CN210283271U - Double-channel 3D printing head based on aerogel wrapping layer and used on rail - Google Patents
Double-channel 3D printing head based on aerogel wrapping layer and used on rail Download PDFInfo
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- CN210283271U CN210283271U CN201920910840.XU CN201920910840U CN210283271U CN 210283271 U CN210283271 U CN 210283271U CN 201920910840 U CN201920910840 U CN 201920910840U CN 210283271 U CN210283271 U CN 210283271U
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Abstract
An aerogel blanket based dual channel 3D printhead for in-track use, comprising: heating block, gland pipe, fibre pipe, choke, cooling tube, shower nozzle, aerogel parcel layer, silk material direction coupling, polytetrafluoroethylene pipe, polyimide heat insulating mattress. The utility model discloses an aerogel parcel layer carries out hot environmental control to space 3D print head subassembly, both satisfies the heating piece and prints the regional high temperature demand of shower nozzle, also satisfies the low temperature environment demand of beating other accessories of printer head periphery, reduces waste heat radiation, and the effectual thermal-insulated protection of establishing is utilized to the high efficiency. The utility model discloses the method has that the material of use is few, implementation technology is convenient, with low costs, and is pollution-free, and the space is printed in orbit 3D and is practiced thrift the energy consumption, heat preservation and insulate against heat effectually.
Description
Technical Field
The utility model relates to a duplex way 3D who uses on rail based on aerogel parcel layer beats printer head belongs to space vibration material disk field.
Background
The printing nozzle is a core component of the 3D printer, and microenvironment control near the printing nozzle is a key factor for determining the performance and quality of the printed product. 3D printing forming equipment on the market at present basically has no energy consumption limitation, and in order to reach the softening point of materials such as polylactic acid, polyether ether ketone and the like, a high-power electric heating rod is used for a nozzle heating block, and a printing nozzle is heated to the temperature of 210 ℃, 350 ℃ and the like at a high speed from normal temperature. And most polylactic acid printer cabin bodies are in an open state, and when the materials extruded by the spray heads reach the base plate, air convection is enhanced through the fan, so that cooling forming is realized. When the printing head heating mode is applied to space 3D printing in the spacecraft cabin, the following problems exist:
1) the heating block is the main energy consuming component. Ground 3D prints the in-process, through powerful heating rod, can make to print the shower nozzle and heat up rapidly to continuously heating keeps the shower nozzle temperature to be higher than material melting temperature, this kind of mode of heating all the time need continuously consume higher energy. Terrestrial 3D printing typically uses 220V commercial voltage, or 360V industrial voltage. The power supply provided by the space spacecraft is usually 24-33V, the current control is relatively low, the power provided is limited, and the high-power load cannot be provided for a long time.
2) Air convection is the primary channel for heat dissipation. Most of the fused deposition modeling 3D printing equipment for printing polylactic acid and other materials on the market are open equipment, namely, the printing head and the substrate are both in a room-temperature air convection environment, even if the local temperature is too high, the air convection is enhanced through the fan, and the temperature of other parts near the spray head can be reduced. Some print heads are also provided with more than 2 fans, and the redundant heat is taken away through a plurality of air flow channels. The space inside the spacecraft is limited, even if the air convection is increased in the sealed cabin, the air flow rate and the circulation range are limited, and the redundant heat is brought to other loads in the cabin through the fan, so that the overall environmental heat load is increased, and obviously, the situation is unreasonable.
SUMMERY OF THE UTILITY MODEL
The technical solution problem of the utility model is that: overcome prior art's not enough, provided a duplex channel 3D who uses on the rail based on aerogel parcel layer and beaten printer head, can the high-efficient energy that utilizes, reduce waste heat radiation, both satisfied the high temperature demand of heating piece and printing shower nozzle, also satisfied the low temperature environment demand of beating other annexs of printer head periphery, establish effectual thermal-insulated protection.
The technical scheme of the utility model is that:
an aerogel blanket based dual channel 3D printhead for in-track use, comprising: the device comprises a heating block, a gland pipe, a fiber conduit, a throat pipe, a radiating pipe, a spray head, an aerogel wrapping layer, a wire material guide pipe joint, a polytetrafluoroethylene pipe and a polyimide heat insulation pad;
the heating block is provided with a first passage and a second passage, and the axis of the first passage and the axis of the second passage are coplanar and intersected; the included angle theta between the first passage axis and the second passage axis ranges from 15 degrees to 60 degrees;
the first passage is a stepped through hole, one end of the first passage is connected with one end of the fiber guide pipe, the other end of the fiber guide pipe is fixedly connected with one end of the gland pipe, and the other end of the gland pipe extends out of the heating block; the gland pipe is connected with the heating block through threads so that the position of the fiber guide pipe in the heating block is fixed; the other end of the first passage is fixedly connected with the spray head;
the second passage is a stepped hole, and one end of the second passage is communicated with the first passage; the throat pipe, the radiating pipe and the wire material guide pipe joint are sequentially connected, and the end part of the throat pipe is fixedly connected with the other end of the second passage;
a conical groove is formed in the end part of the spray head, and a cavity formed by the conical groove and the inner wall of the first passage is used as a molten pool; a polytetrafluoroethylene tube is inserted into the throat tube from the wire guide tube joint and the radiating tube, and the polytetrafluoroethylene tube is used for guiding the thermoplastic material into the molten pool; the continuous fiber reinforcement sequentially flows into the molten pool through the gland pipe and the fiber guide pipe;
the intersection point of the first passage axis and the second passage axis is used as a fusion point, and the fusion point is positioned in the molten pool; the fusion point position satisfies the following proportional relation:
d1：d2：d3＝1：1：0.45，
wherein d1 is the distance from the fusion point to the intersection point of the heating block surface and the vertical intersection of the axis of the gland pipe, d2 is the distance from the fusion point to the intersection point of the heating block surface and the vertical intersection of the throat pipe axis, and d3 is the distance from the fusion point to the intersection point of the heating block surface and the vertical intersection of the axis of the spray head;
the inner diameter of the gland pipe is larger than that of the fiber guide pipe, and the inner diameter of the second passage is larger than that of the fiber guide pipe; the inner diameter of one end, connected with the first passage, of the spray head is larger than that of the second passage;
the outer wall of the heating block is anodized by phosphoric acid; the outer wall parcel of heating block has the aerogel parcel layer that is used for thermal-insulated, the material of aerogel parcel layer is for pre-oxygen silk reinforcing SiO2The thickness of the aerogel wrapping layer ranges from 1mm to 5 mm;
a polyimide heat insulation pad is fixed on the end face of the heating block, which is provided with a gland pipe, a central through hole is formed in the polyimide heat insulation pad, and the gland pipe penetrates through the central through hole of the polyimide heat insulation pad and is inserted into the heating block; and a heating rod and a plurality of temperature sensors for heating the heating block are arranged in the heating block.
Compared with the prior art, the utility model beneficial effect be:
1) heat insulation problem is usually not considered to present ground 3D printer heating piece, and occasionally printer selectsHeat insulation felt and glass fiber reinforced aerogel are used as the box body heat insulation material; the felt is a restricted material of the spacecraft, the glass fiber reinforced aerogel has low adhesive force, and the felt and the aerogel are easy to generate scraps and powder in the environments of microgravity, vibration and the like to form redundancy and influence other electronic devices. The utility model adopts the superfine pre-oxidized fiber as the reinforcement and utilizes sol-gel and supercritical CO2The drying process is used for self-preparing the high-performance pre-oxidized fiber reinforced silicon dioxide aerogel meeting the requirement of the aerospace environment through precise structure and performance control, and the density range is 0.15-0.4 g/cm3The range of the room temperature thermal conductivity coefficient is 0.012-0.018W/(m.K), the material has excellent bending performance and anti-seismic performance, does not fall powder or generate fragments under the high-frequency vibration emitted by the spacecraft, has light density and high thermal conductivity, can play a good thermal insulation effect and can bear larger load impact;
2) the traditional multichannel 3D printing often can appear the material and kick, the shower nozzle blocks up the condition such as, and the main reason is that thermoplastic material's viscosity is big, mobility is poor, and material programming rate, wire feed speed, printing shaping speed etc. do not match and lead to. The utility model discloses the coupling simulation of fluid and temperature field has been carried out on the design of binary channels, has accurately regulated and controlled the contained angle of first passageway and second passageway to and two passageway center junction to the distance of each terminal surface of heating block, and optimized the bell jar above the shower nozzle, make the resistance of binary channels flow to the shower nozzle far less than the resistance in the opposite direction, even the material of binary channels smoothly flows out along the shower nozzle under the zero gravity environment in space, avoided the condition of blocking up the passageway in the adverse current;
3) the traditional heating block is usually rectangular, cannot completely wrap the heating rod, has the characteristic of energy leakage of the heating rod, and usually has only one temperature sensor, and the actual temperature deviation of the printing spray head is about +/-10 ℃ due to the fact that the heating closed-loop control is carried out by utilizing the temperature, so that the influence on the flowability of the thermoplastic material is large. The utility model discloses a form that the heating piece combined together for boss and plane had both guaranteed to wrap up the heating rod comprehensively, had adopted two temperature sensor to carry out iterative closed-loop control again. Two temperature sensor measure initiative heating temperature and passive conduction temperature respectively, and the temperature of binary channels intersection district printing shower nozzle top can be calculated out to the survey that can be accurate, through heating closed loop control, can guarantee at whole printing in-process, the regional temperature deviation of shower nozzle top molten bath is at 3 ℃, and then has ensured the stability of thermoplastic material mobility for it is more smooth and easy to print.
4) The utility model relates to and made the silk material guide pipe joint that has the horn mouth for the polytetrafluoroethylene pipe that contains the second passageway silk material can vibrate at great within range, concentrates stress on the curved surface of a gradual change, has reduced polytetrafluoroethylene pipe fatigue fracture's risk in harsh mechanics vibration environment.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an axial sectional view of the structure of the present invention;
fig. 3a is a cross-sectional view of the heating block of the present invention;
fig. 3b is a side view of the heating block of the present invention;
FIG. 4 is a cross-sectional view of the wire guide pipe joint of the present invention;
FIG. 5 is a diagram illustrating the cutting shape and sticking sequence of the aerogel coating layer according to the present invention;
FIG. 6 is a side view of a polyimide heat insulating mat according to the present invention;
fig. 7 is a schematic view of the connection between the gland pipe and the fiber conduit according to the present invention.
Detailed Description
The utility model relates to a two-way 3D who uses on rail based on aerogel parcel layer beats printer head, the high temperature demand of the printing shower nozzle of the comprehensive consideration and the low temperature operation demand of other annexs on every side optimize the heat transfer way, when guaranteeing to print the inside temperature of shower nozzle, reduce the used heat that outwards scatters and disappears, through the thermal-insulated method of microenvironment control for the heat is concentrated in effective area, reduces the local thermal control of the inside other annexes of printer, reduces the power consumption of whole printer.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, for the utility model discloses the structural schematic diagram, the aerogel parcel layer 7 and the polyimide heat insulating mattress 10 of heating block 1 outside realize reducing the energy consumption, reduce radiating main part. As shown in fig. 2, the utility model relates to a two pass 3D who uses on the rail based on aerogel parcel layer beats printer head, include: heating block 1, gland pipe 2, fibre pipe 3, choke 4, cooling tube 5, shower nozzle 6, aerogel parcel layer 7, silk material direction coupling 8, polytetrafluoroethylene pipe 9, polyimide heat insulating mattress 10.
The material of heating block 1 is the aluminum alloy, the inside of heating block 1 is provided with heating rod 11, temperature sensor 12 and temperature sensor 13, temperature sensor 12 with temperature sensor 13 specifically adopts NTC thermistor to realize. The heating block 1 is provided with a first passage and a second passage, and the axis of the first passage and the axis of the second passage are coplanar and intersect; the value range of contained angle theta between first passageway axis and the second passageway axis is 15 ~ 60, specific the embodiment of the utility model provides an in the embodiment contained angle theta between first passageway axis and the second passageway axis value be 45. The first passage is a stepped through hole, one end of the first passage is connected with one end of a fiber guide pipe 3, the other end of the fiber guide pipe 3 is fixedly connected with one end of a gland pipe 2, and the other end of the gland pipe 2 extends out of the heating block 1; the gland pipe 2 is connected with the heating block 1 through threads, so that the position of the fiber guide pipe 3 in the heating block is fixed; the other end of the first passage is fixedly connected with the spray head 6. Heating rod 11 heats for heating block 1 through external power supply for the thermoplastic material melting in the second passageway, the embodiment of the utility model provides an in the thermoplastic material who adopts specifically be Polylactic acid (PLA), also can choose for use polyether ether ketone, polyether ketone etc. thermoplastic material. The temperature sensor 12 is used for testing the temperature actually reached by the heating block near the heating rod as an active heating temperature, and the temperature sensor 13 is used for testing the temperature near the junction of the two channels of the heating block as a passive heat transfer temperature. Through temperature sensor 12 and temperature sensor 13's temperature, combine the coefficient of heat conductivity of heating piece, the temperature of the binary channels intersection point department of calculating that can be accurate can guarantee to heat closed loop control at more accurate scope.
The second passage is a stepped hole, and one end of the second passage communicates with the first passage, as shown in fig. 3 (a). The throat pipe 4, the radiating pipe 5 and the wire material guide pipe joint 8 are sequentially connected, and the end part of the throat pipe 4 is fixedly connected with the other end of the second passage.
A tapered groove is formed in the end part of the spray head 6, and a cavity defined by the tapered groove and the inner wall of the first passage serves as a molten pool; the molten bath center is in the center of double-channel and joins the within range, the embodiment of the utility model provides an in sunken molten bath center is in double-channel's center meeting point below 1.2mm, the nodical 1.2mm department above the nodical of axis that is located the axis of first passageway and second passageway of 6 up end of shower nozzle and first passageway axis promptly. A polytetrafluoroethylene tube 9 is inserted into the throat 4 from the wire guide pipe joint 8 and the radiating pipe 5, and the polytetrafluoroethylene tube 9 is used for guiding the thermoplastic material into the molten pool; continuous fiber reinforcement loops through gland pipe 2, fibre pipe 3 flow in the molten pool, the embodiment of the utility model provides an in the continuous fiber reinforcement specifically adopt the carbon fiber, the brand is T300-1K, also can choose for use aramid fiber. The continuous fiber reinforcement and the thermoplastic wire form a composite material through a heating block molten pool area. And heat radiating teeth are circumferentially arranged on the heat radiating pipe 5. The polytetrafluoroethylene tube 9 is a hollow plastic tube.
The intersection point of the first passage axis and the second passage axis is used as a fusion point, and the fusion point is positioned in the molten pool; the fusion point position satisfies the following proportional relation:
d1：d2：d3＝1：1：0.45，
wherein d1 is the distance from the fusion point to the intersection point of the surface of the heating block 1 and the axis of the gland pipe 2, d2 is the distance from the fusion point to the intersection point of the surface of the heating block 1 and the axis of the throat pipe 4, and d3 is the distance from the fusion point to the intersection point of the surface of the heating block 1 and the axis of the spray head 6.
The gland pipe 2 is of a stainless steel cylindrical structure with external threads, the gland pipe 2 penetrates through the polyimide heat insulation pad 10 and is inserted into the heating block 1, a T-shaped groove is formed in the lower end of the gland pipe 2 and is used for fixing the fiber guide pipe 3, and the fiber guide pipe 3 is a titanium alloy thin pipe; the embodiment of the utility model provides an in fibre pipe 3's internal diameter be 0.8mm, just can satisfy the fibre of first passageway and pass through and do not have redundant space, prevent that the polylactic acid of second passageway from palirrhea, fibre pipe 3's upper end is T type groove, and it is fixed to form the crimping with 2 lower extreme T type groove sizes matching of gland pipe, as shown in figure 7. The inner diameter of the gland pipe 2 is larger than that of the fiber guide pipe 3, and the inner diameter of the second passage is larger than that of the fiber guide pipe 3; the inner diameter of the end of the spray head 6 connected with the first passage is larger than that of the second passage.
The outer wall of the heating block 1 is anodized by phosphoric acid; the outer wall parcel of heating block 1 has and is used for thermal-insulated aerogel parcel layer 7, for avoiding the heat leakage between the different regions, has carried out the processing of 3M sticky tape in needs trompil region, guarantees that aerogel parcel layer 7 is not heat leakage. The inner side of the aerogel wrapping layer 7 is bonded with the heating block 1, and the outer side of the aerogel wrapping layer is in contact with the gland pipe 2, the throat pipe 4 and the spray head 6, so that the wires are at a lower temperature before entering the heating block 1. The material of the aerogel wrapping layer 7 is pre-oxidized fiber reinforced SiO2Aerogel, pre-oxidized fiber reinforced SiO2The density value range of the aerogel is 0.15-0.4 g/cm3The value range of the room-temperature thermal conductivity coefficient is 0.012-0.018W/(m.K), and the pre-oxidized fiber reinforced SiO2The aerogel has excellent bending performance and seismic performance. The value range of 7 thickness of aerogel parcel layer is 1 ~ 5mm, the embodiment of the utility model provides an aerogel parcel layer 7's thickness is 5mm, and the oxygen silk reinforcing SiO in advance2The cutting shape of the aerogel film is shown in fig. 5, and overlapping margins are left at positions needing to be perforated, and the aerogel film is sequentially adhered to the heating block 1 according to the sequence of A-G.
A polyimide heat insulation pad 10 is fixed on the end face of the heating block 1, which is provided with the gland pipe 2, the polyimide heat insulation pad 10 is provided with a central through hole, and the gland pipe 2 penetrates through the central through hole of the polyimide heat insulation pad 10 and is inserted into the heating block 1; the polyimide insulation mat 10 is attached to the heating block 1 by four screws as shown in fig. 6.
Be provided with in the heating block 1 and be used for heating 1 heating rod 11 and a plurality of temperature sensor of heating block, heating block 1 has the arch between first passageway sprinkler head end and second passageway throat end, the embodiment of the utility model provides an outstanding high 5mm, it has 3 through-holes to open on the heating block 1, and wherein 1 protruding region of heating block is opened has two through-holes, is used for installing heating rod 11 and temperature sensor 12 respectively, and it has the through-hole to be close to first passageway and second passageway center meeting point department to open in the platform area for install temperature sensor 13, as shown in fig. 3 (b).
Wire material direction coupling 8's free end is the horn mouth for the polytetrafluoroethylene pipe that contains the second passageway wire material can vibrate at great within range, and can not break, the value range of horn mouth cone angle α is 30 ~ 90 the utility model discloses in the embodiment wire material direction coupling 8's horn mouth cone angle α is 60 degrees, as shown in figure 4.
The utility model discloses two-channel 3D beats printer head assembling process specifically as follows:
step 1: cutting and perforating of aerogel wrapping layer 7
Preparing a pre-oxidized fiber aerogel sheet with the thickness of 3-5 mm, cutting the aerogel sheet with a proper size according to the cross-sectional shapes of the heating blocks in different directions, and as shown in fig. 3b and 5, requiring that the splicing seams are as few as possible and the positions needing to be perforated are provided with lap joint margins.
Step 2: the surface of the heating block 1 is coated with aerogel 7
The heating block 1 is subjected to phosphoric acid anodizing surface treatment to increase the bonding strength. Sticking a 3M thermal insulation adhesive tape on one side of the cut pre-oxidized silk aerogel sheet, coating according to the sequence of figure 5, and fixedly sealing through structural adhesive to form an aerogel wrapping layer 7 shown in figure 2. In the coating and sealing process, pores and wrinkles are avoided, so that the coating and sealing process is smooth and paved, and the 3M heat-insulating adhesive tape is ensured to be larger than the aerogel area by the hole-opening area. After the aerogel wrapping layer 7 is fixed, the 3M adhesive tape is adopted to wind the whole aerogel area clockwise, so that the continuity of the heat insulation adhesive tape at the corner and the splicing part is ensured.
And step 3: heating block 1 first channel installation
As shown in fig. 6, a polyimide heat insulating mat 10 with a suitable size is processed, a fiber guide tube 3 is placed into a heating block 1 from above a first channel, a gland pipe 2 is screwed on the heating block through a center hole of the polyimide heat insulating mat 10, and a screw surface and a gap are sealed by GD414 glue. At the other end of the first channel, a spray head 6 is screwed on the heating block 1, and the outer edge of the spray head is bonded with aerogel on the surface of the heating block 1 by using a 3M adhesive tape, so that no gap is ensured.
And 4, step 4: heating block 1 second channel installation
The distance from the intersection of the first and second channels to the wire guide tube stub 8 was measured and marked on the teflon tube 9 as shown in fig. 2. The position marked teflon tube 9 is threaded through the wire guide tube stub 8 and its position is fixed. A throat pipe 4 and a radiating pipe 5 are sequentially arranged on a second channel of the heating block 1 and are in screwed connection with each other in place, and a combined body of a polytetrafluoroethylene pipe 9 and a wire material guide pipe joint 8 is inserted into the radiating pipe 5 until the deep part of the throat pipe is reached. And after the second channel is connected in place, the connecting part is sealed by GD414 glue. After the first channel and the second channel are fixedly installed on the heating block 1, the integral heating block is coated by using a 3M adhesive tape, and the assembly form shown in the figure 1 is achieved.
Examples
The power consumption of the printing head and the temperature change of different parts in working are obtained through calculation simulation and test measurement, and the heat insulation requirements of the parts in different directions are evaluated. Experiments show that: the heating block 1 of the printing head is the most main heat-generating source in all components, the printing process is always kept at high temperature, and the heating block 1 has larger external surface area and is the main radiation source, so that the establishment of the heat-insulating barrier on the surface of the printing head is the source for reducing heat dissipation. Compare the thermal insulation cotton and the glass fiber reinforced SiO2Aerogel and pre-oxidized wire reinforced SiO2The thermal-insulated effect of aerogel has tested the aerogel of 1mm, 3mm, three kinds of specifications of 5mm and the combination heat-proof quality of 3M sticky tape, and the final selected consumption to this space 3D printer pastes the thick preoxidized fiber reinforcing SiO of 5mm in heating block 1 outside2Aerogel thermal-insulated effect preferred, fixed through 5 layers of 3M sticky tape cladding. In addition, the printing head conducts heat along the direction of the wire feeding pipe, if the temperature of the guide pipe is too high, the wire is melted before entering the printing head, so that normal printing cannot be conducted, and in order to ensure that the temperature of the polytetrafluoroethylene pipe 9 is below 60 ℃, one additional heat conducting pipe is arranged outside the polytetrafluoroethylene pipe 9Annular fin cooling tube 5 has increased a polyimide heat insulating mattress 10 that 2mm is thick in gland pipe 2 and the 1 contact area of heating block to guarantee that gland pipe 2 temperature is normal.
Use the utility model discloses before the method, after 5min from grinding 3D printer start, beat printer head external temperature and rise to 90 ℃. With the continuous heating of the printing nozzle and the melting and extrusion of the material, the external temperature of the printing head reaches about 110 ℃, and the whole printing process is continued. The temperature of the printing head support is also over 50 ℃, and the heat dissipation pipe is subjected to heat conduction of air around the printing head, so that the temperature is up to 48 ℃. The temperature of each motor exceeds 40 ℃, and the temperature of the circuit board controller reaches 42 ℃. The maximum temperature of the wall plate of the self-grinding 3D printer can reach 39 ℃, and is 19 ℃ higher than the ambient temperature. These devices have excessive surface temperatures that far exceed design requirements and load carrying capabilities, and are too energy intensive. Adopt the utility model discloses afterwards, after the same start-up of 3D printer 5min from grinding, beat printer head external temperature and only rise to 48 ℃, extrude along with the continuous heating and the material melting of printing the shower nozzle, beat printer head external temperature and highest 52 ℃ that reaches to last whole printing process. The temperature of the printing head bracket is about 37 ℃, the temperature of the radiating pipe is kept within 40 ℃, and the temperature of the motor, the circuit board and the power supply side plate are all controlled below 40 ℃. The temperatures of an upper cover plate and a lower side plate of the self-grinding space 3D printer are all about 22 ℃ and are only 2 ℃ higher than the indoor temperature. More comprehensive, the utility model discloses the method obtains good performance to the local temperature control of 3D printer, and its surface temperature of printer during operation influences the under-deck ambient temperature very little to practice thrift the energy consumption, realized the high-efficient utilization of the limited energy.
Those skilled in the art will appreciate that the details of the present invention not described in detail herein are well within the skill of those skilled in the art.
Claims (7)
1. A dual-channel 3D printing head based on an aerogel wrapping layer for in-orbit use, comprising: the heat insulation pipe comprises a heating block (1), a gland pipe (2), a fiber guide pipe (3), a throat pipe (4), a radiating pipe (5), a spray head (6), an aerogel wrapping layer (7), a wire material guide pipe joint (8), a polytetrafluoroethylene pipe (9) and a polyimide heat insulation pad (10);
the heating block (1) is provided with a first passage and a second passage, and the axis of the first passage and the axis of the second passage are coplanar and intersect; the included angle theta between the first passage axis and the second passage axis ranges from 15 degrees to 60 degrees;
the first passage is a stepped through hole, one end of the first passage is connected with one end of a fiber guide pipe (3), the other end of the fiber guide pipe (3) is fixedly connected with one end of a gland pipe (2), and the other end of the gland pipe (2) extends out of the heating block (1); the gland pipe (2) is connected with the heating block (1) through threads to fix the position of the fiber guide pipe (3) in the heating block; the other end of the first passage is fixedly connected with a spray head (6);
the second passage is a stepped hole, and one end of the second passage is communicated with the first passage; the throat pipe (4), the radiating pipe (5) and the wire material guide pipe joint (8) are sequentially connected, and the end part of the throat pipe (4) is fixedly connected with the other end of the second passage;
a tapered groove is formed in the end part of the spray head (6), and a cavity enclosed by the tapered groove and the inner wall of the first passage serves as a molten pool; a polytetrafluoroethylene tube (9) is inserted into the throat (4) from the wire guide pipe joint (8) and the radiating pipe (5), and the polytetrafluoroethylene tube (9) is used for guiding thermoplastic materials into the molten pool; the continuous fiber reinforcement sequentially flows into the molten pool through the gland pipe (2) and the fiber guide pipe (3);
the intersection point of the first passage axis and the second passage axis is used as a fusion point, and the fusion point is positioned in the molten pool; the fusion point position satisfies the following proportional relation:
d1：d2：d3＝1：1：0.45，
wherein d1 is the distance from the fusion point to the intersection point of the surface of the heating block (1) and the axis of the gland pipe (2) which are vertically intersected, d2 is the distance from the fusion point to the intersection point of the surface of the heating block (1) and the axis of the throat pipe (4) which are vertically intersected, and d3 is the distance from the fusion point to the intersection point of the surface of the heating block (1) and the axis of the spray head (6) which are vertically intersected;
the inner diameter of the gland pipe (2) is larger than that of the fiber guide pipe (3), and the inner diameter of the second passage is larger than that of the fiber guide pipe (3); the inner diameter of one end, connected with the first passage, of the spray head (6) is larger than that of the second passage;
the outer wall of the heating block (1) is subjected to phosphoric acid anodizing treatment; the outer wall of heating block (1) wraps up and has aerogel parcel layer (7) that are used for thermal-insulated, the material of aerogel parcel layer (7) is for pre-oxidation silk reinforcing SiO2The thickness of the aerogel wrapping layer (7) ranges from 1mm to 5 mm;
a polyimide heat insulation pad (10) is fixed on the end face of the heating block (1) where the gland pipe (2) is installed, a central through hole is formed in the polyimide heat insulation pad (10), and the gland pipe (2) penetrates through the central through hole of the polyimide heat insulation pad (10) and is inserted into the heating block (1); and a heating rod 11 and a plurality of temperature sensors which are used for heating the heating block (1) are arranged in the heating block (1).
2. The on-orbit use dual-channel 3D printing head based on the aerogel wrapping layer as claimed in claim 1, wherein the gland pipe (2) is of a stainless steel cylindrical structure with external threads, the gland pipe (2) passes through the polyimide heat insulation pad (10) and is inserted into the heating block (1), and the fiber conduit (3) is a titanium alloy thin pipe.
3. The on-orbit aerogel cladding based dual-channel 3D printing head of claim 1, wherein the free end of the wire guide pipe joint (8) is a bell mouth, and the value of the bell mouth taper angle α ranges from 30 degrees to 90 degrees.
4. An aerogel blanket based dual channel 3D printhead for in-track use according to any of claims 1 to 3, wherein: the heating block (1) is made of aluminum alloy.
5. An in-orbit aerogel blanket based dual-channel 3D printhead as claimed in claim 4, wherein: the included angle theta between the first passage axis and the second passage axis is 45 degrees.
6. An in-orbit aerogel blanket based dual-channel 3D printhead as claimed in claim 5, wherein: the radiating pipe (5) is circumferentially provided with radiating teeth.
7. An in-orbit aerogel blanket based dual-channel 3D printhead as claimed in claim 6, wherein: the polytetrafluoroethylene tube (9) is a hollow plastic tube.
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| CN201920910840.XU CN210283271U (en) | 2019-06-18 | 2019-06-18 | Double-channel 3D printing head based on aerogel wrapping layer and used on rail |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110239095A (en) * | 2019-06-18 | 2019-09-17 | 北京卫星制造厂有限公司 | A kind of in-orbit binary channel 3D printing head based on aeroge wrapping layer used |
| CN114193658A (en) * | 2021-12-03 | 2022-03-18 | 大连理工大学 | Continuous carbon fiber 3D printing wire wrapping method and preparation system |
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2019
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110239095A (en) * | 2019-06-18 | 2019-09-17 | 北京卫星制造厂有限公司 | A kind of in-orbit binary channel 3D printing head based on aeroge wrapping layer used |
| CN110239095B (en) * | 2019-06-18 | 2024-05-03 | 北京卫星制造厂有限公司 | Double-channel 3D printing head based on aerogel wrapping layer for in-orbit use |
| CN114193658A (en) * | 2021-12-03 | 2022-03-18 | 大连理工大学 | Continuous carbon fiber 3D printing wire wrapping method and preparation system |
| NL2033658A (en) * | 2021-12-03 | 2022-12-19 | Univ Dalian Tech | Outer wrapping method and preparation system of continuous carbon fiber 3d printing wires |
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