Multi-nozzle 3D printer

Abstract

The utility model relates to a multi-nozzle 3D printer. The multi-nozzle 3D printer is of an integrated structural design integrating printing, leveling, curing and waste treatment functions. An X-axis, Y-axis and Z-axis linkage structure is adopted, a triangular three-nozzle assembly is arranged on the front side of a lifting bearing seat, a blowing device with a gradually-shrinking airflow channel and a heatable leveling roller are arranged on the rear side of the lifting bearing seat, efficient leveling and rapid curing of a printing layer are achieved, and a waste wax removing device is of a V-shaped groove clamping type scraper structure. The air blowing device is matched with a tooth groove flow guide channel and a double-heating system, solidified waste is effectively removed and recycled, the dust removal device is combined with a negative pressure dust suction pipe through an arc-shaped cover body, wax particles are synchronously collected in the operation process, the section compression ratio design of the air blowing device ranging from 3: 1 to 5: 1 is matched with a temperature feedback adjusting system, and accurate and controllable air flow output is ensured. According to the equipment, through cooperative work of multiple mechanisms, the printing precision, the material utilization rate and the cleanliness of the production environment are remarkably improved, and the equipment is particularly suitable for high-quality 3D printing scenes such as precision casting wax molds.

Description

TECHNICAL FIELD

[0001] The utility model relates to 3D printer equipment technical field especially relates to multi -jet 3D printer. BACKGROUND

[0002] In recent years, 3D printing technology is widely used in industrial design, precision casting and other fields due to its rapid prototyping, complex structure manufacturing and other advantages. Multi-jet 3D printer realizes wax mold printing by configuring multiple nozzles, further expanding the technical application scene. However, the existing technology still has the following bottlenecks in actual application: 1. Traditional equipment relies on single nozzle layer-by-layer stacking, lacks efficient interlayer leveling mechanism, and is easy to cause rough surface or weak interlayer bonding. Although some schemes introduce leveling rollers, they do not combine temperature control and air flow assistance, so it is difficult to simultaneously realize uniform material spreading and rapid solidification; 2. In the scene of wax mold printing, the waste wax removed by the scraper is easy to adhere to the leveling roller or fall into the device, and the traditional collection device lacks anti-solidification design and efficient flow guide structure, resulting in difficult cleaning, material waste and device pollution; 3. Dust or small particles generated during printing and leveling process are easy to diffuse to the working environment, affecting printing accuracy and operator health, and the existing equipment is not integrated with an active dust removal system.

[0003] In view of the above problems, the existing technology tries to improve by optimizing the nozzle path and adding auxiliary heating, but the leveling, solidification, waste treatment and environmental control links still lack systematic integration. Therefore, there is an urgent need for a multi-jet 3D printing device that integrates high-precision printing, intelligent leveling and solidification, efficient waste recovery and environmental purification, to break through the limitations of existing technology and meet the needs of high-quality scenarios such as precision manufacturing. SUMMARY

[0004] In view of the existing problems, the utility model provides a multi-jet 3D printer, which significantly improves the printing accuracy, material utilization rate and cleanliness of the production environment through the cooperative work of multiple mechanisms.

[0005] The utility model provides a multi-jet 3D printer, which comprises:

[0006] A base platform has an X-axis linear guide rail extending along the X-axis direction on its surface, and a reciprocating printing platform is slidably connected to the X-axis linear guide rail;

[0007] A support frame is vertically fixed in the middle region of the base platform and extends upward along the Z-axis direction, and Z-axis linear guide rails are symmetrically arranged on the inner side of the support frame;

[0008] A bearing seat is assembled on the Z-axis linear guide rail in a lifting manner;

[0009] A printing nozzle is installed on the front side working surface of the bearing seat through a Y-axis linear guide rail;

[0010] The leveling solidification mechanism comprises:

[0011] The leveling roller is rotatably mounted to the rear side working surface of the bearing seat through a bearing block, and the rotation axis of the leveling roller is parallel to the Y-axis direction.

[0012] The air blowing device is arranged behind the leveling roller in the Y-axis direction, and a tapered airflow channel is arranged in the air blowing device. An air outlet slit is formed at the end of the airflow channel, the extension direction of the air outlet slit is parallel to the axial direction of the leveling roller, and the airflow emission direction is inclined away from the leveling roller to form an acute angle of 20-40° with the surface of the printing platform.

[0013] Preferably, the device further comprises a waste wax removal device for removing and collecting the residual wax on the leveling roller, which comprises:

[0014] The scraper has a blade edge in contact with the surface of the leveling roller and a scraping direction opposite to the rotation direction of the leveling roller.

[0015] The fixed seat is composed of a base and an upper seat, the base is provided with a V-shaped groove in the length direction, the upper seat is fitted into the V-shaped groove, and the bottom of the scraper is clamped and fixed between the inner wall of one side of the V-shaped groove and the upper seat.

[0016] The flow guide structure comprises a plurality of upper tooth grooves arranged on the upper seat, a drainage hole penetrating the bottom wall of the upper tooth groove, and a flow guide hole arranged on the other side of the V-shaped groove, and the drainage hole and the flow guide hole are communicated to form a waste wax flow guide channel.

[0017] The collection groove is located below the fixed seat and is communicated with the outlet end of the flow guide hole for receiving the waste wax discharged from the flow guide channel.

[0018] Preferably, a plurality of lower tooth grooves are arranged on the side wall of the V-shaped groove of the base connected with the scraper, and the lower tooth grooves correspond to the upper tooth grooves of the upper seat for guiding the removed waste wax into the collection groove.

[0019] Preferably, a cavity is arranged along the axial direction of the leveling roller, and a first heating pipe is arranged in the cavity for heating and maintaining the working temperature of the leveling roller.

[0020] Preferably, a second heating pipe is arranged at the lower part of the outer side wall of the collection groove, and the heating area of the second heating pipe corresponds to the waste wax collection area of the collection groove for preventing the waste wax from solidifying in the collection groove.

[0021] Preferably, the device further comprises a dust removal device, which comprises: an arc-shaped cover body, the inner arc surface of which maintains a gap of 3-5mm with the scraping surface of the leveling roller; a vertical fixed part arranged on one side of the arc-shaped cover body and connected with the upper end of the bearing block of the leveling roller through bolts; and a horizontal extension part arranged on the other side of the arc-shaped cover body, the distal end of which covers more than 2 / 3 of the opening area of the collection groove.

[0022] Preferably, the top end of the arc-shaped cover body is provided with a plurality of dust suction ports, each of which is connected to a dust suction pipe through a short pipe, the dust suction pipe is arranged in parallel with the arc-shaped cover body, and one end of the dust suction pipe is connected to an external negative pressure equipment through a connecting pipe.

[0023] Preferably, the tapering airflow channel of the air blowing device has a cross-section compression ratio of 3:1 to 5:1.

[0024] Preferably, a plurality of temperature sensors are arranged at the air outlet slits at the end of the airflow channel, for real-time monitoring of the air outlet temperature, and dynamically adjusting the rotating speed of the air inlet fan according to the temperature change.

[0025] Preferably, the printing nozzle comprises a bottom plate, and three nozzles are arranged in a triangular shape on the bottom plate.

[0026] The multi-nozzle 3D printer has the following technical effects:

[0027] 1. The combination of the leveling roller and the tapering air blowing device realizes heat pressing and leveling of the printing layer by the leveling roller (which can be heated), and the combination of the air blowing device and the directional inclined airflow (20-40° acute angle) realizes uniform material spreading and rapid cooling and solidification, significantly improves the interlayer bonding strength and surface finish, and reduces warping deformation.

[0028] 2. The waste wax removal device adopts a V-shaped groove clamping type scraper structure, cooperates with an up-down tooth groove flow guide channel, reduces waste wax splashing, cooperates with a double heating system (a first heating pipe in the leveling roller and a second heating pipe outside the collection groove), ensures that the waste wax is effectively scraped off, prevents solidification and blockage, and is accurately recycled to the collection groove through the flow guide hole, reduces material waste and equipment pollution.

[0029] 3. The triangular distribution of three nozzles optimizes the space utilization rate, cooperates with XYZ three-axis linkage control, avoids motion interference, dynamically adjusts the working state of the nozzle, and improves the forming efficiency and precision of complex structures.

[0030] 4. The dust removal device is linked with the arc-shaped cover body and the negative pressure dust suction pipe to collect dust and small particles synchronously during the leveling process, avoids diffusion and pollution of the working environment, and ensures the printing precision and the health of the operator.

[0031] 5. The tapering airflow channel (3:1 to 5:1 compression ratio) cooperates with the temperature sensor to realize real-time feedback, dynamically adjusts the air speed and temperature, ensures uniform and stable airflow, improves energy utilization efficiency, and the heating design of the leveling roller and the collection groove further adapts to the characteristics of wax and other heat-sensitive materials, prevents solidification or excessive softening.

[0032] 6. The leveling solidification, waste removal, dust removal and other functional modules are highly integrated in the bearing seat and the support frame, compact structure and easy to disassemble and maintain, reduce the equipment operation and maintenance cost.

[0033] By the multi-agency collaborative optimization, the utility model is superior to traditional equipment in printing precision, interlayer quality, material utilization, environmental friendliness and equipment reliability. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, the following will briefly introduce the drawing needed to be used in the embodiment or prior art description, obviously, the drawing in the following description is only some embodiments of the utility model, for ordinary skilled person in the art, under the premise of not paying the creativity labor intensity, other drawings can also be obtained according to these drawings.

[0035] Figure 1 It is the structure schematic diagram of the multi-nozzle 3D printer of the embodiment of the utility model;

[0036] Figure 2 It is another view structure schematic diagram of the multi-nozzle 3D printer of the embodiment of the utility model;

[0037] Figure 3 It is the structure schematic diagram of the whole machine of the multi-nozzle 3D printer of the embodiment of the utility model;

[0038] Figure 4 It is the partial structure schematic diagram of the multi-nozzle 3D printer of the embodiment of the utility model;

[0039] Figure 5 It is another view structure schematic diagram of Figure 4 ;

[0040] Figure 6 It is the working state schematic diagram of the blowing device of the multi-nozzle 3D printer of the embodiment of the utility model;

[0041] Figure 7 It is the structure schematic diagram of the blowing device of the multi-nozzle 3D printer of the embodiment of the utility model;

[0042] Figure 8 It is the partial structure schematic diagram of the blowing device of the multi-nozzle 3D printer of the embodiment of the utility model;

[0043] Figure 9 It is the structure schematic diagram of the waste removal device and dust removal device of the multi-nozzle 3D printer of the embodiment of the utility model;

[0044] Figure 10 It is the structure schematic diagram of the waste removal device of the multi-nozzle 3D printer of the embodiment of the utility model;

[0045] Figure 11 is the flattening roller, fixed seat and scraper structure schematic view of the multi-nozzle 3D printer of the embodiment of the utility model;

[0046] Figure 12 is the fixed seat and scraper structure schematic view of the multi-nozzle 3D printer of the embodiment of the utility model;

[0047] Figure 13 is the dust removal device structure schematic view of the multi-nozzle 3D printer of the embodiment of the utility model.

[0048] Reference signs: base platform 1, X-axis linear guide rail 2, printing platform 3, support frame 4, Z-axis linear guide rail 5, bearing seat 6, printing nozzle 7, bottom plate 701, nozzle 702, flattening and curing mechanism 8, flattening roller 81, first heating pipe 8101, bearing seat 82, blowing device 83, airflow channel 831, air outlet slit 832, fan 833, temperature sensor 834, waste wax removal device 9, scraper 91, fixed seat 92, base 921, V-shaped groove 921a, flow guide hole 921b, lower tooth groove 921c, upper seat 922, upper tooth groove 922a, drainage hole 922b, collection groove 93, second heating pipe 9301, dust removal device 10, arc-shaped cover body 101, vertical fixing part 102, horizontal extension part 103, short pipe 104, dust suction pipe 105

[0049] Figure 1 X-Y-Z are three-axis coordinate system. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0051] Please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 The multi-nozzle 3D printer of the embodiment comprises a base platform 1, the upper surface of the base platform 1 is provided with an X-axis linear guide rail 2 extending along the X-axis direction, and a reciprocating printing platform 3 is slidably connected to the X-axis linear guide rail 2, and the printing platform 3 is driven to reciprocate along the X-axis by a servo motor and a synchronous belt.

[0052] The support frame 4 is vertically fixedly arranged in the middle region of the base platform 1 and extends upward along the Z-axis direction, in the shape of a square frame, the bottom frame of which is fixedly connected with the base platform 1, and the bottom frame and the X-axis linear guide rail 2 are in a cross-shaped structure, and the two side frames of the support frame 4 are symmetrically provided with Z-axis linear guide rails 5. The Z-axis linear guide rails 5 are provided with a liftable bearing seat 6, and the slider of the Z-axis linear guide rail 5 is driven by a stepping motor located on the top frame of the support frame 4, and the bearing seat 6 is driven to move up and down.

[0053] The print head 7 is mounted on the front side working surface of the bearing seat 6 through the Y-axis linear guide rail, and includes a bottom plate 701 and three print heads 702 arranged in a triangular shape, and the print heads 702 are adjusted in temperature by independent temperature control modules.

[0054] The leveling and curing mechanism 8 is arranged on the rear side of the bearing seat 6, and includes a leveling roller 81 and a blowing device 83. The leveling roller 81 can be made of aluminum alloy or ceramic material, and a cavity is formed in the inside along the axial direction, and a first heating pipe 8101 is embedded in the cavity for heating and maintaining the working temperature of the leveling roller 81. The leveling roller 81 is rotatably mounted on the rear side working surface of the bearing seat 6 through a bearing seat 82, and the rotation axis of the leveling roller 81 is parallel to the Y-axis direction, and the leveling roller 81 is driven to rotate by a servo motor, and the rotating speed is adjustable.

[0055] As shown in Figure 6 , Figure 7 and Figure 8 , the blowing device 83 is arranged in the rear of the leveling roller 81 parallel to the Y-axis direction, and a tapered airflow channel 831 is arranged in the inside of the shell, and the ratio of the inlet cross-sectional area to the outlet cross-sectional area (compression ratio) is 3:1 to 5:1. The airflow channel 831 forms an air outlet slit 832 at the end, the extension direction of the air outlet slit 832 is parallel to the axial direction of the leveling roller 81, and the airflow emission direction is inclined away from the leveling roller 81, forming an acute angle a of 20-40° (preferably 30°) with the surface of the printing platform 3, the air is supplied by a fan 833, and the fan speed is adjustable. A plurality of temperature sensors 834 are arranged at the air outlet slit 832 to monitor the outlet air temperature in real time, and the rotating speed of the inlet fan is dynamically adjusted according to the temperature change.

[0056] As shown in Figure 9 , Figure 10 , Figure 11 and Figure 12 , the waste wax removal device 9 is used to remove and collect the residual wax on the leveling roller 81, which includes a scraper 91, a fixed seat 92 and a collection groove 93.

[0057] The scraper 91 is made of hard alloy material, the cutting edge is in contact with the surface of the leveling roller 81, and the scraping direction is opposite to the rotating direction of the leveling roller.

[0058] The fixed seat 92 is composed of a base 921 and an upper seat 922. The base 921 is provided with a V-shaped groove 921a along the length direction, and the upper seat 922 is fitted in the V-shaped groove 921a. The bottom of the scraper 91 is clamped and fixed between the V-shaped groove 921a and the upper seat 922 by screw locking. A plurality of lower tooth grooves 921c are formed in the side wall of the V-shaped groove 921a connected with the scraper 91, and a plurality of upper tooth grooves 922a are arranged on the upper seat 922. The lower tooth grooves 921c correspond to the upper tooth grooves 922a, and the bottom wall of each upper tooth groove 922a is provided with a drainage hole 922b. A drainage hole 921b is arranged on the other side wall of the V-shaped groove 921a of the base 921 away from the scraper 91. The drainage hole 922b and the drainage hole 921b are communicated to form a waste wax drainage channel, that is, a drainage structure of the cleaning device.

[0059] A collection groove 93 is arranged below the fixed seat 92 and is communicated with the outlet end of the drainage hole 921b. The collection groove 93 is used for receiving the waste wax discharged from the drainage channel. A second heating pipe 9301 is arranged on the lower part of the outer side wall of the collection groove 93. The heating area of the second heating pipe 9301 corresponds to the waste wax collection area of the collection groove 93, and is used for preventing the waste wax from solidifying in the collection groove 93.

[0060] As shown in Figure 9 and Figure 13 The dust removal device 10 includes an arc-shaped cover body 101. The inner arc surface of the arc-shaped cover body 101 is kept at a gap of 3-5 mm with the scraping surface of the leveling roller 81, and covers the scraping area of the leveling roller 81. A vertical fixed part 102 is arranged on one side of the arc-shaped cover body 101 and is connected with the upper end of the bearing seat 82 of the leveling roller 81 through a bolt, so as to ensure that the arc-shaped cover body 101 moves synchronously with the leveling roller 81. A horizontal extension part 103 is arranged on the other side of the arc-shaped cover body 101. The distal end of the horizontal extension part 103 covers more than 2 / 3 of the opening of the collection groove 90. A plurality of dust suction ports are arranged on the top end of the arc-shaped cover body 101. Each dust suction port is connected with a dust suction pipe 105 through a short pipe 104. The dust suction pipe 105 is arranged in parallel with the arc-shaped cover body 101, and one end of the dust suction pipe 105 is communicated with an external negative pressure equipment through a connecting pipe.

[0061] Workflow:

[0062] 1. Printing stage: The printing platform moves to below the nozzle along the X axis, and the three nozzles extrude the molten wax material according to the preset path to form a printing layer.

[0063] 2. Leveling and solidification stage: The bearing seat is lowered to contact the surface of the printing layer, the leveling roller rotates, the first heating pipe maintains the working temperature of the roller body, and the wax layer is hot-pressed and leveled; the air blowing device synchronously outputs airflow, and the inclined airflow accelerates the cooling and solidification of the wax layer, while avoiding interference with the leveling roller.

[0064] 3. Waste removal stage: the scraper removes the residual waste wax on the surface of the leveling roller, the waste wax is guided to the drainage hole through the upper and lower tooth grooves, flows into the collection tank through the drainage hole, and the second heating pipe maintains the temperature of the collection tank to keep the waste wax fluidity.

[0065] 4. Environmental purification stage: the negative pressure equipment is started, the dust raised in the leveling process is sucked through the dust suction port, and is discharged after being filtered through the dust suction pipe.

[0066] The embodiment realizes high integration of printing, leveling, waste recycling and dust removal functions through modular design, the leveling roller and the blowing device cooperate to reduce the surface roughness of the wax layer to Ra≦1.6 microns, the waste wax recycling rate is more than 95%, the dust emission amount is reduced by 80%, and the forming quality and production efficiency of the precision casting wax mold are significantly improved.

[0067] The above only describes the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A multi-nozzle 3D printer, characterized in that, include: The base platform (1) has an X-axis linear guide (2) extending along the X-axis direction on its surface, and a reciprocating printing platform (3) is slidably connected to the X-axis linear guide (2). The support frame (4) is vertically fixed in the middle area of ​​the base platform (1) and extends upward along the Z-axis direction. A Z-axis linear guide rail (5) is symmetrically arranged on its inner side. The support base (6) is mounted on the Z-axis linear guide (5) in a height-adjustable manner; The printing nozzle (7) is mounted on the front working surface of the bearing seat (6) via a Y-axis linear guide rail; The leveling and curing mechanism (8) includes: The leveling roller (81) is rotatably mounted on the rear working surface of the bearing seat (6) via a bearing seat (82), and the rotation axis of the leveling roller (81) is parallel to the Y-axis direction; An air blowing device (83) is provided behind the leveling roller (81) along the Y-axis direction. It has a gradually narrowing airflow channel (831) inside. An air outlet slit (832) is formed at the end of the airflow channel (831). The extension direction of the air outlet slit (832) is parallel to the axial direction of the leveling roller (81), and the airflow ejection direction is inclined away from the leveling roller (81), forming an acute angle of 20-40° with the surface of the printing platform (3).

2. The multi-nozzle 3D printer according to claim 1, characterized in that, It also includes a waste wax removal device (9) for removing and collecting residual wax on the leveling roller (81), which includes: The scraper (91) has its cutting edge in contact with the surface of the leveling roller (81) and the scraping direction is opposite to the rotation direction of the leveling roller (81); The fixed seat (92) is assembled from a base (921) and an upper seat (922). The base (921) has a V-groove (921a) along its length. The upper seat (922) is fitted into the V-groove (921a). The scraper (91) is clamped and fixed at the bottom between the inner wall of one side of the V-groove (921a) and the upper seat (922). The flow guiding structure includes multiple upper toothed grooves (922a) provided on the upper seat (922), a flow guiding hole (922b) penetrating the bottom wall of the upper toothed groove (922a), and a flow guiding hole (921b) provided on the inner wall of the other side of the V-shaped groove (921a). The flow guiding hole (922b) and the flow guiding hole (921b) are connected to form a waste wax flow guiding channel. The collection tank (93) is located below the fixed base (92) and connected to the outlet end of the guide hole (921b) to receive the waste wax discharged from the guide channel.

3. The multi-nozzle 3D printer according to claim 2, characterized in that, The V-shaped groove (921a) of the base (921) is connected to the scraper (91) and a plurality of lower tooth grooves (921c) are provided on the side wall. The lower tooth grooves (921c) correspond to the upper tooth grooves (922a) of the upper seat (922) and are used to guide the removed waste wax into the collection tank (93).

4. The multi-nozzle 3D printer according to claim 3, characterized in that, The leveling roller (81) has a cavity along its axial direction, and a first heating tube (8101) is provided in the cavity. The first heating tube (8101) is used to heat the leveling roller (81) and maintain its working temperature.

5. The multi-nozzle 3D printer according to claim 4, characterized in that, A second heating pipe (9301) is provided on the lower part of the outer wall of the collection tank (93). The heating area of ​​the second heating pipe (9301) corresponds to the waste wax collection area of ​​the collection tank (93) to prevent the waste wax from solidifying in the collection tank (93).

6. The multi-nozzle 3D printer according to claim 2, characterized in that, It also includes a dust removal device (10), which includes: an arc-shaped cover (101) with its inner arc surface maintaining a 3-5mm gap with the scraping surface of the leveling roller (81); a vertical fixing part (102) extending from one side of the arc-shaped cover (101) and connected to the upper end of the bearing seat (82) of the leveling roller (81) by bolts; and a horizontal extension part (103) extending from the other side of the arc-shaped cover (101) with its far end covering more than 2 / 3 of the area of ​​the opening of the collection trough (93).

7. The multi-nozzle 3D printer according to claim 6, characterized in that, The top of the arc-shaped cover (101) is provided with multiple dust suction ports. Each dust suction port is connected to a dust suction pipe (105) through a short pipe (104). The dust suction pipe (105) is arranged parallel to the arc-shaped cover (101), and one end of the dust suction pipe (105) is connected to an external negative pressure device through a connecting pipe.

8. The multi-nozzle 3D printer according to claim 1, characterized in that, The cross-sectional compression ratio of the gradually narrowing airflow channel (831) of the blowing device (83) is 3:1 to 5:

1.

9. The multi-nozzle 3D printer according to claim 8, characterized in that, Multiple temperature sensors (834) are installed at the air outlet slit (832) at the end of the airflow channel (831) to monitor the air outlet temperature in real time and dynamically adjust the speed of the intake fan (833) according to the temperature change.

10. The multi-nozzle 3D printer according to claim 1, characterized in that, The printing nozzle (7) includes a base plate (701), on which three nozzles (702) are arranged in a triangular pattern.

Images