A filtering device applied to fermented milk

Abstract

The present invention discloses a filtering device applied to fermented milk, which relates to the technical field of fermented milk filtration. The present invention includes a filtering tank. An inlet milk chamber and a filtering chamber are formed in the filtering tank from top to bottom. An inlet milk pipe is arranged outside the inlet milk chamber, and a milk discharge pipe is arranged outside the filtering chamber. A plurality of ultrafiltration membrane tubes are arranged inside the filtering chamber. A stirring rod is inserted into the ultrafiltration membrane tube, and the stirring rod can rotate. A plurality of installation windows are linearly arranged on the outer side of the stirring rod, and a swing rod is hinged inside the installation window. Through the arrangement of the stirring rod and the nozzle, the stirring rod rotates, and at the same time, the nozzle sprays gas, and the airflow is sprayed obliquely upward in a flat shape to cut the fermented milk, which helps to improve the fluidity of the liquid, reduce the local viscosity phenomenon, make the liquid flow more uniformly on the surface of the ultrafiltration membrane, contribute to improving the membrane flux, help reduce the accumulation of sediments and pollutants on the membrane surface, and has a high filtration efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of fermented milk filtration, and in particular to a filtration device applied to fermented milk. Background Art

[0002] Fermented milk refers to dairy products produced through microbial fermentation, including yogurt, lactic acid bacteria drinks, etc. As people's health awareness continues to improve, fermented milk products have become an important part of daily diet due to their probiotic functions and nutritional value. However, in the production process of fermented milk, there are often more solid impurities in the fermentation liquid, such as incompletely dissolved milk protein, bacteria produced during the fermentation process, lactose particles, etc. These impurities not only affect the taste and appearance of the product, but also may have an adverse effect on the health of consumers. Therefore, how to effectively remove these impurities to ensure the quality and stability of fermented milk has become an important issue facing the dairy industry.

[0003] At present, the filtration technology of fermented milk mainly includes physical filtration, membrane filtration and centrifugal separation. Among them, the most common is the membrane filtration method, which uses ultrafiltration membrane to effectively remove bacteria, yeast, milk fat particles and macromolecules (such as protein) in fermented milk. It can well separate large particles in the liquid and retain most of the nutrients in the emulsion, such as milk protein. In a Chinese patent (publication number: CN218650037U), a fermented milk production equipment is disclosed, including a casein pipeline, a whey protein pipeline, and a raw liquid supply device, a microfiltration membrane, an ultrafiltration membrane, a first dynamic mixer and a finished product preparation device connected in sequence.

[0004] This patent and the prior art have the following technical problems in actual use:

[0005] 1. Since fermented milk usually produces a higher viscosity during the fermentation process, especially the products fermented with probiotics, the formation of lactic acid, protein and polysaccharides increases the viscosity of the liquid, which makes the filtration process more difficult. The existing equipment directly performs filtration, and the filtration efficiency is low.

[0006] 2. Since fermented milk contains a large amount of fat, the fat can easily form a contaminant layer on the membrane surface, resulting in reduced membrane permeability and affecting filtration efficiency. Regular cleaning is required. In addition, the contamination layer formed on the membrane surface due to the attachment of fat is usually difficult to clean, especially under conventional cleaning methods. More frequent and stronger cleaning is required to restore the performance of the membrane, which increases the maintenance cost of the membrane. Summary of the invention

[0007] The purpose of the present invention is to solve the above-mentioned problem and provide a filtering device for fermented milk.

[0008] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0009] A filtering device for fermented milk, comprising a filtering tank, wherein a milk inlet cavity and a filtering cavity are provided inside the filtering tank from top to bottom, a milk inlet pipe is provided outside the milk inlet cavity, a milk discharge pipe is provided outside the filtering cavity, and a plurality of groups of ultrafiltration membrane tubes are provided inside the filtering cavity;

[0010] A stirring rod is inserted into the interior of the ultrafiltration membrane tube, and the stirring rod can rotate. A plurality of installation windows are provided in a linear array on the outer side of the stirring rod. A swing rod is hinged inside the installation window, and a hinge seat is hinged at the top of the swing rod. An air pressure chamber is provided inside the hinge seat. A piston screw rod is connected to the air pressure chamber with a sealing thread. A nozzle is provided at the top of the piston screw rod. The nozzle is designed in a straight line. A tension spring is provided between the piston screw rod and the air pressure chamber. The air pressure chamber is connected to an external air source. An air hole is provided through the interior of the piston screw rod. The radius of the air hole is smaller than the radius of the air pressure chamber. The nozzle is connected to the air pressure chamber through the air hole.

[0011] Furthermore, a sealing sleeve is provided between the installation window and the rocker arm.

[0012] Furthermore, an upper transmission cavity is opened inside the filter tank, and the upper transmission cavity is located above the milk inlet cavity. A stirring driving wheel and multiple groups of stirring driven wheels are rotatably installed on the top of the upper transmission cavity. The stirring driving wheel is meshed with one group of stirring driven wheels. The stirring rod passes through the upper transmission cavity and is fixedly connected to the stirring driven wheel. The multiple groups of stirring driven wheels on the outside are simultaneously meshed with the middle stirring driven wheel. A stirring motor is fixedly installed on the top of the filter tank, and the output end of the stirring motor is connected to the stirring driving wheel.

[0013] Furthermore, an outer gear one is provided at the bottom end of the rocker arm, a gear rod is inserted into the inside of the stirring rod, and the gear rod is simultaneously engaged with the outer gear one on multiple groups of rocker arms, a lower transmission chamber is opened inside the filter tank, the lower transmission chamber is located below the filter chamber, a top plate is slidably connected to the inside of the lower transmission chamber, the gear rod penetrates into the lower transmission chamber and is rotatably installed on the top plate, a top spring is provided between the top plate and the top of the lower transmission chamber, a cam is rotatably installed inside the lower transmission chamber, a drive motor is fixedly installed below the outer side of the filter tank, and the output end of the drive motor is connected to the cam.

[0014] Furthermore, a fixed wheel is fixedly installed on the inner wall of the installation window, a transmission cavity is opened inside the rocker arm, and a transmission wheel 1 and a transmission wheel 2 are rotatably installed inside the transmission cavity. A transmission pulley is fixedly installed on the outer side of the transmission wheel 1 and the transmission wheel 2, and the two sets of transmission pulleys are connected by a transmission belt transmission. The transmission wheel 2 is meshed with the fixed wheel, and an outer wheel tooth 2 is provided on the outer side of the articulated seat, and the transmission wheel 1 is meshed with the outer wheel tooth 2.

[0015] Furthermore, a locking rod is provided at the bottom of the nozzle, and a clamping ball is provided at the bottom of the locking rod. A spiral limiting groove is formed inside the swing rod, and the clamping ball can be screwed into the spiral limiting groove. Air cavities are formed on both sides of the inner wall of the transmission cavity, and the air cavities are connected to an external air source. A pressure rod is slidably connected inside the air cavity, and the pressure rod presses against both sides of the transmission belt. A compression spring is provided between the pressure rod and the inner wall of the air cavity.

[0016] Furthermore, an air pressure auxiliary pipe is provided inside the stirring rod, and a connecting air pipe is provided inside the swing rod. The connecting air pipe is connected to the air pressure auxiliary pipe. The connecting air pipe is connected to the air pressure cavity through a connecting bellows. An air pressure main pipe is provided inside the upper transmission cavity, and the air pressure main pipe is connected to an external air source. The air pressure main pipe is connected to the air pressure auxiliary pipe through a rotary sealing joint. The air cavity is connected to the connecting air pipe.

[0017] Furthermore, the external air source uses nitrogen.

[0018] Furthermore, the installation windows are opened on both sides of the stirring rod, and the two-sided installation windows are alternately distributed.

[0019] The beneficial effects of the present invention are as follows:

[0020] Through the setting of the stirring rod and the nozzle, during filtration, the stirring rod rotates, and at the same time, the nozzle sprays air, and the air flow is sprayed obliquely upward in a flat shape, cutting the fermented milk, helping to improve the fluidity of the liquid, reducing local viscosity phenomena, enabling the liquid to flow more evenly on the surface of the ultrafiltration membrane, contributing to improving the membrane flux. At the same time, the air flow blows obliquely on the membrane surface, helping to reduce the accumulation of sediments and pollutants on the membrane surface, and the filtration efficiency is high.

[0021] The present invention uses nitrogen to improve the filtration efficiency of fermented milk. Nitrogen will not react with the components in the fermented milk, so it will not affect the quality, taste, or nutritional components of the fermented milk. At the same time, it can reduce the solubility of oxygen, thereby reducing the aggregation and oxidation of fat particles and reducing membrane fouling.

[0022] By controlling the rotation of the nozzle, the sprayed air flow is vertically distributed in the radial direction of the ultrafiltration membrane tube and blows vertically against the inner wall of the ultrafiltration membrane tube. Then, the stirring rod drives the nozzle to rotate, which can first remove the pollutants on the surface of the ultrafiltration membrane, and then cooperate with backwashing to quickly complete the cleaning of the ultrafiltration membrane. The cleaning efficiency is high, and the maintenance cost is low. Description of the Drawings

[0023] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 is a schematic cross-sectional structure diagram of the overall structure of the present invention Figure 1 ;

[0025] Figure 3 is the schematic diagram of the overall sectional structure of the present invention Figure 2 ;

[0026] Figure 4 is the schematic sectional view of the ultrafiltration membrane tube of the present invention;

[0027] Figure 5 is the schematic sectional view of the stirring rod of the present invention;

[0028] Figure 6 is the exploded view of the swing rod structure of the present invention;

[0029] Figure 7 is the schematic sectional view of the swing rod of the present invention.

[0030] Reference numerals: 1, filtration tank; 2, upper transmission cavity; 21, stirring motor; 22, stirring driving wheel; 23, stirring driven wheel; 24, main air pressure pipe; 3, milk inlet cavity; 31, milk inlet pipe; 4, filtration cavity; 41, milk discharge pipe; 5, lower transmission cavity; 51, driving motor; 52, cam; 53, top plate; 54, top spring; 6, ultrafiltration membrane tube; 7, stirring rod; 71, installation window; 72, sealing sleeve; 73, auxiliary air pressure pipe; 74, toothed rod; 8, swing rod; 81, spiral limiting groove; 82, first external gear; 83, connecting air pipe; 84, connecting corrugated pipe; 85, first transmission wheel; 86, second transmission wheel; 87, fixed wheel; 88, pressing rod; 89, pressing spring; 9, hinge seat; 91, second external gear; 92, air pressure cavity; 93, tension spring; 10, nozzle; 101, piston screw rod; 102, locking rod. Detailed implementation manners

[0031] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0032] Embodiment 1, as Figures 1-7 shown, a filtering device applied to fermented milk includes a filtration tank 1. An upper milk inlet cavity 3 and a filtration cavity 4 are formed in the filtration tank 1 from top to bottom. A milk inlet pipe 31 is arranged outside the milk inlet cavity 3, a milk discharge pipe 41 is arranged outside the filtration cavity 4, and multiple groups of ultrafiltration membrane tubes 6 are arranged inside the filtration cavity 4;

[0033] Inside the ultrafiltration membrane tube 6 is inserted a stirring rod 7 which can rotate. A plurality of groups of mounting windows 71 are linearly arrayed on the outer side of the stirring rod 7. Inside the mounting window 71 is hinged a swing rod 8. The top end of the swing rod 8 is hinged with a hinge seat 9. Inside the hinge seat 9 is provided a pneumatic chamber 92. Inside the pneumatic chamber 92 is hermetically thread-connected a piston screw rod 101. The top end of the piston screw rod 101 is provided with a nozzle 10. The nozzle 10 is designed in a shape of a straight line. Between the piston screw rod 101 and the pneumatic chamber 92 is provided a tension spring 93. The pneumatic chamber 92 is connected to an external air source. Inside the piston screw rod 101 is penetrated with an air hole. The radius of the air hole is smaller than the radius of the pneumatic chamber 92. The nozzle 10 is connected to the pneumatic chamber 92 through the air hole.

[0034] Filtration: The fermented milk enters the milk inlet chamber 3 through the milk inlet pipe 31, and then enters the ultrafiltration membrane tube 6. At this time, the nozzle 10 sprays air. Since the nozzle 10 is designed in a shape of a straight line, the air flow sprays out in a flat shape and obliquely upward. At the same time, the flat air flow is distributed along the axial direction of the stirring rod 7, which can better cut the fermented milk. At the same time, as the stirring rod 7 drives the nozzle 10 to rotate, the swing rod 8 drives the nozzle 10 to swing up and down, which can disperse the fermented milk, help improve the fluidity of the liquid, reduce the local viscosity phenomenon, make the liquid flow more evenly on the surface of the ultrafiltration membrane, contribute to improving the membrane flux. At the same time, the air flow blows obliquely on the membrane surface, helping to reduce the accumulation of sediments and pollutants on the membrane surface. The filtration efficiency is high. The filtered fermented milk enters the filtration chamber 4 and then is discharged through the milk discharge pipe 41.

[0035] Membrane cleaning: Increase the air pressure. Since the radius of the air hole is smaller than the radius of the pneumatic chamber 92, the piston screw rod 101 is subjected to an increased air pressure and moves upward. Under the guiding action of the outer spiral part, it rotates 90 degrees. At this time, the air flow sprayed by the nozzle 10 is distributed radially and vertically along the stirring rod 7 and blows vertically against the inner surface of the ultrafiltration membrane tube 6. The generated blowing force is strong, which can generate sufficient cleaning force and has a wide cleaning range. Combined with the rotation of the stirring rod 7, it can perform circumferential cleaning on the inner surface of the ultrafiltration membrane tube 6. Then control the swing of the swing rod 8, and at the same time control the relative swing of the hinge seat 9 with respect to the swing rod 8, so that the nozzle 10 always maintains a vertical state without tilting, ensuring the cleaning force. Through the cooperation of multiple groups of nozzles 10, the inner surface of the ultrafiltration membrane tube 6 can be comprehensively cleaned. After the preliminary gas cleaning of the inner surface of the ultrafiltration membrane tube 6 is completed, backwashing can be carried out. The cleaning efficiency is high.

[0036] Furthermore, a sealing sleeve 72 is provided between the mounting window 71 and the swing rod 8. Through the setting of the sealing sleeve 72, the mounting window 71 can be designed to be larger than the width of the swing rod 8, so that the swing rod 8 has sufficient swing space.

[0037] It should be noted that in this embodiment, there is no limitation on the swing drive of the swing rod 8 and the hinge seat 9, which can be directly driven by a conventional motor. At the same time, the external air source pressure during filtration is smaller than that during cleaning.

[0038] Embodiment 2. On the basis of the above embodiment, it further includes that an upper transmission cavity 2 is formed inside the filtering tank 1. The upper transmission cavity 2 is located above the milk inlet cavity 3. A stirring driving wheel 22 and a plurality of stirring driven wheels 23 are rotatably installed at the top of the upper transmission cavity 2. The stirring driving wheel 22 meshes with one of the stirring driven wheels 23. The stirring rod 7 penetrates into the upper transmission cavity 2 and is fixedly connected to the stirring driven wheel 23. A plurality of outer stirring driven wheels 23 are simultaneously meshed with the middle stirring driven wheel 23. A stirring motor 21 is fixedly installed at the top of the filtering tank 1. The output end of the stirring motor 21 is connected to the stirring driving wheel 22.

[0039] By controlling the energization of the stirring motor 21, the stirring motor 21 drives the stirring driving wheel 22 to rotate. The stirring driving wheel 22 drives the outer stirring driven wheels 23 to rotate. The outer stirring driven wheels 23 drive the middle stirring driven wheel 23 to rotate. The middle stirring driven wheel 23 drives the remaining outer stirring driven wheels 23 to rotate simultaneously. The plurality of stirring driven wheels 23 rotate simultaneously. The stirring driven wheels 23 drive the plurality of stirring rods 7 to rotate synchronously. The transmission is stable and will not affect the fermented milk.

[0040] Embodiment 3. On the basis of the above embodiment, it further includes that an outer gear tooth 82 is arranged at the bottom end of the swing rod 8. A toothed rod 74 is inserted inside the stirring rod 7. The toothed rod 74 is simultaneously meshed with the outer gear teeth 82 on the plurality of swing rods 8. A lower transmission cavity 5 is formed inside the filtering tank 1. The lower transmission cavity 5 is located below the filtering cavity 4. A top disc 53 is slidably connected inside the lower transmission cavity 5. The toothed rod 74 penetrates into the lower transmission cavity 5 and is rotatably installed on the top disc 53. A top spring 54 is arranged between the top disc 53 and the inner top of the lower transmission cavity 5. A cam 52 is rotatably installed inside the lower transmission cavity 5. A driving motor 51 is fixedly installed below the outside of the filtering tank 1. The output end of the driving motor 51 is connected to the cam 52.

[0041] Since the toothed rod 74 is rotatably installed on the top disc 53, when the toothed rod 74 rotates following the stirring rod 7, the top disc 53 will not interfere. When it is necessary to control the swing of the swing rod 8, control the driving motor 51 to be energized. The driving motor 51 drives the cam 52 to rotate. Under the action of the cam 52 and the top spring 54, the top disc 53 slides up and down. The top disc 53 drives the toothed rod 74 to move up and down. The toothed rod 74 drives the swing rod 8 to swing up and down through the outer gear tooth 82. And the plurality of swing rods 8 swing up and down synchronously. The control structure is simple. Therefore, in this embodiment, there is no need to additionally provide a drive for each swing rod 8. Only one set of driving motor 51 needs to be provided. And it will not contact the fermented milk during transmission.

[0042] Embodiment 4, on the basis of the above embodiment, further includes that a fixed wheel 87 is fixedly installed on the inner wall of the installation window 71. A transmission cavity is formed inside the swing rod 8. A first transmission wheel 85 and a second transmission wheel 86 are rotatably installed inside the transmission cavity. Transmission belt wheels are fixedly installed on the outer sides of the first transmission wheel 85 and the second transmission wheel 86. The two groups of transmission belt wheels are connected by a transmission belt. The second transmission wheel 86 meshes with the fixed wheel 87. Outer gear teeth II 91 are arranged on the outer side of the hinge seat 9. The first transmission wheel 85 meshes with the outer gear teeth II 91.

[0043] The control drive motor 51 is powered on. The drive motor 51 drives the cam 52 to rotate. Under the action of the cam 52 and the top spring 54, the top plate 53 slides up and down. The top plate 53 drives the toothed rod 74 to move up and down. The toothed rod 74 drives the swing rod 8 to swing up and down through the outer gear teeth I 82. And multiple groups of swing rods 8 swing up and down synchronously. The swing rod 8 drives the second transmission wheel 86 to rotate relative to the fixed wheel 87. Under the action of the fixed wheel 87, the second transmission wheel 86 rotates on its own axis. The second transmission wheel 86 drives the first transmission wheel 85 to rotate through the transmission belt wheel. The first transmission wheel 85 drives the hinge seat 9 to swing through the outer gear teeth II 91. It should be noted that the rotation direction of the second transmission wheel 86 is the same as the swing direction of the swing rod 8. Therefore, the rotation direction of the first transmission wheel 85 is the same as the swing direction of the swing rod 8. So the swing direction of the hinge seat 9 is opposite to the swing direction of the swing rod 8. Therefore, it can ensure that the nozzle 10 always remains vertical and will not tilt, and there is no need to additionally apply drive to the hinge seat 9.

[0044] Embodiment 5, on the basis of the above embodiment, further includes that a locking rod 102 is arranged at the bottom of the nozzle 10. A clamping ball is arranged at the bottom of the locking rod 102. A spiral limiting groove 81 is formed inside the swing rod 8. The clamping ball can be screwed into the spiral limiting groove 81. Air cavities are formed on both sides of the inner wall of the transmission cavity. The air cavities are connected to an external air source. A pressure rod 88 is slidably connected inside the air cavity. The pressure rod 88 presses against both sides of the transmission belt. A compression spring 89 is arranged between the pressure rod 88 and the inner wall of the air cavity.

[0045] Although the previous embodiment can realize synchronous driving of the articulated seat 9, the articulated seat 9 always has to swing in the opposite direction relative to the swing rod 8, resulting in that the angle of the nozzle 10 remains unchanged during filtration, and the effect of improving the fluidity of the liquid is poor. Therefore, through the arrangement of this embodiment, during filtration, the piston screw rod 101 is in an inserted state, the card ball is located in the spiral limiting groove 81, and the locking rod 102 can limit the swing of the articulated seat 9 relative to the swing rod 8. At the same time, the thrust given to the pressure rod 88 by the air pressure is small, and the pressure given to the transmission belt by the pressure rod 88 is small. The transmission belt is in a relaxed state, and the transmission wheel 2 86 can rotate relative to the transmission wheel 1 85. Therefore, when the swing rod 8 swings up and down at this time, the articulated seat 9 swings synchronously with the swing rod 8. When cleaning, the air pressure is increased. Since the radius of the air hole is smaller than the radius of the air pressure chamber 92, the piston screw rod 101 is affected by the increased air pressure. The piston screw rod 101 moves upward and rotates 90 degrees under the guidance of the outer spiral part. The piston screw rod 101 drives the nozzle 10 to spiral upward, and the nozzle 10 drives the card ball to rotate out of the spiral limiting groove 81. The articulated seat 9 can swing relative to the rocker 8. At the same time, the air pressure gives a greater thrust to the pressure rod 88, and the pressure of the pressure rod 88 to the transmission belt is greater. The transmission belt is in a taut state. The transmission wheel 2 86 can drive the transmission wheel 1 85 to rotate. When the rocker 8 swings up and down, the articulated seat 9 swings in the opposite direction relative to the rocker 8.

[0046] Through the arrangement of this embodiment, when the device is filtering, the articulated seat 9 and the rocker arm 8 swing as a whole. When cleaning, the articulated seat 9 swings in the opposite direction relative to the rocker arm 8, ensuring that sufficient separation effect can be produced during filtration to increase the fluidity of the fermented milk, and sufficient cleaning force can be produced during cleaning.

[0047] Embodiment 6, on the basis of the above embodiments, further includes: a pneumatic auxiliary pipe 73 is provided inside the stirring rod 7, a connecting air pipe 83 is provided inside the rocker arm 8, the connecting air pipe 83 is connected to the pneumatic auxiliary pipe 73, the connecting air pipe 83 is connected to the pneumatic cavity 92 through the connecting bellows 84, a pneumatic main pipe 24 is provided inside the upper transmission cavity 2, the pneumatic main pipe 24 is connected to the external air source, the pneumatic main pipe 24 is connected to the pneumatic auxiliary pipe 73 through a rotating sealing joint, and the air cavity is connected to the connecting air pipe 83.

[0048] With this design, when the stirring rod 7 drives the air pressure auxiliary pipe 73 to rotate, it will not affect the connectivity with the air pressure main pipe 24, and through the setting of the connecting bellows 84, it will not interfere with the swing of the hinge seat 9.

[0049] Furthermore, nitrogen is used as the external gas source, which will not react with the ingredients in the fermented milk, and thus will not affect the quality of the fermented milk or its taste and nutritional components. At the same time, it can reduce the solubility of oxygen, thereby reducing the aggregation and oxidation of fat particles and reducing membrane pollution.

[0050] Furthermore, installation windows 71 are opened on both sides of the stirring rod 7, and the installation windows 71 on both sides are alternately distributed. With this design, while ensuring the complete cleaning of the ultrafiltration membrane tube 6, the number of swing rods 8 can be reduced, and the cost can be lowered.

[0051] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A filtering device applied to fermented milk, comprising a filtering tank (1), characterized in that, Inside the filter tank (1), a milk inlet chamber (3) and a filtration chamber (4) are provided from top to bottom. A milk inlet pipe (31) is arranged outside the milk inlet chamber (3), and a milk discharge pipe (41) is arranged outside the filtration chamber (4). A plurality of ultrafiltration membrane tubes (6) are arranged inside the filtration chamber (4); A stirring rod (7) is inserted inside the ultrafiltration membrane tube (6). The stirring rod (7) can rotate. A plurality of installation windows (71) are linearly arranged on the outer side of the stirring rod (7). A swing rod (8) is hinged inside the installation window (71). The top end of the swing rod (8) is hinged with a hinge seat (9). An air pressure chamber (92) is arranged inside the hinge seat (9). A piston screw rod (101) is hermetically screwed inside the air pressure chamber (92). A nozzle (10) is arranged at the top end of the piston screw rod (101). The nozzle (10) is designed in a shape of a straight line. A tension spring (93) is arranged between the piston screw rod (101) and the air pressure chamber (92). The air pressure chamber (92) is communicated with an external air source. An air hole is penetrated inside the piston screw rod (101). The radius of the air hole is smaller than the radius of the air pressure chamber (92). The nozzle (10) is communicated with the air pressure chamber (92) through the air hole; An external first gear (82) is arranged at the bottom end of the swing rod (8). A toothed rod (74) is inserted inside the stirring rod (7). The toothed rod (74) meshes with the external first gears (82) on a plurality of swing rods (8) at the same time. A lower transmission chamber (5) is arranged inside the filter tank (1). The lower transmission chamber (5) is located below the filtration chamber (4). A top disc (53) is slidably connected inside the lower transmission chamber (5). The toothed rod (74) penetrates into the lower transmission chamber (5) and is rotatably installed on the top disc (53). A top spring (54) is arranged between the top disc (53) and the inner top of the lower transmission chamber (5). A cam (52) is rotatably installed inside the lower transmission chamber (5). A drive motor (51) is fixedly installed below the outside of the filter tank (1). The output end of the drive motor (51) is connected with the cam (52). A fixed wheel (87) is fixedly installed on the inner wall of the installation window (71). A transmission chamber is arranged inside the swing rod (8). A first transmission wheel (85) and a second transmission wheel (86) are rotatably installed inside the transmission chamber. Transmission belt wheels are fixedly installed on the outer sides of the first transmission wheel (85) and the second transmission wheel (86). The two transmission belt wheels are connected by a transmission belt. The second transmission wheel (86) meshes with the fixed wheel (87). An external second gear (91) is arranged on the outside of the hinge seat (9). The first transmission wheel (85) meshes with the external second gear (91).

2. The filtering device for fermented milk according to claim 1, wherein, A sealing sleeve (72) is arranged between the installation window (71) and the swing rod (8).

3. The filtering device for fermented milk according to claim 2, characterized in that, An upper driving cavity (2) is formed inside the filtering tank (1). The upper driving cavity (2) is located above the milk inlet cavity (3). A stirring driving wheel (22) and a plurality of stirring driven wheels (23) are rotatably installed at the top of the upper driving cavity (2). The stirring driving wheel (22) is engaged with one of the stirring driven wheels (23). The stirring rod (7) penetrates into the upper driving cavity (2) and is fixedly connected to the stirring driven wheel (23). The plurality of outer stirring driven wheels (23) are simultaneously engaged with the middle stirring driven wheel (23). A stirring motor (21) is fixedly installed at the top of the filtering tank (1). The output end of the stirring motor (21) is connected to the stirring driving wheel (22).

4. A filtering device applied to fermented milk according to claim 3, characterized in that, A locking rod (102) is arranged at the bottom of the nozzle (10). A clamping ball is arranged at the bottom of the locking rod (102). A spiral limiting groove (81) is formed inside the swing rod (8). The clamping ball can be screwed into the spiral limiting groove (81). Air cavities are formed on both sides of the inner wall of the transmission cavity. The air cavities are communicated with an external air source. A pressure rod (88) is slidably connected inside the air cavity. The pressure rod (88) presses against both sides of the transmission belt. A compression spring (89) is arranged between the pressure rod (88) and the inner wall of the air cavity.

5. A filtering device applied to fermented milk according to claim 4, characterized in that, An air pressure auxiliary pipe (73) is arranged inside the stirring rod (7). A connecting air pipe (83) is arranged inside the swing rod (8). The connecting air pipe (83) is communicated with the air pressure auxiliary pipe (73). The connecting air pipe (83) is communicated with the air pressure cavity (92) through a connecting corrugated pipe (84). An air pressure main pipe (24) is arranged inside the upper driving cavity (2). The air pressure main pipe (24) is communicated with an external air source. The air pressure main pipe (24) is communicated with the air pressure auxiliary pipe (73) through a rotary sealing joint. The air cavity is communicated with the connecting air pipe (83).

6. The filtering device for fermented milk according to claim 5, wherein, The external air source uses nitrogen.

7. The filtering device for fermented milk according to claim 6, characterized in that, Installation windows (71) are formed on both sides of the stirring rod (7), and the two side installation windows (71) are alternately distributed.

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