Lactobacillus fermentation equipment for preparing exopolysaccharides

Abstract

The invention provides lactic acid bacteria fermentation equipment for preparing exopolysaccharides, and relates to the field of lactic acid bacteria fermentation, the lactic acid bacteria fermentation equipment comprises a fermentation tank, the top of the fermentation tank is provided with a tank cover, the top of the tank cover is provided with a feed port and an exhaust valve, the bottom of the fermentation tank is provided with a discharge port, and the lactic acid bacteria fermentation equipment further comprises an air supply mechanism and a stirring mechanism; by arranging the reversing mechanism and the stirring mechanism, air is controlled to be discharged from air outlets in the bottoms of different groups of exhaust pipes through the reversing mechanism, the rotation directions of the exhaust pipes are continuously changed while rotation of the exhaust pipes is achieved, air is injected into lactic acid bacteria liquid from all positions, the uniformity of air dispersion is improved, and the uniformity of air dispersion is improved. Meanwhile, in the rotating process of the air supply pipe, the lactic acid bacteria liquid is stirred through the stirring mechanism, the air dispersion uniformity is further improved, and the effect of further improving the lactic acid bacteria fermentation speed is achieved.

Description

Technical Field

[0001] This invention belongs to the field of lactic acid bacteria fermentation technology, specifically a lactic acid bacteria fermentation device for preparing extracellular polysaccharides. Background Technology

[0002] Extracellular polysaccharides of lactic acid bacteria are secondary metabolites produced during the growth and metabolism of lactic acid bacteria. They can loosely adhere to the cell surface, called capsular polysaccharides, or be directly secreted into the extracellular environment, called mucopolysaccharides. Both capsular and mucopolysaccharides are collectively referred to as extracellular polysaccharides, products of microbial adaptation to environmental changes. Because lactic acid bacteria are widely recognized as safe food-grade microorganisms, their extracellular polysaccharides are also considered to have good biocompatibility. They are diverse, widely sourced, and possess various structural and functional properties, finding wide application in the food, pharmaceutical, and chemical industries.

[0003] Lactic acid bacteria strains from different sources exhibit significant differences in the yield and structural characteristics of extracellular polysaccharides under different growth and fermentation conditions. These differences affect the physicochemical properties, biological activity, and applications of extracellular polysaccharides. For some aerobic lactic acid bacteria strains, strains located in the center of the cell have difficulty contacting air during fermentation, resulting in a slower fermentation rate and thus affecting the overall preparation speed of lactic acid bacteria.

[0004] In summary, the present invention provides a lactic acid bacteria fermentation apparatus for preparing extracellular polysaccharides to solve the above-mentioned problems. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a lactic acid bacteria fermentation device for preparing extracellular polysaccharides, which is achieved by the following specific technical means: A lactic acid bacteria fermentation device for preparing extracellular polysaccharides includes a fermenter, a lid on the top of the fermenter, an inlet and an exhaust valve on the top of the lid, an outlet at the bottom of the fermenter, and also includes an air supply mechanism and a stirring mechanism. The gas supply mechanism includes a gas supply pipe installed through the center of the tank cover and a gas pump installed on the top of the tank cover. The gas pump is connected to the top of the gas supply pipe via a conduit. A cylindrical block is fixedly connected to the bottom of the gas supply pipe. An exhaust pipe is connected to the outside of the cylindrical block. A cylindrical groove is formed inside the cylindrical block. A hollow tube is installed in the center of the cylindrical groove and is connected to the exhaust pipe. The top of the hollow tube is rotatably connected to the cylindrical block, and the bottom of the hollow tube passes through the cylindrical block and is fixedly connected to the bottom of the fermenter. Ventilation holes are formed at the top and bottom of the portion of the hollow tube located inside the cylindrical groove. A sliding tube is slidably fitted on the outside of the hollow tube. Sealing plates are provided at the top and bottom of the sliding tube. A reversing mechanism is also provided inside the cylindrical groove. The stirring mechanism includes stirring blades disposed on the outside of the air supply pipe.

[0006] Furthermore, there are two sets of exhaust pipes, and the two sets of exhaust pipes are arranged in a staggered circular pattern around the cylindrical block. The two sets of air supply pipes are respectively connected to the cylindrical groove from the top and bottom of the cylindrical block. The bottom of each air supply pipe is provided with an air outlet at an angle, and the air outlets on the two sets of air supply pipes are in opposite directions.

[0007] Furthermore, the reversing mechanism includes an installation groove on the outer wall of the slide tube, a fixed shaft is fixedly installed at the center of the installation groove, a gear is rotatably installed on the outer side of the fixed shaft away from the inner wall of the installation groove, a first magnet is fitted on the surface of the fixed shaft inside the installation groove, and the gear and the first magnet are fixedly connected by a connecting plate. The reversing mechanism also includes an arc-shaped rack provided on the side wall of the cylindrical groove. There are two arc-shaped racks, and the projection positions of the two arc-shaped racks on the horizontal plane and their heights in the vertical direction are staggered, and both arc-shaped racks can mesh with the gear.

[0008] Furthermore, the reversing mechanism also includes two second magnets respectively embedded in the top and bottom of the cylindrical groove, and the magnetic poles on opposite sides of the two second magnets are the same.

[0009] Furthermore, a fixing rod is provided at the top of the fixing shaft between the first magnet and the gear, and an arc-shaped plate is fixedly connected to the top of the fixing rod around the gear. Limiting plates are provided on the side wall of the cylindrical groove near the top of each first magnet.

[0010] Furthermore, the stirring mechanism includes multiple stirring blades, and the end of each stirring blade near the air supply pipe is rotatably connected to the air supply pipe. The multiple stirring blades are parallel to each other and equidistantly distributed in the vertical direction. The stirring mechanism also includes a pull rod and a connecting rod. The two ends of the pull rod are respectively connected to the can lid and the stirring blade near the can lid through ball joints. The connecting rod is arranged parallel to the air supply pipe and is rotatably connected to each of the stirring blades.

[0011] Furthermore, a heater for heating the gas passing through the conduit is provided in the middle of the conduit.

[0012] Furthermore, the top and bottom of the mounting groove are provided with sliding grooves, and springs and spherical blocks are installed inside the sliding grooves. The spherical blocks are slidably connected to the sliding grooves, and the spherical blocks are located near the opening of the sliding grooves. The ends of the two poles of the first magnet are provided with limiting grooves, and the limiting grooves correspond to the positions of the spherical blocks.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention uses an air supply mechanism to inject air into the exhaust pipe through a conduit, air supply pipe, hollow pipe, vent hole, and cylindrical groove by an air pump. The air is then injected into the lactic acid bacteria liquid from the air outlet at the bottom of the exhaust pipe, providing the lactic acid bacteria strains in the center of the liquid with the oxygen required for fermentation, thereby improving the overall fermentation speed of the lactic acid bacteria.

[0014] 2. This invention utilizes a reversing mechanism and a stirring mechanism. The reversing mechanism controls air to be discharged from the outlets at the bottom of different groups of exhaust pipes. While the exhaust pipes rotate, the rotation direction of the exhaust pipes is continuously changed, allowing air to be injected into the lactic acid bacteria liquid from various positions, thus improving the uniformity of air dispersion. At the same time, during the rotation of the air supply pipe, the stirring mechanism stirs the lactic acid bacteria liquid, further improving the uniformity of air dispersion, thereby further increasing the fermentation speed of lactic acid bacteria. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of the present invention; Figure 2 This is a three-dimensional sectional view of the present invention; Figure 3 This is a schematic cross-sectional view of the present invention; Figure 4 This is the present invention. Figure 2 A magnified view of a portion of point A in the middle; Figure 5 This is the present invention. Figure 3 A magnified view of a portion of point B in the middle; Figure 6 This is the present invention. Figure 5 A magnified view of a portion of point C in the middle; Figure 7 This is the present invention. Figure 5 A magnified view of a portion of point D in the middle; Figure 8 This is a three-dimensional schematic diagram of the gear and the first magnet in this invention.

[0016] In the picture: 1. Fermentation tank; 101. Tank lid; 102. Feed inlet; 103. Exhaust valve; 104. Discharge outlet; 2. Gas supply mechanism; 201. Gas supply pipe; 202. Air pump; 203. Cylindrical block; 204. Exhaust pipe; 205. Cylindrical groove; 206. Hollow tube; 207. Vent hole; 208. Slide tube; 209. Sealing plate; 210. Gas outlet; 3. Stirring mechanism; 301. Stirring blade; 302. Tie rod; 303. Connecting rod; 4. Reversing mechanism; 401. Mounting groove; 402. Fixed shaft; 403. Gear; 404. First magnet; 405. Connecting plate; 406. Arc rack; 407. Second magnet; 5. Fixed rod; 6. Arc plate; 7. Limiting plate; 8. Heater; 9. Slide groove; 10. Spring; 11. Spherical block; 12. Limiting groove. Detailed Implementation

[0017] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0018] like Figure 1-8 As shown, the present invention provides a lactic acid bacteria fermentation device for preparing extracellular polysaccharides, including a fermentation tank 1, a tank cover 101 on the top of the fermentation tank 1, a feed inlet 102 and an exhaust valve 103 on the top of the tank cover 101, a discharge outlet 104 on the bottom of the fermentation tank 1, and also includes an air supply mechanism 2 and a stirring mechanism 3. At the start of fermentation, the lactic acid bacteria liquid is added into the fermentation tank 1 through the inlet 102. After fermentation is completed, it is discharged through the outlet 104. During this process, the fermentation speed of the lactic acid bacteria is increased by the gas supply mechanism 2 and the stirring mechanism 3. Excess gas in the fermentation tank 1 is discharged through the exhaust valve 103. It should be noted that both the inlet 102 and the outlet 104 are equipped with baffles, and the opening and closing of the inlet 102 and the outlet 104 can be controlled as needed.

[0019] The gas supply mechanism 2 includes a gas supply pipe 201 installed through the center of the tank cover 101 and a gas pump 202 installed on the top of the tank cover 101. The gas pump 202 is connected to the top of the gas supply pipe 201 via a conduit, and the conduit and the gas supply pipe 201 are rotatably connected. A cylindrical block 203 is fixedly connected to the bottom end of the gas supply pipe 201. An exhaust pipe 204 is connected to the outside of the cylindrical block 203. A cylindrical groove 205 is opened inside the cylindrical block 203, and a hollow core is installed in the center of the cylindrical groove 205. The hollow tube 206 is connected to the exhaust pipe 204. The top end of the hollow tube 206 is rotatably connected to the cylindrical block 203, and the bottom end passes through the cylindrical block 203 and is fixedly connected to the bottom of the fermentation tank 1. Ventilation holes 207 are provided at the top and bottom of the part of the hollow tube 206 located inside the cylindrical groove 205. A sliding tube 208 is slidably sleeved on the outside of the hollow tube 206. Sealing plates 209 are provided at the top and bottom of the sliding tube 208. A reversing mechanism 4 is also provided inside the cylindrical groove 205. The stirring mechanism 3 includes stirring blades 301 disposed outside the air supply pipe 201.

[0020] During the lactic acid bacteria fermentation process, air is injected into the air supply pipe 201 through the air pump 202. The air then enters the hollow pipe 206 from the air supply pipe 201, and then enters the cylindrical groove 205 through the vent holes 207 at the top or bottom of the hollow pipe 206. Finally, it enters the exhaust pipe 204 from the cylindrical groove 205 and is discharged into the fermentation tank 1, thereby providing the lactic acid bacteria with the oxygen required for fermentation. At the same time, the stirring mechanism 3 can stir the lactic acid bacteria liquid, so that the air can be fully dispersed into the lactic acid bacteria liquid, so that the lactic acid bacteria in all parts of the fermentation tank 1 can obtain the required oxygen.

[0021] As a preferred embodiment of the present invention, there are two sets of exhaust pipes 204, and the two sets of exhaust pipes 204 are arranged in a staggered circumference around the cylindrical block 203. The two sets of air supply pipes 201 are connected to the cylindrical groove 205 from the top and bottom of the cylindrical block 203, respectively. The bottom of each air supply pipe 201 is provided with an air outlet 210 at an incline, and the air outlets 210 provided on the two sets of air supply pipes 201 are in opposite directions.

[0022] When air is discharged from the outlet 210, the gas will generate a reaction force on the exhaust pipe 204. Since the outlet 210 is inclined, the reaction force will cause the exhaust pipe 204 to rotate. Since the bottom outlets 210 of different sets of exhaust pipes 204 are inclined in opposite directions, when air is discharged from the bottom outlets 210 of different sets of air supply pipes 201, the exhaust pipe 204 will drive the air supply pipe 201 to rotate in different directions.

[0023] As a preferred embodiment of the present invention, the reversing mechanism 4 includes an installation groove 401 opened on the outer wall of the slide tube 208. A fixed shaft 402 is fixedly arranged at the center of the installation groove 401. A gear 403 is rotatably installed on the outer side of the fixed shaft 402 away from the inner wall of the installation groove 401. A first magnet 404 is fitted on the surface of the fixed shaft 402 inside the installation groove 401. The gear 403 and the first magnet 404 are fixedly connected by a connecting plate 405. The reversing mechanism 4 also includes an arc-shaped rack 406 arranged on the side wall of the cylindrical groove 205. There are two arc-shaped racks 406. The projection positions of the two arc-shaped racks 406 on the horizontal plane and their heights in the vertical direction are staggered. Both arc-shaped racks 406 can mesh with the gear 403.

[0024] As a preferred embodiment of the present invention, the reversing mechanism 4 further includes two second magnets 407 respectively embedded in the top and bottom of the cylindrical groove 205, and the magnetic poles of the two second magnets 407 on opposite sides are the same.

[0025] As a preferred technical solution of the present invention, a fixing rod 5 is provided at the top of the fixing shaft 402 between the first magnet 404 and the gear 403. An arc-shaped plate 6 is fixedly connected to the top of the fixing rod 5 around the gear 403. A limiting plate 7 is provided on the side wall of the cylindrical groove 205 at a position close to the top of each first magnet 404. The distance between the limiting plate 7 and the arc-shaped rack 406 can accommodate the arc-shaped plate 6 and the gear 403 to enter while maintaining the meshing between the gear 403 and the arc-shaped rack 406.

[0026] The gas discharge is controlled by the reversing mechanism 4. Since the first magnet 404 is located between the two second magnets 407, and the magnetic poles of the two second magnets 407 are the same on opposite sides, one end of the first magnet 404 attracts the opposite pole of one of the second magnets 407, and the other end repels the like pole of the other second magnet 407. This causes the first magnet 404 to drive the slide tube 208 to remain at the top / bottom of the cylindrical groove 205, thereby sealing the vent 207 at the top / bottom of the hollow tube 206. After that, air can only enter the cylindrical groove 205 from the bottom / top of the hollow tube 206. The air enters from the cylindrical groove 205 and flows into a set of exhaust pipes 204 that connect to the cylindrical block 203 from the bottom / top. It then exits from the outlet 210 at the bottom of the same set of exhaust pipes 204. During the air expulsion process, the reaction force causes the exhaust pipes 204 to rotate the cylindrical block 203 relative to the slide tube 208 until the gear 403 meshes with the arc-shaped rack 406 at a higher / lower position. Afterward, the cylindrical block 203 continues to rotate, and under the action of the arc-shaped rack 406, the gear 403 rotates along with the cylindrical block 203. The gear 403 drives the first gear fixedly connected to it... As the first magnet 404 rotates and flips, the limiting plate 7 restricts the arc-shaped plate 6 from moving downwards or upwards, thus keeping the gear 403 engaged with the arc-shaped rack 406. This continues until the first magnet 404 flips 180 degrees, at which point the gear 403 separates from the arc-shaped rack 406 and leaves the area of ​​the limiting plate 7. Because the magnetic poles at both ends of the first magnet 404 are reversed after the 180-degree flip, the second magnet 407, which was previously repelled by it, will attract it, while the previously attracted magnets will repel it. This causes the first magnet 404 to move the slide tube 208. The cylinder moves downwards / upwards, thereby sealing the vent 207 at the bottom / top of the hollow tube 206, allowing air to be discharged from the outlet 210 at the bottom of another set of exhaust pipes 204. This causes the cylindrical block 203 to begin to reverse until the gear 403 meshes with the arc-shaped rack 406 at a lower / higher position. The rotation process of the first magnet 404 is then repeated, creating a continuous cycle that causes the exhaust pipe 204 to perform forward and reverse rotations. During this rotation, the position of the air discharged from the lactic acid bacteria liquid is continuously changed, thereby further improving the uniformity of air dispersion within the lactic acid bacteria liquid.

[0027] As a preferred technical solution of the present invention, there are multiple stirring blades 301 in the stirring mechanism 3, and the end of each stirring blade 301 near the air supply pipe 201 is rotatably connected to the air supply pipe 201. The multiple stirring blades 301 are parallel to each other and are equidistantly distributed in the vertical direction. The stirring mechanism 3 also includes a pull rod 302 and a connecting rod 303. The two ends of the pull rod 302 are respectively connected to the can cover 101 and the stirring blades 301 near the can cover 101 through ball joints. The connecting rod 303 is arranged parallel to the air supply pipe 201 and is rotatably connected to each stirring blade 301.

[0028] As the exhaust pipe 204 drives the cylindrical block 203 to rotate continuously in both directions, the air supply pipe 201 also rotates synchronously. The air supply pipe 201 drives the stirring blades 301 to rotate continuously around the air supply pipe 201. During this process, since the stirring blades 301 are adjacent to each other through the connecting rod 303 and form a parallelogram structure with the air supply pipe 201, and the top stirring blades 301 are connected to the can lid 101 through the pull rod 302, the connection point between the pull rod 302 and the stirring blades 301 changes continuously, while the connection point between the pull rod 302 and the can lid 101 does not change, and the length of the pull rod 302 does not change. The pull rod 302 will simultaneously pull the stirring blades 301 to tilt upwards, thereby increasing the stirring range of the stirring blades 301 and effectively improving the uniformity of the mixing between air and lactic acid bacteria liquid.

[0029] As a preferred embodiment of the present invention, a heater 8 for heating the gas passing through the conduit is provided in the middle of the conduit.

[0030] The heater 8 can heat the air passing through the conduit, thereby increasing the air temperature injected into the lactic acid bacteria solution and maintaining the temperature of the lactic acid bacteria solution within a suitable range.

[0031] As a preferred technical solution of the present invention, the top and bottom of the mounting groove 401 are provided with sliding grooves 9, and springs 10 and spherical blocks 11 are installed inside the sliding grooves 9. The spherical blocks 11 are slidably connected to the sliding grooves 9, and the spherical blocks 11 are located near the opening of the sliding grooves 9. The ends of the two poles of the first magnet 404 are provided with limiting grooves 12, and the limiting grooves 12 correspond to the positions of the spherical blocks 11.

[0032] During the rotation of gear 403 between the two arc-shaped racks 406, the spherical block 11 is embedded in the limiting groove 12 under the action of spring 10, which can keep the magnet stable. At the same time, when gear 403 meshes with arc-shaped racks 406, the spherical block 11 can be easily squeezed into the slide groove 9 by the groove wall of the limiting groove 12.

[0033] Specific working principle: At the start of fermentation, the lactic acid bacteria liquid is added into the fermentation tank 1 through the feed inlet 102. After fermentation is completed, it is discharged from the discharge outlet 104. During this process, the fermentation speed of the lactic acid bacteria is increased by the gas supply mechanism 2 and the stirring mechanism 3, and the excess gas in the fermentation tank 1 is discharged through the exhaust valve 103.

[0034] The gas discharge is controlled by the reversing mechanism 4. Since the first magnet 404 is located between the two second magnets 407, and the magnetic poles of the two second magnets 407 are the same on opposite sides, one end of the first magnet 404 attracts the opposite pole of one of the second magnets 407, and the other end repels the like pole of the other second magnet 407. This causes the first magnet 404 to drive the slide tube 208 to remain at the top / bottom of the cylindrical groove 205, thereby sealing the vent 207 at the top / bottom of the hollow tube 206. After that, air can only enter the cylindrical groove 205 from the bottom / top of the hollow tube 206. The air enters from the cylindrical groove 205 and flows into a set of exhaust pipes 204 that connect to the cylindrical block 203 from the bottom / top. It then exits from the outlet 210 at the bottom of the same set of exhaust pipes 204. During the air expulsion process, the reaction force causes the exhaust pipes 204 to rotate the cylindrical block 203 relative to the slide tube 208 until the gear 403 meshes with the arc-shaped rack 406 at a higher / lower position. Afterward, the cylindrical block 203 continues to rotate, and under the action of the arc-shaped rack 406, the gear 403 rotates along with the cylindrical block 203. The gear 403 drives the first gear fixedly connected to it... As the first magnet 404 rotates and flips, the limiting plate 7 restricts the gear 403 from moving downwards or upwards, thus keeping the gear 403 engaged with the arc-shaped rack 406. This continues until the first magnet 404 flips 180 degrees, at which point the gear 403 separates from the arc-shaped rack 406 and leaves the area of ​​the limiting plate 7. Because the magnetic poles of the first magnet 404 are reversed after the 180-degree flip, the second magnet 407, which was previously repelled by it, will attract it, while the previously attracted magnets will repel it. This causes the first magnet 404 to move the slide tube 208. The cylinder moves downwards / upwards, thereby sealing the vent 207 at the bottom / top of the hollow tube 206, allowing air to be discharged from the outlet 210 at the bottom of another set of exhaust pipes 204. This causes the cylindrical block 203 to begin to reverse until the gear 403 meshes with the arc-shaped rack 406 at a lower / higher position. The rotation process of the first magnet 404 is then repeated, creating a continuous cycle that causes the exhaust pipe 204 to perform forward and reverse rotations. During this rotation, the position of the air discharged from the lactic acid bacteria liquid is continuously changed, thereby further improving the uniformity of air dispersion within the lactic acid bacteria liquid.

[0035] As the exhaust pipe 204 drives the cylindrical block 203 to rotate continuously in both directions, the air supply pipe 201 also rotates synchronously. The air supply pipe 201 drives the stirring blades 301 to rotate continuously around the air supply pipe 201. During this process, since the stirring blades 301 are adjacent to each other through the connecting rod 303 and form a parallelogram structure with the air supply pipe 201, and the top stirring blades 301 are connected to the can lid 101 through the pull rod 302, the connection point between the pull rod 302 and the stirring blades 301 changes continuously, while the connection point between the pull rod 302 and the can lid 101 does not change, and the length of the pull rod 302 does not change. The pull rod 302 will simultaneously pull the stirring blades 301 to tilt upwards, thereby increasing the stirring range of the stirring blades 301 and effectively improving the uniformity of the mixing between air and lactic acid bacteria liquid.

[0036] The embodiments of the present invention are given for the purposes of illustration and description. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A lactic acid bacteria fermentation apparatus for preparing extracellular polysaccharides, comprising a fermenter (1), wherein the fermenter (1) is provided with a lid (101) at the top, the lid (101) is provided with a feed inlet (102) and an exhaust valve (103) at the top, and the fermenter (1) is provided with a discharge outlet (104) at the bottom, characterized in that: It also includes a gas supply mechanism (2) and a stirring mechanism (3); The gas supply mechanism (2) includes a gas supply pipe (201) installed through the center of the can lid (101) and a gas pump (202) installed on the top of the can lid (101). The gas pump (202) is connected to the top of the gas supply pipe (201) via a conduit. A cylindrical block (203) is fixedly connected to the bottom end of the gas supply pipe (201). An exhaust pipe (204) is connected to the outside of the cylindrical block (203). A cylindrical groove (205) is opened inside the cylindrical block (203). A hollow tube (206) is installed in the center of the cylindrical groove (205). The core tube (206) is connected to the exhaust pipe (204). The top end of the hollow tube (206) is rotatably connected to the cylindrical block (203), and the bottom end passes through the cylindrical block (203) and is fixedly connected to the bottom of the fermentation tank (1). Ventilation holes (207) are provided at the top and bottom of the part of the hollow tube (206) located inside the cylindrical groove (205). A sliding tube (208) is slidably sleeved on the outside of the hollow tube (206). Sealing plates (209) are provided at the top and bottom of the sliding tube (208). A reversing mechanism (4) is also provided inside the cylindrical groove (205). The stirring mechanism (3) includes stirring blades (301) disposed outside the air supply pipe (201).

2. The lactic acid bacteria fermentation apparatus for preparing extracellular polysaccharides as described in claim 1, characterized in that: There are two sets of exhaust pipes (204), and the two sets of exhaust pipes (204) are arranged in a staggered circular pattern around the cylindrical block (203). The two sets of air supply pipes (201) are connected to the cylindrical groove (205) from the top and bottom of the cylindrical block (203) respectively. The bottom of each air supply pipe (201) is provided with an air outlet (210) at an angle, and the air outlets (210) provided on the two sets of air supply pipes (201) are in opposite directions.

3. The lactic acid bacteria fermentation apparatus for preparing extracellular polysaccharides as described in claim 1, characterized in that: The reversing mechanism (4) includes an installation groove (401) opened on the outer wall of the slide tube (208). A fixed shaft (402) is fixedly installed at the center of the installation groove (401). A gear (403) is rotatably installed on the outer side of the fixed shaft (402) away from the inner wall of the installation groove (401). A first magnet (404) is fitted on the surface of the fixed shaft (402) inside the installation groove (401). The gear (403) and the first magnet (404) are fixedly connected by a connecting plate (405). The reversing mechanism (4) also includes an arc-shaped rack (406) provided on the side wall of the cylindrical groove (205). There are two arc-shaped racks (406). The projection positions of the two arc-shaped racks (406) on the horizontal plane and their heights in the vertical direction are staggered. Both arc-shaped racks (406) can mesh with the gear (403).

4. The lactic acid bacteria fermentation apparatus for preparing extracellular polysaccharides as described in claim 3, characterized in that: The reversing mechanism (4) also includes two second magnets (407) respectively embedded in the top and bottom of the cylindrical groove (205), and the magnetic poles on opposite sides of the two second magnets (407) are the same.

5. The lactic acid bacteria fermentation apparatus for preparing extracellular polysaccharides as described in claim 3, characterized in that: A fixing rod (5) is provided at the top of the fixed shaft (402) between the first magnet (404) and the gear (403). An arc plate (6) is fixedly connected to the top of the fixing rod (5) around the gear (403). A limit plate (7) is provided on the side wall of the cylindrical groove (205) at a position close to the top of each first magnet (404).

6. The lactic acid bacteria fermentation apparatus for preparing extracellular polysaccharides as described in claim 1, characterized in that: The stirring mechanism (3) has multiple stirring blades (301), and the end of each stirring blade (301) near the air supply pipe (201) is rotatably connected to the air supply pipe (201). The multiple stirring blades (301) are parallel to each other and are equidistantly distributed in the vertical direction. The stirring mechanism (3) also includes a pull rod (302) and a connecting rod (303). The two ends of the pull rod (302) are respectively connected to the can lid (101) and the stirring blades (301) near the can lid (101) through ball joints. The connecting rod (303) is arranged parallel to the air supply pipe (201) and is rotatably connected to each of the stirring blades (301).

7. The lactic acid bacteria fermentation apparatus for preparing extracellular polysaccharides as described in claim 1, characterized in that: A heater (8) for heating the gas passing through the conduit is provided in the middle of the conduit.

8. The lactic acid bacteria fermentation apparatus for preparing extracellular polysaccharides as described in claim 3, characterized in that: The top and bottom of the mounting groove (401) are provided with sliding grooves (9). Springs (10) and spherical blocks (11) are installed inside the sliding grooves (9). The spherical blocks (11) are slidably connected to the sliding grooves (9) and are located near the opening of the sliding grooves (9). The ends of the two poles of the first magnet (404) are provided with limiting grooves (12), and the limiting grooves (12) correspond to the positions of the spherical blocks (11).

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