Electrostatic spinning device

Abstract

The invention discloses an electrostatic spinning device, and relates to the technical field of electrostatic spinning, the electrostatic spinning device comprises a liquid supply cylinder, one end of the liquid supply cylinder is rotatably provided with a fixed disc, the outer end surface of the fixed disc is provided with a needle cylinder, the end part of the needle cylinder is provided with a needle head, two ends in the liquid supply cylinder are provided with pistons, and a flow guide pipe is slidably arranged in the liquid supply cylinder along the axial direction; a reset piece is arranged between the flow guide pipe and the liquid supply cylinder, a first communicating hole is formed in the flow guide pipe, second communicating holes are correspondingly formed in the needle cylinders, pressure relief holes corresponding to the first communicating holes are further formed in the needle cylinders, and a limiting piece for limiting rotation of the fixing disc is arranged on the flow guide pipe. The needle cylinder can rotate under the action of pressure and gravity when in a blocked state, so that the purpose of switching the needle cylinder is achieved, detection is not needed, automatic adjustment and switching can be achieved automatically according to pressure changes, full-automatic operation is achieved, the time for replacing blocking is effectively shortened, shutdown is not needed for automatic switching, rapid switching can be achieved, and influences are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of electrostatic spinning, in particular to an electrostatic spinning device. Background Art

[0002] Electrospinning is a special form of electrostatic atomization of polymer fluids. The substances split by the atomization are not tiny droplets, but tiny polymer jets that can run for a considerable distance and eventually solidify into fibers.

[0003] Electrospinning devices are not only used in the textile industry, but also play a huge role in the fields of biomedical materials, filtration and protection, catalysis, energy, optoelectronics, food engineering, cosmetics, etc. For example, in food engineering, the freshness of meat products is determined by spinning into a film, and then the freshness is determined by testing the film. However, the needle of the electrospinning device has a defect that it will be blocked. Once the needle is blocked, the detection process will be interrupted. It is necessary to stop the advancement of the mixed liquid and remove the needle for replacement or cleaning and then install it again, which greatly affects the efficiency of the detection. Moreover, because the entire equipment is stopped, if the two processes are carried out continuously, it may cause micro changes in the detection parameters, such as the evaporation of the solvent in the spinning solution on the receiving base and the evaporation of the solvent in the syringe during the needle replacement, which will affect the morphology and performance of the fiber membrane produced by spinning. To this end, we propose an electrospinning device. Summary of the invention

[0004] The object of the present invention is to provide an electrospinning device to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an electrostatic spinning device, comprising a liquid supply cylinder, a fixed disk is rotatably mounted on one end of the liquid supply cylinder, at least two groups of syringes are arranged uniformly in a circumferential array on the outer end surface of the fixed disk, the axes of the syringes are not colinear with the axes of the liquid supply cylinder but intersect, needles are installed at the ends of the syringes, one of the syringes is a working syringe, a receiving base is arranged on the axis of the working syringe, pistons are arranged at both ends of the liquid supply cylinder, and the liquid supply cylinder is located at one end of the fixed disk, and a hollow guide tube with one end open and non-rotatable is axially slidably provided, and one of the pistons is fixedly mounted at the end of the guide tube. The guide tube has one end extending into the intersection area of ​​each syringe, and a reset member for generating resistance to the sliding of the guide tube toward one end of the fixed disk is provided between the guide tube and the liquid supply cylinder. A connecting hole 1 is provided on the circumferential surface of one end of the guide tube located in the intersection area of ​​the syringes, and a corresponding connecting hole 2 is provided in the syringe, and a pressure relief hole corresponding to the connecting hole 1 is also provided in the syringe, and the pressure relief hole and the connecting hole 2 are staggered in the axial and circumferential directions of the guide tube, and a limiting member for limiting the rotation of the fixed disk is provided on the guide tube, and the limiting member releases the limit after the guide tube moves outward along the axial direction, and the initial state is that the connecting hole 1 is connected to the connecting hole 2.

[0006] Preferably, the syringes are provided in two groups, and the axes of the two groups of syringes are coplanar with the axis of the flow guide tube.

[0007] Preferably, the angle between the perpendicular line from the center of gravity of the syringe to the axis of the guide tube and the vertical direction is 3-8°, and the syringe is provided with a counterweight, which makes the perpendicular line from the center of gravity of the syringe to the axis of the guide tube deviate from the vertical direction.

[0008] Preferably, there is only one group of pressure relief holes on a single syringe.

[0009] Preferably, a damping structure for smoothing the rotation of the fixed disk is provided between the fixed disk and the liquid supply cylinder.

[0010] Preferably, a container is provided below the fixed disk, and a dissolving agent is contained in the container. When the fixed disk rotates, the blocked needle rotates into the container and is cleared by the action of the dissolving agent.

[0011] Preferably, the cross-sections of the connecting hole 1 and the connecting hole 2 are both trapezoidal, and the cross-sections of the two when connected are also trapezoidal and continuous, with the diameter decreasing from the connecting hole 1 to the connecting hole 2.

[0012] Preferably, two groups of pressure relief holes are provided in a single syringe, and when the connecting hole 1 and the connecting hole 2 are connected, the two groups of pressure relief holes are located on both sides of the connecting hole 2.

[0013] Preferably, the reset element is a constant force spring.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The present invention provides multiple sets of syringes, which can rotate under pressure and gravity when in a blocked state, so as to achieve the purpose of switching syringes. No detection is required, and the syringes can be automatically adjusted and switched according to pressure changes. The fully automatic operation effectively reduces the time for replacing the blockage, and the automatic switching does not require shutdown, so fast switching can be achieved to reduce the impact.

[0016] The present invention does not require disassembly to replace the needle, that is, the internal mixture is still in a non-open state, so the switch will not cause the volatilization of the solvent, further reducing the impact on the fiber membrane;

[0017] The present invention arranges the rotation of the fixed disk, and the blocked needle after switching can enter the container to clear the blockage, thereby realizing the integration of switching and clearing the blockage, and the needle can be recycled. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 for Figure 1A side view schematic diagram of the structure;

[0020] Figure 3 It is a schematic diagram of the syringe structure along the axial direction of the liquid supply cylinder;

[0021] Figure 4 It is a schematic diagram of the overall half-section structure when the syringe is horizontal in the working state;

[0022] Figure 5 for Figure 4 A schematic diagram of the enlarged structure of region A;

[0023] Figure 6 It is a schematic diagram of the position structure of the pressure relief hole in the half-cut state of the syringe;

[0024] Figure 7 It is a schematic diagram of the radial cross-sectional structure of the pressure relief hole;

[0025] Figure 8 It is a schematic diagram of the cross-sectional structure when the connecting hole 1 and the connecting hole 2 are completely connected.

[0026] In the figure: 1-liquid supply cylinder; 2-fixed plate; 3-syringe; 301-connecting hole 2; 302-pressure relief hole; 4-receiving base; 5-piston; 6-guide tube; 601-connecting hole 1; 602-guide groove; 7-reset member; 8-counterweight; 9-container; 10-rotation damper; 11-first gear; 12-second gear; 13-limit pin; 14-limit column; 15-exhaust hole. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 The present invention provides a technical solution: an electrostatic spinning device, comprising a liquid supply cylinder 1, one end of the columnar liquid supply cylinder 1 is rotatably connected to a fixed disk 2 through a bearing, the fixed disk 2 is mainly used to store a mixed liquid, two groups of pistons 5 are axially slidably arranged in the liquid supply cylinder 1, the mixed liquid is located between the two groups of pistons 5, the piston 5 at one end away from the fixed disk 2 is the main piston 5, pushes and forces the mixed liquid into a syringe 3, and forms a Taylor cone at the needle tip through an electrostatic field, thereby spinning;

[0029] The fixed disk 2 is separated from the end surface of the liquid supply cylinder 1 and is integrally or detachably connected to the syringe 3. The syringe 3 is provided with at least two groups, which are evenly divided in the circumferential array along the fixed disk 2. It is preferably to set two or three groups of syringes 3. Two groups can be converted, and three groups can keep one spare during the conversion. The circumferential angle of two groups, i.e., two syringes 3, on the fixed disk 2 is 180°, while that of three groups is 120°. The following description is based on the case of two groups. A needle is installed at the end of each syringe 3, and an electrostatic field is set at the needle. The axis of each syringe 3 intersects with the axis of the liquid supply cylinder 1, i.e., there is a certain angle between the axes of the two. In this way, when the fixed disk 2 rotates, the needle at the end of each syringe 3 will change position and switch. One of the syringes 3 is a working syringe 3, and only the needle at the end of the syringe 3 is in a working state. Figure 4 As shown, the working needle cylinder 3 is preferably in a horizontal state, and a receiving base is provided at the axially extending end of the needle cylinder 3 for receiving the fiber bundle;

[0030] The guide tube 6 is coaxially arranged with the liquid supply cylinder 1, and one end of the guide tube 6 passes through the liquid supply cylinder 1 and extends to the intersection of each syringe 3 (the common area in the middle). The guide tube 6 is hollow inside and one end close to the piston 5 is open. A flange is arranged on the outer wall of the open end of the guide tube 6, and one of the pistons 5 is fixedly installed by the flange. The diameter of the flange is slightly smaller than the inner diameter of the liquid supply cylinder 1, and a reset member 7 is arranged between the flange and the end of the liquid supply cylinder 1. The reset member 7 mainly generates resistance to resist the hydraulic pressure of the mixed liquid under normal circumstances. Another function is to reset the guide tube 6, which will be described below. A connecting hole 1 601 is arranged on the circumferential outer diameter surface (non-end surface) of the non-open end of the guide tube 6, corresponding to the connecting hole 1 601, and a connecting hole 2 301 is arranged at the position of each syringe 3 corresponding to the connecting hole 1 601;

[0031] In the initial state, the connecting hole 2 301 of the working syringe 3 is docked with the connecting hole 1 601. Under the push of the main piston 5 (not installed on the guide tube 6), the mixed liquid enters the syringe 3 in the working position and forms a fiber bundle under the action of the electrostatic field and is received by the receiving base 4. After the syringe 3 is blocked, the piston 5 is still in a state of slow advancement. The hydraulic pressure of the mixed liquid increases, driving the piston 5 on the guide tube 6 and the guide tube 6 to move axially toward one end of the fixed disk 2. An exhaust hole 15 is provided at the intersection of each syringe 3 to prevent the end of the guide tube 6 from moving and squeezing the air, resulting in difficulty in movement. The reset member 7 is compressible, preferably a spring, and further selected as a constant force spring. During the movement of the guide tube 6, the area of ​​the connecting region between the connecting hole 1 601 and the connecting hole 2 301 is continuously reduced until it disappears completely. A limit column 14 is provided on the surface of the guide tube 6 along the axial direction, and an adaptive groove is provided in the corresponding fixed disk 2 or the intersection area of ​​each syringe 3, such as Figure 5As shown, a groove and a limiting column 14 are provided on the fixed disk 2 and can slide in the axial direction, and an annular avoidance is provided in the fixed disk 2 at the front side of the route where the limiting column 14 advances, so that after the guide tube 6 moves in the axial direction, the limiting column 14 is separated from the restriction of the groove adapted by the device, so that the fixed disk 2 can rotate freely, and the syringe 3 in the initial state of non-working is a cavity. Under the action of gravity, the syringe 3 corresponding to the needle blocked in the working state drives the fixed disk 2 to rotate, and a limiting pin 13 is provided in the liquid supply cylinder 1, and a guide groove 602 adapted to the limiting pin 13 is provided on the outer surface of the guide tube 6 to prevent the guide tube 6 from rotating;

[0032] The pressure relief hole 302 is provided in the syringe 3 and is interlaced with the second communication hole 301. Figure 6 and Figure 7 As shown, while the guide tube 6 is misaligned in the circumferential direction, it is also misaligned in the axial direction. Due to the overall symmetry, the rotation direction of the fixed disk 2 is uncertain. There are at least two pressure relief holes 302 on the single syringe 3, and the two are respectively located at the forward positions of the two rotation directions of the fixed disk 2 in the clockwise or counterclockwise direction. That is, after the guide tube 6 moves axially to separate the connecting hole 1 601 and the connecting hole 2 301, the fixed disk 2 rotates under the action of gravity (it rotates because it is top-heavy). After the rotation, the connecting hole 1 601 contacts the pressure relief hole 302, and the mixed liquid enters the other In a syringe 3 to be worked, because the pressure decreases, under the elastic force of the reset member 7, the guide tube 6 moves the reset part axially (it cannot be completely reset due to the limit of the limit column 14), but at this time the connecting hole 601 is separated from the pressure relief hole 302 on the syringe 3 to be worked and no longer releases pressure, and because there is no restriction, the fixed disk 2 is allowed to rotate under the action of gravity until the slot corresponding to the limit column 14 reaches the position of the limit column 14, and is completely reset under the action of the reset member 7, that is, a complete switching process is completed, and the needle in the blocked working state and the needle in the working state are exchanged.

[0033] See Figure Figure 4 and Figure 6 Two groups of syringes 3 are arranged, and both groups of syringes 3 are based on the intersection with the axis of the guide tube 6 and deflected radially outward to generate an angle. This arrangement better determines the axial direction of the syringe 3.

[0034] See also Figure 1 and Figure 6 On the basis of symmetrically setting the pressure relief holes 302, because the syringe 3 and the fixed disk 2 are symmetrical structures, there is a critical situation, that is, after the syringe 3 in the working state is blocked by the needle, because it is just in the center position and can remain stable, even if it is heavy on the top and light on the bottom, it cannot drive the fixed disk 2 to rotate, so it is necessary to generate an asymmetric structure to avoid this critical state;

[0035] The mass difference generated by only one pressure relief hole 302 has little effect on the overall mass eccentricity, so a counterweight 8 is provided, and the counterweight 8 makes the single syringe 3 have an angle with the vertical direction, that is, along the axial projection of the liquid supply cylinder 1, the angle between the axis of the syringe 3 and the vertical direction is as follows: Figure 1 The angle α shown is that only when there is a deviation angle, the fixed plate 2 and the structure thereon will not be located at the critical point and will not rotate. The angle α produced by the counterweight 8 is preferably 3 to 8°, such as 3, 4, 5, 6, 7 and 8°, preferably 5°.

[0036] In the above eccentric state, the fixed disk 2 is equivalent to a directional movement, so only one pressure relief hole 302 may be provided on a single syringe 3.

[0037] See also Figure 1 and Figure 3 , the rotation of the fixed plate 2 under the action of gravity has an acceleration process, and when reaching the bottom position, if there is no limit, it will swing back and forth, but under the action of the limit, it will stop suddenly, causing a vibration to the entire device. Therefore, in order to reduce the impact of the rotation, a damping structure is set to make the rotation of the fixed plate 2 relatively smooth and uniform;

[0038] Specifically, a first gear 11 is fixedly mounted on the outer diameter surface of the fixed disk 2, a rotary damper 10 is fixedly mounted on the outer surface of the liquid supply cylinder 1, and a second gear 12 meshing with the first gear 11 is mounted on the rotating shaft of the rotary damper 10, and the rotary damper 10 is acted on through the meshing transmission of the two gears.

[0039] like Figure 2 As shown, when the working syringe 3 is in working state, the other syringe 3 in non-working state is immersed in the container 9 below the end of the liquid supply cylinder 1. The container 9 contains a solvent to dissolve and clean the blockage, thereby realizing the function of automatic blockage clearing;

[0040] Furthermore, a structure for clearing blockage may be provided in the container 9, and the structure may adopt the existing technology, so it will not be described in detail.

[0041] See also Figure 8 The cross-sections of both the connecting hole 1 601 and the connecting hole 2 301 are trapezoidal, and preferably are isosceles trapezoidal. The cross-sections of the two in the connected state are also isosceles trapezoidal, that is, both are trumpet-shaped holes. The main function of this method is that when the two are not in a fully docked state, the mixed liquid flowing in exerts a force on the inclined surface of the hole, driving the two to reach a fully docked state.

[0042] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electrospinning device, comprising a liquid supply cylinder (1), characterized in that: A fixed disk (2) is rotatably mounted on one end of the liquid supply cylinder (1), and at least two groups of syringes (3) are evenly arranged along the circumference of the outer end surface of the fixed disk (2). The axes of the syringes (3) are not colinear with the axis of the liquid supply cylinder (1) but intersect with each other. A needle is installed at the end of the syringe (3), and one of the syringes (3) is a working syringe (3). A receiving base (4) is arranged on the axis of the working syringe (3). Pistons (5) are arranged at both ends of the liquid supply cylinder (1), and a hollow flow guide tube (6) with one end open and non-rotatable is axially slidably arranged inside the liquid supply cylinder (1) at one end of the fixed disk (2), and one piston (5) is fixedly mounted on the end of the flow guide tube (6), and one end of the flow guide tube (6) extends to the intersection area of ​​each syringe (3). The flow guide tube ( A reset member (7) is also provided between the guide tube (6) and the liquid supply cylinder (1) to generate resistance to the sliding of the guide tube (6) toward one end of the fixed disk (2); a connecting hole (601) is provided on the circumferential surface of one end of the guide tube (6) located in the intersection area of ​​the syringe (3), and a corresponding connecting hole (301) is provided in the syringe (3); a pressure relief hole (302) corresponding to the connecting hole (601) is also provided in the syringe (3); the pressure relief hole (302) and the connecting hole (301) are staggered in the axial and circumferential directions of the guide tube (6); a limiting member is provided on the guide tube (6) to limit the rotation of the fixed disk (2); the limiting member is released after the guide tube (6) moves outward along the axial direction; and the initial state is a state in which the connecting hole (601) is connected to the connecting hole (301).

2. An electrospinning device according to claim 1, characterized in that: The needle barrels (3) are provided in two groups, and the axes of the two groups of needle barrels (3) are coplanar with the axis of the flow guide tube (6).

3. An electrospinning device according to claim 1 or 2, characterized in that: The angle between the perpendicular line from the center of gravity of the syringe (3) to the axis of the guide tube (6) and the vertical direction is 3 to 8 degrees, and the syringe (3) is provided with a counterweight (8), and the counterweight (8) makes the perpendicular line from the center of gravity of the syringe (3) to the axis of the guide tube (6) deviate from the vertical direction.

4. An electrospinning device according to claim 3, characterized in that: There is only one group of pressure relief holes (302) on a single syringe (3).

5. An electrospinning device according to claim 1 or 2, characterized in that: A damping structure for smoothing the rotation of the fixed disk (2) is provided between the fixed disk (2) and the liquid supply cylinder (1).

6. An electrospinning device according to claim 1 or 2, characterized in that: A container (9) is provided below the fixed disk (2), and a dissolving agent is carried in the container (9). When the fixed disk (2) rotates, the blocked needle rotates into the container (9) and is cleared under the action of the dissolving agent.

7. An electrospinning device according to claim 1 or 2, characterized in that: The cross-sections of the connecting hole 1 (601) and the connecting hole 2 (301) are both trapezoidal, and the cross-sections of the two when connected are also trapezoidal and continuous, with the diameter decreasing from the connecting hole 1 (601) to the connecting hole 2 (301).

8. An electrospinning device according to claim 2, characterized in that: Two groups of pressure relief holes (302) are provided in a single syringe (3), and when the first connecting hole (601) and the second connecting hole (301) are in a connected state, the two groups of pressure relief holes (302) are located on both sides of the second connecting hole (301).

9. An electrospinning device according to claim 1, characterized in that: The reset element (7) is a constant force spring.

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