Filtering device for medical intermediate production

Abstract

The invention relates to the technical field of solid-liquid separation equipment, in particular to a filter device for medical intermediate production, which comprises a filter tank body and a filter screen arranged in the filter tank body, a first mounting ring and a second mounting ring are arranged in the filter tank body, the diameter of the first mounting ring is larger than that of the second mounting ring, and the filter screen is arranged in the filter tank body. Filter cloth is arranged on the inner side of the filter screen, the filter cloth is attached to the inner wall of the filter screen, a plurality of first fixing rods used for fixing the upper end of the filter cloth are arranged on the first mounting ring, and a second fixing rod used for fixing the lower end of the filter cloth is arranged on the second mounting ring; a driving part for driving the second mounting ring to move up and down along the axis of the filtering tank body is arranged on the filtering tank body, and in the process that the driving part drives the second mounting ring to move downwards, the section of the filtering cloth is gradually reduced from top to bottom. The filter screen has the effect of reducing impurities entering the meshes of the filter screen.

Description

Technical Field

[0001] The present application relates to the technical field of solid-liquid separation equipment, and in particular to a filtering device for producing pharmaceutical intermediates. Background Art

[0002] Numerous industrial processes require the filtration of fluid media. Whether in the chemical, food and beverage, water treatment, or pharmaceutical industries, the effective removal of impurities, particulate matter, or other insoluble matter from fluids is crucial to ensure product quality, the proper functioning of production equipment, and the stability of process flows. In the production of pharmaceutical intermediates, scraper filters are used to filter solids and liquids. These filters typically consist of a rotating cylindrical screen and one or more scrapers. A solid-liquid mixture enters the screen through the filter's feed inlet, where solid particles are removed while the liquid passes through the screen, forming a suspended solid-liquid mixture. The scrapers, located on the screen's surface, rotate to remove solid matter. The scrapers scrape off any solid particles adhering to the screen, causing them to fall into a trough or other collection device at the bottom. These scraped solids are then transported to the equipment's discharge port for further processing or collection.

[0003] For example, the Chinese patent document with the announcement number CN218221324U discloses a scraper-type self-cleaning filter, including a filter cylinder, the top of the filter cylinder is connected to the filter top cover, a reducer is installed on the filter top cover through a bracket, the reducer is connected to the drive motor and the rotating shaft, the drive motor is connected to the controller, the controller is installed on the filter cylinder, the bottom of the rotating shaft penetrates into the interior of the filter cylinder and connects to the top of the central pipe, the top of the central pipe is closed and connected to the upper orifice plate through the rotating shaft, the bottom of the central pipe is connected to the lower orifice plate through the rotating shaft, the upper and lower orifice plates are installed in parallel inside the filter cylinder, the upper part of the filter cylinder is installed with a water inlet, and the lower part is installed with a water outlet. The water inlet and outlet are both connected to the interior of the filter cylinder. The water inlet is located above the upper orifice plate, and the water outlet is located between the upper and lower orifice plates. An annular filter screen is vertically installed between the upper and lower orifice plates. A scraper assembly and an inner nozzle are installed on the central pipe. The inner nozzle is connected to the central pipe and located inside the filter screen. A cleaning pipe is provided at the bottom of the central pipe. One end of the cleaning pipe is connected to the lower orifice plate and aligned with the central pipe. The other end of the cleaning pipe extends out of the filter cylinder. A sewage outlet is installed at the bottom of the filter cylinder. The outside of the filter cylinder is connected to the cleaning pipe I. An outer nozzle is installed on the inner wall of the filter cylinder. The outer nozzle is located outside the filter screen and connected to the cleaning pipe I. When cleaning the device, the solenoid valves on the water inlet and outlet are closed, the solenoid valve on the sewage outlet is opened, and the drive motor is started. The drive motor rotates the central pipe via the rotating shaft, which drives the scraper assembly to rotate, and the scraper of the scraper assembly scrapes and cleans the inner wall of the filter screen.

[0004] In the above-mentioned related technologies, the liquid can be filtered through the filter cartridge, but during the rotation of the scraper, some impurities on the inner wall of the filter cartridge will be scraped off by the scraper, and some impurities will be squeezed by the scraper. Some of the squeezed impurities will pass through the filter holes on the filter cartridge and enter between the shell and the outer wall of the filter cartridge, and some will stick to the filter holes. Then, during subsequent filtration, the flow of the liquid will impact the impurities stuck in the filter holes and enter between the shell and the filter cartridge. Some impurities will be discharged through the liquid outlet pipe, which will affect the filtering effect of the liquid. Summary of the Invention

[0005] The present application provides a filtering device for producing pharmaceutical intermediates, which aims to solve the problem of reducing the entry of impurities into the filter pores in the related art.

[0006] The present application provides a filtration device for producing pharmaceutical intermediates using the following technical solution: A filtering device for producing pharmaceutical intermediates includes a filter tank body and a filter screen arranged in the filter tank body, a first mounting ring and a second mounting ring are arranged in the filter tank body, the diameter of the first mounting ring is larger than the diameter of the second mounting ring, a filter cloth is arranged on the inner side of the filter screen, the filter cloth is attached to the inner wall of the filter screen, the first mounting ring is provided with a plurality of first fixing rods for fixing the upper end of the filter cloth, the second mounting ring is provided with a second fixing rod for fixing the lower end of the filter cloth, the filter tank body is provided with a driving member for driving the second mounting ring to move up and down along the axis of the filter tank body, and in the process of the driving member driving the second mounting ring to move downward, the cross-section of the filter cloth gradually becomes smaller from top to bottom.

[0007] By adopting the above technical solution, after the liquid enters the filter tank body, the liquid passes through the filter cloth and the filter screen in sequence. Then, impurities in the liquid are blocked by the filter cloth. After filtering for a period of time, it is necessary to clean the impurities attached to the filter cloth. At this time, the scraper rotates and scrapes off the impurities on the filter cloth. Since the filter pores on the filter cloth are small, the impurities in the liquid will not enter the filter screen. Then, the scraper does not push the impurities into the filter screen pores while scraping the impurities. After the impurities on the filter cloth are scraped off by the scraper, some impurities will still remain on the filter cloth. At this time, the second mounting ring is driven downward by the driving member. During the downward movement of the second mounting ring, the filter cloth is pulled downward. Since the diameter of the second mounting ring is smaller than that of the first mounting ring, the filter cloth no longer abuts the inner wall of the filter screen during the downward movement of the lower end of the filter cloth. At this time, the cross-section of the filter cloth gradually decreases in the downward direction, which facilitates the separation of impurities from the surface of the filter cloth. While cleaning the impurities on the filter cloth surface, the liquid can still be filtered, thereby improving the filtration efficiency of the liquid and reducing the entry of impurities into the mesh of the filter screen.

[0008] Optionally, a pushing assembly is provided between the filter cloth and the filter screen, and the pushing assembly is used to push the filter cloth toward the axial direction of the filter tank body; the pushing assembly includes a first pushing rod sliding on the first mounting ring and a second pushing rod hinged on the second mounting ring, and the second pushing rod is hinged on the first pushing rod at one end away from the second mounting ring. When the filter cloth abuts against the inner wall of the filter screen, the second pushing rod is tilted, and the tilted second pushing rod abuts against the inner wall of the filter screen. A plurality of the first pushing rods and the second pushing rods are provided, and the plurality of first pushing rods and the plurality of second pushing rods are arranged at intervals along the circumference of the filter tank body.

[0009] By adopting the above technical solution, during the downward movement of the second mounting ring, the first push rod will slide on the first mounting ring, and at the same time the second mounting ring will pull the second push rod downward, and then the second push rod will rotate from the inclined state to the vertical state. When the second push rod rotates to the vertical state, it will coincide with the axis of the first push rod. Since there are multiple first push rods and second push rods, during the movement of the first push rod toward the center of the filter tank body, the cross-section of the filter cloth will be polygonal, which will facilitate further shedding of impurities on the filter cloth.

[0010] Optionally, the first fixing rod is slidably connected to the first mounting ring along the diameter of the first mounting ring, and a first return spring is fixedly mounted on the first fixing rod, with one end of the first return spring away from the first fixing rod being fixed to the first mounting ring.

[0011] By adopting the above technical solution, when the first push rod pushes the filter cloth to move closer to the center of the filter tank body, the first fixing rod will also slide on the first mounting ring, and then the first return spring will be compressed, which can reduce the deformation of the filter cloth.

[0012] Optionally, a limiting rod is slidably connected to the first mounting ring, the first push rod is arranged on the limiting rod, and a second return spring for driving the first push rod to return to its original position is fixedly installed on the limiting rod, and one end of the second return spring is fixed on the first mounting ring.

[0013] By adopting the above technical solution, when the first push rod moves toward the center of the filter tank body, it will drive the limit rod to move toward the center of the filter tank body, and the second return spring will be compressed. When the second mounting ring moves upward, the second return spring will drive the limit rod to reset. At this time, both the first push rod and the second push rod are reset.

[0014] Optionally, the horizontal cross-section of the first push rod is set to be an ellipse, the first push rod is provided with a side surface with a large curvature and a side surface with a small curvature, and the first mounting ring is provided with a control component for driving the first push rod to rotate. During the rotation of the first push rod, the side surface with a small curvature on the first push rod gradually abuts against the surface of the filter cloth.

[0015] By adopting the above technical solution, when the limit rod moves, the control component will drive the first push rod to rotate. Since the first push rod is set to an elliptical structure, the filter cloth will be further tightened when the first push rod rotates, thereby facilitating the separation of impurities on the filter cloth.

[0016] Optionally, the control assembly includes a control block arranged on a first mounting ring and a control shaft fixed on the control block, the control block slides on the first mounting ring along the axial direction of the filter tank body, a connecting assembly is provided on the control block, the connecting assembly is used to connect the control block and the first push rod, and the limit rod is provided with a control groove for driving the control block to move up and down.

[0017] By adopting the above technical solution, since the control block is connected to the first push rod through the connecting assembly, the first push rod will be driven to rotate during the up and down movement of the control block, thereby facilitating the purpose of further tensioning the filter cloth.

[0018] Optionally, the control shaft is slidably connected in the control groove, and the control groove includes a first inclined portion and a second inclined portion, the first inclined portion gradually tilts upward in a direction approaching the second inclined portion, and the second inclined portion gradually tilts downward in a direction away from the first inclined portion.

[0019] By adopting the above technical solution, the first push rod will drive the limit rod to move simultaneously during the process of moving toward the center of the filter tank body, and then the control shaft on the control block will move from the first inclined portion to the second cleaning tank. During the movement, the control block moves from the lowest point to the highest point, and then from the highest point to the lowest point, which facilitates the rotation of the first push rod.

[0020] Optionally, the connecting assembly includes a connecting rod slidably connected to the control block and a connecting spring fixed to the control block, one end of the connecting spring is fixed to the connecting rod, a connecting groove is provided on the first push rod, the connecting groove is set as a spiral structure, and the connecting spring pushes the connecting rod to abut against the connecting groove.

[0021] By adopting the above technical solution, the connecting spring pushes the connecting rod into the connecting groove. Since the connecting groove is set as a spiral structure, when the control block drives the connecting rod to move up and down, it will drive the first push rod to rotate.

[0022] Optionally, a positioning rod is fixedly mounted on the first mounting ring, and the control block is slidably connected to the positioning rod.

[0023] By adopting the above technical solution, under the action of the positioning rod, the control block can slide more stably on the first mounting ring.

[0024] Optionally, five of the first pushing rods and five of the second pushing rods are provided.

[0025] By adopting the above technical solution, since there are five first push rods and five second push rods, the cross section of the upper end of the filter cloth can be made into a pentagon during the downward movement of the second mounting ring, which facilitates the falling of impurities on the filter cloth.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. Since the pores on the filter cloth are small, the filtered impurities will adhere to the filter cloth, and the impurities in the liquid will not enter the filter. Then, when the scraper scrapes off the impurities, it will not push the impurities into the pores of the filter, thus reducing the impurities from entering the filtered liquid. 2. As the second mounting ring moves downward, the first push rod slides on the first mounting ring, and at the same time, the second mounting ring pulls the second push rod downward. As the first push rod moves closer to the center of the filter tank body, the cross-section of the filter cloth becomes polygonal, which facilitates further shedding of impurities on the filter cloth. 3. When the first push rod pushes the filter cloth toward the center of the filter tank body, the first fixing rod will also slide on the first mounting ring, and then the first return spring will be compressed, which can reduce the deformation of the filter cloth. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0028] Figure 2 This is a cross-sectional view of the filter tank body of an embodiment of the present application.

[0029] Figure 3 This is a cross-sectional view of the filter screen according to an embodiment of the present application.

[0030] Figure 4 It is a schematic structural diagram of the filter cloth being pushed in an embodiment of the present application.

[0031] Figure 5 It is a schematic diagram of the structure of the pushing component of an embodiment of the present application.

[0032] Figure 6 This is a cross-sectional view of the first push rod of an embodiment of the present application.

[0033] Figure 7 It is a schematic diagram of the control component structure of an embodiment of the present application.

[0034] Figure markings: 01, filter tank body; 1, filter screen; 11, vertical part; 12, bending part; 2, first mounting ring; 21, second mounting ring; 22, filter cloth; 23, first fixing rod; 24, second fixing rod; 25, first return spring; 3, pushing assembly; 31, first pushing rod; 32, second pushing rod; 4, limiting rod; 41, second return spring; 5, control assembly; 51, control block; 52, control shaft; 6, control groove; 61, first inclined part; 62, second inclined part; 7, connecting assembly; 71, connecting rod; 72, connecting spring; 73, connecting groove; 8, mounting rod; 91, large curvature side; 92, small curvature side; 10, rotating ring. DETAILED DESCRIPTION

[0035] The following combination Figure 1-Figure 7 This application is described in further detail.

[0036] The present application discloses a filtering device for producing pharmaceutical intermediates. Figures 1 to 3 A filtering device for producing pharmaceutical intermediates includes a filter tank body 01 arranged on the ground, and the filter tank body 01 is provided with a liquid inlet pipe, a liquid outlet pipe and a discharge pipe, and the discharge pipe is used to discharge filtered impurities, and a filter screen 1 is arranged in the filter tank body 01, and a first mounting ring 2 and a second mounting ring 21 are provided on the filter screen 1, the first mounting ring 2 is arranged at the upper end of the filter screen 1, and the second mounting ring 21 is arranged at the lower end of the filter screen 1, and the diameter of the first mounting ring 2 is larger than the diameter of the second mounting ring 21, and the filter screen 1 is fixed to the filter tank body 01 through the first mounting ring 2 and the second mounting ring 21, and a filter cloth 22 is arranged on the inner side of the filter screen 1, the upper end of the filter cloth 22 is arranged on the first mounting ring 2, and the lower end is arranged on the second mounting ring 21, and the filter cloth 22 abuts against the inner wall of the filter screen 1. In this embodiment, the filter screen 1 and the filter cloth 22 are both arranged as an annular structure.

[0037] Reference Figures 1 to 4 The filter screen 1 includes a vertical portion 11 and a bent portion 12, and the filter cloth 22 also includes a vertical portion 11 and a bent portion 12. At this time, the diameter of the lower end of the filter screen 1 will gradually decrease. Since the filter cloth 22 abuts against the inner wall of the filter screen 1, the cross-section of the lower end of the filter cloth 22 will also gradually decrease, and the lower end of the filter cloth 22 has an inverted cone structure.

[0038] Reference Figures 2 to 4A first fixing rod 23 is provided on the first mounting ring 2, and a second fixing rod 24 is provided on the second mounting ring 21. A plurality of first fixing rods 23 and second fixing rods 24 are provided, and the plurality of first fixing rods 23 and the plurality of second fixing rods 24 are arranged at intervals along the circumference of the filter tank body 01. The first fixing rod 23 is slidably connected to the first mounting ring 2, and the second fixing rod 24 is fixed to the second mounting ring 21. A plurality of first return springs 25 are provided on the first mounting ring 2, and the plurality of first return springs 25 correspond one to one to the plurality of first fixing rods 23. One end of the first return spring 25 is fixed to the first mounting ring 2, and the other end is fixed to the first fixing rod 23.

[0039] Reference Figures 2 to 4 A driving member is provided on the filter tank body 01, and the driving member is configured as a driving cylinder. The driving cylinder is used to drive the second mounting ring 21 to move up and down. After filtering the liquid for a period of time, the impurities in the liquid will adhere to the surface of the filter cloth 22, and then the impurities on the surface of the filter cloth 22 are cleaned by a scraper. Since scraper cleaning belongs to the existing technology, in this embodiment, the specific structure of the scraper and the drive to rotate the scraper will not be described in detail.

[0040] Reference Figures 2 to 4 After the scraper scrapes off the impurities on the surface of the filter cloth 22, there will still be impurities attached to the surface of the filter cloth 22. Then, the second mounting ring 21 is driven downward by the driving member. During the downward movement of the second mounting ring 21, it and the second fixing rod 24 will move downward at the same time, and then the filter cloth 22 is pulled downward. During the pulling process, the filter cloth 22 no longer abuts against the inner wall of the filter screen 1. Since the diameter of the second mounting ring 21 is smaller than the diameter of the first mounting ring 2, while the filter cloth 22 is pulled downward, the cross-section of the filter cloth 22 from top to bottom will gradually become smaller, thereby further cleaning the impurities attached to the surface of the filter cloth 22.

[0041] During the downward movement of the second mounting ring 21, since the first fixing rod 23 is slidingly connected to the first mounting ring 2, multiple first fixing rods 23 will simultaneously move close to the axial direction of the filter tank body 01. At this time, multiple first fixing rods 23 will approach each other, and the first return spring 25 will be compressed. By allowing the first fixing rods 23 to approach each other, the filter cloth 22 can be reduced from being excessively stretched and deformed. After the impurities on the filter cloth 22 are cleaned, the driving cylinder drives the second mounting ring 21 to move upward. At this time, the first return spring 25 drives the first fixing rod 23 to reset. After the first fixing rod 23 is reset, the surface of the filter cloth 22 all abuts against the surface of the filter screen 1.

[0042] Because the diameter of the first mounting ring 2 is larger than that of the second mounting ring 21, the diameter of the upper end of the filter cloth 22 changes little during the downward movement of the second mounting ring 21, resulting in poor cleaning of impurities on the upper end of the filter cloth 22. A pushing assembly 3 is provided between the filter cloth 22 and the filter screen 1. The pushing assembly 3 is used to push the filter screen 1, and its cross-section is polygonal. Multiple pushing assemblies 3 are provided, and the multiple pushing assemblies 3 are spaced apart along the circumference of the filter screen 1. In this embodiment, five pushing assemblies 3 are provided. Under the action of the five pushing assemblies 3, when cleaning impurities on the surface of the filter cloth 22, the cross-section of the filter cloth 22 can be made pentagonal, thereby facilitating the cleaning of impurities on the surface of the filter cloth 22.

[0043] Reference Figures 2 to 4 , multiple limit rods 4 are provided on the first mounting ring 2, and the multiple limit rods 4 correspond one to one with the multiple pushing components 3. Since five pushing components 3 are provided, five limit rods 4 are also provided. The pushing component 3 includes a first pushing rod 31 rotatably connected to the limit rod 4 and a second pushing rod 32 hinged on the second mounting ring 21. The second pushing rod 32 is hinged to a rotating ring 10 at one end away from the second fixed rod 24. The rotating ring 10 is rotatably connected to the first pushing rod 31, and the first pushing rod 31 is vertically arranged, and the second pushing rod 32 is inclined. The first pushing rod 31 and the second pushing rod 32 simultaneously abut against the surface of the filter screen 1 and the filter cloth 22.

[0044] Reference Figures 2 to 5 A plurality of second return springs 41 are provided on the first mounting ring 2, and the plurality of second return springs 41 correspond one to one to the plurality of limit rods 4. One end of the second return spring 41 is fixed on the first mounting ring 2, and the other end is fixed on the limit rod 4. The second return spring 41 is used to move the limit rod 4 in the axial direction away from the filter tank body 01. In the initial state, the second return spring 41 is at a natural length, and the filter cloth 22 abuts against the inner wall of the filter screen 1.

[0045] In the process of driving the second mounting ring 21 to move downward, the second push rod 32 will be pulled downward. Since the first push rod 31 and the limit rod 4 are slidingly connected to the first mounting ring 2, the angle between the second push rod 32 and the first push rod 31 will gradually increase, and finally the axis of the first push rod 31 and the axis of the second push rod 32 coincide with each other. The angle between the first push rod 31 and the second push rod 32 is 180 degrees. The distance between the first push rod 31 and the axis of the filter tank body 01 is less than the distance between the end face of the second fixing rod 24 and the axis of the filter tank body 01, and then the upper end face of the stretched filter cloth 22 is a pentagonal structure; compared with the case where the pushing component 3 is not set, the filter cloth 22 with a circular arc cross-section can be changed to a filter cloth with a pentagonal cross-section, which makes it easier to clean impurities attached to the surface of the filter cloth 22.

[0046] Reference Figures 3 to 6 In this embodiment, the cross-section of the first push rod 31 is set to be an ellipse. In order to facilitate the distinction of the surface of the ellipse, the ellipse is defined as having two large curvature side surfaces 91 and two small curvature side surfaces 92, and the two large curvature side surfaces 91 are arranged on opposite sides, and the two small curvature side surfaces 92 are also arranged on opposite sides. In the initial state, the large curvature side surface 91 on the first push rod 31 abuts against the filter cloth 22 and the surface of the filter mesh 1, and then a control component 5 is provided on the first mounting ring 2. The control component 5 is used to drive the first push rod 31 to rotate. During the rotation process, the small curvature side surface 92 on the first push rod 31 will abut against the filter cloth 22, which will further tighten the stretched filter cloth 22, thereby making it more convenient to clean impurities attached to the surface of the filter cloth 22.

[0047] Reference Figures 3 to 7 The control assembly 5 includes a control block 51 mounted on the first mounting ring 2 and a control shaft 52 fixed to the control block 51. A positioning rod is fixedly mounted on the first mounting ring 2. The control block 51 is inserted through the positioning rod. The positioning rod is vertically arranged, and the control block 51 slides along the length of the positioning rod. A clearance groove is formed on the limit rod 4, and the control block 51 is disposed in the clearance groove.

[0048] Reference Figures 3 to 7 , a control groove 6 is opened on the inner wall of the give way groove, and the control shaft 52 is arranged in the control groove 6. The control groove 6 includes a first inclined portion 61 and a second inclined portion 62. The first inclined portion 61 and the second inclined portion 62 are connected. The first inclined portion 61 gradually tilts downward in the direction close to the second inclined portion 62, and the second inclined portion 62 gradually tilts downward in the direction away from the first inclined portion 61. The connection point of the first inclined portion 61 and the second inclined portion 62 forms the highest point, the end of the first inclined portion 61 away from the second inclined portion 62 forms the lowest point, and the end of the second inclined portion 62 away from the first inclined portion 61 also forms the lowest point. At the same time, a connecting component 7 is provided on the control block 51. The connecting component 7 is used to connect the control block 51 and the first push rod 31. When the first push rod 31 drives the limit rod 4 to the close position When moving in the direction close to the filter tank body 01, the control shaft 52 will move from the lowest point of the first inclined portion 61 to the highest point. At this time, under the action of the connecting component 7, the first push rod 31 will be driven to rotate, and the large curvature side 91 on the first push rod 31 will gradually separate from the filter cloth 22, and the small curvature side 92 will abut on the filter cloth 22. At this time, the filter cloth 22 will be further tensioned. When the control shaft 52 moves from the highest point to the lowest point of the second inclined portion 62, the connecting component 7 continues to drive the first push rod 31 to rotate. At this time, the small curvature side 92 on the first push rod 31 will gradually separate from the side of the filter cloth 22, and the large curvature side 91 will abut on the side of the filter cloth 22. During the whole process, a shaking of the filter cloth 22 will be achieved, which will make it more convenient to clean impurities on the surface of the filter cloth 22.

[0049] Reference Figures 3 to 7 A mounting rod 8 is provided at the end of the first push rod 31 away from the rotating ring 10. The cross-section of the mounting rod 8 is set to be circular. The mounting rod 8 is at the end of the give way groove, and the mounting rod 8 rotates on the limit rod 4. During the downward movement of the second mounting ring 21, the second push rod 32 will be driven to rotate. At the same time, the first push rod 31 will move toward the axial direction close to the filter tank body 01. During the movement, the limit rod 4 will be driven to move, and the second return spring 41 will be compressed.

[0050] Reference Figures 3 to 7 The connecting assembly 7 includes a connecting rod 71 slidably connected to the control block 51 and a connecting spring 72 fixed to the connecting rod 71. The end of the connecting spring 72 away from the connecting rod 71 is fixed to the control block 51. A connecting groove 73 is formed on the surface of the mounting rod 8. The connecting spring 72 is used to push the end of the connecting rod 71 into contact with the connecting groove 73. In this embodiment, the connecting groove 73 is configured as a spiral structure, forming a highest point and a lowest point on the surface of the mounting rod 8. In this embodiment, the length of the line connecting the highest point and the lowest point is equal to the diameter of the mounting rod 8. In order to reduce the friction of the connecting rod 71 when sliding, a rotating ball is rotatably connected to the end of the connecting rod 71 away from the connecting spring 72, and the rotating ball abuts the inner wall of the connecting groove 73.

[0051] Reference Figures 3 to 7 When the control shaft 52 is at its lowest point within the first inclined portion 61, the connecting rod 71 is at its lowest point within the connecting groove 73. When the control shaft 52 is at its highest point, the connecting rod 71 is in the middle of the connecting groove 73. At this time, the slightly curved side surface 92 on the first push rod 31 abuts the surface of the filter cloth 22. The first push rod 31 rotates 90 degrees. When the control shaft 52 is at its lowest point within the second inclined portion 62, the connecting rod 71 is at its highest point within the connecting groove 73. The significantly curved side surface 91 on the first push rod 31 abuts the surface of the filter cloth 22. In other embodiments, the number of control grooves 6 and connecting grooves 73 may be increased to increase the number of times the filter cloth 22 is shaken.

[0052] The implementation principle of a filtering device for producing pharmaceutical intermediates in an embodiment of the present application is as follows: in the initial state, the first return spring 25 and the second return spring 41 are both at their natural lengths, the filter cloth 22 abuts against the inner wall of the filter screen 1, and at the same time the first push rod 31 and the second push rod 32 are between the filter cloth 22 and the filter screen 1. After a period of use, when it is necessary to clean the impurities attached to the filter cloth 22, the scraper is brought into contact with the surface of the filter cloth 22, and the impurities on the surface of the filter cloth 22 are cleaned by rotating the scraper, and the scraped impurities can be discharged through the discharge pipe.

[0053] After the scraper scrapes off the impurities, some impurities will remain on the filter cloth 22. At this time, the second mounting ring 21 is driven downward by the driving cylinder. During the downward movement of the second mounting ring 21, the second fixing rod 24 is driven downward. At this time, the conical portion below the filter cloth 22 will be straightened, and then the cross-section of the upper end of the straightened filter cloth 22 will be larger than the cross-section of the lower end. At the same time, the filter cloth 22 no longer abuts against the surface of the filter screen 1. The impurities on the surface of the filter cloth 22 can be cleaned through the deformation of the cross-section of the filter cloth 22.

[0054] During the downward movement of the second mounting ring 21, the second mounting ring 21 drives the second push rod 32 to move downward. At this time, the angle between the second push rod 32 and the first push rod 31 will gradually increase, and finally the angle between the first push rod 31 and the second push rod 32 will be 180 degrees. During the downward movement of the second push rod 32, the first push rod 31, the limit rod 4 and the first fixing rod 23 will be driven to move in the direction close to the axis of the filter tank body 01. The first return spring 25 and the second return spring 41 are compressed. During the movement of the first push rod 31, the filter cloth 22 will be further pushed to move, so that the cross-section of the filter cloth 22 is pentagonal, thereby realizing the adjustment of the cross-sectional shape of the filter cloth 22, which can facilitate the separation of impurities from the surface of the filter cloth 22.

[0055] When the cam 72 is in the closed position, the first lever 31 is in the closed position, and the first lever 31 is in the open position, so that the cam 72 is in the open position, and the first lever 31 is in the open position, so that the cam 72 is in the open position, and the first lever 31 is in the open position, so that the cam 72 is in the open position, and the first lever 31 is in the open position, so that the cam 72 is in the open position, and the

[0056] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A filtering device for producing pharmaceutical intermediates, comprising a filter tank body (01) and a filter screen (1) disposed within the filter tank body (01), characterized in that: A first mounting ring (2) and a second mounting ring (21) are provided in the filter tank body (01), the diameter of the first mounting ring (2) being larger than the diameter of the second mounting ring (21), a filter cloth (22) is provided inside the filter screen (1), the filter cloth (22) being attached to the inner wall of the filter screen (1), a plurality of first fixing rods (23) for fixing the upper end of the filter cloth (22) are provided on the first mounting ring (2), a second fixing rod (24) for fixing the lower end of the filter cloth (22) is provided on the second mounting ring (21), and a driving member for driving the second mounting ring (21) to move up and down along the axis of the filter tank body (01) is provided on the filter tank body (01), and in the process of the driving member driving the second mounting ring (21) to move downward, the cross-section of the filter cloth (22) gradually becomes smaller from top to bottom.

2. The filtering device for producing pharmaceutical intermediates according to claim 1, characterized in that: A pushing assembly (3) is provided between the filter cloth (22) and the filter screen (1), and the pushing assembly (3) is used to push the filter cloth (22) toward the axial direction of the filter tank body (01); the pushing assembly (3) comprises a first pushing rod (31) sliding on the first mounting ring (2) and a second pushing rod (32) hinged on the second mounting ring (21), and one end of the second pushing rod (32) away from the second mounting ring (21) is hinged on the first pushing rod (31). When the filter cloth (22) abuts against the inner wall of the filter screen (1), the second pushing rod (32) is tilted, and the tilted second pushing rod (32) abuts against the inner wall of the filter screen (1). A plurality of the first pushing rods (31) and the second pushing rods (32) are provided, and the plurality of first pushing rods (31) and the plurality of second pushing rods (32) are arranged at intervals along the circumference of the filter tank body (01).

3. The filtering device for producing pharmaceutical intermediates according to claim 1, characterized in that: The first fixing rod (23) is slidably connected to the first mounting ring (2) along the diameter of the first mounting ring (2), and a first return spring (25) is fixedly mounted on the first fixing rod (23), and one end of the first return spring (25) away from the first fixing rod (23) is fixed to the first mounting ring (2).

4. The filtering device for producing pharmaceutical intermediates according to claim 2, characterized in that: The first mounting ring (2) is slidably connected to a limit rod (4), the first push rod (31) is arranged on the limit rod (4), and a second return spring (41) for driving the first push rod (31) to return is fixedly installed on the limit rod (4), and one end of the second return spring (41) is fixed to the first mounting ring (2).

5. The filtering device for producing pharmaceutical intermediates according to claim 4, characterized in that: The cross-section of the first push rod (31) in the horizontal direction is set to be an ellipse. The first push rod (31) is provided with a side surface with a large curvature (91) and a side surface with a small curvature (92). The first mounting ring (2) is provided with a control component (5) for driving the first push rod (31) to rotate. During the rotation of the first push rod (31), the side surface with a small curvature (92) on the first push rod (31) gradually abuts against the surface of the filter cloth (22).

6. The filtering device for producing pharmaceutical intermediates according to claim 5, characterized in that: The control assembly (5) comprises a control block (51) arranged on a first mounting ring (2) and a control shaft (52) fixed on the control block (51); the control block (51) slides on the first mounting ring (2) along the axial direction of the filter tank body (01); a connecting assembly (7) is provided on the control block (51); the connecting assembly (7) is used to connect the control block (51) and the first push rod (31); and a control groove (6) is provided on the limit rod (4) for driving the control block (51) to move up and down.

7. The filtering device for producing pharmaceutical intermediates according to claim 6, characterized in that: The control shaft (52) is slidably connected in the control groove (6), and the control groove (6) includes a first inclined portion (61) and a second inclined portion (62), wherein the first inclined portion (61) gradually tilts upward in a direction approaching the second inclined portion (62), and the second inclined portion (62) gradually tilts downward in a direction away from the first inclined portion (61).

8. The filtering device for producing pharmaceutical intermediates according to claim 6, characterized in that: The connecting assembly (7) comprises a connecting rod (71) slidably connected to the control block (51) and a connecting spring (72) fixed to the control block (51), one end of the connecting spring (72) is fixed to the connecting rod (71), a connecting groove (73) is provided on the first push rod (31), and the connecting groove (73) is configured as a spiral structure. The connecting spring (72) pushes the connecting rod (71) to abut against the inner wall of the connecting groove (73).

9. The filtering device for producing pharmaceutical intermediates according to claim 8, characterized in that: A positioning rod is fixedly mounted on the first mounting ring (2), and the control block (51) is slidably connected to the positioning rod.

10. The filtering device for producing pharmaceutical intermediates according to claim 2, characterized in that: Five of the first push rods (31) and the second push rods (32) are provided.

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