Fermentation tank for preparation of N-acetylglucosamine

Abstract

The present invention relates to the technical field of fermentation equipment, and in particular to a fermentation tank for preparing N-acetylglucosamine, comprising a fermentation tank body and a separation mechanism arranged at the center of the fermentation tank body; the separation mechanism comprises a circulation cylinder fixed at the bottom end of the inner side of the fermentation tank body and a circulation motor installed at the bottom end of the outer side of the fermentation tank body, and a plurality of liquid outlets and liquid inlets are respectively provided at the upper and lower ends of the circulation cylinder. The present invention uses the separation mechanism to allow the fermentation liquid to continuously circulate at the upper and lower ends of the inner side of the fermentation tank body, so that the fermentation liquid at each position inside the fermentation tank body can flow through the inner side of the circulation cylinder. After the fermentation liquid flows through the inner side of the circulation cylinder, the suspended or precipitated impurities in the fermentation liquid are separated and collected to ensure the cleanliness of the fermentation liquid inside the fermentation tank body, thereby improving the production efficiency of yeast and the preparation purity of N-acetylglucosamine.

Description

Technical Field

[0001] The invention relates to the technical field of fermentation equipment, in particular to a fermentation tank for preparing N-acetylglucosamine. Background Art

[0002] N-acetylglucosamine is a white powder at room temperature and pressure. It is mainly found in breast milk and bovine colostrum, and a small amount is distributed in the skin, joint cartilage, and intestinal mucus. It is a component of hyaluronic acid. N-acetylglucosamine can be prepared by a green, environmentally friendly and low-cost fermentation method. During the preparation process, a well-sealed fermentation tank is required.

[0003] After searching, a Chinese patent with publication number: CN116478809A discloses a fermentation tank, including a tank body with an opening at the upper end, a sealing cover is detachably connected to the upper end of the tank body, a rotating port is provided in the middle of the sealing cover, a rotating disk is rotatably connected to the rotating port, an arc groove is provided at the upper end of the rotating disk, an arc retaining bar is provided inside the arc groove, and an arc-shaped rack is provided on the inner wall of the arc groove; an annular protective shell covering the arc groove is provided at the upper end of the sealing cover, a bar slide is provided at the upper end of the annular protective shell, a driving motor is slidably connected to the bar slide, and a driving gear meshed with the arc-shaped rack is connected to the power output shaft of the driving motor; a hollow spiral agitator is connected to the lower end of the rotating disk, an inverted L-shaped mounting frame is provided at the upper end of the annular protective shell, and a liquid inlet connecting pipe and a liquid outlet connecting pipe for connecting to the head and tail ends of the hollow spiral agitator are provided through the inverted L-shaped mounting frame.

[0004] Based on the above search and combined with actual problems, it was found that: when N-acetylglucosamine is prepared, impurities such as polysaccharides and proteins will be produced in the fermentation broth. These impurities will continue to aggregate into larger-sized agglomerates. These impurities will not only affect the preparation purity of N-acetylglucosamine, but also inhibit the enzyme activity during the fermentation process, thereby reducing the output efficiency of N-acetylglucosamine. Summary of the invention

[0005] The object of the present invention is to provide a fermentation tank for preparing N-acetylglucosamine to solve the problems raised in the above background technology.

[0006] The technical scheme of the present invention is: a fermentation tank for preparing N-acetylglucosamine comprises a fermentation tank body and a separation mechanism arranged at the center of the fermentation tank body.

[0007] The separation mechanism comprises a circulation drum fixed at the bottom of the inner side of the fermentation tank body and a circulation motor installed at the bottom of the outer side of the fermentation tank body. The upper and lower ends of the circulation drum are respectively provided with a plurality of liquid outlets and liquid inlets, and a plurality of blocking rings are arranged at equal intervals at the middle section of the inner side of the circulation drum, and a blocking surface is arranged at the lower side of the inner side of each blocking ring;

[0008] A rotating shaft extending into the interior of the circulating drum is fixed to the driving end of the circulating motor, a plurality of centrifugal plates arranged in a circle are fixed to the outer side of the rotating shaft at the middle position, and a second spiral blade and a first spiral blade are fixed to the outer side of the rotating shaft. The second spiral blade and the first spiral blade are respectively located at the upper and lower ends of the rotating shaft, and a liquid surface cleaning mechanism is also provided at the upper end of the circulating drum.

[0009] Furthermore, a plurality of suspended matter collecting rings arranged alternately with the blocking rings are arranged on the inner side of the circulation cylinder, a plurality of accommodating cavities are arranged inside each suspended matter collecting ring, and each suspended matter collecting ring is made of sponge material.

[0010] Furthermore, the liquid surface cleaning mechanism includes a cover shell fixed to the upper end of the circulation cylinder, an extension shaft is rotatably inserted into the upper end of the cover shell, a reduction transmission mechanism is arranged between the extension shaft and the rotating shaft, and a collar is sleeved on the outer side of the extension shaft;

[0011] Two suspended matter collecting mechanisms arranged in a circle are arranged on both sides of the collar. The suspended matter collecting mechanism includes a suspension block fixed on one side of the collar. A transposition motor is installed at one end of the suspension block, and a first roller, a second roller and a third roller are rotatably connected at the middle position of the suspension block. An adhesive belt is provided on the outer rotating sleeves of the first roller, the second roller and the third roller, and a driving end of the transposition motor is fixedly connected to the end of the third roller.

[0012] Furthermore, a plurality of baffles are evenly fixed on the outer side of the adhesive belt.

[0013] Furthermore, the collar is slidably connected to the outer side of the extended shaft, and a buoyancy cylinder is provided on the lower side of each suspension block.

[0014] Furthermore, the upper surface of each suspension block is inclined, and the cross-sectional shape of the adhesive belt is the same as the cross-sectional shape of the suspension block.

[0015] Furthermore, the reduction transmission mechanism includes a first driving gear fixed to the upper end of the rotating shaft, a second driven gear fixed to the lower end of the extended rotating shaft, and an intermediate shaft rotatably connected to the inner side of the cover shell, and the second driving gear and the first driven gear are respectively fixed to the outer ends of the intermediate shaft, the second driving gear is meshed with the second driven gear, and the first driven gear is meshed with the first driving gear, the number of teeth of the first driving gear is smaller than that of the first driven gear, and the number of teeth of the second driving gear is smaller than that of the second driven gear.

[0016] Furthermore, two rotating horizontal plates are fixed on both sides of the ring, one end of the two rotating horizontal plates is fixed with a fixed column, the lower ends of the two fixed columns are fixed with a gathering plate, the two gathering plates are both arc-shaped structures, and the two gathering plates are arranged in a circle, and the two rotating horizontal plates and the two suspended blocks are staggered.

[0017] Furthermore, a stirring motor is installed at the upper end of the outer side of the fermentation tank body, and a plurality of stirring brackets located inside the fermentation tank body are fixed outside the driving end of the stirring motor, and a stirring rod is fixed at the lower end of each stirring bracket.

[0018] Compared with the prior art, the present invention has the following improvements and advantages:

[0019] (1) The separation mechanism allows the fermentation liquid to circulate continuously at the upper and lower ends of the inner side of the fermentation tank body, so that the fermentation liquid at all positions in the fermentation tank body can flow through the inner side of the circulation cylinder. After the fermentation liquid flows through the inner side of the circulation cylinder, the suspended or precipitated impurities in the fermentation liquid are separated and collected to ensure the cleanliness of the fermentation liquid inside the fermentation tank body, thereby improving the production efficiency of yeast and the preparation purity of N-acetylglucosamine.

[0020] (2) Impurities with low density floating on the surface of the fermentation liquid are collected through the reduction transmission mechanism and the liquid surface cleaning mechanism, so as to maintain the cleanliness of the fermentation liquid surface, further improving the production purity of N-acetylglucosamine. In addition, it can also prevent the impurities on the liquid surface from blocking oxygen from dissolving into the fermentation liquid, thereby ensuring that the microorganisms in the fermentation liquid can produce N-acetylglucosamine more efficiently, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the internal structure of the fermentation tank;

[0024] Figure 3 It is a first cross-sectional structural schematic diagram of the present invention;

[0025] Figure 4 for Figure 3 A schematic diagram of the enlarged structure at A in the middle;

[0026] Figure 5 for Figure 3 A schematic diagram of the enlarged structure at B in the middle;

[0027] Figure 6 It is a schematic diagram of the cross-sectional structure of the suspended matter collection ring;

[0028] Figure 7 It is a second cross-sectional structural schematic diagram of the present invention;

[0029] Figure 8 for Figure 7 Schematic diagram of the enlarged structure at point C in the middle.

[0030] Reference numerals:

[0031] 1. Fermentation tank; 2. Stirring motor; 3. Stirring bracket; 4. Stirring rod; 101. Circulation cylinder; 102. Liquid inlet; 103. Liquid outlet; 104. Circulation motor; 105. Rotation shaft; 106. First spiral blade; 107. Second spiral blade; 108. Centrifugal plate; 109. Blocking ring; 110. Blocking surface; 111. Suspended matter collection ring; 112. Accommodating chamber; 201. Cover; 202. Extended rotating shaft; 20 3. Ring; 204. Suspension block; 205. Transposition motor; 206. First roller; 207. Second roller; 208. Third roller; 209. Adhesion belt; 210. Baffle bar; 211. Buoyancy cylinder; 212. Second driven gear; 213. First driving gear; 214. Intermediate shaft; 215. Second driving gear; 216. First driven gear; 217. Rotating horizontal plate; 218. Fixed column; 219. Gathering plate. DETAILED DESCRIPTION

[0032] The present invention is described in detail below, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] The present invention provides a fermentation tank for preparing N-acetylglucosamine by improvement. The technical scheme of the present invention is:

[0034] like Figures 1 to 8 As shown, an embodiment of the present invention provides a fermentation tank for preparing N-acetylglucosamine, including a fermentation tank body 1, and also includes a separation mechanism arranged at the center of the fermentation tank body 1. The separation mechanism includes a circulation cylinder 101 fixed to the bottom end of the inner side of the fermentation tank body 1 and a circulation motor 104 installed at the bottom end of the outer side of the fermentation tank body 1, and the upper and lower ends of the circulation cylinder 101 are respectively provided with a plurality of liquid outlets 103 and liquid inlets 102, and the inner side of the circulation cylinder 101 is located at the middle section. A plurality of blocking rings 109 are evenly spaced and arranged, and each blocking ring 109 is provided with a blocking surface 110 at the lower side position.

[0035] A rotating shaft 105 extending into the interior of the circulating drum 101 is fixed to the driving end of the circulating motor 104, a plurality of centrifugal plates 108 arranged in a circle are fixed to the outer side of the rotating shaft 105 at the middle position, and a second spiral blade 107 and a first spiral blade 106 are fixed to the outer side of the rotating shaft 105, the second spiral blade 107 and the first spiral blade 106 are respectively located at the upper and lower ends of the rotating shaft 105, and a liquid surface cleaning mechanism is also provided at the upper end of the circulating drum 101.

[0036] Furthermore, a plurality of suspended matter collecting rings 111 arranged alternately with the blocking rings 109 are arranged on the inner side of the circulation cylinder 101, a plurality of accommodating cavities 112 are arranged inside each suspended matter collecting ring 111, and each suspended matter collecting ring 111 is made of sponge material.

[0037] Impurities with smaller particles will penetrate into the pores of the sponge material of the suspended matter collection ring 111, and impurities with larger particles will enter the accommodating chamber 112, thereby collecting the separated impurities and preventing the impurities from circulating into the fermentation tank body 1 again, thereby ensuring the cleanliness of the fermentation liquid inside the fermentation tank body 1.

[0038] Further, the liquid surface cleaning mechanism includes a cover 201 fixed to the upper end of the circulation drum 101, and an extension shaft 202 is rotatably inserted at the upper end of the cover 201, and a reduction transmission mechanism is arranged between the extension shaft 202 and the rotating shaft 105. A collar 203 is sleeved on the outer side of the extension shaft 202, and two suspended matter collecting mechanisms arranged in a circumference are arranged on both sides of the collar 203. The suspended matter collecting mechanism includes a suspension block 204 fixed to one side of the collar 203, a transposition motor 205 is installed at one end of the suspension block 204, and a first roller 206, a second roller 207 and a third roller 208 are rotatably connected at the middle section of the suspension block 204, and an adhesive belt 209 is rotatably sleeved on the outer sides of the first roller 206, the second roller 207 and the third roller 208, and the driving end of the transposition motor 205 is fixedly connected to the end of the third roller 208.

[0039] The liquid surface cleaning mechanism can collect impurities with low density floating on the fermentation liquid surface, maintain the cleanliness of the fermentation liquid surface, and further improve the production purity of N-acetylglucosamine. In addition, it can also prevent impurities on the liquid surface from blocking oxygen from dissolving into the fermentation liquid, thereby ensuring that the microorganisms in the fermentation liquid can produce N-acetylglucosamine more efficiently, thereby improving production efficiency.

[0040] Furthermore, a plurality of blocking strips 210 are evenly fixed on the outer side of the adhesive belt 209 .

[0041] The blocking of the blocking bar 210 can prevent the impurities adhering to the outer side of the adhesion belt 209 from sliding back to the surface of the fermentation liquid, thereby achieving the cleaning of the impurities at the liquid surface.

[0042] Furthermore, the collar 203 is slidably connected to the outer side of the extended shaft 202 , and a buoyancy tube 211 is provided on the lower side of each suspension block 204 .

[0043] As the fermentation liquid level rises and falls, the buoyancy cylinder 211 can keep the lower side of the suspension block 204 of the suspended matter collecting mechanism just in contact with the fermentation liquid surface, thereby ensuring that the impurities floating on the fermentation liquid surface are fully collected.

[0044] Furthermore, the upper surface of each suspension block 204 is inclined, and the cross-sectional shape of the adhesive belt 209 is the same as the cross-sectional shape of the suspension block 204 .

[0045] The upper surfaces of the suspension blocks 204 are inclined at an angle so as to scoop up the impurities floating on the surface of the fermentation liquid without affecting the normal flow of the fermentation liquid, thereby achieving the collection of the floating impurities.

[0046] Furthermore, the reduction transmission mechanism includes a first driving gear 213 fixed to the upper end of the rotating shaft 105, a second driven gear 212 fixed to the lower end of the extended rotating shaft 202, and an intermediate shaft 214 rotatably connected to the inner side of the cover shell 201, and a second driving gear 215 and a first driven gear 216 are respectively fixed to the outer ends of the intermediate shaft 214, the second driving gear 215 is meshed with the second driven gear 212, and the first driven gear 216 is meshed with the first driving gear 213, the number of teeth of the first driving gear 213 is smaller than that of the first driven gear 216, and the number of teeth of the second driving gear 215 is smaller than that of the second driven gear 212.

[0047] The extended shaft 202 of the liquid cleaning mechanism is driven to rotate smoothly at a slower speed through the reduction transmission mechanism, thereby driving the two suspended matter collecting mechanisms to move slowly along the fermentation liquid surface to prevent the floating impurities on the liquid surface from being dispersed due to excessive speed, thereby affecting the impurity collection.

[0048] Furthermore, two rotating horizontal plates 217 are fixed on both sides of the ring 203, and a fixed column 218 is fixed at one end of the two rotating horizontal plates 217. A gathering plate 219 is fixed at the lower end of the two fixed columns 218. The two gathering plates 219 are both arc-shaped structures, and the two gathering plates 219 are arranged in a circle. The two rotating horizontal plates 217 and the two suspended blocks 204 are staggered.

[0049] When the extended rotating shaft 202 and the sleeve ring 203 rotate, the two rotating horizontal plates 217 can be driven to rotate accordingly, thereby driving two circumferentially arranged gathering plates 219 to rotate accordingly. Moreover, the gathering plates 219 are in an arc-shaped structure. Therefore, when the gathering plates 219 move along the liquid surface, the impurities at the edge can be gathered to the center, thereby facilitating the suspended matter collection mechanism to collect and clean the impurities more efficiently.

[0050] Furthermore, a stirring motor 2 is installed at the upper end of the outer side of the fermentation tank body 1, and a plurality of stirring brackets 3 located inside the fermentation tank body 1 are fixed to the outer side of the driving end of the stirring motor 2, and a stirring rod 4 is fixed to the lower end of each stirring bracket 3.

[0051] The stirring motor 2 drives the multiple stirring brackets 3 at the driving end to rotate, and the multiple stirring brackets 3 drive the multiple stirring rods 4 to rotate, stirring the fermentation liquid inside the fermentation tank body 1, so that the yeast and other raw materials are fully mixed to produce the required N-acetylglucosamine.

[0052] Working principle: When in use, raw materials for preparing N-acetylglucosamine, such as glucose, acetic anhydride, yeast, etc. are put into the fermentation tank body 1, and the stirring motor 2 is driven to rotate multiple stirring brackets 3 at the driving end, and the multiple stirring brackets 3 drive multiple stirring rods 4 to rotate, so as to stir the fermentation liquid inside the fermentation tank body 1, so that the yeast and other raw materials are fully mixed to produce the required N-acetylglucosamine.

[0053] During fermentation, useless impurities such as polysaccharides and proteins will be produced in the fermentation liquid. These impurities tend to aggregate into agglomerated impurities in the fermentation liquid. Impurities with high density will be suspended or precipitated inside the fermentation liquid, while impurities with low density will float on the surface of the fermentation liquid, which will not only affect the purity of the preparation of N-acetylglucosamine, but also affect the normal growth of related yeasts and the process of producing N-acetylglucosamine, thereby affecting the preparation efficiency of N-acetylglucosamine.

[0054] The circulation motor 104 controlling the separation mechanism drives the rotating shaft 105 to rotate, and the rotating shaft 105 drives the first spiral blade 106 and the second spiral blade 107 at both ends thereof to rotate. The first spiral blade 106 rotates to suck the fermentation liquid at the bottom of the fermentation tank body 1 into the inner bottom of the circulation barrel 101 through multiple liquid inlets 102. With the continuous rotation of the first spiral blade 106, the fermentation liquid inside the circulation barrel 101 can be transported to flow continuously to the upper end. At the same time, the second spiral blade 107 rotates to transport the fermentation liquid inside the circulation barrel 101 to the upper part of the fermentation tank body 1 through the liquid outlet 103, so that the fermentation liquid continuously circulates at the upper and lower ends of the inner side of the fermentation tank body 1. At the same time, with the stirring and coordination of multiple stirring rods 4, the fermentation liquid at each position inside the fermentation tank body 1 can flow through the inner side of the circulation barrel 101. The rotating shaft 105 rotates while driving the multiple centrifugal plates 108 on the outside thereof to rotate. The multiple centrifugal plates 108 drive the fermentation liquid flowing through the inner side of the circulation barrel 101 to rotate at high speed. The impurities with higher density suspended in the fermentation liquid or precipitated at the bottom rotate with the fermentation liquid at high speed, so the impurities will gather at the inner side wall of the circulation barrel 101, thereby achieving the separation of impurities and fermentation liquid. Since the inner side of the circulation barrel 101 is provided with multiple blocking rings 109 at equal intervals at the middle position, and the inner side of each blocking ring 109 is provided with a blocking surface 110 at the lower side position, the blocking surface 110 will block the lumped impurities from continuing to flow to the upper end of the circulation barrel 101 with the fermentation liquid, and under the blocking effect of the blocking surface 110, these lumped impurities will be attached to the inner side of each suspended matter collection ring 111. Since a plurality of accommodating cavities 112 are provided inside each suspended matter collecting ring 111, and each suspended matter collecting ring 111 is made of sponge material, impurities with smaller particles will penetrate into the pores of the sponge material of the suspended matter collecting ring 111, and impurities with larger particles will enter the accommodating cavity 112, thereby collecting the separated impurities and preventing the impurities from circulating into the fermentation tank body 1 again, thereby ensuring the cleanliness of the fermentation liquid inside the fermentation tank body 1, thereby improving the production efficiency of yeast and the preparation purity of N-acetylglucosamine.

[0055] The rotation of the rotating shaft 105 drives the first driving gear 213 of the reduction transmission mechanism to rotate, and the first driving gear 213 drives the first driven gear 216 to rotate through the meshing of teeth, and the first driven gear 216 drives the second driving gear 215 to rotate through the intermediate shaft 214, and the second driving gear 215 drives the second driven gear 212 to rotate, thereby driving the extension shaft 202 of the liquid surface cleaning mechanism to rotate. Since the number of teeth of the first driving gear 213 is less than that of the first driven gear 216, and the number of teeth of the second driving gear 215 is less than that of the second driven gear 212, the rotation speed of the extension shaft 202 is less than that of the rotating shaft 105, thereby ensuring that the extension shaft 202 of the liquid surface cleaning mechanism rotates smoothly at a slower speed. Since the sleeve ring 203 is slidably connected with the outer side of the extension shaft 202, a buoyancy cylinder 211 is provided on the lower side of each suspension block 204, and the buoyancy cylinder 211 can float on the liquid surface of the fermentation liquid. The buoyancy cylinder 211 can keep the lower side of the suspension block 204 of the suspension collection mechanism just in contact with the liquid surface of the fermentation liquid. The extension shaft 202 drives the two suspension collection mechanisms to rotate, and the rotation direction is consistent with the inclination direction of the upper surface of the suspension block 204. Therefore, when the suspension block 204 and the adhesion belt 209 of the suspension collection mechanism move along the liquid surface, the impurities floating on the liquid surface can be adhered to the outer side of the adhesion belt 209, and at the same time, the impurities adhered to the outer side of the adhesion belt 209 can be prevented from sliding back to the liquid surface of the fermentation liquid through the blocking of the baffle 210, thereby realizing the cleaning of the impurities on the liquid surface. To further ensure the purity of N-acetylglucosamine preparation, the transposition motor 205 can intermittently rotate at a smaller angle, driving the third roller 208 to rotate at the same angle. The third roller 208 drives the adhesion belt 209 to rotate at a certain angle, and the impurities located on the outside of the adhesion belt 209 near the first roller 206 can be moved to the high place where the third roller 208 is located following the rotation of the adhesion belt 209, so that the impurities are evenly adhered to the outside of the adhesion belt 209, more impurities can be collected, and the cleanliness of the fermentation liquid surface is ensured.

[0056] When the extended shaft 202 and the collar 203 of the liquid surface cleaning mechanism rotate, the two rotating horizontal plates 217 can be driven to rotate accordingly, thereby driving two circularly arranged gathering plates 219 to rotate accordingly. Moreover, the gathering plates 219 are in an arc-shaped structure. Therefore, when the gathering plates 219 move along the liquid surface, the impurities at the edge can be gathered to the center, thereby facilitating the suspended matter collection mechanism to collect and clean the impurities more efficiently.

[0057] The above description 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 may 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 the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fermentation tank for preparing N-acetylglucosamine, comprising a fermentation tank body (1), characterized in that: It also includes a separation mechanism arranged at the center of the fermentation tank body (1); The separation mechanism comprises a circulation cylinder (101) fixed to the inner bottom end of the fermentation tank body (1) and a circulation motor (104) installed at the outer bottom end of the fermentation tank body (1); the circulation cylinder (101) is provided with a plurality of liquid outlets (103) and liquid inlets (102) at upper and lower ends thereof, respectively; a plurality of blocking rings (109) are provided at equal intervals at the middle section of the inner side of the circulation cylinder (101); and a blocking surface (110) is provided at the inner side of each blocking ring (109) at the lower side edge thereof; A rotating shaft (105) extending into the interior of the circulating drum (101) is fixed to the driving end of the circulating motor (104); a plurality of centrifugal plates (108) arranged in a circumferential pattern are fixed to the outside of the rotating shaft (105) at a middle position; a second spiral blade (107) and a first spiral blade (106) are fixed to the outside of the rotating shaft (105); the second spiral blade (107) and the first spiral blade (106) are respectively located at the upper and lower ends of the rotating shaft (105); and a liquid surface cleaning mechanism is also provided at the upper end of the circulating drum (101); A plurality of suspended matter collecting rings (111) arranged in an alternating manner with the blocking rings (109) are arranged on the inner side of the circulation cylinder (101), a plurality of accommodating cavities (112) are arranged inside each of the suspended matter collecting rings (111), and each of the suspended matter collecting rings (111) is made of a sponge material; The liquid surface cleaning mechanism comprises a cover shell (201) fixed to the upper end of the circulation cylinder (101); an extension shaft (202) is rotatably inserted into the upper end of the cover shell (201); a reduction transmission mechanism is provided between the extension shaft (202) and the rotating shaft (105); and a collar (203) is sleeved on the outer side of the extension shaft (202); Two suspended matter collecting mechanisms arranged in a circumference are provided on both sides of the collar (203), the suspended matter collecting mechanism comprising a suspension block (204) fixed to one side of the collar (203), a transposition motor (205) being installed at one end of the suspension block (204), and a first rotating roller (206), a second rotating roller (207) and a third rotating roller (208) being rotatably connected at the middle section of the suspension block (204), an adhesive belt (209) being rotatably sleeved on the outer sides of the first rotating roller (206), the second rotating roller (207) and the third rotating roller (208), and a driving end of the transposition motor (205) being fixedly connected to an end of the third rotating roller (208); Two rotating transverse plates (217) are fixed on both sides of the collar (203); a fixing column (218) is fixed at one end of the two rotating transverse plates (217); a gathering plate (219) is fixed at the lower end of the two fixing columns (218); the two gathering plates (219) are both in an arc-shaped structure, and the two gathering plates (219) are arranged in a circle, and the two rotating transverse plates (217) and the two suspension blocks (204) are arranged in a staggered manner; The reduction transmission mechanism comprises a first driving gear (213) fixed to the upper end of the rotating shaft (105), a second driven gear (212) fixed to the lower end of the extending rotating shaft (202), and an intermediate shaft (214) rotatably connected to the inner side of the housing (201); a second driving gear (215) and a first driven gear (216) are respectively fixed to the outer ends of the intermediate shaft (214); the second driving gear (215) meshes with the second driven gear (212); the first driven gear (216) meshes with the first driving gear (213); the number of teeth of the first driving gear (213) is smaller than that of the first driven gear (216); and the number of teeth of the second driving gear (215) is smaller than that of the second driven gear (212).

2. The fermentation tank for preparing N-acetylglucosamine according to claim 1, characterized in that: A plurality of blocking strips (210) are evenly fixed on the outer side of the adhesive belt (209).

3. The fermentation tank for preparing N-acetylglucosamine according to claim 1, characterized in that: The collar (203) is slidably connected to the outer side of the extension shaft (202), and a buoyancy cylinder (211) is provided on the lower side of each suspension block (204).

4. The fermentation tank for preparing N-acetylglucosamine according to claim 1, characterized in that: The upper surface of each suspension block (204) is inclined, and the cross-sectional shape of the adhesive belt (209) is the same as the cross-sectional shape of the suspension block (204).

5. The fermentation tank for preparing N-acetylglucosamine according to claim 1, characterized in that: A stirring motor (2) is installed at the upper end of the outer side of the fermentation tank body (1); a plurality of stirring brackets (3) located inside the fermentation tank body (1) are fixed to the outer side of the driving end of the stirring motor (2); and a stirring rod (4) is fixed to the lower end of each stirring bracket (3).

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