WO2016107493A1

WO2016107493A1 - High-speed print head for 3d printer

Info

Publication number: WO2016107493A1
Application number: PCT/CN2015/098731
Authority: WO
Inventors: 陈名乔
Original assignee: 陈名乔
Priority date: 2014-12-29
Filing date: 2015-12-24
Publication date: 2016-07-07
Also published as: CN204451218U

Abstract

Disclosed is a high-speed print head for a 3D printer. The high-speed print head for a 3D printer comprises: a rack; a hydraulic cylinder, mounted on a fixing rack; a feed device, comprising a drive device and a threaded rod, wherein the drive device is fixed on a piston of the hydraulic cylinder, one end of the threaded rod is fixed on an output end of the drive device, a feed hot melting cavity is disposed between a feed port and a discharge port of a feed tube, the threaded rod is inserted in the feed tube, and a tail end of the threaded rod is sleeved with a one-way valve; and a nozzle device and a volume measurement pump. The nozzle device comprises a nozzle tube, a multi-nozzle head, and a rotary power device. The multi-nozzle head is provided with at least two nozzle heads of different calibers. The multi-nozzle head can be rotatably mounted at an exit end of the nozzle tube. The rotary power device is mounted on the volume measurement pump and is connected to the multi-nozzle head. The rotary power device drives the multi-nozzle head to rotate, so that one nozzle head of the multi-nozzle head is communicated with the nozzle tube. The present application has advantages that a high precision printing effect is ensured and a printing speed can be increased.

Description

Manual Title: High Speed Printhead for 3D Printers

[0001] The present application relates to a printing apparatus, and more particularly to a high-speed print head for a 3D printer capable of speeding up printing speed while ensuring high-precision printing results.

[0002]

BACKGROUND

[0004] 3D printing technology is a rapid prototyping technology. Based on digital model files, it uses metal, plastic, inorganic materials, etc. to construct objects by layer-by-layer printing. At present, the 3D printing technology using plastic as a consumable material adopts the fused deposition method (FDM technology), that is, the filamentous hot-melt type material is melted, extruded through a nozzle, deposited on a platform, and finally formed by layering of materials. object. The consumables used in the existing FDM technology are filamentous materials, and it is not possible to directly use ordinary industrial raw materials, so the production cost is high. The existing 3D printer only uses a nozzle for printing. For example, the nozzle has a small aperture. In the main body of the printed product, repeated printing affects the printing speed. For example, if a large-diameter nozzle is used, the printing speed can be improved in the main body of the printing product. , but can't achieve reasonable accuracy when printing edges or details

[0005]

SUMMARY OF THE INVENTION

The present application provides a high speed printhead for a 3D printer that can speed up printing at the same time as a high-precision printing effect.

[0008] In one embodiment, a high speed printhead for a 3D printer is provided, including:

[0009] rack;

[0010] a hydraulic cylinder mounted on a fixed frame;

[0011] a feeding device comprising a driving device and a screw, the driving device is fixed on the piston of the hydraulic cylinder, and one end of the screw is fixed on the output end of the driving device;

[0012] a feed pipe, which is arranged on the frame, has a feed port above the feed pipe, a discharge port below the feed pipe, and a feed between the feed port and the discharge port of the feed pipe Hot melt cavity, screw inserted in the feed pipe, screw end The sleeve is provided with a check valve;

And a nozzle device and a volumetric metering pump, the nozzle device is mounted below the feed pipe, the volumetric metering pump is mounted between the feed pipe and the nozzle device, the nozzle device comprises a nozzle tube, a multi-nozzle head and a rotary power device, the nozzle tube Installed on the volumetric metering pump, through the volumetric metering pump and the discharge port of the feed pipe; the multi-nozzle head is provided with at least two nozzle heads of different calibers, the multi-nozzle head is rotatably mounted at the outlet end of the nozzle tube; The rotary power unit is mounted on the volumetric metering pump and coupled to the multi-nozzle head, and the rotary power unit drives the multi-nozzle head to rotate such that one nozzle head on the multi-nozzle head communicates with the nozzle tube.

[0014] As a preferred manner, further comprising a stroke probe, an upper position sensor and a lower position sensor, wherein the stroke probe is mounted on the feeding device, the upper position sensor and the lower position sensor are mounted on the frame; and the upper position sensor is used When the stroke probe moves to the upper position sensor 吋, a squeezing signal is sent to the driving device; and the lower position sensor is used to send a stop squeezing signal when the stroke probe moves to the lower position sensor 吋

[0015] As a preferred mode, the hydraulic cylinder is a double-acting hydraulic cylinder, and the hydraulic cylinder always applies a constant pressure to the screw during the printing operation.

[0016] As a preferred mode, the nozzle tube is provided with a discharge heating device for heating the fluid in the nozzle tube.

[0017] As a preferred mode, the discharge heating device is an electric heating device.

[0018] As a preferred mode, the multi-nozzle head is rotatably mounted on the outlet end of the nozzle tube through a rotating shaft, and a compression spring is sleeved on the rotating shaft, and the restoring force of the compression spring causes the multi-nozzle head to closely abut the nozzle On the tube.

[0019] As a preferred mode, the rotary power unit is a motor, a cylinder or a cylinder, and is connected to the rotating shaft through a connecting rod, and the rotary power unit drives the rotating shaft to rotate.

[0020] As a preferred mode, the volumetric metering pump includes two gears whose outer circumferences are in close contact with the inner wall of the pump and are closely meshed with each other, and one of the gears is driven to rotate by a servo motor or a stepping motor.

[0021] As a preferred mode, the volumetric metering pump is a heat preservation type metering pump.

[0022] As a preferred mode, the frame is provided with two hydraulic cylinders, and each of the hydraulic cylinders is provided with a feeding device, a feeding tube, a volumetric metering pump and a nozzle device.

[0023] In the working of the present application, the granular or powdery or fluid raw material entering from the feed inlet passes through the mixer Into the feed pipe surrounding the screw, the driving device drives the screw to rotate, and the raw material is extruded into the feed hot melt cavity through the screw, and the raw material is heated in the hot melt cavity and melted into a fluid state, with the increase of the fluid raw material and the temperature. Increased, the fluidity increases, and the fluid flows downward through the one-way valve under the push of the screw, thereby pushing the screw sleeved on the one-way valve upwards together with the driving device integrated with the screw, thereby increasing the feeding. The liquid storage space at the outlet of the pipe does not stop until the predetermined maximum end 吋, the drive device stops working, and the feed process stops. Therefore, the check valve is closed because the lower end pressure is greater than the upper end, preventing fluid backflow, when the fluid passes through the volume. After the metering pump, the nozzle that rotates the multi-nozzle head to one of the required calibers is directed to the workpiece as needed by the rotary power unit, and after the nozzle ejects the fluid, the pressure at the outlet of the feed tube is reduced, and the crucible is maintained by the hydraulic cylinder. a steady downward pressure, the feed device slides down, continuously supplies the feed to the volumetric metering pump, when it drops to the pre- At the bottom of the 吋, the 吋 drive starts to work and continues to feed, so that the raw materials in the volumetric metering pump are replenished and maintained at a constant pressure, thus ensuring the continuity of the supply and using the meter connected to the computer. The pump controls the flow of fluid out of the weir and discharge based on signals from the computer. The application of the hydraulic cylinder ensures the stability of the fluid pressure of the feed pipe, thereby ensuring the continuous stability of the fluid flowing out of the nozzle; and the use of the nozzles of different calibers on the rotatable multi-nozzle head can be directly based on the printing process. It is necessary to adjust the nozzles of different calibers to ensure the printing accuracy of the printed products more quickly. The same application is not limited to the use of filament materials, and it is also possible to use granular or powdery or fluid materials as printing materials. Print more material products.

[0024]

BRIEF DESCRIPTION OF THE DRAWINGS

1 is a front view of an embodiment of the present application;

2 is a side view of an embodiment of the present application;

3 is a schematic structural view of a metering pump according to an embodiment of the present application.

[0029]

DETAILED DESCRIPTION

[0031] The present application will be further described in detail below with reference to the embodiments and with reference to the accompanying drawings.

[0032] A high-speed printhead for a 3D printer, with reference to FIG. 1 to FIG. 3, includes a frame 200, a hydraulic cylinder 100 is fixed on the frame 200, and a fixed rod 100 is fixed on the piston rod 105 of the hydraulic cylinder 100. Along the rack 200 a feeding device that slides up, the outlet of the feeding device communicates with the nozzle structure through a volumetric metering pump 600. The frame 200 is longitudinally disposed with a feeding tube 500, and the feeding device includes a driving device 300 and is driven by The device 300 drives a rotating screw 301 that surrounds the screw and is provided with a mixer 400 above it. The mixer 400 is further provided with a feed port 401, below the feed pipe 500. Set to feed hot melt chamber 501, screw 301

The nozzle sleeve structure includes a nozzle tube 700 connected to the volumetric metering pump 600, and the outlet end of the nozzle tube 700 is rotatably provided with a multi-nozzle head 900. In the embodiment, the multi-nozzle head 900 is circumferentially Two different diameter orifices are arranged in the direction, the multi-nozzle head 900 is rotated to the nozzle of any nozzle to point to the workpiece crucible, and only the nozzle is in communication with the nozzle tube 700, and the multi-nozzle head 900 is provided by a rotary power device 800. Drive rotation. Print fine surface 吋 can be improved with small diameter, print internal structure of workpiece or rough surface 吋 switch larger diameter, greatly improve the average printing speed while maintaining the same precision; when replacing another print head吋, the unused print head can transfer the nozzle to the blank space on the circumference of the spray hole distribution without the nozzle hole, so that the print head hole is at a certain distance above the working print head orifice plane, just print The fragile surface is completely free of any damage.

The print head is operated, and the granular or powdery or fluid material entering from the feed port 401 enters the feed pipe 500 surrounding the screw 301 through the mixer 400, and the driving device 300 drives the screw 301 to rotate, and the raw material passes through the screw 301. The material is squeezed into the feed hot-melting chamber 501, and the raw material is heated in the hot-melting chamber 501 to be melted into a fluid state. As the fluid raw material increases and the temperature rises, the fluid pressure increases and acts on the check valve. The lower fluid flows downwardly in one direction, thereby urging the driving device to slide upward, thereby increasing the liquid storage space at the outlet of the feeding pipe 5 00 until the predetermined maximum end 上升, the driving device stops working, and the 吋 check valve is closed. Preventing fluid backflow. After the fluid is pumped out by the volumetric metering pump 600, the rotary power unit 800 drives the multi-nozzle head 900 to rotate to one of the nozzles of the desired diameter to point to the workpiece, and after the fluid is ejected from the nozzle, The pressure at the outlet of the feed tube 500 is reduced, and since the hydraulic cylinder 100 maintains a steady downward pressure, the feed device slides down for the volumetric metering pump 600. The feed liquid is supplied, and when it descends to the predetermined lowermost crucible, the crucible driving device 300 starts to work and continues to feed, thereby continuously maintaining the raw materials in the volumetric metering pump 600 to be replenished and maintaining a stable pressure, thereby ensuring the feeding. The metering pump 600 connected to the computer is used to control the flow rate of the fluid discharge between the turns and the discharge according to the signal sent from the computer. [0034] In an embodiment of a high-speed printhead for a 3D printer, please refer to FIG. 1 and FIG. 2. On the basis of the foregoing technical solution, a second hydraulic cylinder 100 may be fixed on the frame 200, each of which is fixed. The piston rod 105 of the hydraulic cylinder 100 is respectively fixed with a feeding device which can slide down the frame 200, and the outlet of each of the feeding devices communicates with the nozzle structure through a volumetric metering pump 600, each of which feeds The apparatus includes a driving device 300 and a screw 301 driven to rotate by the driving device 300. The feeding tube 500 surrounds the screw and is provided with a mixer 400 above it. The mixer 400 is further provided with a feeding port 401. The feed tube 500 is disposed below the feed hot melt chamber 501, and the screw 301 is sleeved with a one-way valve; the nozzle structure includes a nozzle tube 700 that communicates with the volumetric metering pump 600, and the nozzle tube 700

A plurality of nozzle heads 900 are provided at the outlet end for rotation. In this embodiment, there are actually two sets of parallel printheads, one of which is used to print the support structure and the other to print the product itself, thereby enabling the printing of overhangs or complex hollow products.

[0035] In an embodiment of a high-speed printhead for a 3D printer, please refer to FIG. 1 and FIG. 2. Based on the foregoing technical solution, the hydraulic cylinder 100 may be a double-acting hydraulic cylinder and connected by the oil pipe 101. The hydraulic cylinder 100 is operated under the nozzle structure to maintain a downward stable pressure, and the rotary screw feed is lifted by the material under the one-way anti-reverse action of the one-way valve, generating pressure and cylinder pressure. The opposite force, the force is greater than the downward pressure of the cylinder. Under the action of the constant pressure relief valve, the excess oil overflows and the cylinder reverses in the opposite direction of pressure, thereby maintaining a constant pressure. Does not hinder the action of the screw feed rising, (the characteristic that the pressure is gradually increased more than the spring is pressed), the hydraulic cylinder 100 generates an upward pressure after the nozzle structure stops working, and cooperates with the volumetric metering pump The 600 reversal causes a negative pressure to be generated in the feed pipe 500, thereby retracting the portion of the material that has flowed out after switching the orifice or passing through a blank area that does not require printing, ensuring that Fast switching between the mixing does not leak orifice or material in the blank area.

[0036] In an embodiment of a high-speed printhead for a 3D printer, please refer to FIG. 1. In addition to the foregoing technical solution, the nozzle tube 700 is further provided with a heater for heating the fluid in the nozzle tube 700. Material heating device 701. Used to maintain the fluidity of the fluid within it.

[0037] In an embodiment of a high-speed printhead for a 3D printer, please refer to FIG. 1 and FIG. 2. Based on the foregoing technical solution, the multi-nozzle head 900 may be rotated by a rotating shaft 802.

Rotating, the rotating shaft 802 is sleeved with a compression spring 803, and the compression spring 803 is back. The counterforce causes the multi-nozzle head 900 to abut against the nozzle tube 700. Ensure its tightness and prevent leakage.

[0038] In an embodiment of a high-speed printhead for a 3D printer, please refer to FIG. 1 and FIG. 2. Based on the foregoing technical solution, the feeding device may be provided with a stroke probe 103. The material device moves up and down, and the stroke probe 103 senses the upper position sensor 102 and the lower position sensor 103 provided on the frame 200, respectively.

[0039] In an embodiment of a high-speed printhead for a 3D printer, please refer to FIG. 1 and FIG. 2. Based on the foregoing technical solution, the driving rotary shaft 802 can be rotated by a motor-driven link 801. . In other embodiments, the rotary power unit 800 can also be a cylinder or cylinder.

[0040] In an embodiment of a high speed printhead for a 3D printer, please refer to FIG. 1 and FIG. 2. Based on the foregoing technical solution, the discharge heating device 501 may be an electric heating device.

[0041] In an embodiment of a high-speed printhead for a 3D printer, please refer to FIG. 1 and FIG. 2. Based on the foregoing technical solution, the volumetric metering pump 600 may include two outer circumferences which are closely attached to the inner wall of the pump. The gears 601, 602, which are closely meshed with each other, one of the gears 601 is driven to rotate by a servo motor. The working principle of the metering pump 600 is that the servo motor adjusts the rotation speed according to the instruction of the computer to control the flow rate of the fluid material. When the servo motor is turned off, the two closely meshing gears do not rotate, and the outer circle is in close contact with the inner wall of the pump, so that the liquid material cannot flow out through the nozzle tube 700. When the two gears 601, 602 are rotated, the fluid material is sent from the outlet of the upper end of the pump body 500 to the outlet of the two gears 601, 602 and the volume of the inner wall of the pump is sent to the nozzle tube 700 to be ejected through the nozzle. .

[0042] In an embodiment of a high-speed printhead for a 3D printer, please refer to FIG. 3. Based on the foregoing technical solution, the volumetric metering pump 600 may be a heat-insulating metering pump.

[0043] The foregoing is a description of the high-speed printhead for the 3D printer of the present application, which is used to help understand the present application, but the embodiments of the present application are not limited by the above embodiments, and any changes made without departing from the principles of the present application, Modifications, substitutions, combinations, simplifications, and equivalent substitutions are all included in the scope of the present application.

technical problem

Problem solution

Advantageous effects of the invention

Claims

Claim

[Claim 1] A high-speed printhead for a 3D printer, comprising:

Rack

a hydraulic cylinder that is mounted on a fixed frame;

a feeding device comprising a driving device and a screw, the driving device being fixed on a piston of the hydraulic cylinder, one end of the screw being fixed on an output end of the driving device; a feeding tube disposed in the a feeding port is arranged above the feeding pipe, a feeding port is arranged below the feeding pipe, and a feeding hot-melting cavity is arranged between the feeding port and the discharging port of the feeding pipe. The screw is inserted into the feeding tube, the screw end is sleeved with a one-way valve; and a nozzle device and a volumetric metering pump, the nozzle device is installed under the feeding tube, and the volumetric metering pump is installed at Between the feed tube and the nozzle device; the nozzle device comprises a nozzle tube, a multi-nozzle head and a rotary power unit, the nozzle tube being mounted on the volumetric metering pump, through the volumetric metering pump and the inlet The discharge port of the material pipe is connected; the multi-nozzle head is provided with at least two nozzle heads of different diameters, and the multi-nozzle head is rotatably mounted at the outlet end of the nozzle tube; the rotary power device is installed at Volumetric measurement On and connected to the multi-nozzle head, said rotational power means for driving said multi-nozzle head is rotated, so that the multi-nozzle head with a nozzle head of the nozzle pipe Unicom.

[Claim 2] The high speed printhead for a 3D printer according to claim 1, further comprising a stroke probe, an upper position sensor, and a lower position sensor, wherein the stroke probe is mounted on the feeding device The upper position sensor and the lower position sensor are mounted on the frame; the upper position sensor is configured to send a squeeze signal to the driving device when the stroke probe moves to the upper position sensor The lower position sensor is configured to send a stop extruding signal to the driving device when the stroke probe moves to the lower position sensor.

[Claim 3] The high-speed printhead for a 3D printer according to claim 1, wherein the hydraulic cylinder is a double-acting hydraulic cylinder, and the hydraulic cylinder always applies a constant constant to the screw during a printing operation pressure.

[Claim 4] The high speed print head for a 3D printer according to claim 1, wherein the nozzle A discharge heating device for heating the fluid in the nozzle tube is provided on the tube.

[Claim 5] The high speed printhead for a 3D printer according to claim 4, wherein the discharge heating device is an electric heating device.

[Claim 6] The high-speed printhead for a 3D printer according to claim 1, wherein the multi-nozzle head is rotatably mounted at an exit end of the nozzle tube through a rotating shaft, and the rotating shaft is sleeved A compression spring is provided, the restoring force of the compression spring causing the multi-nozzle head to abut against the nozzle tube.

The high-speed printhead for a 3D printer according to claim 6, wherein the rotary power unit is a motor, a cylinder or a cylinder, and is connected to the rotating shaft via a connecting rod, the rotating power The device drives the rotating shaft to rotate.

[Claim 8] The high-speed printhead for a 3D printer according to claim 1, wherein the volumetric metering pump comprises two gears whose outer circumferences are in close contact with the inner wall of the pump and closely mesh with each other, wherein one of the gears is servo The motor or stepper motor drives the rotation.

A high-speed printhead for a 3D printer according to claim 1, wherein the volumetric metering pump is a heat retention type metering pump.

The high-speed printhead for a 3D printer according to any one of claims 1 to 9, wherein the frame is provided with two hydraulic cylinders, each of which is provided below the hydraulic cylinder. There are feeding devices, feed pipes, volumetric metering pumps and nozzle devices.