TWI704993B - 3d printing head having electrically descendible nozzle - Google Patents

Abstract

A 3D printing head having an electrically descendible nozzle is provided and the 3D printing head has a carrier, a couple of nozzle assemblies, a swing arm and a driving mechanism. The nozzle assemblies are arranged on the carrier. Each nozzle assembly has a nozzle and a reset elastic member. Each nozzle is connected to the carrier and up-down movable relative to the carrier. The respective reset elastic members are connected between the carrier and the respective corresponding nozzles for lifting the respective nozzles relative to the carrier. The swing arm is pivoted on the carrier, and the swing arm can swing to move one end thereof between the nozzles to selectively press one of the nozzles down. The driving mechanism is connected with swing arm to rotate the swing arm. The swing arm can be rotated by the driving mechanism to press the operated nozzle down for printing, and a height difference between the nozzles is thereby formed to prevent the product from being scratched by the idle nozzle when printing.

Description

3D print head with electric nozzle

The invention relates to a 3D printing device, in particular to a dual-nozzle 3D printing head with electric nozzles.

The present invention relates to a 3D printing device, especially a fused deposition type FDM (Fused Deposition Modeling) 3D printing device. The plastic filament is melted by a heated nozzle and then extruded at a predetermined position and cooled and solidified to form. The print head of the current FDM printing device can be equipped with dual nozzles for printing different colors of plastic. When printing, the dual nozzles move with the print head at the same time. Once one of the nozzles is idle and the other nozzle passes over the finished product, the finished product will be scratched.

In view of this, the inventor of the present invention focused on the above-mentioned prior art, especially concentrated research and the application of scientific theory, and tried to solve the above-mentioned problems, which became the goal of the present inventor's improvement.

The invention provides a 3D printing head with an electric nozzle capable of lifting.

In the embodiment of the present invention, a 3D printing head with a nozzle that can be powered up and down includes a carrier, a pair of nozzle assemblies, a swing arm, and a driving mechanism. The nozzle assembly is arranged on the carrier. Each nozzle assembly includes a nozzle and a reset elastic member. Each nozzle is movably connected to the carrier and can move up and down relative to the carrier. Each reset elastic member is connected to the carrier and the corresponding The nozzles can be lifted relative to the carrier respectively. The swing arm is pivotally connected to the carrier, and the swing arm can swing so that one end of the swing arm can move between the nozzles and can selectively push against one of the nozzles to lower it. The drive mechanism links the swing arm to drive the swing arm to rotate and swing.

In the embodiment of the present invention, the pivot point of the swing arm and the carrier is located between the pair of nozzles. An auxiliary steering elastic member is respectively connected between the two sides of the swing arm and the carrier to assist the steering of the swing arm. A positioning elastic piece is connected between the swing arm and the carrier, and the positioning elastic piece drives the swing arm to press and fix the descending nozzle. The positioning elastic piece swings with the swing arm and the connection point between the positioning elastic piece and the carrier is located between the pair of nozzles.

In the embodiment of the present invention, the carrier includes a housing and a carrier housed in the housing, the pair of nozzle assemblies are housed in the housing and the pair of nozzles are respectively movably connected to the carrier. The carrier is provided with a positioning hole, which is a straight-through hole or a tapered hole corresponding to the shape of the nozzle. When the nozzle is lowered, the housing is exposed through the positioning hole, and the lower tip of the nozzle is positioned against the inner edge of the positioning hole .

In the embodiment of the present invention, each nozzle is provided with a pressure plate, and the edge of the pressure plate forms a slope surface, and the swing arm can move to the corresponding pressure plate through any slope surface to press the corresponding nozzle.

In the embodiment of the present invention, the swing arms can be plural and coaxially rotate in conjunction with each other. In the embodiment of the present invention, a guide wheel can be pivoted on the swing arm to selectively push against one of the nozzles.

In the embodiment of the present invention, the driving mechanism may include a power shaft and a driving gear sleeved on the power shaft, a rack is provided on the swing arm, and the rack extends in an arc shape with the pivot center of the swing arm as the center , And the drive gear meshes with the rack so that the power shaft can drive the swing arm to swing within the extended arc range of the rack.

In the embodiment of the present invention, the driving mechanism may include a power shaft and a pair of driving gears. The power shaft passes through each driving gear and the power shaft and the pair of driving gears are power connected by a steering clutch mechanism. The steering clutch mechanism includes A pair of spiral springs corresponding to each drive gear. The pair of spiral springs are sleeved outside the power shaft and are respectively fixedly connected to the corresponding drive gears. A pair of racks is provided on the swing arm corresponding to each drive gear, and each rack has a swing arm. The pivoting center is the center and extends in an arc shape, and each drive gear meshes with each rack. When the power shaft rotates in any direction, it can drive the pair of coil springs to reverse twist and make one of the coil springs radially contract and bind. The power shaft is tightened and the other coil spring expands radially to loosen the power shaft, so that the power shaft can be driven by the drive gears to drive the swing arm to swing in both directions within the extension arc range of each rack. One end of each coil spring is fixedly connected to each corresponding driving tooth, and each coil spring is fixedly connected to each corresponding driving gear with different ends.

In the embodiment of the present invention, the swing arm is pivoted on the carrier with a pivot shaft, the pivot shaft is pivotally connected to the carrier, and the pivot shaft is connected to the swing arm. The pivot shaft is sleeved with a compression spring and compresses The two ends of the spring abut against the carrier and the swing arm respectively.

In the embodiment of the present invention, a lifting rail is provided on the carrier, and each nozzle assembly is respectively provided with a guiding structure that engages the lifting rail.

The 3D print head with the nozzle capable of being lifted and lowered by electric power of the present invention can be driven by its driving mechanism to push the swing arm to rotate, thereby pushing the nozzle to be used down for printing. Therefore, with a simple structure, the nozzle can be raised and lowered to create a height difference between the two nozzles, and the printed product can be prevented from being scratched by the idle nozzle during printing.

Referring to FIGS. 1 to 6, a first embodiment of the present invention provides a 3D printing head with electric nozzles capable of lifting and lowering, which at least includes a carrier 100, a pair of nozzle assemblies 200, a swing arm 300 and a driving mechanism 400.

As shown in FIGS. 1 and 6, the carrier 100 is used to connect a horizontal sliding rail 10 so that the 3D print head with the nozzle of the present invention capable of being electrically lifted can slide horizontally along the horizontal sliding rail 10. Specifically, the carrier 100 includes at least a housing 110 and a carrier 120 accommodated in the housing 110. In this embodiment, preferably, the carrier 120 is made of plastic and the housing 110 is a combination of bent metal sheets Constitution, but the present invention is not limited thereto. One side of the housing 110 is connected to the horizontal slide rail 10. Specifically, the housing 110 can be indirectly connected to the horizontal slide rail 10 by a plastic member according to actual configuration requirements.

As shown in FIGS. 1, 2, 5 and 6, the nozzle assembly 200 is accommodated in the housing 110, and the nozzle assembly 200 is disposed on the carrier 100. Each nozzle assembly 200 includes a nozzle 210 and a reset elastic member 201, and each nozzle 210 is respectively movably connected to the carrier 100 and can move up and down relative to the carrier 100. The pair of nozzles 210 are respectively connected to the carrier 120 movably up and down. Specifically, each nozzle 210 has a feeding tube 211. The top end of the feeding tube 211 movably penetrates the carrier 120 vertically, and the lower end of the feeding tube 211 is provided with The heater 212 melts the filament input from the feeding pipe 211, and the molten filament is extruded downward through the lower end of the feeding pipe 211. Each reset elastic member 201 is respectively connected between the carrier 100 and the corresponding nozzle 210 and can lift each nozzle 210 with respect to the carrier 100 respectively. In this embodiment, each reset elastic member 201 is a cylindrical spring sleeved on the top end of each feeding tube 211, and the top end of each reset elastic member 201 abuts against the feeding tube 211 sleeved, and the lower part of each reset elastic member 201 It abuts on the top surface of the carrier 120. The carrier 100 is provided with lifting guide rails 130a/130b, and its installation position is not limited in the present invention. In this embodiment, the carrier 120 is provided with lifting guide rails 130a, and the housing 110 is also provided with lifting guide rails 130b. Each nozzle assembly 200 is respectively provided with a guiding structure 230a/230b correspondingly engaged with each lifting rail 130a/130b. The guide structure 230a/230b guides each nozzle assembly 200 to move up and down along each lifting rail 130a/130b.

As shown in Figures 1 to 4 and 6, the swing arm 300 is pivotally connected to the carrier 100. The swing arm 300 can swing so that the lower end of the swing arm 300 can move between the pair of nozzles 210 and can selectively push against one of the nozzles. 210 and make it drop. Specifically, the swing arm 300 is pivoted on the carrier 100 with a pivot shaft 310. The pivot shaft 310 is transversely and penetrates the carrier 120 and is pivotally connected to the carrier 100. One end of the pivot shaft 310 is fixed through The swing arm 300 is connected so that the swing arm 300 can swing around the pivot shaft 310 as the center. A compression spring 320 is sleeved on the pivot shaft 310, and the two ends of the compression spring 320 respectively abut against the carrier 120 of the carrier 100 and the swing arm 300 to generate friction to fix the swing position of the swing arm 300. Preferably, the pivot point of the swing arm 300 and the carrier 100 is located between the pair of nozzles 210, and the lower end of the swing arm 300 is pivotally provided with a guide wheel 330 to facilitate the movement of the nozzle along the surface of the nozzle 210 from the side of the nozzle 210 The top surface of 210 can further push down the nozzle 210.

As shown in FIGS. 2 to 4 and 6, the driving mechanism 400 links the swing arm 300 to rotate the swing arm 300 to push the corresponding one of the nozzles 210 down. In this embodiment, the driving mechanism 400 includes a motor 410, a power shaft 420 connected to the motor 410, and a driving gear 430 disposed on the power shaft 420. A rack 301 is provided on the swing arm 300, and the rack 301 is configured to swing The pivoting center of the arm 300 extends in an arc as the center, and the driving gear 430 directly engages the rack 301. When the motor 410 rotates, the torque of the motor 410 overcomes the friction force to drive the swing arm 300 to swing within the extended arc range of the rack 301.

An auxiliary steering elastic member 440 is respectively connected to two opposite sides of the swing arm 300 along its swing direction to connect with the carrier 100, so that the auxiliary drive gear 430 of the swing arm 300 is pulled to engage the rack 301 to facilitate steering. Moreover, a positioning elastic member 450 is connected between the swing arm 300 and the carrier 100, and the positioning elastic member 450 drives the swing arm 300 to press against and fix the nozzle 210 that is descending. Specifically, in this embodiment, the positioning elastic member 450 is preferably a long coil spring. The lower end of the positioning elastic member 450 is connected to the carrier 100, and the upper end of the positioning elastic member 450 is connected to the swing arm 300. The swing arm 300 swings and the connection point between the positioning elastic member 450 and the carrier 100 is located between the pair of nozzles 210. Therefore, no matter the swing arm 300 swings to any direction of its bidirectional stroke, the positioning elastic member 450 can press the swing arm 300 down by its contraction force. Preferably, when the printing is finished, the swing arm 300 can be selectively moved between the pair of nozzles 210 as shown in FIG. 7 so that each nozzle 210 is lifted upward to facilitate 3D printing in which the nozzles of the present invention can be lifted electrically. Head back away from the finished product.

1, 5, and 6, in this embodiment, each nozzle 210 is preferably provided with a pressure plate 220, the edge of the pressure plate 220 forms a slope 221, the lower end of the swing arm 300 moves the nozzle from the side of the nozzle 210 During the process of the top surface of 210, the slope surface 221 can facilitate the passage of the lower end of the swing arm 300 to move onto the corresponding pressing plate 220 to thereby press down the corresponding nozzle 210. In this embodiment, the guiding structures 230a/230b are preferably integrally connected with the pressing plate 220.

2 and 3, in the simplest embodiment, only a single swing arm 300 with a rack 301 is needed to achieve the effect of pressing down the nozzle 210, but the present invention does not limit the number of swing arms 300. In this embodiment, a pair of swing arms 300 are preferably configured, and the pair of swing arms 300 are respectively connected to two ends of the pivot shaft 310, and the pair of swing arms 300 are coaxially rotated by the pivot shaft 310 in mutual linkage. Moreover, as long as a rack 301 is provided on one of the swing arms 300, the pair of swing arms 300 can be meshed and linked with the driving mechanism 400 through the rack 301.

As shown in the figures of this embodiment, the 3D printing head with the nozzles of the present invention that can be electrically lifted can be driven by the driving mechanism 400 to rotate the swing arm 300 to push the nozzle 210 to be used down to print. Therefore, with a simple structure, the nozzle 210 can be raised and lowered so that a height difference is generated between the two nozzles 210, and the printed product can be prevented from being scratched by the idle nozzle 210 during printing.

Referring to FIGS. 10 to 16, a second embodiment of the present invention provides a 3D printing head with electric nozzles capable of lifting and lowering the nozzles. The 3D printing head includes at least a carrier 100, a pair of nozzle assemblies 200, a swing arm 300 and a driving mechanism 400. Its structure is roughly the same as that of the first embodiment. The similarities between this embodiment and the first embodiment will not be repeated here. The differences between this embodiment and the first embodiment will be described in detail later.

The main difference between this embodiment and the first embodiment lies in the way of meshing and linkage between the swing arm 300 and the driving mechanism 400. In this embodiment, the driving mechanism includes a motor 410, a power shaft 420 connected to the motor 410, and a pair of driving gears 430a/430b arranged on the power shaft 420. The power shaft 420 passes through the driving gears 430a/430b and drives The shaft 420 and the pair of driving gears 430a/430b are powered by a steering clutch mechanism 500. The steering clutch mechanism 500 includes a pair of coil springs 510a/510b corresponding to each drive gear 430a/430b. The pair of coil springs 510a/510b are sleeved outside the power shaft 420 and are respectively fixed to the corresponding drive gears 430a/430b. A pair of racks 301a/301b are provided on the arm 300 corresponding to the driving gears 430a/430b, and the racks 301a/301b are respectively staggered and extended in an arc around the pivot center of the swing arm 300, and each driving gear 430a/430b Engage the corresponding racks 301a/301b respectively. In this embodiment, each drive gear 430a/430b preferably indirectly meshes with the corresponding rack 301a/301b through the reduction gear 460, but each drive gear 430a/430b can also directly mesh with the corresponding rack. 301a/301b, the present invention is not limited to this. When the power shaft 420 rotates in either direction, the pair of coil springs 510a/510b can be driven to reverse torsion, so that one of the coil springs 510a/510b is radially contracted to tighten the power shaft 420 and the other coil spring 510a/510b is reduced in diameter. When the power shaft 420 is driven by the drive gears 430a/430b to drive the swing arm 300 to swing in both directions within the extended arc range of the corresponding racks 301a/301b, the power shaft 420 can assist the drive gears. 430a/430b meshes with corresponding racks 301a/301b to facilitate steering.

In this embodiment, in the simplest implementation, only a single swing arm 300 with a rack 301/301b is required to achieve the effect of pressing down the nozzle 210, but the present invention does not limit the number of swing arms 300 . In this embodiment, a pair of swing arms 300 are preferably configured, and the pair of swing arms 300 are respectively connected to two ends of the pivot shaft 310, and the pair of swing arms 300 are coaxially rotated by the pivot shaft 310 in mutual linkage. Moreover, as long as one of the swing arms 300 is provided with a rack 301a/301b, the pair of swing arms 300 can be meshed and linked with the driving mechanism 400 through the rack 301a/301b.

One end of each coil spring 510a/510b is fixed to the corresponding driving gear 430a/430b, and each coil spring 510a/510b is fixed to the corresponding driving gear 430a/430b at different ends. In this embodiment, specifically, one end of each coil spring 510a/510b closer to the motor is the inner end 511a/511b, and the other end is the outer end 512a/512b. The coil spring 510a is fixed to the corresponding driving gear 430a with its inner end 511a, and the other coil spring 510b is fixed to the corresponding driving gear 430b with its outer end 512b. Thereby, when the power shaft 420 rotates in any direction, the pair of coil springs 510a/510b can be driven to rotate in opposite directions.

Therefore, the 3D printing head with the nozzles of this embodiment that can be powered up and down can use the driving mechanism 400 to push the swing arm 300 to rotate, thereby pushing the nozzle 210 to be used down for printing, thereby causing a height difference between the two nozzles 210 This can prevent the printed product from being scratched by the idle nozzle 210 during printing.

17 and 18, the housing 110 of the carrier 100 may be provided with a positioning hole 111. When the nozzle 210 is lowered, the housing 110 is exposed through the positioning hole 111, and the lower tip of the nozzle 210 is positioned against the inner edge of the positioning hole 111 In this way, it is possible to avoid lateral deviation or shaking of the nozzle 210 when it moves. As shown in FIG. 17, the positioning hole 111 may be opened on the sheet metal part of the housing 110, and it may be a straight through hole or a tapered hole that tapers downward corresponding to the shape of the nozzle 210, and the invention is not limited thereto. As shown in FIG. 18, the positioning hole 111 can also be formed on the plastic part of the housing 110, and thereby a deeper cone-shaped positioning hole 111 can be provided to increase the accuracy of positioning the nozzle 210.

The foregoing descriptions are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Other equivalent changes using the patent spirit of the present invention should all belong to the patent scope of the present invention.

10: Horizontal slide

100: Vehicle

110: Shell

111: positioning hole

120: Carrier

130a/130b: Lifting rail

200: nozzle assembly

201: reset elastic piece

210: nozzle

211: feeding tube

212: heater

220: pressure plate

221: Slope

230a/203b: Guiding structure

300: swing arm

301/301a/301b: rack

310: pivot shaft

320: compression spring

330: Guide wheel

400: drive mechanism

410: Motor

420: power shaft

430/430a/430b: drive gear

440: auxiliary steering elastic

450: positioning elastic

460: reduction gear

500: steering clutch mechanism

510a/510b: coil spring

511a/511b: inner end

512a/512b: external end

FIG. 1 is a three-dimensional schematic diagram of a 3D printing head with electric nozzles capable of lifting and lowering nozzles according to the first embodiment of the present invention.

2 and 3 are three-dimensional schematic diagrams of the internal components of the 3D printing head with the nozzle capable of being lifted and lowered electrically according to the first embodiment of the present invention.

4 and 5 are the three-dimensional exploded schematic diagrams of the internal components of the 3D printing head with the nozzles capable of being lifted and lowered electrically according to the first embodiment of the present invention.

6 is a cross-sectional view of a 3D printing head with electric nozzles capable of lifting and lowering nozzles according to the first embodiment of the present invention.

7 to 9 are schematic diagrams of the operation of the 3D printing head with the nozzles capable of being lifted and lowered electrically according to the first embodiment of the present invention.

10 and 11 are perspective schematic diagrams of a 3D printing head with electric nozzles capable of lifting and lowering nozzles according to a second embodiment of the present invention.

FIGS. 12 and 13 are three-dimensional schematic diagrams of the internal components of a 3D printing head with an electric nozzle capable of lifting and lowering the nozzle of the second embodiment of the present invention.

14 is a perspective exploded view of the internal components of a 3D print head with electric nozzles capable of lifting and lowering according to the second embodiment of the present invention.

15 and 16 are schematic diagrams of the operation of the 3D printing head with the nozzle capable of being lifted and lowered electrically according to the second embodiment of the present invention.

17 and 18 are schematic diagrams of various aspects of the positioning holes in the 3D print head that can be moved up and down by the nozzle of the present invention.

120: Carrier

200: nozzle assembly

210: nozzle

211: feeding tube

212: heater

220: pressure plate

221: Slope

300: swing arm

301: rack

310: pivot shaft

330: Guide wheel

400: drive mechanism

410: Motor

420: power shaft

430: drive gear

440: auxiliary steering elastic

450: positioning elastic

Claims (14)

A 3D printing head with a nozzle that can be electrically lifted and lowered includes: a carrier; a pair of nozzle assemblies are arranged on the carrier, each of the nozzle assemblies includes a nozzle and a reset elastic member, each of the nozzles is movable The carrier is connected to be able to move up and down relative to the carrier, and each of the reset elastic members is respectively connected between the carrier and the corresponding nozzle to be able to lift each nozzle with respect to the carrier; a swing arm, a pivot Connected to the carrier, the swing arm can swing so that one end of the swing arm can move between the pair of nozzles and can selectively push one of the nozzles to lower it; and a driving mechanism that links the swing arm to Driving the swing arm to rotate and swing, wherein the driving mechanism includes a power shaft and a pair of driving gears, the power shaft passes through each of the driving gears, and the power shaft and the pair of driving gears are power connected by a steering clutch mechanism; The steering clutch mechanism includes a pair of coil springs corresponding to each of the drive gears. The pair of coil springs are sleeved outside the power shaft and are respectively fixedly connected to the corresponding drive gears. A pair of corresponding drive gears is provided on the swing arm. Each of the racks respectively extends in an arc with the pivot center of the swing arm as the center, and each of the drive gears respectively meshes with each of the racks, and when the power shaft rotates in any direction, the pair can be driven respectively The helical springs are twisted in opposite directions so that one of the helical springs contracts radially to tighten the power shaft and the other helical spring expands radially to loosen the power shaft, thereby enabling the power shaft to be driven by each of the driving shafts. The gear drives the swing arm to swing bidirectionally within the extension arc range of each rack. According to claim 1, the 3D printing head with the nozzles capable of being lifted and lowered electrically, wherein the pivot point of the swing arm and the carrier is located between the pair of nozzles. According to claim 1 of the 3D printing head with an electric nozzle capable of lifting and lowering the nozzle, an auxiliary steering elastic member is respectively connected between the two sides of the swing arm and the carrier to assist the steering of the swing arm. According to claim 1 of the 3D printing head with an electric nozzle capable of lifting and lowering, a positioning elastic member is connected between the swing arm and the carrier, and the positioning elastic member drives the swing arm to press against and fix the lowered nozzle. According to claim 4, the 3D printing head with electrically liftable nozzles, wherein the positioning elastic member swings with the swing arm and the connection point between the positioning elastic member and the carrier is located between the pair of nozzles. The 3D printing head with electrically liftable nozzles according to claim 1, wherein the carrier includes a housing and a carrier housed in the housing, the pair of nozzle assemblies are housed in the housing and the pair of nozzles The carriers are respectively movably connected. According to claim 6, the 3D printing head with the nozzle capable of being lifted and lowered electrically, wherein the carrier is provided with a positioning hole, the positioning hole is a through hole or a tapered hole corresponding to the shape of the nozzle, and the nozzle is lowered The housing is exposed through the positioning hole, and the lower tip of the nozzle is positioned against the inner edge of the positioning hole. According to claim 1, the 3D printing head with the nozzle capable of being lifted and lowered electrically, wherein each nozzle is provided with a pressure plate, the edge of the pressure plate forms a slope, and the swing arm can move to the corresponding one through any of the slopes. Press the corresponding nozzle on the pressing plate. According to claim 1, the 3D printing head with electric nozzles capable of lifting and lowering the nozzle, wherein the swing arms are plural in number and coaxially rotate in linkage with each other. According to claim 1, the 3D printing head with the nozzle capable of being lifted and lowered electrically, wherein a guide wheel is pivoted on the swing arm for selectively pushing against one of the nozzles. The 3D printing head with the nozzle capable of being raised and lowered electrically according to claim 1, wherein the driving mechanism includes a power shaft and a driving gear sleeved on the power shaft, the swing arm is provided with a rack, and the rack The swing arm extends in an arc with the pivot center of the swing arm as the center, and the drive gear engages the rack so that the power shaft can drive the swing arm to swing within the extension arc range of the rack. According to claim 1 of the 3D printing head with a nozzle that can be electrically lifted, one end of each of the coil springs is fixed to the corresponding driving gear, and each of the coil springs is fixed to the corresponding driving gear with different ends . According to claim 1, the 3D printing head with the nozzle capable of being raised and lowered electrically, wherein the swing arm is pivoted on the carrier by a pivot shaft, the pivot shaft is pivotally connected to the carrier and the pivot shaft is connected through In the swing arm, a compression spring is sleeved on the pivot shaft, and two ends of the compression spring abut the carrier and the swing arm respectively. According to claim 1, the 3D printing head with the nozzle capable of being lifted and lowered electrically, wherein the carrier is provided with a lifting rail, and each nozzle assembly is respectively provided with a guiding structure engaging the lifting rail.

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