A nanocrystalline cellulose high-temperature acidolysis reaction device

Abstract

This invention relates to the field of chemical equipment technology, and in particular to a high-temperature acid hydrolysis reactor for nanocrystalline cellulose. Addressing the problems of low stirring efficiency and inconvenient discharge in existing acid hydrolysis reactors, the invention proposes the following solution: A base and a reaction vessel positioned directly above the base. An assembly is mounted on the top of the base, and a stirring assembly is installed inside the reaction vessel. The assembly includes a support mechanism and a swaying mechanism. The support mechanism includes a fixed toothed ring fixed to the top of the base, a mounting ring rotatably connected to the top surface of the fixed toothed ring, and two mounting brackets symmetrically fixed to the top surface of the mounting ring. The reaction vessel is located between the two mounting brackets, and each mounting bracket is rotatably connected to a rotating shaft, which is fixedly connected to the outer walls of both sides of the reaction vessel. The swaying mechanism includes a drive assembly and a transmission assembly. This invention effectively improves the acid hydrolysis rate and mixing effect of the substances inside the reaction vessel, facilitates discharge, and reduces material residue.

Description

Technical Field

[0001] This invention relates to the field of chemical equipment technology, and in particular to a high-temperature acid hydrolysis device for nanocrystalline cellulose. Background Technology

[0002] Currently, acid hydrolysis is one of the key steps in the production of nanocrystalline cellulose. Existing acid hydrolysis equipment typically includes a reaction vessel and a stirring mechanism inside the vessel to agitate the materials within the vessel and promote the acid hydrolysis reaction.

[0003] However, existing acid hydrolysis reactors suffer from the following problems during operation: First, the stirring method is simplistic, typically relying on uniaxial rotation, which makes it difficult to fully mix the materials within the reactor, resulting in low acid hydrolysis efficiency. Second, the reactors are usually fixed in place, making it difficult to completely discharge the material, which tends to remain at the bottom of the reactor, leading to material waste and increased cleaning difficulty. Therefore, there is an urgent need for a high-temperature acid hydrolysis reactor for nanocrystalline cellulose that can improve stirring efficiency and facilitate material discharge. To this end, this solution proposes a high-temperature acid hydrolysis reactor for nanocrystalline cellulose. Summary of the Invention

[0004] The present invention proposes a high-temperature acid hydrolysis device for nanocrystalline cellulose, which solves the problems of low stirring efficiency and inconvenient material discharge in the existing acid hydrolysis devices.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A high-temperature acid hydrolysis apparatus for nanocrystalline cellulose includes a base and a reaction vessel located directly above the base. An assembly is mounted on the top of the base, and a stirring assembly is installed inside the reaction vessel. The mounting assembly includes a support mechanism and a swaying mechanism. The support mechanism includes a fixed toothed ring fixed to the top of the base, a mounting ring rotatably connected to the top surface of the fixed toothed ring, and two mounting brackets symmetrically fixed to the top surface of the mounting ring. The reaction vessel is located between the two mounting brackets, and each mounting bracket is rotatably connected to a rotating shaft. The two rotating shafts are respectively fixed to the outer walls of the two sides of the reaction vessel. The swaying mechanism includes a drive assembly mounted on the base for driving the mounting ring to reciprocate and rotate, and a transmission assembly mounted on the support frame for driving the rotating shaft to rotate when the mounting ring rotates. The top of the reaction vessel is detachably fixed with a top cover. The stirring assembly includes a main stirring shaft rotatably connected to the center of the top of the top cover, a mounting plate fixed to the outer periphery of the main stirring shaft, a secondary stirring shaft rotatably connected to the outer periphery of the mounting plate, and a linkage mechanism mounted on the mounting plate for driving the secondary stirring shaft to rotate while following the main stirring shaft.

[0006] The above technical solution, by setting up a shaking mechanism, drives the mounting ring to rotate back and forth, causing the reaction tank to shake left and right. At the same time, the transmission component drives the rotating shaft to rotate when the mounting ring rotates, thereby causing the reaction tank to flip back and forth. Combined with the stirring effect of the stirring assembly, it significantly improves the mixing uniformity of materials and the acid hydrolysis reaction rate.

[0007] As a further improvement to the above solution, the fixed toothed ring and the mounting ring are coaxially arranged, and both the fixed toothed ring and the mounting ring are incomplete toothed rings with a notch on one side, and the arc length of the mounting ring is smaller than the arc length of the fixed toothed ring.

[0008] The above technical solution sets the fixed toothed ring and the mounting ring as incomplete toothed rings, which makes it convenient to place the container under the reaction tank without obstruction during material discharge, and allows it to slide freely from the top of the base to the bottom of the reaction tank. The arc length of the mounting ring is greater than that of the fixed toothed ring, which can prevent the end of the mounting ring from extending to the outside of the end of the mounting ring.

[0009] As a further improvement to the above solution, a 5-10cm gap is provided between each end of the mounting ring.

[0010] The above technical solution can further prevent the end of the mounting ring from extending to the outside of the mounting ring end during reciprocating rotation, thus further ensuring the stability of the mounting ring rotation.

[0011] As a further improvement to the above solution, the drive assembly includes a fixed shaft rotatably connected to the top of the base, a drive gear and a transmission gear sleeved on the outer periphery of the fixed shaft, and a power component installed on the top surface of the base for driving the transmission gear to rotate. The outer ring of the mounting ring is fixed with a movable gear ring coaxially arranged therewith, and the movable gear ring meshes with the drive gear.

[0012] The above technical solution transmits the driving force of the power component to the mounting ring through a gear transmission mechanism.

[0013] As a further improvement to the above solution, the power component includes a telescopic component mounted on the top surface of the base and a transmission rack fixed to the output end of the telescopic component, the transmission rack meshing with a transmission gear.

[0014] The above technical solution utilizes the telescopic movement of the telescopic component to convert linear motion into rotational motion through rack and pinion transmission, thereby realizing the reciprocating rotation drive of the mounting ring.

[0015] As a further improvement to the above solution, the transmission assembly includes a transmission shaft rotatably connected to the mounting bracket, a worm gear fixed to the top of the transmission shaft, a connecting gear fixed to the bottom of the transmission shaft, and a worm wheel sleeved on the outer periphery of the shaft. The worm wheel meshes with the worm gear, and the connecting gear meshes with a fixed gear ring.

[0016] The above technical solution utilizes the meshing relationship between the connecting gear and the fixed gear ring to drive the transmission shaft to rotate when the mounting ring rotates. This, in turn, drives the rotating shaft to rotate through the worm gear mechanism, achieving a linkage effect where the reaction vessel sways left and right while simultaneously flipping back and forth.

[0017] As a further improvement to the above solution, a feed pipe is installed on the top of the top cover, and a discharge pipe is installed on the bottom of the reaction tank. The middle of the line connecting the two rotating shafts of the discharge pipe is located near the bottom edge of the reaction tank. Valves are installed on both the feed pipe and the discharge pipe.

[0018] The above technical solution sets the discharge pipe in a specific position, and in conjunction with the tilting and shaking function of the reaction tank, it is easy to tilt the reaction tank during discharge, so that the material can be discharged smoothly and the residue can be reduced.

[0019] As a further improvement to the above scheme, a fixed gear ring is installed on the top of the inner ring of the reaction vessel and is coaxially arranged therewith. The linkage mechanism includes a linkage shaft that is rotatably connected to the top surface of the mounting plate along the radial direction of the reaction vessel, a linkage gear fixed at one end of the linkage shaft, and a driving bevel gear sleeved on the outer periphery of the linkage shaft. The linkage gear is located on the top of the fixed gear ring and meshes with it. The top of the auxiliary stirring shaft extends to the top of the mounting plate and is fixed with a driven bevel gear that meshes with the driving bevel gear.

[0020] The above technical solution uses the meshing of the linkage gear and the fixed gear ring to drive the linkage shaft to rotate when the main stirring shaft revolves, and then drives the secondary stirring shaft to rotate through the bevel gear transmission, thereby realizing the compound motion of the secondary stirring shaft's revolution and rotation, and improving the stirring effect.

[0021] As a further improvement to the above scheme, the driving bevel gear is located on the side of the driven bevel gear away from the main stirring shaft.

[0022] The above technical solution, by setting the position of the active bevel gear, makes the rotation direction of the auxiliary stirring shaft opposite to that of the main stirring shaft, further enhancing the turbulence of the material and improving the mixing efficiency.

[0023] As a further improvement to the above solution, the reaction vessel and the top cover are detachably fixed by fasteners. The fasteners include multiple fixing blocks fixed to the top of the outer periphery of the reaction vessel and corresponding fixing blocks fixed to the bottom of the outer periphery of the top cover, and the corresponding two fixing blocks are fixed by bolts.

[0024] The above technical solution uses a detachable connection method to facilitate the disassembly and assembly of the top cover, making it convenient to clean and maintain the inside of the reaction vessel.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By setting up a shaking mechanism, while driving the reaction vessel to shake back and forth, the transmission component can also drive the reaction vessel to flip and swing back and forth, thereby effectively improving the acid hydrolysis rate of the substances in the reaction vessel.

[0026] 2. By setting a main stirring shaft, a secondary stirring shaft, and a linkage mechanism inside the reaction vessel, the secondary stirring shaft can be driven to rotate simultaneously while the main stirring shaft rotates. Furthermore, by positioning the driving bevel gear on the side of the driven bevel gear away from the main stirring shaft, the rotation direction of the secondary stirring shaft is opposite to that of the main stirring shaft, thereby further improving the mixing effect of the materials in the reaction vessel.

[0027] 3. By setting the discharge pipe on one side of the bottom of the reaction tank, and with the shaking mechanism, the reaction tank can be easily tilted towards the side closer to the discharge pipe during discharge, thereby facilitating discharge while emptying the material in the reaction tank and reducing residue. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 This is a cross-sectional view of the reaction vessel; Figure 4 This is a structural diagram of the linkage shaft, gear ring, and linkage gear; Figure 5 This is a schematic diagram of the discharge pipe.

[0029] Explanation of key symbols: 1. Base; 2. Reaction vessel; 3. Fixed gear ring; 4. Mounting ring; 5. Drive shaft; 6. Drive gear; 7. Mounting bracket; 8. Rotating shaft; 9. Worm gear; 10. Worm; 11. Stirring motor; 12. Feed pipe; 13. Top cover; 14. Fixing block; 15. Discharge pipe; 16. Connecting gear; 17. Telescopic component; 18. Drive rack; 19. Movable gear ring; 20. Fixed shaft; 21. Drive gear; 22. Main stirring shaft; 23. Linkage gear; 24. Linkage shaft; 25. Fixed gear ring; 26. Mounting plate; 27. Secondary stirring shaft; 28. Driven bevel gear; 29. ​​Driven bevel gear. Detailed Implementation

[0030] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0031] Example 1:

[0032] like Figure 1and Figure 5 As shown, this embodiment provides a high-temperature acid hydrolysis apparatus for nanocrystalline cellulose. The apparatus mainly includes a base 1, a reaction vessel 2, a mounting assembly, and a stirring assembly. The base 1 is placed on the ground or operating platform, serving as the supporting foundation for the entire apparatus. The reaction vessel 2 is located directly above the base 1 and is used to contain the nanocrystalline cellulose material for high-temperature acid hydrolysis. The mounting assembly is installed on top of the base 1 to support the reaction vessel 2 and drive its movement. The stirring assembly is installed inside the reaction vessel 2 for stirring and mixing the material.

[0033] Specifically, the mounting assembly includes a support mechanism and a swaying mechanism. The support mechanism mainly includes a fixed gear ring 3, a mounting ring 4, a mounting bracket 7, and a rotating shaft 8. The fixed gear ring 3 is fixed to the top of the base 1, serving as the fixed foundation for the support mechanism. The mounting ring 4 is rotatably connected to the top surface of the fixed gear ring 3 and can rotate relative to the fixed gear ring 3. Two mounting brackets 7 are symmetrically fixed to the top surface of the mounting ring 4 and move together with the mounting ring 4. The reaction vessel 2 is located between the two mounting brackets 7, and two rotating shafts 8 are rotatably connected to the two mounting brackets 7 respectively, and the two rotating shafts 8 are fixedly connected to the outer walls of both sides of the reaction vessel 2. With this structure, the reaction vessel 2 is "suspended and supported" above the base 1, allowing it to sway left and right by rotating the mounting ring 4 and to flip forward and backward by rotating the rotating shafts 8. The swaying mechanism includes a drive assembly and a transmission assembly. The drive assembly is mounted on the base 1 and drives the mounting ring 4 to reciprocate. The transmission assembly is mounted on the mounting bracket 7 and drives the rotating shaft 8 to rotate simultaneously with the rotation of the mounting ring 4, thereby achieving the linkage between the swaying and overturning of the reaction vessel 2. The specific structural forms of the drive assembly and transmission assembly will be described in detail in subsequent embodiments.

[0034] The mixing assembly mainly includes a main mixing shaft 22, a mounting plate 26, a secondary mixing shaft 27, and a linkage mechanism. The main mixing shaft 22 is rotatably connected to the top center of the top cover 13 and is driven to rotate by a motor mounted on the top surface of the top cover 13. The mounting plate 26 is fixed to the outer periphery of the main mixing shaft 22 and rotates with it. The secondary mixing shafts 27 are rotatably connected to the outer periphery of the mounting plate 26, and there can be one or more of them. The linkage mechanism is mounted on the mounting plate 26 and is used to drive the secondary mixing shafts 27 to rotate on their own axis while revolving around the main mixing shaft 22, thereby increasing the complexity and uniformity of the mixing. The specific structure of the linkage mechanism will be described in detail in subsequent embodiments.

[0035] In addition, a top cover 13 is detachably fixed to the top of reaction vessel 2. For example... Figure 5As shown, the reaction vessel 2 and the top cover 13 are detachably fixed together by fasteners. The fasteners include multiple fixing blocks 14 fixed to the top outer periphery of the reaction vessel 2 and correspondingly fixed to the bottom outer periphery of the top cover 13, with corresponding fixing blocks 14 secured together by bolts. When cleaning or maintenance of the interior of the reaction vessel 2 is required, the top cover 13 can be easily removed from the reaction vessel 2 simply by unscrewing the bolts. This detachable connection method not only facilitates maintenance but also the installation and repair of the stirring assembly. It should be understood that although this embodiment shows a connection via fixing blocks 14 and bolts, other detachable connection methods such as snap-fit ​​connections or flange connections can be used in other embodiments, as long as the detachable fixing of the top cover 13 to the reaction vessel 2 can be achieved.

[0036] Through the above structure, this embodiment constructs the basic framework of the high-temperature acid hydrolysis reactor for nanocrystalline cellulose, establishing the spatial layout and connection relationships of each component, and providing a physical carrier for the subsequent description of functional modules. The suspended support design of the reaction vessel 2 and the detachable design of the top cover 13 lay the structural foundation for improving the efficiency and convenience of the acid hydrolysis reaction.

[0037] Example 2:

[0038] This embodiment, based on Embodiment 1, provides a detailed description of the specific structure and working principle of the shaking mechanism. Specifically, the fixed toothed ring 3 and the mounting ring 4 are coaxially arranged, and both the fixed toothed ring 3 and the mounting ring 4 are incomplete toothed rings with a notch on one side. The arc length of the mounting ring 4 is less than the arc length of the fixed toothed ring 3. By setting the fixed toothed ring 3 and the mounting ring 4 as incomplete toothed rings with notches, the rotation range of the mounting ring 4 relative to the fixed toothed ring 3 is limited, allowing it to oscillate back and forth within a preset angle. This causes the reaction vessel 2 to sway left and right within the preset angle, preventing excessive rotation of the reaction vessel 2 from causing the connecting pipes to become entangled or broken. Furthermore, a 5-10cm gap is provided between both ends of the mounting ring 4 and both ends of the fixed toothed ring 3. This gap design effectively prevents the end of the mounting ring from extending beyond the outer edge of the mounting ring during reciprocating rotation, further ensuring the stability of the mounting ring's rotation.

[0039] Regarding the specific structure of the driver component, such as Figure 1 and Figure 2As shown, the drive assembly includes a fixed shaft 20 rotatably connected to the top of the base 1, a drive gear 6 and a transmission gear 21 sleeved on the outer periphery of the fixed shaft 20, and a power component mounted on the top surface of the base 1 to drive the transmission gear 21 to rotate. A movable gear ring 19, coaxially arranged with the outer ring of the mounting ring 4, is fixed thereon and meshes with the drive gear 6. The power component includes a telescopic member 17 mounted on the top surface of the base 1 and a transmission rack 18 fixed to the output end of the telescopic member 17, which meshes with the transmission gear 21. The telescopic member 17 is preferably an electric telescopic rod or a hydraulic cylinder. Its telescopic movement drives the transmission rack 18 to perform linear reciprocating motion. The transmission rack 18 drives the meshing transmission gear 21 to rotate in both directions. The transmission gear 21 drives the drive gear 6 to rotate synchronously. The drive gear 6 then drives the movable gear ring 19 and the mounting ring 4 to rotate, thereby converting the linear motion of the telescopic member 17 into the rotational motion of the mounting ring 4, achieving the left-right reciprocating swaying of the reaction vessel 2. It should be understood that the power component is not limited to the form of telescopic component and rack and pinion, but can also be the form of motor directly driving gear, as long as the reciprocating rotation of mounting ring 4 can be achieved.

[0040] Regarding the specific structure of the transmission components, such as Figure 1 As shown, the transmission assembly includes a drive shaft 5 rotatably connected to the mounting bracket 7, a worm gear 10 fixed to the top of the drive shaft 5, a connecting gear 16 fixed to the bottom of the drive shaft 5, and a worm wheel 9 sleeved on the outer circumference of the rotating shaft 8. The worm wheel 9 meshes with the worm gear 10, and the connecting gear 16 meshes with the fixed gear ring 3. When the mounting ring 4 wobbles left and right under the action of the drive assembly, the connecting gear 16 rolls along the fixed gear ring 3. That is, while the mounting ring 4 revolves, the connecting gear 16 rotates under the meshing action of the fixed gear ring 3. The rotation of the connecting gear 16 drives the drive shaft 5 to rotate, the drive shaft 5 drives the worm gear 10 to rotate, the worm gear 10 drives the worm wheel 9 to rotate, and the worm wheel 9 drives the rotating shaft 8 to rotate, thereby realizing the forward and backward tilting of the reaction vessel 2. This design cleverly utilizes the left and right wobbling motion of the mounting ring 4 as a power source, eliminating the need for an additional tilting motor and achieving the linkage between "left and right wobbling" and "forward and backward tilting". In addition, the worm gear 9 and worm 10 have a self-locking function, which can ensure the stability of the reaction vessel 2 in a non-shaking state and prevent it from overturning at will.

[0041] Example 3:

[0042] This embodiment, based on Embodiments 1 and 2, focuses on a detailed explanation of the internal structure of the stirring assembly and the optimized design of the feed and discharge systems. The design of the stirring assembly directly affects the mixing uniformity of nanocrystalline cellulose during high-temperature acid hydrolysis, thereby influencing the reaction rate and product quality.

[0043] Regarding the specific structure of the mixing assembly, such as Figure 3 and Figure 4As shown, a fixed gear ring 25, coaxially arranged with the inner ring of the reaction vessel 2, is installed on the top of the inner ring. The linkage mechanism includes a linkage shaft 24 rotatably connected to the top surface of the mounting plate 26 along the radial direction of the reaction vessel 2, a linkage gear 23 fixed to one end of the linkage shaft 24, and a driving bevel gear 28 sleeved on the outer circumference of the linkage shaft 24. The linkage gear 23 is located on top of the fixed gear ring 25 and meshes with it. The top of the auxiliary stirring shaft 27 extends above the mounting plate 26 and is fixed with a driven bevel gear 29 that meshes with the driving bevel gear 28. The ingenious aspect of this structural design is that it utilizes the relatively stationary fixed gear ring 25 as a power source. When an external motor drives the main stirring shaft 22 to rotate, the mounting plate 26 drives the auxiliary stirring shaft 27 to revolve around the axis of the main stirring shaft 22. At the same time, the linkage gear 23 installed on the mounting plate 26 revolves with the mounting plate 26, and its trajectory passes through the fixed gear ring 25. Since the fixed gear ring 25 is stationary, the linkage gear 23 is forced to mesh with the fixed gear ring 25 and roll during the revolution, thereby generating its own rotation. The rotation of the linkage gear 23 drives the linkage shaft 24 to rotate, which in turn drives the active bevel gear 28 to rotate, and finally drives the auxiliary stirring shaft 27 to rotate through the driven bevel gear 29. Through this linkage mechanism, the auxiliary stirring shaft 27 achieves a combined motion of "revolution" and "rotation", which greatly increases the coverage area of ​​the stirring blades in the reaction vessel 2, reduces the dead zone of stirring, and allows the nanocrystalline cellulose particles to fully contact the acid hydrolysate, significantly improving the mixing efficiency.

[0044] Furthermore, the driving bevel gear 28 is located on the side of the driven bevel gear 29 furthest from the main stirring shaft 22. This positional relationship is not arbitrary but is designed to achieve a specific stirring effect. When the driving bevel gear 28 is located outside the driven bevel gear 29, the rotation direction of the auxiliary stirring shaft 27 is opposite to its revolution direction and also opposite to the rotation direction of the main stirring shaft 22. This reverse rotation can generate strong shear force and turbulent flow field inside the reaction vessel 2, effectively breaking the laminar flow state during the material mixing process, preventing the agglomeration of nanocrystalline cellulose, thereby further improving the uniformity and efficiency of the acid hydrolysis reaction. It should be understood that although bevel gear transmission is used in this embodiment to achieve reversal and power transmission, synchronous belt transmission or other gear sets can also be used in other embodiments, as long as the auxiliary stirring shaft 27 can rotate simultaneously with its revolution.

[0045] In terms of material inlet and outlet design, such as Figure 5As shown, a feed pipe 12 is installed on the top of the top cover 13, and a discharge pipe 15 is installed on the bottom of the reaction tank 2. The discharge pipe 15 is located near the bottom edge of the reaction tank 2, on the side of the line connecting the two rotating shafts 8. Valves are installed on both the feed pipe 12 and the discharge pipe 15. The discharge pipe 15 is located near the bottom edge of the reaction tank 2, rather than in the traditional center bottom, to accommodate the shaking and flipping function described in Embodiment 2. When discharging after the reaction, the shaking mechanism drives the reaction tank 2 to tilt and flip towards the side where the discharge pipe 15 is located. Because the discharge pipe 15 is located at the edge, the material in the reaction tank 2 can more smoothly converge towards the outlet of the discharge pipe 15 and be discharged under the action of gravity. This design effectively solves the problem of material residue easily remaining at the bottom of traditional reaction tanks, achieving complete material emptying, reducing material waste, and also reducing the difficulty of subsequent cleaning work. The valve design is used to control the timing of feeding and discharging, ensuring the airtightness and safety of the reaction process.

[0046] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention, such as replacing the telescopic component with a cylinder or motor crank-connecting rod mechanism, or replacing the gear transmission mechanism with a chain transmission mechanism, should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A high-temperature acid hydrolysis apparatus for nanocrystalline cellulose, comprising a base (1) and a reaction vessel (2) disposed directly above the base (1), characterized in that, An installation assembly is mounted on the top of the base (1), and a stirring assembly is installed inside the reaction vessel (2); The mounting assembly includes a support mechanism and a swaying mechanism. The support mechanism includes a fixed toothed ring (3) fixed to the top of the base (1), a mounting ring (4) rotatably connected to the top surface of the fixed toothed ring (3), and two mounting brackets (7) symmetrically fixed to the top surface of the mounting ring (4). The reaction tank (2) is located between the two mounting brackets (7), and each of the two mounting brackets (7) is rotatably connected to a rotating shaft (8). The two rotating shafts (8) are respectively fixed to the outer walls of the two sides of the reaction tank (2). The swaying mechanism includes a drive assembly mounted on the base (1) for driving the mounting ring (4) to reciprocate and rotate, and a transmission assembly mounted on the mounting bracket (7) for driving the rotating shaft (8) to rotate synchronously when the mounting ring (4) rotates; The top of the reaction vessel (2) is detachably fixed with a top cover (13). The stirring assembly includes a main stirring shaft (22) rotatably connected to the center of the top of the top cover (13), a mounting plate (26) fixed to the outer periphery of the main stirring shaft (22), a secondary stirring shaft (27) rotatably connected to the outer periphery of the mounting plate (26), and a linkage mechanism mounted on the mounting plate (26) for driving the secondary stirring shaft (27) to rotate synchronously when following the main stirring shaft (22) in revolution.

2. The high-temperature acid hydrolysis apparatus for nanocrystalline cellulose according to claim 1, characterized in that, The fixed toothed ring (3) and the mounting ring (4) are coaxially arranged, and both the fixed toothed ring (3) and the mounting ring (4) are incomplete toothed rings with a notch on one side. The arc length of the mounting ring (4) is smaller than the arc length of the fixed toothed ring (3).

3. The high-temperature acid hydrolysis apparatus for nanocrystalline cellulose according to claim 2, characterized in that, The fixed toothed ring (3) has a 5-10cm gap between its two ends and the two ends of the mounting ring (4).

4. The high-temperature acid hydrolysis apparatus for nanocrystalline cellulose according to claim 1, characterized in that, The drive assembly includes a fixed shaft (20) rotatably connected to the top of the base (1), a drive gear (6) and a transmission gear (21) sleeved on the outer periphery of the fixed shaft (20), and a power component installed on the top surface of the base (1) for driving the transmission gear (21) to rotate. The outer ring of the mounting ring (4) is fixed with a movable gear ring (19) coaxially arranged therewith, and the movable gear ring (19) meshes with the drive gear (6).

5. The high-temperature acid hydrolysis apparatus for nanocrystalline cellulose according to claim 4, characterized in that, The power component includes a telescopic component (17) mounted on the top surface of the base (1) and a transmission rack (18) fixed at the output end of the telescopic component (17), wherein the transmission rack (18) meshes with the transmission gear (21).

6. The high-temperature acid hydrolysis apparatus for nanocrystalline cellulose according to claim 1, characterized in that, The transmission assembly includes a transmission shaft (5) rotatably connected to the mounting bracket (7), a worm (10) fixed to the top of the transmission shaft (5), a connecting gear (16) fixed to the bottom of the transmission shaft (5), and a worm wheel (9) sleeved on the outer circumference of the rotating shaft (8). The worm wheel (9) meshes with the worm (10), and the connecting gear (16) meshes with the fixed gear ring (3).

7. The high-temperature acid hydrolysis apparatus for nanocrystalline cellulose according to claim 2, characterized in that, The top of the top cover (13) is equipped with a feed pipe (12), and the bottom of the reaction tank (2) is equipped with a discharge pipe (15). The discharge pipe (15) is located in the middle of the line connecting the two rotating shafts (8) and close to the bottom edge of the reaction tank (2). Valves are installed on both the feed pipe (12) and the discharge pipe (15).

8. The high-temperature acid hydrolysis apparatus for nanocrystalline cellulose according to claim 1, characterized in that, The inner ring of the reaction vessel (2) is equipped with a fixed gear ring (25) coaxially arranged with it. The linkage mechanism includes a linkage shaft (24) rotatably connected to the top surface of the mounting plate (26) along the radial direction of the reaction vessel (2), a linkage gear (23) fixed at one end of the linkage shaft (24), and a driving bevel gear (28) sleeved on the outer periphery of the linkage shaft (24). The linkage gear (23) is located on the top of the fixed gear ring (25) and meshes with it. The top of the auxiliary stirring shaft (27) extends to the top of the mounting plate (26) and is fixed with a driven bevel gear (29) meshing with the driving bevel gear (28).

9. The high-temperature acid hydrolysis apparatus for nanocrystalline cellulose according to claim 2, characterized in that, The driving bevel gear (28) is located on the side of the driven bevel gear (29) away from the main stirring shaft (22).

10. The high-temperature acid hydrolysis apparatus for nanocrystalline cellulose according to claim 1, characterized in that, The reaction vessel (2) and the top cover (13) are detachably fixed by fasteners. The fasteners include multiple fixing blocks (14) fixed on the top of the outer periphery of the reaction vessel (2) and corresponding fixing blocks (14) fixed on the bottom of the outer periphery of the top cover (13), and the two fixing blocks (14) are fixed together by bolts.

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