Medical intermediate filtering device

Abstract

The invention provides a medical intermediate filtering device, and belongs to the technical field of pharmaceutical chemicals, the medical intermediate filtering device comprises a working box, a filtering net cylinder and a driving device, the working box is provided with a working cavity, a feeding port, a first discharging port and a second discharging port, the feeding port, the first discharging port and the second discharging port are communicated with the working cavity, and the feeding port is higher than the first discharging port; the filter screen cylinder is rotationally arranged in the working cavity, the two ends of the filter screen cylinder are rotationally connected with the feeding port and the first discharging port respectively, the filter screen cylinder is used for dynamic solid-liquid separation, the second discharging port is formed below the filter screen cylinder so as to form gravity diversion, and the driving device is arranged on the working box and used for driving the working box to rotate. And the filter screen is in transmission connection with the filter screen cylinder. In the process of realizing continuous production, the filtering efficiency and the equipment stability are improved, and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of pharmaceutical chemical industry, in particular to a pharmaceutical intermediate filtering device. Background Art

[0002] Solid-liquid separation is a critical process in the production of pharmaceutical intermediates. Because pharmaceutical intermediates often have complex chemical compositions, high viscosity, or uneven particle distribution, stringent requirements are placed on filtration efficiency, separation accuracy, and equipment corrosion resistance.

[0003] Filter presses are widely used in traditional filtration processes. They apply pressure to force liquids through filter cloths or plates, achieving solid-liquid separation. However, existing filter presses have significant drawbacks in practical applications: First, filter residues tend to accumulate rapidly on the filter cloth surface, causing filtration efficiency to drop sharply over time. Second, after each batch of filtration, the machine must be shut down to disassemble the filter plates or cloth for manual cleaning. This is not only cumbersome and labor-intensive, but also severely restricts continuous production. Furthermore, repeated disassembly and assembly can easily cause wear on the filter media, increasing maintenance costs. Summary of the Invention

[0004] Based on this, the purpose of the present invention is to provide a pharmaceutical intermediate filtering device, which aims to improve the filtering efficiency and equipment stability and reduce the production cost during the continuous production process.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: a pharmaceutical intermediate filtering device, comprising a working box, a filter screen cartridge, and a driving device, wherein the working box is provided with a working chamber and a feed port, a first discharge port, and a second discharge port connected to the working chamber, wherein the height of the feed port is higher than the height of the first discharge port; the filter screen cartridge is rotatably arranged in the working chamber, and the two ends of the filter screen cartridge are respectively rotatably connected to the feed port and the first discharge port for dynamic solid-liquid separation, wherein the second discharge port is arranged below the filter screen cartridge to form gravity diversion; the driving device is arranged on the working box and is transmission-connected to the filter screen cartridge.

[0006] In addition, the pharmaceutical intermediate filtering device according to the present invention may also have the following additional technical features: Furthermore, the pharmaceutical intermediate filtering device also includes an extrusion assembly for radially and reciprocatingly extruding the filter residue on the inner wall of the filter screen cylinder. The extrusion assembly includes a rotating drum, a pressure plate, a rotating shaft, and a first transmission assembly. The rotating drum is coaxially fixed in the filter screen cylinder. The pressure plate has a sliding portion and an extrusion portion that matches the shape of the inner wall of the rotating drum. The sliding portion is horizontally slidably arranged on the rotating drum and slides radially along the rotating drum. The rotating shaft is rotatably arranged on the rotating drum and is transmission-connected to the driving device. The first transmission assembly transmission-connects the sliding portion and the rotating shaft to drive the sliding portion to slide horizontally and reciprocatingly along the radial direction of the rotating drum when the rotating shaft rotates; wherein, when the sliding portion slides horizontally and reciprocatingly along the radial direction of the rotating drum, the extrusion portion approaches and moves away from the inner wall of the filter screen cylinder.

[0007] Furthermore, the pressure plate is arranged in a region between a middle position and a lowest position of the outer circumference of the drum.

[0008] Furthermore, the first transmission assembly includes two groups of cam blocks centrally and symmetrically arranged on the circumferential surface of the rotating shaft, and a first reset mechanism; wherein, when the cam blocks squeeze the sliding portion radially outward along the rotating cylinder, the first reset mechanism is used to provide a reverse restoring force to achieve periodic reset of the pressure plate.

[0009] Furthermore, the pharmaceutical intermediate filtration device also includes a shifting assembly for dispersing the filter residue accumulated at the lowest position of the inner wall of the rotating drum. The shifting assembly includes a slider, a second transmission assembly, two groups of lever frames, and two groups of third transmission assemblies. The slider is radially limited in the rotating drum. The second transmission assembly is connected to the slider and the rotating shaft so as to drive the slider to move back and forth horizontally along the axial direction of the rotating drum when the rotating shaft rotates. The two groups of lever frames are rotatably arranged on the rotating drum, and the two groups of lever frames are respectively connected to the slider through the two groups of third transmission assemblies; wherein, when the slider moves back and forth horizontally, the two groups of lever frames swing back and forth along the radial contour of the inner wall of the rotating drum with the lowest position of the inner wall of the rotating drum as the starting point, and the swinging directions of the two groups of lever frames are opposite.

[0010] Furthermore, the second transmission assembly includes a bidirectional screw, a first driving gear, and a first driven gear. The bidirectional screw is rotatably set on the rotating drum, the slider is threadedly connected to the bidirectional screw, the first driving gear is sleeved on the rotating shaft, and the first driven gear is sleeved on the bidirectional screw and meshed with the first driving gear.

[0011] Furthermore, the third transmission assembly includes a rack block, a second driven gear, and a second reset mechanism. One end of the rack block is vertically slidably arranged on the rotating cylinder, and the other end of the rack block forms a wedge-shaped fit with the slider. The second driven gear is sleeved on the shift rod frame and meshes with the rack block. The second reset mechanism is arranged between the rack block and the rotating cylinder. When the rack block slides vertically downward, the second reset mechanism is used to provide a reverse restoring force.

[0012] Furthermore, the two groups of the shifting rod frames are coaxially rotatably sleeved together, and the shifting rods on the two groups of the shifting rod frames are staggered along the axial direction.

[0013] Furthermore, the driving device includes a third driven gear, a motor, an intermediate shaft, and a gear transmission mechanism. The third driven gear is sleeved on the outer circumferential surface of the filter cylinder. The motor is meshed with the third driven gear through a reduction gear set. The intermediate shaft is rotatably set on the working box. The intermediate shaft is provided with a fourth driven gear meshed with the third driven gear. The gear transmission mechanism transmits the connection between the intermediate shaft and the rotating shaft.

[0014] Furthermore, the pharmaceutical intermediate filtration device also includes a cleaning assembly for cleaning filter residue from the mesh of the filter cylinder. The cleaning assembly includes an air box and a nozzle. The air box is mounted on the working box and has an air cavity connected to the air supply device via an air pipe. Multiple nozzles are provided, each mounted on the air box and connected to the air cavity. All nozzles face upward from the filter cylinder.

[0015] The beneficial effects of the present invention include at least: achieving continuous dynamic filtration through the rotating filter screen, combining the periodic radial extrusion of the filter residue by the extrusion component and the axial dispersion effect of the shifting component, thereby improving the solid-liquid separation efficiency of multi-component pharmaceutical intermediates. At the same time, for some stubborn filter residues, clean water with a certain flow rate and pressure can be directly introduced into the rotating filter screen. Under the flushing effect of the clean water, the clean water can carry the filter residue along the wall of the filter screen and be discharged from the first discharge port. A mixture of some water and fine residue can pass through the filter screen and finally be discharged from the second discharge port. The entire process does not require stopping the machine for manual residue cleaning, nor does it require stopping the machine to disassemble the filter screen for manual residue cleaning, thereby improving filtration efficiency, being suitable for continuous production, and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the structure of a pharmaceutical intermediate filtering device in one embodiment of the present invention; Figure 2 This is a schematic diagram of the structure inside the working box in one embodiment of the present invention; Figure 3Schematic diagram of the structure of a driving device in one embodiment of the present invention; Figure 4 Schematic diagram of the structure inside the filter screen cartridge in one embodiment of the present invention; Figure 5 Schematic diagram of the structure of an extrusion assembly in one embodiment of the present invention; Figure 6 is an exploded view of an extrusion assembly in one embodiment of the present invention; Figure 7 Schematic diagram of the structure of the transfer component in one embodiment of the present invention; Figure 8 An exploded view of an allocation assembly in one embodiment of the present invention; Figure 9 This is a schematic structural diagram of a second transmission assembly in one embodiment of the present invention; Description of main component symbols: Working box 100, working chamber 110, feed port 120, sealing end cover 121, first discharge port 130, second discharge port 140, first bracket 150, second bracket 160, filter screen cartridge 200; Driving device 300, third driven gear 310, motor 320, reduction gear set 321, intermediate shaft 330, fourth driven gear 331, gear train transmission mechanism 340, lower hopper 400, rotary joint 500; Rotating drum 610, limiting groove 611, pressing plate 620, plate body 621, rod body 622, rotating shaft 630, first transmission assembly 640, cam block 641, first reset mechanism 642; Slider 710, second transmission assembly 720, bidirectional screw 721, first driving gear 722, first driven gear 723, lever frame 730, third transmission assembly 740, rack block 741, hemispherical groove 7411, second driven gear 742, second reset mechanism 743; Protective shell 800, cleaning assembly 900, air box 910, nozzle 920; The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0017] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The drawings illustrate several embodiments of the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention.

[0018] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0020] Please refer to Figures 1 to 9 The present invention provides a pharmaceutical intermediate filtering device, comprising a working box 100, a filter screen cartridge 200, and a driving device 300. Specifically, a working chamber 110 is provided inside the working box 100. A feed port 120, a first discharge port 130, and a second discharge port 140 communicating with the working chamber 110 are further provided on the wall of the working box 100. The filter screen cartridge 200 is rotatably disposed within the working chamber 110, and the left and right ends of the filter screen cartridge 200 are rotatably connected to the feed port 120 and the first discharge port 130, respectively. The driving device 300 is disposed on the working box 100 and is in transmission connection with the filter screen cartridge 200. When the driving device 300 is in operation, the driving device 300 drives the filter screen cartridge 200 to rotate within the working chamber 110.

[0021] During specific assembly, the height of the feed port 120 is higher than the height of the first discharge port 130, so that the filter screen cylinder 200 is tilted, so that the residue can move along the cylinder wall of the filter screen cylinder 200 toward the side of the first discharge port 130, and in order to facilitate the formation of gravity drainage, the second discharge port 140 is arranged below the filter screen cylinder 200, so that the pharmaceutical intermediate slurry passing through the filter screen cylinder 200 can be smoothly discharged from the second discharge port 140 under the action of gravity.

[0022] In actual use, the pharmaceutical intermediate slurry carrying the residue is poured into the filter screen cylinder 200 from the feed port 120, and the residue filtered out by the filter screen cylinder 200 is discharged from the first discharge port 130. Under the action of gravity and centrifugal force, the relatively pure pharmaceutical intermediate slurry obtained by filtering through the filter screen cylinder 200 is discharged from the second discharge port 140.

[0023] In this embodiment, the filter residue is not easy to accumulate quickly on the surface of the rotating filter screen drum 200, and the filtration efficiency will not drop sharply with the running time. At the same time, since the filter residue that cannot pass through the filter screen drum 200 can move along the cylinder wall of the filter screen drum 200 to the side of the first discharge port 130, the filter residue can be discharged in sequence from the second discharge port 140 of the inclined and rotating filter screen drum 200. Moreover, for some stubborn filter residue, clean water with a certain flow rate and pressure can be directly introduced into the rotating filter screen drum 200. Under the flushing action of the clean water, the clean water can carry the filter residue along the cylinder wall of the filter screen drum 200 and be discharged from the first discharge port 130. A mixture of some water and fine residue can pass through the filter screen drum 200 and finally be discharged from the second discharge port 140. The entire process does not require shutdown for manual slag cleaning, nor does it require shutdown to disassemble the filter screen drum 200 for manual slag cleaning. It is suitable for continuous production and reduces production costs.

[0024] In some optional embodiments, in order to facilitate feeding, such as Figure 1 As shown, a lower hopper 400 with an inverted conical cavity is provided at the feed port 120 . The lower hopper 400 can ensure that the pharmaceutical intermediate slurry slides freely, so that it can smoothly enter the filter screen cylinder 200 from the feed port 120 .

[0025] In some optional embodiments, such as Figure 1 As shown, a sealing end cover 121 is fixedly provided at the feed port 120 to prevent the slurry entering the filter screen cylinder 200 from splashing out. At the same time, the lower hopper 400 is rotatably connected to the sealing end cover 121 through a rotary joint 500.

[0026] In some optional embodiments, the pharmaceutical intermediate filtering device further comprises an extrusion assembly for reciprocatingly extruding the filter residue on the inner wall of the filter screen cartridge 200 along the radial direction of the filter screen cartridge 200. Specifically, as Figure 1As shown, the extrusion assembly includes a drum 610, a pressure plate 620, a rotating shaft 630, and a first transmission assembly 640. The drum 610 is fixed in the filter screen cartridge 200 and is also arranged coaxially with the filter screen cartridge 200. The pressure plate 620 has a sliding portion and an extrusion portion that matches the shape of the inner wall of the drum 610. The sliding portion is horizontally slidably arranged on the drum 610 and slides radially along the drum 610 when sliding. The rotating shaft 630 is rotatably arranged on the drum 610 and is transmission-connected to the driving device 300. The first transmission assembly 640 transmission-connects the sliding portion and the rotating shaft 630. When the driving device 300 is in operation, the driving device 300 drives the rotating shaft 630 to rotate. The rotating shaft 630 drives the sliding portion to slide horizontally back and forth along the radial direction of the drum 610 through the first transmission assembly 640. When the rotating shaft 630 drives the sliding part to slide horizontally outward along the radial direction of the rotating drum 610 through the first transmission assembly 640, the extrusion part gradually approaches the inner wall of the filter mesh cylinder 200 until the extrusion part squeezes the filter residue on the inner wall of the filter mesh cylinder 200; similarly, when the rotating shaft 630 drives the sliding part to slide horizontally inward along the radial direction of the rotating drum 610 through the first transmission assembly 640, the extrusion part gradually moves away from the inner wall of the filter mesh cylinder 200. At this time, the extrusion part no longer squeezes the filter residue on the inner wall of the filter mesh cylinder 200, so that the filter residue gradually moves toward the side of the first discharge port 130 as the filter mesh cylinder 200 moves.

[0027] In this embodiment, the filter residue containing the slurry can be further processed by the extrusion component, that is, the slurry in the filter residue can be squeezed out by extrusion, thereby avoiding the waste of the active ingredients of the pharmaceutical intermediate in the slurry.

[0028] In some optional embodiments, such as Figure 1 As shown, the pressure plate 620 includes an arcuate plate body 621 and a rod body 622 connected to the concave surface of the plate body 621. The plate body 621 forms the pressing portion of the pressure plate 620, and the rod body 622 forms the sliding portion of the pressure plate 620. Specifically, a sliding hole 611 is provided on the peripheral wall of the rotating drum 610. The rod body 622 is limitedly disposed within the sliding hole 611 and extends into the interior of the rotating drum 610. The convex surface of the plate body 621 matches the shape of the inner wall of the filter drum 200. When the driving device 300 is in operation, the driving device 300 drives the rotating shaft 630 to rotate. At this time, the rotating shaft 630 drives the rod body 622 to slide horizontally inward in the sliding hole 611 along the radial direction of the rotating drum 610 via the first transmission assembly 640.

[0029] When the rotation speed of the filter screen cartridge 200 is low, the centrifugal force generated is insufficient to rotate the filter residue to a higher position. At this time, if the contact position between the pressure plate 620 and the inner wall of the filter screen cartridge 200 is high, the pressure plate 620 will not be able to squeeze the filter residue below the inner wall of the filter screen cartridge 200. Therefore, in some optional embodiments, such as Figure 1As shown, the pressing plate 620 is disposed in an area between the middle position and the lowest position of the outer circumference of the rotating drum 610 .

[0030] In some optional embodiments, such as Figure 1 As shown, the first transmission assembly 640 includes two sets of cam blocks 641 centrally and symmetrically arranged on the circumference of the rotating shaft 630, and a first reset mechanism 642. Optionally, the two sets of cam blocks 641 are integrally manufactured parts.

[0031] In this embodiment, as the cam block 641 rotates, the convex portion of the cam block 641 periodically squeezes the rod 622 radially outward from the drum 610. At this time, the first reset mechanism 642 provides a reverse restoring force. When the convex portion of the cam block 641 moves away from the rod 622, the pressure plate 620 is reset by the restoring force provided by the first reset mechanism 642. Furthermore, because the two sets of cam blocks 641 are centrally symmetrical, when the convex portion of one cam block 641 squeezes the rod 622 radially outward from the drum 610, the convex portion of the other cam block 641 is away from the rod 622. This allows the filter residue, which rotates once with the filter drum 200, to be squeezed twice when the filter drum 200 rotates at a high speed, further preventing waste of the active ingredients of the pharmaceutical intermediate in the slurry.

[0032] In some optional embodiments, such as Figure 1 As shown, the first reset mechanism 642 includes a spring, one end of the spring is fixed to the rod body 622 , and the other end of the spring is fixed to the rotating drum 610 .

[0033] During the rotation of the filter screen drum 200, since most of the filter residue gathers at the bottom of the filter screen drum 200, if the accumulation is large, the filter residue in the middle and lower parts that is not in direct contact with the pressure plate 620 will not be easily completely squeezed when the extrusion assembly is extruded, thereby reducing the extrusion efficiency of the extrusion assembly. In addition, an excessively thick filter residue layer can easily cause the extrusion assembly to be unable to move radially outward along the rotating drum 610, which is very likely to destroy the mesh structure of the filter screen drum 200 and may also cause damage to the extrusion assembly.

[0034] To this end, in some optional embodiments, the pharmaceutical intermediate filtering device further includes a shifting assembly for dispersing the filter residue accumulated at the lowest position of the inner wall of the drum 610. Specifically, Figure 1As shown, the transfer assembly includes a slider 710, a second transmission assembly 720, two sets of shifting rod frames 730, and two sets of third transmission assemblies 740. The slider 710 is radially limited within the rotating drum 610. Optionally, a limiting groove 611 is provided at the top of the inner portion of the rotating drum 610, and the top of the slider 710 is slidably embedded in the limiting groove 611. The second transmission assembly 720 is transmission-connected between the slider 710 and the rotating shaft 630. When the driving device 300 is in operation, the driving device 300 drives the rotating shaft 630 to rotate. The rotating rotating shaft 630 drives the slider 710 to reciprocate horizontally along the axial direction of the rotating drum 610 through the second transmission assembly 720. The two sets of shifting rod frames 730 are both rotatably mounted on the rotating drum 610, and the two sets of shifting rod frames 730 are transmission-connected to the slider 710 through two sets of third transmission assemblies 740. When the slider 710 moves back and forth horizontally along the axial direction of the rotating drum 610, the two sets of lever frames 730 swing back and forth along the radial contour of the inner wall of the rotating drum 610 with the lowest position of the inner wall of the rotating drum 610 as the starting point, and the swing directions of the two sets of lever frames 730 are opposite. In this way, by shifting the filter residue in opposite directions by the two sets of lever frames 730, most of the filter residue gathered at the bottom of the filter screen drum 200 can be spread out along the radial direction of the inner wall of the rotating drum 610, thereby avoiding the adverse effects of the accumulation of filter residue on the extrusion operation.

[0035] In some optional embodiments, the second transmission assembly 720 includes a bidirectional screw rod 721, a first driving gear 722, and a first driven gear 723. Specifically, Figure 1 As shown, the bidirectional screw rod 721 is rotatably mounted on the rotating drum 610, the slider 710 is threadedly connected to the bidirectional screw rod 721, the first driving gear 722 is sleeved on the rotating shaft 630, and the first driven gear 723 is sleeved on the bidirectional screw rod 721 and meshed with the first driving gear 722. When the driving device 300 is in operation, the driving device 300 drives the rotating shaft 630 to rotate. The rotating rotating shaft 630 transmits the driving force to the bidirectional screw rod 721 through the meshing first driving gear 722 and the first driven gear 723, causing the bidirectional screw rod 721 to rotate in a certain direction. Since the top of the slider 710 is slidably embedded in the limiting groove 611, the slider 710 cannot rotate and can only move along the axial direction of the bidirectional screw rod 721. When the slider 710 moves to one end of the bidirectional thread groove on the bidirectional screw rod 721, it will move in the opposite direction along the axial direction of the bidirectional screw rod 721.

[0036] In some optional embodiments, the third transmission assembly 740 includes a rack block 741, a second driven gear 742, and a second reset mechanism 743. Specifically, Figure 1As shown, the lower end of the rack block 741 is vertically slidably mounted on the rotating cylinder 610, the upper end of the rack block 741 forms a wedge-shaped fit with the slider 710, the second driven gear 742 is sleeved on the shifting rod frame 730 and meshes with the rack block 741, and the second reset mechanism 743 is disposed between the rack block 741 and the rotating cylinder 610. When the slider 710 moves axially along the bidirectional screw rod 721 and pushes the rack block 741 to slide vertically downward, the second reset mechanism 743 provides a restoring force in the opposite direction. When the slider 710 gradually moves in the opposite direction along the axial direction of the bidirectional screw rod 721, the rack block 741 slides vertically upward under the action of the restoring force provided by the second reset mechanism 743 until the position of the rack block 741 is restored.

[0037] In some optional embodiments, such as Figures 1 to 4 As shown, the second reset mechanism 743 includes a spring, one end of the spring is fixed to the rotating drum 610 , and the other end of the spring is fixed to the rack block 741 .

[0038] In some optional embodiments, in order to reduce the risk of jamming between the upper end of the rack block 741 and the slider 710, as shown in FIG. Figure 9 As shown, a hemispherical groove 7411 is provided on the top of the rack block 741, and a ball body 800, such as a steel ball, is rotatably embedded in the hemispherical groove 7411. In this embodiment, the ball body 800 can convert sliding friction into pure rolling friction, and the reduction of the friction coefficient can reduce the risk of sticking.

[0039] In some optional embodiments, such as Figure 5 、 Figure 7 、 Figure 8 As shown, the two groups of shifting rod frames 730 are coaxially rotatably sleeved together, and the shifting rods on the two groups of shifting rod frames 730 are staggered along the axial direction.

[0040] In this embodiment, the two sets of lever frames 730 utilize a coaxial sleeve structure. The inner lever frame 730 is rotatably mounted on the rotating drum 610, while the outer lever frame 730 is coaxially sleeved and rotatably mounted on the outer portion of the inner lever frame 730. In this case, the outer lever frame 730 is effectively indirectly rotatably mounted on the rotating drum 610. Because the two sets of lever frames 730 share the same axial space, space utilization is significantly improved. Furthermore, the coaxial arrangement of the two lever frames 730 eliminates the need for complex transmission structures in the two sets of third transmission assemblies 740, thereby improving structural stability. Furthermore, the levers on the two lever frames 730 are staggered along the axial direction, ensuring that the two levers do not mechanically collide during synchronous rotation.

[0041] In some optional embodiments, the driving device 300 includes a third driven gear 310, a motor 320, an intermediate shaft 330, and a gear train transmission mechanism 340. Specifically, Figure 2 、 Figure 3As shown, the third driven gear 310 is sleeved on the outer circumferential surface of the filter drum 200, the motor 320 is meshed with the third driven gear 310 via a reduction gear set 321, the intermediate shaft 330 is rotatably mounted on the working box 100, and the intermediate shaft 330 is provided with a fourth driven gear 331 meshed with the third driven gear 310. The gear train transmission mechanism 340 is transmission-connected between the intermediate shaft 330 and the rotating shaft 630. Optionally, the gear train transmission mechanism 340 may be a sprocket or pulley transmission mechanism.

[0042] In this embodiment, when the motor 320 rotates, the motor 320 drives the filter screen drum 200 to rotate on the working box 100 through the reduction gear set 321 and the third driven gear 310, and at the same time drives the intermediate shaft 330 to rotate on the working box 100 through the third driven gear 310 and the fourth driven gear, and then drives the rotating shaft 630 to rotate on the rotating drum 610 through the gear train transmission mechanism 340.

[0043] In some optional embodiments, in order to protect the driving device 300, as Figure 1 As shown, a protective shell 800 is provided on the working box 100 , and the protective shell 800 covers the third driven gear 310 , the motor 320 and the reduction gear set 321 .

[0044] In some optional embodiments, such as Figure 1 、 Figure 4 As shown, one end of the rotating drum 610 close to the first discharge port 130 is fixed to the protective shell 800 through the first bracket 150, and one end of the rotating drum 610 close to the feed port 120 is fixed to the working box 100 through the second bracket 160, so that the rotating drum 610 remains in a fixed state.

[0045] During the rotation of the filter screen cartridge 200, the filter residue may be stuck in the sieve holes of the filter screen cartridge 200, resulting in the intermediate slurry being unable to be filtered smoothly through the filter screen cartridge 200. To this end, in some optional embodiments, the pharmaceutical intermediate filtering device further includes a cleaning component 900, which is used to clean the filter residue in the sieve holes of the filter screen cartridge 200. Specifically, as Figure 2 As shown, the cleaning assembly 900 includes an air box 910 and a nozzle 920. The air box 910 is mounted on the work box 100 and defines an air cavity, which is connected to a gas delivery device via an air pipe. Multiple nozzles 920 are provided, each mounted on the air box 910 and connected to the air cavity. All nozzles 920 face upward from the filter cartridge 200. When high-speed, high-pressure gas is ejected from the nozzles 920, the filter residue in the mesh of the filter cartridge 200 is effectively removed.

[0046] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0047] The above-described embodiments merely illustrate several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, and these modifications and improvements fall within the scope of the present invention. Therefore, the scope of the present invention shall be determined by the appended claims.

Claims

1. A pharmaceutical intermediate filtering device, characterized in that: The pharmaceutical intermediate filtering device comprises: A working box is provided with a working chamber and a feed port, a first discharge port and a second discharge port connected to the working chamber; wherein the height of the feed port is higher than the height of the first discharge port; A filter screen cartridge is rotatably disposed in the working chamber, and the two ends of the filter screen cartridge are rotatably connected to the feed port and the first discharge port, respectively, for dynamic solid-liquid separation; wherein the second discharge port is disposed below the filter screen cartridge to form gravity diversion; The driving device is arranged on the working box and is drivingly connected to the filter cylinder.

2. The pharmaceutical intermediate filtering device according to claim 1, characterized in that: The pharmaceutical intermediate filtering device further includes an extrusion assembly for radially and reciprocatingly extruding the filter residue on the inner wall of the filter cylinder, the extrusion assembly comprising: a rotating drum coaxially fixed in the filter cylinder; a pressing plate having a sliding portion and a pressing portion matching the shape of the inner wall of the rotating drum, wherein the sliding portion is horizontally slidably arranged on the rotating drum and slides radially along the rotating drum; a rotating shaft, rotatably disposed on the rotating drum and transmission-connected to the driving device; a first transmission assembly, which is in transmission connection between the sliding portion and the rotating shaft, so as to drive the sliding portion to slide back and forth horizontally along the radial direction of the rotating drum when the rotating shaft rotates; Wherein, when the sliding portion slides horizontally and reciprocatingly along the radial direction of the rotating drum, the extruding portion approaches and moves away from the inner wall of the filter screen drum.

3. The pharmaceutical intermediate filtering device according to claim 2, characterized in that: The pressing plate is arranged in a region between a middle position and a lowest position of the outer circumference of the rotating drum.

4. The pharmaceutical intermediate filtering device according to claim 3, characterized in that: The first transmission assembly includes two groups of cam blocks centrally and symmetrically arranged on the circumferential surface of the rotating shaft, and a first reset mechanism; wherein, when the cam blocks squeeze the sliding portion radially outward along the rotating cylinder, the first reset mechanism is used to provide a reverse restoring force to achieve periodic reset of the pressure plate.

5. The pharmaceutical intermediate filtering device according to claim 2, characterized in that: The pharmaceutical intermediate filtering device further includes a dividing assembly for dispersing the filter residue accumulated at the lowest position of the inner wall of the drum, and the dividing assembly includes: A slider, radially limited in the rotating drum; a second transmission assembly, drivingly connecting the slider and the rotating shaft, so as to drive the slider to reciprocate horizontally along the axial direction of the rotating drum when the rotating shaft rotates; Two sets of lever frames are rotatably mounted on the rotating drum; Two sets of third transmission assemblies, wherein the two sets of shift rod frames are respectively connected to the slider through the two sets of third transmission assemblies; When the slider moves back and forth horizontally, the two groups of lever frames swing back and forth along the radial contour of the inner wall of the drum starting from the lowest position of the inner wall of the drum, and the swing directions of the two groups of lever frames are opposite.

6. The pharmaceutical intermediate filtering device according to claim 5, characterized in that: The second transmission assembly includes: A bidirectional screw rod is rotatably arranged on the rotating drum, and the slider is threadedly connected to the bidirectional screw rod; A first driving gear is sleeved on the rotating shaft; The first driven gear is sleeved on the bidirectional screw rod and meshed with the first driving gear.

7. The pharmaceutical intermediate filtering device according to claim 5, characterized in that: The third transmission assembly includes: A rack block, one end of which is vertically slidably disposed on the rotating drum, and the other end of which forms a wedge-shaped fit with the slider; a second driven gear, sleeved on the shifting rod frame and meshing with the rack block; The second reset mechanism is provided between the rack block and the rotating drum. When the rack block slides vertically downward, the second reset mechanism is used to provide a reverse restoring force.

8. The pharmaceutical intermediate filtering device according to claim 1, characterized in that: The two groups of shifting rod frames are coaxially rotatably sleeved together, and the shifting rods on the two groups of shifting rod frames are staggered along the axial direction.

9. The pharmaceutical intermediate filtering device according to claim 2, characterized in that: The driving device comprises: a third driven gear, sleeved on the outer circumferential surface of the filter cylinder; a motor, meshingly connected to the third driven gear via a reduction gear set; an intermediate shaft rotatably mounted on the working box, the intermediate shaft being provided with a fourth driven gear meshing with the third driven gear; The gear train transmission mechanism is configured to transmit and connect the intermediate shaft and the rotating shaft.

10. The pharmaceutical intermediate filtering device according to any one of claims 1 to 9, characterized in that: The pharmaceutical intermediate filtering device further includes a cleaning component for cleaning filter residues in the sieve holes of the filter cylinder. The cleaning component includes: An air box is provided on the working box, and the air box is provided with an air cavity, and the air cavity is used to connect to the air delivery device through an air pipe; There are multiple nozzles, all of which are arranged on the air box and are connected to the air cavity, and all of the nozzles are facing the upper side of the filter cylinder.

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