A short-range extrusion device and working method for implementing multi-color mixing

Abstract

The application discloses a kind of short-range extrusion device and working method for realizing multicolor mixing, solve the printing precision of prior art long-range feeding printing device, the movement precision of short-range feeding printing device is low, with the beneficial effect of improving printing precision, specific scheme is as follows: a kind of short-range extrusion device for realizing multicolor mixing, including driving module, feeding extrusion module, color mixing proportion control module and mixed extrusion module connected in sequence, power assembly is provided with multiple output shafts, each output shaft is respectively matched with corresponding feeding component, feeding extrusion module includes feeding fixed seat, feeding fixed seat supports tensioning mechanism, the clamping force between feeding component and tensioning mechanism is adjustable, multiple coaxial baffles are arranged between color mixing proportion control module and mixed extrusion module, the baffle is provided with the shielding groove that can be communicated with melt cavity, the baffle can be rotated so that the shielding groove shields part of melt cavity to realize flow regulation.

Description

Technical Field

[0001] This invention relates to the field of 3D printing technology, and in particular to a short-range extrusion device and its working method for achieving multi-color mixing. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] 3D printing, also known as additive manufacturing, is a manufacturing process that creates objects by layering materials. With technological advancements, 3D printing has evolved from its initial prototype manufacturing capabilities to producing functional components with complex structures, and is even used in fields such as biomedicine, architecture, and food. FDM (Fused Deposition Modeling) constructs objects by printing heated plastic filaments layer by layer, and is currently the most common desktop 3D printing technology.

[0004] Currently, consumer-grade FDM technology mainly focuses on monochrome printing. While this mode offers fast printing speeds, it only supports one color and cannot directly produce multiple colors, reducing the richness and playability of 3D printing. Multicolor printing, although capable of combining colors, is limited to a few fixed filament colors and doesn't produce colors beyond those filaments. With the popularization and development of FDM 3D printing technology, increasing market demand, and the promotion of customized and personalized products, FDM 3D printing needs a more efficient and flexible technology. Mixed-color printing can not only use the filament's inherent color but also create rich colors through mixing different filaments, meeting the market demands for artistic creation and personalized customization. However, multicolor mixed printing primarily relies on remote extrusion, which involves a long feeding distance and the filament has a certain degree of elasticity, resulting in poor extrusion accuracy. Near-field extrusion, on the other hand, uses multiple corresponding drive units at the near end—one drive unit for each extrusion nozzle—relying on different motor speeds to control the ratio. This results in a heavier print head with greater inertia, leading to poorer movement accuracy. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a short-range extrusion device for realizing multi-color mixing, thereby improving printing accuracy and overall movement accuracy.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0007] A short-range extrusion device for multi-color mixing includes a drive module, a feeding extrusion module, a color mixing ratio control module, and a mixing extrusion module connected in sequence. Multiple feeding holes are respectively arranged through the drive module, the feeding extrusion module, and the color mixing ratio control module. The drive module is equipped with a power component, and the power component is equipped with multiple output shafts. Each output shaft cooperates with a corresponding feeding component. The feeding extrusion module includes a feeding fixing seat, which supports a tensioning mechanism. The clamping force between the feeding component and the tensioning mechanism is adjustable to open or close the feeding holes. The color mixing ratio control module is equipped with a melting chamber. Multiple coaxially arranged baffles are arranged between the color mixing ratio control module and the mixing extrusion module. The baffles are equipped with blocking grooves that can communicate with the melting chamber. The baffles can be rotated so that the blocking grooves block part of the melting chamber to achieve flow regulation. The melting chamber can communicate with the mixing chamber in the mixing chamber. The mixing chamber is equipped with nozzles for extruding the mixed consumables.

[0008] In the short-range extrusion device for achieving multi-color mixing as described above, the feeding component and the baffle are spaced apart.

[0009] The drive module includes a bearing housing that can be fixed and rotatably supports the power component. The power component is a planetary gear system, in which the sun gear is the driving gear. One end of each planetary gear shaft is rotatably mounted on the feeding fixture. The number of planetary gear shafts in the planetary gear system is the same as the number of feeding holes. A worm gear is circumferentially fitted around each planetary gear shaft, and the worm gear cooperates with the feeding component, which is a feeding worm wheel.

[0010] As described above, in a short-range extrusion device for achieving multi-color mixing, the drive module further includes a cover plate. The power source of the sun gear is located at the cover plate and protrudes from the cover plate. The cover plate is connected to the bearing housing. Multiple pneumatic connectors are provided at the cover plate and are connected to the feed hole. The cover plate can be fixed. A gear ring bearing is provided at the bearing housing, and the planetary gear system is provided inside the gear ring bearing.

[0011] As described above, in a short-range extrusion device for achieving multi-color mixing, the tensioning mechanism includes a pulley seat, which is mounted on the feeding fixed seat. An eccentric wheel is provided on one side of the pulley seat, and the eccentric wheel is connected to a first power source. The pulley seat is equipped with a pulley bracket and a pulley shaft, and a spring is provided between the pulley shaft and the pulley seat. The circumferential surface of the eccentric wheel can contact the pulley bracket.

[0012] As described above, a short-range extrusion device for achieving multi-color mixing includes two L-shaped seats, with a support plate on one side of each L-shaped seat. The support plate supports the eccentric wheel, which is fixed to the output end of the first power source. Arc-shaped grooves are provided on the inner sidewalls of the L-shaped seats, and the eccentric wheel contacts the arc-shaped grooves.

[0013] The pulley bracket is a U-shaped structure. Spring positioning grooves are provided at both ends of the pulley shaft. The spring positioning grooves and the positioning grooves in the pulley seat fix the springs. The springs are positioned away from the eccentric wheel.

[0014] As described above, in a short-range extrusion device for achieving multi-color mixing, a support column is provided between the drive module and the feeding station, the planetary gear shaft passes through the center of the support column, and the support column has multiple recesses on one side facing the feeding station to accommodate a tensioning mechanism.

[0015] As described above, a short-range extrusion device for achieving multi-color mixing includes a color mixing ratio control module comprising a main cavity connected to the feeding fixed seat. The main cavity is divided into a heat insulation zone and a heating and color mixing ratio control zone by a partition arranged along a radial plane inside the main cavity. Both ends of the main cavity are open. A heat insulation block is installed in the heat insulation zone, and a heating block is installed in the heating and color mixing ratio control zone. Below the heating block are baffles arranged along the axial direction, and the melting chamber is placed in the heating block.

[0016] As described above, a short-range extrusion device for achieving multi-color mixing includes a baffle plate, a baffle limiting plate on the upper side of the middle plate, a lower cover plate on the lower side of the middle plate, a limiting groove on the periphery of the baffle limiting plate, and a toothed segment on the periphery of the middle plate. The toothed segment passes through the limiting groove and engages with a gear. The gear is fixed to the output end of a second power source, and the second power source is fixed to the side of the main cavity.

[0017] As described above, in a short-range extrusion device for achieving multi-color mixing, a baffle rotating shaft is centrally located in the color mixing ratio control module. The baffle rotating shaft passes through the baffle limiting plate and the lower cover plate. Multiple openings are provided on the sides of the baffle limiting plate and the lower cover plate. An elongated hole is provided in the middle plate corresponding to the opening position. A blocking semicircular plate is provided in one of the elongated holes to form a blocking groove. The volume of the blocking groove is smaller than the volume of the elongated hole, and the diameter of the blocking semicircular plate in the blocking groove is the same as that of the openings in the baffle limiting plate and the lower cover plate. A plane bearing is provided at the center hole of the middle plate, and the plane bearing is sleeved on the baffle rotating shaft.

[0018] Secondly, the present invention also provides a method for operating a short-range extrusion device for achieving multi-color mixing, comprising the following:

[0019] Consumables enter the feeding holes of the drive module, feeding extrusion module, and color mixing ratio control module. The clamping force between the feeding component and the tensioning mechanism is adjustable to open or close the feeding holes, so as to feed through all or part of the feeding holes.

[0020] The consumable material enters the melting chamber through the feeding hole and then enters the mixing chamber through the baffle groove. After being mixed in the mixing chamber, the consumable material is extruded through the nozzle. The baffle can rotate so that the baffle groove blocks part of the melting chamber to achieve flow regulation. That is, the flow rate is regulated by adjusting the outlet area of ​​the feeding hole through the rotation of the baffle.

[0021] The beneficial effects of the present invention are as follows:

[0022] 1) The short-range extrusion device of this invention has a reasonable structure. A feeding component and a tensioning mechanism are set at the feeding hole. The clamping force between the feeding component and the tensioning mechanism is adjustable to open or close the feeding hole. The power component cooperates with the corresponding feeding component through multiple output shafts. Instead of setting a separate power component at each feeding hole, the overall structural mass is effectively reduced, and short-range printing is achieved, which helps to ensure the overall movement accuracy and printing accuracy. Furthermore, the connection area between the melting chamber and the mixing chamber is changed by the rotation of the baffle, thereby changing the proportion of different colored molten consumables entering the mixing chamber, realizing real-time adjustment of the proportion of five-color consumables under different mixed colors.

[0023] 2) The power component is reasonably set in this invention. The power component adopts a planetary gear system. In the planetary gear system, the sun gear is the driving gear. One end of the planetary gear shaft is fixed but can rotate. The planetary gear shaft is circumferentially fitted with a worm. The worm cooperates with the feeding worm wheel. The tensioning mechanism can adjust the tension between its pulley and the feeding worm wheel to open or close the feeding hole.

[0024] 3) In this invention, the worm rotates with the planetary gear shaft and drives the feeding worm wheel. Due to the cooperation between the pulley and the feeding worm wheel, the consumable can be clamped and thus extruded. The rotation of the eccentric wheel and the compression of the spring can make the pulley support move back and forth, thereby driving the pulley shaft to move in the tension zone, realizing the adjustment of the clamping force between the pulley and the feeding worm wheel, thereby realizing the sealing or opening of the feeding hole.

[0025] 4) In this invention, the color mixing ratio control module is reasonably set up. The main cavity is equipped with a partition along the radial plane to divide it into a heat insulation zone and a heating and color mixing ratio control zone. The heat insulation block prevents the consumables from melting in advance and speeds up the heating of the consumables. The baffle structure is reasonably set up. The setting of the rotatable middle plate can effectively block the openings of the baffle limit plate and the lower cover plate. Attached Figure Description

[0026] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0027] Figure 1 This is a schematic diagram of a short-range extrusion device for achieving multicolor mixing according to one or more embodiments of the present invention.

[0028] Figure 2 This is an exploded view of a short-range extrusion apparatus for achieving multicolor mixing according to one or more embodiments of the present invention.

[0029] Figure 3 This is a schematic diagram of a drive module in a short-range extrusion device for achieving multicolor mixing according to one or more embodiments of the present invention.

[0030] Figure 4 This is an exploded view of the feeding extrusion module in a short-range extrusion device for achieving multicolor mixing according to one or more embodiments of the present invention.

[0031] Figure 5 This is an exploded view of a color mixing ratio control module in a short-range extrusion device for achieving multi-color mixing according to one or more embodiments of the present invention.

[0032] Figure 6 This is an exploded view of the tensioning mechanism in a short-range extrusion apparatus for achieving multicolor mixing according to one or more embodiments of the present invention.

[0033] Figure 7 This is an exploded view of the structure of a single baffle in a short-range extrusion device for achieving multicolor mixing according to one or more embodiments of the present invention.

[0034] Figure 8 This is a schematic diagram of the overall internal structure of a short-range extrusion device for achieving multi-color mixing according to one or more embodiments of the present invention.

[0035] Figure 9 This is a schematic diagram of the bearing housing in a short-range extrusion device for achieving multicolor mixing according to one or more embodiments of the present invention.

[0036] Figure 10 This is a schematic diagram of a feeding fixture in a short-range extrusion device for achieving multicolor mixing according to one or more embodiments of the present invention.

[0037] Figure 11 This is a schematic diagram of the internal structure of the main cavity in a short-range extrusion device for achieving multicolor mixing according to one or more embodiments of the present invention.

[0038] Figure 12 This is a diagram showing the state of the tensioning mechanism pulley when it is tensioned in a short-range extrusion device for achieving multicolor mixing according to one or more embodiments of the present invention.

[0039] Figure 13 This is a diagram showing the state of the tensioning mechanism pulley when it is relaxed in a short-range extrusion device for achieving multicolor mixing according to one or more embodiments of the present invention.

[0040] The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only.

[0041] The components include: 1. Drive module, 2. Feeding and extrusion module, 3. Color mixing ratio control module, and 4. Mixing and extrusion module.

[0042] 1-1. Stepper motor; 1-2. Pneumatic connector; 1-3. Cover plate; 1-4. Bearing housing; 1-5. Axial fixed bearing for planetary gear shaft; 1-6. Gear ring bearing; 1-7. Planetary gear train;

[0043] 1-3-1. Pneumatic connector mounting hole; 1-3-2. First screw fixing hole;

[0044] 1-4-1. Gear ring bearing mounting base; 1-4-2. First bearing mounting hole; 1-4-3. First feed hole; 1-4-4. Second screw fixing hole;

[0045] 1-7-1. Gear ring, 1-7-2. Sun gear, 1-7-3. Planetary gear shaft, 1-7-4. Retaining ring;

[0046] 2-1. Worm gear; 2-2. Feed worm wheel; 2-3. Support column; 2-3-1. Third screw fixing hole; 2-4. Tensioning mechanism; 2-5. Feed fixing seat;

[0047] 2-4-1. Upper cover plate of pulley seat; 2-4-2. Pulley bracket; 2-4-3. Pulley shaft; 2-4-4. Pulley; 2-4-5. Spring; 2-4-6. Pulley seat; 2-4-7. Eccentric wheel; 2-4-8. First micro motor;

[0048] 2-5-1. Tensioning mechanism mounting base; 2-5-2. Feeding worm gear bracket; 2-5-3. Second bearing mounting hole; 2-5-4. Third feeding hole; 2-5-5. Second groove; 2-5-6. Fourth screw fixing hole;

[0049] 3-1. Main cavity; 3-2. Heat insulation block; 3-3. Heating block; 3-4. Baffle; 3-5. Second micro motor; 3-6. Gear; 3-7. Axial fixed bearing for baffle rotation shaft; 3-8. Baffle rotation shaft;

[0050] 3-1-1. Insulation zone; 3-1-2. Heating and color mixing ratio control zone; 3-1-3. Micro motor mounting base; 3-1-4. Fifth feeding hole; 3-1-5. Fifth screw fixing hole; 3-1-6. Third bearing mounting hole; 3-1-7. Partition plate;

[0051] 3-3-1. Melting cavity;

[0052] 3-4-1. Baffle limiting plate; 3-4-1-1. Limiting groove; 3-4-2. Surface bearing; 3-4-3. Intermediate plate; 3-4-3-1. Covering groove; 3-4-3-2. Gear segment; 3-4-4. Lower cover plate;

[0053] 4-1. Mixing chamber; 4-2. Nozzle;

[0054] 4-1-1. Feed inlet, 4-1-2. Mixing chamber, 4-1-3. Sixth screw fixing hole, 4-2-1. Extrusion port. Detailed Implementation

[0055] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0056] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0057] As described in the background section, existing technologies suffer from low printing accuracy in remote feeding printing devices and low movement accuracy in short-range feeding printing devices. To address these technical problems, this invention proposes a short-range extrusion device for achieving multi-color mixing.

[0058] Example 1

[0059] In a typical embodiment of the present invention, reference is made to Figure 1 and Figure 2 As shown, a short-range extrusion device for multi-color mixing includes a drive module 1, a feeding extrusion module 2, a color mixing ratio control module 3, and a mixing extrusion module 4 arranged sequentially. The whole assembly is cylindrical. Each module is coaxially arranged with the cylindrical axis as the reference axis. Multiple feeding holes are set through the drive module 1, the feeding extrusion module 2, and the color mixing ratio control module 3 respectively. Specifically, five feeding holes can be set to realize the separate feeding of five kinds of consumables. The drive module is equipped with a power component, and the actuation component includes a stepper motor 1-1 and a planetary gear system.

[0060] refer to Figure 3 and Figure 4As shown, stepper motor 1-1 is fixed on cover plate 1-3. Pneumatic connector 1-2 is connected to cover plate 1-3. Multiple pneumatic connectors 1-2 are provided. Pneumatic connector 1-2 is used to connect to the feeding device to feed consumables into the feeding hole. Cover plate 1-3 is connected to the bearing housing 1-4 below it. Planetary gear train 1-7 is composed of gear ring 1-7-1, sun gear 1-7-2, planetary gear shaft 1-7-3, and retaining ring 1-7-4 in a certain assembly relationship. Gear ring 1-7-1 is fixed in the inner ring of gear ring bearing 1-6, so that gear ring 1-7-1 can rotate relative to gear ring bearing 1-6. Gear ring bearing 1-6 is interference-fitted with gear ring bearing mounting seat 1-4-1 in bearing housing 1-4. Sun gear 1-7-2 is fixed to the motor shaft of stepper motor 1-1 through retaining rings 1-7-4 at both ends. -7-2 rotates, the position of planetary gear shaft 1-7-3 remains stationary but can rotate, the planetary gears at planetary gear shaft 1-7-3 drive the gear ring 1-7-1 to rotate, the bearing housing 1-4 and the feeding fixed seat 2-5 are evenly distributed with five axially fixed first bearing mounting holes 1-4-2 and second bearing mounting holes 2-5-3 in a circumferentially even distribution, which are used to install the planetary gear shaft axially fixed bearings 1-5 respectively. The planetary gear shaft axially fixed bearings 1-5 are arranged in pairs, and the axial fixation and circumferential even distribution of the planetary gear shaft 1-7-3 are achieved by the above two sets of relatively arranged bearings;

[0061] refer to Figure 9 As shown, the bearing housing 1-4 has a first bearing mounting hole 1-4-2 at its center. The bearing housing 1-4 has a gear ring bearing mounting seat 1-4-1 on the periphery of the multiple first bearing mounting holes 1-4-2 for mounting the gear ring bearing 1-6. The bearing housing 1-4 has multiple second screw fixing holes 1-4-4 and multiple first feeding holes 1-4-3.

[0062] For details, please refer to Figure 4 As shown, the worm 2-1 is mounted on the planetary gear shaft 1-7-3 by a pin. The length of the worm 2-1 is less than the length of the planetary gear shaft 1-7-3. The planetary gear shaft 1-7-3 is positioned through the center of the support column 2-3.

[0063] refer to Figure 4 and Figure 10As shown, the feeding fixing seat 2-5 is a circular structural component. The center of the feeding fixing seat 2-5 is provided with multiple second bearing mounting holes 2-5-3. The feeding fixing seat 2-5 is provided with feeding worm gear brackets 2-5-2 that are circumferentially distributed and correspond to the planetary gear shaft 1-7-3. The feeding worm gear brackets 2-5-2 are used to fix the feeding worm gear 2-2. The feeding worm gear 2-2 cooperates with the worm 2-1. Five tensioning mechanism mounting seats 2-5-1 are provided in the radial position of the feeding worm gear brackets 2-5-2 in the feeding fixing seat 2-5, which are evenly distributed in the circumference and are used to fix the tensioning mechanism 2-4. The positions of the tensioning mechanism mounting seats 2-5-1 and the feeding worm gear brackets 2-5-2 are one-to-one. The tensioning mechanism mounting seats 2-5-1 are placed on the outside of the feeding worm gear brackets 2-5-2.

[0064] Specifically, the tensioning mechanism mounting base 2-5-1 includes a first groove arranged in the feeding fixing base 2-5. The first groove is used to install the pulley seat 2-4-6 in the tensioning mechanism 2-4. A second groove 2-5-5 is also provided in the first groove. The second groove 2-5-5 is used to accommodate the first micro motor 2-4-8.

[0065] refer to Figure 4 As shown, there is a support column 2-3 between the bearing housing 1-4 and the feeding fixed seat 2-5. The support column 2-3 is connected to the bearing housing 1-4 to support the bearing housing 1-4. The support column 2-3 has multiple recesses on the side facing the feeding fixed seat 2-5, which accommodate the tensioning mechanism 2-4.

[0066] Specifically, the feeding worm gear bracket 2-5-2 includes a pair of support ears to support the feeding worm gear 2-2. Due to the cooperation between the feeding worm gear 2-2 and the worm 2-1, the position of the planetary gear shaft 1-7-3 remains stationary during the rotation of the planetary gear shaft 1-7-3. One end of the planetary gear shaft 1-7-3 is rotatably mounted on the feeding fixed seat 2-5, allowing the planetary gear shaft 1-7-3 to rotate, which in turn drives the rotation of the feeding worm gear 2-2 through the worm 2-1.

[0067] refer to Figure 5 and Figure 11As shown, the color mixing ratio control module 3 includes a main cavity 3-1, which is connected to the lower surface of the feeding fixed seat 2-5. The main cavity 3-1 is a cylindrical structure. Inside the main cavity 3-1, a partition 3-1-7 is arranged along the radial plane to divide it into a heat insulation zone 3-1-1 and a heating and color mixing ratio control zone 3-1-2. Both ends of the main cavity 3-1 are open. The heat insulation block 3-2 is installed in the heat insulation zone 3-1-1 of the main cavity 3-1, and the heating block 3-3 is installed in the heating and color mixing ratio control zone 3-1-2. Below the heating block 3-3, there are five baffles 3-4 arranged axially. The center of the partition 3-1-7 facing the heating and color mixing ratio control zone 3-1-2 is provided with a third bearing mounting hole 3-1-6 for axial fixing of the baffle rotating shaft 3-8. The baffle rotating shaft 3-8 is axially fixed to the bearing 3-7 installed at the third bearing mounting hole 3-1-6.

[0068] Specifically, the heat insulation block 3-2 is made of polytetrafluoroethylene and is placed on the upper part of the main cavity 3-1 to prevent the consumables from melting prematurely. The heating block 3-3 is equipped with a heating resistance wire and is placed in the middle of the main cavity 3-1 to heat the consumables to a molten state. The second micro motor 3-5 drives the gear 3-6 to rotate the baffle, which can change the area of ​​the flow channel outlet, thereby realizing the control of the flow rate of each channel and achieving different mixing ratios.

[0069] The outer surface of the main cavity 3-1 is provided with five micro motor mounting seats 3-1-3 evenly distributed circumferentially, corresponding to the feeding channel, for fixing the second micro motor 3-5. The motor shaft of the second micro motor 3-5 is provided with a gear 3-6 that meshes with a baffle 3-4; each baffle 3-4 has tooth segments 3-4-3-2 on its circumferential surface that mesh with the gear 3-6. (Refer to...) Figure 7 As shown, the tooth segments 3-4-3-2 at each baffle 3-4 mesh with the gear 3-6 of the corresponding second micro motor 3-5, and the tooth segments 3-4-3-2 of adjacent baffles are staggered at different angles.

[0070] refer to Figure 7As shown, each baffle 3-4 includes an intermediate plate 3-4-3. A baffle limiting plate 3-4-1 is provided on the upper side of the intermediate plate 3-4-3, and a lower cover plate 3-4-4 is provided on the lower side of the intermediate plate 3-4-3. A limiting groove 3-4-1-1 is provided on the periphery of the baffle limiting plate 3-4-1, and a toothed segment 3-4-3-2 is provided on the periphery of the intermediate plate 3-4-3, which protrudes from the limiting groove 3-4-1-1. The baffle limiting plate 3-4-1 and the lower cover plate 3-4-4 are respectively provided with multiple openings, which are circular holes for feeding. The baffle rotating shaft 3-8 is provided through the central hole of each layer of the baffle 3-4, and the opening is located on the periphery of the central hole. The openings of the baffle limiting plate 3-4-1 and the lower cover plate 3-4-4 are all circular holes. The intermediate plate 3-4-3... An elongated hole is provided at the location where the hole should be opened. One of the elongated holes is fitted with a shielding semicircular plate to form a shielding groove 3-4-3-1. The shielding semicircular plate in the shielding groove 3-4-3-1 has the same diameter as the opening of the baffle limiting plate 3-4-1 and the lower cover plate 3-4-4. The volume of the shielding groove 3-4-3-1 is smaller than the volume of the elongated hole. The shielding groove 3-4-3-1 is formed by removing the semicircle from one end of the elongated hole. A plane bearing 3-4-2 is provided at the center hole of the intermediate plate 3-4-3. The plane bearing 3-4-2 is fitted onto the baffle rotation shaft 3-8, so that the intermediate plate can rotate relative to the baffle limiting plate 3-4-1 and the lower cover plate 3-4-4. During the rotation, the intermediate plate closes the opening of the baffle limiting plate 3-4-1 and the lower cover plate 3-4-4.

[0071] In addition, a flange end is provided at one end of the main cavity 3-1 facing the feeding fixture 2-5 for fixed connection with the feeding fixture.

[0072] refer to Figure 8 As shown, a pneumatic connector mounting hole 1-3-1 connected to the pneumatic connector 1-2 is provided at the cover plate 1-3, a first feeding hole 1-4-3 is provided at the bearing seat 1-4, a second feeding hole is provided at the support column 2-3, a third feeding hole 2-5-4 is provided at the feeding fixing seat 2-5, a fourth feeding hole is provided at the heat insulation block 3-2, and a fifth feeding hole 3-1-4 is provided at the partition of the main cavity 3-1. All feeding holes are connected for feeding. A melting chamber 3-3-1 is provided at the heating block 3-3. The melting chamber 3-3-1 is connected to the shielding groove 3-4-3-1. The shielding groove 3-4-3-1 can be rotated to cut off the connection between the melting chamber 3-3-1 and the feed inlet 4-1-1.

[0073] At the end of the entire module is the mixing extrusion module 4, which includes a mixing chamber 4-1. The mixing chamber 4-1 is funnel-shaped and has a nozzle 4-2 for mixing consumables extrusion connected by a thread at the end of the mixing chamber 4-1. An extrusion port 4-2-1 is provided at the nozzle 4-2. The mixing chamber 4-1 is provided with a feed port 4-1-1 that communicates with the internal mixing chamber 4-1-2. The inner diameter of the vertical section in the mixing chamber 4-1 gradually decreases, and the inner diameter is the smallest at the nozzle. The mixing chamber 4-1 is connected to the lower end face of the main chamber 3-1 in the color mixing ratio control module 3.

[0074] It should be explained that the entire printhead module is fixed by the first screw fixing hole 1-3-2 at the cover plate, the second screw fixing hole 1-4-4 at the bearing seat 1-4, the third screw fixing hole 2-3-1 at the support column 2-3, the fourth screw fixing hole 2-5-6 at the feed fixing seat, the fifth screw fixing hole 3-1-5 at the main cavity 3-1, and the sixth screw fixing hole 4-1-3 at the mixing cavity 4-1.

[0075] refer to Figure 6 and Figure 12 As shown, the tensioning mechanism 2-4 includes a pulley seat cover plate 2-4-1, a pulley bracket 2-4-2, a pulley shaft 2-4-3, a pulley 2-4-4, a spring 2-4-5, a pulley seat 2-4-6, an eccentric wheel 2-4-7, and a first micro motor 2-4-8. The first micro motor 2-4-8 is fixed on the pulley seat 2-4-6. The pulley seat 2-4-6 includes two L-shaped seats. A support plate is provided on one side, i.e., the rear end, of the two L-shaped seats. The support plate supports the eccentric wheel 2-4-7. The eccentric wheel 2-4-7 is fixed on the motor shaft of the first power source, such as the first micro motor. An arc-shaped recess is provided on the inner side of the L-shaped seat to provide space for the movement of the eccentric wheel. The pulley bracket 2-4-2 faces the eccentric wheel. An arc-shaped groove is provided on one side of the mandrel 2-4-7. The eccentric wheel 2-4-7 is inserted into the arc-shaped recess of the pulley bracket 2-4-2. The eccentric wheel 2-4-7 contacts the pulley bracket 2-4-2 so that the eccentric wheel 2-4-7 is always in contact with the pulley bracket 2-4-2 during the rotation of the eccentric wheel 2-4-7. The pulley bracket 2-4-2 is a U-shaped structure and is used to support the pulley 2-4-4. The open part of the pulley bracket 2-4-2 is used to install the pulley shaft 2-4-3 and the pulley 2-4-4. The other end of the pulley bracket 2-4-2 contacts the eccentric wheel 2-4-7. The diameter of the pulley 2-4-4 is smaller than the diameter of the feeding worm gear.

[0076] It is easy to understand that the L-shaped seat has a notch on the top side to support the end of the pulley shaft 2-4-3. The two ends of the pulley shaft 2-4-3 are provided with spring positioning grooves. The spring positioning grooves and the positioning grooves in the pulley seat 2-4-6 fix the spring 2-4-5. The two ends of the pulley shaft 2-4-3 are limited to the tension area in the pulley seat 2-4-6 by the installation of the upper cover plate 2-4-1 of the pulley seat. The bottom surface of the pulley seat 2-4-6 is provided with four mounting holes for installation on the feeding fixed seat 2-5, which can realize the cooperation between the pulley 2-4-4 and the feeding worm gear 2-2.

[0077] The rotation of the motor shaft drives the eccentric wheel 2-4-7 to rotate. Due to its contact with the pulley bracket 2-4-2, the pulley bracket 2-4-2 moves the pulley back and forth. Furthermore, the elastic force of the spring 2-4-5 changes the gap between the pulley 2-4-4 and the feeding worm gear 2-2, thereby adjusting the clamping force of the consumables. (Refer to...) Figure 12 and Figure 13 As shown, the working state of tensioning mechanism 2-4 is demonstrated using the two positions of eccentric wheel 2-4-7 as an example.

[0078] The short-range extrusion device disclosed in this embodiment has a reasonable structural design. A feeding component and a tensioning mechanism are set at the feeding hole. The clamping force between the feeding component and the tensioning mechanism 2-5 is adjustable to open or close the feeding hole. The power component cooperates with the corresponding feeding component through multiple output shafts. Instead of setting a separate power component at each feeding hole, the overall structural mass is effectively reduced, realizing the basis of short-range printing and helping to ensure the overall movement accuracy and printing accuracy. Furthermore, the connection area between the melting chamber 3-3-4 and the mixing chamber 4-1-2 is changed by rotating the baffle 3-4, thereby changing the proportion of different colored molten consumables entering the mixing chamber 4-1-2, realizing real-time adjustment of the proportion of five-color consumables under different mixed colors.

[0079] Example 2

[0080] This embodiment discloses a working method for a short-range extrusion device for achieving multi-color mixing, including the following:

[0081] Consumables enter the drive module 1 and the feeding extrusion module 2 through the feed hole. In the drive module 1, the power source distributes power to the five planetary gear shafts 1-7-3 through the planetary gear train 1-7 to realize the extrusion of consumables. In the feeding extrusion module, the clamping force between the feeding component and the tensioning mechanism 2-4 can be adjusted to control the opening or closing of the corresponding feeding passage to adapt to different color formulas. At the same time, the clamping force adjustment through the tensioning mechanism 2-4 can avoid problems such as material biting and unstable material pushing during the extrusion process.

[0082] Consumables enter the feeding holes of drive module 1, feeding extrusion module 2, and color mixing ratio control module 3. The clamping force between the feeding component and the tensioning mechanism 2-4 is adjustable to open or close the feeding holes so that the material can be fed through all or part of the feeding holes. The clamping force adjustment achieved by the tensioning mechanism 2-4 also avoids problems such as material biting or being unable to push the material.

[0083] The consumable material enters the melting chamber 3-3-1 through the feeding hole and then enters the mixing chamber 4-1 through the blocking groove 3-4-3-1 of the baffle. After being mixed in the mixing chamber 4-1, the consumable material is extruded through the nozzle. The middle plate 3-4-3 in the baffle can rotate so that the blocking groove 3-4-3-1 blocks part or all of the melting chamber 3-3-1 to achieve flow regulation. That is, the flow regulation is achieved by adjusting the outlet area of ​​the feeding hole by rotating the baffle 3-4.

[0084] Different color formulations require different color ratios, and not all formulations need to use all five base colors at the same time. Some only need two, three, or four of them to achieve the target color. By adjusting the corresponding tensioning mechanism 2-4, the clamping force between the feeding component and the pulley 2-4-4 in the tensioning mechanism 2-4 is kept at the set value, so as to achieve selective feeding of each feeding path: the path involved in color mixing is extruded and fed, and the path not involved in color mixing is stopped, so as to adapt to the needs of different color formulations.

[0085] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A short-range extrusion device for achieving multi-color mixing, characterized in that, The system includes a drive module, a feeding extrusion module, a color mixing ratio control module, and a mixing extrusion module connected in sequence. Multiple feeding holes are respectively set through the drive module, the feeding extrusion module, and the color mixing ratio control module. The drive module is equipped with a power component, and the power component is equipped with multiple output shafts. Each output shaft cooperates with a corresponding feeding component. The feeding extrusion module includes a feeding fixing seat, which supports a tensioning mechanism. The clamping force between the feeding component and the tensioning mechanism is adjustable to open or close the feeding holes. The color mixing ratio control module is equipped with a melting chamber. Multiple coaxially arranged baffles are set between the color mixing ratio control module and the mixing extrusion module. The baffles are equipped with blocking grooves that can communicate with the melting chamber. The baffles can be rotated so that the blocking grooves block part of the melting chamber to achieve flow regulation. The melting chamber can communicate with the mixing chamber in the mixing chamber. The mixing chamber is equipped with nozzles for extruding the mixed consumables. The distance between the feeding component and the baffle is set; the drive module includes a bearing seat, which can be fixed and rotatably supports the power component. The power component is a planetary gear system, in which the sun gear is the driving gear. One end of the planetary gear shaft in the planetary gear system is rotatably mounted on the feeding fixed seat. The number of planetary gear shafts in the planetary gear system is the same as the number of feeding holes. A worm gear is circumferentially sleeved on the planetary gear shaft, and the worm gear cooperates with the feeding component, which is a feeding worm wheel. The tensioning mechanism includes a pulley seat, which is installed on the feeding fixed seat. An eccentric wheel is provided on one side of the pulley seat. The eccentric wheel is connected to the first power source. The pulley seat is equipped with a pulley bracket and a pulley shaft. A spring is provided between the pulley shaft and the pulley seat. The circumferential surface of the eccentric wheel can contact the pulley bracket. The color mixing ratio control module includes a main cavity, which is connected to the feeding fixed seat. The main cavity is divided into a heat insulation zone and a heating and color mixing ratio control zone by a partition along the radial plane. Both ends of the main cavity are open. The heat insulation block is installed in the heat insulation zone, and the heating block is installed in the heating and color mixing ratio control zone. The baffle is arranged axially below the heating block, and the melting chamber is placed in the heating block. The baffle includes an intermediate plate, a baffle limiting plate is provided on the upper side of the intermediate plate, a lower cover plate is provided on the lower side of the intermediate plate, a limiting groove is provided on the periphery of the baffle limiting plate, and a toothed segment is provided on the periphery of the intermediate plate. The toothed segment passes through the limiting groove and engages with a gear. The gear is fixed to the output end of the second power source, and the second power source is fixed to the side of the main cavity.

2. The short-range extrusion device for achieving multi-color mixing according to claim 1, characterized in that, The drive module also includes a cover plate. The power source of the sun gear is located at the cover plate and protrudes from the cover plate. The cover plate is connected to the bearing housing. Multiple pneumatic connectors are provided at the cover plate. The pneumatic connectors are connected to the feed hole. The cover plate can be fixed. A gear ring bearing is provided at the bearing housing. The planetary gear system is provided inside the gear ring bearing.

3. The short-range extrusion device for achieving multi-color mixing according to claim 1, characterized in that, The pulley seat includes two L-shaped seats, and a support plate is provided on one side of the two L-shaped seats. The support plate supports the eccentric wheel, which is fixed to the output end of the first power source. Arc-shaped grooves are provided on the inner sidewalls of the L-shaped seats, and the eccentric wheel contacts the arc-shaped grooves. The pulley bracket is a U-shaped structure. Spring positioning grooves are provided at both ends of the pulley shaft. The spring positioning grooves and the positioning grooves in the pulley seat fix the springs. The springs are positioned away from the eccentric wheel.

4. The short-range extrusion device for achieving multi-color mixing according to claim 1, characterized in that, A support column is provided between the drive module and the feeding fixed seat. The planetary gear shaft passes through the center of the support column. The support column has multiple recesses on one side facing the feeding fixed seat to accommodate the tensioning mechanism.

5. A short-range extrusion device for achieving multi-color mixing according to claim 1, characterized in that, The color mixing ratio control module has a baffle rotating shaft at its center, which passes through the baffle limiting plate and the lower cover plate. The baffle limiting plate and the lower cover plate have multiple openings on their sides. The middle plate has an elongated hole at the position corresponding to the opening. A shielding semicircular plate is set in one of the elongated holes to form a shielding groove. The volume of the shielding groove is smaller than the volume of the elongated hole, and the diameter of the shielding semicircular plate in the shielding groove is the same as that of the openings in the baffle limiting plate and the lower cover plate. A plane bearing is set at the center hole of the middle plate and is fitted onto the baffle rotating shaft.

6. A method for operating a short-range extrusion apparatus for achieving multi-color mixing according to any one of claims 1-5, characterized in that, Includes the following: Consumables enter the feeding holes of the drive module, feeding extrusion module, and color mixing ratio control module. The clamping force between the feeding component and the tensioning mechanism is adjustable to open or block the feeding holes so that feeding can be carried out through all or part of the feeding holes. The consumable material enters the melting chamber through the feeding hole and then enters the mixing chamber through the baffle groove. After being mixed in the mixing chamber, the consumable material is extruded through the nozzle. The baffle can rotate so that the baffle groove blocks part of the melting chamber to achieve flow regulation.

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