A multi-layer nanofiber filtration membrane laminating assembly device

Abstract

The utility model relates to filter membrane preparation equipment technical field, concretely to a kind of multilayer nanofiber filter membrane superposition assembly device, through the cooperative mechanism of layered precision membrane feeding, whole course tension control, multi-section superposition press and low-temperature heating fusion, the automation, high-precision superposition of different function nanofiber membrane is realized, rack is fixed base, and layered rotating groove of front end U type bearing frame is used to load nanofiber membrane roll of different function, at least three groups layered conveying module are vertically arranged along rack height, ensure that multilayer film material is synchronously conveyed to downstream. Guiding roller and lower roller of tension unit form tension adjusting structure, maintain film material tension stable, avoid tearing or wrinkle, first group of superposition platform preliminary press and eliminate interlayer gap, middle heating box provides low-temperature heating to promote interlayer nanofiber physical fusion, second group of superposition platform carries out secondary press, and strengthens interlayer bonding strength.

Description

Technical Field

[0001] This utility model relates to the technical field of filter membrane preparation equipment, specifically a multilayer nanofiber filter membrane stacking and assembly device. Background Technology

[0002] In the manufacturing process of nanofiber filtration membranes, multilayer lamination is a key step in improving filtration performance, enhancing mechanical strength, and achieving multifunctional integration. However, traditional multilayer nanofiber membrane lamination processes face numerous challenges:

[0003] Insufficient interlayer bonding strength: Traditional lamination methods typically involve only simple pressing devices for initial pressing, lacking an effective heating and fusion mechanism. This results in insufficient interlayer bonding strength and a tendency for delamination, especially in high-temperature and high-humidity environments, which severely affects the service life and performance stability of the filter membrane.

[0004] Poor equipment adaptability: Most existing equipment has a fixed structure, making it difficult to flexibly adjust to meet the requirements of laminating membranes with different numbers or thicknesses. For example, when it is necessary to increase from a three-layer membrane to a five-layer membrane, it is often necessary to replace the entire lamination device, which increases changeover time and cost and reduces the flexibility of the production line.

[0005] Uneven heating problem: Although some automated lamination equipment has introduced heating devices, the unreasonable layout of heating elements or the insufficient precision of the temperature control system leads to uneven heating of the membrane material, frequent occurrences of local overheating or underheating, resulting in membrane material deformation or poor interlayer bonding. Utility Model Content

[0006] (a) Technical problems to be solved

[0007] To address the shortcomings of existing technologies, this invention provides a multilayer nanofiber filter membrane stacking and assembly device.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, this utility model provides the following technical solution: A multilayer nanofiber filter membrane stacking and assembly device of this utility model, comprising:

[0010] Support mechanism, wherein the support mechanism is a frame;

[0011] A layered conveying module, wherein at least three sets of layered conveying modules are arranged vertically along the height of the frame, and each set of layered conveying modules includes a guide roller group and a servo motor. The guide rollers are rotatably mounted on the frame, and the servo motor is fixedly mounted on the outside of the frame and connected to the guide rollers.

[0012] The tensioning unit has at least three sets, each adapted to a three-layered conveying module. The tensioning unit includes guide rollers and pressure rollers, and the guide rollers and pressure rollers are rotatably mounted on the frame.

[0013] The overlapping platform is located downstream of the tensioning unit, and the overlapping platform has at least two sets, including elastic pressure rollers and pressure adjustment units arranged symmetrically on the upper and lower sides. The elastic pressure rollers are made of silicone.

[0014] A heating box is located between two sets of stacked platforms. The heating box has film delivery ports at both ends and electric heating tubes are installed inside the heating box.

[0015] Preferably, it also includes a support frame, which is arranged at the front end of the frame. The support frame has a U-shaped structure and a rotating groove is provided on the inner wall of the support frame. The rotating groove is provided in at least three layers, and the three layers of rotating groove are respectively adapted to three groups of layered conveying modules.

[0016] More preferably, the top of the rotating groove is provided with a guide groove, which extends to the top of the support frame.

[0017] Preferably, the guide roller includes an upper guide roller and a lower guide roller, and the servo motor is connected to the lower guide roller via a geared motor.

[0018] Preferably, the stacking platform includes a frame, the elastic pressure roller includes an active pressure roller and a driven pressure roller, the frame is provided with a feed inlet, the active pressure roller and the driven pressure roller are rotatably mounted on the feed inlet, a drive motor is installed on the side of the frame, and the output end of the drive motor is connected to the active pressure roller.

[0019] More preferably, the feed inlet is provided with grooves on both sides, the upright is provided with an adjustment port, an adjustment motor is installed in the adjustment port, an adjustment screw is installed at the output end of the adjustment motor, a U-shaped rod is fitted on the adjustment screw, the two ends of the U-shaped rod pass through the groove, the two ends of the U-shaped rod are provided with sliders, and the sliders are located in the groove, and the two ends of the driven pressure roller are rotatably mounted on the sliders.

[0020] Preferably, the heating chamber is equipped with a power module at the top, the power module has a power interface, the power module is electrically connected to the heating element, and the heating element is located at the top and bottom of the heating chamber cavity.

[0021] Preferably, the heating box has an observation window on one side and a door hinged to the other side.

[0022] (III) Beneficial Effects

[0023] Compared with the prior art, the present invention provides a multilayer nanofiber filter membrane stacking and assembly device, which has the following beneficial effects:

[0024] The U-shaped support frame and rotating groove design enable convenient loading and layered guidance of the film roll. The servo motor drives the lower guide roller to rotate, and the upper guide roller works in conjunction with the clamping of the film material. Each group has independent speed control to ensure synchronous conveying of multiple layers of film material, which greatly improves production efficiency. At the same time, the tensioning unit forms a tension adjustment structure through the guide roller and the lower pressure roller to maintain stable film material tension and avoid tearing or wrinkling caused by tension fluctuations.

[0025] The first set of lamination platforms initially presses the layers together to eliminate gaps between them. The intermediate heating box provides low-temperature heating of 30-80℃ to promote the physical fusion of nanofibers between the layers. The second set of lamination platforms performs secondary pressing to strengthen the interlayer bonding strength. This multi-stage processing method increases the interlayer peel strength to over 0.3 N / cm, which is 50% higher than the unheated condition, significantly improving the quality of the finished product.

[0026] The lamination platform has grooves on both sides of the feed inlet, and the sliders at both ends of the driven pressure roller are embedded in the grooves. The spacing can be adjusted according to the number or thickness of the film material to adapt to the lamination requirements of different specifications of film materials. When it is necessary to change the number of film material layers, simply stop the machine, adjust the spacing between the pressure rollers of the two sets of lamination platforms, and reset the heating temperature to quickly switch the production mode, which greatly simplifies the changeover operation process. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the layered conveying module structure of this utility model;

[0029] Figure 3 This is a schematic diagram of the stacked platform structure of this utility model;

[0030] Figure 4 This is a schematic diagram of the heating box structure of this utility model;

[0031] Figure 5 This is a schematic diagram of the cross-sectional structure of the heating box of this utility model;

[0032] In the diagram: 1. Frame; 2. Support frame; 3. Stacking platform; 4. Heating box; 5. Rotating groove; 6. Guide groove; 7. Upper guide roller; 8. Lower guide roller; 9. Guide roller; 10. Lower pressure roller; 11. Power module; 12. Observation window; 13. Film feeding port; 14. Servo motor; 15. Box door; 16. Power interface; 17. Stand; 18. Feed inlet; 19. Adjustment port; 20. Active pressure roller; 21. Driven pressure roller; 22. Adjusting motor; 23. Adjusting screw; 24. U-shaped rod; 25. Slider; 26. Slide groove; 27. Drive motor; 28. Electric heating tube. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Please see Figure 1-5 The present invention provides a multilayer nanofiber filter membrane stacking and assembly device, comprising:

[0035] The support mechanism is the frame 1;

[0036] The layered conveying module is provided with at least three sets of layers arranged vertically along the height of the frame 1. Each layered conveying module includes a guide roller group and a servo motor 14. The guide rollers are rotatably mounted on the frame, and the servo motor 14 is fixedly mounted on the outside of the frame 1. The servo motor 14 is connected to the guide rollers.

[0037] The tensioning unit has at least three sets, each adapted to a three-layered conveying module. The tensioning unit includes a guide roller 9 and a pressure roller 10, and the guide roller 9 and the pressure roller 10 are rotatably mounted on the frame 1.

[0038] The overlapping platform 3 is located downstream of the tensioning unit, and the overlapping platform 3 is provided with at least two sets, including elastic pressure rollers and pressure adjustment units arranged symmetrically on the upper and lower sides. The elastic pressure rollers are made of silicone material.

[0039] The heating box 4 is located between the two sets of stacked platforms 3. The heating box 4 has film delivery ports 13 at both ends and electric heating tubes 28 are installed inside the heating box 4.

[0040] This technical solution achieves automated and high-precision lamination of nanofiber membranes with different functions through a synergistic mechanism of layered precise membrane delivery, full-process tension control, multi-segment lamination and pressing, and low-temperature heating fusion. Its overall working principle is as follows:

[0041] Basic support and membrane roll loading: The frame 1 serves as a fixed base, and the layered rotating groove 5 of the front U-shaped support frame 2 is used to load nanofiber membrane rolls with different functions, such as retention layer, adsorption layer and support layer. The membrane roll is introduced into the partition rotating groove 5 through the guide groove 6.

[0042] Layered conveying and speed synchronization: At least three layers of conveying modules are set vertically along the height of the frame 1. The lower guide roller 8 is driven to rotate by the servo motor 14, and the upper guide roller 7 is used to clamp the film material. Each group has independent speed control to ensure that the multi-layer film material is conveyed to the downstream synchronously.

[0043] Tension control to prevent breakage: The guide roller 9 and the pressure roller 10 of the tensioning unit form a tension adjustment structure. The slight pressure of the pressure roller 10 on the membrane material maintains the stability of the membrane material tension and prevents the nanofiber membrane from tearing or wrinkling due to tension fluctuations.

[0044] Multi-stage lamination and pressing: The active pressure roller 20 and driven pressure roller 21 of the first lamination platform 3 perform preliminary pressing on the multilayer film material to eliminate interlayer gaps; the intermediate heating box 4 provides low-temperature heating, such as 30-80℃, through the upper and lower electric heating tubes 28 to promote the physical fusion of interlayer nanofibers; the second lamination platform 3 performs secondary pressing to strengthen the interlayer bonding strength.

[0045] Process monitoring and maintenance: The observation window 12 of the heating chamber 4 facilitates real-time monitoring of the heating status of the membrane material, and the chamber door 15 can be opened for maintenance of the electric heating tube 28 to ensure continuous and stable operation of the equipment.

[0046] U-shaped support frame 2, rotating groove 5 and guide groove 6

[0047] This structure is the core of enabling convenient loading and layered guidance of membrane rolls. Its working principle is as follows:

[0048] Membrane roll loading: The support frame 2 has a U-shaped structure with at least three rotating grooves 5 on the inner wall. The spacing between each layer is adapted to the height of the layered conveying module and is used to place the membrane roll mandrel. The membrane roll can rotate freely in the rotating grooves 5.

[0049] The guide groove 6 at the top of the rotating groove 5 extends to the top of the support frame 2. When loading the film, both ends of the film roll can be placed in the corresponding rotating groove 5 along the guide groove 6.

[0050] The guide roller is driven by a servo motor and a geared motor.

[0051] This design is used to precisely control the membrane material conveying speed and clamping stability. Its working principle is as follows:

[0052] The upper guide roller 7 is passively rotated and the lower guide roller 8 is actively rotated, arranged symmetrically. The membrane material passes through the top of the upper guide roller 7 and the bottom of the lower guide roller 8 and is guided to the tensioning unit. When the lower guide roller 8 rotates, it drives the membrane material forward through friction. The upper guide roller 7 moves along with the membrane material under the tension of the membrane material, forming a pinch-type conveying to avoid the membrane material slipping.

[0053] Precise speed control: The servo motor 14 is connected to the lower guide roller 8 through the geared motor. The geared motor can reduce the output speed of the servo motor 14 and increase the torque. At the same time, it can make the speed adjustment of the lower guide roller 8 more precise, ensuring that the film material conveying speed of the three-component layered conveying module is completely synchronized and avoiding interlayer misalignment.

[0054] Adjustment structure of the superimposed platform 3

[0055] This structure is designed to accommodate the lamination requirements of films with different numbers of layers / thicknesses. Its working principle is as follows:

[0056] Spacing adjustment: The feed inlet 18 of the stacking platform 3 is provided with grooves 26 on both sides, and the sliders 25 at both ends of the driven pressure roller 21 are embedded in the grooves 26; when the number of film layers increases, such as from 3 layers to 5 layers or the thickness increases, the adjustment motor 22 is started, driving the adjustment screw 23 to rotate, which drives the U-shaped rod 24 mounted on the screw to move up and down. When the screw rotates forward, the U-shaped rod 24 rises, and the driven pressure roller 21 moves away from the driving pressure roller 20; when it rotates in reverse, it falls, and the spacing decreases.

[0057] Pressure adaptation: By adjusting the distance between the driven pressure roller 21 and the active pressure roller 20, and in conjunction with the silicone material of the elastic pressure roller, it is ensured that the pressure roller applies uniform pressure to film materials of different thicknesses, which avoids the gap between layers caused by insufficient pressure, and also prevents the film material from being torn by excessive pressure.

[0058] Heating box 4

[0059] Heating chamber 4 is used for low-temperature heating to promote the fusion of interlayer nanofibers. Its working principle is as follows:

[0060] Uniform heating: Electric heating tubes 28, such as stainless steel heating tubes, are installed at the top and bottom of the inner cavity of the heating box 4. The power module 11 is connected to the mains power through the power interface 16 to supply power to the electric heating tubes 28. The electric heating tubes 28 are arranged in a serpentine pattern to ensure uniform temperature inside the heating box 4. The membrane material is heated as a whole when it passes through the membrane inlet 13, avoiding local overheating that could cause the membrane material to deform.

[0061] Fusion Enhancement: The heating temperature is controlled at 30-80℃, which is lower than the melting point of the nanofiber membrane. For example, the melting point of PVDF membrane is about 170℃. The low temperature can make the surface of the interlayer nanofibers slightly soft, and form physical adhesion under subsequent lamination and compression. The interlayer peel strength is increased to more than 0.3N / cm, which is 50% higher than the condition without heating.

[0062] The observation window 12 and the door 15 of the heating chamber 4

[0063] This design is for process monitoring and equipment maintenance, and its working principle is as follows:

[0064] Real-time monitoring: The observation window 12 is made of high-temperature resistant transparent quartz glass. Operators can directly observe the conveying status of the film material in the heating box 4 through the observation window 12, promptly detect abnormalities and stop the machine for adjustment, and avoid batch scrapping.

[0065] Easy maintenance: The hinged door 15 on the other side of the heating chamber 4 can be opened outwards. When the heating tube 28 is damaged or fiber dust accumulates inside the chamber, the heating tube 28 can be replaced or the inner cavity can be cleaned by opening the door 15.

[0066] Detailed Workflow

[0067] Step 1: Device Initialization and Parameter Setting

[0068] Membrane roll loading: The mandrels of three nanofiber membrane rolls with different functions, such as the support layer, the retention layer and the adsorption layer, are placed into the three-layer rotating groove 5 of the U-shaped support frame 2 respectively; the free end of each roll of membrane material is passed through the upper guide roller 7 and the lower guide roller 8 of the corresponding layered conveying module in sequence, until it reaches the guide roller 9 and the lower pressure roller 10 of the tensioning unit.

[0069] Step 2: Layered film feeding and tension control

[0070] Start conveying: The servo motor 14 of the three-layer conveying module is started synchronously. The servo motor 14 drives the lower guide roller 8 to rotate via the reduction motor. The upper guide roller 7 rotates passively with the film material. The three layers of film material are synchronously conveyed to the tensioning unit under the clamping of the upper and lower guide rollers 8.

[0071] Tension adjustment: When the membrane material passes through the tensioning unit, the guide roller 9 changes the conveying direction of the membrane material, and the pressure roller 10 lightly presses the surface of the membrane material to maintain stable membrane tension and avoid the membrane material from becoming loose and wrinkled or too tight and tearing.

[0072] Step 3: First overlapping and pressing

[0073] Membrane alignment: The three layers of membrane material are simultaneously fed into the feed port 18 of the first stacking platform 3, and driven by the drive motor 27 to rotate the active pressure roller 20, which is pulled into the space between the active pressure roller 20 and the driven pressure roller 21.

[0074] Preliminary pressing: The active pressure roller 20 and the driven pressure roller 21 apply a pressure of 0.3MPa to the multilayer film material to squeeze out the interlayer air and achieve preliminary lamination.

[0075] Step 4: Heating and Fusion

[0076] Entering the heating chamber 4: The pre-stacked membrane material enters the inner cavity of the heating chamber 4 through the membrane inlet 13 at one end of the heating chamber 4. Under the uniform heating of the electric heating tubes 28 distributed on the upper and lower sides, the surface of the interlayer nanofibers softens slightly.

[0077] Process monitoring: Operators monitor the membrane material conveying status in real time through the observation window 12 of the heating box 4 to confirm that the membrane material does not deviate or overheat and deform. The membrane material stays in the heating box 4 for about 10 seconds. The dwell time is calculated based on the conveying speed and the length of the heating box 4. For example, if the length of the heating box 4 is 167mm, the dwell time is 10 seconds at a speed of 1m / min to ensure that the interlayer fibers are fully softened.

[0078] Step 5: Second overlapping and pressing

[0079] Secondary reinforcement: The heated membrane material passes through the film feeding port 13 at the other end of the heating box 4 and enters the feed port 18 of the second set of laminating platforms 3; the active pressure roller 20 and the driven pressure roller 21 of the second set of laminating platforms 3 apply a pressure of 0.4MPa to the membrane material, compact the softened interlayer fibers, promote physical fusion, and strengthen the interlayer bonding strength.

[0080] Pressure roller adjustment: If an increase in film thickness is detected, such as when a thicker film is used, the adjustment motor 22 of the second set of laminating platform 3 can be started to drive the adjustment screw 23 to rotate, which will drive the U-shaped rod 24 and the slider 25 to rise, increase the distance between the driven pressure roller 21 and the active pressure roller 20, and avoid excessive pressure.

[0081] Step 6: Finished Product Output and Equipment Maintenance

[0082] Finished product conveying: The multi-layer composite film after secondary pressing is output from the second stacking platform 3 and enters the subsequent winding station;

[0083] Troubleshooting: If wrinkles are found in the membrane material through the observation window 12, stop the machine immediately and check whether the tension of the membrane material by the guide rollers and tensioning unit is too small, or whether the spacing of the pressure rollers of the stacking platform 3 is appropriate; if the temperature of the heating box 4 is abnormal, turn off the power module 11 and open the box door 15 to check whether the heating tube 28 is damaged.

[0084] Changeover operation: If the number of membrane layers needs to be changed, such as from 3 layers to 5 layers, after stopping the machine, adjust the distance between the pressure rollers of the two sets of stacking platforms 3, reset the heating temperature, replace the membrane roll on the carrier frame 2, and repeat steps 2-5.

[0085] Step 7: Shutdown and Cleaning

[0086] Shutdown procedure: After production is completed, first turn off the power module 11 of the heating box 4. After the temperature drops to room temperature, turn off the servo motor 14 and the drive motor 27.

[0087] Equipment cleaning: Open the door 15 of the heating chamber 4 and use a soft brush to clean the fiber dust on the inner cavity and the surface of the heating tube 28; wipe the surface of the elastic pressure rollers of the two sets of overlapping platforms 3 to remove residual fibers and avoid contaminating the film material in the next production.

[0088] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multilayer nanofiber filter membrane stacking and assembly device, characterized in that, include: A support mechanism, wherein the support mechanism is a frame (1); The layered conveying module is arranged vertically along the height of the frame (1) with at least three groups, and each layered conveying module includes a guide roller group and a servo motor (14). The guide roller is rotatably mounted on the frame, and the servo motor (14) is fixedly mounted on the outside of the frame (1). The servo motor (14) is connected to the guide roller. The tensioning unit is provided with at least three sets, which are adapted to the three sets of layered conveying modules respectively. The tensioning unit includes a guide roller (9) and a pressure roller (10), and the guide roller (9) and the pressure roller (10) are rotatably mounted on the frame (1). The overlapping platform (3) is located downstream of the tensioning unit, and the overlapping platform (3) is provided with at least two sets, including elastic pressure rollers and pressure adjustment units arranged symmetrically on the upper and lower sides. The elastic pressure rollers are made of silicone material. The heating box (4) is located between the two sets of stacked platforms (3). The heating box (4) has film delivery ports (13) at both ends. The heating box (4) is equipped with electric heating tubes (28).

2. The multilayer nanofiber filter membrane stacking and assembly device according to claim 1, characterized in that, It also includes a support frame (2), which is arranged at the front end of the frame (1). The support frame (2) has a U-shaped structure and a rotating groove (5) is provided on the inner wall of the support frame (2). The rotating groove (5) has at least three layers, and the three layers of rotating groove (5) are respectively adapted to the three groups of layered conveying modules.

3. The multilayer nanofiber filter membrane stacking and assembly device according to claim 2, characterized in that, The top of the rotating groove (5) is provided with a guide groove (6), which extends to the top of the support frame (2).

4. The multilayer nanofiber filter membrane stacking and assembly device according to claim 1, characterized in that, The guide rollers include an upper guide roller (7) and a lower guide roller (8), and the servo motor (14) is connected to the lower guide roller (8) through a geared motor.

5. The multilayer nanofiber filter membrane stacking and assembly device according to claim 1, characterized in that, The stacking platform (3) includes a frame (17), the elastic pressure roller includes an active pressure roller (20) and a driven pressure roller (21), the frame (17) is provided with a feed inlet (18), the active pressure roller (20) and the driven pressure roller (21) are rotatably mounted on the feed inlet (18), a drive motor (27) is installed on the side of the frame (17), and the output end of the drive motor (27) is connected to the active pressure roller (20).

6. The multilayer nanofiber filter membrane stacking and assembly device according to claim 5, characterized in that, The feed inlet (18) has grooves (26) on both sides. The upright frame (17) has an adjustment port (19). An adjustment motor (22) is installed in the adjustment port (19). An adjustment screw (23) is installed at the output end of the adjustment motor (22). A U-shaped rod (24) is fitted on the adjustment screw (23). Both ends of the U-shaped rod (24) pass through the grooves (26). Slider blocks (25) are provided at both ends of the U-shaped rod (24). The sliders (25) are located in the grooves (26). Both ends of the driven pressure roller (21) are rotatably mounted on the sliders (25).

7. The multilayer nanofiber filter membrane stacking and assembly device according to claim 1, characterized in that, The heating box (4) is provided with a power module (11) on the top. The power module (11) is provided with a power interface (16). The power module (11) is electrically connected to the heating tube (28). The heating tube (28) is located at the top and bottom of the inner cavity of the heating box (4).

8. The multilayer nanofiber filter membrane stacking and assembly device according to claim 1, characterized in that, The heating box (4) has an observation window (12) on one side and a door (15) hinged to the other side.

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