3D printing system with rotary material table

Abstract

The invention relates to a 3D printing system with a rotary material table, comprising: a printing head, the printing head comprises a printing seat and a nozzle seat rotatably arranged on the printing seat, and the bottom of the nozzle seat is provided with at least one extrusion port for extruding a printing material; the material table comprises a material table frame, a center shaft, a bearing and at least one feeding component used for conveying printing materials to at least one extrusion port, the material table frame can rotate relative to the center shaft, the bearing comprises an outer ring and an inner ring which can rotate relative to each other, the material table frame is fixedly connected with the outer ring, and the center shaft is fixedly connected with the inner ring. The feeding pipe and / or the wire can be prevented from being excessively wound due to rotation of the nozzle holder on the printing head, feeding is smoother, and the rotation angle of the nozzle holder can be free and unlimited.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and particularly to a 3D printing system with a rotating material platform. Background Art

[0002] 3D printing is based on a digital model file and constructs an object by layer-by-layer printing. In the fused extrusion molding process, namely the FFF (Fused Filament Fabrication) or FDM (Fused Deposition Modeling) method, a heat-meltable and flowable resin printing material is extruded through a nozzle moving along a printing path onto a platform. After one layer of printing is completed, the print head and the printing platform move away from each other by a certain distance, and then continue to print a new layer. Layers are stacked until a three-dimensional model is formed. In the traditional fused extrusion 3D printing method, it is generally difficult to achieve simultaneous printing and extrusion molding with multiple nozzles. A 3D printer with multiple nozzles, such as two nozzles, generally performs nozzle extrusion printing materials alternately. Although multiple nozzles can be simultaneously printed by rotating the print head with multiple nozzles, the rotation angle of multiple nozzles is often restricted by the kinking effect of the wire feeding tube or wire harness. The control process of multiple nozzles is additionally restricted by the physical structure of the printer, affecting the flexibility, printing speed, printing accuracy, etc. of the printing process, and also increasing the development difficulty of the control system. Summary of the Invention

[0003] Aiming at the deficiencies existing in the above-mentioned prior art, the present invention provides a 3D printing system with a rotating material platform, which solves the technical problem that the feeding tube or wire harness of the 3D printing device is excessively wound due to the rotation of the nozzle seat on the print head in the prior art.

[0004] The present invention discloses a 3D printing system with a rotating material platform, comprising:

[0005] A print head, which includes a print base and a nozzle seat rotatably arranged on the print base, and at least one extrusion port for extruding printing material is provided at the bottom of the nozzle seat;

[0006] A material platform, which includes a material platform frame, a central shaft, a bearing, and at least one feeding component for conveying printing material to at least one of the extrusion ports. The material platform frame is rotatable relative to the central shaft. The bearing includes an outer ring and an inner ring that can rotate relative to each other. The material platform frame is fixedly connected to the outer ring, the central shaft is fixedly connected to the inner ring, and at least one of the feeding components is installed on the material platform frame and can rotate together with the material platform frame;

[0007] Among them, a flexible circuit is connected between the material platform frame and the nozzle seat. The flexible circuit includes a printing material transmission circuit formed between the feeding component and the extrusion outlet for transmitting printing material. The material platform frame rotates following the nozzle seat to prevent or reduce winding of the flexible circuit.

[0008] Preferably, the material platform is arranged above the print head.

[0009] A further improvement of the 3D printing system with a rotating material platform according to the present invention lies in that a fixing ring is fixed to the upper outer periphery of the outer ring, the lower outer periphery of the outer ring is fixed to the material platform frame, the fixing ring and the material platform frame are fixedly connected to each other. The inner side of the fixing ring has a first stepped hole for the outer ring to be sleeved and limited to the upper part of the outer ring, and the inner side of the material platform frame has a second stepped hole for the outer ring to be sleeved and limited to the lower part of the outer ring;

[0010] Alternatively, the number of the bearings is two, and the two bearings are arranged in contact. The upper surface and the outer surface of the outer ring of the upper bearing are in contact with the fixing ring, and the lower surface and the outer surface of the outer ring of the lower bearing are in contact with the material platform frame. And the fixing ring, the outer ring of the upper bearing, the outer ring of the lower bearing and the material platform frame are locked together by screwing the fixing ring through the material platform frame;

[0011] Alternatively, the number of the bearings is two, and the two bearings are arranged at intervals. The upper end of the fixing ring is in contact with the outer surface and the lower surface of the outer ring of the upper bearing, the lower end of the fixing ring is in contact with the outer surface and the upper surface of the outer ring of the lower bearing, and the lower surface and the outer surface of the outer ring of the lower bearing are in contact with the material platform frame. And the fixing ring, the outer ring of the lower bearing and the material platform frame are locked together by screwing the fixing ring through the material platform frame;

[0012] And / or, a boss is formed by the upper part of the central shaft extending outwards and is clamped to the top surface of the inner ring, and the bottom surface of the inner ring is fixed to the central shaft through a fastener.

[0013] For example, a screw passes through the material platform frame to connect the fixing ring and can fix the outer ring of the bearing. Specifically, the fixing ring is above the bearing, the material platform frame is below the bearing, and the fixing ring and the material platform frame are fixedly connected by a screw. At the same time, the outer ring of the bearing is clamped between the fixing ring and the material platform frame.

[0014] A further improvement of the 3D printing system with a rotating material platform according to the present invention lies in that the material platform further includes a first driving mechanism for driving the material platform frame to rotate:

[0015] The first driving mechanism includes a first motor, a synchronous pulley fixed on the output shaft of the first motor, a synchronous belt tooth fixed on the fixed ring, and a first synchronous belt that is engaged and connected between the synchronous pulley and the synchronous belt tooth; a substrate is fixed on the upper part of the central shaft, and both the first motor and the first synchronous belt are arranged on the side of the substrate facing the material table frame, and the first motor is fixedly connected to the substrate; the central shaft is also fixed on the substrate, thereby forming a material table assembly module; preferably, the motor, the synchronous belt, the bearing, the central shaft, and the material table frame are all arranged on the same side of the substrate; further, the material table assembly module can be further installed on a frame, such as the frame of a 3D printing device;

[0016] Alternatively, the first driving mechanism includes a second motor and a gear pair connected between the second motor and the fixed ring;

[0017] Alternatively, the first driving mechanism includes a third motor with a hollow shaft, and the third motor is sleeved and fixed on the outer periphery of the material table frame or the outer periphery of the fixed ring;

[0018] Alternatively, the first driving mechanism includes a first linear angle coupling mechanism for driving the material table frame to rotate and move, and the material table frame or the fixed ring is coaxially and fixedly connected to the linkage wheel of the first linear angle coupling mechanism.

[0019] Preferably, the driving mechanism is arranged above the bearing. For example, the synchronous belt and the synchronous pulley for driving the material table frame to rotate are arranged above the bearing (on the side relatively far from the print head with respect to the bearing), so that there is more space below the synchronous belt to arrange the material tray or other material source devices. Preferably, the synchronous belt and the synchronous pulley are arranged below the substrate, so that the upper part of the substrate can be used as an installation surface, which is more convenient for the entire module to be installed on the frame of the 3D printing device. Reducing the occupation of the space above the substrate is beneficial to reducing the volume of the 3D printing device.

[0020] Further, a boss is arranged on one side of the inner ring of the bearing on the central shaft, and a fastener (such as a lock nut or a snap ring, etc.) is arranged on the other side opposite to the inner ring of the bearing and connected to the central shaft to fixedly connect the inner ring of the bearing. Specifically, a stepped shaft is arranged on the outer side of the upper end of the central shaft, which passes through the upper part of the inner ring of the bearing and is limited by the step with the upper edge of the inner ring of the bearing. A thread is arranged at the lower end of the central shaft, and the inner ring of the bearing is locked between the lock nut and the stepped shaft of the central shaft by the lock nut.

[0021] A further improvement of the 3D printing system with a rotating material table according to the present invention is that a through hole along the axial direction for the flexible circuit to pass through is arranged on the nozzle seat. Specifically, the through hole can be used for a feeding pipe, a wire, an air pipe, an ink feeding pipe, etc. to pass through.

[0022] The further improvement of the 3D printing system with a rotating material platform according to the present invention lies in that a central through hole is provided along the axial direction of the central shaft. The central shaft may have a through hole along the axial direction, and the through hole can be used for a circuit to pass through or for installing a conductive slip ring to allow the circuit to pass through, and / or for installing an air supply pipe to pass through. Since the central shaft does not rotate with the material platform frame, by arranging a through hole along the axial direction on the central shaft, it is easier to arrange wires, air pipes, material pipes, etc. to pass through the through hole.

[0023] The further improvement of the 3D printing system with a rotating material platform according to the present invention lies in that a first conductive slip ring is provided in the central through hole. The first conductive slip ring includes a first slip ring and a second slip ring that can rotate relative to each other, and the first slip ring and the second slip ring can maintain electrical connection during the relative rotation process. The first slip ring is fixed to the material platform frame, and the second slip ring is fixed to the central shaft; or a second conductive slip ring is provided on the print head. The second conductive slip ring includes a third slip ring and a fourth slip ring that can rotate relative to each other, and the third slip ring and the fourth slip ring can maintain electrical connection during the relative rotation process. The third slip ring is fixed to the nozzle seat, and the fourth slip ring is fixed to the print seat.

[0024] The wire connected to the first slip ring on the first conductive slip ring can be used to connect to electrical or detection devices on the material platform or the print head, such as a feeder, a heating block, a temperature sensor, or a position sensor, etc. The wire connected to the second slip ring can be connected to the controller. A computer program can run in the controller to control the electrical devices on the material platform or the print head or collect the sensor signals on the material platform or the print head. A through hole can be provided axially in the first conductive slip ring for air supply, and the second slip ring of the first conductive slip ring can be fixedly connected to the locking nut.

[0025] The further improvement of the 3D printing system with a rotating material platform according to the present invention lies in that the substrate is fixed to the upper part of the central shaft or the central shaft is integrally formed with the upper substrate. A groove for accommodating wires and / or pipelines is provided on the side of the substrate away from the material platform frame, and the groove communicates with the central through hole.

[0026] The further improvement of the 3D printing system with a rotating material platform according to the present invention lies in that the material platform is installed on the frame of the 3D printing device through the substrate. The surface of the substrate away from the material platform frame abuts against the frame of the 3D printing device, or a separator is provided between the surface of the substrate away from the material platform frame and the frame of the 3D printing device. The separator can prevent the substrate from pressing on wires or pipelines during the process of abutting against the frame. The separator can also be made of an insulating material, such as a plastic material, which can be used for insulation protection and also for sealing between the substrate and the frame.

[0027] The further improvement of the 3D printing system with a rotating material platform according to the present invention lies in that the feeding component is a material tray, a feeder, or a feeding device;

[0028] The flexible line is a filament printing material, a feeding tube, a wire, an air supply tube or an ink supply tube; wherein, the air supply tube is used to convey the air source on the material table frame to the nozzle seat, and the air source is a blower arranged on the material table frame or an air supply passage with a central through hole axially arranged through the central axis; the feeding tube is used to convey the printing material from the feeding component on the material table frame to the nozzle seat; the wire is used to connect the circuit from the material table frame to the electrical device on the nozzle seat; the ink supply tube is used to connect the ink cartridge to the inkjet head installed on the nozzle seat;

[0029] Alternatively, the bearing is a deep groove ball bearing, an angular contact ball bearing, a double row angular contact ball bearing, two angular contact ball bearings arranged face to face or back to back, or two bearings arranged at an axial interval.

[0030] A further improvement of the 3D printing system with a rotating material table according to the present invention lies in that the bottom of the nozzle seat includes at least two extrusion outlets, and at least two of the extrusion outlets are respectively used for extruding the printing material; wherein,

[0031] At least two feeding drives are arranged on the material table frame, and the two feeding drives are arranged on the material table frame and can rotate with the material table frame. The two feeding drives are used to respectively convey the filament printing material to at least two of the extrusion outlets; the directions of the filament printing materials respectively conveyed by the two feeding drives are inclined downward and close to each other, or the discharge ports of the two feeding drives are inclined downward in the direction close to the rotation axis of the material table frame;

[0032] Or,

[0033] A first material tray, a first feeder, a second material tray and a second feeder are arranged on the material table frame. The first material tray, the first feeder, the second material tray and the second feeder are arranged in sequence around the rotation axis of the material table frame. The drive motor of the first feeder is arranged in a direction away from the rotation axis of the material table frame relative to the first feeder, and the drive motor of the second feeder is arranged in a direction away from the rotation axis of the material table frame relative to the second feeder.

[0034] Compared with the prior art, the effects of the present invention are positive and obvious. The specific effects are as follows:

[0035] 1. Avoid the overwinding of the feeding tube and / or wire due to the rotation of the nozzle seat on the print head, making the feeding smoother, and the rotation angle of the nozzle seat can be freely unrestricted.

[0036] 2. The material table frame is fixedly connected to the outer ring of the bearing, which is more convenient for the arrangement of the drive device for driving the rotation of the material table frame and the connection with the material table frame. The material tray or the material source device is more convenient to be connected to the material table frame, and is beneficial to improving the stability of the connection structure.

[0037] 3. The central axis is fixedly connected to the inner ring of the bearing (fixed connection). The central axis can be used as the connection interface of the material platform assembly module to connect with, for example, a substrate or the frame of a 3D printing device, etc. This is conducive to the disassembly, assembly and modular development of the material platform device module.

[0038] 4. Along the axial direction of the bearing, such a setting can greatly reduce the size, which is conducive to reducing the height of the 3D printing device and making the structure more compact. Description of the Drawings

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0040] Figure 1 It is a schematic diagram of a 3D printing system with a rotating material platform of the present invention.

[0041] Figure 2 It is a schematic diagram of an embodiment of a 3D printing system in which a synchronous pulley is arranged on the material platform frame and a blower is arranged on the material platform.

[0042] Figure 3 It is a schematic diagram of an embodiment of a 3D printing system in which a gear is arranged on the material platform frame and a feeding device and a blower are arranged on the material platform frame.

[0043] Figure 4 It is a schematic diagram of an embodiment of a 3D printing system in which a fixing ring is arranged above the bearing and fixedly connected to the material platform frame.

[0044] Figure 5 It is a schematic diagram of an embodiment of a 3D printing system in which the central axis of the material platform is fixedly connected to the substrate or the two-way feeding drives are arranged at an angle to each other.

[0045] Figure 6 It is a schematic diagram of an embodiment in which the material platform module is installed on the frame of the 3D printing system.

[0046] Figure 7 It is a schematic diagram of an embodiment of a 3D printing system in which the material platform frame is driven to rotate by a line angle coupling mechanism or the two-way feeding drives are arranged at an angle to each other.

[0047] Figure 8 It is a schematic diagram of an embodiment of the circumferential arrangement mode of the feeder and the material tray on the material platform around the rotation axis of the material platform frame. Detailed Embodiments

[0048] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0049] This application provides a 3D printing system, which includes a material table and a print head. The print head includes a print base and a nozzle seat 71. The nozzle seat 71 is rotatably arranged on the print base. The bottom of the nozzle seat 71 includes at least one extrusion port for extruding printing material. The material table includes a material table frame 20, a central shaft 10, a bearing 62, and at least one feeding component. The material table frame 20 can rotate relative to the central shaft 10. The feeding component is arranged on the material table frame 20 and can rotate together with the material table frame 20 for feeding printing material to at least one extrusion port. The bearing 62 includes an outer ring and an inner ring that can rotate relative to each other. The material table frame 20 is fixedly connected (fixed connection) to the outer ring of the bearing 62, and the central shaft 10 is fixedly connected to the inner ring of the bearing 62.

[0050] A flexible circuit is connected between the material table frame 20 of the material table and the nozzle seat 71 of the print head. The flexible circuit includes a printing material transmission circuit formed between the feeding component and the extrusion port for transmitting printing material. The material table frame 20 of the material table can rotate following the nozzle seat 71 of the print head to prevent excessive winding of the flexible circuit. The flexible circuit can include filamentous printing material, a feeding pipe 37, a wire 52, or an air supply pipe 44, or an ink supply pipe, etc.

[0051] A fixing ring 23 (synchronous pulley) is arranged on one side relative to the outer ring of the bearing 62, and the material table frame 20 is arranged on the other side relative to the outer ring of the bearing 62. The fixing ring 23 and the material table frame are fixedly connected to each other. For example, the fixing ring 23 is connected to the material table frame 20 through a screw, and the outer ring of the bearing 62 can be fixedly connected. Specifically, the fixing ring 23 is above the bearing 62, and the material table frame 20 is below the bearing 62. The fixing ring 23 and the material table frame 20 are fixedly connected together by screws. At the same time, the outer ring of the bearing 62 is clamped between the fixing ring 23 and the material table frame 20. The inner side of the fixing ring 23 has a stepped hole, and the upper part of the outer ring of the bearing 62 is sleeved through the stepped hole, and is limited by the step on the upper side (upper surface) of the outer ring of the bearing 62. The inner side of the material table frame 20 has another stepped hole, and the lower part of the outer ring of the bearing 62 is sleeved through this stepped hole, and is limited by the step on this stepped hole with the lower side (lower surface) of the outer ring of the bearing 62.

[0052] The bearing 62 can adopt a deep groove ball bearing 62, an angular contact ball bearing 62, a double row angular contact ball bearing 62, or multiple bearings 62 are arranged coaxially. For example, two bearings 62 are arranged side by side in contact, such as two angular contact ball bearings 62 are arranged face to face or back to back in contact, or two bearings 62 are arranged with a spacing.

[0053] Further, it includes a driving mechanism for driving the material table to rotate. For example, a motor drives the synchronous belt teeth on the fixed ring 23 through a synchronous belt, thereby driving the material table frame 20 to rotate. Alternatively, a synchronous pulley or gear may be provided on the fixed ring 23, and the motor can drive the fixed ring 23 to rotate through the synchronous belt or gear. Or a motor with a hollow shaft is sleeved on the fixed ring 23 outside the material table frame 20 or above the outer side of the bearing 62 to drive the material table frame 20 to rotate. Or a linear angle coupling mechanism drives the material table frame 20 to rotate and move.

[0054] Preferably, the driving mechanism is arranged above the bearing 62. For example, the synchronous belt and synchronous pulley for driving the material table frame 20 to rotate are arranged above the bearing 62 (on the side relatively far from the print head with respect to the bearing 62). In this way, there is a larger space below the synchronous belt for arranging a material tray or other material source devices. Preferably, the synchronous belt and synchronous pulley are arranged below the substrate 11, so that the upper surface of the substrate 11 can be used as a mounting surface, which is more convenient for the entire module to be mounted on the frame of the 3D printing device. Reducing the occupation of the space above the substrate 11 is beneficial to reducing the volume of the 3D printing device.

[0055] Further, a boss is provided on one side of the inner ring of the bearing 62 on the central shaft 10, and a fastener (such as a lock nut or a snap ring, etc.) is provided on the other side opposite to the inner ring of the bearing 62 to be connected to the central shaft 10 and fixedly connect the inner ring of the bearing 62. Specifically, a stepped shaft is provided on the outer side of the upper end of the central shaft 10, which passes through the upper part of the inner ring of the bearing 62 and is limited by the step to the upper edge (upper surface) of the inner ring of the bearing 62. A thread is provided at the lower end of the central shaft 10, and the inner ring of the bearing 62 is locked between the lock nut and the stepped shaft of the central shaft 10 through the lock nut.

[0056] Further, the central shaft 10 may have a through hole 109 along the axial direction. The through hole 109 can be used for a circuit to pass through or for installing a conductive slip ring to allow the circuit to pass through, and / or for installing an air supply pipe to pass through. Since the central shaft 10 does not rotate with the material table frame 20, by providing the through hole 109 along the axial direction on the central shaft 10, it is easier to arrange wires, air pipes, material pipes, etc. to pass through the through hole 109.

[0057] A conductive slip ring can also be arranged in the through hole. The conductive slip ring includes a first slip ring 511 and a second slip ring 512 that can rotate relative to each other, and a plurality of conductive lines can be kept conducting during the relative rotation between the first slip ring 511 and the second slip ring 512. For example, the first slip ring 511 of the conductive slip ring is fixedly connected to the material table frame 20, and the second slip ring 512 is fixedly connected to the central shaft 10. The wire connected to the first slip ring 511 on the conductive slip ring can be 52 used to connect to electrical appliances or detection devices on the material table or the print head, such as a feeder, a heating block 75, a temperature sensor or a position sensor, etc., and the wire connected to the second slip ring 512 can be connected to the controller. A computer program can be run in the controller to control the electrical appliances on the material table or the print head or collect the sensor signals on the material table or the print head.

[0058] A through hole is arranged axially in the conductive slip ring for air supply. The second slip ring 512 of the conductive slip ring can be fixedly connected to the locking nut.

[0059] It can also include a substrate 11, and the central shaft 10 and the motor are both fixed to the substrate 11, and a material table assembly module can be formed; optimally, the motor, the synchronous belt, the bearing 62, the central shaft 10 and the material table frame 20 are all arranged on the same side of the substrate 11.

[0060] Furthermore, the material table assembly module can be further installed on a frame, such as the frame of a 3D printing device.

[0061] A groove can also be arranged on the side of the substrate 11 away from the material table frame 20, and the groove can be used to accommodate wires and / or pipelines.

[0062] When the material table assembly module is further installed on the frame 19, the surface of the substrate 11 away from the material table frame 20 abuts against the frame 19 of the 3D printing device, or an isolation plate 18 is arranged between the surface of the substrate 11 away from the material table frame 20 and the frame 19 of the 3D printing device; the isolation plate 18 can be used to cover the groove to prevent the wires 53 or pipelines from being pressed during the process of the substrate 11 abutting against the frame, and the isolation plate 18 can also be made of an insulating material, such as a plastic material, which can be used for insulation protection and can also be used for sealing between the substrate 11 and the frame 19.

[0063] Optimally, the material table is arranged above the print head.

[0064] The nozzle seat 71 on the print head can also be provided with a through hole for a feed pipe 37, a wire 52, an air pipe or an ink supply pipe, etc. to pass through.

[0065] The conductive slip ring can also be arranged on the print head. For example, the first slip ring 511 of the conductive slip ring is fixedly connected to the nozzle seat 71, and the second slip ring 512 is fixedly connected to the print seat.

[0066] An embodiment, the bottom of the nozzle seat 71 includes at least two extrusion outlets for extruding printing material; at least two feeding drives are arranged on the material table frame 20. The two feeding drives are arranged on the material table frame 20 and can rotate together with the material table frame 20. The two feeding drives are used to convey the printing material to the two extrusion outlets respectively; the directions of the discharge ports of the two feeding drives for sending out the wire materials are inclined downward and close to each other (that is, the discharge port of at least one path is inclined to discharge towards the discharge port of the other path, or the discharge ports of the two paths discharge simultaneously in the direction of approaching each other), or the discharge ports of the two feeding drives are inclined towards the direction of the rotation axis of the material table frame 20 and convey downward. Downward means the direction towards the print head along the rotation axis of the material table frame. Such a setting makes the filamentous printing materials (wire materials) sent out by the two feeding drives approach each other in a short distance, which is beneficial for multiple wire materials to be combined together and sent to the print head, and has greater angular adaptability to the rotation of the print head. That is, when the print head has the same rotation angle, the torsional moment between the multi-wire materials is smaller, the torsional deformation of the wire materials is smaller, and the transmission of the wire materials to the print head is smoother, which can greatly reduce the angular range of the material table following the rotation of the print head. It is beneficial to reduce the rotation time or angular velocity of the material table, or reduce the fluctuation of the rotation of the material table. It is also beneficial to reduce the process or transmission length of the feeding pipes 37 bending towards each other, beneficial to reduce the distance between the material table and the print head, and beneficial to reduce the volume of the printing device.

[0067] The feeding drive is used to drive the filamentous printing material to feed and convey along the axis. The two feeding drives can be two feeders, or one feeder can drive two paths of printing materials at the same time. For example, the two feeding drives can include a first feeder and a second feeder. A first material tray and a second material tray can also be arranged on the material table frame 20. The first feeder conveys the printing material on the first material table to the first extrusion outlet, and the second feeder conveys the printing material on the second material table to the second extrusion outlet.

[0068] The first material tray, the first feeder, the second material tray, and the second feeder are arranged in sequence around the rotation axis of the material table frame 20. Preferably, the drive motor of the first feeder is arranged in the direction away from the rotation axis of the material table frame 20 relative to the first feeder, and the drive motor of the second feeder is arranged in the direction away from the rotation axis of the material table frame 20 relative to the second feeder.

[0069] The following will be described in conjunction with the drawings in the embodiments of the present invention.

[0070] Figures 1 to 6 Schematically shows a 3D printing system with a material table, including a material table and a print head. The print head includes a print seat 72 and a nozzle seat 71. The nozzle seat 71 can rotate relative to the print seat 72. For example Figure 2It is shown in the figure that a secondary bearing 621 can be provided between the nozzle base 71 and the printing base 72, so that the nozzle base 71 can rotate more smoothly relative to the printing base 72. At least one extrusion port 73 is provided below the nozzle base 71, and the extrusion port 73 is used for extruding printing material; the material table includes a material table frame 20, a central shaft 10, a bearing 62 and at least one feeding component. The material table frame 20 can rotate relative to the central shaft 10 or around its own axis 91; the feeding component is arranged on the material table frame 20 and can rotate together with the material table frame 20, and the feeding component is used for conveying printing material to at least one extrusion port 73; the bearing 62 includes an outer ring and an inner ring that can rotate relative to each other. The material table frame 20 is fixedly connected to the outer ring of the bearing 62, and the central shaft 10 is fixedly connected to the inner ring of the bearing 62; a flexible circuit is connected between the material table frame 20 of the material table and the nozzle base 71 of the print head. The flexible circuit includes a printing material transmission circuit formed between the feeding component and the extrusion port 73 for transmitting printing material; the material table frame 20 of the material table can rotate following the nozzle base 71 of the print head.

[0071] Figure 1 In the figure, the material table includes a central shaft 10, a material table frame 20 and a bearing 62. The bearing includes an inner ring and an outer ring that can rotate relative to each other. The central shaft 10 is fixedly connected to the inner ring, and the material table frame 20 is fixedly connected to the outer ring. It also includes a material source component for sending the printing material to the print head. For example, the material source component is a material disk 31 connected to the material table frame 20, for example, connected to the material table frame 20 through a bracket 22. The material table frame 20 may also include a bushing portion 21 for sleeving on the outer ring of the bearing 62. The material disk 31 can wind the filamentous plastic printing material. When the printing material is sent out, the printing material can drive the material disk 31 to rotate around its own axis. For example, the printing material is fed and conveyed through a feeder 35. The feeder 35 is a device that can convey the filamentous printing material along the axis direction of the printing material. The feeder can also be fixed to the material table frame 20. For example, the printing material can be conveyed to the print head through a feed pipe 37 connected to the print head. Of course, the feeder can also be fixed to the print head. The material disk 31 is connected to the material table frame 20 and can rotate together with the material table frame 20 in the direction shown by the arrow Φ in the figure. The print head includes a printing base 72, a nozzle base 71 rotatably arranged on the printing base 72, and also includes an extrusion port 73 connected to the nozzle base 71. When the nozzle base 71 drives the extrusion port 73 to rotate around its own axis relative to the printing base, the material table frame 20 can drive the material disk 31 to rotate around its own axis 91 following it, so as to avoid excessive torsion or winding of the printing material. The axis 91 of the material table frame and the rotation axis of the nozzle base 71 can be arranged at an angle to each other. Preferably, the two are arranged in parallel.

[0072] A central through-hole 109 along the axis 91 may also be provided on the material platform 20. The central through-hole 109 can be used for wires 52 or air supply pipes 44, etc. to pass through. For example, the wire 52 is connected from the material platform to the print head, such as being connected to the heating block 75 on the print head for heating or temperature detection, etc. Of course, the central through-hole 109 may not be provided on the material platform 20, as Figure 3 shown. A through-hole 711 along its own axis direction may also be provided on the nozzle seat 71 of the print head. The through-hole 711 can be used for a feeding pipe 37, an air supply pipe 44 or an ink supply pipe, etc. to pass through and be connected to the lower part of the nozzle seat 71. For example, the feeding pipe 37 communicates with the extrusion port 73. Of course, the through-hole 711 may not be provided on the nozzle seat 71. There is still a heating block 75 on the printing material conveying pipeline above the extrusion port 73, and heat dissipation fins 76 may also be provided above the heating block 75. The extrusion port 73 can be circular, polygonal, elliptical, etc., or be inclined, as Figure 2 shown.

[0073] Other devices may also be provided on the material platform. For example, Figure 2 as shown, the blower 43 can be connected to the material platform 43. The air sent out by the blower 43 is transmitted to the print head through the air supply pipe 44. For example, it can pass through the through-hole 711 on the nozzle seat 71. This air can be used to blow and cool the printing material just extruded from the extrusion port 73, and can also be used to Figure 1 blow and dissipate heat from the heat dissipation fins 76 in Figure 3 It is also shown that multiple trays can be provided, such as the main tray 31 and the auxiliary tray 32, the feeder 35 corresponding to the main tray 31 and the auxiliary feeder 36 corresponding to the auxiliary tray 32, which respectively send the printing material to the extrusion port 73 and the auxiliary extrusion port 74 on the print head. Both extrusion ports are fixedly connected to the nozzle seat 71. Figure 3 It is also shown that a feeding device 46 and an ink cartridge 42 can be provided on the material platform. The feeding device 46 and the ink cartridge 42 can be fixedly connected to the material platform 20. The feeding device 46 connected to the material platform 20 can provide the printing material of granular resin material. For example, it can be a funnel filled with granular printing material, and the printing material is sent to the extruder 45 fixedly connected to the nozzle seat 71 on the print head through the feeding pipe 37. The extruder 45 can be a screw extruder. By melting and heating the granular printing material and rotating the screw, the printing material is extruded from the lower outlet. A screw pump can also be provided on the feeding device to accelerate the feeding of the granular material. Figure 6 It is shown in Figure 3 that the feeding device 46 can also directly pressurize and / or heat the printing material, and push the printing material through the feeding pipe 37 to be extruded from the extrusion port 73 on the print head. Continuous fiber filament printing material can be wound on the auxiliary tray 32 connected to the material platform 20. Figure 2It is shown schematically that a nozzle holder 712 can also be provided on the print head and connected to the nozzle seat 71 to rotate together with the nozzle seat 71. Each device, such as the extrusion port 73, the secondary extrusion port 74, the inkjet head 41, and / or the extruder 45, etc., can be fixedly connected to the nozzle holder 712. The shape of the nozzle holder 712 in the figure is only for illustration and is not limited to a plate-like structure.

[0074] Figure 3 It is shown schematically that a second conductive slip ring can be provided on the print head. For example, the third slip ring 513 of the second conductive slip ring is connected to the nozzle seat 71, and the fourth slip ring 514 is connected to the print seat 72.

[0075] Figure 3 It is shown schematically that the workbench can also include a substrate 11. The central axis 10 passes upward through the corresponding holes in the bearing 62 and the substrate 11. The substrate can be fixedly connected to the central axis 10 through a lock nut 63. The motor 61 that drives the workbench frame 20 to rotate through a gear pair can be fixedly connected to the substrate 11. The inner hole of the workbench frame 20 axially fixes the bearing 62 through a shaft retaining ring 65.

[0076] One or more combinations of the following devices are provided on the workbench frame 20: one or more material trays 31, on which filamentous printing materials are wound, and the feeding component includes the material tray 31; and / or, a feeding device 46, an extruder 45 is fixedly connected to the nozzle seat 71, a feeding pipe 37 is provided between the feeding device 46 and the extruder 45, the feeding device 46 is used to convey granular printing materials to the print head, the feeding component includes the feeding device 46, and the flexible circuit includes the feeding pipe 37; and / or, an ink cartridge 42: an inkjet head 41 is provided on the nozzle seat 71, a ink supply pipe is provided between the ink cartridge 42 and the inkjet head 41, the ink cartridge 42 is used to convey ink to the inkjet head 41 through the ink supply pipe, and the flexible circuit includes the ink supply pipe; and / or, a blower 43, the air sent out by the blower 43 is transmitted to the print head through the air supply pipe 44 passing through the through hole 711, and the flexible circuit includes the air supply pipe 44; and / or, a feeder 35, the feeder 35 is used to feed the filamentous printing materials on the material tray 31 installed on the workbench frame 20 to the extrusion port 73 on the print head through the feeding pipe 37, and the flexible circuit includes the feeding pipe 37.

[0077] As Figure 4 As shown, for the first conductive slip ring 51, a central through hole 109 is provided in the central axis 10, and the first conductive slip ring 51 is provided in the central through hole 109. The first conductive slip ring 51 includes a first slip ring 511 and a second slip ring 512 that can rotate relative to each other, and a conductive connection of the corresponding circuit can be maintained between the two. The first slip ring 511 of the first conductive slip ring 51 is connected to the workbench frame 20, the second slip ring 512 is connected to the central axis 10, and there is a wire 52 connection between the first slip ring 511 and the nozzle seat 71.

[0078] Figures 4 to 7As shown, it may further include a fixing ring 23. The fixing ring 23 is arranged above the outer ring of the bearing 62, and the material table frame 20 is arranged below (the lower surface) the outer ring of the bearing 62. The fixing ring 23 and the material table frame 20 are locked tightly by screws 64, and the outer ring of the middle bearing 62 is clamped and fixedly connected together. Preferably, the screws 64 pass through the corresponding holes on the material table frame 20 and are tightened onto the fixing ring 23. In this way, the substrate 11 can be arranged above the central shaft 10, and it is also convenient to disassemble and assemble the screws 64. Such a structure can reliably and conveniently fix the material table frame 20 to the outer ring of the bearing 62. Preferably, a first stepped hole is arranged in the inner hole of the material table frame 20, and the first stepped hole limits the lower side (lower surface) and the outer circle of the outer ring of the bearing 62. A second stepped hole is arranged in the inner hole of the fixing ring 23, and the second stepped hole limits the upper side and the outer circle of the outer ring of the bearing 62. In this way, the material table frame 20, the fixing ring 23 and the middle bearing 62 can be accurately positioned and firmly connected. A stepped shaft can also be arranged on the central shaft 10 to limit the inner ring and the upper side of the bearing 62. The bearing 62 is sleeved on the central shaft 10, and an external thread is arranged at the lower end of the central shaft 10. The bearing 62 can be locked to the central shaft 10 by a locking nut 63. Of course, the locking nut 63 can also be replaced by a shaft retaining ring 65. For example, a ring groove can be arranged on the central shaft 10, and the shaft retaining ring 65 is stuck in the ring groove to limit the bearing 62. A central through hole 109 can also be arranged on the central shaft 10 along the axis 91. A first conductive slip ring 51 can be arranged in the central through hole 109. The first conductive slip ring 51 includes a first slip ring 511 and a second slip ring 512 that can rotate relative to each other, and a plurality of conductive lines between the first slip ring 511 and the second slip ring 512 can be kept in corresponding conduction during the relative rotation. For example, the first slip ring 511 of the first conductive slip ring 51 is connected to the material table frame 20. Specifically, for example, the first slip ring 511 is connected to the material table frame 20 by a wire led out from the first slip ring 511. The second slip ring 512 is fixedly connected to the central shaft 10. For example Figure 6 as shown, the flange on the second slip ring 512 is connected to the locking nut 63 tightened on the central shaft 10 by a fixing screw 641 to realize the connection between the second slip ring 512 and the central shaft 10. In order to prevent the locking nut 63 from sliding, such as Figure 6 and Figure 7As shown, a washer 651 is provided between the lock nut 63 and the bearing 62. The inner side of the washer 651 protrudes and is stuck into a groove on the central shaft 10 (not shown in the figure), and the outer side protrudes and is stuck into a groove on the lock nut 63, preventing the lock nut 63 from sliding relative to the central shaft 10. The wire connected to the first slip ring 511 on the first conductive slip ring 51, for example, is led out from below the first conductive slip ring 51 and can be used to connect to electrical or detection devices on the material table frame 20 or the print head, such as the feeder 35, the heating block 75, the temperature sensor, the position or rotation angle sensor 53, etc. The wire connected to the second slip ring 512, for example, is led out from above the first conductive slip ring 51 and can be connected to a controller (not shown in the figure). A computer program can run in the controller to control the electrical devices on the material table or the print head and then collect the sensor signals on the material table or the print head.

[0079] Figure 4 It is also schematically shown that a passage can be provided at the central axis position of the first conductive slip ring 51, and this passage can be used for gas transmission. For example, the lower end of this passage is connected to the air supply pipe 44, and the gas or compressed air above the first conductive slip ring 51 can be transmitted to the print head through the passage and the air supply pipe 44.

[0080] The central shaft 10 can be directly fixedly connected to the frame 19 of the 3D printing device. Of course, it can also be as Figure 5 [[ID=⑨]]、 Figure 6 and Figure 7 It is also schematically shown that a substrate 11 can be fixedly connected above the central shaft 10. As Figure 6 shown, and then it is fixedly connected to the frame 19 of the 3D printing device through the substrate 11. The motor 61 that drives the fixed ring 23 or the material table frame 20 to rotate through the synchronous belt 66 or the gear pair can also be connected to the substrate 11. In this way, an assembly module of the material table can be formed, which is more conducive to modular disassembly and assembly of the material table assembly module to the 3D printing device frame. For example, on the side of the substrate 11 away from the material table frame 20 is the installation interface with the 3D printing device. For example, threaded holes are provided on this side surface for screwing the substrate 11 to the frame 19 by passing screws through the through holes on the frame 19 corresponding to the threaded holes on the substrate 11, as Figure 6 shown. A groove 111 can also be provided on the side of the substrate 11 away from the material table frame 20. As Figure 5 and Figure 6 shown, this groove 111 can be used to accommodate wires 52 or pipelines. A substrate hole is provided on the substrate 11 corresponding to the central through hole 109 of the central shaft 10. This substrate hole can allow wires or pipelines to pass through the substrate 11 and communicate with the groove 111. For example, the wire 52 or pipeline is connected to the groove 111 through the central through hole 109 and the substrate hole. An isolation plate 18 can also be provided between the substrate 11 and the frame 19. As Figure 6As shown, the partition plate 18 can be used to cover the groove 111 to prevent the substrate 11 from pressing on the wire 52 or the pipeline during the process of the substrate 11 being pressed against the frame 19. The partition plate 18 can also be made of an insulating material, such as plastic, which can be used for insulation protection and also for sealing between the substrate 11 and the frame 19.

[0081] Preferably, the driving mechanism is arranged above the bearing 62. For example, the synchronous belt 66 and the synchronous belt pulley (such as the linkage pulley 81 fixed on the fixing ring 23) for driving the material table frame 20 to rotate are arranged above the bearing 62 (on the side of the bearing 62 away from the print head). In this way, there is a larger space below the synchronous belt for arranging the material tray 31 or other material source devices. The material table frame 20 is arranged on the side of the bearing 62 close to the print head, which is more convenient for installing the material source device and conveying the printing material to the print head. Preferably, the synchronous belt 66, the motor 61, and the synchronous belt pulley (linkage pulley 81) are all arranged below the substrate 11, and the central shaft 10 is fixedly connected to the lower surface of the substrate 11, so that the upper surface of the substrate 11 can be used as the installation surface, which is more convenient for the entire material table assembly module to be installed on the frame 19 of the 3D printing device. Reducing the occupation of the space above the substrate 11 is beneficial to reducing the volume of the 3D printing device.

[0082] As Figure 3 and Figure 5 As shown, a plurality of material trays can be arranged on the material table frame 20, including the material tray 31 and the auxiliary material tray 32, etc. Among them, the auxiliary material tray 32 can wind the continuous fiber filament printing material and can be used to form a composite material printing model. Preferably, the material tray 31 and the auxiliary material tray 32 are arranged relatively with respect to the axis 91 of the material table frame 20. As Figure 5 shown, in this way, it is easier to maintain dynamic balance when the material table rotates and reduce the space occupied by the turning radius. The feeder 35 and the auxiliary feeder 36 can also be arranged on the material table frame 20. The feeder 35 can convey the corresponding printing material to the print head through the feeding pipe 37, and the auxiliary feeder 36 can convey the corresponding printing material to the print head through the auxiliary feeding pipe 38. Of course, the feeder 35 can also be arranged on the nozzle seat 71 of the print head. Figure 5 As shown in the figure, the motor 61 for driving the synchronous belt 66 can be installed on the substrate 11 through the motor bracket 611 on the same side of the substrate 11 and the material table frame 20. The synchronous belt 66 can also be tensioned by adjusting the distance between the motor 61 and the material table frame 20.

[0083] Figure 5 As shown in the figure, a material table bin 39 can also be arranged. The material table bin 39 can enclose the material tray 31 and the material tray 32 in the material table bin, which is beneficial to keeping the printing material on the material tray 31 and the material tray 32 free from moisture or pollution by dust, etc. A material table bin through hole 391 is arranged at the lower position of the material table bin 37 so that the feeding pipe, the wire, etc. can be connected from the material table frame to the nozzle seat on the print head. Preferably, the rotation axis of the material table frame passes through the material table bin through hole 391. Figure 5 andFigure 7 It is shown in the figure that the feeder 35 and the feeder 36 are arranged on the material table frame 20 or the bracket 22 of the material table frame. The material trays 31 and 32 can also be arranged on the material table frame. Figure 7 For the convenience of display, the material tray 32 is omitted in the figure. The feeding outlets of the feeder 35 and the feeder 36 can be inclined in the direction of approaching each other. It can be that the discharge outlet of the feeder 35 is inclined towards the discharge outlet of the feeder 36, or the discharge outlet of the feeder 36 is inclined towards the discharge outlet of the feeder 35, or the discharge outlets of the feeder 35 and the feeder 36 are both inclined and inclined in the direction of approaching each other at the same time, or inclined in the direction of the rotation axis of the material table frame, or inclined in the direction of the material table bin through hole 391. For example, Figure 5 in the figure, the feeding pipe 37 led out from the discharge outlet of the feeder 35 and the feeding pipe 38 led out from the discharge outlet of the feeder 36 are inclined and approach each other. Figure 7 in the figure, the printing material 33 sent out by the feeder 33 and the printing material 34 sent out by the feeder 36 are sent out in an inclined direction of approaching each other. In this way, after the feeding pipes 37 and 38 are led out from the feeding outlets of the feeder 35 and the feeder 36, they can approach and fit each other within a short distance downward, reducing the length of the feeding pipes extending downward by bending towards each other, which is beneficial to reducing the distance between the feeder and the printing head below, and also beneficial to reducing the distance between the feeder and the material table bin through hole. It is beneficial to reduce the volume of the material table bin and the volume of the 3D printing device.

[0084] Figure 6 It is shown in the figure that the central shaft 10 can also be integrally formed with the substrate 11, and the motor bracket 611 can also be integrally formed with the substrate 11. In this way, the structure can be greatly simplified, the assembly can be reduced, and the structure is more stable and compact.

[0085] The bearing 62 can be a deep groove ball bearing (as shown in Figure 1 and Figure 2 ), an angular contact ball bearing, a double row angular contact ball bearing (as shown in Figure 3 and Figure 4 ), or multiple bearings are arranged coaxially (as shown in Figure 5 and Figure 6 ). For example, two bearings are arranged side by side in contact, such as two angular contact ball bearings are arranged in contact face to face or back to back. Figure 5It is shown that two angular contact ball bearings are arranged back-to-back. The lower surface and the outer surface of the outer ring of the lower bearing 62 are in contact with the material table frame 20. The upper surface and the outer surface of the outer ring of the upper bearing 62 are in contact with the fixing ring 23. The fixing ring 23, the outer ring of the upper bearing 62, the outer ring of the lower bearing 62 and the material table frame 20 are locked together by screwing the screw 64 through the material table frame 20 and tightening it to the fixing ring 23. A spacer ring 651 can also be arranged between the bearing 62 and the locking nut 63, which is convenient for the installation of the locking nut 63 and also convenient for adjusting the distance from the locking nut 63 to the lower surface of the central shaft 10. For example, it is convenient to adjust the installation of the first conductive slip ring 51 to the locking nut 63. Figure 6 It is shown that two bearings 62 are arranged at intervals. The upper end of the fixing ring 23 is in contact with the outer surface and the lower surface of the outer ring of the upper bearing. The lower end of the fixing ring 23 is in contact with the outer surface and the upper surface of the outer ring of the lower bearing. The lower surface and the outer surface of the outer ring of the lower bearing are in contact with the material table frame, and the fixing ring, the outer ring of the lower bearing and the material table frame are locked together by screwing a screw through the material table frame and tightening it to the fixing ring. The linkage wheel 81 is arranged between the two bearings 62 up and down, which is beneficial to improving the stability of the structure.

[0086] A sensor 53 can also be arranged on the material table, such as Figure 3 shown, for detecting the initial rotation position or the rotation angle of the material table frame 20 relative to the central shaft 10. Preferably, the power-consuming part of the sensor 53 is connected to the central shaft 10. A sensor 53 can also be arranged on the print head, such as Figure 2 shown, for detecting the initial rotation position or the rotation angle of the nozzle seat 71 relative to the print seat. Preferably, the power-consuming part of the sensor 53 is connected to the nozzle seat 71.

[0087] The material table frame 20 can be driven to rotate in various ways. For example Figure 2 、 Figure 5 and Figure 6 It is shown that the material table frame 20 is driven to rotate by the motor 61 driving the synchronous belt 66. Figure 3 It is shown that the motor 61 drives the material table frame 20 to rotate through a gear pair.

[0088] Figure 7Schematically shows driving the turntable 20 to rotate and move through a linear-angle coupling mechanism. Specifically, the linear-angle coupling mechanism includes a linkage wheel 81, a left synchronous belt 67, and a right synchronous belt 68. The linkage wheel 81 is a synchronous pulley, which can be the synchronous pulley teeth on the turntable 20, or the synchronous pulley teeth on the fixed ring 23, or the linkage wheel 81 is coaxially fixedly connected to the turntable 20 or the fixed ring 23. The left synchronous belt 67 and the right synchronous belt 68 are respectively meshed with the linkage wheel 81 on the opposite sides of the linkage wheel 81, and the left synchronous belt 67 and the right synchronous belt 68 are arranged offset in the axial direction of the turntable 20. The left synchronous belt 67 is stretched by a first synchronous pulley 82 and a second synchronous pulley 83 along the guide rail 69, and the right synchronous belt 68 is stretched by a third synchronous pulley 84 and a fourth synchronous pulley 85 along the guide rail 69. The central shaft 10 can move along the guide rail 69. For example, the central shaft 10 can be fixedly connected (or integrally formed) to the substrate 11, and the substrate 11 can move along the guide rail 69. Further, the synchronous belt can be guided by guide wheels. For example, the first guide wheel 86 and the second guide wheel 87 are respectively abutted against the back surface of the left synchronous belt 67 on both sides of the linkage wheel 81 along the direction of the guide rail 69 for guiding, and the third guide wheel 88 and the fourth guide wheel 89 are respectively abutted against the back surface of the right synchronous belt 68 on both sides of the linkage wheel 81 along the direction of the guide rail 69 for guiding. And preferably, the first guide wheel 86, the second guide wheel 87, the third guide wheel 88, and the fourth guide wheel 89 can be respectively rotatably arranged on the base 11. Driven by the left synchronous belt 67 and the right synchronous belt 68, the turntable 20 can rotate along its own axis, as shown by the arrow Φ, and move along the direction of the guide rail 69. The track 69 is fixed on the base 12. The guide rail 69 is fixedly connected to the base 12. The first synchronous pulley 82, the second synchronous pulley 83, the third synchronous pulley 84, and the fourth synchronous pulley 85 are rotatably arranged on the base 12. Further, the base 12 can be Figure 6 the frame 19 in Figure 6 or the various components of the turntable are combined into a module through the base 12, and can be installed on the frame 19 in

[0089] The nozzle seat 71 of the print head can be driven to rotate in a variety of ways. For example Figure 1The figure shows that the nozzle seat 71 is driven to rotate and move by a line angle coupling mechanism. A linkage wheel 81 is set on the nozzle seat 71. The linkage wheel 81 is a synchronous belt pulley. The left synchronous belt 67 and the right synchronous belt 68 are respectively engaged with the linkage wheel 81 on opposite sides of the linkage wheel 81, and the left synchronous belt 67 and the right synchronous belt 68 are staggered along the axial direction of the nozzle seat 71. The synchronous belt can also be guided by a guide wheel. For example, the first guide wheel 86 and the second guide wheel 87 are respectively abutted against the back of the left synchronous belt 67 on both sides of the linkage wheel 81 for guidance, and the third guide wheel 88 and the fourth guide wheel 89 are respectively abutted against the back of the right synchronous belt 68 on both sides of the linkage wheel 81 for guidance, and the best first guide wheel 86 and the fourth guide wheel 89 are coaxially arranged, and the second guide wheel 87 and the third guide wheel 88 are coaxially arranged. Driven by the left synchronous belt 67 and the right synchronous belt 68, the nozzle seat 71 can rotate along its own axis, as shown by the arrow θ, and move along the guide rail 69. Figure 2 As shown in the figure, the nozzle holder 71 can be driven to rotate by the print head motor 611 through a synchronous belt, and the print head motor 611 is fixedly connected to the print holder 72.

[0090] Figure 8 A schematic diagram showing the direction of the axis 91 of the vertical material rack 20, wherein the axis 91 is perpendicular to the drawing, i.e. Figure 8 As shown in the bottom view, the material tray 31, the feeder 35, the auxiliary material tray 32, and the auxiliary feeder 36 are arranged in sequence around the axis 91 of the material stand 20. Optimally, the first drive motor 351 of the feeder 35 is set in a direction away from the axis 91 of the material stand 20 relative to the feeder 35, and the second drive motor 361 of the feeder 36 is set in a direction away from the axis 91 of the material stand 20 relative to the auxiliary feeder 36. This results in a compact spatial arrangement, a small moment of inertia, and relatively good dynamic balance of rotation. Furthermore, since the feeder 35 is set inward relative to the first drive motor 351 and the auxiliary feeder 36 is set inward relative to the second drive motor 361 (close to the axis 91), the discharge ports of the two feeders are closer together, and the two feeding tubes can be better brought together for transmission to the print head.

[0091] The feed pipe 37 , the air supply pipe 44 and the ink supply pipe are all made of flexible tubes with elasticity, for example, they can be made of polytetrafluoroethylene (Teflon) material.

[0092] The filamentous printing material in the present invention can be a thermoplastic resin material, which can be in the shape of a line or a strip. The continuous fiber printing material can be various continuous fiber materials or wire materials, which can be in the shape of a line or a strip. The particulate printing material can be a particulate plastic material similar to that commonly used in the traditional injection molding industry. Whether the printing material needs to be heated in the present invention is not a limitation, that is, it can be a molten extruded printing material or a printing material that can be cured after being extruded in a flowing state, such as slurry. The filamentous printing material (or simply referred to as filament) can be various resin materials, such as PLA, ABS, PA, or PEEK, etc., and can also be fiber materials, such as carbon fiber filaments, glass fiber filaments, basalt fibers, or aramid fibers pre-impregnated with resin. The filament can be in the shape of a filament, a line, or a strip. For example, resin filaments with a diameter of 1.75 mm or 3 mm are used. The continuous fiber printing material (or referred to as continuous fiber filament) can be a fiber material, a wire material (such as a copper wire), an optical fiber material, or other continuous linear materials, and can be a continuous fiber material pre-impregnated with resin. Continuous fiber materials such as carbon fiber, glass fiber, polyester, aramid, ceramic fiber, boron fiber, or basalt fiber, etc. The resin material used for pre-impregnating the continuous fiber can be a thermoplastic resin material, such as epoxy resin, PLA (polylactic acid), PP (polypropylene), PE (polyethylene), ABS (acrylonitrile butadiene styrene), PA (polyamide) (nylon), PC (polycarbonate), PS (polystyrene), PEI (poly(etherimide)), PET (poly(ethylene terephthalate)), PEEK (polyetheretherketone), TPU (thermoplastic polyurethanes), etc. Of course, it can also be a thermosetting resin material or a photosensitive polymerizable resin material, or other materials that can be extruded in a flowing state.

[0093] In the text, "vertical" or "parallel" means theoretically precise, but in actual production or installation, there are errors, such as an error less than ±45 degrees, or an error less than ±30 degrees, or an error less than ±15 degrees, or an error of ±40%. The use of directional terms such as "upper", "lower", "left", and "right" in the text is for the convenience of description based on the specific drawings and is not a limitation of the present invention. In actual applications, due to the transformation of the overall structure in space, the actual left or right position may be different from that in the drawings. However, all these transformations should be within the protection scope of the present invention.

[0094] Parts not involved in the present invention are the same as or can be implemented using the prior art. The above description is only a preferred embodiment of the present invention and does not impose any formal restrictions on the present invention. Although the present invention has been disclosed above in a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art, without departing from the technical solution of the present invention, can make some changes or modifications to equivalent embodiments by using the above-disclosed technical content. However, as long as it does not depart from the technical solution of the present invention, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A 3D printing system with a rotating material table, characterized in that, Comprising: A print head, the print head includes a print base and a nozzle base rotatably arranged on the print base, and at least one extrusion port for extruding printing material is provided at the bottom of the nozzle base; A material table, the material table includes a material table frame, a central shaft, a bearing and at least one feeding component for conveying printing material to at least one of the extrusion ports, the material table frame is rotatable relative to the central shaft, the bearing includes an outer ring and an inner ring that can rotate relative to each other, the material table frame is fixedly connected to the outer ring, the central shaft is fixedly connected to the inner ring, and at least one of the feeding components is installed on the material table frame and can rotate together with the material table frame; Wherein, a flexible circuit is connected between the material table frame and the nozzle base, the flexible circuit includes a printing material transmission circuit formed between the feeding component and the extrusion port for transmitting printing material, and the material table frame rotates following the nozzle base to prevent or reduce winding of the flexible circuit.

2. The 3D printing system with a rotating material platform according to claim 1, characterized in that, A fixing ring is fixedly arranged on the outer periphery of the upper part of the outer ring, the outer periphery of the lower part of the outer ring is fixed to the material table frame, the fixing ring and the material table frame are fixedly connected to each other, a first stepped hole for sleeving the outer ring and limiting the outer ring at the upper part is provided inside the fixing ring, and a second stepped hole for sleeving the outer ring and limiting the outer ring at the lower part is provided inside the material table frame; Or, the number of the bearings is two, and the two bearings are arranged in abutting contact, the upper surface and the outer surface of the outer ring of the upper bearing are in abutting contact with the fixing ring, the lower surface and the outer surface of the outer ring of the lower bearing are in abutting contact with the material table frame, and the fixing ring, the outer ring of the upper bearing, the outer ring of the lower bearing and the material table frame are locked together by screwing the screw through the material table frame and tightening it to the fixing ring; Or, the number of the bearings is two, and the two bearings are arranged at intervals, the upper end of the fixing ring is in abutting contact with the outer surface and the lower surface of the outer ring of the upper bearing, the lower end of the fixing ring is in abutting contact with the outer surface and the upper surface of the outer ring of the lower bearing, the lower surface and the outer surface of the outer ring of the lower bearing are in abutting contact with the material table frame, and the fixing ring, the outer ring of the lower bearing and the material table frame are locked together by screwing the screw through the material table frame and tightening it to the fixing ring; And / or, a boss is formed by extending the upper part of the central shaft outward and is clamped on the top surface of the inner ring, and the bottom surface of the inner ring is fixed to the central shaft through a fastening member.

3. The 3D printing system with a rotating material platform according to claim 2, wherein, The material table further includes a first driving mechanism for driving the material table frame to rotate: The first driving mechanism includes a first motor, a synchronous pulley fixed on the output shaft of the first motor, a synchronous belt tooth fixed on the fixing ring, and a first synchronous belt engaged and connected between the synchronous pulley and the synchronous belt tooth; a substrate is fixed on the upper part of the central shaft, the first motor and the first synchronous belt are both arranged on the side of the substrate facing the material table frame, and the first motor is fixedly connected to the substrate; Or the first driving mechanism includes a second motor and a gear pair connected between the second motor and the fixing ring; Alternatively, the first driving mechanism includes a third motor having a hollow shaft, and the third motor is sleeved and fixed on the outer periphery of the material table frame or the outer periphery of the fixed ring; Alternatively, the first driving mechanism includes a first line-angle coupling mechanism for driving the material table frame to rotate and move, and the material table frame or the fixed ring is coaxially and fixedly connected to the linkage wheel of the first line-angle coupling mechanism.

4. The 3D printing system with a rotating material table according to claim 1, characterized in that, The nozzle seat is provided with a through hole along the axial direction for the flexible circuit to pass through.

5. The 3D printing system with a rotating material platform according to claim 1, characterized in that, The central shaft is provided with a central through hole along the axial direction.

6. The 3D printing system with a rotating material platform according to claim 5, characterized in that, A first conductive slip ring is arranged in the central through hole. The first conductive slip ring includes a first slip ring and a second slip ring that can rotate relative to each other, and the first slip ring and the second slip ring can maintain electrical connection during relative rotation. The first slip ring is fixed to the material table frame, and the second slip ring is fixed to the central shaft; alternatively, a second conductive slip ring is arranged on the print head. The second conductive slip ring includes a third slip ring and a fourth slip ring that can rotate relative to each other, and the third slip ring and the fourth slip ring can maintain electrical connection during relative rotation. The third slip ring is fixed to the nozzle seat, and the fourth slip ring is fixed to the print seat.

7. The 3D printing system with a rotating material platform according to claim 5, characterized in that, A substrate is fixed to the upper part of the central shaft, or the central shaft is integrally formed with the upper substrate. A groove for accommodating wires and / or pipelines is arranged on the side of the substrate away from the material table frame, and the groove communicates with the central through hole.

8. The 3D printing system with a rotating material platform according to claim 7, characterized in that, The material table is mounted on the frame of the 3D printing device through the substrate. The surface of the substrate away from the material table frame abuts against the frame of the 3D printing device, or a separator is arranged between the surface of the substrate away from the material table frame and the frame of the 3D printing device.

9. The 3D printing system with a rotating material platform according to claim 1, wherein, The feeding component is a material tray, a feeder or a feeding device; The flexible circuit is a filamentous printing material, a feeding pipe, a wire, an air supply pipe or an ink supply pipe; wherein, the air supply pipe is used to transmit the air source on the material table frame to the nozzle seat, and the air source is a blower arranged on the material table frame or an air supply passage passing through the central through hole arranged along the axial direction of the central shaft; the feeding pipe is used to transmit the printing material from the feeding component on the material table frame to the nozzle seat; the wire is used to connect the circuit from the material table frame to the electrical components on the nozzle seat; the ink supply pipe is used to connect the ink cartridge to the inkjet head mounted on the nozzle seat. Or, The bearing is a deep groove ball bearing, an angular contact ball bearing, a double row angular contact ball bearing, two angular contact ball bearings are arranged face to face or back to back, or two bearings are arranged at an axial distance.

10. The 3D printing system with a rotating material table according to claim 1, characterized in that, The bottom of the nozzle seat includes at least two extrusion ports, and at least two of the extrusion ports are respectively used for extruding printing materials; wherein, At least two feeding drives are arranged on the material table frame. The two feeding drives are arranged on the material table frame and can rotate together with the material table frame. The two feeding drives are used to respectively convey filamentous printing materials to at least two of the extrusion ports; the directions of the filamentous printing materials respectively conveyed by the two feeding drives are inclined downward and close to each other, or the discharge ports of the two feeding drives are inclined downward in the direction close to the rotation axis of the material table frame. Or, A first material tray, a first feeder, a second material tray and a second feeder are arranged on the material table frame. The first material tray, the first feeder, the second material tray and the second feeder are arranged in sequence around the rotation axis of the material table frame in a circumferential manner. The drive motor of the first feeder is arranged in a direction away from the rotation axis of the material table frame relative to the first feeder, and the drive motor of the second feeder is arranged in a direction away from the rotation axis of the material table frame relative to the second feeder.

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