Collagen multi-stage filtration device

Abstract

The application discloses a collagen multistage filtering device and relates to the technical field of filtering. The collagen multistage filtering device comprises a coarse filter and a fine filter, is used for filtering once and filtering twice directly, wherein the fine filter comprises a shell and filtering bodies arranged in the shell, collagen liquid channels are formed between adjacent filtering bodies, a driving mechanism is arranged on the shell and is used for adjusting the distance between the adjacent filtering bodies, and the collagen liquid channels form reduced channels; the region opposite to the reduced channels on the shell is provided with a spray pipe, the spray pipe is communicated with the collagen liquid filtered once, the spray pipe can spray the collagen liquid to the reduced channels, the coarse filter, a heat exchanger, a buffer tank and the fine filter are sealed and connected through pipelines, online heat exchange and cooling of materials are realized in the pipeline conveying process, and the whole-process continuous and automatic production of 'filtering once and conveying, discharging and filtering twice' is realized.

Description

Technical Field

[0001] This invention relates to the field of filtration technology, specifically to a collagen multi-stage filtration device. Background Technology

[0002] Collagen specifically refers to the collagen liquid extracted from connective tissues such as animal skin and bones. This collagen slurry is a core raw material for producing artificial collagen casings or as a binder, filler, and water-retaining agent in meat products (such as ham sausages). It is usually a fluid or semi-fluid with a certain viscosity. During the production process, it needs to be finely filtered to remove impurities, incompletely dissolved particles, or large molecular clusters, ensuring that the final product has a delicate texture, uniform structure, and standard diameter.

[0003] The existing filtration process uses a two-stage filtration process, namely primary filtration and secondary filtration. The primary filtration is done in a square barrel, and the secondary filtration is done in a round barrel, which occupies a lot of containers. The mixed material is first filtered through the primary filtration and then placed in a cold storage to cool to a suitable temperature before undergoing secondary filtration (the temperature of the primary filtration is about 35℃, and the temperature of the secondary filtration is about 17℃). This process involves two rounds of material handling and storage, which consumes labor, square barrels, and occupies cold storage space. The two rounds of handling also increase the risk of contamination during material transportation. Furthermore, the above process cannot achieve continuous filtration, resulting in low daily production rate. In addition, the high frequency of filter bag backwashing during the filtration process leads to poor filtration continuity. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a multi-stage collagen filtration device, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a multi-stage collagen filtration device, comprising a coarse filter and a fine filter, for direct secondary filtration after primary filtration; wherein the fine filter comprises a shell and filter bodies arrayed within the shell, with collagen liquid channels formed between adjacent filter bodies; a driving mechanism is installed on the shell to adjust the distance between adjacent filter bodies, thereby narrowing the collagen liquid channels; nozzles are provided on the area of ​​the shell opposite to the narrowing channels, and the nozzles are connected to the primary filtered collagen liquid, enabling the nozzles to spray collagen liquid into the narrowing channels; a carrier plate is provided near the top surface of the shell, which supports the upper end of the filter bodies; and a filtered liquid drainage assembly connected to the outside is provided at the lower end of the filter bodies.

[0006] Furthermore, the filter body includes an inner cage, with a movable slip ring fitted on the upper end of the inner cage. A filter bag and an elastic sheet are fixed between the movable slip ring and the lower end of the inner cage. The elastic sheet is located in the interlayer between the inner cage and the filter bag. The driving mechanism is used to drive the movable slip ring to slide axially, so that the elastic sheet can open the movable slip ring. After opening, the narrowed channel formed between four adjacent filter bags is a conical channel. The nozzle is located on the upper and lower sides of the outer shell and is used to spray collagen liquid into the conical channels on the upper and lower sides.

[0007] Furthermore, a through hole is provided in the area of ​​the carrier plate opposite to the filter body. The inner cage includes an upper fixed seat, a lower fixed seat located below the upper fixed seat, and a cage body installed between the upper fixed seat and the lower fixed seat. The upper fixed seat and the sliding ring are both located in the through hole.

[0008] Furthermore, the drive mechanism includes a pressure frame, the movable slip ring is fixed on the pressure frame, and a pressure cylinder is installed on the top of the housing, with the piston rod of the pressure cylinder fixedly connected to the pressure frame.

[0009] Furthermore, a corrugated pipe is installed between the lower end of the filter body and the filtered liquid drainage assembly; the area opposite each filter body on the carrier plate is provided with inclined grooves, each groove having a different inclination, and the inclined grooves in the four areas of the carrier plate are symmetrical about four axes; the upper end of the filter body is provided with a slider that can slide along the inclined groove, and when the slider moves along the inclined groove toward the center of the carrier plate, multiple filter bodies come into contact with each other, causing the narrowing channel to surround the small-diameter pressurization channel; the nozzle is located on the upper side of the outer shell.

[0010] Furthermore, the driving mechanism includes a tensioning assembly and a motor. The tensioning assembly includes: a rope that is wrapped around multiple peripheral sliders and restricted to the peripheral sliders by limiting rings, with both ends of the rope being free ends; a rotating shaft that is rotatably mounted on both sides of the middle of the carrier plate, with reels mounted on the rotating shaft, and the free ends of the rope fixed to the opposite reels; and the motor is used to drive the rotating shaft to rotate.

[0011] Furthermore, a connecting rope is installed between two adjacent sliders, and a tension spring is installed between the outer slider and the inner wall of the outer casing.

[0012] Furthermore, the filtered liquid discharge assembly includes a column of tubes for connecting the lower end of each row of filter bodies, with a manifold fixed at one end of the column of tubes after passing through the outer shell; an on / off valve one is installed on the manifold, and a backwash pipe is also connected to the manifold, with an on / off valve two installed on the backwash pipe, allowing the backwash liquid to enter the filter body through the backwash pipe and the manifold; a drain port is installed directly below the outer shell.

[0013] Furthermore, branch pipes are installed between the upper ends of the nozzles in the same row. One end of the branch pipe passes through the outer casing and is connected to a pressure pipe, which is connected to a branch of the connecting pipe.

[0014] Furthermore, the discharge port of the coarse filter is connected in sequence to a buffer tank, a heat exchanger, and a suction pump. A connecting pipe is provided between the suction pump and one side of the outer casing, and a branch of the connecting pipe is connected to a pressure pipe.

[0015] The present invention has the following beneficial effects:

[0016] (1) This multi-stage collagen filtration device connects the coarse filter, heat exchanger, buffer tank, and fine filter through sealed pipelines. It utilizes the pipeline transport process to perform online heat exchange and cooling of the material, completely eliminating the need for cold storage and material transfer in traditional processes. This achieves continuous and automated production throughout the entire process, with "one filter equals one transfer, and discharge equals two filters." The fully enclosed operation greatly reduces the risk of material contamination, and, combined with the automatic control system, ensures the uniformity and stability of product quality.

[0017] (2) This collagen multi-stage filtration device, through a drive mechanism, radially expands the flexible filter bags of the filter body, forming a conical high-velocity channel with adjacent filter bags in contact, resulting in three favorable effects. First, the expansion of the filter bags generates tensile stress on the surface filter cake, causing it to break and reducing adhesion. Second, directional scouring: the cleaning liquid is directly sprayed onto the surface of the filter bags from the upper and lower nozzles, resulting in a strong impact. Third, the flow rate of the cleaning liquid surges as it flows through the conical channel with a constricted cross-section, generating stronger shear force and local negative pressure, tearing and sucking the filter cake away from the surface of the filter bags.

[0018] (3) This collagen multi-stage filtration device uses a sloping groove guide and a rope tensioning mechanism to make the filter body radially converge, forming a narrow pressurized cleaning channel. It also realizes online rinsing without stopping the machine, effectively extending the continuous working time.

[0019] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0020] Figure 1 This is an overall diagram of the present invention;

[0021] Figure 2 This is an external view of the fine filter in Embodiment 1 of the present invention;

[0022] Figure 3 This is a diagram showing the arrangement of the filter elements within the outer casing in Embodiment 1 of the present invention;

[0023] Figure 4 This is an assembly diagram of the filter body and the pressure frame of the present invention;

[0024] Figure 5 This is an external view of the filter body in Embodiment 1 of the present invention;

[0025] Figure 6 For the present invention Figure 5 Cross-sectional view;

[0026] Figure 7 For the present invention Figure 6 Exploded view;

[0027] Figure 8 This is a schematic diagram of the filtration state of the filter body of the present invention;

[0028] Figure 9 This is a schematic diagram of the filter bag expanding according to the present invention;

[0029] Figure 10 This is a top view of the filter body in its filtering state inside the outer casing in Embodiment 1 of the present invention;

[0030] Figure 11 This is a top view of the filter body forming a narrowed channel inside the outer shell in Embodiment 1 of the present invention;

[0031] Figure 12 This is a schematic diagram of the movable slip ring of the present invention on the carrier plate;

[0032] Figure 13 This is a schematic diagram of the structure of the tensioning component in Embodiment 2 of the present invention;

[0033] Figure 14 This is a top view of the arrangement of sliders in the filtering state of the filter body of the present invention;

[0034] Figure 15 This is a top view of the filter body of the present invention after the narrowed channel is formed.

[0035] In the diagram, 1. Coarse filter; 2. Heat exchanger; 3. Buffer tank; 4. Suction pump; 5. Pressure frame; 61. Pressure pipe; 62. Branch pipe; 63. Spray pipe; 7. Carrier plate; 71. Through hole; 72. Inclined groove; 8. Manifold; 9. Filter body; 91. Filter bag; 92. Inner cage; 921. Upper fixed seat; 922. Cage body; 923. Lower fixed seat; 93. Moving slip ring; 94. Elastic sheet; 10. Connecting pipe; 11. Feed inlet; 12. Drain outlet; 13. Tube; 14. Outer shell; 15. Pressure cylinder; 16. Conveying pipe; 17. Corrugated pipe; 18. Tensioning assembly; 181. Rotating shaft; 182. Winding reel; 183. Enclosing rope; 184. Connecting rope; 185. Tension spring; 186. Limiting ring; 19. Motor; 20. Slider. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0038] The following is based on Figures 1-15 This invention describes a collagen multi-stage filtration device provided in an embodiment of the invention.

[0039] Example 1, please refer to the figure, this embodiment of the invention provides a collagen multi-stage filtration device, including a coarse filter 1 and a fine filter. Specifically, the discharge port of the coarse filter 1 is sequentially connected to a buffer tank 3, a heat exchanger 2 and a suction pump 4. A connecting pipe 10 is provided between the suction pump 4 and one side of the outer shell 14. Collagen liquid is transported between the buffer tank 3 and the coarse filter 1, between the buffer tank 3 and the heat exchanger 2, and between the suction pump 4 and the heat exchanger 2 through a delivery pipe 16. The suction pump 4 is used to transport the coarsely filtered and cooled collagen to the fine filter.

[0040] It should be noted that various types of heat exchangers can be used. This embodiment uses a shell-and-tube heat exchanger, with the collagen solution flowing through the shell side.

[0041] During implementation, a forklift feeds collagen solution into coarse filter 1 for initial filtration (first filtration). The collagen solution after first filtration does not enter a cold storage for cooling; instead, it flows directly into a sealed collagen solution delivery pipeline fixedly connected to its outlet. This pipeline delivers the collagen solution into buffer tank 3, and then to heat exchanger 2 for heat exchange with water. After heat exchange, the collagen solution is directly and continuously delivered to suction pump 4, where its temperature has naturally dropped to the appropriate process temperature. Finally, suction pump 4 pumps the collagen solution into fine filter for further filtration. The entire process requires no interruption, achieving continuous production where the solution is immediately transferred after first filtration and immediately undergoes second filtration upon discharge.

[0042] like Figure 2 and Figure 3As shown, the fine filter includes a housing 14 and filter bodies 9 arrayed within the housing 14. Legs supporting the housing 14 are provided below it. Collagen liquid channels are formed between adjacent filter bodies 9. A connecting pipe 10 is installed at the outlet of the suction pump 4. An inlet 11 that cooperates with the connecting pipe 10 is provided in the lower part of one side of the housing 14, so that the collagen liquid drawn by the suction pump 4 can be fed from a lower position. This collagen liquid is referred to as unfiltered liquid. After passing through the collagen liquid channel and being filtered by the filter bodies 9, impurities remain on the outer surface of the filter bodies 9. The filtered liquid enters the interior of the filter bodies 9. A filtered liquid discharge assembly communicating with the outside is provided at the lower end of the filter bodies 9. The filtered liquid enters the filtered liquid discharge assembly from the bottom of the filter bodies 9 and is discharged to the next process.

[0043] Preferably, the filtered liquid discharge assembly includes a tube 13 for connecting the lower end of each row of filter bodies 9. One end of the tube 13 passes through the housing 14 and is fixed with a manifold 8. The filtered liquid enters the tube 13 and is discharged from the manifold 8.

[0044] After prolonged use, the filter cake on the outer surface of the filter body 9 becomes thick. Therefore, the filter cake can be treated by backwashing. In this embodiment, it is preferable to install an on / off valve one on the manifold 8 and connect a backwash pipe to the manifold 8. The backwash pipe is equipped with an on / off valve two, so that the backwash liquid can enter the filter body 9 through the backwash pipe and the manifold 8. When the backwash liquid passes through the filter body 9, it can wash away the filter cake on its outer surface.

[0045] Preferably, a drain port 12 is installed directly below the outer casing 14 for discharging the filter cake.

[0046] Since the backwashing process requires the equipment to pause filtration, resulting in overlapping filtration continuity, this embodiment adopts a method of changing the distance between adjacent filter bodies 9 to shorten the interval between two backwashes, so that the collagen liquid channel forms a narrow channel. When the channel narrows, the feed is no longer fed through the feed inlet 11, but the unfiltered liquid is sprayed into the narrow channel by direct injection. The narrow channel is smaller than the diameter of the entire housing 14, so the unfiltered liquid will be pressurized in the narrow channel, thereby flushing away the impurities on its outer surface. This can reduce the frequency of backwashing and thus extend the effective working time of the fine filter.

[0047] Combination Figures 2-4 In specific implementation, a drive mechanism is installed on the outer shell 14 to adjust the distance between the filter bodies 9. A nozzle 63 is provided in the area of ​​the outer shell 14 opposite to the narrowing channel, and the nozzle 63 is connected to the filtered collagen liquid. The nozzle 63 can spray collagen liquid (unfiltered liquid) into the narrowing channel. A carrier plate 7 is provided in the area near the top surface inside the outer shell 14. The carrier plate 7 is used to support the upper end of the filter body 9, and the tubes 13 are used to support the lower end of the filter body 9.

[0048] Furthermore, a branch pipe 62 is installed between the upper ends of the nozzles 63 in the same row. One end of the branch pipe 62 passes through the outer casing 14 and is connected to a pressure pipe 61. The pressure pipe 61 is connected to a branch of the connecting pipe 10. By switching the valves on the connecting pipe 10 and the branch pipe, the unfiltered liquid can be controlled to be fed through the feed inlet 11 or through the nozzles 63.

[0049] Specifically, in combination Figures 4-12 As shown, in order to achieve the above-mentioned narrowing of the channel, in this embodiment, the filter body 9 includes an inner cage 92, a movable slip ring 93 is sleeved on the upper end of the inner cage 92, a filter bag 91 and an elastic sheet 94 are fixed between the movable slip ring 93 and the lower end of the inner cage 92, the elastic sheet 94 is located in the interlayer between the inner cage 92 and the filter bag 91, and the driving mechanism is used to drive the movable slip ring 93 to slide axially, so that the elastic sheet 94 expands the movable slip ring 93.

[0050] In this embodiment, when the drive mechanism applies downward pressure to the movable slip ring 93, the movable slip ring 93 drives the upper end of the filter bag 91 and the elastic sheet 94 to slide downward on the inner cage 92, thereby thickening the middle region of the filter bag 91. Figure 9 As shown), after being expanded, the narrowed channel formed between the four adjacent filter bags 91 is a conical channel. The maximum radial points of the adjacent filter bags 91 will contact each other. This change will produce three effective changes: First, the filter cake will break due to the tensile stress of the expanded filter bags 91, reducing the stress on the filter bags 91 and making it easier to fall off; Second, the angle between the unfiltered liquid sprayed from the nozzle 63 of the filter bag 91 and the filter bag 91 will change, that is, the sprayed unfiltered liquid will be sprayed directly onto the outer surface of the filter bag 91, forming a direct scouring effect; Third, when the unfiltered liquid enters the small opening from the large opening of the conical channel, its flow rate increases, which will generate a negative pressure suction force on the surroundings, so that the filter cake can be better removed from the filter bag 91 by the suction force.

[0051] Preferably, the nozzle 63 is located inside the housing 14 on the upper and lower sides, and is used to spray collagen liquid into the tapered channels on the upper and lower sides.

[0052] Specifically, the upper nozzle 63 should be directly assembled on the carrier plate 7 in the area opposite to the conical channel, and the lower nozzle 63 is supported on the side wall of the housing 14 and is also opposite to the conical channel.

[0053] In practice, the upper and lower nozzles 63 should preferably work separately. For example, the upper nozzle 63 should work first to clean the upper part of the filter bag 91, and then the lower nozzle 63 should work to clean the lower part of the filter bag 91.

[0054] Preferably, a through hole 71 is provided on the area of ​​the carrier plate 7 opposite to the filter body 9. The inner cage 92 includes an upper fixed seat 921, a lower fixed seat 923 located below the upper fixed seat 921, and a cage body 922 installed between the upper fixed seat 921 and the lower fixed seat 923. The upper fixed seat 921 and the sliding ring 93 are both located in the through hole 71.

[0055] To achieve the lifting and lowering of the movable slip ring 93, the drive mechanism here includes a pressure frame 5, on which the movable slip ring 93 is fixed. A pressure cylinder 15 is installed on the top of the housing 14. The piston rod of the pressure cylinder 15 is fixedly connected to the pressure frame 5. When the pressure cylinder 15 extends, it can drive the pressure frame 5 to move downward, thereby pushing the movable slip ring 93 to move downward along the fixed seat 921 inside the through hole 71.

[0056] During operation, a forklift feeds collagen solution into the coarse filter 1 for initial filtration (first filtration). The collagen solution after the first filtration does not enter the cold storage for cooling; instead, it flows directly into a sealed collagen solution delivery pipeline fixedly connected to its outlet. This pipeline transports the collagen solution into the heat exchanger 2 for heat exchange with water. After heat exchange, the collagen solution is directly and continuously transported to the buffer tank 3, where its temperature has naturally dropped to the appropriate process temperature. Finally, it is pumped by the suction pump 4 into the fine filter for further filtration. The entire process requires no interruption, achieving continuous production where the solution is transferred immediately after the first filtration and undergoes a second filtration upon discharge.

[0057] When the fine filter is working, the unfiltered liquid passes through the collagen liquid channel and is filtered by the filter body 9. Impurities remain on the outer surface of the filter body 9, while the filtered liquid enters the interior of the filter body 9 and is discharged through the tube 13 and the manifold 8.

[0058] After working for a period of time, the pressure cylinder 15 is activated. When the pressure cylinder 15 extends, it can drive the pressure frame 5 to move downward, which in turn pushes the moving slip ring 93 to move downward along the upper fixed seat 921 within the through hole 71, thereby thickening the middle region of the filter bag 91. Figure 9 As shown, after being expanded, the narrowed channel formed between the four adjacent filter bags 91 is a conical channel. The maximum radial points of the adjacent filter bags 91 will contact each other. Then, the lower nozzle 63 sprays unfiltered liquid into the conical channel, and the upper nozzle 63 sprays unfiltered liquid into the conical channel. This change produces three effective changes: First, the filter cake breaks under the tensile stress of the expanded filter bags 91, reducing the stress on the filter bags 91 and making it easier to detach; Second, the angle between the unfiltered liquid sprayed from the nozzle 63 and the filter bags 91 changes, that is, the sprayed unfiltered liquid will be sprayed directly onto the outer surface of the filter bags 91, forming a direct scouring effect; Third, when the unfiltered liquid enters the narrow opening from the large opening of the conical channel, its flow velocity increases, which will generate negative pressure suction on the surroundings, so that the filter cake is attracted and can detach from the filter bags 91 more effectively.

[0059] After a longer period of time, backwashing is required. The backwash liquid can enter the filter body 9 through the backwash pipe and manifold 8. When the backwash liquid passes through the filter body 9, it can wash away the filter cake on its outer surface.

[0060] Example 2, as Figures 13-15 In this embodiment, instead of adjusting the expansion of the filter bag 91 to form a narrowing channel, the position of the filter body 9 is directly adjusted so that the four adjacent filter bodies 9 are tangent, thereby forming a small-diameter pressurization channel between the four adjacent filter bodies 9. At this time, the unfiltered liquid is introduced into the upper part of the small-diameter pressurization channel. Since the pressurization channel is relatively small compared to the diameter of the entire outer shell 14, the unfiltered liquid will be pressurized in the small-diameter pressurization channel, thereby flushing away the impurities on its outer surface. This can reduce the frequency of backwashing and thus extend the effective working time of the fine filter.

[0061] Specifically, a bellows 17 is installed between the lower end of the filter body 9 and the filtered liquid drainage assembly (tube 13). The flexibility of the bellows 17 does not restrict the displacement of the filter body 9. Inclined grooves 72 are formed in the area opposite each filter body 9 on the carrier plate 7. The inclination of each groove 72 is different, and the grooves 72 in the four areas of the carrier plate 7 are quadruple-axis symmetrical. Figure 14 As shown, the upper end of the filter body 9 is provided with a slider 20 that can slide along the inclined groove 72. When the slider 20 moves along the inclined groove 72 toward the center of the carrier plate 7, multiple filter bodies 9 come into contact with each other, making the narrowing channel into a small-diameter pressurizing channel; the nozzle 63 is located on the upper side of the outer shell 14.

[0062] In order to achieve the above-mentioned multiple filter elements 9 moving towards the center, forming Figure 15 In the shown state, the drive mechanism includes a tensioning assembly 18 and a motor 19. The tensioning assembly 18 includes a rope 183 and a rotating shaft 181. The rope 183 is wrapped around multiple outer sliders 20 and is restricted to the outer sliders 20 by a limiting ring 186. Both ends of the rope 183 are free ends. The rotating shaft 181 is rotatably mounted on both sides of the middle of the carrier plate 7. A winding wheel 182 is mounted on the rotating shaft 181. The free ends of the rope 183 are fixed to the opposite winding wheel 182. The motor 19 drives the rotating shaft 181 to rotate. When the rotating shaft 181 is working, it can drive the winding wheel 182 to rotate, so that the rope 183 can gradually tighten, causing the outer sliders 20 to slide in the inclined groove 72. At this time, the outer filter body 9 moves inward and gradually pushes the inner filter body 9 inward until it forms a... Figure 15 The state shown.

[0063] Preferably, in order to automatically reset the filter body 9 when the reel 182 unwinds, a connecting rope 184 is installed between two adjacent sliders 20, and a tension spring 185 is installed between the outer slider 20 and the inner wall of the outer casing 14. Due to the action of the tension spring 185, the outer filter body 9 automatically resets, and the outer filter body 9 pulls the inner filter body 9 through the connecting rope 184.

[0064] Furthermore, the rotating shaft 181 can be extended to the lower end of the filter body 9. A connecting rope 184 and a surrounding rope 183 are also provided at the lower end of the filter body 9 to ensure the vertical state of the filter body 9 after it is moved. The reset of the lower end of the filter body 9 is achieved by the reset of the bellows 17.

[0065] During operation, a forklift feeds collagen solution into the coarse filter 1 for initial filtration (first filtration). The collagen solution after the first filtration does not enter the cold storage for cooling; instead, it flows directly into a sealed collagen solution delivery pipeline fixedly connected to its outlet. This pipeline transports the collagen solution into the heat exchanger 2 for heat exchange with water. After heat exchange, the collagen solution is directly and continuously transported to the buffer tank 3, where its temperature has naturally dropped to the appropriate process temperature. Finally, it is pumped by the suction pump 4 into the fine filter for further filtration. The entire process requires no interruption, achieving continuous production where the solution is transferred immediately after the first filtration and undergoes a second filtration upon discharge.

[0066] When the fine filter is working, the unfiltered liquid passes through the collagen liquid channel and is filtered by the filter body 9. Impurities remain on the outer surface of the filter body 9, while the filtered liquid enters the interior of the filter body 9 and is discharged through the tube 13 and the manifold 8.

[0067] After working for a period of time, the control motor 19 operates, and the rotating shaft 181 drives the reel 182 to rotate, thereby gradually tightening the rope 183. This causes the outer slider 20 to slide within the inclined groove 72. At this time, the outer filter body 9 moves inward and gradually pushes the inner filter body 9 inward until a... Figure 15 As shown in the diagram, the unfiltered liquid from the connecting pipe 10 enters the pressure pipe 61 and is sprayed from the nozzle 63 into the small-diameter pressurization channel, thereby achieving the purpose of separating the filter cake from the filter body 9.

[0068] After a longer period of time, backwashing is required. The backwash liquid can enter the filter body 9 through the backwash pipe and manifold 8. When the backwash liquid passes through the filter body 9, it can wash away the filter cake on its outer surface.

[0069] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0070] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A multi-stage collagen filtration device, characterized in that, Includes a coarse filter (1) and a fine filter, for direct secondary filtration after primary filtration; The fine filter includes a housing (14) and filter bodies (9) arrayed within the housing (14). Collagen channels are formed between adjacent filter bodies (9). A drive mechanism is installed on the housing (14) to adjust the distance between adjacent filter bodies (9) so that the collagen channels form narrow channels. The area on the outer shell (14) opposite to the narrowing channel is provided with a nozzle (63), and the nozzle (63) is connected to a filtered collagen liquid. The area near the top surface inside the outer shell (14) is provided with a carrier plate (7), which is used to support the upper end of the filter body (9). The lower end of the filter body (9) is provided with a filtered liquid discharge assembly that communicates with the outside world; The filter body (9) includes an inner cage (92), with a sliding ring (93) fitted on the upper end of the inner cage (92). A filter bag (91) and an elastic sheet (94) are fixed between the sliding ring (93) and the lower end of the inner cage (92). The elastic sheet (94) is located in the interlayer between the inner cage (92) and the filter bag (91). The driving mechanism is used to drive each sliding ring (93) to slide along the axial direction, so that the elastic sheet (94) expands the filter bag (91), making the middle area of ​​the filter bag (91) thicker. After being expanded, the narrowed channel formed between the four adjacent filter bags (91) is a conical channel. The nozzle (63) is located on the upper and lower sides inside the outer shell (14) and is used to spray collagen liquid into the conical channels on the upper and lower sides. The area on the carrier plate (7) opposite to the filter body (9) has a through hole (71). The inner cage (92) includes an upper fixed seat (921), a lower fixed seat (923) located below the upper fixed seat (921), and a cage body (922) installed between the upper fixed seat (921) and the lower fixed seat (923). The upper fixed seat (921) and the sliding ring (93) are both located in the through hole (71). The nozzles (63) in the same row are set on the same branch pipe (62). One end of the branch pipe (62) passes through the outer shell (14) and is connected to a pressure pipe (61). The pressure pipe (61) is connected to a branch of the connecting pipe (10). The discharge port of the coarse filter (1) is connected in sequence to the buffer tank (3), the heat exchanger (2) and the suction pump (4). A connecting pipe (10) is provided between the suction pump (4) and one side of the outer shell (14). The branch pipe of the connecting pipe (10) is connected to the pressure pipe (61). An inlet (11) that cooperates with the connecting pipe (10) is provided in the area near the lower part of one side of the outer shell (14). After the collagen liquid is filtered by the filter body (9), the impurities remain on the outer surface of the filter body (9). When the channel narrows, the liquid is no longer fed through the inlet (11). Instead, the unfiltered liquid is sprayed into the narrowed channel by direct spraying.

2. The collagen multi-stage filtration device according to claim 1, characterized in that, The drive mechanism includes a pressure frame (5), the movable slip ring (93) is fixed on the pressure frame (5), and a pressure cylinder (15) is installed on the top of the housing (14). The piston rod of the pressure cylinder (15) is fixedly connected to the pressure frame (5).

3. The collagen multi-stage filtration device according to claim 1, characterized in that, The filtered liquid discharge assembly includes a tube (13) for connecting the lower end of the filter body (9) of each row, and a manifold (8) is fixed at one end of the tube (13) after passing through the outer shell (14). A first valve is installed on the manifold (8), and a backwash pipe is also connected to the manifold (8). A second valve is installed on the backwash pipe, and the backwash liquid can enter the filter body (9) through the backwash pipe and the manifold (8). A drain outlet (12) is installed directly below the outer casing (14).

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