CN106827443A - A kind of short carbon fiber reinforced high temperature glutinous thermoplastic rapid shaping screw extrusion apparatus high - Google Patents
A kind of short carbon fiber reinforced high temperature glutinous thermoplastic rapid shaping screw extrusion apparatus high Download PDFInfo
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- CN106827443A CN106827443A CN201611039419.3A CN201611039419A CN106827443A CN 106827443 A CN106827443 A CN 106827443A CN 201611039419 A CN201611039419 A CN 201611039419A CN 106827443 A CN106827443 A CN 106827443A
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- screw rod
- barrel
- thermocouple
- thermoplastic
- carbon fiber
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/625—Screws characterised by the ratio of the threaded length of the screw to its outside diameter [L/D ratio]
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/252—Drive or actuation means; Transmission means; Screw supporting means
- B29C48/2526—Direct drives or gear boxes
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/285—Feeding the extrusion material to the extruder
- B29C48/288—Feeding the extrusion material to the extruder in solid form, e.g. powder or granules
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
- B29C48/397—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using a single screw
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
- B29C48/82—Cooling
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
- B29C48/83—Heating or cooling the cylinders
- B29C48/832—Heating
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
- B29C48/84—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders by heating or cooling the feeding screws
- B29C48/845—Heating
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
- B29C48/84—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders by heating or cooling the feeding screws
- B29C48/85—Cooling
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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- 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
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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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
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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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/92885—Screw or gear
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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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/92895—Barrel or housing
Abstract
The invention discloses a kind of short carbon fiber reinforced high temperature glutinous thermoplastic rapid shaping screw extrusion apparatus high, include supporting plate, barrel, screw rod, extrusion die, actuating unit, install on the supporting plate the upper end of barrel, screw rod is placed in barrel, actuating unit is installed and is connected on the supporting plate and with screw drive, and actuating unit drives screw rod to rotate；Charging aperture is provided with the upper end side wall of barrel；The lower end connection extrusion die of barrel；Also include temperature control equipment, temperature control equipment includes and is arranged on the first heating collar on the outside of barrel on a circle, is arranged on the second heating collar for enclosing in extrusion die outside one, the first thermocouple being arranged on the wall of barrel side, the second thermocouple and temperature control box being arranged on extrusion die, heating collar, thermocouple are connected with temperature control box, and temperature control box controls the first heating collar and the heating of the second heating collar according to the real time temperature that the first thermocouple and the second thermocouple feed back.
Description
Technical field
The present invention relates to the rapid shaping extrusion device design field of special engineering plastics, and in particular to a kind of short carbon
Fiber reinforcement high temperature glutinous thermoplastic rapid shaping screw extrusion apparatus high.
Background technology
Fused glass pellet (FDM), according to plasticizing mode difference, can by fusion sediment nozzle type be divided into plunger type and
Screw.Plunger type fused glass pellet is a kind of most widely used 3D printing technique of existing market, is squeezed by exchangeable nozzle
Pressure layer by layer deposition material finally realizes the shaping of 3D structures.However, the description of materials that the forming method is applicable is limited, and mostly
It is the thermoplastic of low melting point so that the product mechanical property and heat resistance of final molding are limited, it is impossible to be applied to primary load bearing
The space environment of structural member and complexity.Therefore, it is necessary to study space applicability material and new moulding process to adapt to FDM skills
The primary load bearing part production of art, 3D printing forming technique of the exploitation suitable for space environment carbon fibre composite.
Carbon fiber is a kind of new material of excellent in mechanical performance, its proportion less than the 1/4 of steel, by carbon fiber and asphalt mixtures modified by epoxy resin
The composite that fat is combined into, a kind of advanced aerospace material is turned into because its proportion is small, rigidity good and intensity is high.
Although carbon fibre reinforced composite has many excellent characteristics, different carbon fiber-reinforced resin application fields have one
Fixed limitation, with PLA (PLA), the resin such as acrylonitrile-butadiene-styrene (ABS) (ABS) is used as carbon fibre composite
Reinforced resin, although increased in mechanical property performance, but for persistently being used under high/low temperature, radiation environment and high temperature
Performance is restricted, particularly with space environment, it is necessary to the good thermoplastic of good resistant of high or low temperature, heat endurance, creep resistance
Property resin-based materials, such as Short Carbon Fibre Reinforced PEEK polymer matrix composites, because with excellent endurance, rub resistance
Aerospace field can be widely used in excellent mechanical characteristic.
The resinoid base often has fusing point and viscosity very high, must be using adaptable moulding process.
In the prior art, Chinese patent (Patent publication No is CN1586865A) discloses a kind of spiral shell of thermoplastic
Bar extruding jet device, employs the three-stage extruding screw of 40Cr materials, by push rod groove between hopper and connection barrel
Reciprocal feeding, when heater uses cast copper heater, but this material screw rod to be heated for high-melting plastics, its fragility increases
Intensity declines fast, and extrusion high viscosity plastics need bigger moment of torsion, once screw diameter design is too small, high temperature it is high it is glutinous in the case of
Intensity is not enough, it is easy to be broken off, while cast copper heater firing rate is slow, it is difficult to be heated to 400 DEG C of high temperature, is adapted to eutectic
The heating of the plastics such as PLA, ABS of point.
Chinese patent (Patent publication No 104309122A) discloses a kind of 3D printing side of carbon fibre reinforced composite
Method and device, the device use LASER HEATING carbon fibre composite, laser to be divided into two, carried to laser head one and laser head two
For linear laser source, the width of linear laser can be according to printing supply head width adjusting, and the power of linear laser is according to printing material
The temperature and speed that material melting needs are adjusted, and the feeding speed of feed device will mutually be assisted with the intensity of LASER HEATING with the time
Adjust, fusing carbon fibre reinforced composite band makes silk material and print zone has bonded together, the method use laser as adding
Thermal source, using the carbon fiber silk material feeding for having prepared, for low-melting-point resin sill, can use the widely used plunger in market
Formula shower nozzle, aluminium block mode of heating is printed, while laser motion position will mutually coordinate with printing path completely, once printing swashs
Light walking path is inconsistent with silk material printing path, causes material fully to melt, it is impossible to realize bonding well, to Gao Rong
The carbon fiber compounded special engineering plastics of point high-modulus, because heated light sources are spot light, silk material surface moment can melt, but
Inner core cannot be melted fully, and silk material hardness is very high, when crooked route is printed, it is impossible to be printed along path well, and shower nozzle is fast
The mobile silk material of speed can not be broken, and will drive the tear of adhesive segment.
The content of the invention
For the problem proposed in background technology, the invention provides a kind of glutinous thermoplasticity modeling high of short carbon fiber reinforced high temperature
Material rapid shaping screw extrusion apparatus, include supporting plate, barrel, screw rod, extrusion die, actuating unit, the barrel it is upper
End is arranged in the supporting plate, and the screw rod is placed in the barrel, the actuating unit install on the supporting plate and with it is described
Screw drive is connected, and the actuating unit drives the screw rod to rotate；Charging aperture is provided with the upper end side wall of the barrel, is moulded
Material particle is input into the barrel from charging aperture；The lower end of the barrel connects the extrusion die；
Temperature control equipment is also included, the temperature control equipment includes the first heating being arranged on the outside of barrel
Enclose, be arranged on extrusion die outside on the second heating collar, be arranged on the wall of barrel side the first thermocouple, be arranged on extrusion mould
The second galvanic couple and temperature control box on head, the first heating collar, the second heating collar, the first thermocouple, the second thermocouple with it is described
Temperature control box is connected, and the real time temperature control first that the temperature control box feeds back according to first thermocouple and the second thermocouple is heated
Circle and the heating of the second heating collar.
It is preferred that the screw rod be three-stage constant lead screw, including order coaxial connection from top to bottom feed zone spiral shell
Bar, compression section screw rod and metering section screw rod.
It is preferred that first heating collar includes feed zone heating collar, compression section heating collar and metering section heating collar, enter
Material section heating circle, compression section heating collar, metering section heating collar are separately positioned on and the feed zone screw rod, compression section screw rod, meter
On the circle of lateral wall one of the relative barrel of amount section screw rod；
First thermocouple includes feed zone thermocouple, compression section thermocouple and metering section thermocouple, feed zone heat
Galvanic couple, compression section thermocouple, metering section thermocouple are separately positioned on and the feed zone screw rod, compression section screw rod, metering section spiral shell
On the lateral wall of the relative barrel of bar.
It is preferred that the helical angle of the screw rod is 14.3 °；Feed zone spiro rod length is 207-225mm, groove depth 3-3.5mm；
Metering section spiro rod length is 115-125mm, groove depth 1-1.3mm；Compression section spiro rod length is 138-150mm, becomes groove depth transition, preceding
End and feed zone screw rod equivalent gullet depth, end and metering section screw rod equivalent gullet depth.
It is preferred that the upper end of the barrel connects the lower surface of the supporting plate by flange, the upper end of the screw rod is worn
The flange, supporting plate is crossed to be connected with actuating unit；Radiating is also arranged with screw rod between the flange and the supporting plate
Device.
It is preferred that the heat abstractor includes the heat sink of cylindrical heatsink and surrounding perforate, the cylinder dissipates
Hot plate is set on the screw rod, and the heat sink encloses the circle for being located at the cylindrical heatsink.
It is preferred that the heat abstractor also includes cylindrical heatsink, the heat sink of surrounding perforate, accelerates radiating rate
Air blower.
It is preferred that the upper end of the screw rod is located in the supporting plate by bearing, and institute is stretched out in the screw rod upper end
State supporting plate；The screw rod upper end is connected by gear drive with actuating unit；
The gear drive includes first gear, second gear, the upper end of the first gear and the screw rod
Drive connection, the first gear is engaged with second gear, the second gear and the actuating unit drive connection.
It is preferred that the actuating unit includes motor and speed reducer, the motor via reducer and the second gear
Drive connection；The motor and the reductor are fixed in the supporting plate；A connection is fixedly connected with the supporting plate
Reinforcement is provided between plate, and the connecting plate and the supporting plate.
It is preferred that stepper motor of the motor using 86HS15060A4 models, the reductor is using speed than 30
FB90-50-S2-P2 model planet-gear speed reducers.
It is preferred that being provided with feeding mechanism on the charging aperture, the feeding mechanism includes conveying pipeline and hopper, described
One end connection charging aperture of conveying pipeline, the other end connects the hopper；The conveying pipeline is connected by fastening block with the barrel；
The hopper is provided with a material blocking block with the connectivity part of the conveying pipeline, and the material blocking block is used to change the hopper
Charging aperture opening size, adjust feed rate.
It is preferred that the extrusion die is made of DC53 mould steel, the screw rod uses Kazakhstan high-temperature alloy C276
It is made, the barrel is made of DC53 mould steel.
It is preferred that the extrusion die includes die holder, die body and the exchangeable nozzle of order coaxial connection, and the mould
The center of seat, die body and exchangeable nozzle is axially arranged die holder runner, the die body stream flowed through for plastics plastic melt respectively
Road, exchangeable nozzle runner；The die holder upper end is connected with the barrel lower end, and connects inside the die holder runner and barrel
It is logical.
It is preferred that being additionally provided with current divider in the die holder runner, the plastic melt in die holder runner is via the shunting
Flowed into the die body runner after device shunting；
Wherein, the upper end of the current divider is located in die holder runner, and lower end is located at the boundary of die holder runner and die body runner
Place；The upper end of the current divider is in a cone structure, and the lower end of the current divider is in a hemispherical configuration, the chondritic week
Multiple through holes are evenly equipped with upwards, and the through hole connects die holder runner and die body runner.
It is preferred that being provided with screen pack in the die body runner, the plastic melt in die body runner flows through the screen pack
Enter into the exchangeable nozzle, plastic melt is finally extruded from the mouth of the exchangeable nozzle
It is preferred that second heating collar is arranged on a circle of the die holder lateral wall；Second thermocouple is set
In the die holder towards in the mounting hole set on one end of the exchangeable nozzle.
The present invention is allowed to compared with prior art, have the following advantages that and actively imitate due to using above technical scheme
Really：
(1) in invention, by the design of power set, the output torque of pressure higher and Geng Gao can be provided, it is ensured that
Screw strength requirement under high temperature high pulling torque.
(2) in the present invention, by the setting of attemperating unit, respectively to feed zone, compression section, metering section, die head temperature
Degree carries out real-time monitoring and control, maintains each section of temperature stabilization in target temperature, and the moment meets the molten of high melt point thermoplastic plastics
Melt requirement；
(3) in the present invention, the radiating for being provided for screw rod of heat abstractor, it is to avoid high temperature is transmitted to screw rod upper end to be caused to push away
Power bearing failure；
(4) in the present invention, by the setting of current divider and screen pack, the not fully homogenizing modeling to being promoted by screw rod
Material melt is shunted to be homogenized again, prevents plastics from causing exchangeable nozzle to block in plasticizing inequality before, it is ensured that plastic melt
Smooth extrusion and the quality of wire vent.
Brief description of the drawings
With reference to accompanying drawing, by hereafter state detailed description, can be more clearly understood that above-mentioned and other feature of the invention and
Advantage, wherein：
Fig. 1 is a kind of short carbon fiber reinforced high temperature glutinous thermoplastic rapid shaping Screw Extrusion dress high that the present invention is provided
Put principle schematic；
Fig. 2 is a kind of short carbon fiber reinforced high temperature glutinous thermoplastic rapid shaping Screw Extrusion dress high that the present invention is provided
The external form schematic diagram put；
Fig. 3 is the scheme of installation of barrel screw mechanism in the present invention；
Fig. 4 is the principle schematic of extrusion die in the present invention；
Fig. 5 is the connection diagram of extrusion die and barrel in the present invention.
Specific embodiment
Referring to the accompanying drawing for showing the embodiment of the present invention, the present invention is described in more detail.However, the present invention can be with
Many multi-forms realize, and should not be construed as and limited by the embodiment for herein proposing.Conversely, proposing that these embodiments are
In order to reach abundant and complete disclosure, and those skilled in the art are made to understand the scope of the present invention completely.These are attached
In figure, for clarity, the size and relative size in layer and region are may be exaggerated.
The invention provides a kind of short carbon fiber reinforced high temperature glutinous thermoplastic rapid shaping screw extrusion apparatus high, use
In the isostructural rapid shaping of space structure part, Large Spacecraft film ribs, the device mainly includes decelerating through motor
Machine drive mechanism, gear drive, barrel screw rod pusher, minitype nozzle pressing mechanism, electromagnetic induction heating control machine
Structure etc..The screw extrusion apparatus can provide the output torque of pressure higher and Geng Gao, it is ensured that screw rod is strong under high temperature high pulling torque
Degree require, electromagnetic heating system can it is more efficient it is accurate control temperature and keep stabilization；It is high glutinous the invention is intended to print high temperature
The space structure part of short fiber reinforced plastics is spent, is that the 3D printing of space applicability material provides the foundation.
Wherein, a diameter of 1-3mm of processed plastic grain, is short carbon fiber reinforced polyimides (SCF/TPI), short carbon
Fiber reinforcement polyether-ether-ketone (SCF/PEEK), without the high temperature such as fiber reinforcement special engineering plastics glutinous thermoplastic particle high.
Specifically, rapid shaping screw extrusion apparatus include supporting plate 20, barrel 5, screw rod 10, extrusion die, power
Mechanism；The upper end of barrel 5 is arranged in supporting plate 20, screw rod 10 as in barrel 5, actuating unit be arranged in supporting plate 20 and
It is connected with screw rod 10, actuating unit drives screw rod 10 to rotate；Charging aperture, plastics are provided with the upper end side wall of barrel 5
Grain is from charging aperture input barrel 5；The lower end connection extrusion die of barrel 5.Screw extrusion apparatus also include temperature control dress
Put, temperature control equipment includes and is arranged on the first heating collar on the outside of barrel on a circle, is arranged on the circle of extrusion die one
Second heating collar 2, the first thermocouple 36 being arranged on the side wall of barrel 5, the second galvanic couple 43 being arranged on extrusion die and
Temperature control box, the first heating collar, the second heating collar 2, the first thermocouple 36, the second thermocouple 43 are connected with temperature control box, temperature control box
The real time temperature fed back according to the first thermocouple and the second thermocouple controls the first heating collar and the heating of the second heating collar.
In the present embodiment, screw rod 10 is inserted vertically into barrel 5, and the upper end of screw rod 10 by the first shaft shoulder boss bottom surface with
Barrel 5 is contacted, for standing screw 10 and the position to axial of barrel 5.The upper end of barrel 5 is by flange 12 and is equipped with screw
11 are installed in supporting plate 20, and the upper end of the screw rod 10 in barrel 5 passes through supporting plate 20；Between flange 12 and supporting plate 20
Heat abstractor is also arranged with screw rod 10, heat abstractor includes the heat sink 13 of cylindrical heatsink 16 and surrounding perforate, circle
Cylindricality heat sink 16 is set on screw rod 10, and heat sink 13 encloses the circle for being located at cylindrical heatsink 16；Heat abstractor also includes
There is air blower 25, air blower 25 is arranged in supporting plate 20, air blower 25 is used to accelerate cylindrical heatsink 16 and heat sink 13
Radiating.The setting of heat abstractor is mainly used for the radiating of screw rod 10 in the present invention, it is to avoid high temperature is transmitted to screw rod upper end and leads
Thrust bearing 15 is caused to fail.
In the present embodiment, the upper end of screw rod 10 passes through supporting plate 20, and thrust is provided between screw rod 10 and supporting plate 20
Bearing 15, so that screw rod 10 can be rotated relative to supporting plate 20；Wherein, thrust bearing 15 can specifically be pushed away using NSK81105
Power roller bearing.
In the present embodiment, screw rod 10 realizes drive connection, gear drive machine by gear drive with actuating unit
Structure includes first gear, second gear, and actuating unit includes motor 24 and reductor 23.Specifically, the upper end of screw rod 10
It is connected with first gear by key through supporting plate 20, and first gear and spiral shell is realized by gear cap 17 and screw 28
Being fixedly and coaxially connected between bar 10, and cause to leave certain spacing between first gear and the upper surface of supporting plate 20；Motor
24 and reductor 23 be arranged on the lower surface of supporting plate 20, the output shaft of reductor 23 passes through key and second through supporting plate 20
Gear drive is connected, and realizes being fixedly and coaxially connected between second gear and output shaft by gear cap 17 and screw 28,
And cause to leave certain spacing between second gear and the upper surface of supporting plate 20；First gear is meshed with second gear, work
During making, motor 24 drives second gear to rotate by reductor 23, and second gear is rotated and drives first gear to rotate, the
One pinion rotation drives screw rod 10 to rotate, so as to realize for the moment of torsion that reductor is exported passing to screw rod by gear drive
10。
Wherein, motor 24 uses the stepper motor of 86HS15060A4 models, FB90-50- of the reductor using speed than 30
S2-P2 model planet-gear speed reducers, output bigger moment of torsion while reducing speed, so as to meet the big torsion of high viscosity plastics
Square needs；Meanwhile, on the one hand the output speed of motor can be maintained under optimum speed, on the other hand also by the rotating speed of screw rod
Control is in a rational scope.
Wherein, first gear is identical with second gear, all using the gear of 3 mould 48.
Wherein, first gear and second gear are respectively positioned on the upper surface of supporting plate 20, and first gear and second gear
In sustained height；A cover 19 is also covered with first gear and second gear, cover 19 is connected with supporting plate 20, and cover 19 is used
In protection first gear and second gear, prevent gear from occurring in rotation process unexpected.
Wherein, motor 24 and the upper end of reductor 23 are fixed in supporting plate 20, and the lower end of supporting plate 20 is vertically connected with a company
Fishplate bar 22, is additionally provided with reinforcement 21 between connecting plate 22 and supporting plate 20, connected for reinforcing.
In the present embodiment, feeding mechanism is connected with charging aperture, feeding mechanism includes conveying pipeline and hopper 9, conveying
Pipe one end connects charging aperture, other end connection hopper 9；Conveying pipeline is connected by fastening block 14 with supporting plate 20；Hopper 9 and conveying
The connectivity part of pipe is provided with a material blocking block 26, and material blocking block 26 is used for the size of the charging aperture opening for changing hopper 9, adjusts into stream
Amount.
In the present embodiment, screw rod be three-stage constant lead screw, including order coaxial connection from top to bottom feed zone
Screw rod, compression section screw rod and metering section screw rod.Wherein, the helical angle of screw rod is 14.3 °, and feed zone spiro rod length is 207-
225mm, groove depth 3-3.5mm；Metering section spiro rod length is 115-125mm, groove depth 1-1.3mm；Compression section spiro rod length is 138-
150mm, becomes groove depth transition, front end and feed zone screw rod equivalent gullet depth, end and metering section screw rod equivalent gullet depth.Certainly, the tool of screw rod
Body size is adjusted also dependent on concrete condition, is not limited herein.
In the present embodiment, the first heating collar includes the heating of feed zone heating collar 7, compression section heating collar 6 and metering section
Circle 4, feed zone heating collar 7, compression section heating collar 6, metering section heating collar 4 are respectively sleeved at and feed zone screw rod, compression section spiral shell
On the circle of lateral wall one of the relative barrel of bar, metering section screw rod；Feed zone heating collar 7, the heating of compression section heating collar 6, metering section
Circle 4 is used to respectively heat the plastics in feed zone, compression section, metering section.
First thermocouple includes feed zone thermocouple, compression section thermocouple and metering section thermocouple, feed zone thermocouple,
Compression section thermocouple, metering section thermocouple are separately positioned on the spiral shell relative with feed zone screw rod, compression section screw rod, metering section screw rod
In screw 29 on the lateral wall of cylinder.Feed zone thermocouple, compression section thermocouple, metering section thermocouple are used for detection charging respectively
Section, compression section, the real time temperature of plastics in metering section.
In the present embodiment, temperature control box is according to the first electroheat pair 36 in the side wall of barrel 5, installed in extrusion die
Real time temperature that the second interior thermocouple 43 is detected and fed back controls feed zone heating collar 7, compression section heating collar 6, metering section
Heating collar 4, the second heating collar 2 is heated to screw rod and extrusion die；Wherein, temperature control box uses PID control；Wherein, enter
Material section heating circle 7, compression section heating collar 6, metering section heating collar 4, the second heating collar 2 can be added using way of electromagnetic induction
Heat, can also use other mode of heatings certainly, not be limited herein.
In the present embodiment, four sections of heating collars are heated using non-isothermal, and the heating-up temperature of feed zone heating collar 7 is 350-360
DEG C, the heating-up temperature of compression section heating collar 6 is 355-375 DEG C, and the heating-up temperature of metering section heating collar 4 is 370-385 DEG C, second
The heating-up temperature of heating collar 2 is 375-390 DEG C, and, in 40-60mm, display is each in real time for temperature control box for distance controlling between each section of heating collar
Duan Wendu is simultaneously controlled, and maintains each section of temperature stabilization in target temperature.
In the present embodiment, extrusion die includes die holder 3, die body 38 and exchangeable nozzle 1, die holder 3, die body 38 and can
Change the order coaxial connection of nozzle 1.
Specifically, die body 38 upper end inject die holder 3 lower end and be attached by screw thread, exchangeable nozzle 1 it is upper
Inject in the lower end of die body 38 and be attached by screw thread, the mode being threadedly coupled between exchangeable nozzle 1 and die body 38 in end
Can be in order to the nozzle of quick-replaceable different model.
Further, the center of die holder 3 is axially arranged die holder runner, and the center of die body 38 is axially arranged die body
Runner, the center of exchangeable nozzle 1 is axially arranged exchangeable nozzle runner, die holder runner, die holder runner, exchangeable nozzle
Runner is coaxial and is connected, and plastic melt flows successively through die body runner and exchangeable nozzle runner from die holder runner, finally from can
Change the mouth extrusion of the lower end of nozzle 1.
In the present embodiment, current divider 34 is coaxially arranged with die holder runner, and the lower surface of current divider 34 is located at die holder
Boundary between runner and die body runner；The upper end of current divider 34 is provided with cone structure, and lower end is provided with hemispherical configuration,
Hemispherical configuration is circumferentially evenly equipped with multiple through holes, and through hole is vertically arranged, and through hole connection die holder runner and die body runner.Die holder stream
Plastic melt in road first passes around cone structure and carries out preliminary shunting, then is further shunted by through hole.
In the present embodiment, screen pack 35 is additionally provided with die body runner, screen pack 35 can be set or be threadedly coupled by card
It is horizontally set in die body runner etc. mode, is not limited herein；Plastic melt in die body runner flows through screen pack 35 and filters
Afterwards, enter back into exchangeable nozzle 1.
The setting that the present invention passes through current divider 34 and screen pack 35, first moulds to the high viscosity molten thermoplastic containing carbon fiber
Material is shunted, and the plastic melt of shunting passes through the aperture of screen pack 35, prevents plastics from causing nozzle to block up in plasticizing inequality before
Plug, while homogenizing to plastic melt, it is ensured that the homogenizing degree of high viscosity plastic melt and go out yarn quality.
In the present embodiment, the second heating collar 2 is set on the circle of the outside one of die holder 3；Die holder 3 is towards exchangeable nozzle 1
One end on be provided with a mounting hole 41, the second thermocouple 43 is arranged in mounting hole 41.
In the present embodiment, barrel 5 is connected with die holder 3, and its internal connection；Some immersing oneself in is evenly equipped with the circumference of die holder 3
Hole 42, passes through countersunk 42 and is equipped with screw realization connection between barrel 5 and die holder 3；The diameter of barrel 5 and the diameter of die holder 3
Identical, directly as the adpting flange between connection die head and barrel 5, this connected mode reduces flange for the end of die holder 3
Size so that die head is integrally more minimized.
In the present embodiment, rapid shaping extrusion die is made of DC53 mould steel, vacuum hardening after modifier treatment, is obtained
To high tenacity DC53 die heads；Using DC53 die heads, melting extrusion shaping common material shower nozzle used is can solve in high temperature
Lower mechanical properties decrease is serious, easy fragmentation shortcoming.
In the present embodiment, screw rod 10 uses Kazakhstan high-temperature alloy C276, barrel 5 to use DC53 mould steel, to ensure
Its intensity at high temperature.
A kind of short carbon fiber reinforced high temperature glutinous thermoplastic rapid shaping screw extrusion apparatus high that the present invention is provided, its
The course of work is as follows：
Shift striker plate 26 onto bottom, short carbon fiber reinforced plastic grain body 8 is poured into hopper, now granule is introduced into
Hopper bottom, sets the temperature of temperature control box 37, and four heating zones are respectively provided with different target temperatures；When thermocouple 36 is measured respectively
When section actual temperature is consistent with target temperature, starts motor 24 and rotate screw rod 10, while start air blower 25 radiate, by material blocking block
26 open a certain distance, control the flow of charging so that flow is consistent with screw rod rotary speed, it is ensured that charging reaches screw channel
It is interior；Granule 8 is gradually melted to be promoted by screw rod after barrel is entered and moved downward, and molten plastic is squeezed compression moulding in pushing course
Change, when moving to compression section, because spiral groove depth gradually becomes shallower as, plastics are extruded densification, and at metering section, plastics are with certain
Consistency is rotated and rotated with screw rod；When reaching die head, shunted by the current divider 34 in die holder, molten plastic is in huge pressure
It is lower plastics is reached more preferable homogenizing degree by screen pack 35, the aggregation in nozzle 1 by the plastics of screen pack 35；Screw rod after
It is continuous to rotate, promote plastics below to advance, huge pressure promotes the plastic extrusion in nozzle, in the platform with three-dimensional motion
Upper shaping ribs.
Those skilled in the art should be understood that the present invention can be implemented without departing from it with many other concrete forms
The spirit or scope of itself.Although having been described for case study on implementation of the invention, it should be understood that the present invention should not be limited to these implementations
Example, change is made within the spirit and scope of the present invention that those skilled in the art can define such as appended claims
And modification.
Claims (16)
1. a kind of short carbon fiber reinforced high temperature glutinous thermoplastic rapid shaping screw extrusion apparatus high, it is characterised in that including
The upper end for having supporting plate, barrel, screw rod, extrusion die, actuating unit, the barrel is arranged in the supporting plate, the spiral shell
Bar is placed in the barrel, and the actuating unit is installed and is connected on the supporting plate and with the screw drive, the actuating unit band
The dynamic screw rod is rotated；Charging aperture is provided with the upper end side wall of the barrel, plastic grain is input into the barrel from charging aperture
It is interior；The lower end of the barrel connects the extrusion die；
Also include temperature control equipment, the temperature control equipment include be arranged on the outside of barrel the first heating collar, set
Put the second heating collar on the outside of extrusion die, the first thermocouple being arranged on the wall of barrel side, be arranged on extrusion die
The second galvanic couple and temperature control box, the first heating collar, the second heating collar, the first thermocouple, the second thermocouple with the temperature control
Case is connected, the real time temperature that the temperature control box feeds back according to first thermocouple and the second thermocouple control the first heating collar and
Second heating collar is heated.
2. short carbon fiber reinforced high temperature according to claim 1 glutinous thermoplastic rapid shaping screw extrusion apparatus high,
Characterized in that, the screw rod be three-stage constant lead screw, including order coaxial connection from top to bottom feed zone screw rod, pressure
Contracting section screw rod and metering section screw rod.
3. short carbon fiber reinforced high temperature according to claim 1 glutinous thermoplastic rapid shaping screw extrusion apparatus high,
Characterized in that, first heating collar includes feed zone heating collar, compression section heating collar and metering section heating collar, feed zone
Heating collar, compression section heating collar, metering section heating collar are separately positioned on and the feed zone screw rod, compression section screw rod, metering section
On the circle of lateral wall one of the relative barrel of screw rod；
First thermocouple includes feed zone thermocouple, compression section thermocouple and metering section thermocouple, feed zone thermocouple,
Compression section thermocouple, metering section thermocouple are separately positioned on relative with the feed zone screw rod, compression section screw rod, metering section screw rod
Barrel lateral wall on.
4. short carbon fiber reinforced high temperature according to claim 2 glutinous thermoplastic rapid shaping screw extrusion apparatus high,
Characterized in that, the helical angle of the screw rod is 14.3 °；Feed zone spiro rod length is 207-225mm, groove depth 3-3.5mm；Metering
Section spiro rod length is 115-125mm, groove depth 1-1.3mm；Compression section spiro rod length be 138-150mm, become groove depth transition, front end with
Feed zone screw rod equivalent gullet depth, end and metering section screw rod equivalent gullet depth.
5. short carbon fiber reinforced high temperature according to claim 1 glutinous thermoplastic rapid shaping screw extrusion apparatus high,
Characterized in that, the upper end of the barrel connects the lower surface of the supporting plate by flange, the upper end of the screw rod passes through institute
Flange, supporting plate is stated to be connected with actuating unit；Heat abstractor is also arranged with screw rod between the flange and the supporting plate.
6. short carbon fiber reinforced high temperature according to claim 5 glutinous thermoplastic rapid shaping screw extrusion apparatus high,
Characterized in that, the heat abstractor includes the heat sink of cylindrical heatsink and surrounding perforate, the cylindrical heat-radiating plate
It is set on the screw rod, the heat sink encloses the circle for being located at the cylindrical heatsink.
7. short carbon fiber reinforced high temperature according to claim 6 glutinous thermoplastic rapid shaping screw extrusion apparatus high,
Characterized in that, the drum that the heat abstractor also includes cylindrical heatsink, the heat sink of surrounding perforate, accelerates radiating rate
Blower fan.
8. short carbon fiber reinforced high temperature according to claim 1 glutinous thermoplastic rapid shaping screw extrusion apparatus high,
Characterized in that, the upper end of the screw rod is located in the supporting plate by bearing, and the branch is stretched out in the screw rod upper end
Fagging；The screw rod upper end is connected by gear drive with actuating unit；
The gear drive includes first gear, second gear, and the first gear drives with the upper end of the screw rod
Connection, the first gear engages with second gear, the second gear and the actuating unit drive connection.
9. short carbon fiber reinforced high temperature according to claim 8 glutinous thermoplastic rapid shaping screw extrusion apparatus high,
Characterized in that, the actuating unit includes motor and speed reducer, the motor via reducer is driven with the second gear
Connection；The motor and the reductor are fixed in the supporting plate；A connecting plate is fixedly connected with the supporting plate, and
Reinforcement is provided between the connecting plate and the supporting plate.
10. short carbon fiber reinforced high temperature according to claim 9 glutinous thermoplastic rapid shaping screw extrusion apparatus high,
Characterized in that, stepper motor of the motor using 86HS15060A4 models, FB90- of the reductor using speed than 30
50-S2-P2 model planet-gear speed reducers.
11. short carbon fiber reinforced high temperature glutinous thermoplastic rapid shaping screw extrusion apparatus high according to claim 1,
Characterized in that, being provided with feeding mechanism on the charging aperture, the feeding mechanism includes conveying pipeline and hopper, the conveying
One end connection charging aperture of pipe, the other end connects the hopper；The conveying pipeline is connected by fastening block with the barrel；
The hopper is provided with a material blocking block with the connectivity part of the conveying pipeline, and the material blocking block is used to change entering for the hopper
The size of material mouth opening, adjusts feed rate.
12. short carbon fiber reinforced high temperature glutinous thermoplastic rapid shaping screw extrusion apparatus high according to claim 1,
Characterized in that, the extrusion die is made of DC53 mould steel, the screw rod is made of Kazakhstan high-temperature alloy C276,
The barrel is made of DC53 mould steel.
13. short carbon fiber reinforced high temperature glutinous thermoplastic rapid shaping screw extrusion apparatus high according to claim 1,
Characterized in that, the extrusion die includes die holder, die body and the exchangeable nozzle of order coaxial connection, and the die holder, mould
The center of body and exchangeable nozzle is axially arranged have respectively the die holder runner flowed through for plastics plastic melt, die body runner, can
Change nozzle flow channel；The die holder upper end is connected with the barrel lower end, and the die holder runner is connected with barrel inside.
14. short carbon fiber reinforced high temperature glutinous thermoplastic rapid shaping Screw Extrusion dresses high according to claim 13
Put, it is characterised in that current divider is additionally provided with the die holder runner, the plastic melt in die holder runner is via the current divider
Flowed into after shunting in the die body runner；
Wherein, the upper end of the current divider is located in die holder runner, and lower end is located at the boundary of die holder runner and die body runner；Institute
The upper end of current divider is stated in a cone structure, the lower end of the current divider is in a hemispherical configuration, in the chondritic circumference
Multiple through holes are evenly equipped with, the through hole connects die holder runner and die body runner.
15. short carbon fiber reinforced high temperature glutinous thermoplastic rapid shaping Screw Extrusion dresses high according to claim 13
Put, it is characterised in that screen pack is provided with the die body runner, the plastic melt in die body runner flows through the screen pack and enters
Enter in the exchangeable nozzle, plastic melt is finally extruded from the mouth of the exchangeable nozzle.
16. short carbon fiber reinforced high temperature glutinous thermoplastic rapid shaping Screw Extrusion dresses high according to claim 13
Put, it is characterised in that second heating collar is arranged on a circle of the die holder lateral wall；Second thermocouple is arranged on
The die holder is towards in the mounting hole set on one end of the exchangeable nozzle.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109968659A (en) * | 2019-04-09 | 2019-07-05 | 天津大学 | One kind deepening equidistant screw biology 3D printing extrusion device |
| CN110091490A (en) * | 2019-05-14 | 2019-08-06 | 郑微丹 | Novel extrusion molding machine for plastic processing |
| CN112673195A (en) * | 2018-09-07 | 2021-04-16 | 日立安斯泰莫株式会社 | Method for manufacturing rotary power transmission member |
| NL1043469B1 (en) * | 2019-11-19 | 2021-08-11 | Veda Group B V | Method, 3d manufacturing system and print head therfor |
| NL1043468B1 (en) * | 2019-11-19 | 2021-08-17 | Veda Group B.V. | Method, 3d manufacturing system and print head therfor |
| NL1043470B1 (en) * | 2019-11-19 | 2021-08-18 | Veda Group B V | Method, 3d manufacturing system and print head therfor |
| CN113320145A (en) * | 2021-06-07 | 2021-08-31 | 青岛大学 | Laser-assisted two-section type screw rapid melting deposition nozzle |
| WO2022116219A1 (en) * | 2020-12-05 | 2022-06-09 | 南京溧水高新创业投资管理有限公司 | Extrusion device having good material fluidity |
| WO2022232888A1 (en) * | 2021-05-07 | 2022-11-10 | EELO Group Pty Ltd | Extruder for a three-dimensional printer |
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| CN105216327A (en) * | 2015-10-27 | 2016-01-06 | 大连理工大学 | A kind of melt extrusion apparatus of thermoplastic granulates material and 3D Method of printing thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105216327A (en) * | 2015-10-27 | 2016-01-06 | 大连理工大学 | A kind of melt extrusion apparatus of thermoplastic granulates material and 3D Method of printing thereof |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112673195A (en) * | 2018-09-07 | 2021-04-16 | 日立安斯泰莫株式会社 | Method for manufacturing rotary power transmission member |
| CN112673195B (en) * | 2018-09-07 | 2024-03-19 | 日立安斯泰莫株式会社 | Method for manufacturing rotary power transmission member |
| CN109968659A (en) * | 2019-04-09 | 2019-07-05 | 天津大学 | One kind deepening equidistant screw biology 3D printing extrusion device |
| CN110091490A (en) * | 2019-05-14 | 2019-08-06 | 郑微丹 | Novel extrusion molding machine for plastic processing |
| NL1043469B1 (en) * | 2019-11-19 | 2021-08-11 | Veda Group B V | Method, 3d manufacturing system and print head therfor |
| NL1043468B1 (en) * | 2019-11-19 | 2021-08-17 | Veda Group B.V. | Method, 3d manufacturing system and print head therfor |
| NL1043470B1 (en) * | 2019-11-19 | 2021-08-18 | Veda Group B V | Method, 3d manufacturing system and print head therfor |
| WO2022116219A1 (en) * | 2020-12-05 | 2022-06-09 | 南京溧水高新创业投资管理有限公司 | Extrusion device having good material fluidity |
| WO2022232888A1 (en) * | 2021-05-07 | 2022-11-10 | EELO Group Pty Ltd | Extruder for a three-dimensional printer |
| CN113320145A (en) * | 2021-06-07 | 2021-08-31 | 青岛大学 | Laser-assisted two-section type screw rapid melting deposition nozzle |
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