CN112030242A - Piezoelectric driving type direct-writing electrostatic spinning system - Google Patents
Piezoelectric driving type direct-writing electrostatic spinning system Download PDFInfo
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- CN112030242A CN112030242A CN202010871949.4A CN202010871949A CN112030242A CN 112030242 A CN112030242 A CN 112030242A CN 202010871949 A CN202010871949 A CN 202010871949A CN 112030242 A CN112030242 A CN 112030242A
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
Abstract
The invention discloses a piezoelectric driving type direct-writing electrostatic spinning system which comprises an electrostatic spinning direct-writing needle assembly, a collecting plate and a driving device, wherein the electrostatic spinning direct-writing needle assembly is positioned above the collecting plate, and the distance between the electrostatic spinning direct-writing needle assembly and the collecting plate is not more than 5 mm; the driving device comprises a piezoelectric ceramic actuator and a driving controller, the driving controller is used for enabling the piezoelectric ceramic actuator to generate displacement and adjusting and controlling the displacement, and the piezoelectric ceramic actuator is used for driving the electrostatic spinning direct writing needle assembly or the collecting plate to generate micro motion. The piezoelectric ceramic actuator is applied to the electrostatic spinning near-field direct writing device, and the linear/reciprocating motion is carried out by micro-scale or even nano-scale fine adjustment of the driving controller in a specific direction, so that the wavy/serpentine micro-nano structure can be manufactured; the displacement precision of this patent is very high, and the general error control is at tens nanometers or even several nanometers.
Description
Technical Field
The invention relates to the technical field of electrostatic spinning equipment, in particular to a direct-writing electrostatic spinning system.
Background
Research on micro-nano structures has become a key field for scientific exploration of various countries. The micro-nano structure has good characteristics of electricity, chemistry, magnetism, optics, biocompatibility and the like, has great application potential and commercial value in multiple fields of machinery, electronics, materials, chemistry, physics, biology and the like, has breakthrough progress in a specific research direction, and particularly provides higher requirements of rapidness, integration, low cost, accuracy, controllability and the like for the preparation of the micro-nano structure along with the rapid development and industrial application of micro-nano integrated devices and systems.
The term "electrospinning" is derived from "electrospinning" or earlier "electrospinning", and is generally abbreviated as "electrospinning" or "electrospinning" in China. In 1934, Formalas invented experimental apparatus for preparing polymer fibers using electrostatic force and applied for a patent which issued how polymer solution forms jet flow between electrodes, which is the first patent describing in detail the apparatus for preparing fibers using high voltage static electricity, and is recognized as the beginning of the electrostatic spinning technology for preparing fibers. Electrospinning is a special nanofiber manufacturing process, where polymer solutions or melts are jet spun in a strong electric field. Under the action of the electric field, the liquid drop at the needle head changes from a spherical shape to a conical shape (i.e. a Taylor cone) and extends from the tip of the cone to obtain a fiber filament. This way, polymer fibers with micrometer or even nanometer-scale diameters can be produced. The preparation of nanofibrous materials through electrostatic spinning technology is one of the most important academic and technical activities in the field of materials science and technology in the world in recent decades. The traditional electrostatic spinning is generally carried out under the condition that a collecting device is more than 10mm, namely far-field spinning, ordered and controllable fibers are difficult to prepare, and application development is limited to a certain extent. The researchers found that when the jet flow flies out from the nozzle in the electrostatic spinning jet process, the jet flow is divided into two stages: the initial linear motion phase and the unstable spiral motion phase of the jet. Based on the method, the electrostatic spinning near-field direct writing technology utilizes the initial linear motion stage of jet flow to directly write ordered controllable fibers on a motion platform in a near field by shortening the collection distance, generally from dozens of micrometers to several millimeters.
The electrostatic spinning near-field direct writing technology has become one of the main approaches for effectively preparing nanofiber materials due to the advantages of simple manufacturing device, low spinning cost, various spinnable substances, controllable process and the like. Electrospinning technology has produced a wide variety of nanofibers including organic, organic/inorganic composite, and inorganic nanofibers. The nano-fiber has potential application in the fields of high-temperature filtration, high-efficiency catalysis, biological tissue engineering, photoelectric devices, aerospace devices and the like. On the basis of the technology, the diversification of the components and the fine control of the structure of the electrostatic spinning nanofiber become the key points of the further development of the technology in the future.
The prior art mainly comprises an electrostatic spinning near-field direct writing technology in a single-needle mode and an electrostatic spinning near-field direct writing technology in a multi-needle mode. The electrostatic spinning near-field direct writing technology of the single-needle mode is currently difficult to manufacture precise wavy/serpentine micro-nano structures, one method is to manufacture the wavy/serpentine micro-nano structures by utilizing the unstable stage of jet flow, the shapes of the wavy/serpentine micro-nano structures are not controllable, and the other method is to manufacture the wavy/serpentine micro-nano structures by utilizing the relative motion of a needle and a collection platform. For example, the patent document with publication number CN108977960A is disclosed by the national intellectual property office in 2018, 12 and 11, and a preparation method of the PVDF high-tensile piezoelectric microfiber with a double-stage wave structure comprises the following steps: 1) and preparing a PVDF electrostatic spinning solution. 1g of PVDF powder is weighed and put into a 25mL sample bottle with stirring magneton, then 2.5g of DMF and 2.5g of acetone are respectively added, and the bottle cap is quickly closed to prevent the acetone from volatilizing. And (3) placing the sample bottle on a magnetic stirrer for stirring, setting the heating temperature to be 35 ℃, and stirring for 4-6 hours until a uniform and transparent PVDF electrostatic spinning solution is obtained. The spinning solution was allowed to stand for half an hour to remove air bubbles for use. 2) And preparing the in-plane wavy PVDF piezoelectric microfiber. Sucking the settled PVDF solution by using a 1mL syringe, connecting the positive pole of a high-voltage direct current power supply to a syringe needle, connecting the negative pole of the high-voltage direct current power supply to a metal collecting plate, and fixing the metal collecting plate on a two-dimensional displacement table. And (3) adjusting the distance between the syringe needle and the metal collecting plate to be 7mm, setting the flow of the injection pump to be 400nL/min, and adjusting the voltage of a high-voltage power supply to be 2.72kV to obtain the PVDF direct jet which is vertically sprayed to the collecting plate. Starting two-dimensional displacement table control software, setting the moving coordinate and speed of the displacement table to enable the displacement table to move in a wave-shaped motion mode, wherein the set parameters are as follows: the X-axis speed is 86mm/s, the Y-axis speed is 50mm/s, the wavelength of the corresponding wave-shaped structure is 1mm, the amplitude is 0.43mm, the ambient temperature is 24 ℃, and the relative humidity is 42%. While keeping the electrostatic spinning direct jet flow, repeating the wave motion mode of the two-dimensional displacement table, wherein the spacing between the repeated fibers is 0.4mm, and finally preparing the in-plane wave PVDF piezoelectric microfibers arranged in an array. 3) And (3) preparing the PVDF piezoelectric microfiber with a double-stage wave structure. Pre-stretching a VHB elastic film matrix with certain viscosity to 200% strain by using a stretching platform, contacting and attaching a metal collecting plate prepared with the in-plane wavy PVDF piezoelectric microfibers with the VHB film, and then removing the metal collecting plate, thereby completing the transfer process of the PVDF microfibers from the collecting plate to the elastic matrix. After the PVDF fiber is transferred to the VHB elastic matrix, the pretensioning stress is gradually released, so that the elastic matrix recovers the original length, an out-of-plane pop-up type wavy structure is obtained, and a double-wave structure is formed.
The accuracy of the wavy/serpentine micro-nano structure is difficult to reach several micrometers, even hundreds of nanometers or dozens of nanometers unless a complex high-accuracy high-speed positioning platform is loaded.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide a piezoelectric driving type direct-writing electrostatic spinning system with high displacement precision. The system applies the piezoelectric ceramic actuator to the electrostatic spinning near-field direct writing device, and the linear/reciprocating motion is carried out by micro-scale or even nano-scale fine adjustment of the driving controller in a specific direction, so that the wavy/serpentine micro-nano structure can be manufactured.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a piezoelectric driving type direct-writing electrostatic spinning system comprises an electrostatic spinning high-voltage power supply, an electrostatic spinning direct-writing needle assembly, a collecting plate and a driving device, wherein the electrostatic spinning high-voltage power supply is used for enabling a high-voltage electrostatic field to be formed between the electrostatic spinning direct-writing needle assembly and the collecting plate, the electrostatic spinning direct-writing needle assembly is located above the collecting plate, and the distance between the lower end of an infusion needle in the electrostatic spinning direct-writing needle assembly and the collecting plate is not more than 5 mm; the driving device comprises a piezoelectric ceramic actuator and a driving controller, the driving controller is used for enabling the piezoelectric ceramic actuator to generate displacement and adjusting and controlling the displacement, and the piezoelectric ceramic actuator is used for driving the electrostatic spinning direct writing needle assembly or the collecting plate to generate micro motion.
Furthermore, the driving device also comprises a substrate, a flexible transmission mechanism, a fixed insulating plate, a pressing steel ball and a jacking screw, the electrostatic spinning direct writing needle assembly is fixed on the fixed insulating plate, the fixed insulating plate is fixedly connected with the flexible transmission mechanism, the flexible transmission mechanism is arranged on the left side of the substrate, a fixed block is arranged on the right side of the substrate, a ball groove is formed on the left side wall of the fixed block, a threaded hole communicated with the ball groove is formed on the right side wall of the fixed block, the pressing steel ball is positioned in the ball groove, the jacking screw is arranged in the threaded hole, the piezoelectric ceramic actuator is placed on the substrate, one end of the jacking screw jacks the right end of the piezoelectric ceramic actuator through the pressing steel ball, the left end of the piezoelectric ceramic actuator is jacked on the flexible transmission mechanism, and the piezoelectric ceramic actuator drives the flexible transmission mechanism, the flexible transmission mechanism drives the fixed insulating plate, and the fixed insulating plate is provided with the dynamic and static electrospinning direct writing needle assembly to generate micromotion.
Furthermore, the flexible transmission mechanism is a rectangular plate, two square holes are formed in the surface of the rectangular plate, a bearing stress plate strip is arranged in a region, between the two square holes, on the rectangular plate and is positioned in the center of the rectangular plate, two inner left arc-shaped grooves are formed in the left side edge in the square holes, and two outer left arc-shaped grooves corresponding to the inner left arc-shaped grooves are formed in the left side edge of the rectangular plate; two inner right arc-shaped grooves are formed in the right side edge in the square hole, and two outer right arc-shaped grooves corresponding to the inner right arc-shaped grooves are formed in the right side edge of the rectangular plate. Due to the adoption of the structure, the novel elastic reset device not only has certain bearing capacity, but also has great elasticity, can effectively reset, and has long service life.
Furthermore, the upper end and the lower end of the flexible transmission mechanism are respectively fixed on the substrate through screws, and the left end of the piezoelectric ceramic actuator is pressed against a bearing stressed plate strip of the flexible transmission mechanism; the top pressing surface of the left end surface of the piezoelectric ceramic actuator is an arc surface. The design is fixed, and the flexible transmission mechanism can be ensured to be fully contacted with the piezoelectric ceramic actuator.
Furthermore, the driving device also comprises a shielding cover which is fixed on the substrate through screws and covers the piezoelectric ceramic actuator. The piezoelectric ceramic actuator is covered by the shielding cover, so that the piezoelectric ceramic actuator can work safely and reliably and is prevented from being interfered by an external electric field.
Further, the piezoelectric driving type direct-writing electrostatic spinning system further comprises an XY axis moving platform and a lifting device, the collecting plate is installed on the XY axis moving platform, the driving device is installed on the lifting device, the positive electrode of the electrostatic spinning high-voltage power supply is electrically connected with the collecting plate, and the negative electrode of the electrostatic spinning high-voltage power supply is electrically connected with the infusion needle of the electrostatic spinning direct-writing needle assembly.
Furthermore, the lifting device comprises a driving motor, a slide rail, a screw rod, a slide block, an L-shaped metal induction strip, an upper travel induction switch and a lower travel induction switch, wherein the screw rod is installed on the slide rail, a threaded through hole is formed in the slide block, the screw rod is inserted into the threaded through hole of the slide block and is in threaded connection with the threaded through hole, the L-shaped metal induction strip is fixed on one side of the slide block, a substrate of the driving device is fixed on the slide block, when the lifting device works, the driving motor drives the screw rod to rotate, the screw rod drives the slide block, the slide block moves downwards along the slide rail, and when the lower travel induction switch induces the L-shaped metal induction strip, the lower travel induction switch closes; when the device does not work, the driving motor drives the lead screw to rotate reversely, the lead screw drives the sliding block, the sliding block moves upwards along the sliding rail, and when the upper stroke induction switch induces the L-shaped metal induction strip, the upper stroke induction switch closes the driving motor.
Furthermore, the electrostatic spinning direct writing needle assembly comprises a material barrel and an infusion needle, one end of the infusion needle is inserted into the bottom of the material barrel, and liquid raw materials are stored in the material barrel.
Furthermore, the electrostatic spinning direct writing needle assembly comprises a material barrel, an infusion needle and an electric heater, wherein one end of the infusion needle is inserted into the bottom of the material barrel, the electric heater is used for melting raw materials in the material barrel, and granular raw materials or powdery raw materials are stored in the material barrel.
Furthermore, the side of the flexible transmission mechanism and the position corresponding to the bearing stressed plate strip are connected with one end of the connecting part, the other end of the connecting part is connected with the fixing plate, the flexible transmission mechanism, the connecting part and the fixing plate are integrally formed, mounting through holes are distributed in the fixing plate, screws are inserted in the mounting through holes, and the fixing insulating plate is fixed on the fixing plate.
The invention has the beneficial effects that:
because the piezoelectric ceramic actuator is applied to the electrostatic spinning near-field direct writing device, the linear/reciprocating motion is carried out by micro-scale or even nano-scale fine adjustment of the driving controller in a specific direction, and the wavy/serpentine micro-nano structure can be manufactured by matching with the relative motion of the XY-axis moving platform. The displacement precision of the device is very high, and the general error is controlled to be dozens of nanometers or even dozens of nanometers;
the piezoelectric ceramic actuator is covered by the shielding cover, so that the piezoelectric ceramic actuator can work safely and reliably and is prevented from being interfered by an external electric field;
the flexible transmission mechanism is designed into the structural form and is a rectangular plate, so that the flexible transmission mechanism not only has certain bearing capacity, but also has great elasticity, can effectively reset and has long service life;
because the electrostatic spinning direct writing needle assembly and the collecting plate are arranged on the respective driving devices, the wavy/serpentine micro-nano structure can be directly manufactured, and the secondary corrugated curve structure can be directly written by electrostatic spinning when the driving device of the XY-axis moving platform and the driving device on the lifting device work.
Drawings
The invention is further described with the aid of the accompanying drawings, in which the embodiments do not constitute any limitation, and for a person skilled in the art, without inventive effort, further drawings may be obtained from the following figures:
FIG. 1 is a schematic structural view of example 1 of the present invention;
FIG. 2 is a schematic structural diagram of the driving device shown in FIG. 1;
FIG. 3 is a perspective view of FIG. 2 with the drive controller omitted;
FIG. 4 is a schematic structural view of the flexible transmission mechanism shown in FIG. 2;
FIG. 5 is a schematic view of the flexible transmission mechanism of FIG. 4 with a fixed plate;
FIG. 6 is a schematic structural view of the electrospinning direct writing needle assembly shown in FIG. 1;
FIG. 7 is a schematic structural view of the lifting device shown in FIG. 1;
FIG. 8 is a schematic structural view of example 2 of the present invention;
FIG. 9 is a graph of the second order waviness of the traces formed by the electrospinning direct writing of example 2 of the present invention;
FIG. 10 is a diagram of a near-field direct-write wavy structure for electrospinning according to the present invention;
FIG. 11 is a serpentine micro-nano structure diagram of electrostatic spinning near-field direct writing.
In the figure: 1. an electrostatic spinning direct write needle assembly; 2. a collection plate; 3. a drive device; 4. an electrostatic spinning high-voltage power supply; 5. An XY axis moving platform; 6. a lifting device; 7. a substrate; 8. a flexible transmission mechanism; 9. fixing an insulating plate; 10. pressing the steel ball; 11. jacking the screw tightly; 12. a fixed block; 13. a ball groove; 14. a threaded hole; 15. a piezoelectric ceramic actuator; 16. a shield case; 17. a screw; 18. a square hole; 19. load bearing slats; 20. an inner left arc-shaped slot; 21. an outer left arc-shaped slot; 22. an inner right arc-shaped slot; 23. an outer right arc-shaped slot; 24. a screw; 25. a screw; 26. a charging barrel; 27. an infusion needle; 28. an electric heater; 29. a drive motor; 30. a slide rail; 31. a lead screw; 32. a slider; 33. an L-shaped metal induction bar; 34. an upper travel sensing switch; 35. a lower travel induction switch; 37. a drive controller; 38. a screw; 39. a connecting portion; 40. a fixing plate; 41. and installing the through hole.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and specific embodiments, and it is to be noted that the embodiments and features of the embodiments of the present application can be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper surface", "lower surface", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "forward", "reverse", "axial", "radial", "circumferential", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Example 1
As shown in fig. 1, a piezoelectric driving type direct writing electrostatic spinning system comprises an electrostatic spinning direct writing needle assembly 1, a collecting plate 2, a driving device 3, an electrostatic spinning high-voltage power supply 4, an XY axis moving platform 5 and a lifting device 6, wherein the collecting plate 2 is installed on the XY axis moving platform 5, the driving device 3 is installed on the lifting device 6, the electrostatic spinning direct writing needle assembly 1 is located above the collecting plate 2, and the distance between the lower end of a transfusion needle in the electrostatic spinning direct writing needle assembly 1 and the collecting plate is not more than 5 mm; the positive pole in the electrostatic spinning high-voltage power supply 4 is electrically connected with the collecting plate 2, and the negative pole in the electrostatic spinning high-voltage power supply 4 is electrically connected with the transfusion needle in the electrostatic spinning direct writing needle assembly. When the jet flow flies out from the pinhole in the electrostatic spinning jet process, the electrostatic spinning direct writing needle assembly 1 is divided into two stages: the initial linear motion stage and the unstable spiral motion stage of efflux, the interval between the transfusion needle lower extreme and the collecting plate in the electrostatic spinning direct writing needle subassembly 1 of this patent is not more than 5mm, utilizes the initial linear motion stage of efflux, and the orderly controllable fibre is directly written out to the near field on the motion platform.
Since the piezoelectric ceramic actuator is applied to the electrostatic spinning near-field direct writing device, the drive controller performs micron-scale or even nano-scale fine adjustment in a specific direction to perform linear/reciprocating motion, and the manufacturing of the wavy structure can be realized by matching with the relative motion of the XY-axis moving platform, as shown in FIG. 10. Or a serpentine-like micro-nano structure is realized as shown in fig. 11.
As shown in fig. 2 and 3, the driving device 3 further includes a substrate 7, a flexible transmission mechanism 8, a fixed insulating plate 9, a pressing steel ball 10, a tightening screw 11, a piezoelectric ceramic actuator 15 and a driving controller 37, the electrostatic spinning direct writing needle assembly 1 is fixed on the fixed insulating plate 9, the fixed insulating plate 9 is fixedly connected with the flexible transmission mechanism 8, the flexible transmission mechanism 8 is arranged on the left side of the substrate 7, the right side of the substrate 7 is provided with a fixed block 12, the fixed block 12 is fixed on the substrate 7 through a screw 38, the left side wall of the fixed block 12 is provided with a ball groove 13, the right side wall of the fixed block 12 is provided with a threaded hole 14 communicated with the ball groove 13, the pressing steel ball 10 is located in the ball groove 13, the tightening screw 11 is arranged in the threaded hole 14, the piezoelectric ceramic actuator 15 is arranged on the substrate 7, one end of the tightening screw 11 tightly presses the right end of the piezoelectric ceramic actuator 15 through the pressing steel ball 10, the left end of the piezoelectric ceramic actuator 15 is pressed against the flexible transmission mechanism 8, the piezoelectric ceramic actuator 15 drives the flexible transmission mechanism 8, the flexible transmission mechanism 8 drives the fixed insulation board 9, and the fixed insulation board 9 drives the electrostatic spinning direct writing needle assembly 1 to generate micro motion. The driving controller 37 is configured to displace the piezoelectric ceramic actuator 15 and adjust and control the displacement, and the piezoelectric ceramic actuator can realize axial displacement, where the displacement stroke is generally tens of micrometers to several millimeters, the displacement precision is generally tens of nanometers or even several nanometers, the vibration frequency output by the driving controller 37 is generally thousands of hertz, and of course, the vibration frequency can be adjusted to 1 hertz at minimum and thousands of hertz at maximum, and is specifically adjusted according to actual needs. The piezoelectric ceramic actuator can be controlled in a closed loop or an open loop mode.
The drive device 3 further comprises a shield 16, the shield 16 being fastened to the base plate 7 by screws 17 and covering the piezoceramic actuator 15. The shield case 16 covers the piezoelectric ceramic actuator 15, and the piezoelectric ceramic actuator 15 can be operated safely and reliably to avoid interference from an external electric field. The housing of the shield 16 provides "shielding" of the piezo-ceramic actuator 15 inside from external electric fields, a phenomenon known as electrostatic shielding. The specific principle is as follows: the electric field at a certain position in the hollow zone in the metal conductor is zero: according to the principle of field intensity superposition, the electric field intensity in the conductor is equal to the superposition of E' generated by self charge and an external electric field E, and the electric fields with equal size and opposite directions are superposed and mutually offset, so that the total electric field intensity in the conductor is zero. When the total electric field strength inside the conductor is zero, the free electrons inside the conductor no longer move. The state of no charge movement in a conductor is called electrostatic equilibrium in physics. A conductor in electrostatic equilibrium has an internal electric field strength of zero everywhere. It is inferred that the electric charge is distributed only on the outer surface of the conductor in the state of electrostatic equilibrium. If this conductor is hollow, there will also be no electric field inside when it reaches electrostatic equilibrium.
As shown in fig. 4, the flexible transmission mechanism 8 may be designed as an equal displacement deformation mechanism or a displacement amplification deformation mechanism, and in this embodiment, the equal displacement deformation mechanism is an equal displacement deformation mechanism, specifically, the flexible transmission mechanism 8 is a rectangular plate, two square holes 18 are formed in a plate surface of the rectangular plate, a bearing stressed lath 19 is arranged on the rectangular plate and in a region between the two square holes 18, the bearing stressed lath 19 is located at a central portion of the rectangular plate, two inner left arc-shaped grooves 20 are formed in a left side edge in the square holes 18, and two outer left arc-shaped grooves 21 corresponding to the inner left arc-shaped grooves 20 are formed in a left side edge of the rectangular plate; two inner right arc-shaped grooves 22 are formed in the right side edge of the square hole 18, and two outer right arc-shaped grooves 23 corresponding to the inner right arc-shaped grooves 22 are formed in the right side edge of the rectangular plate. Due to the adoption of the structure, the novel elastic reset device not only has certain bearing capacity, but also has great elasticity, can effectively reset, and has long service life. The upper end and the lower end of the flexible transmission mechanism 8 are respectively fixed on the substrate 7 through a screw 24 and a screw 25, and the left end of the piezoelectric ceramic actuator 15 is pressed against the bearing stress lath 19 of the flexible transmission mechanism 8; the top pressing surface of the left end surface of the piezoelectric ceramic actuator is an arc surface. The design is fixed, and the flexible transmission mechanism can be ensured to be fully contacted with the piezoelectric ceramic actuator.
As shown in fig. 5, the side of the flexible transmission mechanism 8 and the position corresponding to the bearing force-bearing lath 19 are connected to one end of the connecting portion 39, the other end of the connecting portion 39 is connected to the fixing plate 40, the flexible transmission mechanism 8, the connecting portion 39 and the fixing plate 40 are integrally formed, the fixing plate 40 is distributed with mounting through holes 41, and screws are inserted into the mounting through holes 41 to fix the fixed insulating plate 9 on the fixing plate 40.
As shown in fig. 6, the electrospinning direct writing needle assembly 1 includes a cylinder 26 and an infusion needle 27, one end of the infusion needle 27 is inserted into the bottom of the cylinder 26, and a liquid raw material is stored in the cylinder 26. When the granular raw material or the powdery raw material is stored in the material cylinder 26, an electric heater 28 needs to be additionally arranged in the material cylinder, the electric heater 28 adopts the structural form of an electric heating film, and the electric heating film is tightly attached to the side wall in the material cylinder 26. The electric heater 28 is used to melt the raw material. The electric heater 28 can heat several tens to several hundreds of degrees centigrade to convert the raw material from solid state to melt liquid state, so as to prepare for the near-field direct writing of the subsequent melt electrostatic spinning. For example: the melt electrospinning near-field direct writing temperature of the PCL (polycaprolactone) material is generally 110-125 ℃.
As shown in fig. 7, the lifting device 6 includes a driving motor 29, a slide rail 30, a lead screw 31, a slider 32, an L-shaped metal induction bar 33, an upper stroke induction switch 34 and a lower stroke induction switch 35, the lead screw 31 is mounted on the slide rail 30, the slider 32 is provided with a threaded through hole (not shown in the figure), the lead screw 31 is inserted into the threaded through hole of the slider and is in threaded connection with the threaded through hole, the L-shaped metal induction bar 33 is fixed on one side of the slider 32, the substrate 7 of the driving device 3 is fixed on the slider 32, when the lifting device operates, the driving motor 29 drives the lead screw 31 to rotate, the lead screw 31 drives the slider 32, the slider 32 moves downwards along the slide rail 30, and when the lower stroke induction switch 35 induces the L-shaped metal induction bar 33, the lower stroke induction switch 35 turns off the driving; when the device does not work, the driving motor 29 drives the lead screw to rotate reversely, the lead screw drives the sliding block, the sliding block 32 moves upwards along the sliding rail 30, and when the upper travel induction switch 34 induces the L-shaped metal induction strip 34, the upper travel induction switch 34 turns off the driving motor 29.
Example 2
As shown in fig. 8, the present embodiment is different from embodiment 1 in that: the drive device 3 of the patent technology is installed on the XY axis moving platform 5, the collecting plate 2 is installed on the fixed insulating plate 9 of the drive device 3, the piezoelectric ceramic actuator 15 in the drive device 3 drives the flexible transmission mechanism 8, the flexible transmission mechanism 8 drives the fixed insulating plate 9, and the fixed insulating plate 9 drives the collecting plate 2 to generate micro motion. In general, when the driving device 3 of the XY-axis moving stage 5 operates, the driving device 3 on the elevating device 6 does not operate;
when the driving device 3 of the XY-axis moving stage 5 and the driving device 3 of the lifting device 6 are both operated, the track formed by the electrospinning direct writing is a secondary ripple curve, as shown in fig. 9.
Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A piezoelectric driving type direct-writing electrostatic spinning system is characterized in that: the electrostatic spinning direct-writing needle assembly is positioned above the collecting plate, and the distance between the lower end of a transfusion needle in the electrostatic spinning direct-writing needle assembly and the collecting plate is not more than 5 mm; the driving device comprises a piezoelectric ceramic actuator and a driving controller, the driving controller is used for enabling the piezoelectric ceramic actuator to generate displacement and adjusting and controlling the displacement, and the piezoelectric ceramic actuator is used for driving the electrostatic spinning direct writing needle assembly or the collecting plate to generate micro motion.
2. The piezo-driven, direct-write electrospinning system of claim 1, wherein: the driving device also comprises a substrate, a flexible transmission mechanism, a fixed insulating plate, a pressing steel ball and a jacking screw, wherein the electrostatic spinning direct writing needle assembly is fixed on the fixed insulating plate, the fixed insulating plate is fixedly connected with the flexible transmission mechanism, the flexible transmission mechanism is arranged on the left side of the substrate, a fixed block is arranged on the right side of the substrate, a ball groove is formed in the left side wall of the fixed block, a threaded hole communicated with the ball groove is formed in the right side wall of the fixed block, the pressing steel ball is positioned in the ball groove, the jacking screw is arranged in the threaded hole, the piezoelectric ceramic actuator is placed on the substrate, one end of the jacking screw jacks the right end of the piezoelectric ceramic actuator through the pressing steel ball, the left end of the piezoelectric ceramic actuator is jacked on the flexible transmission mechanism, and the piezoelectric ceramic actuator drives the flexible transmission mechanism, the flexible transmission mechanism drives the fixed insulating plate, and the fixed insulating plate is provided with the dynamic and static electrospinning direct writing needle assembly to generate micromotion.
3. The piezo-driven direct-write electrospinning system of claim 2, wherein: the flexible transmission mechanism is a rectangular plate, two square holes are formed in the surface of the rectangular plate, a bearing stress plate strip is arranged in a region, between the two square holes, on the rectangular plate and is positioned in the center of the rectangular plate, two inner left arc-shaped grooves are formed in the left side edge in the square holes, and two outer left arc-shaped grooves corresponding to the inner left arc-shaped grooves are formed in the left side edge of the rectangular plate; two inner right arc-shaped grooves are formed in the right side edge in the square hole, and two outer right arc-shaped grooves corresponding to the inner right arc-shaped grooves are formed in the right side edge of the rectangular plate.
4. The piezo-driven direct-write electrospinning system of claim 3, wherein: the upper end and the lower end of the flexible transmission mechanism are respectively fixed on the substrate through screws, and the left end of the piezoelectric ceramic actuator is pressed against a bearing stressed plate strip of the flexible transmission mechanism; the top pressing surface of the left end surface of the piezoelectric ceramic actuator is an arc surface.
5. The piezo-driven direct-write electrospinning system of claim 4, wherein: the driving device also comprises a shielding cover which is fixed on the substrate through screws and covers the piezoelectric ceramic actuator.
6. The piezo-driven direct-write electrospinning system of any of claims 1 to 5, wherein: the electrostatic spinning direct writing needle assembly comprises a collecting plate, a driving device, an electrostatic spinning high-voltage power supply, a collecting plate, a lifting device, an X-Y axis moving platform and a lifting device, wherein the collecting plate is installed on the X-Y axis moving platform, the driving device is installed on the lifting device, a positive electrode in the electrostatic spinning high-voltage power supply is electrically connected with the collecting plate, and a negative electrode in the electrostatic spinning high-voltage power supply is electrically connected with a transfusion needle in the electrostatic spinning direct.
7. The piezo-driven direct-write electrospinning system of claim 6, wherein: the lifting device comprises a driving motor, a sliding rail, a lead screw, a sliding block, an L-shaped metal induction strip, an upper stroke induction switch and a lower stroke induction switch, wherein the lead screw is installed on the sliding rail, a threaded through hole is formed in the sliding block, the lead screw is inserted into the threaded through hole of the sliding block and is in threaded connection with the threaded through hole, the L-shaped metal induction strip is fixed on one side of the sliding block, a base plate of the driving device is fixed on the sliding block, when the lifting device works, the driving motor drives the lead screw to rotate, the lead screw drives the sliding block, the sliding block moves downwards along the sliding rail, and when the lower stroke induction switch induces the L-shaped metal induction strip, the lower stroke; when the device does not work, the driving motor drives the lead screw to rotate reversely, the lead screw drives the sliding block, the sliding block moves upwards along the sliding rail, and when the upper stroke induction switch induces the L-shaped metal induction strip, the upper stroke induction switch closes the driving motor.
8. The piezo-driven direct-write electrospinning system of claim 6, wherein: the electrostatic spinning direct writing needle assembly comprises a material barrel and an infusion needle, wherein one end of the infusion needle is inserted into the bottom of the material barrel, and liquid raw materials are stored in the material barrel.
9. The piezo-driven direct-write electrospinning system of claim 6, wherein: the electrostatic spinning direct writing needle assembly comprises a charging barrel, an infusion needle and an electric heater, wherein one end of the infusion needle is inserted into the bottom of the charging barrel, the electric heater is used for melting raw materials in the charging barrel, and granular raw materials or powdery raw materials are stored in the charging barrel.
10. The piezo-driven direct-write electrospinning system of claim 3, wherein: the side of the flexible transmission mechanism and the position corresponding to the bearing force bearing plate strip are connected with one end of the connecting part, the other end of the connecting part is connected with the fixed plate, the flexible transmission mechanism, the connecting part and the fixed plate are integrally formed, mounting through holes are distributed in the fixed plate, screws are inserted in the mounting through holes, and the fixed insulating plate is fixed on the fixed plate.
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