Device for preparing nanofiber membrane through electrostatic spinning

Abstract

The invention belongs to the technical field of nanofiber membranes, and particularly relates to a device for preparing a nanofiber membrane through electrostatic spinning. An injection tube; a spinning needle; the feeding pipe is provided with a one-way valve; the propelling mechanism is used for propelling the injection tube to spray the solvent; the roller is matched with the spinning needle head; a shaft of the motor is fixedly connected with the roller, and the motor is matched with the box body; the high-voltage power supply is fixedly connected with the box body, the high-voltage power supply is electrically connected with the roller, and the high-voltage power supply is electrically connected with the spinning needle head; the motor, the high-voltage power supply and the propelling mechanism are electrically connected with the controller; the rotating column is fixedly connected with the box body, and the injection tube is rotationally connected with the rotating column; the supporting mechanism is used for supporting the injection tube, the supporting mechanism is fixedly connected with the box body, and the supporting mechanism is matched with the injection tube. The problem that the angle of the injection tube cannot be adjusted is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of nanofiber membrane preparation, and in particular relates to a device for preparing nanofiber membrane by electrostatic spinning. Background Art

[0002] With the development of technology, electrospinning has been widely used in recent years. Electrospinning is a special form of electrostatic atomization of polymer fluids and a special fiber manufacturing process. Under the action of a high-voltage electric field, the polymer solvent droplets change from spherical to conical, and extend from the tip of the cone to obtain fiber filaments, which are finally solidified into fibers. This process can produce filaments with nanometer diameters and form them on the substrate of the receiving electrode to form filter materials.

[0003] At present, the existing patent announcement number is CN115305583A, which is a kind of melt electrostatic spinning equipment, including a spinning cabin, an isolation cover is movably installed at the front end of the spinning cabin, a control panel is also provided at the front end of the spinning cabin, a feed pipe is connected to the top of the spinning cabin, and also includes: a support platform, the support platform is fixedly installed on the bottom wall in the spinning cabin, a collecting roller is rotatably installed on the support platform, and one end of the collecting roller is electrically connected to the power supply. This invention sets a feeding mechanism, after pulling the piston in the opposite direction, under the action of air pressure, the molten spinning material in the feed pipe can push the second flap to be sucked into the injection tube through the connecting pipe, at this time, the first flap can block the conduit under the action of air pressure and the limit plate, and by driving the piston to move, the discharge and addition of the molten spinning material can be controlled, which can save the user's feeding time, reduce the operation process, and further improve production efficiency. It is simple to operate and convenient to use.

[0004] However, there is also a problem: the injection tube of this solution is fixed on the mounting frame and the angle cannot be adjusted. The existing injection tube is detachably fixed on the mounting frame. When it is necessary to exhaust air and remove static electricity on the injection tube, the operator needs to frequently open the hatch to adjust the position of the injection tube, which lacks flexibility. Summary of the invention

[0005] This solution provides a device for preparing nanofiber membranes by electrospinning, which is used to solve the problem that the angle of the injection tube cannot be adjusted.

[0006] The present invention provides a device for preparing nanofiber membrane by electrospinning, comprising a housing; an injection tube: the injection tube is matched with the housing; a spinning needle: the spinning needle is connected with the injection tube; a feeding tube: the feeding tube is connected with the injection tube, and the feeding tube is provided with a one-way valve; a propulsion mechanism: the propulsion mechanism is used to push the injection tube to spray solvent; a roller: the roller is rotatably connected with the housing, and the roller is matched with the spinning needle; a motor: the shaft of the motor is fixedly connected with the roller, and the motor is matched with the housing; a high-voltage power supply: the high-voltage power supply is fixedly connected with the housing, the high-voltage power supply is electrically connected with the roller, and the high-voltage power supply is electrically connected with the spinning needle; a controller: the motor, the high-voltage power supply and the propulsion mechanism are all electrically connected with the controller; a rotating column: the rotating column is fixedly connected with the housing, and the injection tube is rotatably connected with the rotating column; a supporting mechanism: the supporting mechanism is used to support the injection tube, the supporting mechanism is fixedly connected with the housing, and the supporting mechanism is matched with the injection tube.

[0007] The principle of this scheme is that the operator starts the motor through the controller to make the roller rotate at a constant speed, then the operator adds a certain amount of solvent from the feed pipe, then the operator adjusts the angle of the injection tube so that the injection tube is not aligned with the roller first, then the operator starts the propulsion mechanism to exhaust, stops the propulsion mechanism when solvent is ejected, then adjusts the angle of the injection tube so that the injection tube is aligned parallel to the roller, and then uses the support mechanism to support the injection tube to prevent the injection tube from rotating.

[0008] The operator closes the box door, controls the controller to turn on the high-voltage power supply, and then starts the propulsion mechanism to continue propulsion. Under the action of high-voltage static electricity, the droplets change from spherical to conical, and extend from the tip of the cone to obtain fiber filaments, which are finally solidified into fiber membranes on the roller.

[0009] The beneficial effect of this solution is that the injection tube can be adjusted to a set position during setting, and when exhaust is required, the injection tube can be misaligned with the roller to prevent the solvent from being sprayed onto the roller and affecting the flatness of the roller.

[0010] Furthermore, the propulsion mechanism includes a hydraulic pump and a piston block, the hydraulic pump is connected to the injection tube through a hose, the hose cooperates with the piston block, the hydraulic pump is fixedly connected to the box, the hydraulic pump is electrically connected to the controller, and the piston block is sealed and slidably connected to the injection tube.

[0011] The controller starts the hydraulic pump, and the hydraulic pump pumps hydraulic oil into the hydraulic cylinder, so that the hydraulic oil enters the injection tube, and the hydraulic oil drives the piston block to move, and the piston block moves forward, so that the material is ejected from the spinning needle. This solution uses hydraulic pressure to push the piston block to spray the material at a uniform speed, so that the injection speed is stable.

[0012] Furthermore, the piston block is a gravity piston block, the supporting mechanism includes a fixed plate, a rotating plate and a torque spring, the fixed plate is fixedly connected to the box body, the rotating plate is rotationally connected to the fixed plate through the torque spring, and the rotating plate cooperates with the injection tube.

[0013] The mass of the gravity piston block is much larger than the mass of the material. Due to the existence of the rotating column, when the gravity piston block is on the left, the right side of the injection tube tilts up. When the hydraulic pump starts to drive the piston block to the right, it needs to be emptied at this time. The injection tube tilts up, causing the exhaust air and excess solvent to drip into other positions to prevent dripping onto the roller. After reaching the set position, the emptying ends, and the injection tube will deviate, causing the left side to tilt up. At this time, the injection tube will contact the rotating plate, which supports the injection tube under the action of the torque spring, so that the injection tube remains horizontal and aligned with the roller. At this time, the controller will start the high-voltage power supply and start electrospinning.

[0014] When the gravity piston block reaches the set position on the right, the material in the injection tube is consumed to the set value, and the torque force of the gravity piston block exceeds the force of the torque spring. The rotating plate rotates, causing the right side of the injection tube to fall. At the same time, the controller stops the high-voltage power supply and the hydraulic pump to complete the electrospinning.

[0015] This mechanism changes the position of the injection tube by the position of the gravity piston block, so that the injection tube is aligned with the roller during electrospinning and is aligned with other places during emptying. This mechanism reduces the problem of a small part of the solvent being ejected onto the roller when the injection tube is emptied, and improves the quality of electrospinning.

[0016] Furthermore, it also includes a limit block, two of which are provided, and the limit block is used to limit the rotation angle of the injection tube, and the limit block is fixedly connected to the box body. The limit block can ensure the angle of the injection tube in several positions.

[0017] Furthermore, it also includes a grounding rod, which is fixedly connected to the box body and cooperates with the spinning needle. After each electrostatic spinning is completed and the high-voltage power supply is turned off, the spinning needle will still have static electricity. When the operator is spinning, he may touch the spinning needle with his hand and be electrocuted by static electricity. When the gravity piston block of this mechanism comes to the set position on the right, the operator controls the high-voltage power supply to turn off. Under the action of the gravity piston block, the injection tube presses over the rotating plate and moves downward. Finally, the spinning needle will contact the grounding rod to ground the static electricity on the spinning needle. This mechanism solves the static electricity problem so that the operator will not be electrocuted by static electricity.

[0018] Furthermore, it also includes a push switch, which is fixedly connected to the fixed plate, and the push switch cooperates with the rotating plate, and the push switch is electrically connected to the controller. When the injection tube causes the rotating plate to flip under the action of the gravity piston block, the rotating plate will rotate and press the push switch on the fixed plate, and the push switch sends an electrical signal to the controller, and the controller controls the high-voltage power supply and the hydraulic pump to stop working. This mechanism realizes the automation of stopping operation through the push switch.

[0019] Furthermore, it also includes a uniform mechanism, which includes a support frame, a connecting rod, an air pump, a piston plate and a cylinder body, the connecting rod is fixedly connected to the roller coaxially, the support frame is rotatably connected to the connecting rod, the piston plate is fixedly connected to the motor, the cylinder body is fixedly connected to the box body, the piston plate is sealingly and slidably connected to the cylinder body, the air pump is communicated with the cylinder body, and the air pump is fixedly connected to the box body, and the air pump is electrically connected to the controller.

[0020] During spinning, the injection tube is always electrostatically spinning at one place of the roller, which easily causes the spinning line to accumulate in the center of the roller, resulting in uneven fiber film thickness, and excessive fiber accumulation may cause the fibers to entangle together, forming lumps, affecting the quality of the fiber film. The motor of this mechanism controls the rotation of the connecting rod, and the connecting rod makes the roller rotate. At the same time, the air pump will ventilate and extract air into the cylinder, causing the piston plate to move left and right, the piston plate drives the motor to move left and right, the motor drives the connecting rod to move left and right, and the connecting rod drives the roller to move left and right, so that the roller can move left and right while rotating.

[0021] This mechanism uses a moving roller to allow the injection tube to be evenly injected into each position of the roller, ensuring uniform thickness of the fiber film. The existing method is to move the injection tube, while this scheme uses a moving roller. Moving the injection tube easily causes the injection tube to deviate, and the movement of the injection tube causes the spinning needle to be subjected to lateral force, which easily causes the needle to fall off. Moving the roller will not have the above problems.

[0022] Furthermore, it also includes a collecting box, which is fixedly connected to the box body and cooperates with the spinning needle. When the injection tube is emptied, the injection tube will tilt up on the right side due to the action of the gravity piston block, so that the spinning needle is just aligned with the collecting box. When emptying, a small amount of solvent will be sprayed out, and the solvent will enter the collecting box at this time to prevent the solvent from contaminating the box body. At the same time, the collected solvent can also be recycled.

[0023] Furthermore, it also includes a humidity detection mechanism and a temperature lamp, wherein the humidity detection mechanism is used to detect the humidity inside the box, and the humidity detection mechanism is fixedly connected to the box, the temperature lamp is fixedly connected to the box, and the temperature lamp is electrically connected to the controller. Excessive humidity inside the box can easily cause the current of the high-voltage power supply to shock the instrument inside the box, causing the instrument to fail. This mechanism detects the humidity inside the box through the humidity detection mechanism. When the humidity reaches the set value, the controller controls the temperature lamp to turn on, evaporate the water, and reduce the humidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a state diagram of an electrospinning device for preparing nanofiber membranes during electrospinning. Figure 2 This is a state diagram of an electrospinning device for preparing nanofiber membranes when it is empty. Figure 3 This is a grounding state diagram of a device for preparing nanofiber membranes by electrospinning. Figure 4 This is a structural diagram of the roller uniform mechanism of an electrospinning device for preparing nanofiber membranes. Figure 5 This is a structural diagram of the support mechanism of a device for preparing nanofiber membranes by electrospinning.

[0025] The figures in the specification include: 1. box body; 2. high-voltage power supply; 3. injection tube; 4. electric chuck; 5. roller; 6. collection box; 7. spinning needle; 8. support frame; 9. hydraulic pump; 10. gravity piston block; 11. feed pipe; 12. limit block; 13. rotating column; 14. supporting mechanism; 15. grounding rod; 16. piston plate; 17. motor; 18. cylinder body; 19. air pump; 20. connecting rod; 21. fixed plate; 22. rotating plate; 23. torque spring; 24. push switch. DETAILED DESCRIPTION

[0026] Basically Figure 1 As shown: The present invention provides a device for preparing nanofiber membrane by electrospinning, comprising a box 1, which is a rectangular box 1 and is provided with an exhaust port, and a filter screen for preventing dust is provided at the exhaust port. A humidity detection mechanism is arranged on the inner side of the box 1, and the humidity detection mechanism is close to the roller 5. A high-voltage power supply 2 is fixed to the top surface of the inner part of the box 1, and the positive electrode of the high-voltage power supply 2 is connected to an electric chuck 4 through an electric wire, and the positive electrode electric chuck 4 clamps the spinning needle 7, and the negative electrode is electrically connected to the roller 5 through a rotating joint.

[0027] The rotating column 13 is fixed at the bottom of the box body 1, and the rotating column 13 is rotatably connected to the middle of the injection tube 3. The spinning needle 7 is connected to the injection tube 3. The injection tube 3 is provided with a gravity piston block 10 in a sliding seal. The hydraulic cylinder is fixed in the box body 1, and the push rod of the hydraulic cylinder is fixedly connected to the gravity piston block 10. The power of the hydraulic cylinder comes from the hydraulic pump 9, which is fixed in the box body 1 and connected to the left end of the injection tube 3.

[0028] Two limit blocks 12 are provided above and below the injection tube 3, and the limit blocks 12 are fixed on the box body 1. The limit blocks 12 limit the rotation angle of the injection tube 3. A grounding rod 15 is provided below the spinning needle 7, and the grounding rod 15 is fixedly connected to the box body 1 and connected to the ground. A collecting box 6 is provided on the upper right of the spinning needle 7, and the collecting box 6 is fixedly connected to the box body 1.

[0029] As attached Figure 1 , Figure 4 As shown: It also includes a uniform mechanism, which includes a support frame 8, a connecting rod 20, an air pump 19, a piston plate 16 and a cylinder body 18. The connecting rod 20 is fixedly connected to the roller 5 coaxially, the support frame 8 is rotatably connected to the connecting rod 20, the piston plate 16 is fixedly connected to the motor 17, the cylinder body 18 is fixedly connected to the box body 1, the piston plate 16 is sealingly and slidably connected to the cylinder body 18, the air pump 19 is communicated with the cylinder body 18, and the air pump 19 is fixedly connected to the box body 1, and the air pump 19 is electrically connected to the controller.

[0030] As attached Figure 1 , Figure 5 As shown: The support mechanism 14 includes a fixed plate 21, a rotating plate 22, a push switch 24 and a torque spring 23. The fixed plate 21 is fixedly connected to the box body 1, and the rotating plate 22 is rotationally connected to the fixed plate 21 through the torque spring 23. The push switch 24 is fixedly connected to the fixed plate 21, and the push switch 24 cooperates with the rotating plate 22. The support mechanism 14 is located at the right end of the injection tube 3 as a whole, and the injection tube 3 just touches the rotating plate 22 of the support mechanism 14 when it is horizontal. The push switch 24 is electrically connected to the controller. When the injection tube 3 turns over the rotating plate 22 under the action of the gravity piston block 10, the rotating plate 22 will rotate and press the push switch 24 on the fixed plate 21. The push switch 24 sends an electrical signal to the controller, and the controller controls the high-voltage power supply 2 and the hydraulic pump 9 to stop working. This mechanism realizes the automation of stopping operation by pressing the switch 24.

[0031] As attached Figure 1-5 As shown: The principle of this scheme is that the operator starts the motor 17 through the controller to make the roller 5 rotate at a constant speed, and then the operator adds a quantitative solvent from the feed pipe 11 to make the gravity piston block 10 move to the far left. Then, since the injection tube 3 is set on the rotating column 13, when the gravity piston block 10 is located on the left, the right side of the injection tube 3 is tilted, so that the injection tube is not aligned with the roller 5 at first, and the spinning needle 7 is aligned with the collection box 6. Then the controller controls the hydraulic pump 9 to start, and the hydraulic pump 9 pumps hydraulic oil into the hydraulic cylinder to drive the gravity piston block 10 to move, and the gravity piston block 10 moves forward to exhaust. When the gravity piston block 10 reaches a completely exhausted state, as shown in FIG. Figure 1 position, the injection tube 3 will rotate, causing the right side to drop. At this time, the injection tube 3 will contact the rotating plate 22. The rotating plate 22 supports the injection tube 3 under the action of the torque spring 23, so that the injection tube 3 remains horizontal. At this time, the controller will start the high-voltage power supply 2 and start electrospinning.

[0032] When the gravity piston block 10 reaches the set position on the right, the material in the injection tube 3 is also consumed to the set value, that is, when it reaches the rightmost end of the injection tube 3, due to the lever principle, the torque force of the gravity piston block 10 also exceeds the torque force of the torque spring 23, and the rotating plate 22 rotates, causing the right side of the injection tube 3 to fall. When the injection tube 3 turns over the rotating plate 22 under the action of the gravity piston block 10, the rotating plate 22 will rotate and press the press switch 24 on the fixed plate 21. The press switch 24 sends an electrical signal to the controller, and the controller controls the high-voltage power supply 2 and the hydraulic pump 9 to stop working, completing the electrostatic spinning. At the same time, the spinning needle 7 will contact the grounding rod 15 to ground the static electricity on the spinning needle 7. This mechanism solves the static electricity problem so that the operator will not be electrocuted by static electricity.

[0033] The gravity piston block 10, the syringe 3, the solvent, the hydraulic oil, the connecting pipe between the hydraulic pump and the syringe 3, and the electric chuck 4 in this solution will all affect the rotation of the syringe 3. Personnel in the art can make adjustments through multiple experiments so that after the syringe 3 has exhausted the air, the weight of the gravity piston block 10 will cause the syringe to fall on the rotating plate 22. At the same time, when the gravity piston block 10 moves to the rightmost end, due to the lever principle, the torque force of the gravity piston block 10 also exceeds the force of the torque spring 23, causing the rotating plate 22 to rotate and the syringe 3 to contact the grounding rod 15.

[0034] The beneficial effects of this solution are: 1. This solution can freely adjust the angle of the injection tube. When exhaust is required, the injection tube can be misaligned with the roller 5 to prevent the solvent from being sprayed on the roller 5 and affecting the flatness of the roller 5. 2. The position of the injection tube 3 is changed by moving the position of the gravity piston block 10, thereby achieving three states. 3. This mechanism moves the roller 5 so that the injection tube 3 can be evenly injected into each position of the roller 5, ensuring the uniform thickness of the fiber membrane. The existing method is to move the injection tube 3, while this solution moves the roller 5. Moving the injection tube 3 can easily cause the injection tube 3 to deviate, and the movement of the injection tube 3 will cause the spinning needle 7 to be subjected to lateral force, which can easily cause the needle to fall off. Moving the roller 5 will not have the above problems.

[0035] The above are only embodiments of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A device for preparing nanofiber membrane by electrospinning, comprising: Box (1); Injection tube (3): the injection tube (3) is matched with the box body (1); Spinning needle (7): the spinning needle (7) is connected to the injection tube (3); Feed pipe (11): the feed pipe (11) is connected to the injection pipe (3), and the feed pipe (11) is provided with a one-way valve; Propulsion mechanism: the propulsion mechanism is used to propel the injection tube (3) to spray the solvent; Roller (5): the roller (5) is rotatably connected to the box (1), and the roller (5) cooperates with the spinning needle (7); Motor (17): the shaft of the motor (17) is fixedly connected to the roller (5), and the motor (17) is matched with the box (1); High-voltage power supply (2): the high-voltage power supply (2) is fixedly connected to the box (1), the high-voltage power supply (2) is electrically connected to the roller (5), and the high-voltage power supply (2) is electrically connected to the spinning needle (7); Controller: the motor (17), the high-voltage power supply (2) and the propulsion mechanism are all electrically connected to the controller; It is characterized by further comprising: Rotating column (13): the rotating column (13) is fixedly connected to the box body (1), and the injection tube (3) is rotatably connected to the rotating column (13); Support mechanism (14): the support mechanism (14) is used to support the injection tube (3); the support mechanism (14) is fixedly connected to the box body (1), and the support mechanism (14) cooperates with the injection tube (3).

2. The device for preparing nanofiber membrane by electrospinning according to claim 1, characterized in that: The propulsion mechanism comprises a hydraulic pump (9) and a piston block, the hydraulic pump (9) is connected to the injection tube (3) via a hose, the hose cooperates with the piston block, the hydraulic pump (9) is fixedly connected to the box (1), the hydraulic pump (9) is electrically connected to the controller, and the piston block is sealingly and slidably connected to the injection tube (3).

3. The device for preparing nanofiber membrane by electrospinning according to claim 2, characterized in that: The piston block is a gravity piston block (10), and the support mechanism (14) comprises a fixed plate (21), a rotating plate (22) and a torque spring (23); the fixed plate (21) is fixedly connected to the box body (1), the rotating plate (22) is rotationally connected to the fixed plate (21) via the torque spring (23), and the rotating plate (22) cooperates with the injection tube (3).

4. The device for preparing nanofiber membrane by electrospinning according to claim 3, characterized in that: It also comprises a limit block (12), two limit blocks (12) are provided, and the limit blocks (12) are used to limit the rotation angle of the injection tube (3), and the limit blocks (12) are fixedly connected to the box body (1).

5. The device for preparing nanofiber membrane by electrospinning according to claim 3, characterized in that: It also comprises a grounding rod (15), wherein the grounding rod (15) is fixedly connected to the box body (1), and the grounding rod (15) cooperates with the spinning needle head (7).

6. The device for preparing nanofiber membrane by electrospinning according to claim 3, characterized in that: It also includes a push switch (24), the push switch (24) being fixedly connected to the fixed plate (21), the push switch (24) being matched with the rotating plate (22), and the push switch (24) being electrically connected to the controller.

7. The device for preparing nanofiber membrane by electrospinning according to claim 1, characterized in that: The invention also comprises a uniform mechanism, which comprises a support frame (8), a connecting rod (20), an air pump (19), a piston plate (16) and a cylinder body (18), wherein the connecting rod (20) is fixedly connected to the roller (5) coaxially, the support frame (8) and the connecting rod (20) are rotationally connected, the piston plate (16) is fixedly connected to the motor (17), the cylinder body (18) is fixedly connected to the box body (1), the piston plate (16) and the cylinder body (18) are sealingly and slidably connected, the air pump (19) is in communication with the cylinder body (18), and the air pump (19) is fixedly connected to the box body (1), and the air pump (19) is electrically connected to the controller.

8. The device for preparing nanofiber membrane by electrospinning according to claim 1, characterized in that: It also comprises a collecting box (6), wherein the collecting box (6) is fixedly connected to the box body (1), and the collecting box (6) cooperates with the spinning needle head (7).

9. The device for preparing nanofiber membrane by electrospinning according to claim 1, characterized in that: It also comprises a humidity detection mechanism and a temperature lamp, wherein the humidity detection mechanism is used to detect the humidity inside the box (1), and the humidity detection mechanism is fixedly connected to the box (1), the temperature lamp is fixedly connected to the box (1), and the temperature lamp is electrically connected to the controller.

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