CN112695388B

CN112695388B - Electrostatic spinning device for continuously supplying liquid and discharging liquid

Info

Publication number: CN112695388B
Application number: CN202011526922.8A
Authority: CN
Inventors: 张大明; 宫鹤; 王菲; 孙小强; 陈长鸣; 王希斌; 顾洪军
Original assignee: Jilin University
Current assignee: Jilin University
Priority date: 2020-12-22
Filing date: 2020-12-22
Publication date: 2021-12-21
Anticipated expiration: 2040-12-22
Also published as: CN112695388A

Abstract

The invention discloses an electrostatic spinning device for continuously supplying liquid and discharging liquid, which comprises a three-way pipe, an electrospinning solution bottle and a propelling device, wherein the output end of the three-way pipe is communicated with a spinning needle head; the electrospinning solution bottle is provided with a first output end and a second output end; a first input end and a first output end of the three-way pipe are communicated with a first injector through a first check valve group, and a second input end and a second output end of the three-way pipe are communicated with a second injector through a second check valve group; the propulsion device comprises a base platform for supporting the propulsion device and a single-screw pair movement mechanism for controlling the first injector and the second injector to move; the single-screw pair movement mechanism comprises a screw rod driven by a motor and a screw rod sliding block movably sleeved outside the screw rod through threads; the lower part of the screw rod slide block is connected with a needle cylinder of a first injector, and the upper part of the screw rod slide block is connected with a piston of the first injector. The two injectors circularly perform liquid discharging and liquid adding processes, and the uninterrupted spinning operation of liquid inlet and outlet is realized stably. Greatly shortens the spinning time and improves the spinning efficiency and quality.

Description

Electrostatic spinning device for continuously supplying liquid and discharging liquid

Technical Field

The invention relates to the field of preparation of nanofiber materials, in particular to an electrostatic spinning device for continuously supplying liquid and discharging liquid.

Background

High-voltage electrostatic spinning is an electrospinning technology, which is used for spinning nano-to micron-sized fibers, and with the continuous development of science and technology, the process is continuously improved, the yield of synthetic fibers is higher and higher, and the technology is widely applied to the fields of environment, energy, military, architecture, biomedicine and the like. Nanofiber is a new technology for preparing fiber, and is a technology which is developed along with the development of nanotechnology, and is a revolutionary technology.

The application range of the nano fiber is very wide and almost extends to all aspects of production and life. The medicine carrier, the hemostatic material and the wound material can be prepared medically; cosmetic raw materials for skin cleansers and masks; the application of the nanofiber in more advanced industries is the preparation of tissue engineering scaffold materials and barrier filter materials, such as skin regeneration, cornea regeneration, air filters, nano electronic materials and the like, and the development of the nanofiber is significant in the textile industry.

Fibers having a width of 1 nm to 100 nm are called nanofibers in a narrow sense, and fibers having a characteristic dimension of several hundreds of nm are called nanofibers in a broad sense. The nanofiber material has the advantages of superfine diameter, high specific surface area, porosity and the like, and attracts scholars in many fields, the preparation method of the nanofiber is endless up to now, and due to the problems of low preparation yield, technical limitation and the like, the preparation method of the nanofiber breaks through many technical problems after hundreds of years of development, the preparation of the nanofiber reaches a considerable scale, the quality is considerable, but the manufacturing cost of the nanofiber material is still high, and therefore, the research value in the field is very huge.

The traditional electrostatic spinning machine has single function, the injection mechanism of the traditional electrostatic spinning machine only consists of a syringe, the liquid adding efficiency is low, and the liquid adding is not easy to adjust.

Disclosure of Invention

The invention aims to provide an electrostatic spinning device for continuously supplying and discharging liquid with high-efficiency and controllable liquid supply, so as to solve the defects in the technology.

In order to achieve the above purpose, the invention provides the following technical scheme:

an electrospinning device for continuously supplying a liquid effluent, comprising:

the method comprises the following steps: a propelling device for communicating the three-way pipe with the electrospinning solution bottle;

the output end of the three-way pipe is connected with a spinning needle head;

the electrospinning solution bottle is provided with a first output end and a second output end;

the first input end and the first output end of the three-way pipe are communicated with a first injector through a first check valve group, and the second input end and the second output end of the three-way pipe are communicated with a second injector through a second check valve group;

the propulsion device comprises: a single screw pair motion mechanism supporting the base platform of the propulsion device and simultaneously controlling the motion of the first syringe and the second syringe;

the single-screw pair motion mechanism comprises: the screw rod is driven by a motor, and the screw rod sliding block is movably sleeved outside the screw rod through threads;

the lower part of the screw rod sliding block is connected with the needle cylinder of the first injector, and the upper part of the screw rod sliding block is connected with the piston of the second injector.

Furthermore, the propelling device also comprises limit switches arranged at corresponding positions on two sides of the screw rod and used for limiting the movement distance of the screw rod sliding block.

Furthermore, the propulsion device further comprises a control system, wherein the control system comprises a single chip microcomputer, a liquid crystal display screen and a user interaction operation panel, and the single chip microcomputer controls the motor to operate.

Further, the single chip microcomputer is STC8A8K64S4A2 in model number.

Furthermore, the base platform is fixedly connected with a plastic plate for separating the motor from the first injector and the second injector.

Further, the spinning needle comprises: the device comprises a needle head bead head, a piston arranged in the tube wall of the spinning needle head and a bead head propelling device connected with the piston;

the piston is connected with the needle head bead head, a needle head liquid outlet hole is formed in the tail end of the tube wall, and the bead head propelling device controls the movement position of the needle head bead head;

and a cavity formed between the piston and the tail end of the pipe wall is provided with a liquid supplementing channel which can be communicated with the output end of the three-way pipe.

Furthermore, the electrostatic spinning device is also provided with an observation device which comprises a control device and a CCD high-speed camera arranged right above the spinning needle head.

In the technical scheme, the two injectors are matched with each other, one injector always injects the liquid into the three-way pipe at any time, and the other injector always adds the liquid into the cavity of the injector. The electrospinning solution bottle can be a soft bottle or a hard bottle, the size of the bottle does not influence the spinning effect, and the electrospinning solution can be supplemented into the bottle in the spinning process. The two injectors circularly perform liquid discharging and liquid adding processes, and the uninterrupted spinning operation of liquid inlet and outlet is realized stably. Greatly shortens the spinning time and improves the spinning efficiency and quality.

Drawings

In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.

FIG. 1 is a schematic structural diagram of a spinning apparatus according to the present invention;

FIG. 2 is a schematic view of the structure of the spinning needle of the present invention;

FIG. 3 is an overall view of the bead propelling device and the spinning needle attachment of the present invention;

FIG. 4 is a schematic view of the observation device according to the present invention;

fig. 5 is a schematic diagram of the camera of the present invention taking pictures.

Description of reference numerals:

1. a motor; 2. a coupling; 3. a limit switch; 4. a screw rod slide block; 51. a first syringe; 52. a second syringe; 61. a first output terminal; 62. a second output terminal; 71. a first input terminal; 72. a second input terminal; 7. a three-way pipe; 8. a lead screw fixing block; 101. a first check valve group; 102. a second check valve group; 11. an electrospinning solution bottle; 12. a needle tail fixing block; 13. a screw rod; 14. a base platform; 200. a central bore; 201. an internal bore; 202. a first channel; 203. a second channel; 204. a groove;

91. a needle bead head; 93. a bead head propelling device; 94. a needle head liquid outlet hole; 95. and a fluid infusion channel.

Detailed Description

In order to make the technical solutions of the present invention better understood, those skilled in the art will now describe the present invention in further detail with reference to the accompanying drawings.

As shown in fig. 1 to 5, a lead screw fixing block 8 is fixed on the support platform of the present invention, and is used for rotatably supporting two ends of a lead screw 13 by a bearing or other common means. The input end of the screw rod 13 is connected with the motor 1 through the coupler 2, and the screw rod 13 can be driven to rotate by the rotation of the motor 1. The screw rod sliding block is internally provided with a nut matched with the screw rod 13, and the screw rod 13 rotates to drive the screw rod sliding block 4 to linearly move on the screw rod 13.

The first syringe 51 and the second syringe 52 are juxtaposed on the upper and lower sides of the screw slider 4.

A first injector 51 is arranged below the screw rod 13, a push rod of a driving piston of the first injector is fixedly connected with a needle tail fixing block fixed on the base platform 14, and the outer part of the needle cylinder is fixed with the screw rod sliding block 4. The position of the needle cylinder can be changed by moving the screw rod sliding block 4, and the cavity of the first injector is changed.

A second injector 52 fixed with the base platform 14 is arranged above the screw rod 13, the screw rod slide block 4 is fixedly connected with a push rod of a piston thereof, and the cavity of the second injector can be changed by moving the screw rod slide block 4.

The first injector 51 and the second injector 52 are used to flow the liquid in the bottle 11 of electrospinning solution into the tee 7, thereby flowing the liquid into the spinning needle. The syringe body is preferably made of copper electroplating material, the corrosion resistance is high, the hardness is high, the tube wall is made of glass, and the solution residue can be observed through transparent glass. The first syringe 51 and the second syringe 52 are always in opposite movement states, wherein one of the pistons is pressed, and the other piston is pushed or pulled.

The outlet of the second injector 52, the second output 62, and the second input 72 are all controlled by a second check valve set 102. The second check valve set 102 is a three-way valve commonly used in the hydraulic field, and has a function of controlling the outlet of the second injector 52 to be communicated with the second input end 72 and the second output end 62 to be closed; and two control states in which the outlet of the second injector 52 is controlled to communicate with the second output 62 and the second input 72 is closed.

The outlet of the first injector 51, the first output 61, and the first input 71 are all controlled by a first set of check valves 101. The first check valve group 101 is a three-way valve commonly used in the hydraulic field, and has a function of controlling the communication between the outlet of the first injector 51 and the first input end 71 and the closing of the first output end 61; and two control states of controlling the outlet of the first syringe 51 to communicate with the first output end 61 and the first input end 71 to be closed.

When the screw rod slide block 4 moves in the direction away from the spinning needle, the first check valve group 101 controls the communication between the outlet of the first injector 51 and the first input end 71 and the closing of the first output end 61, and the liquid in the first injector 51 extruded by the piston flows into the spinning needle through the first input end 71; meanwhile, the second check valve set 102 controls the second input end 72 to be closed, the outlet of the second syringe 52 is communicated with the second output end 62, and the piston of the second syringe 52 is pulled to fill the syringe cavity.

When the screw rod sliding block 4 moves close to the direction of the spinning needle, the first check valve group 101 controls the communication between the outlet of the first injector 51 and the first output end 61, the first input end 71 is closed, and the gas in the tube is expanded in the process of the piston retreat of the injector, so that the liquid in the electrospinning solution bottle 11 is added into the cavity of the first injector 51 through the first output end 61; meanwhile, the second check valve set 102 controls the second output end 62 to be closed, the outlet of the second injector 52 is communicated with the second input end 72, the piston of the second injector 52 is extruded, and the liquid flows into the spinning needle through the second input end 72.

Repeated push-and-pull lead screw slider 4 discovery, every syringe circulation goes out liquid and liquid feeding process, liquid feeding that just can infinitely time, can both fill up in addition at every turn, can not have the problem of weeping. Because the liquid filling is needed, the whole working process is not continuous in fact, the liquid filling is needed for a period of time after the injection is finished, and if the speed of moving the syringe piston is the same, the time used in the injection and liquid filling processes is the same. So two identical syringes are used, one filled with liquid being injected out at the same time, the other empty being filled into the tube. After the piston moves to the end point, the screw rod sliding block touches the limit switch, the control system controls the motor to stop and then starts to rotate in the reverse direction according to the original speed, the two pistons move in the reverse direction, the roles of the two injectors are exchanged, the injector which has injected the solution outside before the rotation direction of the motor is exchanged to start to add the solution into the injector, the injector which has added the solution in the injector cavity before the rotation direction of the motor is exchanged to fill the solution and then injects the solution outside, the two injectors are mutually matched, one injector always injects the solution into the three-way pipe at any time, and the other injector always adds the solution into the injector cavity. The electrospinning solution bottle 11 can be a soft bottle or a hard bottle, the size of the bottle does not affect the spinning effect, and the electrospinning solution can be supplemented into the bottle in the spinning process.

Preferably, the propulsion device uses a high-performance and anti-interference STC8A8K64S4A2 single chip microcomputer as a controller of equipment, and a liquid crystal display, a rotary encoder, a key and a switch are connected to an I/O port of the single chip microcomputer to serve as an operation panel for user interaction. PWM waves generated by the port of the single chip microcomputer indirectly control the motor 1 to operate through a motor driver, and the motor 1 pushes the injector to move forward and backward at a constant speed according to a plan after passing through the speed reducer, so that the whole textile work is ensured to be stably carried out.

The control system adopts an STC8A8K64S4A2 main control chip, realizes that the rotating speed of a stepping motor is controlled to accurately control the extruding speed of the high-voltage electrostatic spinning solution, and can realize accurate control on the extruding speed of the high-voltage electrostatic spinning solution through keys, pause and operation of a rotary encoder motor, setting of the rotating direction of the motor and self-defining of the rotating speed, and people in the field should think that the STC8A8K64S4A2 type single chip microcomputer also considers the tasks of environment temperature detection and intelligent regulation in the high-voltage electrostatic spinning system at the same time, and then can display information such as the system temperature, the target temperature, the current motor working state, the rotating speed and the like on a liquid crystal display screen in real time.

The equipment related to high voltage electricity needs attention to electrostatic shielding of a circuit, a 12V stepping motor pushes a solution to be extruded out of a spinning device, once the motor is influenced by high voltage, the motor is instantaneously punctured by high voltage to cause irreversible damage, and therefore the motor is far away from a melt with high voltage electricity. The two syringes of the device are separated from the motor by a non-conductive plastic plate, which is typically selected to be thicker to prevent deformation under force. The polytetrafluoroethylene material has the advantages of good stability, high temperature resistance, good toughness and hardness, easiness in processing and the like, is usually applied to mechanical parts, and can effectively isolate high pressure by using the material as a component of a sliding block of a propeller. Then the periphery of the propulsion device is wrapped by aluminum foil paper or a metal plate, and then the propulsion device is connected with a ground wire by a lead, so that double electrostatic shielding is achieved. The plastic board is used for isolating the motor from the affected environment, which belongs to the common means of motor protection and is not repeated here.

The spinning needle head integrally comprises the following parts: the syringe needle pearl head, the pearl head advancing device, the syringe needle goes out the liquid hole, replenishes four parts of liquid channel. As can be appreciated by those skilled in the art, the whole end of the spinning needle is approximately hemispherical with a larger diameter than the needle bead head, and the needle bead head is arranged inside the spinning needle. The piston is arranged in the tube wall and is fixedly connected with the needle head bead head through a rod piece which is fixedly connected with the piston. The tube wall is provided with a fluid infusion channel at the middle position of the piston and the needle fluid outlet hole. The spinning needle head is designed to adjust the gap between the needle head bead head and the liquid outlet hole according to requirements so as to achieve the purpose of adjusting the electrostatic spinning speed. The bead head propelling device can correspondingly adjust the position of the bead head, change the size of a gap between the bead head of the needle head and the liquid outlet hole, for example, when a spinning experiment is carried out by using a spinning solution with relatively high viscosity, in order to ensure that the spinning solution does not obstruct at the liquid outlet hole or can carry out more spinning operations more quickly in the spinning process, the bead head propelling device can be adjusted, the propelling device is properly adjusted to move backwards, and the gap between the bead head of the needle head and the liquid outlet hole is enlarged, so that the expected effect is achieved; in the normal spinning process, the function of the bead head propelling device is also shown in that the spinning speed and the spinning amount can be adjusted according to the actual conditions, and due to different properties of different spinning solutions, the advancing or retreating of the bead head propelling device in the spinning process needs to be tested and researched according to the actual conditions. As shown in fig. 2-3, the liquid supplementing channel is connected to the liquid feeding and discharging device to achieve the purpose of continuous electrostatic spinning.

Preferably, the ball head propelling device mainly adopts a combination of a ball screw and a servo motor, the motor controls the rotation of the ball screw, and the ball screw is sleeved with a nut. The nut is fixedly connected with the piston. Making it more accurate when adjusting needle advancement. The bead head propelling device can also be other devices which are commonly used in the mechanical field and realize linear repeated motion. In addition, the person skilled in the art can envisage: the material of the connection part of the bead head propelling device and the needle head bead head is made of insulating material, because high voltage is applied to the needle head in the electrostatic spinning process, the connection part can enable the whole electrostatic spinning device to be disconnected from the applied high-voltage electric field by using the insulating material, and the safety of a user is ensured in the electrostatic spinning process.

A CCD high-speed camera is additionally arranged right above the electrostatic spinning needle head, and a control system is used as a core component for information processing and control instruction generation and can be realized by a computer. The high-speed camera monitors the forming state of the Taylor cone and the number of the Taylor cones in the spinning process, observes the number of the Taylor cones in the spinning process at different advancing speeds, and is arranged above the electrostatic spinning needle head, so that the spinning quantity (filament quantity) ejected in the electrostatic spinning process can be accurately shot, the spinning quantity of different materials and different advancing speeds is recorded, and the advancing speed of different spinning solutions when the electrostatic spinning quantity is maximized is obtained according to data.

The invention has the beneficial effects that: the traditional liquid supply mode is improved, the spinning time is greatly reduced, the continuous injector is used for replacing the traditional common injector to extrude the solution, the continuous injector is matched with the designed continuous injector track for use, the high-voltage electrostatic spinning with unlimited and controllable supply and discharge liquid is successfully realized through the control of an operating platform and a motor, the innovative bullet spinning needle head is adopted, and the speed is increased by hundreds of times compared with the speed of the traditional single-needle spinning equipment.

While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.

Claims

1. An electrostatic spinning device for continuously supplying liquid and discharge liquid is characterized by comprising: a propelling device for communicating the three-way pipe (7) with the electrospinning solution bottle (11);

the output end of the three-way pipe (7) is connected with a spinning needle head;

the spinning needle head comprises: the device comprises a needle bead head (91), a piston arranged in the tube wall of the spinning needle head, and a bead head propelling device (93) connected with the piston;

the piston is connected with the needle head bead head (91), a needle liquid outlet hole (94) is formed in the tail end of the tube wall, and the bead head propelling device (93) controls the movement position of the needle head bead head (91);

a cavity formed between the piston and the tail end of the pipe wall is provided with a liquid supplementing channel (95) which can be communicated with the output end of the three-way pipe (7);

the electrospinning solution bottle (11) is provided with a first output end (61) and a second output end (62);

the outlet, the second output end (62) and the second input end (72) of the second injector (52) are commonly connected with and controlled by a second check valve group (102); the outlet, the first output end (61) and the first input end (71) of the first injector (51) are connected with and controlled by a first check valve group (101) together;

the propulsion device comprises: a single screw pair movement mechanism supporting a base platform (14) of the propulsion device, controlling the movement of the first syringe (51) and the second syringe (52) simultaneously;

the single-screw pair motion mechanism comprises: the screw rod (13) is driven by the motor (1), and the screw rod sliding block (4) is movably sleeved outside the screw rod (13) through threads;

the lower part of the screw rod sliding block (4) is connected with a needle cylinder of the first injector (51), and the upper part of the screw rod sliding block (4) is connected with a piston of the second injector (52).

2. The electrospinning device for continuously supplying liquid outlet according to claim 1, wherein the propelling device further comprises limit switches at corresponding positions on both sides of the screw rod (13) for limiting the moving distance of the screw rod slider (4).

3. The electrospinning device for continuously supplying liquid outlet according to claim 1, wherein the propelling device further comprises a control system, the control system comprises a single chip microcomputer, a liquid crystal display screen and a user interaction operation panel, and the single chip microcomputer controls the motor to operate.

4. The electrospinning device capable of continuously supplying liquid outlet according to claim 3, wherein the single chip microcomputer is STC8A8K64S4A 2.

5. Electrospinning device for continuously supplying a liquid according to claim 1, characterized in that a plastic plate is fixedly attached to the base platform (14) to separate the motor (1) from the first injector (51) and the second injector (52).

6. The electrospinning device for continuously supplying liquid outlet according to claim 1, wherein the electrospinning device is further provided with an observation device which comprises a control device and a CCD high-speed camera arranged right above the spinning needle head.