阅读说明：本技术 一种常温条件液态金属的微分配装置及其使用方法 (Differential distribution device for liquid metal under normal temperature condition and use method thereof ) 是由 周夫之 李跃斌 邓肖 于 2019-10-17 设计创作，主要内容包括：本发明涉及液态金属打印装置技术领域,具体来说是一种常温条件液态金属的微分配装置及其使用方法,其特征在于包括一压电陶瓷驱动器,通过电信号后能产生形变,一放大膜片,与压电陶瓷驱动器连接,压电陶瓷驱动器产生的形变会传递至放大膜片,并促使其产生形变,液压材料,设置于液压放大腔内,液压放大腔与放大膜片连接,放大膜片产生形变带动液压材料向下流动,一驱动膜片,设置于液压放大腔内部或底部,液压材料向下流动挤压驱动膜片,通过对传统压电撞针式喷头结构进行改造,有效避免了在微液滴产生过程中伴随大量卫星液滴的产生的情况,适用于在分配微量液态金属。(The invention relates to the technical field of liquid metal printing devices, in particular to a liquid metal differential distribution device under normal temperature and a use method thereof, it is characterized by comprising a piezoelectric ceramic driver which can generate deformation after passing through an electric signal, an amplifying diaphragm, connected with the piezoelectric ceramic driver, the deformation generated by the piezoelectric ceramic driver can be transferred to the amplifying diaphragm, and the hydraulic material is arranged in the hydraulic amplifying cavity, the hydraulic amplifying cavity is connected with the amplifying diaphragm, the amplifying diaphragm deforms to drive the hydraulic material to flow downwards, the driving diaphragm is arranged in the hydraulic amplifying cavity or at the bottom of the hydraulic amplifying cavity, the hydraulic material flows downwards to extrude the driving diaphragm, through reforming transform traditional piezoelectricity firing pin formula shower nozzle structure, effectively avoided the condition that produces in little liquid drop production in-process with a large amount of satellite droplets, be applicable to distributing trace liquid metal.)

1. A micro-distribution device for liquid metal under normal temperature condition is characterized by comprising

A piezoelectric ceramic driver which can generate deformation through electric signals,

an amplifying diaphragm connected with the piezoelectric ceramic driver, the deformation generated by the piezoelectric ceramic driver is transmitted to the amplifying diaphragm to drive the amplifying diaphragm to generate deformation,

the hydraulic material is arranged in the hydraulic amplifying cavity, the hydraulic amplifying cavity is connected with the amplifying diaphragm, the amplifying diaphragm deforms to drive the hydraulic material to flow downwards,

a driving diaphragm arranged in the hydraulic amplifying cavity or at the bottom, wherein the hydraulic material flows downwards to extrude the driving diaphragm,

a striker connected with the driving diaphragm, the driving diaphragm deforms to push the striker to move upwards, a spring is arranged at the top of the striker,

the piezoelectric buffering spray head is arranged at the bottom of the firing pin, the center of the piezoelectric buffering spray head is a capillary glass tube, buffering piezoelectric ceramics are arranged outside the capillary glass tube, and the deformation of the buffering piezoelectric ceramics drives the capillary glass tube to deform so as to buffer liquid drops.

2. A device for microdispensing liquid metal at ambient conditions as claimed in claim 1, wherein: the piezoelectric buffer nozzle comprises a piezoelectric buffer nozzle body which comprises: the piezoelectric ceramic type liquid level meter comprises a piezoelectric ceramic driver, a hydraulic amplification shell and a liquid supply shell, wherein the hydraulic amplification shell is positioned in the middle of the piezoelectric ceramic driver and the liquid supply shell, an amplification diaphragm is arranged at the joint of the piezoelectric ceramic driver and the hydraulic amplification shell, and a sealing ring is arranged at the joint of the hydraulic amplification shell and the liquid supply shell to form three independent cavities, namely a piezoelectric driving cavity, a hydraulic amplification cavity and a liquid supply cavity.

3. A device for microdispensing liquid metal at ambient conditions as claimed in claim 1, wherein: the amplifying diaphragm is arranged at the joint of the piezoelectric ceramic driver and the hydraulic amplifying shell, two sides of the amplifying diaphragm are sealed by the amplifying diaphragm sealing ring, the piezoelectric ceramic driver is arranged in the piezoelectric driving cavity and is positioned in the middle of the piezoelectric driving shell and the amplifying diaphragm, the early warning bolt is arranged above the piezoelectric ceramic driver, and the early warning bolt is adjusted to control the piezoelectric ceramic driver and amplify the contact effect of the diaphragm.

4. A device for microdispensing liquid metal under ambient conditions as claimed in claim 2, wherein: the joint of the hydraulic amplification shell and the liquid supply shell is provided with a sealing ring, two sides of the hydraulic amplification shell are sealed through the sealing ring, a spring mounting hole is formed in the middle of the hydraulic amplification shell and used for mounting a spring, a firing pin is mounted below the spring, a driving membrane is mounted on the lower surface of a firing pin moving disc and connected with the spring mounting hole, and a firing pin thimble part penetrates through the driving membrane and the liquid supply shell and is in contact with the piezoelectric buffer nozzle.

5. A device for microdispensing liquid metal under ambient conditions as claimed in claim 2, wherein: the liquid supply shell is provided with a liquid path pipe on the left side, a liquid storage bottle is arranged above the liquid path pipe, liquid metal is filled in the liquid storage bottle and connected with an air pressure controller, a nitrogen flow guider is arranged below the liquid supply shell, the middle of the liquid supply shell and the nitrogen flow guider is sealed through a nitrogen sealing ring, a piezoelectric buffering spray head is arranged on the liquid supply shell, a spray head sealing ring is arranged in the middle of the piezoelectric buffering spray head, the lower part of the piezoelectric buffering spray head is fixed through the nitrogen flow guider, a nitrogen connector is arranged on the side surface of the nitrogen flow guider and connected with nitrogen, and the nitrogen is.

6. A device for microdispensing liquid metal at ambient conditions as claimed in claim 1, wherein: the piezoelectric buffer nozzle comprises a piezoelectric buffer nozzle impact ring, adhesive, a piezoelectric buffer nozzle shell, a capillary glass tube, piezoelectric ceramics, piezoelectric ceramic adhesive, a piezoelectric ceramic anode lead and a piezoelectric ceramic cathode lead, the center of the piezoelectric buffer nozzle impact ring is a conical hole, matched with a firing pin thimble, the impact ring of the piezoelectric buffer nozzle is bonded with the capillary glass tube through bonding glue, the piezoelectric ceramics is in a cylindrical structure and is sleeved outside the capillary glass tube and bonded by using the piezoelectric ceramics bonding glue, the upper side and the lower side of the piezoelectric ceramics are connected with a piezoelectric ceramics positive lead and a piezoelectric ceramics negative lead, and voltage signals are applied to the piezoelectric ceramics positive lead and the piezoelectric ceramics negative lead, thereby can make piezoceramics take place to deform and drive the deformation of capillary glass pipe, the shower nozzle shell passes through colloid and piezoelectricity buffering shower nozzle impingement ring bonding, and capillary glass pipe passes shower nozzle shell concentric hole.

7. A micro-dispensing device for liquid metal at ambient conditions as recited in claim 5, wherein: the nitrogen sealing ring and the nitrogen guider are sealed to form a nitrogen cavity, nitrogen is input into the nitrogen cavity through the nitrogen connector to be compressed, and annular high-speed air flow is formed through the nitrogen guiding channel, so that a compact nitrogen wall is formed at the nozzle, and the nozzle is filled with the nitrogen.

8. A method of using the ambient condition liquid metal microdispensing device of claim 1, comprising:

A. filling liquid metal into a liquid storage bottle;

B. the liquid storage bottle applies gas pressure, and the liquid metal is input into the liquid supply cavity through the liquid path pipe;

C. inputting a signal to the piezoelectric ceramic driver to enable the piezoelectric ceramic driver to expand longitudinally, extruding the amplifying diaphragm to enable the amplifying diaphragm to expand downwards, and pushing the driving diaphragm to move and the firing pin to move upwards by the hydraulic material;

D. a liquid drop channel in the piezoelectric buffer nozzle is filled with solution;

E. when the signal of the piezoelectric ceramic driver is disconnected, the piezoelectric ceramic driver contracts longitudinally, the amplifying diaphragm is squeezed to restore the piezoelectric ceramic driver upwards, the spring pushes the striker to move downwards, and the liquid metal is extruded out of the liquid drop channel by the striker;

F. the piezoelectric buffer nozzle applies an electric signal, the capillary glass tube deforms, and the liquid drop state is kept stable.

Technical Field

The invention relates to the technical field of liquid metal printing devices, in particular to a liquid metal differential distribution device under a normal temperature condition and a use method thereof.

Background

Liquid metal is a large class of functional materials, such as gallium, bismuth alloys and certain alloys, which have excellent electrical and thermodynamic properties and can be applied to electronic additive manufacturing and computer heat dissipation technologies. Because of the excellent performance of liquid metal, the liquid metal is used as a substitute product for replacing the traditional circuit printing or heat dissipation silicon material, the preferable liquid drop printing spray head scheme is a piezoelectric ink jet spray head and a piezoelectric striker type spray head, but because the surface tension of the liquid metal is large, the piezoelectric ink jet spray head cannot overcome the surface tension to form liquid drops, the piezoelectric striker type spray head can obtain the liquid drops, but a large amount of satellite liquid drops can be formed while obtaining the liquid drops, and the current production requirement cannot be met; therefore, at present, the liquid metal can be printed only by using a mechanical extrusion method or a gas extrusion method, but the uniformity of the obtained liquid drops is poor, and micron-level liquid drops cannot be obtained.

Disclosure of Invention

The invention aims to solve the defects of the prior art and provides a liquid metal differential distribution device under normal temperature condition and a use method thereof, wherein the liquid metal differential distribution device does not form a large amount of satellite droplets.

In order to achieve the purpose, the micro-distribution device for the liquid metal under the normal temperature condition is designed, and is characterized by comprising a piezoelectric ceramic driver, an amplifying diaphragm, a driving diaphragm and a firing pin, wherein the piezoelectric ceramic driver can generate deformation through electric signals, the amplifying diaphragm is connected with the piezoelectric ceramic driver, the deformation generated by the piezoelectric ceramic driver is transmitted to the amplifying diaphragm and causes the amplifying diaphragm to generate deformation, the hydraulic material is arranged in a hydraulic amplifying cavity, the hydraulic amplifying cavity is connected with the amplifying diaphragm, the amplifying diaphragm generates deformation to drive the hydraulic material to flow downwards, the driving diaphragm is arranged in the hydraulic amplifying cavity or at the bottom, the hydraulic material flows downwards to extrude the driving diaphragm, the firing pin is connected with the driving diaphragm, the driving diaphragm deforms to push the firing pin to move upwards, a spring is arranged at the top of the firing pin, a piezoelectric buffer nozzle is arranged at the bottom of the firing pin, a capillary glass tube is, the deformation of the buffer piezoelectric ceramic drives the capillary glass tube to deform, and the capillary glass tube is used for buffering liquid drops.

The piezoelectric buffer nozzle comprises a piezoelectric buffer nozzle body which comprises: the piezoelectric ceramic type liquid level meter comprises a piezoelectric ceramic driver, a hydraulic amplification shell and a liquid supply shell, wherein the hydraulic amplification shell is positioned in the middle of the piezoelectric ceramic driver and the liquid supply shell, an amplification diaphragm is arranged at the joint of the piezoelectric ceramic driver and the hydraulic amplification shell, and a sealing ring is arranged at the joint of the hydraulic amplification shell and the liquid supply shell to form three independent cavities, namely a piezoelectric driving cavity, a hydraulic amplification cavity and a liquid supply cavity.

The amplifying diaphragm is arranged at the joint of the piezoelectric ceramic driver and the hydraulic amplifying shell, two sides of the amplifying diaphragm are sealed by the amplifying diaphragm sealing ring, the piezoelectric ceramic driver is arranged in the piezoelectric driving cavity and is positioned in the middle of the piezoelectric driving shell and the amplifying diaphragm, the early warning bolt is arranged above the piezoelectric ceramic driver, and the early warning bolt is adjusted to control the piezoelectric ceramic driver and amplify the contact effect of the diaphragm.

The joint of the hydraulic amplification shell and the liquid supply shell is provided with a sealing ring, two sides of the hydraulic amplification shell are sealed through the sealing ring, a spring mounting hole is formed in the middle of the hydraulic amplification shell and used for mounting a spring, a firing pin is mounted below the spring, a driving membrane is mounted on the lower surface of a firing pin moving disc and connected with the spring mounting hole, and a firing pin thimble part penetrates through the driving membrane and the liquid supply shell and is in contact with the piezoelectric buffer nozzle.

The liquid supply shell is provided with a liquid path pipe on the left side, a liquid storage bottle is arranged above the liquid path pipe, liquid metal is filled in the liquid storage bottle and connected with an air pressure controller, a nitrogen flow guider is arranged below the liquid supply shell, the middle of the liquid supply shell and the nitrogen flow guider is sealed through a nitrogen sealing ring, a piezoelectric buffering spray head is arranged on the liquid supply shell, a spray head sealing ring is arranged in the middle of the piezoelectric buffering spray head, the lower part of the piezoelectric buffering spray head is fixed through the nitrogen flow guider, a nitrogen connector is arranged on the side surface of the nitrogen flow guider and connected with nitrogen, and the nitrogen is.

The piezoelectric buffer nozzle comprises a piezoelectric buffer nozzle impact ring, adhesive, a piezoelectric buffer nozzle shell, a capillary glass tube, piezoelectric ceramics, piezoelectric ceramic adhesive, a piezoelectric ceramic anode lead and a piezoelectric ceramic cathode lead, the center of the piezoelectric buffer nozzle impact ring is a conical hole, matched with a firing pin thimble, the impact ring of the piezoelectric buffer nozzle is bonded with the capillary glass tube through bonding glue, the piezoelectric ceramics is in a cylindrical structure and is sleeved outside the capillary glass tube and bonded by using the piezoelectric ceramics bonding glue, the upper side and the lower side of the piezoelectric ceramics are connected with a piezoelectric ceramics positive lead and a piezoelectric ceramics negative lead, and voltage signals are applied to the piezoelectric ceramics positive lead and the piezoelectric ceramics negative lead, thereby can make piezoceramics take place to deform and drive the deformation of capillary glass pipe, the shower nozzle shell passes through colloid and piezoelectricity buffering shower nozzle impingement ring bonding, and capillary glass pipe passes shower nozzle shell concentric hole.

The nitrogen sealing ring and the nitrogen guider are sealed to form a nitrogen cavity, nitrogen is input into the nitrogen cavity through the nitrogen connector to be compressed, and annular high-speed air flow is formed through the nitrogen guiding channel, so that a compact nitrogen wall is formed at the nozzle, and the nozzle is filled with the nitrogen.

The method of the normal-temperature liquid metal micro-distribution device is characterized in that:

A. filling liquid metal into a liquid storage bottle;

B. the liquid storage bottle applies gas pressure, and the liquid metal is input into the liquid supply cavity through the liquid path pipe;

C. inputting a signal to the piezoelectric ceramic driver to enable the piezoelectric ceramic driver to expand longitudinally, extruding the amplifying diaphragm to enable the amplifying diaphragm to expand downwards, and pushing the driving diaphragm to move and the firing pin to move upwards by the hydraulic material;

D. a liquid drop channel in the piezoelectric buffer nozzle is filled with solution;

E. when the signal of the piezoelectric ceramic driver is disconnected, the piezoelectric ceramic driver contracts longitudinally, the amplifying diaphragm is squeezed to restore the piezoelectric ceramic driver upwards, the spring pushes the striker to move downwards, and the liquid metal is extruded out of the liquid drop channel by the striker;

F. the piezoelectric buffer nozzle applies an electric signal, the capillary glass tube deforms, and the liquid drop state is kept stable.

Compared with the prior art, the invention has the advantages that:

1. through reforming transform traditional piezoelectricity firing pin formula shower nozzle structure, effectively avoided the condition that produces in little liquid drop production in-process with a large amount of satellite droplets, be applicable to distributing trace liquid metal.

2. The center of the piezoelectric buffer nozzle is a capillary glass tube, buffer piezoelectric ceramics are arranged outside the capillary glass tube, when a firing pin extrudes metal ink to the piezoelectric buffer nozzle, the metal ink forms liquid drops through a narrow channel of the piezoelectric buffer nozzle, the potential energy of the liquid drops is increased, the capillary glass tube is driven to deform through the buffer piezoelectric ceramics, the formed liquid drops can be buffered, the potential energy of the liquid drops is reduced, the speed of the liquid drops is reduced when the liquid drops pass through a nozzle, and therefore the generation of satellite liquid drops is reduced, nitrogen is filled in the nitrogen flow guider, an annular nitrogen wall is formed, and the rapid oxidation of oxygen to the liquid drops can be avoided.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of a portion of the present invention;

in the figure: 1. the early warning bolt 2, the piezoelectric driving shell 3, the piezoelectric ceramic driver 4, the amplifying diaphragm 5, the amplifying diaphragm sealing ring 6, the hydraulic amplifying shell 7, the hydraulic material 8, the sealing ring 9, the sealing ring 10, the liquid supply shell 11, the piezoelectric buffer nozzle information line installation channel 12, the piezoelectric buffer nozzle 13, the nitrogen fluid director 14, the liquid storage bottle 15, the spring 16, the driving diaphragm 17, the liquid path pipe 18, the striker 19, the nitrogen sealing ring 20, the nitrogen connector 21, the nozzle sealing ring 22, the nitrogen fluid guide channel 23, the liquid drop channel 24, the piezoelectric buffer nozzle impact ring 25, the adhesive 26, the piezoelectric buffer nozzle shell 27, the capillary glass pipe 28, the piezoelectric ceramic adhesive 30, the piezoelectric ceramic positive wire 31, the piezoelectric ceramic negative wire 32, the impact surface 33, the nozzle 34, the piezoelectric driving cavity 35, the hydraulic amplifying cavity 36 and the liquid supply cavity 37. Spring mounting hole 38, moving plate 39, thimble 40, colloid 41, nitrogen chamber.

Detailed Description

The construction and principles of such a device will be apparent to those skilled in the art from the following further description of the invention taken in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1

The piezoelectric driving unit includes: the early warning device comprises an early warning bolt 1, a piezoelectric driving shell 2, a piezoelectric ceramic driver 3, an amplifying diaphragm 4 and an amplifying diaphragm sealing ring 5; the hydraulic pressure amplification unit includes: the hydraulic pressure amplifying device comprises a hydraulic pressure amplifying shell 6, a hydraulic pressure material 7, a sealing ring 8, a sealing ring 9, a spring 15, a driving diaphragm 16 and a firing pin 18; the piezoelectric buffer injection unit includes: the device comprises a liquid supply shell 10, a piezoelectric buffer nozzle 12, a nitrogen flow guider 13, a liquid pipeline 17, a liquid storage bottle 14 and a nitrogen connector 20; the piezoelectric buffer nozzle comprises: the piezoelectric ceramic driver 3, the hydraulic amplification shell 6 and the liquid supply shell 10 are connected through threads to serve as a main body of the device, and the hydraulic amplification shell 6 is located in the middle of the piezoelectric ceramic driver 3 and the liquid supply shell 10 and is connected through threads on two sides of the hydraulic amplification shell 6; the device comprises an amplifying diaphragm 4, a sealing ring 9, a piezoelectric ceramic driver 3, a hydraulic amplifying shell 6, a liquid supply shell 10, a piezoelectric driving cavity 34, a hydraulic amplifying cavity 35 and a liquid supply cavity 36, wherein the amplifying diaphragm 4 is arranged at the joint of the piezoelectric ceramic driver 3 and the hydraulic amplifying shell 6, and the sealing ring 9 is arranged at the joint of the hydraulic amplifying shell 6 and the liquid supply shell 10.

Amplify diaphragm 4 and install in piezoceramics driver 3 and 6 junctions of hydraulic pressure amplification shell, carry out both sides through amplifying diaphragm sealing washer 5 and seal, piezoceramics driver 3 is installed to piezoelectric drive chamber 34, is located piezoelectric drive shell 2 and amplifies 4 middle parts of diaphragm, and 3 top installation early warning bolts 1 of piezoceramics driver adjust early warning bolt 1 and be used for controlling piezoceramics driver 3 and amplify 4 contact effects of diaphragm.

The sealing ring 9 is arranged at the joint of the hydraulic amplification shell 6 and the liquid supply shell 10, the two sides of the hydraulic amplification shell are sealed by the sealing ring 8, the middle of the hydraulic amplification shell 6 is provided with a spring mounting hole 37, a spring 15 is mounted, a firing pin 18 is mounted below the spring 15 and contacts with the upper surface of a moving disc 38 of the firing pin 18, the lower surface of the moving disc 38 is provided with a driving diaphragm 16, and the driving diaphragm 16 is connected with the mounting hole 37 through threads; the plunger 18 is partially inserted into the plunger 39 through the driving diaphragm 16 to supply the liquid housing 10 to contact the piezoelectric buffer nozzle 12.

A liquid path pipe 17 is arranged at the left side of the liquid supply shell 10, a liquid storage bottle 14 is arranged above the liquid path pipe 17, and liquid metal is filled in the liquid storage bottle 14 and is connected with an air pressure controller; the nitrogen flow guider 13 is arranged below the liquid supply shell 10, the middle of the liquid supply shell 10 and the nitrogen flow guider 13 is sealed through a nitrogen sealing ring 19, the piezoelectric buffer nozzle 12 is arranged on the liquid supply shell 10, the middle of the piezoelectric buffer nozzle is provided with a nozzle sealing ring 21, the lower part of the piezoelectric buffer nozzle 12 is fixed through the nitrogen flow guider 13, a nitrogen connector 20 is arranged on the side surface of the nitrogen flow guider 13 and connected with nitrogen, and the nitrogen is used for preventing liquid drops formed by liquid metal from being oxidized.

As shown in fig. 2, the used piezoelectric buffer nozzle 12 comprises a piezoelectric buffer nozzle impact ring 24, adhesive 25, a piezoelectric buffer nozzle shell 26, a capillary glass tube 27, piezoelectric ceramics 28, piezoelectric ceramic adhesive 29, a piezoelectric ceramic positive electrode lead 30 and an electric ceramic negative electrode lead 31; the center of the piezoelectric buffer nozzle impact ring 24 is a conical hole and is matched with the thimble 39 of the firing pin 18, the piezoelectric buffer nozzle impact ring 24 is bonded with the capillary glass tube 27 through bonding glue 25, the piezoelectric ceramic 28 is in a cylindrical structure and is sleeved outside the capillary glass tube 27 and bonded by using piezoelectric ceramic bonding glue 29, the upper side and the lower side of the piezoelectric ceramic 28 are connected with a piezoelectric ceramic anode lead 30 and an electric ceramic cathode lead 31, the piezoelectric ceramic 28 can be deformed by applying voltage signals to the piezoelectric ceramic anode lead 30 and the electric ceramic cathode lead 31 so as to drive the capillary glass tube 27 to deform, the nozzle shell 26 is bonded with the piezoelectric buffer nozzle impact ring 24 through a colloid 40, and the capillary glass tube 27 passes through a concentric hole of the nozzle shell 26.

As shown in fig. 1, which is a structural diagram of the nitrogen deflector 13, the nitrogen sealing ring 21 and the nitrogen deflector 13 are sealed to form a nitrogen chamber 41, nitrogen is input into the nitrogen chamber 41 through the nitrogen connector 20 and compressed, and an annular high-speed air flow is formed through the nitrogen diversion channel 22, so that a dense nitrogen wall is formed at the nozzle, and the nozzle is filled with nitrogen.

The using method comprises the following specific steps:

liquid metal is filled into a liquid storage bottle 14, gas pressure is applied to the liquid storage bottle 14, the liquid metal is input into a liquid supply cavity 36 through a liquid pipeline 17, a signal is input to a piezoelectric ceramic driver 3 to enable the piezoelectric ceramic driver 3 to longitudinally expand, an amplification diaphragm 4 is squeezed to enable the amplification diaphragm to downwardly expand, a hydraulic material 7 pushes a driving diaphragm 16 to move and pushes a striker 18 to upwardly move, a liquid drop channel 23 in a piezoelectric buffer nozzle 12 is filled with solution, at the moment, the piezoelectric ceramic driver 3 is disconnected in signal, the piezoelectric ceramic driver 3 longitudinally contracts, the amplification diaphragm 4 is squeezed to enable the amplification diaphragm to upwardly recover, a spring 15 pushes the striker 18 to downwardly move, the striker 18 reduces the liquid metal to be extruded from the liquid drop channel 23, in the extruding process, the piezoelectric buffer nozzle applies an electric signal, a capillary glass tube 27 deforms, and the liquid drop state is.