Folding-free three-dimensional meltblown filter cloth preparation device and folding-free three-dimensional meltblown filter cloth

Abstract

The present invention discloses an apparatus for preparing a non-folding three-dimensional meltblown filter cloth and a non-folding three-dimensional meltblown filter cloth. The apparatus for preparing the non-folding three-dimensional meltblown filter cloth includes a conveying mechanism and a meltblowing mechanism. The conveying mechanism includes an input end and an output end, and a conveyor belt assembly is provided between the input end and the output end of the conveying mechanism. The upper surface of the conveyor belt assembly moves from the input end to the output end. The outer surface of the conveyor belt assembly is continuously provided with a concave-convex structure along its length, and the concave-convex structure is provided with a heat dissipation mechanism for helping the meltblown fibers to dissipate heat. The meltblowing mechanism includes at least one group of spinnerets provided on the top of a rubber conveyor belt, and a cooling distance is provided between the group of spinnerets closest to the output end and the output end. This solution does not require an additional folding process or gluing process and an additional shaping structure to achieve shaping and positioning of the filter cloth, and the meltblown filter layers are naturally bonded to each other, maximizing the porosity and filtration area of ​​the filter cloth and improving processing efficiency.

Description

Technical Field

[0001] The present invention relates to the field of filter element preparation, and in particular to a device for preparing a foldable three-dimensional melt-blown filter cloth and a foldable three-dimensional melt-blown filter cloth. Background Art

[0002] Among filter materials, compared with ordinary filter cloth, wavy filter cloth or pleated filter cloth has a larger contact area with the filtered fluid, which can achieve high-throughput fluid filtration. In addition, the supporting performance of its structure is effectively improved. At the same time, the troughs formed by its structure can accommodate the intercepted impurities to a greater extent. Therefore, its service life will be greatly extended.

[0003] The existing processing methods for wavy filter cloth or pleated filter cloth mainly form ordinary filter cloth into a wavy or pleated shape by folding or gluing. The filter cloth is first folded, and then the folded position of the filter cloth is bonded to other filter layers or positioning structures. However, the above processing method requires the corresponding addition of folding and gluing steps, which has low processing efficiency. In particular, when the filter cloth has multiple filter layers, it is impossible to simultaneously complete the simultaneous formation and shaping of multiple filter layers. In addition, the filter holes of the filter cloth fixed by gluing will be obscured by the glue at the gluing point, so the filtration area of ​​the gluing point needs to be sacrificed. The gluing point is also prone to loosening due to long-term use, affecting the use effect. At the same time, the use of glue is not conducive to environmentally friendly production.

[0004] To address the defects of glue shaping, the utility model patent with authorization announcement number CN221267490U provides a filter material and filter, which replaces the traditional method of fixing the filter material with hot melt adhesive by clamping multiple layers of filter elements between a wavy upper shaping net and a lower shaping net. However, the filter must use an additional shaping structure (shaping net) to shape the filter cloth. On the one hand, the shaping net needs to be prepared separately. On the other hand, the shape of the shaping net limits the structure of the filter and also increases the thickness of the filtering part of the filter. Summary of the Invention

[0005] Therefore, in order to solve the above problems, the present invention provides a non-folding three-dimensional melt-blown filter cloth preparation device and a non-folding three-dimensional melt-blown filter cloth.

[0006] The present invention is achieved through the following technical solutions:

[0007] An unfolded three-dimensional meltblown filter cloth preparation device comprises a conveying mechanism and a meltblowing mechanism, wherein the conveying mechanism comprises an input end and an output end, and a conveyor belt assembly is provided between the input end and the output end of the conveying mechanism, and the upper surface of the conveyor belt assembly moves from the input end to the output end, and the outer surface of the conveyor belt assembly is continuously provided with a concave-convex structure along its length direction, and the concave-convex structure is provided with a heat dissipation mechanism for helping the meltblown fiber to dissipate heat, the meltblowing mechanism comprises at least one group of spinnerets arranged on the top of the rubber conveyor belt, and the spinnerets are provided with spinnerets arranged at equal intervals along the width direction of the conveyor belt assembly. When the meltblowing mechanism comprises multiple spinnerets, the multiple spinnerets are arranged from the input end to the output end, and the spinneret aperture on the spinneret closer to the output end is smaller, and a cooling distance is provided between a group of spinnerets closest to the output end and the output end.

[0008] Preferably, the conveyor belt assembly includes two conveyor rollers arranged at the input end and the output end, and also includes a rubber conveyor belt wound between the two conveyor rollers, the rubber conveyor belt is corrugated, including a plurality of first protrusions and first recesses arranged continuously and staggered, and both conveyor rollers include first protrusions and first recesses arranged at equal angles on their outer circumferences, the first protrusions are engaged with the first protrusions, and the first recesses are engaged with the first recesses, and the heat dissipation mechanism includes heat dissipation holes arranged on both sides of the first protrusions, and the heat dissipation holes are arranged at equal intervals along the width direction of the rubber conveyor belt, and the aperture of the heat dissipation holes is smaller than the aperture of the spinneret holes on a spinneret closest to the input end.

[0009] Preferably, the height of the heat dissipation hole is 1 / 2 of the height difference between the top point of the first convex portion and the bottom point of the first concave portion.

[0010] Preferably, the heat dissipation hole is in a frustum shape, and the end with a smaller diameter of the heat dissipation hole is arranged on the outer surface of the rubber conveyor belt, and the end with a larger diameter of the heat dissipation hole is arranged on the inner surface of the rubber conveyor belt.

[0011] Preferably, the conveyor belt assembly includes two conveyor rollers symmetrically arranged at the input end and the output end, two support belts are symmetrically wound between the two conveyor rollers, and multiple spring rollers are arranged in a staggered manner from the input end to the output end between the two support belts, and each of the spring rollers is parallel to the conveyor roller.

[0012] Preferably, the spring roller includes a heat dissipation portion and support seats coaxially arranged at both ends of the heat dissipation portion, the heat dissipation portion is composed of spirally distributed spring bars, and the heat dissipation portion satisfies the requirement that airflow flows through it in its radial direction and the meltblown material will not be embedded in the gap between the spring bars, and the support seats at both ends of the heat dissipation portion are each fixed to one of the support belts.

[0013] Preferably, a first spring roller and a second spring roller are continuously and alternately arranged between the two support belts, the diameter of the first spring roller is larger than the diameter of the second spring roller, and the axes of the first spring roller and the second spring roller are located at the same height.

[0014] Preferably, the conveyor belt assembly is further provided with a pressure roller at the top of its output end for compacting the topmost filter layer, and the pressure roller includes third convex teeth and third grooves staggered at equal angles on its periphery.

[0015] Preferably, the surface of the spring bar of each spring roller is treated with tetrafluoroethylene.

[0016] The unfolded three-dimensional meltblown filter cloth is manufactured by the unfolded three-dimensional meltblown filter cloth preparation method as described above.

[0017] The beneficial effects of the technical solution of the present invention are mainly reflected in:

[0018] 1. By arranging the first convex portion and the first concave portion at intervals on the rubber conveyor belt, the multi-layer melt-blown filter layer covering the rubber conveyor belt naturally forms a wavy shape, and is naturally positioned and formed during the cooling process. There is no need to achieve positioning through an additional folding process or gluing process, nor is there any need to set an additional shaping structure to shape the filter cloth. At the same time, different filtration accuracies are achieved by setting spinnerets of different apertures between the multi-layer filter layers, and the melt-blown fibers between the melt-blown filter layers are naturally bonded, so the filter holes located at the connection of the filter layers will not be covered, which can maximize the porosity and filtration area of ​​the filter cloth. The processing and shaping of the multi-layer filter layers of the filter cloth are completed simultaneously, thereby improving the processing efficiency of the filter cloth.

[0019] 2. In one embodiment, the heat dissipation mechanism is a heat dissipation hole provided on both sides of the first convex portion of the rubber conveyor belt. Therefore, the fiber filaments vertically sprayed onto the surface of the rubber conveyor belt are not likely to fall directly into the heat dissipation holes opened on the side. The aperture of the heat dissipation hole is smaller than the aperture of the spinneret on a spinneret closest to the input end, thereby ensuring that the melt-blown fibers directly contacting the surface of the rubber conveyor belt will not adhere to the heat dissipation hole and block the heat dissipation hole. At the same time, it can also ensure that the heat flow brought by the melt-blown fibers passes through the heat dissipation hole, thereby accelerating the cooling of the melt-blown fibers. In addition, the spinneret can also be set to a frustum shape, so that the aperture of the end of the spinneret contacting the fiber filament is smaller, and the aperture of the end of the spinneret outputting the heat flow is larger, which is biased towards rapid heat dissipation and cooling.

[0020] 3. In one embodiment, the heat dissipation portion is composed of spirally distributed spring bars, and the heat dissipation portion satisfies the air flow along its radial direction and the melt-blown material does not embed into the gaps between the spring bars. This is because the two adjacent coils of spring bars fit together, ensuring that the melt-blown material does not embed into the gaps between the spring bars. At the same time, since the gaps between the two adjacent coils of spring bars allow hot air to pass through, a uniform and dense heat dissipation channel is formed on the surface of the heat dissipation portion, accelerating heat dissipation and cooling, and ensuring uniform heat dissipation across the surface of the heat dissipation portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 1. It is a schematic diagram of the working state of the first embodiment of the non-folding three-dimensional melt-blown filter cloth preparation device;

[0022] Figure 2 3. A cross-sectional view of a non-folded three-dimensional melt-blown filter cloth produced by the first embodiment of the apparatus for producing a non-folded three-dimensional melt-blown filter cloth;

[0023] Figure 3 This is a schematic diagram of the partial structure of the rubber conveyor belt in Example 1 of the non-folding three-dimensional melt-blown filter cloth preparation device;

[0024] Figure 4 This is a partial structural cross-sectional view of the rubber conveyor belt in Example 1 of the non-folding three-dimensional melt-blown filter cloth preparation device;

[0025] Figure 5 This is a schematic diagram of the staggered arrangement of spring rollers in Example 2 of the non-folding three-dimensional melt-blown filter cloth preparation device;

[0026] Figure 6 This is a schematic diagram of the partial assembly state of the spring rollers and support belts arranged in a high and low staggered manner in the second embodiment of the non-folding three-dimensional melt-blown filter cloth preparation device;

[0027] Figure 7 Schematic diagram of the partial assembly state of the corrugated support belt and the conveyor roller in the second embodiment of the non-folding three-dimensional melt-blown filter cloth preparation device;

[0028] Figure 8 Schematic diagram of the arrangement of the first spring roller and the second spring roller in the second embodiment of the non-folding three-dimensional melt-blown filter cloth preparation device;

[0029] Figure 9 This is an electron microscope image of the microscopic state of the meltblown fibers in filter layer a;

[0030] Figure 10 This is an electron microscope image of the microscopic state of the meltblown fibers in the filter layer b;

[0031] Figure 11 This is an electron microscope image of the microscopic state of the meltblown fibers in the filter layer c. DETAILED DESCRIPTION

[0032] To more clearly and in detail illustrate the objectives, advantages, and features of the present invention, the following non-limiting description of preferred embodiments is provided for illustration and explanation. This embodiment is merely a typical example of the application of the technical solution of the present invention. Any technical solution formed by equivalent substitution or equivalent transformation falls within the scope of protection claimed by the present invention.

[0033] It is also stated that in the description of the scheme, it should be noted that the terms "center", "up", "down", "left", "right", "front", "back", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] Furthermore, the terms "first" and "second" in this solution are used for descriptive purposes only and should not be construed as indicating or implying a ranking of importance or implicitly specifying the number of technical features shown. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0035] The present invention discloses a non-folding three-dimensional melt-blown filter cloth preparation device, such as Figure 1 As shown, it includes a conveying mechanism and a meltblowing mechanism, the conveying mechanism includes an input end and an output end, and a conveyor belt assembly is provided between the input end and the output end of the conveying mechanism, and the upper surface of the conveyor belt assembly moves from the input end to the output end, and the outer surface of the conveyor belt assembly is continuously provided with a concave-convex structure along its length direction, and the concave-convex structure is provided with a heat dissipation mechanism for helping the meltblown fiber to dissipate heat, wherein the concave-convex structure can be a tooth groove structure, a corrugated structure (including an arc-shaped or V-shaped corrugated structure) or other specific shapes or special-shaped concave-convex structures, and the concave-convex structure determines the meltblown filter cloth. shape, therefore, in actual application, the specific shape of the concave-convex structure, the height, width, length, etc. of the first concave portion 302 and the first convex portion 301 can be adjusted as needed, which will not be elaborated here. In a preferred embodiment, in order to ensure that the melt-blown fibers are evenly distributed on the surface of the concave-convex structure, the width of the first concave portion 302 and the first convex portion 301 should be greater than the height of the first concave portion 302 and the first convex portion 301, and the height difference between the first concave portion 302 and the first convex portion 301 does not exceed 50 mm, and the width of the conveyor belt assembly is the length of the first concave portion 302 and the first convex portion 301.

[0036] The meltblowing mechanism includes at least one group of spinnerets 1 arranged on the top of the rubber conveyor belt 3, and the spinnerets 1 are provided with spinnerets (not shown in the figure) arranged at equal intervals along the width direction of the conveyor belt assembly. The number of filter layers of the meltblown filter cloth can be controlled by setting the number of spinnerets 1. At the same time, the filtration accuracy of the meltblown filter cloth can be adjusted by adjusting the aperture of the spinnerets on the spinnerets 1. It will not be elaborated here. When the meltblowing mechanism includes multiple spinnerets 1, the multiple spinnerets 1 are arranged from the input end to the output end, and the spinneret aperture on the spinneret 1 closer to the output end is smaller. At the same time, the spinnerets on the spinnerets 1 closer to the input end are spun toward the upper surface of the conveyor belt assembly sooner, and then, while the upper surface of the conveyor belt assembly moves along the input end to the output end, multiple filter layers with gradually increasing filtration accuracy are sequentially formed on the upper surface of the conveyor belt assembly, such as Figure 1 、 Figure 2 As shown, when spinneret A, spinneret B and spinneret C sequentially spin onto the upper surface of the conveyor belt assembly, filter layers a, b and c are formed on the upper surface of the conveyor belt assembly, respectively. Figures 9-11 As shown, the diameter of the meltblown fiber in the filter layer a is 15μm-50μm, the diameter of the meltblown fiber in the filter layer b is 3.5μm-10μm, and the diameter of the meltblown fiber in the filter layer c is 1.5μm-4.5μm. Therefore, the filtration accuracy is filter layer a < filter layer b < filter layer c; the thickness of each filter layer is the same, and the thickness of the filter layer can be adjusted by changing the moving speed of the conveyor belt assembly. When the moving speed of the conveyor belt assembly is faster, the thickness of the filter layer is thinner, and therefore the thickness of the meltblown filter cloth is thinner; when the moving speed of the conveyor belt assembly is slower, the thickness of the filter layer is thicker, and the thickness of the meltblown filter cloth is thicker. In a preferred embodiment, in order to make the spinning range of the spinneret holes on the upper surface of the conveyor belt assembly relatively concentrated while not affecting the air permeability and filtration efficiency of the filter cloth, the straight-line distance between the spinneret holes on each spinneret plate 1 and the upper surface of the conveyor belt assembly should be between 100 mm and 250 mm. In one embodiment, the heights of the spinneret holes on multiple spinnerets 1 are consistent. In a preferred embodiment, the closer the spinneret holes on the output end are to the spinneret holes, the lower the height is, so that the meltblown fiber density is changed by adjusting the meltblown receiving distance while utilizing the thickness of the meltblown fiber, thereby further adjusting the filtration accuracy between different filter layers.

[0037] During the spinning process, the conveying mechanism moves forward at a uniform speed rather than being stationary. Therefore, the concave-convex structure on the surface of the conveyor belt assembly is also transported and translated from the input end to the output end. During the uniform forward movement of the conveying mechanism, the spinnerets parallel and evenly distributed on the spinneret are spun along their arrangement direction. When the conveying mechanism moves forward at a uniform speed, the concave and convex parts of the concave-convex structure take a similar amount of time to pass through the bottom of the spinneret, and the meltblown filaments will be evenly distributed on the surface of the receiving device.

[0038] A cooling distance is set between a group of spinnerets 1 closest to the output end and the output end to ensure that the surface of the filter cloth is quickly cooled after meltblowing is completed, which is convenient for subsequent compaction and cutting of the filter cloth. The length of the cooling distance can be adjusted according to the thickness of the filter cloth and the material of the meltblown fiber, which will not be elaborated here.

[0039] The specific structure of the conveyor belt assembly can have multiple implementations, which should at least include the following embodiments:

[0040] Example 1:

[0041] like Figures 1-4 As shown, the conveyor belt assembly includes two conveyor rollers 2 arranged at the input end and the output end, and also includes a rubber conveyor belt 3 wound between the two conveyor rollers 2. The conveyor belt made of rubber material can ensure that the melt-blown fiber adheres well to the conveyor belt surface. The rubber conveyor belt 3 is corrugated and includes a plurality of first convex portions 301 and first concave portions 302 arranged continuously and staggered. Both conveyor rollers 2 are corrugated rollers matching the corrugated rubber conveyor belt 3, including first convex teeth 201 and first concave portions 202 staggered at equal angles on their outer peripheries. The first convex teeth 201 and the first convex portions 302 are arranged at the same angles. 01 are meshed with each other, the first groove 202 and the first recess 302 are meshed with each other, thereby ensuring that the two conveying rollers 2 drive the rubber conveyor belt 3 to move along its length direction, one of the two conveying rollers 2 is driven to rotate by a motor, and drives the rubber conveyor belt 3 and the other conveying roller 2 to rotate synchronously, realizing synchronous transmission, and during the conveying process of the rubber conveyor belt 3, the spinnerets on the multiple spinnerets 1 successively spray toward the upper surface of the rubber conveyor belt 3, and are successively superimposed on the upper surface of the rubber conveyor belt 3 to form a plurality of wavy filter layers with uniform shape and thickness and increasing filtration accuracy from bottom to top.

[0042] like Figure 3 、 Figure 4 As shown, the heat dissipation mechanism includes heat dissipation holes 4 arranged on both sides of the first protrusion 301. The melt-blown fibers ejected from the spinneret holes on the spinneret 1 closest to the input end have the thickest diameter and directly contact the upper surface of the rubber conveyor belt 3. Figure 9 As shown, since the meltblown fibers will adhere to each other during the spinning and cooling process, and the meltblown fibers are extremely light filaments, most of the meltblown fibers adhere to the upper surface of the rubber conveyor belt 3 after spinning, and adhere to each other with other meltblown fibers. When the meltblown fibers on the surface cool down, the integrated meltblown cloth can leave the surface of the conveyor belt assembly as a whole. Therefore, even if the meltblown fibers partially enter the heat dissipation holes 4, they will not block the heat dissipation holes 4. The height of the heat dissipation holes 4 is preferably 1 / 2 of the height difference between the top of the first convex portion 301 and the bottom of the first concave portion 302. At this time, the angle between the opening angle of the heat dissipation hole 4 and the spinning direction is the largest, and the meltblown fibers are less likely to enter the heat dissipation holes 4.

[0043] The heat dissipation holes 4 are arranged at equal intervals along the width direction of the rubber conveyor belt 3, and multiple rows of heat dissipation holes 4 can be evenly arranged on both sides of the first protrusion 301. Since the aperture of the spinneret on the spinneret 1 closest to the input end is the largest and it directly contacts the surface of the rubber conveyor belt 3, the aperture of the heat dissipation holes 4 is smaller than the aperture of the spinneret on the spinneret 1 closest to the input end, thereby preventing the melt-blown fibers from flowing into the heat dissipation holes 4 and causing the heat dissipation holes 4 to be blocked or the melt-blown fibers from flowing out of the heat dissipation holes 4, and also preventing the surface of the filter layer from being uneven or leaking.

[0044] The shape of the heat dissipation hole 4 is preferably a frustum. Since the outer surface of the rubber conveyor belt 3 is in direct contact with the melt-blown fiber, the end of the heat dissipation hole 4 with a smaller diameter is arranged on the outer surface of the rubber conveyor belt 3 to prevent the melt-blown fiber from entering the heat dissipation hole 4. At the same time, the end of the heat dissipation hole 4 with a larger diameter is arranged on the inner surface of the rubber conveyor belt 3 to increase the heat dissipation area and facilitate the rapid outflow of the heat flow brought by the melt-blown fiber.

[0045] like Figure 1 As shown, in one embodiment, the conveyor belt assembly is further provided with a pressure roller 7 at the top of its output end for compacting the topmost filter layer, and the pressure roller 7 includes third convex teeth 701 and third grooves 702 staggered at equal angles on its periphery. Specifically, before compacting the meltblown filter layer, it is necessary to ensure that the third convex teeth 701 and the third grooves 702 of the pressure roller 7 match the concave-convex structure on the surface of the filter layer; in addition, the shape and length and width dimensions of the third convex teeth 701 and the third grooves 702 on the pressure roller 7 need to match the actual shape and size of the concave-convex structure on the topmost filter layer, so as to ensure that the filter cloth will not be deformed during the compaction process.

[0046] Example 2:

[0047] like Figure 5-Figure 8 As shown, the conveyor belt assembly includes two conveyor rollers 2 symmetrically arranged at the input end and the output end, two support belts 5 are symmetrically wound between the two conveyor rollers 2, and a plurality of spring rollers 6 are arranged in a staggered manner from the input end to the output end, each of the spring rollers 6 is parallel to the conveyor roller 2, as shown in FIG. Figure 5 、 Figure 6 As shown, at this time, the multiple spring rollers 6 are of the same size, wherein the two support belts 5 can be a conveyor belt with a certain thickness (at least for installing two spring rollers 6 of different heights), and at this time, the two conveyor rollers 2 can be cylindrical conveyor rollers 2; as shown Figure 7As shown, the support belt 5 can also adopt a corrugated or rack-shaped rubber conveyor belt 3. In this case, the two support belts 5 include second convex portions 501 and second concave portions 502 that are continuously staggered. There is a one-to-one correspondence between each second convex portion 501 on the two support belts 5, and there is also a one-to-one correspondence between each second concave portion 502 on the two support belts 5. A spring roller 6 is provided between every two corresponding second convex portions 501, and a spring roller 6 is also provided between every two corresponding second concave portions 502, thereby forming a plurality of spring rollers 6 arranged in a staggered manner between the two support belts 5, and a concave-convex structure is formed on the outer surface of the conveyor belt assembly by the plurality of spring rollers 6 arranged in a staggered manner. At this time, the outer circumferences of the two conveying rollers 2 are provided with second convex teeth and second grooves meshing with the second convex portion 501 and the second concave portion 502 at equal angles, thereby ensuring that the two conveying rollers 2 synchronously drive the first supporting belt and the second supporting belt to move along their length directions. One of the two conveying rollers 2 is driven to rotate by a motor, and drives the two supporting belts 5 and the other conveying roller 2 to rotate synchronously, and realizes the synchronous transmission of multiple spring rollers 6. During the conveying process of the spring roller 6, the spinneret holes on the multiple spinnerets 1 sequentially spray toward the upper surface of the spring roller 6, and are sequentially superimposed on the upper surface of the spring roller 6 to form a plurality of wavy filter layers with uniform shape and thickness and increasing filtration accuracy from bottom to top.

[0048] The spring roller 6 includes a heat dissipation portion 601 and two support seats 602 coaxially arranged at both ends of the heat dissipation portion 601. The heat dissipation portion 601 is composed of spirally distributed spring strips. The adjacent two coils of spring strips on the heat dissipation portion 601 are naturally fitted together to ensure that the melt-blown fibers cannot pass through between the spring strips. There are very small gaps at the natural fitting between the two adjacent coils of spring strips. These small gaps can form a heat dissipation channel between the two adjacent coils of spring strips to allow heat flow to pass through. The spring strips are made of a material with a certain rigidity to ensure that each coil of spring strips does not loosen during the transportation of the spring roller 6, so that the gap size between the two adjacent coils of spring strips remains unchanged, and ensure that the heat dissipation portion 601 The air flow passes along its radial direction and the melt-blown fibers will not be embedded in the gaps between the spring bars. Specifically, since the melt-blown fibers will adhere to each other during the spinning and cooling process, and the melt-blown fibers themselves are slightly curled filaments, even if the melt-blown fibers partially enter the depressions between the spring bars, during the cooling process, the melt-blown fibers will adhere to each other and be flattened on the surface of the spring roller. At the same time, the surface of the spring bars of each spring roller 6 can be treated with tetrafluoroethylene to further prevent the melt-blown fibers from adhering to the gaps between the spring bars. The support seats 602 at both ends of the heat dissipation portion 601 are each fixed to one of the support belts 5, and ensure that the support seats 602 at both ends of the heat dissipation portion 601 are at the same height.

[0049] like Figure 8As shown, the first spring roller 603 and the second spring roller 604 are continuously and alternately arranged between the two support belts 5. The diameter of the first spring roller 603 is larger than the diameter of the second spring roller 604, and the axes of the first spring roller 603 and the second spring roller 604 are located at the same height. At this time, the first support belt and the second support belt can adopt ordinary conveyor belts, and the two conveyor rollers 2 can adopt cylindrical conveyor rollers 2. The diameter difference between the first spring roller 603 and the second spring roller 604 forms a high-low staggered concave-convex structure on the outer surface of the conveyor belt assembly.

[0050] In other embodiments, a cutting mechanism (not shown in the figure) may be provided at the output end of the conveying mechanism for cutting the compacted filter cloth. The cutting mechanism may adopt an existing filter cloth cutting structure, which will not be described in detail here.

[0051] The above-mentioned folding-free three-dimensional melt-blown filter cloth preparation device is operated according to the following steps during actual application:

[0052] S1: driving the upper surface of the conveyor belt assembly to move from the input end to the output end, so that the outer surface of the conveyor belt assembly forms a concave-convex structure, thereby ensuring that the meltblown filter cloth formed on the upper surface of the conveyor belt assembly also has a corresponding concave-convex structure.

[0053] S2: Starting from a group of spinnerets 1 closest to the input end, the holes of the spinnerets 1 in the direction from the input end to the output end are controlled one by one to spin toward the upper surface of the conveyor belt assembly, and a plurality of corrugated filter layers from coarse to fine are sequentially formed on the upper surface of the conveyor belt assembly.

[0054] Among them, the spinneret holes on a group of spinnerets 1 closest to the input end have the largest aperture. Therefore, the diameter of the melt-blown fiber ejected from the spinneret holes is also larger, and a coarse filter layer is first formed on the upper surface of the conveyor belt assembly, and the filtration accuracy of the coarse filter layer is relatively low; the spinneret holes on each subsequent spinneret 1 are smaller in aperture than the spinneret holes on the previous spinneret 1, and the filtration accuracy of the formed filter layer is gradually improved, and are stacked in sequence with the spinning order to form a melt-blown filter cloth with a gradual filtration accuracy.

[0055] S3: The surface of the corrugated filter layer is cooled and shaped during the transportation to the output end, and multiple corrugated filter layers are compacted synchronously along the shape of the corrugated filter layer at the output end to form a fold-free three-dimensional melt-blown filter cloth.

[0056] Among them, a pressure roller can be used to compact the filter layer, wherein the outer peripheral surface of the pressure roller is provided with a structure matching the concave-convex structure of the topmost filter layer, thereby ensuring that the original shape of the filter layer is not affected during the compaction process; then, the compacted meltblown filter cloth is pulled out from the output end and cut according to the required length, which will not be elaborated here.

[0057] The present invention also discloses a non-folding three-dimensional melt-blown filter cloth, which is made using the non-folding three-dimensional melt-blown filter cloth preparation method as described above.

[0058] There are many implementation methods of the present invention, and all technical solutions formed by equivalent transformation or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A foldable three-dimensional meltblown filter cloth preparation device, comprising a conveying mechanism and a meltblowing mechanism, characterized in that: The conveying mechanism includes an input end and an output end, and a conveyor belt assembly is provided between the input end and the output end of the conveying mechanism, and the upper surface of the conveyor belt assembly moves from the input end to the output end, and the outer surface of the conveyor belt assembly is continuously provided with a concave-convex structure along its length direction, and the concave-convex structure is provided with a heat dissipation mechanism for helping the melt-blown fiber to dissipate heat, the melt-blowing mechanism includes a plurality of spinnerets provided on the top of the conveyor belt assembly, and the spinnerets are arranged with spinnerets at equal intervals along the width direction of the conveyor belt assembly. The plurality of spinnerets are arranged from the input end to the output end, and the spinnerets on the spinnerets closer to the output end have smaller apertures, and a group of spinnerets closest to the output end are provided with a cooling distance from the output end; the conveyor belt assembly includes two conveyor rollers provided at the input end and the output end, and also includes a heat dissipation mechanism wound around the two conveyor rollers. The rubber conveyor belt between the two rollers is corrugated and includes a plurality of first protrusions and first recesses arranged continuously and staggered. Both conveying rollers include first protruding teeth and first recesses arranged at equal angles on their outer circumferences, the first protruding teeth are engaged with the first protrusions, and the first recesses are engaged with the first recesses. The heat dissipation mechanism includes heat dissipation holes arranged on both sides of the first protrusions, and the heat dissipation holes are arranged at equal intervals along the width direction of the rubber conveyor belt. The aperture of the heat dissipation holes is smaller than the aperture of the spinneret on a spinneret closest to the input end; the height of the heat dissipation hole is 1 / 2 of the height difference between the top point of the first protrusion and the bottom point of the first recess; the shape of the heat dissipation hole is a frustum, and the end with a smaller diameter of the heat dissipation hole is arranged on the outer surface of the rubber conveyor belt, and the end with a larger diameter of the heat dissipation hole is arranged on the inner surface of the rubber conveyor belt.

2. The foldable three-dimensional meltblown filter cloth preparation device according to claim 1, characterized in that: The conveyor belt assembly is further provided with a pressure roller at the top of its output end for compacting the topmost filter layer. The pressure roller comprises third protruding teeth and third grooves staggered at equal angles on its periphery.

3. A foldable three-dimensional meltblown filter cloth preparation device, comprising a conveying mechanism and a meltblowing mechanism, characterized in that: The conveying mechanism includes an input end and an output end, and a conveyor belt assembly is provided between the input end and the output end of the conveying mechanism, and the upper surface of the conveyor belt assembly moves from the input end to the output end, and the outer surface of the conveyor belt assembly is continuously provided with a concave-convex structure along its length direction, and the concave-convex structure is provided with a heat dissipation mechanism for helping the melt-blown fiber to dissipate heat, and the melt-blowing mechanism includes a plurality of spinnerets provided on the top of the conveyor belt assembly, and the spinnerets are arranged with spinnerets at equal intervals along the width direction of the conveyor belt assembly. The plurality of spinnerets are arranged from the input end to the output end, and the spinnerets on the spinnerets closer to the output end have smaller apertures, and a group of spinnerets closest to the output end are provided with a cooling distance from the output end; the conveyor belt assembly includes symmetrically arranged at the input end and the output end. Two conveyor rollers at the input and output ends, two support belts are symmetrically wound between the two conveyor rollers, and multiple spring rollers are arranged in a staggered manner from the input end to the output end between the two support belts, and each spring roller is parallel to the conveyor roller; the spring roller includes a heat dissipation portion and a support seat coaxially arranged at both ends of the heat dissipation portion, the heat dissipation portion is composed of spirally distributed spring bars, and the heat dissipation portion satisfies the requirement that the air flow flows along its radial direction and the melt-blown material will not be embedded in the gap between the spring bars, and the support seats at both ends of the heat dissipation portion are each fixed to one of the support belts; a first spring roller and a second spring roller are continuously staggered between the two support belts, the diameter of the first spring roller is larger than the diameter of the second spring roller, and the axes of the first spring roller and the second spring roller are located at the same height.

4. The foldable three-dimensional meltblown filter cloth preparation device according to claim 3, characterized in that: The surface of the spring bar of each spring roller is treated with tetrafluoroethylene.

5. Non-folding three-dimensional melt-blown filter cloth, characterized by: The melt-blown filter cloth is made by using the unfolded three-dimensional melt-blown filter cloth preparation device as described in any one of claims 1 to 4.

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