CN107498854B - Ultrasonic plasticizing fused deposition modeling 3D printing device - Google Patents

Abstract

The invention provides an ultrasonic plasticizing fused deposition modeling 3D printing device which comprises a support, a printing unit, a printing head unit and a material melting unit, wherein the printing head unit is used for transferring a molten material to the printing unit for printing; the support comprises a first working platform provided with a printing head unit and a material melting unit and a second working platform provided with a printing unit; the material melting unit comprises an ultrasonic system for melting materials, a quantifying device and a driving system for driving the ultrasonic system to move, and the quantifying device comprises a connecting rod, a left plate and a right plate; one end of the connecting rod is arranged in the cavity of the second base, and the other end of the connecting rod extends out of the cavity and is connected with the ultrasonic system through the first connecting plate; the left plate is arranged in the cavity and is fixed with one end of the connecting rod arranged in the cavity; the right board corresponds the left board setting and sets up the certain distance in the cavity and between right board and the left board, and right board cover is established on the connecting rod and can be followed the connecting rod and removed. The ultrasonic melting method is adopted for melting, so that the melting speed is higher.

Description

Ultrasonic plasticizing fused deposition modeling 3D printing device

Technical Field

The invention relates to the technical field of 3D printing, in particular to an ultrasonic plasticizing, melting, depositing and forming 3D printing device.

Background

In recent years, 3D printing technology is increasingly used to manufacture parts, and the technical characteristics of layer-by-layer manufacturing can be faster and more personalized than the conventional manufacturing technology. This technology has wide application in the fields of weaponry, automotive, medical, construction, but 3D printing technology is still in the stage of development due to limitations in machine size, materials, cost, etc.

At present, the raw material forms of 3D printing mainly comprise three forms of thread form, powder form and particle form, the processing principles of corresponding 3D printing equipment are slightly different due to different material forms, wherein the particle material is a novel material form, the price is cheaper, the material is easy to prepare, and the material performance is excellent.

The working principle of the 3D printer using the filamentous materials is a fused deposition technology, the device has a simple structure, low forming precision and relatively low forming speed; the working principle of the 3D printer using the powdery material is a powder curing and sintering technology, and the device can be used for manufacturing a complex component or a die, but the surface of a sample piece is rough and granular; the 3D printer theory of operation that uses granular materials is the fused deposition technique also, has only used the integrated configuration of screw rod and heating coil, specifically for set up heating coil melting material in feed inlet department, then uses the screw rod rotation to cut the material and extrude nozzle department, and its structure is nevertheless to some complicacies, and the machining precision is higher relatively, but the screw rod structure has two major disadvantages: 1. the diameter of the screw is larger: a screw can be obtained by machining threads on one shaft, so that the diameter of the screw cannot be too small, otherwise the screw is broken at the tooth root; 2. the materials are easy to deteriorate: because the heating coil needs a certain time to melt the material, the material stays in the charging barrel for a longer time.

Disclosure of Invention

The invention aims to provide a 3D printing device which is simple in structure and convenient to operate, so that the purpose of quick and quantitative printing can be achieved.

In order to achieve the purpose, the invention provides an ultrasonic plasticizing fused deposition modeling device, which comprises a bracket, a printing unit, a printing head unit and a material melting unit, wherein the printing head unit is arranged on the bracket;

the support comprises a first working platform and a second working platform which are arranged up and down, the first working platform is provided with the printing head unit and the material melting unit, and the second working platform is provided with the printing unit;

the material melting unit comprises an ultrasonic system, a quantifying device and a driving system, wherein the quantifying device comprises a connecting rod, a left plate and a right plate;

one end of the connecting rod is arranged in the cavity of the second base, and the other end of the connecting rod extends out of the cavity and is connected with the ultrasonic system through a first connecting plate, so that the quantifying device and the ultrasonic system can synchronously move;

the left plate is arranged in the cavity and is fixed with one end of the connecting rod arranged in the cavity; the right plate is arranged in the cavity corresponding to the left plate, and a certain distance is arranged between the right plate and the left plate; the right plate is sleeved on the connecting rod and can move along the connecting rod, so that the distance between the right plate and the left plate is adjusted to control the amount of materials;

the ultrasonic system is used for melting the material, and the driving system is used for driving the ultrasonic system to move back and forth, so that the ultrasonic system melts the material measured by the quantitative device; the printing head unit is used for transferring the molten material to the printing unit for printing.

Particularly, the ultrasonic system comprises a tool head, a horn and a transducer which are connected in sequence, wherein a first end of the tool head extends into a second end of a horizontal channel arranged on a first base, and a second end of the tool head is connected with the transducer through the horn; the first base is fixed on the first working platform and arranged below the second base; the horizontal channel is matched with the tool head in size, so that the tool head can move back and forth in the horizontal channel; the outer side of the first end of the horizontal channel is connected with a connecting channel, and the connecting channel is communicated with the printing head unit, so that materials melted by an ultrasonic system can enter the printing head unit through the connecting channel.

In particular, the connection channel employs a spring needle valve type nozzle, and the opening of the spring needle valve type nozzle faces the print head unit.

In particular, the upper surface of the second base is provided with a cartridge, the outlet of which opens into the cavity; a channel is arranged below the cavity, and two ends of the channel are respectively connected with the cavity and the horizontal channel; the channel is disposed proximate to the first end of the horizontal channel.

Particularly, the driving system adopts ball screw transmission and comprises a driving guide groove arranged on the first working platform and a driving sliding table moving along the driving guide groove; the transducer pass through the third L shape connecting plate with the drive slip table is connected, the riser cover of third L shape connecting plate is established the stagnation point department of transducer, its diaphragm with the drive slip table is connected for actuating system's drive slip table just can drive ultrasonic system when sliding forward.

Particularly, the printing head unit comprises a speed increasing mechanism and a crank link mechanism, wherein the speed increasing mechanism is used for providing power for the movement of the crank link mechanism;

the speed increasing mechanism comprises a motor, a coupler, a large gear and a small gear, and the motor is arranged on a motor base; two ends of the coupler are respectively connected with the motor and the big gear, the big gear is meshed with the small gear, the motor drives the coupler to rotate, and further drives the big gear to rotate, so that the small gear is driven to rotate;

the crank-connecting rod mechanism comprises two eccentric cranks, a connecting rod and a piston, the two eccentric cranks are mutually connected through a connecting piece and are respectively fixed on the inner side wall of the printing head base, one of the eccentric cranks is connected with the pinion, and the rotation of the pinion drives the two eccentric cranks to rotate; the connecting rod is arranged on a connecting piece between the two eccentric cranks and can move up and down along with the rotation of the eccentric cranks; the top end of the piston is connected with the lower end of the connecting rod, the lower end of the piston is in a conical tip shape, and the piston can move up and down in a pore channel of the printing head base along with the connecting rod, so that the piston can extrude molten materials in the piston; the side wall of the piston is also provided with a short pipe which is communicated with the connecting channel and the piston.

Particularly, a printing nozzle is arranged below the printing head base, and the printing nozzle is detachably connected with the printing head base, so that the printing nozzle is convenient to replace; the lower end of the piston opens into the print nozzle.

In particular, the heating coil is arranged on the outer side of the lower part of the printing head base and used for keeping the temperature of the materials and preventing the materials from deteriorating.

Particularly, the printing unit comprises a printing platform, an X-direction module, a Y-direction module and a Z-direction module, wherein the X-direction module, the Y-direction module and the Z-direction module are driven by ball screws, and the printing unit at least comprises a group of X-direction modules;

the X-direction module comprises an X-direction guide groove and an X-direction sliding table moving along the X-direction guide groove, and the X-direction guide groove is arranged on the second working platform; a sliding groove is formed in the second working platform in parallel with the X-direction sliding groove, a first roller moving along the sliding groove is arranged in the sliding groove, and the upper surface of the first roller and the upper surface of the X-direction sliding table are located on the same horizontal plane;

the Y-direction module comprises a Y-direction guide groove and a Y-direction sliding table moving along the Y-direction guide groove; the X-direction module and the Y-direction module are connected by a first L-shaped connecting plate which is vertically arranged, one end of a transverse plate of the first L-shaped connecting plate is arranged on the upper surface of the X-direction sliding table, the other end of the transverse plate of the first L-shaped connecting plate is arranged on the upper surface of the first roller, and the Y-direction guide groove is arranged on a vertical plate of the first L-shaped connecting plate;

the Z-direction modules comprise Z-direction guide grooves and Z-direction sliding tables moving along the Z-direction guide grooves, and the back surfaces of the Z-direction guide grooves are directly or indirectly connected with the Y-direction sliding tables;

the printing platform is connected with the Z-direction sliding table through a second L-shaped connecting plate, and the second L-shaped connecting plate is arranged below the printing platform.

The technical scheme of the invention has the following beneficial effects:

1. by carrying out stress-strain analysis on the ultrasonic vibration system, the minimum diameter of the front end of the tool head can be reduced to 5mm under the condition of meeting the strength (the maximum strain of the tool head is less than 0.1mm, and the maximum stress is less than 2 Mpa), and compared with the prior art that the minimum diameter of a screw is 12mm, the minimum diameter is reduced by nearly half, so that the 3D printing device is smaller in size and more compact in structure.

2. Compared with a coil heating mode, the mode of the ultrasonic system is adopted for melting, so that the materials are quickly melted under the combined action of ultrasonic vibration and pressure, the melting speed of the materials is higher, the mode is more energy-saving, more convenient to control and higher in melting quality.

3. The device can change the discharge amount by adjusting the diameter of the discharge port of the printing nozzle and adjusting the volume (thread structure) of the quantitative device, thereby being suitable for different processing occasions and different precision requirements.

4. The device provided by the invention is used for melting through the ultrasonic system and then performing heat preservation treatment by using the heating coil, so that the material cannot deteriorate in the operation process, and the printing quality is higher.

5. The whole device has compact structure, light weight and easy manufacture.

In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail below with reference to the drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.

In the drawings:

fig. 1 is a schematic view of the internal overall structure of a 3D printing apparatus in embodiment 1;

fig. 2 is a schematic view of the external overall structure of the 3D printing apparatus in embodiment 1;

fig. 3 is a schematic configuration diagram of a printing unit of the 3D printing apparatus in embodiment 1;

fig. 4 is a schematic structural view of a print head unit of the 3D printing apparatus in embodiment 1;

fig. 5 is a schematic structural diagram of a material melting unit of the 3D printing apparatus in embodiment 1;

fig. 6 is a schematic structural diagram of connection between a print head unit and a material melting unit of the 3D printing apparatus in embodiment 1;

reference numerals:

1. a bracket 11, a first working platform 12, a second working platform 13, a feeding port 14, a material taking door 15, a door closer 16, a second roller 2, a printing unit 21, a printing platform 22, an X-direction module 221, an X-direction guide groove 222, an X-direction sliding table 23, a Y-direction module 231, a Y-direction guide groove 24, a Z-direction module 241, a Z-direction guide groove 25, a first L-shaped connecting plate 26, a sliding groove 27, a first roller 3, a printing head unit 30, a heating coil 31, a printing head base 311, a printing nozzle 32, a motor 33, a coupler 34 and a gearwheel, 35, pinion, 36, motor mount, 37, eccentric crank, 38, connecting rod, 39, piston, 391, stub pipe, 4, material melting unit, 41, ultrasonic system, 411, tool head, 412, horn, 413, transducer, 414, first connecting plate, 42, cartridge, 43, first base, 431, horizontal channel, 432, channel, 44, second base, 441, cavity, 45, dosing device, 451, connecting rod, 452, left plate, 453, right plate, 46, drive system, 461, drive channel, 462, drive slide, 463, third L-shaped connecting plate, 47, pogo pin valve nozzle.

Detailed Description

Embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways, which are defined and covered by the claims.

Example 1

Detailed description referring to fig. 1, an ultrasonic plasticizing fused deposition modeling 3D printing device includes a support 1, a printing unit 2, a printing head unit 3 and a material melting unit 4.

In this embodiment, the whole frame of the bracket is constructed by 4040 aluminum profiles, the profiles are connected by right-angle pieces, and the ends of the profiles are blocked by nylon cover plates; the bottom of the bracket is provided with a second roller 16, which is convenient for carrying the whole device.

The frame of support installs two flat boards through the right angle spare, and two flat boards divide into first work platform 11 and the second work platform 12 that set up from top to bottom with the frame, first work platform is provided with beat printer head unit and material melting unit, set up on the second work platform print the unit.

Referring to fig. 2 in detail, the frame of the support is externally wrapped by a baffle to prevent the external environment (such as dust in the air) from affecting the printing quality. The bracket is provided with an upper layer baffle, a middle layer baffle and a lower layer baffle, the three layers of baffles are fixed on the frame, and the baffle at the topmost part of the upper layer baffle is provided with a material inlet 13 which is convenient for dumping materials; the side baffle and the top baffle of the middle layer are made of acrylic material (PMMA), so that the transparency is good, and the processing process is convenient to observe; the bottom (lower) baffle acts as a wrap. A material taking door 14 is arranged on one side plate of the middle-layer baffle, the material taking door is opened in a vertically-overturning mode, and a door closer 15 is mounted on the material taking door to enable the door to be capable of automatically resetting.

In detail, referring to fig. 3, the printing unit includes a printing platform 21, an X-direction module 22, a Y-direction module 23, and a Z-direction module 24, all of which adopt ball screw transmission, and the printing platform can move in XYZ directions along with the X-direction module, the Y-direction module, and the Z-direction module.

The X-direction module comprises an X-direction guide groove 221 and an X-direction sliding table 222 moving along the X-direction guide groove, and the X-direction guide groove is arranged on the second working platform; the second work platform with X is to the guide way parallel arrangement has a spout 26, be provided with one in the spout and follow the first gyro wheel 27 of spout motion, the upper surface of first gyro wheel with X is to the upper surface of slip table and is located same horizontal plane.

The spout with the combination of first gyro wheel can also be replaced to the module with same X, two X is to guide groove parallel arrangement is in on the second work platform, the both ends of the diaphragm of first L shape connecting plate set up respectively at two X to the upper surface of slip table.

The spout with the combination of first gyro wheel can also be replaced to the module with same X, two X is to guide groove parallel arrangement is in on the second work platform, the both ends of the diaphragm of first L shape connecting plate set up respectively at two X to the upper surface of slip table.

The Y-direction module comprises a Y-direction guide groove 231 and a Y-direction sliding table moving along the Y-direction guide groove; x to the module with Y is connected to the first L shape connecting plate 25 that adopts vertical setting between the module, the diaphragm one end setting of first L shape connecting plate is in X to the upper surface of slip table, and the other end setting is in the upper surface of first gyro wheel, Y is followed to the guide way the length direction setting of the riser of first L shape connecting plate.

The Z-direction modules comprise Z-direction guide grooves 241 and Z-direction sliding tables moving along the Z-direction guide grooves, and the back surfaces of the Z-direction guide grooves are fixed on the Y-direction sliding tables.

The printing platform is connected with the Z-direction sliding table through a second L-shaped connecting plate, and the second L-shaped connecting plate is arranged below the printing platform.

The printing unit adopts the screw nut transmission, so that the printing platform can move in three directions with high precision, and the high-precision positioning enables printed products to have higher quality and more accurate size.

With particular reference to fig. 4, the printhead unit includes a speed increasing mechanism and a crank link mechanism.

The speed increasing mechanism comprises a motor 32, a coupler 33, a large gear 34 and a small gear 35, and the motor is arranged on a motor base 36; the two ends of the coupler are respectively connected with the motor and the gear wheel, the gear wheel is meshed with the pinion, and the motor drives the coupler to rotate, so that the gear wheel is further driven to rotate, and the pinion is driven to rotate. The speed increasing mechanism increases the rotating speed of the motor through the large gear and the small gear, so that greater power is provided for the crank link mechanism.

The crank-link mechanism comprises two eccentric cranks 37, a connecting rod 38 and a piston 39, the two eccentric cranks are mutually connected through a connecting piece and are respectively fixed on the inner side wall of the printing head base 31, one of the eccentric cranks is connected with the pinion, and the rotation of the pinion drives the two eccentric cranks to rotate; the connecting rod is arranged on a connecting piece between the two eccentric cranks and can move up and down along with the rotation of the eccentric cranks; the top end of the piston is connected with the lower end of the connecting rod through a pin, the lower end of the piston is in a conical tip shape, and the piston can move up and down in a pore channel of the printing head base along with the connecting rod, so that the piston can extrude molten materials in the piston; a short pipe 391 is also arranged on the side wall of the piston; the lower part of the printing head base is also provided with a printing nozzle 311, the lower end of the piston is communicated with the printing nozzle, and the printing nozzle is connected with the printing head base through threads, so that the printing nozzle is convenient to replace.

The connecting rod and the piston in the crank connecting rod structure are arranged inside the printing head base, but in order to clearly show the connecting structure of the connecting rod and the piston, the printing head base on the right side is vertically cut in fig. 4, namely, the structure outside the printing head base is removed, and the connecting rod and the piston are exposed.

Through big pinion, eccentric crank and connecting rod drive print piston reciprocating motion from top to bottom, this kind of mode can make 3D printing device's ejection of compact more even, and print quality is higher.

The outer side of the lower part of the printing head base is also provided with a heating coil 30, the temperature of the heating coil is constant, and the heating coil is used for keeping the temperature of the material, so that the material is prevented from deteriorating, and the printing quality is ensured.

Two lug plates are further arranged below the printing head base, and the printing head base is fixed on the first working platform through the lug plates by using bolts and nuts.

With particular reference to fig. 5-6, the material melting unit comprises an ultrasonic system 41 for melting the granular material, a dosing device 45 and a drive system 46.

The ultrasonic system comprises a tool head 411, a horn 412 and a transducer 413 which are sequentially connected through threads (reverse threads are adopted between the tool head and the horn and between the horn and the transducer for screwing, so that the ultrasonic vibration system does not loosen during operation); the first end of the tool head extends into the second end of the horizontal channel 431 provided in the first base 43, the second end of the tool head being connected to the transducer by means of a horn; the first base is fixed on the first working platform and arranged below the second base; the horizontal channel is matched with the tool head in size, so that the tool head can move back and forth in the horizontal channel; and a spring needle valve type nozzle 47 is connected to the outer side of the first end of the horizontal channel and communicated with the short pipe of the printing head unit, so that materials melted by an ultrasonic system can enter the printing head unit through the spring needle valve type nozzle. The injection pressure of the material can be adjusted by adjusting the spring force of the spring needle valve nozzle during printing, thereby adjusting the printing rate.

In order to reduce the influence of the vibration of the transducer on the 3D printing, a transducer cover can be sleeved outside the transducer; meanwhile, in order to cool the transducer, a fan can be additionally arranged at the tail part of the transducer.

The quantitative means comprises a connecting rod 451, a left plate 452 and a right plate 453; one end of the connecting rod is arranged in the cavity 441 of the second base 44, and the other end of the connecting rod extends out of the cavity and is connected with the ultrasonic system through a first connecting plate, so that the quantifying device and the ultrasonic system can move synchronously; one end part of the connecting rod, which is arranged in the cavity, is provided with a first thread; the second base is arranged above the first base; the left plate is arranged in the cavity and is fixed with the end part of one end of the connecting rod arranged in the cavity; the right plate is arranged in the cavity corresponding to the left plate, and a certain distance is arranged between the right plate and the left plate to form a quantitative chamber; the right plate is of an inverted concave structure, the right plate is sleeved on the connecting rod, a second thread matched with the first thread of the connecting rod is arranged on one side, away from the left plate, of the right plate, the connecting rod can enable the right plate to move along the connecting rod through rotation, and therefore the volume of the quantitative chamber is adjusted to control the amount of the materials.

A material barrel 42 is arranged on the upper surface of the second base, an outlet of the material barrel leads to the cavity, the upper part of an inlet of the material barrel corresponds to the feeding hole, and materials are poured into the material barrel through the feeding hole; a channel 432 (the channel can be in a slope or vertical form, but considering that the processing difficulty of the slope is high and the precision is not easy to guarantee in the actual production and manufacturing process, the vertical channel is preferred) is arranged below the cavity, and two ends of the channel are respectively connected with the cavity and the horizontal channel; the channel is disposed proximate the first end of the horizontal channel.

The driving system adopts ball screw transmission and comprises a driving guide groove 461 fixed on the first working platform and a driving sliding table 462 moving along the driving guide groove; the transducer pass through third L shape connecting plate 463 with the drive slip table is connected, the upper portion cover of third L shape connecting plate is established the stagnation point department of transducer (amplitude is zero department promptly), the lower part with the drive slip table is connected for just can drive ultrasonic system when drive system's drive slip table is gliding forward. The quantitative device and the driving system are arranged at the position of a stagnation point (the ultrasonic vibration amplitude is 0) of the ultrasonic vibration system, so that the quantitative device and the driving system can work stably without being influenced by the ultrasonic vibration.

In fig. 5, the dosing device is arranged in the second base, and the channel and the tool head are arranged in the horizontal channel of the first base, so that for the sake of clearly showing the connection and structure of the dosing device, the tool head and the channel, the first base and the second base are vertically cut, i.e. the outer side structures of the first base and the second base are removed, and the dosing device, the tool head and the channel are exposed.

In fig. 6, the print head base, the first base, and the second base are vertically cut to show the internal structure.

The printing process of the 3D printing device in the embodiment is as follows:

early preparation: determining printing parameters according to the size, complexity and the like of the three-dimensional model, then selecting the diameter of a proper printing nozzle according to the printing parameters, determining the volume of the required material according to the flow of a printing nozzle opening, and rotating a connecting rod of the quantifying device to enable a right plate of the quantifying device to move left and right to achieve the determined volume.

Resetting: and resetting the printing platform, wherein the printing platform is positioned at the highest point in the Z direction, and the center of the printing platform is over against the printing nozzle of the printing head unit.

Feeding: granular plastic granules (the material is PLA) are poured into a material inlet of the charging barrel from the top of the 3D printing device.

Quantification: the quantitative device takes a certain volume of the material A into the quantitative chamber, the driving system works, the driving sliding table of the driving system slowly slides forwards, meanwhile, the quantitative device slides forwards in the same amplitude, after the quantitative device slides for a certain distance, the quantitative chamber reaches the upper part of the channel, and the material A falls into the channel (because the bottom end of the channel is blocked by the tool head which simultaneously moves in place, a certain amount of the material A is accumulated at the bottom of the channel).

Melting: the ultrasonic system and the quantitative device continue to move forwards, the tool head stops at an inlet close to the spring needle valve type nozzle, then the motor of the driving system rapidly rotates in the reverse direction, so that the ultrasonic system and the quantitative device move linearly in the reverse direction, and when the tool head of the ultrasonic system moves to the rear of the channel, all materials A originally accumulated in the channel enter a horizontal channel where the tool head is located; the ultrasonic system and the dosing device continue to move linearly in opposite directions until the dosing chamber moves below the outlet of the cartridge.

Then the same amount of material B is measured by a quantitative device. Then the ultrasonic system and the quantitative device start to move forwards repeatedly slowly, after sliding for a certain distance, the quantitative chamber reaches the upper part of the channel, and the material B is accumulated at the bottom of the channel. The tool head pushes the material A to move forwards continuously, so that the material A is compacted. The material A is rapidly melted under the combined action of ultrasonic vibration and tool head pressure. During melting, the tool head continues to advance, the pressure in the horizontal channel where the tool head is located continuously rises, and when the pressure reaches the opening pressure of the spring needle valve type nozzle, materials enter the bottom of the printing head unit through the channel in the spring needle valve type nozzle. The heating coil is arranged outside the printing head unit for heat transfer, so that the material is kept at the temperature.

Printing: the asynchronous motor drives the eccentric crank to rotate through a primary gear speed increasing mechanism (a large gear and a small gear). The rotation of the eccentric crank drives the piston to move up and down in the hole of the printing head base. When the piston moves downwards, the tip of the piston exerts a force on the molten material a of the print head unit so that the material is finally injected onto the printing platform in the form of one molten material ball.

3D print platform removes: and (3) moving the modules simultaneously according to the printing sequence XY to enable the current printing point to be just right below the printing nozzle, and after the layer A of the three-dimensional model is printed, the Z-direction linear module works to drive the printing platform to move downwards to prepare for printing the next layer B.

In the embodiment, the working period of the printing head unit is 1s, namely the printing head unit prints one molten material ball to the printing platform every second; the work cycle of the material melting unit is 1min (including the process and the return), namely the material melting unit conveys materials into the printing head unit once per minute, the volume of the materials is just equal to the discharge volume of the printing nozzle in one minute, namely the material volume metered by the metering device is the discharge volume of the printing nozzle per minute.

Therefore, the whole device can work continuously, and the printing nozzles of the printing head unit can discharge materials continuously.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. The ultrasonic plasticizing fused deposition modeling 3D printing device is characterized by comprising a support (1), a printing unit (2), a printing head unit (3) and a material melting unit (4);

the support comprises a first working platform (11) and a second working platform (12) which are arranged up and down, the first working platform is provided with the printing head unit and the material melting unit, and the second working platform is provided with the printing unit;

the material melting unit comprises an ultrasonic system (41), a quantitative device (45) and a driving system (46), wherein the quantitative device comprises a connecting rod (451), a left plate (452) and a right plate (453);

one end of the connecting rod is arranged in a cavity (441) of the second base (44), and the other end of the connecting rod extends out of the cavity and is connected with the ultrasonic system through a first connecting plate (414), so that the quantitative device and the ultrasonic system can move synchronously;

the left plate is arranged in the cavity and is fixed with one end of the connecting rod arranged in the cavity; the right plate is arranged in the cavity corresponding to the left plate, and a certain distance is arranged between the right plate and the left plate; the right plate is sleeved on the connecting rod and can move along the connecting rod, so that the distance between the right plate and the left plate is adjusted to control the amount of materials;

the ultrasonic system is used for melting materials; the driving system is used for driving the ultrasonic system to move back and forth, so that the ultrasonic system melts the material measured by the quantitative device; the printing head unit is used for transferring the molten material to the printing unit for printing.

2. An ultrasonic plasticized fused deposition modeling 3D printing apparatus as in claim 1, wherein the ultrasonic system comprises a tool head (411), a horn (412) and a transducer (413) connected in sequence, a first end of the tool head extending into a second end of a horizontal channel (431) disposed in the first base (43), a second end of the tool head being connected to the transducer (413) through the horn (412); the first base is fixed on the first working platform and arranged below the second base; the horizontal channel is matched with the tool head in size, so that the tool head can move back and forth in the horizontal channel; the outer side of the first end of the horizontal channel is connected with a connecting channel, and the connecting channel is communicated with the printing head unit, so that materials melted by an ultrasonic system can enter the printing head unit through the connecting channel.

3. An ultrasonic plasticized fused deposition modeling 3D printing device according to claim 2, wherein the connecting channel employs a spring needle valve type nozzle (47) with its opening facing the printhead unit.

4. An ultrasonic plasticized fused deposition modeling 3D printing apparatus as in claim 2, wherein an upper surface of the second base is provided with a barrel (42), an outlet of the barrel opening into the cavity; a channel (432) is arranged below the cavity, and two ends of the channel are respectively connected with the cavity and the horizontal channel; the channel (432) is disposed proximate a first end of the horizontal channel (431).

5. The ultrasonic plasticizing fused deposition modeling (3D) printing device according to claim 2, wherein the driving system is a ball screw transmission, and the driving system comprises a driving guide groove (461) arranged on the first working platform and a driving sliding table (462) moving along the driving guide groove; the transducer pass through third L shape connecting plate (463) with the drive slip table is connected, the riser cover of third L shape connecting plate is established the stagnation point department of transducer, its diaphragm with the drive slip table is connected for actuating system's drive slip table just can drive ultrasonic system when sliding forward and advance.

6. The ultrasonic plasticizing fused deposition modeling 3D printing device according to claim 2, wherein the print head unit comprises a speed increasing mechanism and a crank link mechanism, the speed increasing mechanism is used for providing power for the motion of the crank link mechanism;

the speed increasing mechanism comprises a motor (32), a coupler (33), a large gear (34) and a small gear (35), and the motor is arranged on a motor base (36); two ends of the coupler are respectively connected with the motor and the big gear, the big gear is meshed with the small gear, the motor drives the coupler to rotate, and further drives the big gear to rotate, so that the small gear is driven to rotate;

the crank-connecting rod mechanism comprises two eccentric cranks (37), a connecting rod (38) and a piston (39), the two eccentric cranks are mutually connected through a connecting piece and are respectively fixed on the inner side wall of the printing head base (31), one of the eccentric cranks is connected with the pinion, and the rotation of the pinion drives the two eccentric cranks to rotate; the connecting rod is arranged on a connecting piece between the two eccentric cranks and can move up and down along with the rotation of the eccentric cranks; the top end of the piston is connected with the lower end of the connecting rod, the lower end of the piston is in a conical tip shape, and the piston can move up and down in a pore channel of the printing head base along with the connecting rod, so that the piston can extrude molten materials in the piston; the side wall of the piston is also provided with a short pipe (391), and the short pipe is communicated with the connecting channel and the piston.

7. An ultrasonic plasticizing fused deposition modeling (3D) printing device according to claim 6, wherein a printing nozzle (311) is further disposed below the printing head base, and the printing nozzle is detachably connected with the printing head base to facilitate replacement of the printing nozzle; the lower end of the piston opens into the print nozzle.

8. An ultrasonic plasticized fused deposition modeling 3D printing apparatus as in claim 6, wherein the lower portion of the print head base is further provided with a heating coil (30) on the outside, and the heating coil is used for maintaining the temperature of the material and preventing the material from deteriorating.

9. The ultrasonic plasticizing fused deposition modeling (3D) printing device according to claim 1, wherein the printing unit comprises a printing platform (21), an X-direction module (22), a Y-direction module (23) and a Z-direction module (24), the X-direction module, the Y-direction module and the Z-direction module are all driven by ball screws, and the printing unit comprises at least one group of X-direction modules;

the X-direction module comprises an X-direction guide groove (221) and an X-direction sliding table (222) moving along the X-direction guide groove, and the X-direction guide groove is arranged on the second working platform; a sliding groove (26) is arranged on the second working platform in parallel with the X-direction sliding groove, a first roller (27) moving along the sliding groove is arranged in the sliding groove, and the upper surface of the first roller and the upper surface of the X-direction sliding table are positioned on the same horizontal plane;

the Y-direction module comprises a Y-direction guide groove (231) and a Y-direction sliding table moving along the Y-direction guide groove; the X-direction module and the Y-direction module are connected by a first L-shaped connecting plate (25) which is vertically arranged, one end of a transverse plate of the first L-shaped connecting plate is arranged on the upper surface of the X-direction sliding table, the other end of the transverse plate of the first L-shaped connecting plate is arranged on the upper surface of the first roller, and the Y-direction guide groove is arranged on a vertical plate of the first L-shaped connecting plate;

the Z-direction modules comprise Z-direction guide grooves (241) and Z-direction sliding tables moving along the Z-direction guide grooves, and the back surfaces of the Z-direction guide grooves are directly or indirectly connected with the Y-direction sliding tables;

the printing platform is connected with the Z-direction sliding table through a second L-shaped connecting plate, and the second L-shaped connecting plate is arranged below the printing platform.

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