Filtering device for norfloxacin production

Abstract

The application relates to the technical field of norfloxacin production, and particularly discloses a filtering device for norfloxacin production, which comprises a hole-diffusing mechanism arranged in the interior of a filter cartridge and used for diffusing holes of filter cloth, the hole-diffusing mechanism is located below the filter cloth, the hole-diffusing mechanism comprises a gas conveying part used for conveying gas and a hole-diffusing part used for conveying the gas to the filter cloth, the hole-diffusing part is installed on the gas conveying part and communicates with the gas conveying part, and the hole-diffusing part is provided with air outlet holes used for discharging the gas to the filter cloth; the filtering device for norfloxacin production of the application conveys the air into the hole-diffusing part through the gas conveying part, the air in the hole-diffusing part blows to the filter cloth under the guidance of the air outlet holes, so that the air passes through the filter holes on the filter cloth, the hole-diffusing operation on the filter holes on the filter cloth is realized, the filtering efficiency of the raw material mixture is improved, the filter cloth does not need to be frequently replaced, and the working efficiency of the filtering device is improved.

Description

Technical Field

[0001] This invention relates to the field of norfloxacin production technology, and more specifically to a filtration device for norfloxacin production. Background Technology

[0002] Norfloxacin, a core representative of third-generation quinolone antibacterial drugs, achieves potent and broad-spectrum antibacterial effects through the synergistic effect of its carboxylic acid group and piperazine ring in its molecular structure by inhibiting bacterial DNA gyrase activity. Clinically, it is widely used in the treatment of urinary tract infections, intestinal inflammation, and skin and soft tissue infections. In its industrial synthesis, this drug employs a multi-step reaction system starting with o-dichlorobenzene. A typical process includes: first, constructing an intermediate through the condensation reaction of triethyl orthoformate and diethyl malonate; then, forming a quinolone core through key steps such as cyclization, hydrolysis, and decarboxylation; and finally, introducing a piperazine group to complete the molecular construction. In this complex reaction pathway, incompletely converted o-dichlorobenzene, residual catalyst, and byproducts, among other organic contaminants, must be separated and removed using filtration devices.

[0003] Existing filtration devices mainly consist of a filter cartridge, filter cloth, discharge pipe, and detection pipe (see reference). Figure 1 As shown in the diagram, the filter cloth is vertically inserted into the filter cylinder in a detachable manner to form a cylindrical filter unit. The discharge pipe is fixed to the tapered end of the filter cylinder using a flange connection. Its inner wall is mirror-polished to reduce material adhesion. It is used to guide the raw liquid after solid-liquid separation to the downstream treatment equipment by gravity. The detection pipe is embedded in the middle section of the discharge pipe with a T-shaped tee structure. Its diameter is one-third to one-fifth of the main discharge pipe. A regulating control valve with a visual scale is installed in series on the detection pipe. When sampling and testing are required, the operator can open the control valve to divert part of the raw liquid into the detection pipe at a linear velocity of 0.5-2 m / s. This allows for the real-time acquisition of representative filtered samples without affecting the main conveying process, facilitating rapid detection of key indicators such as turbidity and suspended solids content, and effectively monitoring the operating efficiency of the filtration system.

[0004] In actual operation, the raw material mixture to be processed is first quantitatively fed into the filter cylinder through the inlet. Inside the filter cylinder, the filter cloth adheres tightly to its inner wall under pressure, forming an effective filtration barrier. When the raw material mixture comes into full contact with the filter cloth, the solid particles, due to their larger particle size than the filter cloth's pores, are trapped on the filter cloth surface, gradually accumulating to form a dense filter cake layer. The clarified raw material liquid, after filtration, passes through the microporous structure of the filter cloth under the combined action of gravity and pressure difference. Subsequently, the filtered raw material liquid is continuously transported to the next processing equipment at a stable flow rate through the discharge pipe. When quality monitoring of the filtration effect is required, the operator can easily open the control valve installed on the detection pipe, diverting a portion of the raw material liquid from the main discharge pipe. This diverted liquid is then guided through the detection pipe to a dedicated detection container. By performing real-time analysis of key indicators such as turbidity and suspended solids content on the collected samples, the current operating status and separation efficiency of the filtration system can be quickly assessed.

[0005] However, the above-mentioned existing technologies still have the following shortcomings: as the filtration process progresses, the solid raw materials in the raw material mixture gradually accumulate on the surface of the filter cloth, and due to the continuous flow of the raw material liquid in the raw material mixture, they adhere tightly to the filter cloth. This accumulation will cause the solid raw materials to tightly block the filter pores of the filter cloth, requiring frequent replacement of the filter cloth, which can easily reduce the working efficiency of the filtration device. Summary of the Invention

[0006] This invention provides a filtration device for norfloxacin production, aiming to solve the problem in related technologies where the raw material liquid in the raw material mixture adheres tightly to the filter cloth due to continuous flow. This accumulation causes the solid raw material to tightly block the filter cloth pores, requiring frequent replacement of the filter cloth and easily reducing the working efficiency of the filtration device.

[0007] The filtration device for norfloxacin production of the present invention includes a filter cartridge and a filter cloth, the filter cloth being inserted into the filter cartridge. It also includes a perforation mechanism disposed inside the filter cartridge for perforating the filter cloth. The perforation mechanism is located below the filter cloth. The perforation mechanism includes a gas conveying component for conveying gas and a perforation component for conveying gas to the filter cloth. The perforation component is mounted on and communicates with the gas conveying component. The perforation component is provided with an outlet hole for discharging gas to the filter cloth.

[0008] Beneficial effects: When filtering a raw material mixture, the mixture is first injected into the filter cartridge. The mixture is blocked by the filter cloth, causing solid materials to be retained at the top of the cloth, while the liquid material continues to flow downwards through the cloth. As the filtration process progresses, solid materials gradually accumulate at the top of the cloth. The continuous flow of liquid material further clogs the filter cloth's pores. To avoid frequent cloth replacements, air is supplied to the perforation unit. Guided by the outlet, the air is blown onto the filter cloth, allowing it to pass through the pores and thus improve the filtration efficiency. This eliminates the need for frequent cloth replacements and increases the overall efficiency of the filtration device.

[0009] Preferably, the perforated component is configured as a plurality of components, each component including a housing, an air outlet being disposed on the housing, and an air conveying component including a branch pipe for conveying gas into the plurality of perforated components, with the housings on the plurality of perforated components respectively fitted onto the plurality of branch pipes.

[0010] Its effect is that the gas is delivered to multiple housings by multiple branch pipes on the gas delivery component. The gas entering the housing is discharged onto the filter cloth through the gas outlet, which can realize the pore-opening operation of the filter cloth, eliminating the need for frequent filter cloth replacement and improving the working efficiency of the filtration device.

[0011] Preferably, a support member for supporting the filter cloth is fixedly connected inside the filter cartridge. The support member includes a support part, a fixing ring, and a reinforcing mesh. The support part is fixedly connected inside the filter cartridge, and multiple fixing rings are provided. The reinforcing mesh and multiple fixing rings are all fixedly connected to the support part. The part of the filter cloth containing the raw material mixture can sink out from the fixing ring to form a recess.

[0012] Its effect is that the filter cloth can be supported to a certain height through the support components.

[0013] Preferably, the multiple branch pipes are located below the multiple fixing rings, and the multiple branch pipes are coaxially arranged with the multiple fixing rings.

[0014] Preferably, the perforation mechanism further includes a pusher for moving the plurality of perforated elements upward, the pusher being installed inside the filter cartridge.

[0015] Its effect is that the pusher moves the porous part upward so that the porous part can fit into the recess on the filter cloth, so that the gas can pass through the recess on the filter cloth and enhance the porous effect on the filter cloth.

[0016] Preferably, the perforated component further includes a plurality of partitions arranged sequentially from top to bottom. The plurality of partitions are fixedly connected inside the housing and are sleeved on the branch pipe. The plurality of partitions can divide the interior of the housing into a plurality of cavities, and the plurality of cavities can be connected to a plurality of air outlets by the obstruction of the branch pipe.

[0017] The effect is that during the upward movement of the housing, the branch pipes can deliver air into multiple cavities one by one and in an orderly manner from top to bottom. This ensures that only those air outlets that are in close contact with the filter cloth will open the blowing mode, accurately spraying the airflow onto the filter cloth surface. For those air outlets that are not in contact with the filter cloth, they remain closed to avoid ineffective blowing. This enhances the airtightness of the effective blowing area of ​​the filter cloth and effectively prevents energy loss and efficiency reduction caused by air leakage. Through this optimized design, not only is the accuracy of the pore-opening operation improved, but the overall working stability is also significantly enhanced, providing a strong guarantee for the long-term efficient operation of the filtration device.

[0018] Preferably, the perforated component further includes a connecting part and an insert rod. The connecting part is fixedly connected inside the housing and is coaxially arranged with the branch pipe. The insert rod is fixedly connected to the connecting part. A spiral groove is provided on the inner wall of the branch pipe, and the end of the insert rod away from the connecting part is inserted into the spiral groove.

[0019] Its effect is as follows: when the housing moves upward, it drives the connecting part and the insert rod connected to it to rise together. During this process, the insert rod slides along the preset spiral groove. This design allows the insert rod to generate rotational motion while rising. The insert rod transmits this rotational power to the housing through the connecting part, driving the housing to rotate. As the housing continues to rotate, the position of the air outlet on it also changes continuously, so that it can alternately blow air onto different areas of the filter cloth. This dynamic method of changing the air blowing position effectively avoids the excessive loosening or damage of the filter cloth part that may be caused by long-term blowing at a single position. At the same time, it ensures that all parts of the lifted filter cloth can receive uniform and sufficient porosity treatment, enhances the overall porosity effect of the filter cloth, and improves the performance and stability of the filtration device.

[0020] Preferably, the perforated component further includes a sealing part, which is fixedly connected inside the housing and sleeved on the top end of the branch pipe.

[0021] Its effect is that the branch pipe can be blocked by the sealing part, so that the branch pipe will not deliver air into the uppermost cavity before the shell moves up and contacts the recessed part.

[0022] Preferably, the perforated component further includes a top cover, which is rotatably connected to the top of the housing. The top cover is frustoconical and is adapted to the housing.

[0023] Its effect is as follows: by adopting a frustum-shaped shell structure, when the filter cloth is subjected to the lifting force of the shell, its surface will be correspondingly lifted and form a stable frustum protrusion. This geometric design not only utilizes the natural guiding characteristics of the cone structure, allowing the filter cloth to fit more smoothly and tightly with the outer contour of the shell during deformation, but also increases the effective contact area between the shell and the filter cloth. With the increase of the contact area, the force applied by the shell to the filter cloth is more evenly distributed, thereby more effectively penetrating the gaps between the filter cloth fibers, loosening and removing the particles or blockages accumulated therein, and ultimately achieving the purpose of enhancing the porous effect of the filter cloth, ensuring the high efficiency and stability of the filtration process.

[0024] The top cover is mounted on top of the housing via a rotating connection structure. This design allows the top cover to rotate flexibly and smoothly relative to the housing. When the recessed part is pushed upward, the top cover plays a unique isolating role, effectively separating the top of the housing from the recessed part of the filter cloth. This reduces the resistance generated by direct contact between the housing and the filter cloth during the rotation of the housing, thereby enhancing the smoothness and stability of the housing rotation. At the same time, the presence of the top cover also reduces the friction force generated by the housing on the filter cloth during rotation, effectively protecting the filter cloth from unnecessary wear, extending the service life of the filter cloth, and ensuring the efficient and stable operation of the entire filtration device.

[0025] Preferably, the pusher includes a bracket, a telescopic part, and a support. The bracket is fixedly connected inside the filter cartridge, the telescopic part is fixedly connected to the bracket, and the support is fixedly connected to the telescopic end of the telescopic part. Multiple branch pipes pass through the support, and the top of the support contacts the bottom of the housing.

[0026] Its effect is that the telescopic part pushes the bracket upward, and when the bracket moves upward, it can push multiple perforated parts upward, thereby providing power for the upward movement of the perforated parts.

[0027] The beneficial effects of this invention are:

[0028] 1. By driving multiple perforated components vertically upward through the pusher, the housing is raised synchronously and a portion of the filter cloth is pulled to adhere to its outer surface. Then, the air supply component is activated to deliver compressed air to the inside of the housing through the branch pipe. Multiple sets of air outlets blow air outward in a directional manner to form a pulse airflow and effectively clear the filter cloth pores, thereby significantly improving the permeation rate and separation efficiency of the raw material mixture during the filtration process and improving the working efficiency of the filtration device.

[0029] 2. The axial displacement of the frustoconical shell lifts the filter cloth to form a conical protrusion, which not only makes the filter cloth fit tightly against the outer wall of the shell, but also enhances the porous effect by increasing the contact area, thereby improving the filtration efficiency.

[0030] 3. Under the influence of gravity, the filter cloth naturally sinks into the fixing ring to form a recess, which provides the necessary space for the subsequent operation of the shell to lift part of the filter cloth upward.

[0031] 4. During the upward movement of the housing, the branch pipes deliver air to each cavity from top to bottom, causing the air outlets that are in contact with the filter cloth to blow air in a directional manner, while the air supply to the uncontacted parts stops, effectively enhancing the airtightness of the blowing area, avoiding air leakage, and thus significantly improving the overall working stability.

[0032] 5. When the shell moves upward, it drives the connecting part and the insert rod to move upward synchronously. The insert rod slides along the spiral groove and drives the connecting part to rotate. In turn, the connecting part drives the shell to rotate, realizing the periodic change of the blowing position, thereby evenly covering the surface of the filter cloth and effectively improving the porosity effect.

[0033] 6. The top cover effectively isolates the top of the housing from the recessed part of the filter cloth, significantly reducing the filter cloth resistance caused by lifting the recessed part when the housing rotates, thereby improving the rotational stability of the housing and reducing the frictional loss between the filter cloth and the housing. Attached Figure Description

[0034] Figure 1 This is a three-dimensional structural diagram of a filtration device used in the production of norfloxacin in the prior art.

[0035] Figure 2 This is a schematic diagram of the main structure of the present invention.

[0036] Figure 3 This is a three-dimensional structural diagram of the present invention.

[0037] Figure 4 This is a schematic diagram of the front cross-sectional structure of the present invention.

[0038] Figure 5 This is a three-dimensional structural diagram of the support member and the perforated mechanism of the present invention.

[0039] Figure 6 This is a schematic diagram of the main structure of the perforated mechanism of the present invention.

[0040] Figure 7 This is a front view structural schematic diagram of the perforated component and the pusher component of the present invention.

[0041] Figure 8 This is a cross-sectional structural diagram of the perforated mechanism of the present invention.

[0042] Figure label:

[0043] 1. Filter cartridge; 2. Filter cloth; 21. Recessed part; 3. Discharge pipe; 4. Detection pipe; 5. Control valve; 6. Support component; 61. Support part; 62. Fixing ring; 63. Reinforcing mesh; 7. Perforation mechanism; 71. Air conveying component; 711. Main pipe; 712. Branch pipe; 713. Spiral groove; 72. Perforation component; 721. Shell; 722. Air outlet; 723. Separator; 724. Sealing part; 725. Connecting part; 726. Insert rod; 727. Top cover; 73. Pushing component; 731. Bracket; 732. Telescopic part; 733. Bracket. Detailed Implementation

[0044] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0045] like Figures 2 to 8 As shown, the filtration device for norfloxacin production of the present invention includes a filter cylinder 1, a filter cloth 2, a discharge pipe 3, a detection pipe 4, a control valve 5, a support member 6, and a perforation mechanism 7. The filter cloth 2 is inserted into the filter cylinder 1 and is cylindrical with a closed bottom. When filtering a raw material mixture, the mixture is injected into the filter cloth 2 for filtration. The support member 6 is connected inside the filter cylinder 1 and supports the filter cloth 2 so that its bottom does not adhere to the filter cylinder 1, facilitating filtration of the raw material mixture. The support member 6 also allows the filter cloth 2 to form multiple recesses 21 during filtration, providing leeway for the perforation mechanism 7 when it perforates the filter cloth 2. The discharge pipe 3 is fixedly connected to the bottom of the filter cylinder 1 and transports the filtered raw material liquid to the next processing equipment for further processing. The detection pipe 4 is fixedly connected to the discharge pipe 3, and the control valve 5 is installed on the detection pipe 4. Through the cooperation of the detection pipe 4 and the control valve 5, the filtered raw material liquid can be obtained for testing. The perforation mechanism 7 is installed inside the filter cartridge 1. The perforation mechanism 7 can push the recessed part 21 upward to form a frustum-shaped protrusion. At the same time, air is blown onto the frustum-shaped protrusion to perforate the filter cloth 2, thereby improving the filtration efficiency of the raw material mixture.

[0046] During the filtration of the raw material mixture, the mixture is first fed into the filter cloth 2. Under gravity, the liquid components in the mixture continuously permeate, causing multiple recesses 21 to form on the surface of the support 6, while solid particles are trapped above the filter cloth 2. After solid-liquid separation, the raw liquid is directionally transported to the next processing equipment through the discharge pipe 3. As the filtration process continues, solid raw materials accumulate on the surface of the filter cloth 2 and adhere tightly to it under the scouring action of the raw liquid. When the filter cloth 2 is found to be clogged, causing a decrease in filtration efficiency, the perforation mechanism 7 is activated to lift the recesses 21, causing the recesses 21 of the filter cloth 2 to bulge and form a frustum-shaped protrusion structure. The truncated cone protrusion gradually comes into complete contact with the contact surface of the perforated mechanism 7. At the same time, the perforated mechanism 7 generates a pulsed airflow and sprays the pulsed airflow into the filter cloth 2 area of ​​the truncated cone protrusion. The vibration effect generated by the high-speed airflow effectively removes the retained particles in the filter cloth 2 pores. Meanwhile, the expansion effect of the truncated cone structure further increases the effective filtration area of ​​the filter cloth 2, thereby improving the overall filtration efficiency of the raw material mixture.

[0047] like Figure 4 and Figure 5 As shown, the support member 6 includes a support portion 61, a fixing ring 62, and a reinforcing mesh 63. The support portion 61 is connected inside the filter cartridge 1 and is located below the filter cloth 2. Multiple fixing rings 62 are provided, and the reinforcing mesh 63 and multiple fixing rings 62 are all fixedly connected to the support portion 61. The reinforcing mesh 63 can strengthen the overall strength of the support member 6, and the mesh size of the reinforcing mesh 63 is much larger than the filter pores on the filter cloth 2, so as to avoid the reinforcing mesh 63 causing too much obstruction to the raw material liquid passing through the filter cloth 2. The support portion 61, the fixing ring 62, and the reinforcing mesh 63 can form a support for the filter cloth 2. After the raw material mixture is transported onto the filter cloth 2, under the action of gravity of the raw material mixture, the filter cloth 2 sinks into the fixing ring 62 to form a recess 21. The recess 21 is a part of the filter cloth 2 that can be lifted by the pore-reducing mechanism 7, thereby providing a margin for the pore-reducing mechanism 7 to lift the filter cloth 2.

[0048] like Figures 4 to 8As shown, the perforation mechanism 7 includes an air supply component 71, perforation components 72, and a pushing component 73. The air supply component 71 is connected inside the filter cartridge 1. Multiple perforation components 72 are provided, each sleeved on the air supply component 71. The multiple perforation components 72 are respectively arranged corresponding to multiple fixing rings 62. The pushing component 73 is connected inside the filter cartridge 1. The pushing component 73 can push the perforation components 72 upward and push the recessed portion 21, so that the recessed portion 21 gradually forms a frustum-shaped protrusion. The conical protrusion is attached to the outside of the perforation member 72 so that the filter cloth 2 can be perforated by the perforation member 72. During the process of the perforation member 72 pushing the recessed part 21 upward, the air supply member 71 is activated to supply air into the perforation member 72. The perforation member 72 blows the air toward the filter cloth 2 that is attached to the perforation member 72 to form a pulse airflow and effectively clear the filter pores of the filter cloth 2, thereby performing the perforation operation on the filter cloth 2.

[0049] When performing the pore-reducing operation on the filter cloth 2, the pusher 73 is first activated, applying a thrust to move multiple pore-reducing components 72 upwards synchronously in the vertical direction. During the upward movement of the pore-reducing component 72, its top tip contacts the recessed portion 21 of the filter cloth 2 and applies a lifting force, causing the recessed portion 21 to gradually rise as the pore-reducing component 72 moves upwards, ultimately forming a frustum-shaped protrusion structure. Subsequently, the air supply component 71 is activated, delivering compressed air into the interior of each pore-reducing component 72. The high-speed airflow is then directed through the pore-reducing component 72 onto the surface of the filter cloth 2 in direct contact with it, effectively clearing the pores of the filter cloth 2.

[0050] Continue to refer to Figures 4 to 8 As shown, the air supply component 71 includes a main pipe 711 and branch pipes 712. The main pipe 711 is fixedly connected inside the filter cartridge 1 and is fixedly connected to an external air supply device, which is a pneumatic conveyor with a built-in air pump. Activating the external air supply device allows air to be supplied into the main pipe 711. Multiple branch pipes 712 are provided, each fixedly connected to the main pipe 711. Multiple perforated components 72 are respectively fitted onto the multiple main pipes 711. Air entering the main pipe 711 can be transported to the multiple perforated components 72 by the multiple branch pipes 712. The multiple branch pipes 712 are located below the multiple fixing rings 62 and are coaxially arranged with the multiple fixing rings 62, so that the multiple perforated components 72 are located directly below and coaxially arranged with the multiple recesses 21, thereby enhancing the fit between the multiple perforated components 72 and the raised portion of the recesses 21 after they move upwards.

[0051] During the pore-reducing operation of the filter cloth 2, the pusher 73 is first activated, applying an upward driving force to simultaneously lift multiple pore-reducing elements 72 vertically. As the pore-reducing elements 72 move upward, their tops contact the recesses 21 on the surface of the filter cloth 2, continuously applying a lifting force. This causes the recesses 21 to gradually bulge under mechanical thrust, forming frustum-shaped protrusions. Simultaneously, the external air supply equipment is activated, delivering compressed air through the main air pipeline to the main pipe 711 inside the pore-reducing mechanism 7. The compressed air entering the main pipe 711 is then diverted through multiple radially distributed branch pipes 712, each guided to its corresponding pore-reducing element 72. Finally, the compressed air is ejected through the pore-reducing elements 72, impacting the area of ​​the filter cloth 2 that is tightly fitted with it. This effectively removes solid particles embedded in the filter cloth 2's pores, significantly improving the filtration efficiency of the raw material mixture. Frequent replacement of the filter cloth 2 is unnecessary, thus increasing the working efficiency of the filtration device.

[0052] Continue to refer to Figures 4 to 8 As shown, the perforated component 72 includes a housing 721, a partition 723, a sealing part 724, a connecting part 725, an insert rod 726, and a top cover 727. The housing 721 is sleeved on the branch pipe 712, and the top end of the branch pipe 712 abuts against the inner top wall of the housing 721. The housing 721 is frustoconical in shape so that when the recessed part 21 is pushed upward, a frustoconical protrusion is formed, thereby increasing the contact area between the housing 721 and the filter cloth 2 and facilitating the fit between the filter cloth 2 and the housing 721. The housing 721 is provided with multiple sets of air outlets 722, which are arranged sequentially from top to bottom. Each set of air outlets 722 has multiple outlets, which are arranged in a ring and are inclined to prevent the raw material liquid passing through the filter cloth 2 from entering the housing 721 through the air outlets 722. Multiple partitions 723 are provided, arranged sequentially from top to bottom. All partitions 723 are fixedly connected inside the housing 721 and sleeved on the branch pipe 712. These partitions divide the interior of the housing 721 into multiple cavities. The branch pipe 712 blocks the airflow, allowing each cavity to connect to multiple sets of air outlets 722. When the housing 721 is pushed upwards, the branch pipe 712 delivers air from top to bottom into each cavity. This allows the air outlets 722 that are in contact with the filter cloth 2 to blow air into it, while those not in contact with the filter cloth 2 will not blow air. This enhances the airtightness of the effective air-blowing area of ​​the filter cloth 2, prevents leakage, and improves overall operational stability.

[0053] Continue to refer to Figures 4 to 8As shown, the sealing part 724 is fixedly connected to the inner top wall of the housing 721. The sealing part 724 is sleeved on the top end of the branch pipe 712. The sealing part 724 can seal the branch pipe 712, so that the branch pipe 712 will not supply air into the uppermost cavity before the housing 721 moves upward and contacts the recessed part 21. The sealing part 724 is located above the uppermost partition part 723, and the bottom of the sealing part 724 does not contact the top of the uppermost partition part 723. A spiral groove 713 is provided on the inner wall of the branch pipe 712. The connecting part 725 is fixedly connected to the inner top wall of the housing 721, and the connecting part 725 is coaxially arranged with the branch pipe 712. The insertion rod 726 is fixedly connected to the connecting part 725, and the end of the insertion rod 726 away from the connecting part 725 is inserted into the spiral groove 713. When the housing 721 moves upward, it causes the connecting part 725 and the insert rod 726 to move upward as well. The insert rod 726 slides along the spiral groove 713 as it moves upward, causing the connecting part 725 to rotate. The rotation of the connecting part 725, in turn, causes the housing 721 to rotate, thereby continuously changing the air blowing position of the housing 721 on the filter cloth 2 to enhance the porous effect on the filter cloth 2. The top cover 727 is rotatably connected to the top of the housing 721. The top cover 727 is frustoconical and fits the housing 721. The top cover 727 separates the top of the housing 721 from the recessed portion 21 of the filter cloth 2, reducing the resistance of the filter cloth 2 when the housing 721 rotates after the recessed portion 21 is pushed upward. This enhances the stability of the housing 721 during rotation and reduces the frictional force generated on the filter cloth 2 during rotation.

[0054] During the pore-reducing operation of the filter cloth 2, the pusher 73 pushes multiple pore-reducing elements 72 upwards, so that the top cover 727 first contacts the recessed portion 21 of the filter cloth 2. As the pore-reducing elements 72 continue to move upwards, the recessed portion 21 gradually forms a frustoconical protrusion. During this process, the filter cloth 2 gradually adheres to the outer side of the housing 721. The external air supply equipment is activated to deliver air into the main pipe 711, and the branch pipe 712 delivers the air entering the main pipe 711 from top to bottom into multiple cavities, so that multiple sets of air outlets 722 blow air onto the filter cloth 2 that adheres to them, thereby realizing the pore-reducing operation of the filter cloth 2. When the housing 721 moves upward, it causes the connecting part 725 and the insert rod 726 to move upward. When the insert rod 726 moves upward, it slides along the spiral groove 713, causing the insert rod 726 to drive the connecting part 725 to rotate. When the connecting part 725 rotates, it drives the housing 721 to rotate, thereby continuously changing the blowing position of the air outlet 722 on the filter cloth 2. The filter cloth 2 and the raw material mixture poured into the top of the filter cloth 2 can squeeze the top cover 727 so that the top cover 727 does not rotate with the housing 721.

[0055] Continue to refer to Figures 4 to 8As shown, the pusher 73 includes a bracket 731, a telescopic part 732, and a support 733. The bracket 731 is fixedly connected inside the filter cartridge 1 and is located below the main pipe 711. The telescopic part 732 is fixedly connected to the bracket 731. The telescopic part 732 can be a cylinder, an electric telescopic rod, or other components capable of automatic extension and retraction. In this embodiment, the telescopic part 732 is a cylinder with its telescopic end facing upwards. The support 733 is fixedly connected to the telescopic end of the telescopic part 732. Multiple branch pipes 712 pass through the support 733, and the top of the support 733 contacts the bottom of the housing 721. When the telescopic part 732 is activated, it pushes the support 733 upwards. When the support 733 moves upwards, it can push multiple perforated parts 72 upwards, thereby providing power for the upward movement of the perforated parts 72.

[0056] Working principle:

[0057] When filtering the raw material mixture, filter cloth 2 is first inserted into filter cylinder 1, and then the raw material mixture is conveyed into filter cloth 2. At this time, due to the gravity of the raw material mixture, filter cloth 2 forms multiple recesses 21 under the action of multiple fixing rings 62. The raw material liquid filtered by filter cloth 2 is conveyed to the next processing equipment through discharge pipe 3, while solid raw materials remain on filter cloth 2.

[0058] During the pore-reducing operation of the filter cloth 2, the telescopic part 732 is activated, which pushes the bracket 733 upward. As the bracket 733 moves upward, it pushes multiple pore-reducing components 72 upward. When the pore-reducing components 72 move upward, the top cover 727 first contacts the recessed portion 21 of the filter cloth 2. As the pore-reducing components 72 continue to move upward, the recessed portion 21 gradually forms a frustum-shaped protrusion. During this process, the filter cloth 2 gradually adheres to the outer side of the housing 721. The external air supply equipment is activated, delivering air into the main pipe 711. The branch pipe 712 then sequentially delivers the air entering the main pipe 711 from top to bottom into multiple cavities, so that multiple sets of air outlets 722 sequentially blow air onto the filter cloth 2 that adheres to them, thus achieving the pore-reducing operation of the filter cloth 2. When the housing 721 moves upward, it drives the connecting part 725 and the insert rod 726 to move upward. When the insert rod 726 moves upward, it slides along the spiral groove 713, causing the insert rod 726 to drive the connecting part 725 to rotate. When the connecting part 725 rotates, it drives the housing 721 to rotate, thereby continuously changing the blowing position of the air outlet 722 on the filter cloth 2. During this process, the filter cloth 2 and the raw material mixture poured into the top of the filter cloth 2 can squeeze the top cover 727 so that the top cover 727 will not rotate with the housing 721.

[0059] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A filtering device for norfloxacin production comprising a filter cartridge and a filter cloth, the filter cloth being inserted into the filter cartridge, characterized in that, It also includes a perforation mechanism disposed inside the filter cartridge for perforating the filter cloth. The perforation mechanism is located below the filter cloth. The perforation mechanism includes a gas conveying component for conveying gas and a perforation component for conveying gas to the filter cloth. The perforation component is mounted on and communicates with the gas conveying component. The perforation component is provided with an outlet hole for discharging gas to the filter cloth. The perforated component is configured as multiple components, each component including a housing, with an air outlet disposed on the housing. The gas conveying component includes a branch pipe for conveying gas into the multiple perforated components, and the housings on the multiple perforated components are respectively sleeved on the multiple branch pipes. The filter cartridge is fixedly connected to a support member for supporting the filter cloth. The support member includes a support part, a fixing ring and a reinforcing mesh. The support part is fixedly connected to the filter cartridge. Multiple fixing rings are provided. The reinforcing mesh and multiple fixing rings are fixedly connected to the support part. The part of the filter cloth containing the raw material mixture can sink out from the fixing ring to form a recess. The multiple branch pipes are respectively located below the multiple fixing rings, and the multiple branch pipes are respectively coaxially arranged with the multiple fixing rings; The perforation mechanism also includes a pusher for moving multiple perforation elements upward, the pusher being installed inside the filter cartridge; The porous component also includes multiple partitions arranged sequentially from top to bottom. These partitions are all fixedly connected inside the housing and sleeved on the branch pipe. The multiple partitions can divide the interior of the housing into multiple cavities. With the obstruction of the branch pipe, the multiple cavities can be connected to multiple sets of air outlets respectively. When the housing is pushed upward, the branch pipe can deliver air into the multiple cavities one by one from top to bottom. This allows the air outlets that are in contact with the filter cloth to blow air into the filter cloth, while the air outlets that are not in contact with the filter cloth will not blow air into the filter cloth.

2. The filtration device for norfloxacin production according to claim 1, characterized in that, The perforated component also includes a connecting part and an insert rod. The connecting part is connected inside the housing and is coaxially arranged with the branch pipe. The insert rod is fixedly connected to the connecting part. A spiral groove is provided on the inner wall of the branch pipe, and the end of the insert rod away from the connecting part is inserted into the spiral groove.

3. The filtration device for norfloxacin production according to claim 2, characterized in that, The perforated component also includes a sealing part, which is fixedly connected inside the housing and sleeved on the top end of the branch pipe.

4. The filtration device for norfloxacin production according to claim 3, characterized in that, The perforated component also includes a top cover, which is rotatably connected to the top of the housing. Both the housing and the top cover are frustoconical in shape, and the top cover is adapted to the housing.

5. The filtration device for norfloxacin production according to claim 1, characterized in that, The pusher includes a bracket, a telescopic part, and a support. The bracket is fixedly connected inside the filter cartridge, the telescopic part is fixedly connected to the bracket, and the support is fixedly connected to the telescopic end of the telescopic part. Multiple branch pipes pass through the support, and the top of the support is in contact with the bottom of the housing.

Images