CN116834273A - Pushing mechanism of miniature worm wheel extruder special for three-dimensional printer - Google Patents
Pushing mechanism of miniature worm wheel extruder special for three-dimensional printer Download PDFInfo
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- CN116834273A CN116834273A CN202110921975.8A CN202110921975A CN116834273A CN 116834273 A CN116834273 A CN 116834273A CN 202110921975 A CN202110921975 A CN 202110921975A CN 116834273 A CN116834273 A CN 116834273A
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- pushing
- rotating shaft
- gears
- tubular rotating
- driving turbine
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
- B29C64/118—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using filamentary material being melted, e.g. fused deposition modelling [FDM]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/227—Driving means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/307—Handling of material to be used in additive manufacturing
- B29C64/321—Feeding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
Abstract
A pushing mechanism of a miniature worm wheel extruder special for a three-dimensional printer belongs to the technical field of machinery. The structure comprises: a pushing motor with a tubular rotating shaft, a pushing gear, a supporting member and a driving turbine; the driving turbine drives 2 supported pushing gears at the same time, the axes of the 2 pushing gears are parallel to each other and perpendicular to the axis of the tubular rotating shaft, the two swing arms carrying the pushing gears are placed on two sides of the axis, the swing arms can rotate around the swing shafts, the swing shafts are fixed shafts, the shaft direction of the swing shafts is perpendicular to the axis of the tubular rotating shaft, the swing shafts just penetrate through the meshing area of the pushing gears and the driving turbine, after penetrating through the tubular rotating shaft of the pushing motor, the material wire is clamped by the 2 pushing gears, and when the tubular rotating shaft rotates clockwise or anticlockwise to drive the driving turbine, the pushing gears are simultaneously driven, so that the material wire can displace along the axial direction; ejecting from a heated nozzle of an extrusion nozzle; is widely applied to the manufacture of small and simple FDM-3D printers.
Description
[ field of the invention ]
The invention belongs to the technical field of machinery; specifically a pushing mechanism component used on an FDM-3D printing (material wire) extruder.
[ background Art ]
The most mature 3D printing technology is: the fused deposition modeling (Fused Deposition Modeling, FDM) rapid modeling technology is a method for heating and melting various wires (such as engineering plastics ABS, polycarbonate PC, etc.) and further accumulating and shaping layer by layer, which is called FDM for short. Most FDM rapid prototyping techniques can employ a wide variety of modeling materials, such as modified paraffins, (acrylonitrile/butadiene/styrene) copolymers (ABS), nylon, rubber, and other thermoplastic materials, as well as multiphase blends, such as metal powders, ceramic powders, staple fibers, and other blends with thermoplastic materials. Wherein PLA (polylactic acid) has the advantages of lower shrinkage, easier shaping of a printing model, biodegradability and the like.
The basic construction and operation principle of the FDM-3D printer are expressed as follows:
the extruder comprises a feeding mechanism and a melt extrusion nozzle part; a mechanical stage for carrying 2-dimensional or 3-dimensional (horizontal X-axis Y-axis movement and vertical Z-axis driving) movement of the extruder (extrusion nozzle part), or the vertical direction of the extruder (Z-axis direction) is kept stationary, and the movement in the Z-axis direction is completed by lifting and lowering an independent carrying workbench; the 3-dimensional mechanical system addressed by the driving extruder of the current FDM-3D printer is divided into: a mechanical arm 3-dimensional displacement system, a belt or screw-driven (X, Y-axis) 2-dimensional mechanical transmission + (Z-axis) lifting carrying workbench system, a vertical 3-screw-driven (commonly called as off-mode) displacement driving system which is connected with an extruder platform by using a connecting rod, and the like. Also structural shells, etc. that hold the above-described kinematic construction; there are also electronic control systems that support the movement of the mechanical system, etc.
It should be noted that: the extruder (2 major components) comprises: a feed mechanism and a melt extrusion die section, which may be closely assembled together (known as a short-feed extruder); the feeding mechanism and the melt extrusion nozzle part can be assembled separately and connected by using a material guide hose, so that the feeding mechanism can be fixed on a certain part of the printer shell in a static way, and the melt extrusion nozzle part is carried by a mechanical carrier with 2-dimensional or 3-dimensional motion (called as a remote feeding extruder, one of the purposes is to lighten the inertia mass of the motion carrying mechanism); but the remote pushing has a certain influence on the extrusion capacity, which is due to the elasticity and resistance of the guiding hose.
The prior art has the following defects: for the extruder of the FDM-3D printer, a motor pushing mechanism without a speed reduction design is often used for directly driving a material wire by utilizing tangential thrust of a gear on a motor shaft; the motor can not rotate relatively fast, the mechanical efficiency is low, and the volume and the weight are large.
The overall working principle of the FDM-3D printer is as follows: under the control of an electronic system, the extruder moves in an X-Y plane according to the section profile information of the product parts, the height of a carrying workbench is adjusted, the workbench plane is positioned at the nozzle position of a hot melting nozzle at the beginning of printing, thermoplastic thread-like materials are sent to the hot melting nozzle by a thread supplying mechanism, heated and melted into a semi-liquid state in the nozzle and then extruded out, selectively coated on the workbench, and a layer of sheet profile with the thickness of about 0.1-8 mm is formed after rapid cooling. And after the forming of one layer of section is finished, the workbench is lowered by a certain height, and then the cladding of the next layer is carried out, so that the section and the outline are 'drawn' layer by layer, and the cycle is carried out, and finally, the three-dimensional product part is formed. Often 1 special nozzle is used to lay the support material (the support material is generally water-soluble, and is washed away after printing is finished); in the printing process, the displacement of the printing head on the plane and the up-down displacement of the printing platform form a three-dimensional space, the printing head and the printing platform print according to the generated path, after the printing head finishes a printing task on the plane, the printing platform automatically descends one layer, the printing head continues to print, and the printing head is cycled until the finished product is finished. Or the Z-axis motor is not used for driving the printing object platform to lift, the printing object platform keeps static in the Z-axis direction, and the Z-axis motor is used for driving the extruder to move up and down; or 3 vertical screws are used for driving 3 sliding blocks which vertically move, the 3 sliding blocks are all hinged with the extruder, and the purpose of three-dimensional displacement addressing is achieved through an algorithm (the position coordinates of the 3 sliding blocks in the Z-axis direction determine the 3-dimensional space position of the extruder). The temperature of the printing head is higher, and the temperature of the printing head is relatively different according to the difference of materials and the design temperature of the model. In order to prevent the problems of edge curling of a printed object, the printing platform is generally heated, and the printing platform is generally covered with adhesive paper so as to facilitate the stripping of a printed finished product.
The structural details are described as follows:
the component of the extruder that is the core of the FDM rapid prototyping technique is the extruder, and the components of the extruder are: the plastic wires are extruded from the nozzle under the action of the pressure of a subsequent wire feeding (piston) and extruded onto a printing table, the throat in the extruder is made of stainless steel, the stainless steel throat is internally lined with teflon for reducing the heat conduction performance, the temperature in the throat is increased due to long-term heating printing of the extruder, the material in the throat is in a molten state, after the printing and cooling are stopped, the material is bonded in the throat, the adhesive in the pipe cannot be melted immediately when the printing is restarted next time, the choke plug phenomenon occurs in the throat, the material in the throat cannot be melted and adhered, and the problem can be greatly improved. Meanwhile, the cooling fin and the fan are additionally arranged on the extruder by the author, so that the temperature of the upper part of the throat pipe is reduced, the problem of choke plug is prevented, and the heat of the extruder can be dissipated. The heated and melted plastic filaments are extruded from the nozzle onto a printing table, and if the plastic is subjected to edge lifting, shrinkage and other adverse phenomena due to temperature rapid reduction, a hot bed printing table can be used to reduce the plastic is subjected to edge lifting, shrinkage and other adverse phenomena due to temperature rapid reduction. There are four general types of orifice diameters located at the lowest nozzle of an extruder: the jet nozzle with the maximum application range of 0.2mm,0.3mm,0.4mm and 0.5mm in the market is provided with a nozzle with the maximum application range of 0.4mm, and after the diameter of the nozzle is selected, corresponding parameters such as printing layer height, printing speed and the like in slice software are set in software during printing, so that the printing quality and precision are higher.
Compared with a single extrusion head, the double extrusion head adopts two extruders to be arranged in parallel, the printing speed is higher, the efficiency is higher, the inertia generated during operation is higher due to the larger mass, and the rigidity requirement on the guide rail is higher. This reduces the accuracy of printing. Compared with a single extrusion head, the double extrusion heads are arranged in parallel by adopting two extruders, and the relative positions are fixed, and as two spray heads are arranged on the sliding block, the double extrusion heads are connected with the guide rail by the sliding block, and the diameters of the spray nozzles at the lowest end of the extruders are of four types: the nozzles with the diameters of 0.2mm,0.3mm,0.4mm and 0.5mm are the most widely applied in the market, and of course, the nozzles with different diameters can be purchased according to actual needs, and it should be noted that after the diameters of the nozzles are selected, corresponding parameters, such as the printing layer height, the printing speed and the like in slice software, are set in software during printing, so that the quality and the precision of printing are higher.
The near-end wire feeding is to install the extruder on the printing head, the material is extruded into the throat directly by the gear, melted in the aluminum block and ejected out of the nozzle for printing. The mounting mode is characterized in that the extruder moves together with the printing head, the printing head has large mass, large inertia during printing, inaccurate printing is easy to cause, and the rigidity requirement of the guide rail by adopting the near-end wire feeding is higher. The far-end wire feeding is to install the extruder at a position far away from the extruder, the driving motor is generally installed on the printer frame, and the wire is fed by the guide pipe; rather than being mounted on an extruder, the distal wire feed requires a greater torque to extrude material into the printhead than the proximal wire feed.
Or the material used is no longer wire; the material may be powder, colloid or granular, and is one kind of feeding mechanism with ABS/PLA and other granular material, and through high temperature melting, liquid state and extrusion of 3D printed material under the control of pneumatic system.
The circuit part includes: the circuit part includes: the 3D printer circuitry portion functions in the printer to control the coordinated, orderly, complete operation of the entire printing process. A typical circuit part of the FDM type 3D printer mainly comprises an Arduino mega2560 main control board, a Ramps 1.4 expansion board and a stepping motor driving board. Their basic parameters and roles are described below. The micro controller of the Arduino Mega2560 main control board is atm ega2560, the working voltage is 5V, the number of digital I/O pins is 54, the number of analog input pins is 16, the direct current of each I/O pin is 50 milliamperes, the main control board is the brain of the 3D printer, and the main control board is responsible for controlling the whole printer to complete specific actions, such as printing specific files and the like. It should be noted here that the extended version of the diode supplying power to the main control board is not welded, that is, the mega2560 main control board is required to be supplied with power independently, and the USB 5V is directly used or the power is supplied through the power connector. Arduino is a convenient and flexible open source electronic prototype platform which is convenient to use, comprises hardware (Arduino plates of various types) and software (Arduino IDE), opens circuit diagram design of source codes, downloads program development interfaces for free, and can be modified according to personal needs, thereby meeting the needs of different people for creating creative ideas. Before the 3D printer operates, marlin firmware needs to be downloaded in an Arduino IDE, and partial parameters of the firmware need to be modified according to the needs to meet the printing requirements. The expansion board Ramps 1.4 is inserted on the main control board and is connected with the main control board through the contact pin, so that the expansion board Ramps are better connected and controlled with other hardware and play a role of a transition bridge. The expansion board needs to be connected with two 12V power supplies, one is 11A and supplies power to the heating bed, the other is 5A and supplies power to the extruder, the motors of each shaft, the fans and other elements, and the author does not use the heating bed, but only uses one 12V and 5A power supply. The fan output and the heating rod output indication LEDs are arranged on the Ramps 1.4 expansion board, the extruder and each shaft motor are controlled by the main control board through the stepping motor driving board A4988, and as the author adopts a single-head printer, the motor interface of the extruder 2 is not required to be provided with A4988, and the extruder is positioned at the upper right corner of the expansion board, and is provided with a X, Y, Z limit switch, so that the origin of each working time of the printer can be controlled. The A4988 stepping motor driving plate is used for being connected with a stepping motor, so that the control of the stepping motor by the main control board is realized, and the actions of the XYZ shaft motor and the extruder are realized. The A4988 stepper motor driving plate is characterized in that the driving plate has only a simple stepper and direction control interface and has 5 different stepper modes: the adjustable potentiometer can adjust the maximum current output to obtain higher stepping rate, and has the functions of overheat closing circuit, undervoltage locking and cross current protection, and the functions of grounding short-circuit protection and loading short-circuit protection. The driving board is connected to the corresponding interface in the expansion board through pins.
[ summary of the invention ]
The purpose of the invention is that: in order to solve the defects that the extruder of the 3D printing extruder is large in size, the working rotating speed (output matching performance) of a motor is not high, and the like.
The invention is characterized in that: simple structure, reliable operation, small volume and good motor power matching performance.
The technical key is as follows:
the miniature worm wheel extruder suitable for FDM-3D printing comprises a feeding mechanism and an extrusion nozzle: the feeding mechanism of the miniature worm wheel extruder comprises a pushing motor with a tubular rotating shaft, a pushing gear, a supporting member and a driving turbine; the extrusion nozzle comprises a heating aluminum block, a heating rod and a nozzle; basic assembly relationship: the supporting component supports the pushing motor and also supports the pushing gear, and meanwhile, the end part of the tubular rotating shaft of the pushing motor is provided with a driving turbine, and the axial lead of the driving turbine is overlapped with the axial lead of the tubular rotating shaft of the pushing motor; the driving turbine drives 2 pushing gears supported by the supporting component and the swinging arm at the same time, the axes of the 2 pushing gears (vortex teeth) are parallel to each other and are perpendicular to the axis of the tubular rotating shaft, the pushing gears are respectively placed on two sides of the axis (a gap area between the 2 gears and located on the axis of the tubular rotating shaft), the swinging arm carrying the pushing gears can rotate around the swinging shaft, the swinging shaft is a fixed shaft, the shaft direction of the swinging shaft is perpendicular to the axis of the tubular rotating shaft, and just passes through the meshing area of the pushing gears and the driving turbine (in this way, the distance between the 2 pushing gears is changed in the meshing state between the pushing gears and the driving turbine in the process of moving the swinging arm by external force and spring clamping force all the time), one end of the spring is fixed on the supporting component, a motor and other end of the spring is propped against the swinging arm, and the pushing gears on the swinging arm are close to the pushing gears arranged on the supporting component.
After passing through the tubular rotating shaft of the pushing motor, the material wire is clamped by 2 pushing gears, and when the tubular rotating shaft rotates clockwise or anticlockwise to drive the driving turbine, the pushing gears are simultaneously driven, so that the material wire can displace along the axial direction; under the remote feeding mode, the pushed material wire can be conveyed to the extrusion nozzle through a material guide hose locked by a material pipe locking nozzle, and is sprayed out from a heated nozzle of the extrusion nozzle; in the short-range feeding mode, the pushed material wire can directly enter the extrusion nozzle through a short pipeline (throat pipe) with poor heat conduction capability and is ejected from a heated nozzle of the extrusion nozzle.
The basic working process of using the lower extruder as a 3D printer extruder is as follows: after the heating rod is powered, the metal (heating aluminum block or copper block) structure body is heated, so that a melting cylinder (a space where the material wires are gathered) in the heating aluminum block generates high temperature; after the melting cylinder in the hot aluminum block is filled with molten materials by the material wires, the material wires enter into the melting cylinder and are extruded by the extrusion effect of the subsequent material wires, and the discharging process is carried out by the nozzle at the lower part;
further, the distance between the rotating shafts of the two pushing gears is fixed, the gap between the 2 gears is slightly smaller than the diameter of the wire (wire diameter: 1.75 mm, 3mm and the like), and the wire is pushed into the gap by strong force; or the carrier of at least one of the rotating shafts can move in a way of changing the wheelbase through the guide constraint of a straight line and a curve or the rotating shaft constraint of a fixed shaft and a movable shaft; it is also desirable to use springs to apply thrust and moment to the carrier of the movable shaft in a direction that forces the shaft distance of the two pusher gears to decrease.
The integral matching and assembling working relation with the FDM-3D printer mainly comprises a structural shell of the 3D printer, an electronic control system supporting the movement of a mechanical system, a mechanical carrying platform and a printing workbench under the constraint drive of X, Y, a Z-axis guide rail and a motor, wherein the carrying extruder performs planar movement, the extruder, a feeding mechanism or a storage box, the extruder is fixed on the mechanical carrying platform for carrying the extruder (the feeding mechanism of the miniature worm wheel extruder and an extrusion nozzle can be assembled at a close distance or at a long distance), and 3-dimensional relative movement is needed between the extruder (namely: the extruder remains stationary and the printing table performs a 3-dimensional motion; or the extruder keeps 1-dimensional motion and the printing workbench keeps the motion in 2-dimensional motion; or the extruder keeps 2-dimensional motion and the printing workbench keeps the motion in 1-dimensional motion; or the extruder is kept in 3-dimensional motion while the printing table is not moved; and the whole work is completed cooperatively.
The invention has the beneficial effects that:
the defects of large volume of the extruder, low motor rotation speed (efficiency) and the like of the 3D printing extruder are overcome; so that the whole volume of the extruder is reduced by more than 50 percent.
[ description of the drawings ]
Fig. 1 is a schematic view of the basic configuration of a micro worm gear extruder.
FIG. 2 is a schematic partial cross-sectional view of a micro worm gear extruder.
FIG. 3 is a schematic view of a partial cutaway disassembly of a micro worm gear extruder.
Fig. 4 is a schematic view of a micro worm gear extruder disassembled 1.
Fig. 5 is a schematic view of a micro worm gear extruder disassembled 2.
Description of the reference numerals:
(1) Pushing gear A
(2) Driving turbine
(3) Swing arm
(3-1) pendulum shaft
(3-2) Gear shaft A
(4) Tubular rotating shaft
(5) Support member
(5-1) Gear shaft B
(5-2) pendulum shaft hole
(6) Material pushing motor
(7) Material pipe locking nozzle
(8) Material guiding hose
(9) Material wire
(10) Spring piece
(11) An axis line
(12) Pushing gear B
(13) Extrusion nozzle
(13-1) nozzle
(13-2) heating the aluminum block
(14) Direction of spring force
[ example ]
The invention is further described with reference to the preferred embodiments in the following with reference to the accompanying drawings:
as shown in fig. 1, 2, 3, 4 and 5:
wherein fig. 1 and 2 are partially sectioned to see the interior, and fig. 4 and 5 show the basic assembly relationship.
As shown in fig. 1 and 2, the whole appearance of the micro worm wheel extruder comprises a feeding mechanism and a melt extrusion nozzle part; the extrusion nozzle (13) and the feeding mechanism can be rigidly connected by a short heat insulation throat pipe so as to move as a whole; the connection can also be made remotely using a guide hose (8) as in the figures, so that the extrusion nozzle (13) of smaller mass is easily pulled by the moving parts.
The pushing gear B (12) is constrained by a gear shaft B (5-1) fixed on the supporting member (5) to rotate in a fixed shaft mode, and the fixed shaft is perpendicular to the axis (11); the other pushing gear A (1) is arranged on a movable gear shaft A (3-2) of the swing arm (3), and the moving mode is that the swing arm (3) can rotate around a swing shaft (3-1) which is movably inserted into a swing shaft hole (3-3) on the swing arm (3); the elastic force of the spring piece (10) enables the rotation direction of the swing arm (3) to force the pushing gear A (1) and the pushing gear B (12) to approach each other.
The material wire (9) is clamped between the pushing gear A (1) and the pushing gear B (12), and the elastic force of the spring piece (10) enables the material wire to be clamped; the pushing motor (6) drives the end face driving turbine (2) with Archimedes spiral characteristics, the driving turbine (2) is provided with a middle hole communicated with the tubular rotating shaft (4) of the motor, and Archimedes spiral vortex teeth distributed on two sides of the middle hole simultaneously engage the pushing gear A (1) and the pushing gear B (12), so that the pushing gear A (1) and the pushing gear B (12) can simultaneously rotate along the opposite clockwise direction, and the effect of pushing wires is achieved.
The material pipe locking nozzle (7) shown in fig. 1 is used for locking a material guiding hose (8), and is connected with a heating aluminum block (13-2) (generally heated by an electric heating rod) in a flexible heat insulation way, so that the pushed material wire (9) is sprayed out of the nozzle (13-1) after being melted.
Claims (2)
1. The pushing mechanism of the miniature worm wheel extruder special for the three-dimensional printer comprises the following components: a pushing motor with a tubular rotating shaft, a pushing gear, a supporting member and a driving turbine; basic assembly relationship: the supporting component supports the pushing motor and also supports the pushing gear, and meanwhile, the end part of the tubular rotating shaft of the pushing motor is provided with a driving turbine, and the axial lead of the driving turbine is overlapped with the axial lead of the tubular rotating shaft of the pushing motor; the method is characterized in that: the driving turbine drives 2 supported pushing gears at the same time, the axes of the 2 pushing gears are parallel to each other and perpendicular to the axis of the tubular rotating shaft, the two swing arms carrying the pushing gears are placed on two sides of the axis, the swing arms can rotate around the swing shafts, the swing shafts are fixed shafts, the shaft direction of the swing shafts is perpendicular to the axis of the tubular rotating shaft, the swing shafts just penetrate through the meshing area of the pushing gears and the driving turbine, after penetrating through the tubular rotating shaft of the pushing motor, the material wire is clamped by the 2 pushing gears, and when the tubular rotating shaft rotates clockwise or anticlockwise to drive the driving turbine, the pushing gears are simultaneously driven, so that the material wire can displace along the axial direction; under the remote feeding mode, the pushed material wire can be conveyed to the extrusion nozzle through a material guide hose locked by a material pipe locking nozzle, and is sprayed out from a heated nozzle of the extrusion nozzle; in the short-range feeding mode, the pushed material wire can directly enter the extrusion nozzle through a short pipe with poor heat conduction capability and is ejected from a heated nozzle of the extrusion nozzle.
2. The invention relates to a pushing mechanism of a miniature worm wheel extruder special for a three-dimensional printer, which is characterized in that the distance between rotating shafts of two pushing gears is fixed, or a carrier of at least one rotating shaft can move in a manner of changing the wheelbase through linear and curved guiding constraint or fixed shaft and rotating shaft constraint; the spring is also required to apply thrust and moment to the supporting body of the movable rotating shaft, and the direction of the thrust forces the rotating shaft distance of the two pushing gears to be reduced; one specific structure comprises: one end of the spring is fixed on static parts such as the supporting component and the motor, and the other end of the spring is propped against the swing arm, so that the pushing gear on the swing arm is close to the pushing gear arranged on the supporting component.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011054317 | 2020-09-30 | ||
| CN2020110543175 | 2020-09-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116834273A true CN116834273A (en) | 2023-10-03 |
Family
ID=88165719
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110921975.8A Pending CN116834273A (en) | 2020-09-30 | 2021-08-12 | Pushing mechanism of miniature worm wheel extruder special for three-dimensional printer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116834273A (en) |
-
2021
- 2021-08-12 CN CN202110921975.8A patent/CN116834273A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 李铁军等: "轮机工程基础", vol. 1, 武汉理工大学出版社, pages: 363 - 299 * |
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