Dextran preparation device

Abstract

A stirring paddle is provided with a first driven gear, a shoveling and scraping paddle is provided with a second driven gear, a transmission shaft is provided with a first transmission gear and a second transmission gear, a motor output shaft is provided with a driving gear, and a position adjusting rod drives the transmission shaft to move. The second transmission gear is alternately meshed with the first driven gear and the second driven gear, and the first transmission gear is kept meshed with the driving gear. Compared with the prior art, the shoveling and scraping paddle does not need to be disassembled and assembled, and can be directly called when the reaction tank needs to be cleaned; and by directly operating the position adjusting rod, the matching of the motor between the stirring process and the cleaning process can be completed, and the operation is simple.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of chemical equipment especially relates to a dextran preparation device. BACKGROUND

[0002] Dextran, also called glucan or dextrans, is a polymer of glucose, a sticky substance produced by microorganisms similar to starch and dextrin, white or white-like amorphous powder, odorless, tasteless, easily soluble in hot water, insoluble in ethanol, its aqueous solution is colorless or slightly milky clear liquid.

[0003] The preparation method of dextran mainly has direct fermentation method and enzyme synthesis method, and the direct fermentation method is generally used in industrial production. Specifically, the fermentation medium mainly uses sucrose, a small amount of yeast extract and peptone and an appropriate amount of inorganic salts; the equipment is mainly a reaction tank with a stirring paddle, which provides the required site conditions for microbial life activities and metabolism, i.e. the fermentation site.

[0004] In practice, the inner wall of the reaction tank needs to be cleaned regularly, and the utility model patent with publication number CN215560232U discloses a vertical stirring reaction tank convenient to clean, when the reaction tank needs to be cleaned, a long brush is inserted into the stable rod inside the reaction tank, an appropriate amount of cleaning liquid is injected into the reaction tank, the motor is started to drive the long brush to brush and wash the inner wall, and the stable rod is essentially part of the stirring paddle.

[0005] It can be seen that in the structure of the prior art, when cleaning the inner wall of the reaction tank, the reaction tank needs to be opened and the long brush needs to be disassembled each time, which is relatively troublesome to operate. UTILITY MODEL CONTENTS

[0006] The utility model aims at solving at least one of the above-mentioned technical problems, providing a dextran preparation device, reducing the disassembly and assembly work of equipment parts required in the cleaning process, and being convenient to operate.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the technical scheme that:

[0008] The application discloses a dextran preparation device which comprises a reaction tank, a stirring paddle, a scraping paddle, a transmission shaft, a motor, a position adjusting rod and a limiting structure, the stirring paddle is accommodated in the reaction tank, the upper end of the rotating shaft of the stirring paddle is rotationally connected to the top of the reaction tank and is provided with a first driven gear, the scraping paddle comprises a scraper plate suitable for scraping the inner wall of the reaction tank and a rotor connected to the scraper plate, the rotor is rotationally connected to the top of the reaction tank and is provided with a second driven gear, the transmission shaft is rotationally connected to the reaction tank, the two ends of the transmission shaft are respectively provided with a first transmission gear and a second transmission gear, the motor is installed on the top of the reaction tank, the output shaft of the motor is provided with a driving gear, the position adjusting rod is suitable for driving the transmission shaft to move so that the second transmission gear alternately engages with the first driven gear and the second driven gear, the first transmission gear is suitable for keeping engagement with the driving gear when the transmission shaft moves, and the scraping paddle and the stirring paddle are driven by the motor.

[0009] Compared with the prior art, the application has the advantages that the scraping paddle does not need to be disassembled, the scraping paddle can be directly used when the reaction tank needs to be cleaned, the motor can be switched between the stirring process and the cleaning process by directly operating the position adjusting rod, the operation is simple, the stirring and the cleaning share the same power source, the power and the matched structure are saved, and the scraping paddle can simultaneously prevent the peripheral materials from being stirred when the materials are stirred, the materials are prevented from rotating in the same direction, and the mixing effect of the materials is improved.

[0010] As an improvement of the above technical scheme, the scraper plate is a closed frame, the two side edges of the closed frame are suitable for scraping the side walls of the reaction tank, and the top edge and the bottom edge of the closed frame are suitable for scraping the inner top and the inner bottom of the reaction tank respectively.

[0011] As an improvement of the above technical scheme, the top of the reaction tank is provided with a mounting frame, the upper end of the stirring paddle and the transmission shaft are rotationally connected to the mounting frame, and the motor is installed on the mounting frame.

[0012] As an improvement of the above technical scheme, the reaction tank comprises a tank body and a tank cover which is detachably connected to the tank body, and the mounting frame is arranged on the upper end of the tank cover.

[0013] As an improvement of the above technical scheme, the first driven gear and the first thrust bearing are detachably sleeved on the upper end of the stirring paddle, the upper end of the stirring paddle is connected with a first locking nut suitable for locking the first driven gear and the first thrust bearing, and the stirring paddle is supported on the mounting frame through the first thrust bearing.

[0014] As the improvement of the above technical scheme, the rotor and the scraper are integrally formed, the second driven gear and the second thrust bearing are detachable sleeves of the rotor, the rotor is connected with a second locking nut suitable for locking the second driven gear and the second thrust bearing, and the scraper is supported on the mounting frame through the second thrust bearing.

[0015] As the improvement of the above technical scheme, the adjusting rod is rotatably connected with the transmission shaft through a bearing and / or a ball head.

[0016] As the improvement of the above technical scheme, the two ends of the transmission shaft are sleeved with third bearings, the third bearings sleeve the adjusting rod, the two third bearings clamp the transmission shaft, the adjusting rod is suitable for being sleeved from the upper end of the transmission shaft to the lower end of the transmission shaft, and the adjusting rod is connected with a third locking nut suitable for locking the lower third bearing.

[0017] As the improvement of the above technical scheme, the adjusting rod is rotatably connected with the transmission shaft through a bearing and / or a ball head.

[0018] As the improvement of the above technical scheme, the mounting frame is provided with two main layer plates, the lower sides of the two main layer plates are provided with at least one installation cavity which is open on one side, the upper end of the stirring paddle and the transmission shaft are rotatably connected with the lower main layer plate, the mounting frame is provided with a vertical plate suitable for being supported on the upper end of the tank cover, and the vertical plate is detachably connected with the tank cover. BRIEF DESCRIPTION OF DRAWINGS

[0019] The specific embodiment of the utility model will be further and specifically explained below in combination with the drawings, in which:

[0020] Figure 1 It is a structural schematic view of the dextran preparation device of the embodiment of the utility model;

[0021] Figure 2 It is a sectional view of the dextran preparation device; Figure 1 It is a sectional view of the dextran preparation device;

[0022] Figure 3 It is an exploded view of the dextran preparation device; Figure 2 It is an exploded view of the dextran preparation device;

[0023] Figure 4 It is an exploded view of the dextran preparation device; Figure 2A partial structure front view of a dextran preparation device is shown.

[0024] The drawings are only one of the specific embodiments of the present application, and the form and structure of the specific embodiment should not limit the expansion of other embodiments.

[0025] Reaction tank 100, tank body 110, tank cover 120, mounting bracket 130, hook 131, main layer plate 132, vertical plate 133;

[0026] Stirring paddle 200, first driven gear 210, first thrust bearing 220, first locking nut 230;

[0027] Shovel scraping paddle 300, scraper 310, rotor 320, second driven gear 330, second thrust bearing 340, second locking nut 350;

[0028] Transmission shaft 400, first transmission gear 410, second transmission gear 420, fourth locking nut 430;

[0029] Motor 500, driving gear 510;

[0030] Positioning rod 600, third bearing 610, third locking nut 620, return spring 630, lug 640. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0032] Reference Figures 1 to 4The utility model provides a dextran preparation device, including a reaction tank 100, a stirring paddle 200, a scraping paddle 300, a transmission shaft 400, a motor 500, a position adjustment rod 600 and a limiting structure. The stirring paddle 200 is accommodated in the reaction tank 100, and the upper end of the rotating shaft of the stirring paddle 200 is rotatably connected to the top of the reaction tank 100 and is provided with a first driven gear 210. The scraping paddle 300 includes a scraper 310 suitable for scraping the inner wall of the reaction tank 100 and a rotor 320 connected to the scraper 310. The rotor 320 is rotatably connected to the top of the reaction tank 100 and is provided with a second driven gear 330. The transmission shaft 400 is rotatably connected to the reaction tank 100, and the two ends of the transmission shaft 400 are respectively A first transmission gear 410 and a second transmission gear 420 are provided, and a motor 500 is installed on the top of the reaction tank 100. The output shaft of the motor 500 is provided with a driving gear 510. The adjustment rod 600 is suitable for driving the transmission shaft 400 to move, so that the second transmission gear 420 alternately engages with the first driven gear 210 and the second driven gear 330. The first transmission gear 410 is suitable for maintaining engagement with the driving gear 510 when the transmission shaft 400 moves. The scraping paddle 300 and the stirring paddle 200 are both driven by the motor 500. The limiting structure is suitable for limiting the transmission shaft 400 or the adjustment rod 600, so that the second transmission gear 420 remains engaged with the first driven gear 210 or the second driven gear 330.

[0033] From the above description, it can be seen that the motor 500, the driving gear 510, the first transmission gear 410, the transmission shaft 400, the second transmission gear 420, the first driven gear 210 and the stirring paddle 200 are transmitted in sequence, or the motor 500, the driving gear 510, the first transmission gear 410, the transmission shaft 400, the second transmission gear 420, the second driven gear 330 and the scraping paddle 300 are transmitted in sequence; in addition, the driving gear 510 is fixedly connected to the output shaft of the motor 500, the first transmission gear 410 and the second transmission gear 420 are both fixedly connected to the transmission shaft 400, the first driven gear 210 is fixedly connected to the stirring paddle 200, and the second driven gear 330 is fixedly connected to the scraping paddle 300.

[0034] The "fixed connection" can be one-piece molding (molding, 3D printing, welding, etc.), snap connection, ferrule, key bar connection, spline structure connection, etc.

[0035] Reference Figure 2 、 Figure 3 The reaction tank 100 is provided with a feed port at the top and a discharge port at the bottom, and both the feed port and the discharge port are connected to corresponding valve bodies or cover plates.

[0036] Reference Figures 1 to 4 When the transmission shaft 400 moves, the first transmission gear 410 is constantly engaged with the driving gear 510 , so it can be understood that the first transmission gear 410 and the driving gear 510 are both spur gears (conventional gears).

[0037] Referring to Figure 2 , Figure 3 , the scraping paddle 300 is adapted to rotate the inner wall of the reaction tank 100, so the reaction tank 100 is cylindrical / spherical, the scraping paddle 300 is centered relative to the reaction tank 100, and the rotor 320 of the scraping paddle 300 is centered relative to the reaction tank 100.

[0038] In practice, the stirring paddle 200 is generally vertically arranged / vertically extended, i.e. the first driven gear 210 is vertically arranged / vertically extended. In some arrangements, referring to Figures 1 to 4 , the scraping paddle 300 and the stirring paddle 200 are concentrically arranged, the driving gear 510 is vertically extended, the transmission shaft 400 is vertically movable, and the first driven gear 210 and the second driven gear 330 are straight gears.

[0039] In some arrangements, the scraping paddle 300 and the stirring paddle 200 are eccentrically arranged, i.e. the scraping paddle 300 is centered relative to the reaction tank 100, and the stirring paddle 200 is not centered relative to the reaction tank 100, the driving gear 510 is horizontally extended, i.e. the motor 500 is horizontally placed, the transmission shaft 400 is horizontally movable, and the first driven gear 210 and the second driven gear 330 are bevel gears.

[0040] Referring to Figures 1 to 4 , for the concentric arrangement of the scraping paddle 300 and the stirring paddle 200, a through hole is provided at the shaft core of the scraping paddle 300, which is adapted for the upper end of the stirring paddle 200 to pass through, so that the stirring paddle 200 does not affect the static state of the scraping paddle 300 when the stirring paddle 200 rotates, and the scraping paddle 300 does not affect the static state of the stirring paddle 200 when the scraping paddle 300 rotates.

[0041] Referring to Figures 1 to 4 , the operation process of the utility model can be as follows: adding materials, supplementing raw materials to the reaction tank 100 through the feed inlet at the top of the reaction tank 100;

[0042] stirring, the transmission shaft 400 is moved to the corresponding position and locked, so that the second transmission gear 420 remains engaged with the first driven gear 210, the motor 500 is started, and the motor 500 drives the driving gear 510, the first transmission gear 410, the transmission shaft 400, the second transmission gear 420, the first driven gear 210 and the stirring paddle 200 in sequence, the stirring paddle 200 stirs the material in the reaction tank 100, so that the material is fully mixed and reacted, such as fermentation;

[0043] discharging finished products, opening the discharge outlet at the bottom of the reaction tank 100, and discharging the finished product liquid / finished product slurry in the reaction tank 100 to other equipment, such as a collection tank, etc. through the discharge outlet;

[0044] The cleaning is performed by pouring a cleaning liquid, such as water, into the reaction tank 100 through the feed inlet at the top of the reaction tank 100, moving the transmission shaft 400 to the corresponding position and locking it, so that the second transmission gear 420 is kept engaged with the second driven gear 330, starting the motor 500, and sequentially driving the driving gear 510, the first transmission gear 410, the transmission shaft 400, the second transmission gear 420, the second driven gear 330 and the scraping paddle 300. The scraping paddle 300 rotates and scrapes the material attached to the inner wall of the reaction tank 100, and the rotating scraping paddle 300 causes the cleaning liquid to flow and wash the inner wall of the reaction tank 100 and the stirring paddle 200.

[0045] The cleaning process is performed once or multiple times to effectively remove the residual material in the reaction tank 100.

[0046] In the product discharging process, when the reaction tank 100 is almost empty, such as only 5%-10% of the capacity, the stirring paddle 200 is first driven to rotate, so that the stirring paddle 200 throws off the product, and then the scraping paddle 300 is driven to rotate to scrape off the product on the inner wall of the reaction tank 100. The continuous rotation of the scraping paddle 300 causes the reaction tank 100 to be more completely emptied of the product, improves the actual production rate of the product, and reduces the cost of cleaning the reaction tank 100.

[0047] Compared with the prior art, the beneficial effects of the present application include: the scraping paddle 300 does not need to be disassembled, and can be directly called when the reaction tank 100 needs to be cleaned; the position adjusting rod 600 is directly operated to complete the switching of the motor 500 between the stirring and cleaning processes, the operation is simple, the stirring and cleaning share the same power source, and the design of the power and its supporting structure is saved; when the material is stirred, the scraping paddle 300 simultaneously prevents the peripheral material from being stirred, avoids the material from rotating in the same direction, and increases the mixing effect of the material.

[0048] Preferably, the scraping plate 310 and the rotor 320 of the scraping paddle 300 are integrally formed.

[0049] Preferably, the stirring paddle is provided with a spiral extending paddle blade and / or a radial paddle blade with an inclined cross section; when the material and the cleaning liquid are stirred, the material and the cleaning liquid are rolled to a certain extent, which facilitates the full mixing of the material and the full washing of the inner wall of the reaction tank and the stirring paddle by the cleaning liquid.

[0050] Referring to Figure 2 , Figure 3 In some embodiments of the present application, the scraping plate 310 is a closed frame, the two side edges of the closed frame are adapted to scrape the side wall of the reaction tank 100, and the top edge and the bottom edge of the closed frame are adapted to scrape the inner top and the inner bottom of the reaction tank 100, respectively, so that the side wall, the inner top and the inner bottom of the reaction tank 100 are all well cleaned.

[0051] Referring to Figures 1 to 4In some embodiments of the utility model, the top of the reaction tank 100 is provided with a mounting rack 130, the upper end of the stirring paddle 200 and the transmission shaft 400 are all rotationally connected to the mounting rack 130, and the motor 500 is installed on the mounting rack 130.

[0052] In some designs, the position adjusting rod 600 is directly connected to the transmission rod,

[0053] Referring to Figures 1 to 3 In some embodiments of the utility model, the reaction tank 100 comprises a tank body 110 and a tank cover 120 detachably connected to the tank body 110, and the mounting rack 130 is arranged on the upper end of the tank cover 120.

[0054] Referring to Figures 1 to 4 In some embodiments of the utility model, the first driven gear 210 and the first thrust bearing 220 are both detachably sleeved on the upper end of the stirring paddle 200, the upper end of the stirring paddle 200 is connected with a first locking nut 230 suitable for locking the first driven gear 210 and the first thrust bearing 220, and the stirring paddle 200 is supported on the mounting rack 130 through the first thrust bearing 220. The stirring paddle 200 is detachable, and the disassembly and assembly are relatively convenient. The thrust bearing can bear strong axial force, the stirring paddle 200 is firmly installed on the mounting rack 130 through the first thrust bearing 220, and the stirring paddle 200 can stably rotate when working. Referring to Figure 2 、 Figure 4 The first locking nut 230 locks the first driven gear 210 and the first thrust bearing 220 together, and the first driven gear 210 and the first thrust bearing 220 are firmly fixed on the stirring paddle 200. In the disassembly and assembly of the utility model, the first locking nut 230, the first thrust bearing 220 and the first driven gear 210 are sequentially disassembled, and then the stirring paddle 200 is pulled out from top to bottom.

[0055] For the bearing, it can be understood that the inner ring sleeve A part, the outer ring string sleeve B part, the sleeve is a transition fit (fixed connection), and even the string sleeve is also a transition fit (fixed connection), so as to ensure the stable rotary connection between the A part and the B part.

[0056] Referring to Figures 2 to 4In some embodiments of the utility model, rotor 320 and scraper 310 are integrally formed, second driven gear 330 and second thrust bearing 340 are all detachable sleeve rotor 320, rotor 320 is connected with the second locking nut 350 suitable for locking second driven gear 330 and second thrust bearing 340, and scraper paddle 300 is supported on mounting frame 130 through second thrust bearing 340.Scraper paddle 300 is detachable, and disassembly and maintenance are more convenient, thrust bearing can bear strong axial force, avoids that scraper paddle 300 is too much friction reaction tank 100 because of dead weight and is firmly installed in mounting frame 130 through second thrust bearing 340, and stirring paddle 200 stably rotates when working. Figure 2 、 Figure 4 Second locking nut 350 locks second driven gear 330 and second thrust bearing 340 together, and second driven gear 330 and second thrust bearing 340 are firmly fixed on scraper paddle 300.

[0057] In the disassembly of the utility model, second locking nut 350, second driven gear 330 and second thrust bearing 340 are successively disassembled under the condition that stirring paddle 200 has been disassembled, and then scraper paddle 300 is pulled out from top to bottom.

[0058] In some settings, the adjusting rod is suitable for rotating with the transmission shaft 400, that is, when motor 500 drives stirring paddle 200 or scraper paddle 300 through transmission shaft 400, adjusting rod 600 rotates with transmission shaft 400.

[0059] To avoid that adjusting rod 600 rotates and mistakenly hurts the approaching personnel, preferably, adjusting rod 600 is rotatably connected with transmission shaft 400 through bearing and / or ball head, and adjusting rod 600 can not rotate when dextran preparation device performs mixing or cleaning. Figures 2 to 4

[0060] When dextran preparation device performs mixing or cleaning, adjusting rod 600 can not rotate. Figures 1 to 4 In some embodiments of the utility model, both ends of transmission shaft 400 are sleeved with third bearing 610, third bearing 610 sleeves adjusting rod 600, two third bearings 610 clamp transmission shaft 400, adjusting rod 600 is suitable for stringing from the upper end of transmission shaft 400 to the lower end of transmission shaft 400, adjusting rod 600 is connected with third locking nut 620 suitable for locking lower third bearing 610, and the locking installation of transmission shaft 400 and two third bearings 610 is perfected in one step.

[0061] When dextran preparation device performs mixing or cleaning, adjusting rod 600 can not rotate. Figures 2 to 4 ​The position adjusting rod 600 is sequentially threaded from top to bottom through the upper third bearing 610, the transmission shaft 400, the lower third bearing 610 and the third locking nut 620, and the third locking nut 620 locks the transmission shaft 400 and the two third bearings 610 at one time, so it is known that the position adjusting rod 600 is in the form of a stepped shaft, the hole diameter of the upper third bearing 610 is larger than the hole diameter of the lower third bearing 610, the shaft shoulder of the position adjusting rod 600 locks the upper third bearing 610, and the shaft shoulder of the position adjusting rod 600 and the third locking nut 620 form a clamping effect.

[0062] With reference to Figures 1 to 4 In some embodiments of the utility model, still include reset spring 630, the upper end of position adjusting rod 600 is provided with lug 640, the lower end of reset spring 630 is supported in mounting frame 130, the upper end of reset spring 630 is suitable for supporting lug 640, reset spring 630 is suitable for driving transmission shaft 400 to reset upwards, makes second transmission gear 420 engage first driven gear 210, mounting frame 130 is provided with catch 131, position adjusting rod 600 is suitable for pressing reset spring 630 and rotates lug 640 and is buckled into catch 131, makes second transmission gear 420 downwardly engage second driven gear 330. Therefore, reset spring 630, lug 640, catch 131 and the like form a limiting structure.

[0063] With reference to Figures 1 to 3 The top of the position adjusting rod 600 is provided with an internal hexagonal slot or a screwdriver slot, and the position adjusting rod 600 is pressed and rotated by using an internal hexagonal wrench or a screwdriver, so that the lug 640 is buckled into or separated from the catch 131.

[0064] In some embodiments of the utility model, the mounting frame 130 is provided with two layer cavities in the up-down direction, the position adjusting rod 600 is detachably horizontally inserted with a pin shaft, and the pin shaft is suitable for being arranged in different layer cavities, so that the position adjusting rod 600 and the transmission shaft 400 are located at different heights, and the second transmission gear 420 engages the first driven gear 210 or the second driven gear 330. For example, in the up-regulating process, the pin shaft is separated from the position adjusting rod 600, and then the position adjusting rod 600 is pulled upwards, so that the position adjusting rod 600, the transmission shaft 400 and the second transmission gear 420 are lifted, the second transmission gear 420 is adjusted from the second driven gear 330 to the first driven gear 210, at this time, the insertion hole of the position adjusting rod 600 corresponds to the upper layer cavity, the pin shaft is inserted into the insertion hole at this time, and the pin shaft is limited in the upper layer cavity, so that the position adjusting rod 600 and the transmission shaft 400 are limited at a predetermined height. When the position adjusting rod 600 needs to rotate with the transmission shaft 400, the pin shaft is swung in the upper layer cavity. Therefore, the layer cavities and the pin shaft form a limiting structure.

[0065] With reference to Figures 1 to 4In some embodiments of the utility model, one end of the first transmission gear 410 is sleeved with the transmission shaft 400, the other end of the transmission shaft 400 is sleeved with the second transmission gear 420, and the other end of the transmission shaft 400 is connected with another fourth locking nut 430 suitable for locking the second transmission gear 420. The first transmission gear 410 and the second transmission gear 420 are convenient to disassemble and maintain. After the transmission shaft 400 is removed from the positioning rod 600, the first driven gear 210 and the second driven gear 220 are further disassembled.

[0066] Referring to Figures 1 to 4 Preferably, the mounting frame 130 is provided with two main layer plates 132, and at least one side of each of the two main layer plates 132 is provided with an openable mounting cavity. The upper end of the stirring paddle 200 and the transmission shaft 400 are rotatably connected to the lower main layer plate 132, and the output shaft of the motor 500 and the positioning rod 600 are both passed through the upper main layer plate 132 from top to bottom. Each gear and nut is relatively easy to disassemble, and then the stirring paddle 200, the scraping paddle 300 and the positioning rod 600 are disassembled.

[0067] To solve the disassembly problem of the transmission shaft 400, preferably, the mounting frame 130 is provided with a vertical plate 133 suitable for being supported on the upper end of the tank cover 120, and the vertical plate 133 is detachably connected to the tank cover 120, such as being connected by screws. After the transmission shaft 400 is disassembled from the transmission gears and the positioning rod 600, it is pulled out from below the mounting frame 130. In some embodiments, the transmission shaft 400 includes two detachable segments connected in series.

[0068] The above embodiments are only used to illustrate the technical solutions of the utility model and not to limit them, and any modification or equivalent replacement without departing from the spirit and scope of the utility model should be covered in the scope of the technical solutions of the utility model.

Claims

1. A dextran preparation device, characterized in that: It comprises a reaction tank (100) and: A stirring paddle (200) is accommodated in the reaction tank (100), the upper end of the rotating shaft of the stirring paddle (200) is rotatably connected to the top of the reaction tank (100), and is provided with a first driven gear (210); A scraping paddle (300) comprises a scraper (310) adapted to scrape the inner wall of the reaction tank (100) and a rotor (320) connected to the scraper (310), wherein the rotor (320) is rotatably connected to the top of the reaction tank (100) and is provided with a second driven gear (330); A transmission shaft (400) is rotatably connected to the reaction tank (100), and a first transmission gear (410) and a second transmission gear (420) are respectively provided at both ends of the transmission shaft (400); A motor (500) is installed on the top of the reaction tank (100), and an output shaft of the motor (500) is provided with a driving gear (510); a positioning rod (600) adapted to drive the transmission shaft (400) to move, so that the second transmission gear (420) alternately engages with the first driven gear (210) and the second driven gear (330); the first transmission gear (410) is adapted to remain engaged with the driving gear (510) when the transmission shaft (400) moves; and the scraping paddle (300) and the stirring paddle (200) are both driven by the motor (500); The limiting structure is suitable for limiting the transmission shaft (400) or the adjustment rod (600) so that the second transmission gear (420) remains engaged with the first driven gear (210) or the second driven gear (330).

2. The dextran preparation device according to claim 1, wherein The scraper (310) is a closed frame, the two side edges of which are suitable for scraping the side walls of the reaction tank (100), and the top and bottom edges of which are suitable for scraping the inner top and inner bottom of the reaction tank (100), respectively.

3. The dextran preparation device according to claim 1, wherein A mounting frame (130) is provided on the top of the reaction tank (100), the upper end of the stirring paddle (200) and the transmission shaft (400) are both rotatably connected to the mounting frame (130), and the motor (500) is installed on the mounting frame (130).

4. The dextran preparation device according to claim 3, wherein The reaction tank (100) comprises a tank body (110) and a tank cover (120) detachably connected to the tank body (110), and the mounting frame (130) is arranged on the upper end of the tank cover (120).

5. The dextran preparation device according to claim 4, characterized in that, The first driven gear (210) and the first thrust bearing (220) are both detachably clamped to the upper end of the stirring paddle (200); the upper end of the stirring paddle (200) is connected to a first locking nut (230) suitable for locking the first driven gear (210) and the first thrust bearing (220); the stirring paddle (200) is supported on the mounting frame (130) through the first thrust bearing (220).

6. The dextran preparation device according to claim 5, characterized in that: The rotor (320) and the scraper (310) are integrally formed, the second driven gear (330) and the second thrust bearing (340) are both detachably clamped to the rotor (320), the rotor (320) is connected to a second locking nut (350) suitable for locking the second driven gear (330) and the second thrust bearing (340), and the scraper paddle (300) is supported on the mounting frame (130) through the second thrust bearing (340).

7. The dextran preparation device according to any one of claims 4 to 6, characterized in that: The positioning rod (600) is rotatably connected to the transmission shaft (400) via a bearing and / or a ball head.

8. The dextran preparation device according to claim 7, characterized in that: Both ends of the transmission shaft (400) are fitted with third bearings (610), the third bearings (610) are fitted with the adjustment rod (600), the two third bearings (610) are clamped with the transmission shaft (400), the adjustment rod (600) is suitable for being threaded from the upper end of the transmission shaft (400) to the lower end of the transmission shaft (400), and the adjustment rod (600) is connected with a third locking nut (620) suitable for locking the third bearing (610) below.

9. The dextran preparation device according to claim 8, characterized in that: The invention also includes a reset spring (630), a lug (640) is provided at the upper end of the adjustment rod (600), the lower end of the reset spring (630) is supported on the mounting frame (130), the upper end of the reset spring (630) is suitable for supporting the lug (640), the reset spring (630) is suitable for driving the transmission shaft (400) to reset upward, so that the second transmission gear (420) engages with the first driven gear (210), the mounting frame (130) is provided with a hook (131), and the adjustment rod (600) is suitable for pressing down the reset spring (630) and screwing the lug (640) into the hook (131), so that the second transmission gear (420) engages downward with the second driven gear (330).

10. The dextran preparation device according to claim 8 or 9, characterized in that: The mounting frame (130) is provided with two main layers (132), and the lower parts of the two main layers (132) are each provided with a mounting cavity with at least one side being openable, and the upper end of the stirring paddle (200) and the transmission shaft (400) are rotatably connected to the lower main layer (132); the mounting frame (130) is provided with a vertical plate (133) suitable for supporting the upper end of the tank cover (120), and the vertical plate (133) is detachably connected to the tank cover (120).

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