Composite filter cartridge centrifugal forming device and forming process

Abstract

The invention discloses a composite filter cartridge centrifugal forming device and a forming process. A forming box is filled with water; injecting the fiber mixed solution into an inner mold with sieve pores in a forming box, wherein the rotating speed of the inner mold with sieve pores is gradually increased from low to high in the process; the fiber mixed liquid is mixed and distributed in the water of the inner mold with the sieve pores by centrifugal force, and water in the fiber mixed liquid is discharged through the sieve pores of the inner mold with the sieve pores under the action of the centrifugal force to form a composite filter cartridge; the forming mechanism is simple in system, does not need a vacuum negative pressure forming system, and achieves uniform distribution under the action of water flow in the forming box body by utilizing the characteristics that fibers are small, light, not easy to settle and uniform in distribution. The surfaces of the inner layer and the outer layer of the composite filter cartridge subjected to high-speed centrifugal molding have no pits, are neat and not rough, and do not need secondary polishing; and by adopting a material-shaft-free design, extrusion deformation of the reinforcing net caused by mechanical extrusion of a material shaft is avoided, so that reinforcing framework nets in different forms can be added in the mold, and integrated interweaving centrifugal forming with fibers is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of composite filter cartridge production, in particular to a composite filter cartridge centrifugal molding device and a molding process. Background Art

[0002] The composite filter cartridge is the core filtration unit of the dust and saltpeter integrated technology. It has the advantages of high porosity, low resistance, high temperature resistance, acid and alkali corrosion resistance, etc. It can achieve the coordinated removal of multiple pollutants such as dust, nitrogen oxides, and heavy metals. It has been widely used in the coordinated treatment of multiple pollutants in high-temperature flue gas such as glass kilns, biomass, and waste incineration.

[0003] At present, the main production processes of composite filter cartridges include suction molding, weaving molding and winding molding. The suction molding process is mainly divided into vacuum external filtration technology and vacuum internal filtration technology.

[0004] The vacuum external filtration technology is to send the mixed and stirred fiber mixture into the inner shaft of the mold. The inner shaft rotates at a low speed and evenly exits the mold from the tail end to the head of the finished product. Under the vacuum negative pressure and the extrusion of the inner shaft, the mixed liquid is evenly distributed on the inner surface of the mold along the circumferential direction and the axial direction. The water in the mixed liquid is filtered out by negative pressure through the sieve holes on the surface of the mold. The fibers are stacked on the inner surface of the mold to form a composite filter cartridge, which is finally dried to form a finished product.

[0005] The forming principle of vacuum inner filtration is to separate the solid and liquid in the fiber mixture through the sieve holes on the mold surface under the action of vacuum negative pressure, so that the fiber material adheres to the porous mold surface, and then a composite filter cartridge is obtained. The difference from the external filtration type is that the entire forming mold is immersed in the slurry pool, and the fiber is adsorbed on the mold surface purely by vacuum negative pressure filtration to obtain the filter cartridge. The vacuum negative pressure exerts limited force on the fiber, resulting in a rough and loose outer surface structure with low strength. It is necessary to polish the outer surface of the filter cartridge and then use sintering or secondary vacuum filtration coating to improve the strength of the filter cartridge so that a dense layer is formed on its outer surface.

[0006] At present, the mainstream specifications of composite filter cartridges at home and abroad are φ150×3000mm. The research and development of composite filter cartridges with specifications above 4m has become the key research focus of the filter cartridge manufacturing industry. Higher requirements are put forward for mold manufacturing, material wear resistance and rigidity of the material shaft. A slight defect in the mold can easily cause a series of problems such as large deviation of the filter cartridge wall thickness, tail hanging, roughness, non-concentric deformation of the middle and rear parts, and unqualified strength. In order to ensure uniform fiber distribution and low wear between the mold and the fiber, the speed of the material shaft or the mold during the filtration process is very low, and the vacuum negative pressure system is mainly used to achieve the uniformity of fiber distribution and the purpose of solid-liquid separation. The fluctuation of the vacuum system will affect the overall uniformity of the filter cartridge, so the stability of the entire vacuum system and the air tightness of the mold are required to be high. When only considering the slurry gravity factor, calculated with a mold with a diameter of 150mm, when its theoretical speed is greater than 120r / min, it can generate a centrifugal force sufficient to overcome gravity (1g) and keep the fiber in contact with the inner wall of the mold without falling off for true centrifugal molding. After comprehensively considering the extrusion force factors formed by the friction between different fibers and powders and the sedimentation resistance, in actual production, the speed needs to be much higher than 120r / min to achieve dense distribution between fibers through centrifugal force.

[0007] For example, in the patent announcement number CN 110344288 B "Ceramic fiber tube filtration molding system and method", when the mold rotates at high speed, its rotation speed is only 70r / min-120r / min; for example, in the patent publication number CN116280998A "A fiber tube horizontal centrifugal molding device and molding process", the rotation speed of the cylinder is only 25r / min-30r / min; from the analysis of the molding process, the "centrifugal molding" process with a vacuum negative pressure system is essentially negative pressure filtration molding, which does not belong to the category of centrifugal molding technology. The rotation speed in its production process is not enough to provide sufficient centrifugal force to achieve centrifugal molding of the fiber mixture.

[0008] For example, patent announcement number CN114734530B "Horizontal centrifugal forming machine for wet pipe making" feeds materials while the inner shaft rotates at a low speed, and the process is accompanied by a pressurization process. Due to the rotation and extrusion of the inner shaft, the inner surface of the filter cartridge will become rough and not smooth, and it needs to be polished. At the same time, the inner shaft and the shaft end support parts are easily worn due to long-term extrusion and friction with the fibers, aggregates, etc. in the slurry, and the maintenance and replacement rate is high. In addition, due to the different degrees of wear of the inner shaft, it causes it to be out of alignment with the mold, which is easy to cause quality problems such as bending and poor straightness of the finished product. If it is used on a slender composite filter cartridge, the accuracy requirements for the material shaft are even more stringent. Summary of the invention

[0009] The purpose of the present invention is to provide a composite filter cartridge centrifugal molding device and molding process to solve the problems raised in the above background technology.

[0010] To achieve the above object, the present invention provides the following technical solutions: A composite filter cartridge centrifugal forming process comprises the following steps: Fill the molding box with water; Then the fiber mixture is injected into the inner mold with sieve holes in the forming box. During this process, the speed of the inner mold with sieve holes is gradually increased from low to high. The fiber mixture is mixed and distributed in the water of the inner mold with the sieve holes by centrifugal force, and the water in the fiber mixture is discharged through the sieve holes of the inner mold with the sieve holes under the action of centrifugal force to form a composite filter cartridge.

[0011] Preferably, during the process of injecting the fiber mixture into the inner mold with sieve holes, the rotation speed of the inner mold with sieve holes is uniformly increased from 0 r / min to 130 r / min; During the centrifugal process, the rotation speed of the inner mold with the sieve hole is above 1000r / min.

[0012] Preferably, a reinforcing skeleton net is placed in the inner mold with sieve holes; the reinforcing skeleton net is in a double helix structure; and the reinforcing skeleton net is made of high temperature resistant material.

[0013] A composite filter cartridge centrifugal forming device, based on a composite filter cartridge centrifugal forming process, comprises: The molding box is provided with an overflow port at the top and a drain port at the bottom; An inner mold with a sieve hole is arranged inside the molding box; A driving mechanism drives the inner mold with the sieve holes to rotate through a rotating mechanism; The feeding mechanism is movably connected to the inner mold with sieve holes and is used for conveying water and fiber mixed liquid into the inner mold with sieve holes.

[0014] Preferably, the molding box includes an upper box body, a lower box body, a sealing strip and a flip telescopic assembly; the flip telescopic assembly drives the upper box body to flip to cover or separate the lower box body, and the sealing strip is arranged on the abutting surface of the upper box body and the lower box body.

[0015] Preferably, the rotating mechanism includes a bearing seat, an adjustment mechanism, a driving shaft and a feed shaft; one end of the inner mold with sieve holes is transmission-connected to the driving mechanism via the driving shaft, and the other end of the inner mold with sieve holes is movably connected to the feeding mechanism via the feed shaft; the adjustment mechanism is used to drive the corresponding bearing seat to move along the radial direction of the inner mold with sieve holes; the driving shaft and the feed shaft are rotatably connected to the corresponding bearing seats.

[0016] Preferably, the feeding mechanism comprises a fixing seat and a three-way assembly mounted on the fixing seat, the first port of the three-way assembly is coaxially movably connected with the feeding shaft and interconnected, and the second and third ports of the three-way assembly are respectively arranged as a water inlet and a feeding port.

[0017] Preferably, the driving mechanism includes a motor base and a driving motor mounted on the motor base, and the driving motor is connected to the driving shaft via a belt transmission assembly.

[0018] Preferably, the inner mold with sieve holes comprises more than one group of inner molds connected end to end in sequence.

[0019] Preferably, it also includes a movable adjustment mechanism, which includes a base, a guide rail fixed on the base, and a slider, and the feeding mechanism moves and cooperates on the guide rail along the rotation axis direction of the inner mold with sieve holes through the slider.

[0020] Compared with the prior art, the present invention has the following beneficial effects: The molding mechanism system of the present invention is simple, does not require a vacuum negative pressure molding system, and can adapt to the production of composite filter cartridges with different length specifications.

[0021] The fibers are fed into the inner mold with sieve holes in the water-filled forming box through the feeding mechanism. The fibers are evenly distributed under the action of water flow in the forming box because they are small, light, not easy to settle and evenly distributed.

[0022] The present invention overcomes the sedimentation force and deadweight of the fiber slurry through the stably output centrifugal force, thereby achieving autonomous and uniform distribution of the fiber slurry in a mold with no inner shaft structure. The molding length is not limited by the slender inner shaft, thus avoiding the problems of wear and deformation of the inner shaft, high replacement rate, and damage to the filter cartridge flange caused by eccentricity when withdrawing the shaft. There is no wear between the mold and the fiber, the equipment maintenance requirement is low, and composite filter cartridges of different lengths and types can be produced as needed.

[0023] The inner and outer surfaces of the composite filter cartridge formed by high-speed centrifugal molding are free of pits, neat and not rough, and do not require secondary grinding. The inner wall of the filter cartridge has no rough structures such as pits and holes. The jet cleaning resistance is low, which is conducive to pulse cleaning. The molding time is short, the entire molding time is about 6 minutes, which saves about 40% of the time compared to the existing suction filtration molding.

[0024] The moisture content of the composite filter cartridge after high-speed centrifugation is reduced, and the drying time is reduced by 30%. The production efficiency is high, and the finished product has the characteristics of high wall thickness uniformity, obvious layered structure, and low system resistance. With the same fiber formula and the same sample wall thickness, the pressure drop of the composite filter cartridge formed by high-speed centrifugation can be 38.8% lower than that of the suction filter cartridge.

[0025] The relative centrifugal force of the filter cartridge made by the high-speed centrifugal process increases linearly from the inside to the outside, and the density of the finished product is higher than that of the filter cartridge made by the suction filtration process. In particular, the centrifugal force of the outer surface reaches 85g, and the density is more than 25% higher than that of the inner surface, which can fully improve the filtering performance of the filter cartridge, further improve the filtering performance of the composite filter cartridge for ultra-fine dust and heavy metals, avoid dust and heavy metal penetration causing the filter cartridge life to decay, and greatly improve the service life of the composite filter cartridge.

[0026] The composite filter cartridge has an increased slenderness ratio, reduced overall strength, and poor stability, which leads to problems such as breakage during transportation, installation, and use. A reinforced skeleton net is placed inside the inner mold with sieve holes, and high-speed centrifugation is used to fully interweave the fiber material with the reinforced skeleton net to form a reinforced filter cartridge. Under the same specifications, the reinforced filter cartridge is more stable than the unreinforced filter cartridge and is less likely to break. The filter cartridge prepared with the reinforced skeleton has no obvious stress concentration area and is suitable for high-incidence earthquake zones. It can effectively reduce external vibration damage caused by low-frequency earthquakes, blowing, and uneven airflow.

[0027] The present invention adopts a material shaft-free design, and will not cause extrusion deformation of the reinforcing net due to mechanical extrusion of the material shaft. Therefore, different forms of reinforcing skeleton nets can be added to the mold to facilitate centrifugal molding by interweaving with the fibers. The degree of interweaving with the fibers is large, which can achieve a protective effect on the filter cartridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0029] Figure 1 It is an isometric schematic diagram of the present invention; Figure 2 It is the front view of the present invention; Figure 3 A top view of the present invention; Figure 4 It is a left side view of the present invention; Figure 5 This is a schematic diagram of negative pressure clamping of the present invention; Figure 6 It is an isometric schematic diagram of the inner mold with sieve holes of the present invention; Figure 7 This is a schematic diagram of the reinforcement skeleton network of the present invention; Figure 8 This is a schematic diagram of the composite filter cartridge prepared by the present invention.

[0030] The reference numerals in the figure are as follows: 1. Driving mechanism; 101. Driving motor; 102. Motor seat; 103. Reference seat; 104. Adjusting foot cup; 105. First pulley; 106. Second pulley; 107. Belt; 2. Rotating mechanism; 201. Bearing seat; 202. Adjusting mechanism; 203. Flange assembly; 204. Driving shaft; 205. Feeding shaft; 3. Forming box; 301. Upper box body; 311. Overflow port; 302. Lower box body; 312. Drain port; 303. Sealing strip; 304. Support bracket; 305. Flipping telescopic assembly; 306. Pressing telescopic assembly; 4. Inner mold with sieve hole; 5. Feeding mechanism; 501. Three-way assembly; 502. Fixed seat; 503. Connecting flange; 6. Moving and adjusting mechanism; 601. Base; 602. Sliding block; 603. Guide rail; 7. Base; 8. Negative pressure clamping mechanism; 9. Strengthening skeleton net. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Example: A reinforced multi-specification composite filter cartridge centrifugal forming device, as shown in the attached Figure 1-8 As shown, it includes a driving mechanism 1, a rotating mechanism 2, a forming box 3, an inner mold with sieve holes 4, a feeding mechanism 5, a moving adjustment mechanism 6, a base 7, a negative pressure clamping mechanism 8 and a reinforcing skeleton net 9.

[0033] The driving mechanism 1, the rotating mechanism 2, the molding box 3, the inner mold with sieve holes 4, the feeding mechanism 5, and the moving mechanism 6 are installed above the base 7, and the driving mechanism 1 is on the left side of the entire device; the molding box 3 and the inner mold with sieve holes 4 are placed in the middle of the overall device, wherein the inner mold with sieve holes 4 is placed inside the molding box 3; the feeding mechanism 5 and the moving adjustment mechanism 6 are placed on the right side of the overall device, wherein the feeding mechanism 5 is placed above the moving adjustment mechanism 6, and the rotating mechanism 2 is placed on the left and right sides of the molding box 3 and the inner mold with sieve holes 4 respectively.

[0034] The driving mechanism 1 comprises a driving motor 101, a motor base 102, a reference base 103, an adjusting foot cup 104, a first pulley 105, a second pulley 106 and a belt 107. The driving motor 101 is placed on the motor base 102, the main shaft of the driving motor 101 is connected to the first pulley 105, the first pulley 105 is connected to the second pulley 106 through the belt 107, the above mechanism is placed on the reference base 103, and the adjusting foot cup 104 is placed under the reference base 103. The first pulley 105, the second pulley 106 and the belt 107 constitute a belt transmission assembly.

[0035] The rotating mechanism 2 includes a bearing seat 201, an adjustment mechanism 202, a flange assembly 203, a driving shaft 204 and a feed shaft 205. There are two bearing seats 201, which are respectively placed on the reference seat 103 of the driving mechanism 1 and the movable adjustment mechanism 6; the adjustment mechanism 202 is placed on both sides of the bearing seat 201 to adjust the coaxiality of the two bearing seats 201; there are two flange assemblies 203, which are respectively placed on the left and right sides of the molding box 3, and bearings and sealing rings are placed inside the flange assembly 203. The driving shaft 204 and the feed shaft 205 pass through the flange assemblies 203 and the bearing seat 201 on both sides respectively; The left end of the driving shaft 204 is coaxially connected to the second pulley 106, and the right end of the driving shaft 204 is coaxially connected to the left end of the inner mold 4 with sieve holes; the left end of the feed shaft 205 is coaxially connected to the right end of the inner mold 4 with sieve holes, and the right end of the feed shaft 205 is rotatably connected to the first port of the three-way component 501 through the connecting flange 503.

[0036] The forming box 3 includes an upper box body 301, a lower box body 302, a sealing strip 303, a support bracket 304, a flip telescopic assembly 305 and a pressing telescopic assembly 306. The flip telescopic assembly 305 and the pressing telescopic assembly 306 can adopt telescopic cylinders. The box body 301 and the lower box body 302 are arranged up and down, and the lower box body 302 is relatively fixedly arranged on the top of the support bracket 304. The sealing strip 303 is placed between the upper box body 301 and the lower box body 302; an overflow port 311 is arranged at the upper part of the upper box body 301, and a drain port 312 is arranged at the lower part of the lower box body 302. The support bracket 304 is used to support the lower box body 302, the pressing telescopic assembly 306 and the flip telescopic assembly 305; the upper box body 301 and the lower box body 302 are docking structures, and different lengths can be added by adding different box body parts to form different lengths to adapt to different lengths of the inner mold 4 with sieve holes. Multiple groups of flip telescopic components 305 are arranged in a line along the axis direction of the inner mold with sieve holes 4 and placed on the support frame 304. The telescopic ends of the flip telescopic components 305 are hinged to the upper box body 301, and the fixed ends of the telescopic ends of the flip telescopic components 305 are hinged to the support frame 304. Multiple groups of compression telescopic components 306 are arranged in a line along the axis direction of the inner mold with sieve holes 4 and placed on the support frame 304 at equal intervals. The flip telescopic components 305 and the compression telescopic components 306 are respectively located at the front and rear sides of the molding box 3.

[0037] The inner mold 4 with sieve holes is inside the molding box 3. The inner mold 4 with sieve holes includes an inner mold 4. Any number of inner molds are connected end to end to form inner molds 4 with sieve holes of different lengths, which is convenient for producing composite filter cartridges of different specifications. The left and right ends of the inner mold 4 with sieve holes are respectively connected to the driving shaft 204 and the feed shaft 205.

[0038] The feeding mechanism 5 includes a three-way component 501 (three-way valve), a fixing seat 502 and a connecting flange 503. The first port of the three-way component 501 is connected to the connecting flange 503, the second port of the three-way component 501 is connected to the water pipe, and the third port of the three-way component 501 is connected to the fiber material pool. The connecting flange 503 has a bearing and a sealing ring inside, which can realize the function of rotating at the left end and fixing at the right end; the connecting flange 503 is connected to the right end of the feeding shaft 205, and the fixing seat 502 is connected to the first port of the three-way component 501, so as to realize the movable connection between the three-way component 501 and the feeding shaft 205.

[0039] The movable adjustment mechanism 6 includes a base 601, a slider 602 and a guide rail 603. The guide rail 60 is relatively fixed, and the slider 602 slides linearly along the axis direction of the inner mold 4 with sieve holes on the guide rail 60. The base 601 is fixed on the top of the slider 602. The rotating mechanism 2 and the feeding mechanism 5 are placed on the base 601. The whole device can be moved and adjusted to produce composite filter cartridges of different lengths and specifications.

[0040] According to the composite filter cartridge of corresponding specifications, a number of inner molds 4 are selected to be connected end to end to form an inner mold 4 with sieve holes. According to the length of the inner mold 4 with sieve holes, the upper box 301 and the lower box 302 are increased with a corresponding number of box parts for adaptation; the moving adjustment mechanism 6 drives the rotating mechanism 2 and the feeding mechanism 5 on the right to move for adaptation.

[0041] The negative pressure clamping mechanism 8 is placed above the forming box 3 and is used to clamp the composite filter cartridge after centrifugal forming. The formed composite filter cartridge / inner mold with sieve holes 4 is taken out from the forming box 3 by the negative pressure clamping mechanism 8 for subsequent drying operations.

[0042] like Figure 2 As shown, the feed shaft 205 is a tube structure, and the external water is transported to the inside of the inner mold 4 with sieve holes through the second port of the tee component 501 and the feed shaft 205 in sequence; the external fiber mixture is transported to the inside of the inner mold 4 with sieve holes through the third port of the tee component 501 and the feed shaft 205 in sequence.

[0043] Working principle: like Figure 4As shown, the extension of the flip telescopic component 305 drives the upper box body 301 to flip and cover the top opening of the lower box body 302 to form an internal hollow box structure, and the sealing strip 303 is used to improve the sealing between the upper box body 301 and the lower box body 302; then the compression telescopic component 306 is shortened and its output end is abutted against the upper box body 301, so that the upper box body 301 is compressed against the lower box body 302.

[0044] The driving motor 101 drives the first pulley 105 to rotate. The first pulley 105 rotates through the belt 107 and the second pulley 106 to drive the driving shaft 204 to rotate. The driving shaft 204 rotates to drive the inner mold with sieve holes 4 to rotate in the molding box 3.

[0045] Molding process: The fiber mixture is prepared in different proportions according to different finished product requirements and according to the characteristics of the centrifugal molding process. The main components include fiber, aggregate, silica sol, alumina, and water. The above substances are added to the mixing tank in a certain proportion and stirred evenly at a speed greater than 120r / min, and then the dispersant solution is added, and then stirred at a low speed of less than 30r / min to obtain the fiber mixture A, and then left to stand for a period of time, and then the supernatant is removed, and then the dispersant powder is added and stirred intermittently at a low speed to obtain the fiber mixture B. The viscosity between the fibers is small, and it is not easy to settle and stratify, so that the centrifugal force is sufficient to overcome the viscosity and deadweight of the fiber to achieve molding. It is sent to the inner mold 4 with sieve holes of the molding box 3 filled with water through the feeding mechanism 5. Taking advantage of the characteristics of the fiber being small and light, not easy to settle and evenly distributed, it is evenly distributed again under the action of the water flow in the molding box 3.

[0046] Water injection stage: before molding, fill the molding box 3 with water, the mold speed is 0r / min, and the time is 0.5~1min; Mixing stage: Then start the drive motor 101, and the mold speed is evenly increased from 0r / min to 130r / min for 0.5-1min. At the same time, the fiber mixture is injected into the inner mold 4 with sieve holes of the molding box 3, and the injection is completed; Centrifugal stage: Increase the mold speed to 1000r / min for 3-4min; Dehydration stage: Increase the mold speed to 1200~1500r / min for 0.5~1min.

[0047] During the centrifugal feeding process from low speed to high speed, the fiber mixture is secondary mixed and distributed in the water of the inner mold with mesh 4 by centrifugal force, and the water in the fiber mixture is discharged through the mesh of the inner mold with mesh 4 under the action of centrifugal force, and discharged through the overflow port 311 at the top of the forming box 3. After the injection is completed, high-speed centrifugal molding is continued for about 2 minutes to fully dry the water in the composite filter cartridge, and at the same time, the overflow port 311 at the top of the forming box 3 is closed and the drain port 312 at the bottom is opened, and the water in the forming box 3 is discharged through the drain port 312.

[0048] The mesh size of the inner mold with mesh holes 4 is designed according to the volume of the fiber mixture, the length of the mold, and the balanced matching of the molding speed to ensure the balance of the material distribution, centrifugal molding and drainage rate at the speed, and avoid uneven material distribution, blockage, etc. caused by too fast or too slow sedimentation speed in the material distribution and molding stages. Taking the composite filter cartridge with an outer diameter of 150mm and an inner diameter of 110mm as an example, the mesh size of the inner mold with mesh holes 4 is 0.5mm-0.8mm.

[0049] During the fabric forming process, the fibers, powder, etc. in the fiber mixture are evenly distributed layer by layer on the inner surface of the mold by centrifugal force. As the fibers are stably stacked layer by layer, the finished product has the characteristics of high uniformity and obvious layered structure. In the low-speed stage, the device overcomes the influence of the slurry gravity, so that the slurry is evenly distributed in the water of the molding box 3 without causing excessive dispersion of the fibers; there is no feed shaft to distribute the material, avoiding the wear problem between the material shaft and the fiber. In the high-speed stage, under the action of centrifugal force, the material not only overcomes gravity but also overcomes the sedimentation resistance and friction resistance between the fibers and is centrifugally compacted, discharges excess water, loses fluidity, and is formed in the mold. At the same time, the PLC program linearly controls the speed to the maximum speed to avoid the relative centrifugal force between the fiber material layers deviating from the linear range and causing stratification. The filter cartridge formed by high-speed centrifugation has uniform wall thickness; the inner and outer surfaces are free of pits, neat and not rough, and no secondary grinding is required; the molding time is short and the production efficiency is high; there is no wear between the mold and the fiber, and the equipment maintenance is low.

[0050] Taking the composite filter cartridge with an outer diameter of 150mm and an inner diameter of 110mm as an example, at a speed of 1000r / min, the relative centrifugal force on the outer surface is 85G, and the relative centrifugal force on the inner surface is 62G. The relative centrifugal force from the outside to the inside gradually decreases, and the fiber layer density decreases from the outside to the inside. A dense fiber layer will be formed on the outside of the filter cartridge, which has a higher interception rate for fine dust particles, and the pores between the internal fibers are larger, and the overall pressure drop of the filter cartridge is reduced. Compared with the original vacuum external filtration type filter cartridge, the overall pressure drop is reduced by about 38.8%. It can reduce the operating energy consumption of the filter cartridge dust removal equipment and has high economic benefits.

[0051] like Figure 7As shown, a double-helix reinforced skeleton net 9 can be placed in the inner mold 4 with sieve holes. The reinforced skeleton net 9 is made of high-temperature resistant materials such as stainless steel, glass fiber, and carbon fiber. The double-helix reinforced skeleton net 9 can effectively absorb thermal expansion under high-temperature conditions. The reinforced skeleton net 9 and the fiber are interwoven and centrifugally formed to form a composite filter cartridge. While achieving a longer composite filter cartridge, the reinforced skeleton net 9 supports and protects the composite filter cartridge. The composite filter cartridge prepared by the reinforced skeleton net 9 is suitable for earthquake-prone areas and has no obvious stress concentration area. Its comprehensive displacement is 13%-23% lower than that of the composite filter cartridge without the reinforced skeleton net 9. The relative deviation of the displacement from top to bottom is low, which can effectively reduce the external vibration damage caused by low-frequency earthquakes, blowing, and uneven airflow.

[0052] The rotation of the driving shaft 204 and the feed shaft 205 adopts the form of double-row cylindrical rollers with back-to-back angular contact bearings, which effectively solves the problem of large shaft end runout and difficulty in coaxiality adjustment at a speed of 1000r / min of the molding machine, and provides stability for the molding of the filter cartridge.

[0053] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0054] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A composite filter cartridge centrifugal forming process, characterized in that: The following steps are involved: Filling the molding box (3) with water; The fiber mixture is then injected into the inner mold (4) with a sieve hole in the molding box (3), and during this process, the rotation speed of the inner mold (4) with a sieve hole is gradually increased from low to high; The fiber mixture is mixed and distributed in the water of the inner mold with sieve holes (4) by centrifugal force, and the water in the fiber mixture is discharged through the sieve holes of the inner mold with sieve holes (4) under the action of centrifugal force to form a composite filter cartridge.

2. The centrifugal forming process of a composite filter cartridge according to claim 1, characterized in that: During the process of injecting the fiber mixture into the inner mold with sieve holes (4), the rotation speed of the inner mold with sieve holes (4) is uniformly increased from 0 r / min to 130 r / min; During the centrifugation process, the rotation speed of the inner mold with sieve holes (4) is above 1000 r / min.

3. The centrifugal forming process of a composite filter cartridge according to claim 1, characterized in that: A reinforcing skeleton net (9) is placed inside the inner mold with sieve holes (4); the reinforcing skeleton net (9) is in a double helix structure; and the reinforcing skeleton net (9) is made of high temperature resistant material.

4. A composite filter cartridge centrifugal forming device, characterized in that: A composite filter cartridge centrifugal forming process according to any one of claims 1 to 3, comprising: A molding box (3) having an overflow port (311) at the top and a drain port (312) at the bottom; An inner mold with a sieve hole (4) is arranged inside the molding box (3); A driving mechanism (1) drives the inner mold with sieve holes (4) to rotate via a rotating mechanism (2); The feeding mechanism (5) is movably connected to the inner mold with sieve holes (4) and is used to transport the water and fiber mixture into the inner mold with sieve holes (4).

5. A composite filter cartridge centrifugal forming device according to claim 4, characterized in that: The molding box (3) comprises an upper box body (301), a lower box body (302), a sealing strip (303) and a flipping and telescopic assembly (305); the flipping and telescopic assembly (305) drives the upper box body (301) to flip to cover or separate the lower box body (302); the sealing strip (303) is arranged on the abutting surface of the upper box body (301) and the lower box body (302).

6. A composite filter cartridge centrifugal forming device according to claim 4, characterized in that: The rotating mechanism (2) comprises a bearing seat (201), an adjustment mechanism (202), a driving shaft (204) and a feeding shaft (205); one end of the inner mold with sieve holes (4) is transmission-connected to the driving mechanism (1) via the driving shaft (204), and the other end of the inner mold with sieve holes (4) is movably connected to the feeding mechanism (5) via the feeding shaft (205); the adjustment mechanism (202) is used to drive the corresponding bearing seat (201) to move along the radial direction of the inner mold with sieve holes (4); the driving shaft (204) and the feeding shaft (205) are rotationally connected to the corresponding bearing seat (201).

7. A composite filter cartridge centrifugal forming device according to claim 6, characterized in that: The feeding mechanism (5) comprises a fixing seat (502) and a three-way assembly (501) mounted on the fixing seat (502); a first port of the three-way assembly (501) is coaxially movably connected to a feeding shaft (205) and is interconnected; and a second and third ports of the three-way assembly (501) are respectively arranged as a water inlet and a feeding port.

8. A composite filter cartridge centrifugal forming device according to claim 6, characterized in that: The driving mechanism (1) comprises a motor seat (102) and a driving motor (101) mounted on the motor seat (102); the driving motor (101) is connected to a driving shaft (204) via a belt transmission assembly.

9. A composite filter cartridge centrifugal forming device according to claim 4, characterized in that: The inner mold with sieve holes (4) comprises more than one group of inner molds connected end to end in sequence.

10. A composite filter cartridge centrifugal forming device according to claim 9, characterized in that: It also comprises a movable adjustment mechanism (6), the movable adjustment mechanism (6) comprising a base (601), a guide rail (603) fixed on the base (601), and a slider (602), the feeding mechanism (5) being movable and matched on the guide rail (603) along the rotation axis direction of the inner mold with sieve holes (4) via the slider (602).

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