CN113500857B - Hybrid drive electronic jet printing device applied to insulating substrate and control method thereof - Google Patents
Hybrid drive electronic jet printing device applied to insulating substrate and control method thereof Download PDFInfo
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- CN113500857B CN113500857B CN202110664181.8A CN202110664181A CN113500857B CN 113500857 B CN113500857 B CN 113500857B CN 202110664181 A CN202110664181 A CN 202110664181A CN 113500857 B CN113500857 B CN 113500857B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/175—Ink supply systems ; Circuit parts therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
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Abstract
The invention discloses a hybrid drive electronic jet printing device applied to an insulating substrate and a control method thereof, wherein the hybrid drive electronic jet printing device comprises the following steps: the system comprises a main control mechanism, a piezoelectric actuating mechanism, a displacement amplifying mechanism, an electronic jet printing mechanism and an ink supply mechanism; the main control mechanism outputs a first low-voltage electric signal and a second low-voltage electric signal, the piezoelectric actuating mechanism generates excitation vibration displacement according to the amplified first low-voltage electric signal, the displacement amplification mechanism amplifies the micro longitudinal deformation displacement of the piezoelectric actuating mechanism into mechanical motion displacement of the first electrode needle, the ink supply mechanism adopts external constant-pressure control and ink through pipe conveying to realize continuous and stable supply of the electronic jet printing ink, and the electronic jet printing mechanism adopts electrode combination of the first electrode needle and the second electrode needle to realize electronic jet printing of an insulating substrate. The invention utilizes the mixed driving mode of piezoelectric actuation and electrostatic traction, can spray high-viscosity liquid drops far smaller than the size of the nozzle, realizes secondary printability under the condition that the spray head is kept still for a long time, and has higher stability for electric spray printing.
Description
Technical Field
The invention relates to the technical field of electrofluid jet printing, in particular to a hybrid drive electrospray printing device applied to an insulating substrate and a control method thereof.
Background
The traditional ink-jet printing technology adopts a piezoelectric type, a thermal foaming type and the like, but the ink-jet technology adopts an extrusion mode, so that the problems of difficult jetting of high-viscosity liquid, blockage of a nozzle, unstable jet flow and the like exist, and the printing resolution is severely limited by the size of the nozzle. Compared with the traditional jet printing technology, the electrohydrodynamic jet printing technology can jet print various materials such as high molecular organic matters and the like, and the applicable range of the ink is enlarged.
However, in the actual jet printing process, the electro-hydrodynamic jet printing technology still has the following problems:
(1) when high-viscosity ink is sprayed and printed by electrofluid, the ink is generally preheated, but the temperature rise can reduce the hydrodynamic viscosity, and the printed ink is easy to spread, so that the size of deposited liquid drops is increased, the height-to-width ratio is reduced, and the resolution is reduced;
(2) when high-viscosity liquid or volatile ink is printed, the nozzle can be blocked, and when the ink is placed for a long time after printing is finished, the residual ink in the nozzle can also cause the nozzle to be blocked in the next injection;
(3) the printing substrate is required to be made of a conductive material so as to form a strong electric field between the nozzle and the substrate to drive the ink after voltage is switched on, but when the insulating substrate is printed, the original electric field is distorted due to the interaction among the metal electrode needle, the charged liquid drop and the insulating substrate, so that jet flow deviates from an expected track;
(4) ink in the electric jet printing process is usually stored in a hollow spray needle, and when a large-range target is printed or printed for a long time, the spray needle needs to be repeatedly taken down for replenishing the ink, so that the working efficiency is greatly reduced by the working mode.
In the existing electric spraying printing method, the deposition quality of liquid drops is improved by adding a quick cooling device after ink liquid is sprayed, but the problem that high-viscosity ink blocks a nozzle is not solved; and a method of integrating an electrostatic lens into a printhead, but the printhead structure is too complicated, increasing manufacturing costs, and effectively solving the problems of head clogging and continuous supply of ink; the existing spray head capable of continuously supplying spray printing media cannot solve the problem of electronic spray printing of the insulating substrate.
Disclosure of Invention
In order to overcome the defects and shortcomings of the prior art, the invention provides a hybrid-driven electronic jet printing device applied to an insulating substrate and a control method thereof, solves the problems of non-printability of the insulating substrate, difficult ejection of high-viscosity liquid, nozzle blockage and non-continuous ink supply in electronic jet printing, can realize electronic jet printing and pattern design on substrates with different electrical properties, comprises a conductive substrate and the insulating substrate, can eject high-viscosity ink for a long time without blocking the nozzle, and can continuously and stably supply ink in the electronic jet printing process of a large-area target.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a hybrid drive electronic jet printing device applied to an insulating substrate, which comprises: the system comprises a main control mechanism, a piezoelectric actuating mechanism, a displacement amplifying mechanism, an electronic jet printing mechanism and an ink supply mechanism;
the main control mechanism is provided with a signal generating device, the signal generating device is used for outputting a first low-voltage electric signal and a second low-voltage electric signal, the first low-voltage electric signal is used for adjusting the pulse voltage of the piezoelectric actuating mechanism, and the second low-voltage electric signal is used for adjusting the high-voltage electric field of the electronic jet printing mechanism;
the piezoelectric actuating mechanism is provided with a low-voltage amplifier and a piezoelectric ceramic stack actuating device, wherein the input end of the low-voltage amplifier is connected with the signal generating device and used for amplifying a first low-voltage electric signal, and the piezoelectric ceramic stack actuating device is connected with the output end of the low-voltage amplifier and used for generating excitation vibration displacement according to the amplified first low-voltage electric signal;
the displacement amplification mechanism adopts a lever displacement amplification structure and is divided into a short end of a lever of the displacement amplification mechanism and a long end of the lever of the displacement amplification mechanism according to the position of a fulcrum of the lever, and the piezoelectric ceramic stack actuating device pushes the short end of the lever of the displacement amplification mechanism to move according to the excitation vibration displacement;
the electronic jet printing mechanism comprises a power amplification power supply, a nozzle, a first electrode needle and a second electrode needle, wherein the power amplification power supply is connected with a signal generating device and is used for amplifying a second low-voltage electric signal;
the needle point of the first electrode needle can extend out of the edge of the nozzle, the needle point of the first electrode needle and the needle point of the second electrode needle are positioned on the same vertical direction line, the direction line is vertical to the upper surface of the insulating substrate, the first electrode needle is connected with the long end of a lever of a displacement amplification mechanism, and the long end of the lever of the displacement amplification mechanism drives the first electrode needle to vertically move up and down along an ink jet flow channel;
the ink supply mechanism is used for supplying ink to the electronic jet printing mechanism, and the electronic jet printing mechanism forms jet flow or liquid drops based on the reciprocating motion of the first electrode needle and the action of an electric field and forms an electronic jet printing pattern on the insulating substrate.
As a preferred technical scheme, the displacement amplifying mechanism comprises a displacement amplifying lever, a fixed fulcrum and a needle fixing block, the displacement amplifying lever is connected with the fixed fulcrum, a connecting point is a lever fulcrum position, the displacement amplifying lever is divided into a short end and a long end according to the lever fulcrum position, the piezoelectric ceramic stack actuating device pushes the short end of the displacement amplifying lever to move according to excitation vibration displacement, so that the long end of the displacement amplifying lever is driven to move, the long end of the displacement amplifying lever is connected with the needle fixing block, and the long end of the displacement amplifying lever drives the needle fixing block to move up and down;
the first electrode needle is connected with the needle fixing block, and the needle fixing block drives the first electrode needle to vertically move up and down along the ink jet flow channel.
As preferred technical scheme, the displacement mechanism of amplifying still is equipped with lock post and reset spring, lock post bottom and insulating casing fixed connection, reset spring centers on the lock post outside, the displacement mechanism of amplifying lever stub and lock post top are equipped with flexible clearance, reset spring supports the displacement mechanism of amplifying lever stub for provide the displacement mechanism of amplifying initial position's elastic restoring force.
As a preferred technical scheme, the piezoelectric ceramic stack actuating device comprises an adjusting bolt, a fixing nut, a top cap plate, a piezoelectric ceramic stack, an inner electrode, an outer electrode, a bottom cap plate and a contact rod;
the inner electrode and the outer electrode wrap the piezoelectric ceramic stack and are connected with a first low-voltage electric signal, the adjusting bolt penetrates through the insulating shell to be connected with the top cap plate, the top cap plate and the bottom cap plate are respectively connected with the piezoelectric ceramic stack, the bottom cap plate is connected with the touch rod, the adjusting bolt is used for adjusting the height of an integral fixing structure formed by the piezoelectric ceramic stack, the top cap plate, the bottom cap plate and the touch rod, and the fixing nut is used for fixing the adjusting bolt;
the short end of the lever of the displacement amplification mechanism and the lower end of the contact rod form a movable contact, and the short end of the lever is driven to move up and down through the up-and-down vibration of the contact rod.
As a preferred technical scheme, the ink supply mechanism comprises a constant pressure output device and a syringe;
the constant voltage output device is used for keeping constant voltage, the constant voltage output device output is connected with the input of syringe, the input of syringe is equipped with the piston, the output of syringe is equipped with the conveyer pipe, the printing ink liquid is equipped with in the syringe, the printing ink liquid is pushed and shove to constant voltage output device drive piston, in the runner of delivering printing ink to the glass capillary through the conveyer pipe.
As a preferred technical scheme, the electronic jet printing mechanism is further provided with a glass capillary tube and a sealing ring, wherein the sealing ring is arranged at one end of the glass capillary tube and used for sealing the glass capillary tube;
the first electrode needle is vertically arranged in a flow channel of the glass capillary tube, and the nozzle is arranged at the tail end of the glass capillary tube.
As a preferred technical scheme, the main control mechanism is further provided with an upper computer, and the upper computer is in communication connection with the signal generating device.
The invention also provides a control method of the hybrid drive electronic jet printing device applied to the insulating substrate, which comprises the following steps:
the signal generating device outputs a first low-voltage electric signal and a second low-voltage electric signal, and the first low-voltage electric signal is boosted into a voltage excitation signal by a low-voltage amplifier and then acts on the piezoelectric ceramic stack actuating device;
the piezoelectric ceramic stack actuating device is excited by voltage to generate a longitudinal deformation displacement extension amount, pushes the short end of the displacement amplification lever, converts the short end displacement into long end displacement, and converts the long end displacement into the ascending movement amount of the first electrode needle through the needle fixing block;
changing the level polarity of the first low-voltage electric signal, recovering the deformation of the piezoelectric ceramic stack actuating device to an initial state, recovering the short end of the displacement amplification lever to an initial position, converting the short end displacement of the displacement amplification lever into the long end displacement of the displacement amplification lever, and converting the short end displacement into the downward feeding amount of the first electrode needle through the needle fixing block;
the first electrode needle moves downwards and extends out of the edge of the nozzle, and the first electrode needle drives the tip of the nozzle to form a conical liquid level;
and the second low-voltage electric signal is boosted by the power amplification power supply and then is transmitted to the first electrode needle and the second electrode needle, an electric field is formed between needle points of the first electrode needle and the second electrode needle, the conical liquid level is driven to deform into a Taylor cone to form jet flow or liquid drops, and an electronic jet printing pattern is formed on the insulating substrate.
As a preferred technical scheme, the first low-voltage electrical signal is driven by a periodic signal, and when the high level of the first low-voltage electrical signal changes to the low level, the change of the second low-voltage electrical signal is synchronous with the change of the first voltage electrical signal, and the first low-voltage electrical signal and the second low-voltage electrical signal are removed at the same time, so that a periodic electrical dot-spraying process is completed.
As a preferable technical scheme, when the first electrode needle moves downwards and extends out of the edge of the nozzle, the first low-voltage electric signal and the second low-voltage electric signal are driven by constant level polarity, so that continuous downward stretching of liquid injection is realized, and line printing is completed.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the whole set of the electric jet printing device has simple structure and higher stability for electric jet printing, can jet high-viscosity liquid drops far smaller than the size of a nozzle by utilizing a mixed driving mode of piezoelectric actuation and electrostatic traction, and realizes secondary printability under the condition that the nozzle is kept still for a long time.
(2) The piezoelectric actuating mechanism of the invention adopts the inverse piezoelectric effect of the piezoelectric ceramic stack, can realize the high-frequency driving of pulse signals, further realize the controllable frequency of liquid drop spraying, and solve the defect of low frequency of electrofluid spraying.
(3) The piezoelectric actuating mechanism adopts the adjusting bolt to regulate and control the size of the telescopic gap between the lever and the locking upright column, realizes the reset of the initial stress of the reset spring, can obtain larger restoring force by increasing the initial stress of the spring when spraying and printing high-viscosity liquid, and can enable the first electrode needle to overcome the resistance brought by the viscosity of the liquid in the glass capillary tube so as to realize the up-and-down movement.
(4) The displacement amplification mechanism adopts the lever amplification principle, can amplify the micro longitudinal deformation displacement of the piezoelectric ceramic stack into the mechanical movement displacement of the first electrode needle, and the reciprocating movement of the electrode needle can effectively solve the problem that the liquid in the flow channel blocks the spray head.
(5) The electrojet printing mechanism adopts the electrode combination of the first electrode needle and the second electrode needle, realizes electrojet printing of an insulating substrate, and solves the defect that the prior electrojet printing only adopts a conductive substrate.
(6) The ink supply mechanism in the invention adopts the scheme of external constant pressure control and ink through pipe conveying, realizes the continuous and stable supply of the electrojet printing ink, provides possibility for the design of large-area target electrojet printing patterns, and solves the problem of complicated steps of repeatedly taking needles and filling ink in the current electrohydrodynamic electrojet printing.
Drawings
FIG. 1 is a schematic diagram of data interaction between various sub-mechanisms of a hybrid-driven electrospray device applied to an insulating substrate according to the present invention;
FIG. 2 is a schematic diagram of the overall structure of a hybrid-driven electrospray device applied to an insulating substrate according to the present invention;
FIG. 3 is a schematic view of a hybrid-driven electrospray device applied to an insulating substrate according to the present invention;
FIG. 4 is a schematic diagram of an electrospray mechanism of the present invention applied to a hybrid-driven electrospray device for insulating substrate;
FIG. 5 is a schematic view of the liquid ejection process at the nozzle of the hybrid-driven electrospray device applied to an insulating substrate of the invention;
FIG. 6 is a schematic control flow chart of the hybrid-driven electrospray device applied to an insulating substrate according to the present invention.
Wherein, 1-an upper computer, 2-a signal generating device, 3-a low-voltage amplifier, 4-a constant-voltage output device, 5-a power amplifying power supply, 6-an adjusting bolt, 7-a fixed nut, 8-a top cap plate, 9-an inner electrode, 10-an outer electrode, 11-a piezoelectric ceramic stack, 12-an insulating shell, 13-a bottom cap plate, 14-a feeler lever, 15-a displacement amplifying lever, 16-a locking upright post, 17-a reset spring, 18-a movable contact, 19-a telescopic gap, 20-a fixed fulcrum shaft, 21-a needle fixed block, 22-a sealing ring, 23-a glass capillary tube, 24-a first electrode needle, 25-a nozzle, 26-a piston, 27-an injector, 28-a conveying pipe and 29-a second electrode needle, 30-insulating substrate.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples
As shown in fig. 1, the present embodiment provides a hybrid-driven electrospray device applied to an insulating substrate, including: the system comprises a main control mechanism, a piezoelectric actuating mechanism, a displacement amplifying mechanism, an electronic jet printing mechanism and an ink supply mechanism;
the piezoelectric actuating mechanism and the electronic jet printing mechanism are electrically connected with the main control mechanism;
as shown in fig. 2, the main control mechanism comprises an upper computer 1 and a signal generating device 2, and is used for supplying a pulse voltage of the piezoelectric actuating mechanism and a signal of a high-voltage electric field of the electronic jet printing mechanism;
the signal generating device of the embodiment can adopt a signal generator or a signal generating card and is in communication connection with an upper computer, and the signal generating device can output a first low-voltage electric signal and a second low-voltage electric signal;
as shown in fig. 3, the piezoelectric actuator includes a low voltage amplifier 3 and a piezoelectric ceramic stack actuator, the piezoelectric ceramic stack actuator includes an adjusting bolt 6, a fixing nut 7, a top cap plate 8, a piezoelectric ceramic stack 11, an inner electrode 9, an outer electrode 10, a bottom cap plate 13 and a contact rod 14, and is used for generating an excitation vibration displacement under a pulse voltage;
the input end of the low-voltage amplifier 3 is electrically connected with the output end of the signal generating device 2 and is used for amplifying a first low-voltage electric signal, the output end of the low-voltage amplifier 3 is electrically connected with the inner electrode and the outer electrode wrapping the piezoelectric ceramic stack 11, the piezoelectric ceramic stack 11 is formed by longitudinally stacking a plurality of piezoelectric ceramic pieces, and the piezoelectric ceramic stack is subjected to the amplified voltage V1The excitation can generate longitudinal deformation displacement; the adjusting bolt 6 penetrates through the insulating shell 12 to be connected with the top cap plate 8, and the top cap plate 8 and the bottom cap plate 13 are fixedly connected with the piezoelectric ceramic stack 11; the upper end of the feeler lever 14 is fixedly connected with the lower end of the bottom cap plate 13; the adjusting bolt 6 can adjust the height of an integral fixing structure formed by the piezoelectric ceramic stack 11, the top cap plate 8, the bottom cap plate 13 and the feeler lever 14, and the integral structure is fixed through the fixing nut 7;
in the embodiment, the displacement amplification mechanism adopts a lever displacement amplification structure and is divided into a short end of a lever of the displacement amplification mechanism and a long end of the lever of the displacement amplification mechanism according to the position of a fulcrum of the lever, and the piezoelectric ceramic stack actuating device pushes the displacement amplification mechanism to move according to the excitation vibration displacement;
in the present embodiment, the displacement amplification mechanism includes a displacement amplification lever 15, a locking column 16, a return spring 17, a fixed fulcrum 20, and a needle fixing block 21, for amplifying the excitation vibration displacement under the pulse voltage;
the displacement amplification lever is connected with a fixed fulcrum 20, the connecting point is the lever fulcrum position, the displacement amplification lever is divided into a short end and a long end according to the lever fulcrum position, the short end of the displacement amplification lever and the lower end of a contact rod form a movable contact 18, the short end of the displacement amplification lever 15 is driven to move up and down through the up-and-down vibration of the contact rod, the long end of the displacement amplification lever is connected with a needle fixing block 21, and the small displacement of the short end is converted into the up-and-down large displacement of the long end and the needle fixing block through the amplification effect; the bottom of the locking upright post 16 is fixedly connected with the insulating shell 12, and a telescopic gap 19 is formed between the top of the locking upright post 16 and the bottom of the short end of the displacement amplification lever and is used for relative movement between the displacement amplification lever and the locking upright post; the return spring 17 surrounds the outer side of the locking upright post 16, the upper part of the return spring 17 is fixedly connected with the bottom of the short end of the displacement amplification lever, or the upper part of the return spring 17 supports the bottom of the short end of the displacement amplification lever and is used for providing elastic restoring force for the initial position of the displacement amplification lever; the locking upright post is used for fixing the spring and limiting the stroke.
In this embodiment, the electrospray mechanism includes: the device comprises a power amplification power supply 5, a sealing ring 22, a glass capillary tube 23, a first electrode needle 24, a nozzle 25, a second electrode needle 29 and an insulating substrate 30, wherein the power amplification power supply is used for forming jet flow or liquid drops under the reciprocating motion of the first electrode needle and the action of a strong electric field so as to form an electronic jet printing pattern on the insulating substrate;
the input end of the power amplification power supply 5 is electrically connected with the output end of the signal generating device 2 and is used for amplifying a second low-voltage electric signal, the positive electrode output end of the power amplification power supply 5 is electrically connected with the outgoing line of the first electrode needle 24, the negative electrode output end of the power amplification power supply 5 is electrically connected with the outgoing line of the second electrode needle 29, and a high-voltage V can be formed between the first electrode needle and the second electrode needle2A strong electric field is generated;
the sealing ring 22 is arranged at one end of the glass capillary tube 23 and is used for sealing the glass capillary tube, the first electrode needle 24 is vertically arranged in a flow channel of the glass capillary tube 23, the tail end of the glass capillary tube 23 is provided with a nozzle 25, and the needle tip of the first electrode needle 24 can extend out of the edge of the nozzle;
as shown in fig. 4, the first electrode needle 24 is inserted straight into the flow channel of the glass capillary 23, and the needle tip may protrude from the edge of the nozzle 25; the needle point of the first electrode needle 24 and the needle point of the second electrode needle 29 are positioned on the same vertical direction line, and the direction line is vertical to the upper surface of the insulating substrate 30; the two electrode needles are fixed on the same fixing device (motion table), the two electrode needles move along with the motion of the motion table, and the needle point of the second electrode needle 29 is positioned right below the nozzle and moves synchronously.
As shown in fig. 5, the first electrode needle moves downwards and extends out of the edge of the nozzle, and the electrode needle drives the tip of the nozzle to form a conical liquid level under the action of the surface tension of the liquid; the second low-voltage electric signal is boosted to V by the power amplification power supply2Then adding the mixture to the first electrode needle and the second electrode needle, and further forming a strong electric field between needle points of the two electrode needles to drive the conical liquid level to deform into a Taylor cone; electrostatic force between the electrode needles overcomes the surface tension and viscous force of liquid, liquid at the tip of the Taylor cone is pulled down to form jet flow or liquid drops, and an electronic jet printing pattern is formed on the insulating substrate;
in the present embodiment, the ink supply mechanism includes the constant pressure output device 4, the plunger 26, the syringe 27, and the delivery pipe 28, and is used for the continuous and stable supply of liquid at the time of electrospraying.
The constant pressure output device 4 is used for keeping constant pressure, the output end of the constant pressure output device 4 is connected with the input end of an injector 27, the input end of the injector 27 is provided with a piston 26, the output end of the injector 27 is provided with a conveying pipe 28, the injector 27 is filled with ink liquid, the constant pressure output device drives the piston to push the ink liquid, and the ink is conveyed into a flow channel of the glass capillary tube through the conveying pipe 28.
The constant pressure output device of the embodiment can adopt a positive and negative air pressure pump or a nitrogen pressure control device, drives the piston to push the ink liquid downwards, and sends the ink into the nozzle flow channel through the conveying pipe, so that the continuous and stable ink supply can be realized in the electronic jet printing process.
The constant voltage output device of this embodiment keeps the constant voltage, at spouting the seal in-process, and the ink volume can reduce gradually, and the inside atmospheric pressure of syringe can reduce gradually, and the piston just can the downstream like this, orders about the syringe inner space and reduces, thereby atmospheric pressure crescent, maintains the inside atmospheric pressure of syringe and constant voltage output device pressure all the time and equals.
As shown in fig. 6, the present embodiment provides a control method of a hybrid-driven electrospray apparatus applied to an insulating substrate, comprising the steps of:
step 1: the master control mechanism outputs a first low-voltage electric signal which is boosted to V by a low-voltage amplifier1Then acting on the piezoelectric ceramic stack;
step 2: according to the inverse piezoelectric effect, the piezoelectric ceramic stack in the piezoelectric ceramic stack actuating device is excited by voltage to generate the longitudinal deformation displacement extension amount, and the feeler lever is further pushed to impact the short end of the displacement amplification lever;
and step 3: the lever converts the small displacement of the short end into the large displacement of the long end through the amplification effect and further converts the small displacement of the short end into the ascending displacement of the first electrode needle through the needle fixing block;
and 4, step 4: then the level of the excitation voltage applied to the piezoelectric actuator changes, the piezoelectric actuator restores to be deformed to an initial state, the short end of the displacement amplification lever restores to an initial position upwards under the restoring force action of a return spring, the short end of the displacement amplification lever converts the small displacement of the short end into the large displacement of the long end through the amplification action, and the large displacement of the long end is further converted into the downward feeding amount of the first electrode needle through the needle fixing block;
and 5: the first electrode needle moves downwards and extends out of the edge of the nozzle, and the electrode needle drives the tip of the nozzle to form a conical liquid level under the action of the surface tension of the liquid;
the electrode needle extends out of the edge of the nozzle to form a conical liquid level, the Taylor cone is generated by the action of an electric field, and the traditional electrofluid printing only depends on the electric field to form the Taylor cone, so that a problem is caused: the Taylor cone needs a long time to form, so that electrofluid printing is usually only a few hundred Hz, the electrofluid printing is not generally used as electric point spraying but used as electric spinning, the electric field energy and time required by the Taylor cone forming can be reduced by pre-forming a conical liquid level, and high-frequency spraying is realized.
Step 6: the master control mechanism outputs a second low-voltage electric signal which is boosted to V by the power amplification power supply2Then the first electrode needle and the second electrode needle are added,a strong electric field is formed between the needle points of the two electrode needles to drive the conical liquid level to be deformed into a Taylor cone;
and 7: electrostatic force between the electrode needles overcomes the surface tension and viscous force of liquid, liquid at the tip of the Taylor cone is pulled down to form jet flow or liquid drops, and an electronic jet printing pattern is formed on the insulating substrate;
and 8: after the jet printing is started, the constant is kept in a signal period, but the piezoelectric driving signal can generate a jump from high level to low level, namely, the first low-voltage electric signal is driven by a periodic signal to realize the controllable frequency of the electric dot jet, when the high level is turned to the low level (the piezoelectric excitation is removed), the lever drives the first electrode needle to return to the initial position under the action of the reset spring, the change of the second low-voltage electric signal is synchronous with the change of the first voltage electric signal, and the first low-voltage electric signal and the second low-voltage electric signal are removed at the same time, so that a strong electric field disappears, and the electric dot jet process in one period is completed.
Simultaneously removing the first low-voltage electric signal and the second low-voltage electric signal, and driving the first electrode needle to return to the initial position by the lever under the action of the return spring;
and step 9: and the electrostatic force disappears to make the Taylor cone at the tip end of the nozzle disappear, and the liquid level gradually returns to the initial state to finish the high-viscosity liquid spraying process in one period.
In practical application, if the continuous direct writing function of the electrospinning is to be realized, the first low-voltage electric signal and the second low-voltage electric signal with constant level polarity are adopted to drive on the basis of the high-viscosity liquid injection method, the level of the excitation voltage applied to the piezoelectric actuator is guaranteed to be constant, the edge position of the first electrode needle extending out of the nozzle is fixed, the level polarity is not changed by the constant voltage of the electric field, the Taylor cone cannot disappear after the first formation, the continuous downward stretching of the liquid injection is realized, and the line printing is completed.
In the embodiment, the first electrode needle can do reciprocating high-frequency motion in the flow channel of the capillary glass tube under the combined action of the piezoelectric actuating mechanism and the displacement amplifying mechanism, so that the phenomenon of liquid solute accumulation after standing and drying of liquid in the flow channel is overcome, and meanwhile, the telescopic motion of the needle tip at the nozzle can prevent the situation that high-viscosity liquid cannot be sprayed out and blocks the nozzle.
The hybrid drive electric jet printing system applied to the insulating substrate is used for realizing the electric jet printing pattern design of the insulating substrate, can freely jet high-viscosity ink without liquid blocking a nozzle, and simultaneously adopts an external ink supply mechanism to continuously supply ink for the electric jet printing process so as to realize large-area target electric jet printing equipment
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. A hybrid drive electrospray device applied to an insulating substrate, comprising: the system comprises a main control mechanism, a piezoelectric actuating mechanism, a displacement amplifying mechanism, an electronic jet printing mechanism and an ink supply mechanism;
the main control mechanism is provided with a signal generating device, the signal generating device is used for outputting a first low-voltage electric signal and a second low-voltage electric signal, the first low-voltage electric signal is used for adjusting the pulse voltage of the piezoelectric actuating mechanism, and the second low-voltage electric signal is used for adjusting the high-voltage electric field of the electronic jet printing mechanism;
the piezoelectric actuating mechanism is provided with a low-voltage amplifier and a piezoelectric ceramic stack actuating device, wherein the input end of the low-voltage amplifier is connected with the signal generating device and used for amplifying a first low-voltage electric signal, and the piezoelectric ceramic stack actuating device is connected with the output end of the low-voltage amplifier and used for generating excitation vibration displacement according to the amplified first low-voltage electric signal;
the displacement amplification mechanism adopts a lever displacement amplification structure and is divided into a short end of a lever of the displacement amplification mechanism and a long end of the lever of the displacement amplification mechanism according to the position of a fulcrum of the lever, and the piezoelectric ceramic stack actuating device pushes the short end of the lever of the displacement amplification mechanism to move according to the excitation vibration displacement;
the electronic jet printing mechanism comprises a power amplification power supply, a nozzle, a first electrode needle and a second electrode needle, wherein the power amplification power supply is connected with a signal generating device and is used for amplifying a second low-voltage electric signal;
the needle point of the first electrode needle can extend out of the edge of the nozzle, the needle point of the first electrode needle and the needle point of the second electrode needle are positioned on the same vertical direction line, the direction line is vertical to the upper surface of the insulating substrate, the first electrode needle is connected with the long end of a lever of a displacement amplification mechanism, and the long end of the lever of the displacement amplification mechanism drives the first electrode needle to vertically move up and down along an ink jet flow channel;
the ink supply mechanism is used for supplying ink to the electronic jet printing mechanism, and the electronic jet printing mechanism forms jet flow or liquid drops based on the reciprocating motion of the first electrode needle and the action of an electric field and forms an electronic jet printing pattern on the insulating substrate.
2. The hybrid driven electronic imprinting device applied to insulating substrates according to claim 1, wherein the displacement amplifying mechanism comprises a displacement amplifying lever, a fixed fulcrum and a pin fixing block, the displacement amplifying lever is connected with the fixed fulcrum, a connecting point is a lever fulcrum position, the displacement amplifying lever is divided into a short end and a long end according to the lever fulcrum position, the piezoelectric ceramic stack actuating device pushes the short end of the displacement amplifying lever to move according to the excitation vibration displacement, so as to drive the long end of the displacement amplifying lever to move, the long end of the displacement amplifying lever is connected with the pin fixing block, and the long end of the displacement amplifying lever drives the pin fixing block to move up and down;
the first electrode needle is connected with the needle fixing block, and the needle fixing block drives the first electrode needle to vertically move up and down along the ink jet flow channel.
3. The hybrid drive electronic imprinting device applied to the insulating substrate according to claim 1 or 2, wherein the displacement amplifying mechanism is further provided with a locking post and a return spring, the bottom of the locking post is fixedly connected with the insulating housing, the return spring surrounds the outside of the locking post, the short end of the lever of the displacement amplifying mechanism is provided with a telescopic gap with the top of the locking post, and the return spring supports the short end of the lever of the displacement amplifying mechanism for providing an elastic restoring force for the initial position of the displacement amplifying mechanism.
4. A hybrid driven electrospray device applied to an insulating substrate according to claim 1, wherein said piezoelectric ceramic stack actuation means comprises an adjusting bolt, a retaining nut, a top cap plate, a piezoelectric ceramic stack, an inner electrode, an outer electrode, a bottom cap plate and a feeler lever;
the inner electrode and the outer electrode wrap the piezoelectric ceramic stack and are connected with a first low-voltage electric signal, the adjusting bolt penetrates through the insulating shell to be connected with the top cap plate, the top cap plate and the bottom cap plate are respectively connected with the piezoelectric ceramic stack, the bottom cap plate is connected with the touch rod, the adjusting bolt is used for adjusting the height of an integral fixing structure formed by the piezoelectric ceramic stack, the top cap plate, the bottom cap plate and the touch rod, and the fixing nut is used for fixing the adjusting bolt;
the short end of the lever of the displacement amplification mechanism and the lower end of the contact rod form a movable contact, and the short end of the lever is driven to move up and down through the up-and-down vibration of the contact rod.
5. A hybrid driven electrospray device applied to an insulating substrate according to claim 1, wherein said ink supply mechanism comprises a constant pressure output device and an injector;
the constant voltage output device is used for keeping constant voltage, the constant voltage output device output is connected with the input of syringe, the input of syringe is equipped with the piston, the output of syringe is equipped with the conveyer pipe, the printing ink liquid is equipped with in the syringe, the printing ink liquid is pushed and shove to constant voltage output device drive piston, in the runner of delivering printing ink to the glass capillary through the conveyer pipe.
6. The hybrid driven electrospray device applied to an insulating substrate according to claim 1, wherein the electrospray mechanism is further provided with a glass capillary and a sealing ring, the sealing ring is provided at one end of the glass capillary and is used for sealing the glass capillary;
the first electrode needle is vertically arranged in a flow channel of the glass capillary tube, and the nozzle is arranged at the tail end of the glass capillary tube.
7. A hybrid driven electrospray device applied to an insulating substrate according to claim 1, wherein said master control mechanism is further provided with an upper computer communicatively connected to a signal generating device.
8. The control method of a hybrid driven electrospray device applied to an insulating substrate according to any one of claims 1 to 7, characterized by comprising the steps of:
the signal generating device outputs a first low-voltage electric signal and a second low-voltage electric signal, and the first low-voltage electric signal is boosted into a voltage excitation signal by a low-voltage amplifier and then acts on the piezoelectric ceramic stack actuating device;
the piezoelectric ceramic stack actuating device is excited by voltage to generate a longitudinal deformation displacement extension amount, pushes the short end of the displacement amplification lever, converts the short end displacement into long end displacement, and converts the long end displacement into the ascending movement amount of the first electrode needle through the needle fixing block;
changing the level polarity of the first low-voltage electric signal, recovering the deformation of the piezoelectric ceramic stack actuating device to an initial state, recovering the short end of the displacement amplification lever to an initial position, converting the short end displacement of the displacement amplification lever into the long end displacement of the displacement amplification lever, and converting the short end displacement into the downward feeding amount of the first electrode needle through the needle fixing block;
the first electrode needle moves downwards and extends out of the edge of the nozzle, and the first electrode needle drives the tip of the nozzle to form a conical liquid level;
and the second low-voltage electric signal is boosted by the power amplification power supply and then is transmitted to the first electrode needle and the second electrode needle, an electric field is formed between needle points of the first electrode needle and the second electrode needle, the conical liquid level is driven to deform into a Taylor cone to form jet flow or liquid drops, and an electronic jet printing pattern is formed on the insulating substrate.
9. The method as claimed in claim 8, wherein the first low voltage electrical signal is driven by a periodic signal, and when the first low voltage electrical signal changes from high level to low level, the second low voltage electrical signal changes synchronously with the first voltage electrical signal, and the first low voltage electrical signal and the second low voltage electrical signal are removed simultaneously to complete a periodic electrical dot-discharging process.
10. The control method of a hybrid driven electrospray device applied to an insulating substrate according to claim 8, wherein the first electrode needle is driven by a first low voltage electric signal and a second low voltage electric signal with constant level polarity while moving downwards and extending out of the nozzle edge, so as to realize continuous downward stretching of the liquid jet and complete line printing.
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