, and the third transmission gear 113 can be a non-helical gear. The second transmission shaft body 132 is simultaneously connected to the fourth transmission gear 124 and the first extrusion gear 121, and the first transmission gear 111 can be disengaged from the fourth transmission gear 124 as long as the fourth transmission gear 124 is engaged with the third transmission gear 113.

[0038] In the present embodiment, the outer diameter of the third transmission gear 113 may be smaller than the outer diameter of the second transmission gear 112, and the outer diameter of the fourth transmission gear 124 may be slightly larger than the outer diameter of the first extrusion gear 121 in order to facilitate the arrangement of the third transmission gear 113 and the fourth transmission gear 124 between the helical gear pair 11 and the extrusion gear pair 12 for transmission.

[0039] In the present embodiment, the first transmission gear 111 is drivingly connected to the drive element 16, wherein the first transmission gear 111 and the second transmission gear 112 are arranged next to one another, and wherein the third transmission gear 113 is arranged on a side of the second transmission gear 112 facing away from the drive element 16, and wherein the third transmission gear 113 and the fourth transmission gear 124 are arranged next to one another.

[0040] It is understood that the first transmission gear 111 and the second transmission gear 112 are arranged side by side so that the drive member 16 can output the torque more smoothly; and the third transmission gear 113 and the fourth transmission gear 124 are arranged side by side to facilitate clamping of the consumable.

[0041] In one embodiment, the transmission element 15 comprises a first end portion 151 and a second end portion 152 that are spaced apart from one another, wherein the other extrusion wheel of the extrusion wheel pair 12 and the transmission element 15 are connected to one another between the first end portion 151 and the second end portion 152. The holder 14 is movably connected to the first end portion 151 so that the transmission element 15 can be rotated relative to the holder 14. The return element 17 is arranged between the holder 14 and the transmission element 15 and serves to enable the transmission element 15 to drive the extrusion wheel pair 12 to clamp the consumable material, wherein the force arm from the return element 17 to the first end portion 151 is shorter than the force arm from the second end portion 152 to the first end portion 151. The return element 17 can be a spring.

[0042] It is understood that the first end portion 151 of the transmission member 15 is rotatably connected to the bracket 14, and the movement of the transmission member 15 can be controlled by moving the second end portion 152. The adjustment of the clamping degree of the consumable is achieved by driving one extrusion wheel in the extrusion wheel pair 12 by the transmission member 15 to move relative to the other extrusion wheel. The return member 17 is arranged between the bracket 14 and the transmission member 15 and serves to enable the transmission member 15 to drive the extrusion wheel pair 12 to clamp the consumable. The clamping of the consumable by the extrusion wheel pair 12 can improve the stability and precision of the consumable transfer and improve the stability and reliability of the extrusion mechanism 10.The force arm from the return element 17 to the first end portion 151 is shorter than the force arm from the second end portion 152 to the first end portion 151, so that when it is necessary to move the transmission element 15 to separate the extrusion wheel pair 12 for feeding, the resistance force of the return element 17 can be more easily overcome, which improves the convenience of operation of the extrusion mechanism 10.

[0043] In the present embodiment, the drive element 16 may be an electric motor. The functional body 161 of the drive element 16 may be a part of the electric motor, including a conventional structure of an electric motor such as a housing (not shown), a coil (not shown), etc., and the output shaft 162 of the drive element 16 may be a structure connected to a rotor (not shown) to output torque. It should be understood that the drive element 16 is a known and feasible structure, and its structure and parameters, etc., will not be described here.

[0044] In one embodiment, the holder 14 comprises a first main body part 141 and a second main body part 142, wherein the second main body part 142 is arranged on one side of the first main body part 141 and connected to the first main body part. A receiving cavity 1410 is provided on the first main body part 141, in which the helical gear pair 11 is arranged. The extrusion gear pair 12, the second main body part 142, and the transmission element 15 are located on the same side of the first main body part 141, wherein the return element 17 is arranged between the second main body part 142 and the transmission element 15.

[0045] In the present embodiment, the first main body part 141 is generally a plate-like structure with a certain thickness, the central portion of the first main body part 141 being provided with the receiving cavity 1410, and the shape of the receiving cavity 1410 generally corresponding to the helical gear pair 11, and at least a part of the receiving cavity 1410 being provided through the first main body part 141 so that the output shaft 162 of the drive element 16 can penetrate the first main body part 141, extend to a region in which the helical gear pair 11 is located, and be frictionally connected thereto.It is understood that the bracket 14 can be used for the positioning connection of the helical gear pair 11, the drive member 16 and the transmission member 15, and the receiving cavity 1410 can achieve the positioning while reducing the weight and improving the space utilization efficiency.

[0046] In the present embodiment, the second main body part 142 is substantially in the shape of a strip, and the second main body part 142 is arranged on a side edge of the first main body part 141. The second main body part 142 protrudes relative to the first main body part 141 to cooperate with the transmission element 15, so that the return element 17 can be clamped between the second main body part 142 and the transmission element 15.One end of the return member 17 is held against the second main body part 142, which is fixedly arranged with respect to the first main body part 141, and the other end is held against the transmission member 15, which can be arranged movably with respect to the first main body part 141, so that a force of the return member 17 can act on the transmission member 15, and the transmission member 15 tends to drive the extrusion gear pair 12 to clamp the consumable. It is understood that the return member 17 may be an elastic structure such as a spring or an elastic rubber rod, and the return member 17 is illustrated as an example of a spring in the present embodiment, and the two ends of the return member 17 can be adjusted according to the drive member 15 and the recessed holes 1420 on the second main body part 142 to improve its precision and reliability.

[0047] In one embodiment, the first end portion 151 is rotatably connected to the first main body part 141, with the second end portion 152 and the second main body part 142 spaced apart from one another. The return element 17 is arranged between the second end portion 152 and the second main body part 142, with the return element 17 being arranged on a side of the extrusion wheel pair 12 connected to the transmission element 15, facing away from the first end portion 151.

[0048] In the present embodiment, the transmission element 15 has substantially the shape of a strip with a certain thickness, and two opposite ends of the strip-shaped transmission element 15 are respectively the first end portion 151 and the second end portion 152.The first end portion 151 is rotatably connected to the first main body part 141 by means of a structure such as a bolt (not shown) or a rotary shaft (not shown) to enable the transmission member 15 to rotate with respect to the first main body part 141; the second end portion 152 is disposed away from the first end portion 151 and bent toward a side of the second main body part 142 to facilitate an operator applying a force to the second end portion 152, thereby causing the transmission member 15 to rotate and compressing the return member 17, thus moving the transmission gear pair away from each other.

[0049] In one embodiment, the transmission element 15 further comprises a mounting portion 153 arranged between the first end portion 151 and the second end portion 152. The mounting portion 153 comprises a first connecting plate 1531 and a second connecting plate 1532 spaced apart from each other, wherein the mounting portion 153 is provided with a through hole 1533 penetrating the first connecting plate 1531 and the second connecting plate 1532. The second extrusion wheel 122 in the extrusion wheel pair 12 is arranged between the first connecting plate 1531 and the second connecting plate 1532, wherein a third transmission shaft body 133 passes successively through the first connecting plate 1531, the second extrusion wheel 122, and the second connecting plate 1532 to fasten the second extrusion wheel 122 to the mounting portion 153.

[0050] In the present embodiment, the second extrusion wheel 122 is arranged between the first connecting plate 1531 and the second connecting plate 1532 and is connected to the transmission member 15 via the third transmission shaft body 133, whereby a close connection between the second extrusion wheel 122 and the transmission member 15 can be achieved and the rotation of the second extrusion wheel 122 is not affected.

[0051] It is understood that the transmission element 15 attached to the main body part is capable of rotating about the anchor point of the connection between the first end portion 151 and the first main body part 141 as an axis, wherein the return element 17 is located on a side of the second extrusion wheel 122 facing away from the first end portion 151, and wherein the second end portion 152 is further located on a side of the return element 17 facing away from the first end portion 151.Therefore, the force arm from the return member 17 to the first end portion 151 is shorter than the force arm from the second end portion 152 to the first end portion 151, and the force exerted by the return member 17 on the transmission member 15 to drive the second extrusion wheel 122 to move closer to the first extrusion wheel 121 in the extrusion wheel pair 12 and clamp the consumable is amplified by the principle of leverage to improve the stability and reliability of extrusion of the extrusion mechanism 10.Similarly, the force arm from the second end portion 152 to the first end portion 151 is longer than the force arm from the return member 17 to the first end portion 151, and the second end portion 152 is moved, so that the force with which the transmission member 15 compresses the return member 17 is amplified by the principle of leverage, which makes it easier for an operator to move the transmission member 15, thereby improving the usability of the extrusion mechanism 10 under the premise of ensuring the stability and reliability of the extrusion mechanism 10.

[0052] In combination with Fig.8, the embodiment of the present application further provides a 3D printing apparatus 1 comprising a forming platform 18, a drive assembly 19, and an extrusion mechanism 10 in any of the preceding embodiments, wherein the drive assembly 19 drives the extrusion mechanism 10 to move relative to the forming platform 18.

[0053] Specific embodiments of the present application are described above with reference to the accompanying drawings. However, one of ordinary skill in the art will understand that various changes and substitutions can be made to the specific embodiments of the present application without departing from the spirit and scope of the present application. These changes and substitutions are within the scope of the present application.

Claims

[1] Extrusion mechanism used to extrude a consumable material, characterized by that the extrusion mechanism includes: a helical gear pair, wherein one helical gear of the helical gear pair is connected to a torque output end of the extrusion mechanism, and wherein the other helical gear of the helical gear pair is engaged with the other helical gear via a helical tooth; an extrusion gear pair, wherein the other helical gear of the helical gear pair is drivingly connected to an extrusion gear of the extrusion gear pair, and wherein the extrusion gear pair is used for clamping and extruding the consumable material; and a transmission element connected to the other extrusion wheel of the extrusion wheel pair for adjusting the clamping state of the extrusion wheel pair to the consumable. [2] Extrusion mechanism according to claim 1, characterized byin that the helical gear pair comprises a first transmission gear and a second transmission gear, wherein the first transmission gear is frictionally connected to a torque output end of the extrusion mechanism, and wherein the second transmission gear is in engagement with the first transmission gear, and wherein the extrusion gear pair comprises a first extrusion gear and a second extrusion gear, and wherein the first extrusion gear is drivingly connected to the second transmission gear, and wherein the second extrusion gear is connected to the transmission element, and wherein the first extrusion gear and the second extrusion gear are spaced apart from one another and cooperate to clamp and extrude the consumable material. [3] Extrusion mechanism according to claim 2, characterized bythat the extrusion mechanism further comprises a third transmission gear and a fourth transmission gear, wherein the third transmission gear is drivingly connected to the second transmission gear, and wherein the fourth transmission gear is drivingly connected to the first extrusion gear, and wherein the third transmission gear is in engagement with the fourth transmission gear. [4] Extrusion mechanism according to claim 3, characterized by that the third transmission gear and the second transmission gear are coaxially arranged and synchronously rotated by a first transmission shaft body, wherein the fourth transmission gear and the first extrusion gear are coaxially arranged and synchronously rotated by a second transmission shaft body. [5] Extrusion mechanism according to claim 3, characterized bythat the extrusion mechanism further comprises a drive element which is the torque output end of the extrusion mechanism, wherein the first transmission gear is drivingly connected to the drive element, and wherein the first transmission gear and the second transmission gear are arranged side by side, and wherein the third transmission gear is arranged on a side of the second transmission gear facing away from the drive element, and wherein the third transmission gear and the fourth transmission gear are arranged side by side. [6] Extrusion mechanism according to claim 1, characterized byin that the extrusion wheel pair comprises a first end portion and a second end portion that are spaced apart from each other, wherein the other extrusion wheel of the extrusion wheel pair and the transmission element are connected to each other between the first end portion and the second end portion; and wherein the extrusion mechanism further comprises a bracket movably connected to the first end portion so that the transmission element can be rotated with respect to the bracket; and wherein the extrusion mechanism further comprises a return element arranged between the bracket and the transmission element and serving to enable the transmission element to drive the extrusion wheel pair to clamp the consumable material, wherein the force arm from the return element to the first end portion is shorter than the force arm from the second end portion to the first end portion. [7] Extrusion mechanism according to claim 6, characterized by that the holder comprises a first main body part and a second main body part, wherein the second main body part is arranged on one side of the first main body part and is connected to the first main body part, and wherein a receiving cavity is provided on the first main body part, in which the helical gear pair is arranged, and wherein the extrusion gear pair, the second main body part and the transmission element are located on the same side of the first main body part, and wherein the return element is arranged between the second main body part and the transmission element. [8] Extrusion mechanism according to claim 7, characterized byin that the first end portion is rotatably connected to the first main body part, wherein the second end portion and the second main body part are spaced apart from one another, and wherein the return element is arranged between the second end portion and the second main body part, and wherein the return element is arranged on a side of the extrusion wheel pair connected to the transmission element facing away from the first end portion. [9] Extrusion mechanism according to claim 6, characterized bythat the transmission element further comprises a mounting portion arranged between the first end portion and the second end portion, wherein the mounting portion comprises a first connecting plate and a second connecting plate which are spaced apart from each other, and wherein the mounting portion is provided with a through hole penetrating the first connecting plate and the second connecting plate, and wherein the other extrusion wheel of the extrusion wheel pair is arranged between the first connecting plate and the second connecting plate and is rotatably connected to the transmission element via a third transmission shaft. [10] 3D printing device, characterized by in that it comprises a forming platform, a drive assembly and an extrusion mechanism according to any one of claims 1 to 9, wherein the drive assembly drives the extrusion mechanism to move relative to the forming platform.

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