Cellulose ether reaction kettle with crushing mechanism

Abstract

The utility model relates to the technical field of reaction kettles, in particular to a cellulose ether reaction kettle with a crushing mechanism, which comprises a reaction kettle outer shell, and a stirring mechanism for stirring materials and the crushing mechanism for crushing the materials are arranged on the reaction kettle outer shell. The stirring mechanism comprises a stirring shaft and stirring blades; the stirring shaft extends into the reaction kettle outer shell from top to bottom; the stirring blades are mounted and connected on the stirring shaft; the crushing mechanism comprises a transmission shaft which extends into the reaction kettle outer shell from top to bottom and a crushing assembly which is connected to the lower end of the transmission shaft, is positioned below the stirring shaft and is positioned in the reaction kettle outer shell close to the bottom area, and the stirring effect is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of reaction vessel technology, and in particular to a cellulose ether reaction vessel with a pulverizing mechanism. Background Technology

[0002] The reaction vessel is the core equipment in cellulose ether production. Its basic structure consists of an outer shell, stirring shaft, stirring blades, power and transmission devices, etc. Reaction raw materials, including refined cotton, liquid alkali, and solvents, undergo alkalization and etherification reactions within the reaction vessel. Ideally, the material after this reaction should be a homogeneous slurry. However, due to objective factors such as material ratios and the degree of stirring, particles of varying sizes and irregular shapes will be produced during the reaction. These particles typically settle at the bottom of the reaction vessel.

[0003] The stirring device of a typical reaction vessel has limited dispersing capacity and cannot completely break down particulate materials, resulting in the production of "raw materials" during the reaction.

[0004] Existing technologies are typically improved in the following two ways:

[0005] First, increase the mixing time. By mixing for a longer period of time, the materials can be fully mixed. The mixing blades have a certain ability to break up the particles, and long-term mixing can reduce the formation of granular materials.

[0006] Secondly, to prevent these raw materials from entering the next production process, filters are usually added to the discharge pipeline of the reactor to remove them. Cleaning the filters requires a lot of manpower and also wastes a lot of raw materials.

[0007] At the time, the above method had a major problem: prolonged stirring wasted electricity, and the granular material would waste labor and raw materials if it entered the next process.

[0008] For example, Chinese Patent Application No. 202221048694.2 discloses a stirring transmission system suitable for large-scale high-viscosity media reactors. The system includes a reactor and a stirring mechanism located inside the reactor. The stirring mechanism includes a bearing seat installed at the bottom of the reactor interior. A vertically oriented rotating shaft is connected to the bearing seat. Multiple straight blades distributed from top to bottom and located inside the reactor are connected to the outer periphery of the rotating shaft. A plum blossom-shaped baffle with an arc-shaped surface is installed on the inner wall of the reactor. The plum blossom-shaped baffle does not contact the rotating shaft or the straight blades. A sealing seat is installed at the top of the reactor. The top of the rotating shaft extends through the reactor and above the sealing seat. A driving mechanism for driving the rotating shaft to rotate is provided on the reactor.

[0009] The reaction vessel involved in the aforementioned patented technology suffers from the aforementioned technical problems and needs to be improved. Utility Model Content

[0010] The purpose of this invention is to provide a cellulose ether reactor with a pulverizing mechanism that significantly improves the stirring effect.

[0011] The above-mentioned objective of this utility model is achieved through the following technical solution: a cellulose ether reactor with a pulverizing mechanism, comprising a reactor shell, wherein the reactor shell is provided with a stirring mechanism for stirring materials and a pulverizing mechanism for pulverizing materials, the stirring mechanism comprising a stirring shaft extending downward into the reactor shell and stirring blades mounted and connected on the stirring shaft, and the pulverizing mechanism comprising a drive shaft extending downward into the reactor shell and a pulverizing component connected at the lower end of the drive shaft, located below the stirring shaft and in the bottom region of the reactor shell.

[0012] As a preferred embodiment of this invention, the stirring shaft is a hollow shaft forming a cavity that extends vertically, and the drive shaft passes through the cavity inside the stirring shaft, with a gap between the drive shaft and the stirring shaft.

[0013] As a preferred embodiment of this utility model, a motor bracket is fixed to the top outer side of the reactor shell, and a stirring motor is mounted and fixed on the motor bracket. The stirring motor has a stirring motor shaft, and the lower end of the stirring motor shaft is fixedly connected to the upper end of the stirring shaft. The stirring motor shaft is also a hollow shaft. A transmission motor is mounted and fixed to the upper side of the motor shell of the stirring motor. The transmission motor has a transmission motor shaft, and the lower end of the transmission motor shaft is fixedly connected to the upper end of the transmission shaft. The transmission motor shaft and the transmission shaft are connected as a whole and pass through the whole formed by the stirring motor shaft and the transmission motor shaft, and the lower part of the transmission shaft is exposed at the bottom of the stirring shaft.

[0014] As a preferred embodiment of the present invention, the pulverizing assembly includes a pulverizing shell with a hollow interior forming a pulverizing cavity, a slurry inlet pipe and a slurry outlet pipe connected to the pulverizing shell, and a pulverizing moving blade disposed in the pulverizing cavity. The pulverizing moving blade includes a vertical moving blade shaft and moving blades fixed on the outer periphery of the moving blade shaft. The upper end of the moving blade shaft is fixedly connected to the lower end of the transmission shaft.

[0015] As a preferred embodiment of this invention, the connection between the slurry inlet pipe and the crushing shell is located below the crushing chamber, and the connection between the slurry outlet pipe and the crushing shell is located on the horizontal side of the crushing chamber.

[0016] As a preferred embodiment of this invention, the crushing shell is cylindrical, the crushing chamber is cylindrical, and the slurry inlet pipe includes an ascending feed section connected to the bottom center region of the crushing shell, a horizontal feed section connected to the bottom of the ascending feed section and extending horizontally to the left, and an inlet section with a forward opening connected to the end of the horizontal feed section away from the ascending feed section. The slurry outlet pipe includes a horizontal discharge section connected to the horizontal side of the crushing shell and extending horizontally to the right, and an outlet section with a forward opening connected to the end of the horizontal discharge section away from the crushing shell. The horizontal discharge section is further forward than the horizontal feed section, and the horizontal feed section and the horizontal discharge section are located on the left and right sides of the center line extending forward and backward of the crushing chamber, respectively.

[0017] As a preferred embodiment of this invention, the average diameter of the inlet section is greater than the average diameter of the outlet section, the inlet section is a forward-expanding conical shape, the outlet section is a forward-facing cylindrical shape, the opening of the inlet section is opposite to the direction of rotation of the stirring shaft, and the opening of the outlet section is in the direction of rotation of the stirring shaft.

[0018] As a preferred embodiment of this invention, stationary blades extending radially toward the center are fixed on the inner sidewall of the crushing shell at a position near the middle of the upper and lower parts, and the stationary blades are distributed in a circumferential array.

[0019] As a preferred embodiment of this utility model, the moving blade has two sets, upper and lower, each set having three moving blades at the same horizontal position, the stationary blade being located between the upper and lower sets of moving blades, the stationary blade being located around the moving blade shaft, each set having three blades arranged in a circumferential array, the moving blade being curved in a horizontal arc shape with the curvature direction following the direction of rotation of the stirring shaft.

[0020] As a preferred embodiment of this invention, a support frame is fixed between the outer periphery of the bottom of the crushing shell and the inner side of the bottom of the reactor shell.

[0021] The beneficial effects of this invention are: better stirring effect, more uniform stirring, and a significant reduction in particulate matter at the bottom of the reactor, resulting in a uniform slurry.

[0022] It has high mixing efficiency, saves labor and raw materials, and effectively controls production costs. Attached Figure Description

[0023] Figure 1 This is a front view of the reactor vessel after it has been cut open, as described in the embodiment.

[0024] Figure 2 for Figure 1 Enlarged view of point I in the middle;

[0025] Figure 3 for Figure 1 A bottom view;

[0026] Figure 4 for Figure 3 An enlarged view of the middle section. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings.

[0028] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of the present utility model.

[0029] Examples, such as Figure 1-4 As shown, a cellulose ether reactor with a pulverizing mechanism is characterized by comprising a reactor shell 1, on which a stirring mechanism for stirring materials and a pulverizing mechanism for pulverizing materials are provided. The stirring mechanism includes a stirring shaft 2 extending downward into the reactor shell 1 and stirring blades 21 mounted on the stirring shaft 2. The pulverizing mechanism includes a drive shaft 3 extending downward into the reactor shell 1 and a pulverizing component located below the stirring shaft 2 and in the bottom region of the reactor shell 1 connected to the lower end of the drive shaft 3. The reactor shell 1, stirring shaft 2, and stirring blades 21 can adopt existing structures. The feature of this application lies in the design of the pulverizing mechanism. During the reaction process, a lot of deposited particulate material will be present in the bottom region of the reactor shell 1. Existing technologies have many problems, such as long stirring time, insufficient energy saving, inability to completely remove particulate material, high labor costs, and waste of raw materials. This application utilizes a newly designed crushing mechanism to more effectively remove granular materials. Furthermore, the crushing components are positioned at the bottom region for more concentrated crushing of the granules, allowing them to be incorporated into the slurry and form a more uniform slurry. This design employs two shaft structures: a stirring shaft 2 and a drive shaft 3. The specific structural design is as follows.

[0030] The stirring shaft 2 is a hollow shaft forming a through-cavity 20. The drive shaft 3 passes through the cavity 20 and is installed inside the stirring shaft 2, with a gap between the drive shaft 3 and the stirring shaft 2. This nesting arrangement allows the two shafts to work together without interference, ensuring their rotation and coordinated operation. The specific power structure design is as follows:

[0031] A motor bracket 4 is fixed to the top outer side of the outer shell 1 of the reactor vessel. The motor bracket 4 can be an existing trapezoidal or conical three-dimensional bracket. A stirring motor 41 is mounted and fixed on the motor bracket 4. The stirring motor 41 has a stirring motor shaft, and the lower end of the stirring motor shaft is fixedly connected to the upper end of the stirring shaft 2, thus forming the power connection of the stirring shaft. For the purposes of this application, the stirring motor shaft of the stirring motor 41 is also designed as a hollow shaft, located at the center of the motor and running through the entire stirring motor from top to bottom. This is a structure with shafts extending from both the top and bottom of the motor, mainly for the integration of the transmission shaft 3 and the stirring shaft 2. A transmission motor 42 is mounted and fixed to the upper part of the motor shell of the stirring motor 41. The transmission motor 42 has a transmission motor shaft, and the lower end of the transmission motor shaft is fixedly connected to the upper end of the transmission shaft 3, which is the power connection of the transmission shaft. For the integration of the two shafts, the transmission motor shaft and the transmission shaft 3 are connected together and inserted into the integrated structure of the stirring motor shaft and the transmission motor shaft, forming a nested structure. A gap needs to be maintained between the two sets of shafts to avoid wear and other problems. Furthermore, the lower part of the drive shaft 3 protrudes from the bottom of the stirring shaft 2. This protrusion serves two purposes: firstly, to avoid interference between the stirring shaft and the crushing component; secondly, to facilitate easier installation and connection with the crushing component; and thirdly, to provide a certain rotational driving effect on the material below. One point that this application needs to optimize is the rotation speed. Conventional cellulose ether reactors operate at speeds between 50 and 500 rpm, with a faster speed generally chosen to reduce particulate matter. However, excessively high speeds have the following disadvantages: they can damage the material structure. For sensitive materials like cellulose ethers, excessively high stirring speeds may destroy their molecular structure, affecting product quality and performance. High-speed stirring increases friction between the stirrer and the material, and between the stirrer and the reactor wall, leading to accelerated equipment wear. This not only shortens the equipment's lifespan but may also increase maintenance costs. For example, components such as the stirrer blades are easily damaged under high-speed stirring and require frequent replacement. In this embodiment, a low stirring speed, such as 50 to 100 rpm, can be used. Therefore, the aforementioned disadvantages can be largely avoided. However, slower stirring speeds will result in a relatively larger amount of particulate matter. However, this problem can be effectively solved by the crushing mechanism, thus addressing both issues. The drive shaft 3 requires a high speed, generally above 500 rpm, but can be controlled at around 1000 rpm for crushing purposes. The crushing component itself is relatively small, making it easy to replace and maintain even if it breaks, resulting in low costs. Furthermore, the crushing component operates within a small area, minimizing impact. Its internal structure employs a special design that minimizes damage to the equipment and materials. Since it crushes the final particulate material from the reaction process, the chemical impact is minimal; the primary goal is to break it down into fine particles, essentially a physical change.

[0032] Preferably, the pulverizing assembly includes a pulverizing shell 5 with a hollow interior forming a pulverizing chamber 50, a slurry inlet pipe 51 and a slurry outlet pipe 52 connected to the pulverizing shell 5, and a pulverizing blade disposed within the pulverizing chamber 50. The pulverizing blade includes a vertical moving blade shaft 531 and moving blades 532 fixed on the outer periphery of the moving blade shaft 531. The upper end of the moving blade shaft 531 is fixedly connected to the lower end of the drive shaft 3. The volume of the pulverizing shell 5 is designed to be relatively small relative to the volume of the reactor outer shell 1. Preferably, the volume of the pulverizing shell 5 is less than one-fiftieth of the volume of the reactor outer shell 1, and is controlled to be between one-hundredth and one-hundred-fiftieth. The slurry inlet pipe 51 and the slurry outlet pipe 52 are for the finished material from the bottom of the reactor to enter. Then, the uneven slurry containing many aggregated particles is pulverized to make the overall slurry more uniform and without particles in the output. The pulverization of medium-sized particles in the material is accomplished by the pulverizing blade, with the moving blade 532 rotating in a horizontal plane to achieve pulverization. The main body of the moving blade shaft 531 is inside the crushing housing 5.

[0033] Furthermore, the connection between the slurry inlet pipe 51 and the crushing housing 5 is located below the crushing chamber 50, and the connection between the slurry outlet pipe 52 and the crushing housing 5 is located on the horizontal side of the crushing chamber 50. Therefore, the preferred feature here is that the material is fed from below to above the crushing housing 5, and the material is discharged from the upper side of the crushing housing 5, thus forming an inlet and outlet channel. That is, the interface connecting the slurry inlet pipe 51 and the crushing housing 5 is located lower, and the interface connecting the slurry outlet pipe 52 and the crushing housing 5 is located on the upper side.

[0034] Furthermore, the crushing shell 5 is a cylindrical box shape, the crushing chamber 50 is cylindrical, and the slurry inlet pipe 51 includes an ascending feed section 511 connected to the bottom center area of ​​the crushing shell 5, a horizontal feed section 512 connected to the bottom of the ascending feed section 511 and extending horizontally to the left, and an inlet section 513 with a forward opening connected to one end of the horizontal feed section 512 away from the ascending feed section 511. Both the crushing shell 5 and the slurry inlet pipe 51 can be made of metal, such as steel. The ascending feed section 511 can be cylindrical or nearly cylindrical, with its upper end connected to the bottom center area of ​​the crushing shell 5, its lower end connected to the right end of the horizontal feed section 512, and its left end connected to the rear end of the inlet section 513. The inlet section 513 extends forward and backward with its front opening serving as the material inlet. The slurry output pipe 52 includes a horizontal discharge section 521 that communicates with the horizontal side portion of the crushing housing 5 and extends horizontally to the right, and an outlet section 522 with a forward opening that is connected to the end of the horizontal discharge section 521 away from the crushing housing 5. The left end of the horizontal discharge section 521 is connected to the outer periphery of the horizontal side of the right half of the crushing housing 5, and the right end of the horizontal discharge section 521 is connected to the rear end of the outlet section 522. The outlet section 522 extends forward and backward and its front opening serves as the material outlet. That is, both the inlet and outlet face forward. The left-right and front-back relationships here are relative and are determined by observing from the perspective of the inlet section 513. Furthermore, the horizontal discharge section 521 is further forward than the horizontal inlet section 512, and the horizontal inlet section 512 and the horizontal discharge section 521 are located on the left and right sides of the center line extending forward and backward of the crushing chamber 50, respectively. The material enters the crushing housing 5 from bottom to top, and rotates while being crushed. Because the moving blade 532 is driven by the moving blade shaft 531 to rotate and crush, the horizontal discharge section 521 and the horizontal feed section 512 have a front-to-back position difference, which allows the material to be crushed for a longer time before being output, rather than being sent out immediately, resulting in higher crushing efficiency.

[0035] Preferably, the average diameter of the inlet section 513 is larger than the average diameter of the outlet section 522. The inlet section 513 is a forward-expanding conical shape, and the outlet section 522 is a forward-facing cylindrical shape. The design of the opening size is to ensure that the material inflow is greater than the outflow, so that the crushing shell 5, the slurry inlet pipe 51 and the slurry outlet pipe 52 are filled with material, and the material propulsion effect of a single channel is parallel. That is, the driving force formed by more material entering will make the material crushed and output better. To better achieve this crushing method, the following design is implemented: the opening of the inlet section 513 is opposite to the direction of rotation of the stirring shaft, while the opening of the outlet section 522 is in the direction of rotation of the stirring shaft. Since the stirring shaft rotates in the opposite direction, the material also flows in the opposite direction of the opening of the inlet section 513, meaning the material rushes towards the opening of the inlet section 513. This allows for better entry into the inlet section 513, followed by entry into the slurry inlet pipe 51 and then into the crushing shell 5. After crushing, the material is output from the outlet section 522. The opening of the outlet section 522 is in the direction of both stirring and material flow, allowing the output material to better integrate with the external material flow trend without causing obstruction. This design is highly compliant with fluid mechanics, forming a material input and output flow system in the connection of the slurry inlet pipe 51, the crushing shell 5, and the slurry outlet pipe 52, effectively crushing particulate matter in the slurry.

[0036] Furthermore, stationary blades 6 are fixed on the inner sidewall of the crushing housing 5, extending radially towards the center. These stationary blades 6 are arranged in a circumferential array. Both the stationary blades and the crushing housing 5 are stationary. The stationary blades 6 are straight, strip-shaped cutters distributed in four positions: front, back, left, and right. In other words, there are four stationary blades 6, all at the same horizontal position. Both sides of the stationary blade 6 in the horizontal circumferential direction can be cutting edges; for example, the left-side stationary blade 6 has cutting edges on both its front and back sides. Alternatively, both the top and bottom sides of the stationary blade 6 can be cutting edges, resulting in a rhomboid cross-section where the sharp corners at the top, bottom, front, and back are cutting edges. This method is more effective. Rectangular blades can also be used, in which case the cutting edges would be at the four corners: front upper, rear upper, front lower, and rear lower.

[0037] Furthermore, the moving blades 532 are arranged in two groups, upper and lower, with three blades in each group positioned at the same horizontal level. The stationary blades 6 are located between the two groups of moving blades 532, surrounding the moving blade shaft 531. Each group of moving blades 532 has three blades arranged in a circular array on the horizontal plane. The moving blades 532 are curved in a horizontal arc shape, with the curvature aligned with the direction of rotation of the stirring shaft. Preferably, the rotation direction of the stirring shaft is the same as that of the moving blade shaft 531. For example, if the stirring shaft rotates counterclockwise, the moving blades 532 bend counterclockwise starting from the moving blade shaft 531. This design allows the material to enter the crushing housing 5 from bottom to top, with the curved and concave side of the moving blades 532 shearing and crushing the material, working in conjunction with the stationary blades for better crushing. Furthermore, the overall diameter of the rising feed section 511 can be set smaller, approximately the same as the diameter of the moving blade shaft 531. In particular, the size of the connection between the upper end of the rising feed section 511 and the crushing housing 5 is preferably less than one-quarter the diameter of the crushing chamber 50, ideally around one-seventh. This has the advantage that the incoming material impacts less of the blade area, primarily impacting the area of ​​the moving blade shaft 531, causing almost no damage to the blades. The impact is essentially vertical, with minimal influence. If the material is fed from the side, the situation is different. Firstly, the material's wrapping and cutting effect is not as good. Secondly, the material impacts the curved, arched side of the moving blade 532, significantly affecting the blades. It also obstructs the feeding and conveying process, resulting in poor crushing and hindering the formation of negative pressure, preventing proper material intake and output. Additionally, a certain gap should be maintained between the lower set of moving blades 532 and the bottom of the crushing housing 5 to facilitate material upward movement and shearing. Furthermore, the distances between the top of the crushing housing 5 and the upper set of moving blades 532, the distances between the upper set of moving blades 532 and the stationary blades 6, the distances between the stationary blades 6 and the lower set of moving blades 532, and the distances between the lower set of moving blades 532 and the bottom of the crushing housing 5 should be kept as consistent as possible, ideally with a difference of no more than double between each. Additionally, although the moving blades 532 are curved, their cross-section can still be rhomboid. This is observed from a horizontal perspective; that is, the top and bottom, as well as the curved concave and convex sides, are all cutting edges.

[0038] Through the above design, the particulate material deposited near the bottom of the reactor is drawn into the crushing component along with the slurry material by the rotation of the agitator and the self-priming ability of the crushing component itself. The crushing component crushes the particulate material and then discharges it back into the reactor along with the slurry material.

[0039] Preferably, a support frame 11 is fixed between the outer periphery of the bottom of the crushing shell 5 and the inner side of the bottom of the reactor shell 1. The support frame 11 can be an existing trapezoidal steel bracket or a support structure composed of multiple diagonal support rods, etc., as long as the stability of the crushing shell 5 is ensured. A detachable fixing method is preferred for easy replacement and maintenance.

[0040] The portion of the drive shaft 3 exposed above the stirring shaft 2, as mentioned above, is for connection to the pulverizing assembly, specifically for fixed connection to the moving blade shaft 531. The lower section of this exposed portion of the drive shaft 3 is an inverted frustum-shaped cone and is used for fixed connection to the upper end of the moving blade shaft 531. The drive shaft 3 is generally cylindrical, but this lower section is preferably an inverted frustum-shaped cone. Especially at high speeds, the axial load on the drive shaft generates a large radial torque and a small tangential torque, which the tapered connection can withstand. The tapered connection provides excellent positional accuracy and synchronization, which greatly helps in motor operation stability, reducing power consumption and noise. Furthermore, the tapered connection, while distributing axial and radial loads more evenly, also improves the torque and power transmission capacity of the transmission.

[0041] In addition, during the design of the crushing assembly, the upper end of the moving blade shaft 531 is designed to extend beyond the top of the crushing housing 5 for easy fixation to the drive shaft 3. The crushing housing 5 can be designed as a split structure, for example, consisting of a top cover and a semi-enclosed housing with an upper opening. A sealed bearing can be nested and fixed on the top cover. The moving blade shaft 531 is suspended and connected in the sealed bearing, with a portion of its upper end protruding upwards from the top cover. The moving blade can be pre-fixed to the moving blade shaft 531 using existing methods. Then, the protruding portion of the moving blade shaft 531 and the tapered portion of the drive shaft 3 are fixedly connected using existing methods. Then, the semi-enclosed housing and the top cover are installed and fixed at the outer periphery to form the complete crushing housing 5. For further stability, the bottom of the semi-enclosed housing is fixedly connected to the bottom of the reactor via a support frame 11. Of course, other installation structures and sequences can be used to achieve this.

[0042] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A cellulose ether reaction vessel with a pulverizing mechanism, characterized in that, The reactor includes a reactor shell (1), on which a stirring mechanism for stirring materials and a crushing mechanism for crushing materials are provided. The stirring mechanism includes a stirring shaft (2) extending downward into the reactor shell (1) and stirring blades (21) mounted on the stirring shaft (2). The crushing mechanism includes a drive shaft (3) extending downward into the reactor shell (1) and a drive shaft (3) connected at its lower end to a component located below the stirring shaft (2) and within the reactor shell (1). The crushing assembly is located near the bottom of the crushing chamber. The crushing assembly includes a crushing shell (5) that forms a crushing cavity (50) with a hollow interior, a slurry inlet pipe (51) and a slurry outlet pipe (52) connected to the crushing shell (5), and a crushing moving blade disposed in the crushing cavity (50). The crushing moving blade includes a vertical moving blade shaft (531) and moving blades (532) fixed on the outer periphery of the moving blade shaft (531). The upper end of the moving blade shaft (531) is fixedly connected to the lower end of the transmission shaft (3).

2. The cellulose ether reactor with a pulverizing mechanism according to claim 1, characterized in that, The stirring shaft (2) is a hollow shaft and forms a cavity (20) that runs through the top and bottom. The drive shaft (3) passes through the cavity (20) and is installed inside the stirring shaft (2), with a gap between the drive shaft (3) and the stirring shaft (2).

3. A cellulose ether reactor with a pulverizing mechanism according to claim 2, characterized in that, A motor bracket (4) is fixed on the top outer side of the outer shell (1) of the reactor vessel. A stirring motor (41) is installed and fixed on the motor bracket (4). The stirring motor (41) has a stirring motor shaft and the lower end of the stirring motor shaft is fixedly connected to the upper end of the stirring shaft (2). The stirring motor shaft of the stirring motor (41) is also a hollow shaft. A transmission motor (42) is installed and fixed on the upper side of the motor shell of the stirring motor (41). The transmission motor (42) has a transmission motor shaft and the lower end of the transmission motor shaft is fixedly connected to the upper end of the transmission shaft (3). The transmission motor shaft and the transmission shaft (3) are connected together and pass through the whole of the stirring motor shaft and the transmission motor shaft. The lower part of the transmission shaft (3) is exposed at the bottom of the stirring shaft (2).

4. A cellulose ether reactor with a pulverizing mechanism according to claim 3, characterized in that, The slurry inlet pipe (51) is connected to the crushing shell (5) at the bottom of the crushing chamber (50), and the slurry outlet pipe (52) is connected to the crushing shell (5) at the horizontal side of the crushing chamber (50).

5. A cellulose ether reactor with a pulverizing mechanism according to claim 4, characterized in that, The crushing shell (5) is cylindrical, the crushing chamber (50) is cylindrical, and the slurry inlet pipe (51) includes an ascending feed section (511) connected to the bottom center area of ​​the crushing shell (5), a horizontal feed section (512) connected to the bottom of the ascending feed section (511) and extending horizontally to the left, and an inlet section (513) with a forward opening connected to the end of the horizontal feed section (512) away from the ascending feed section (511). The slurry outlet pipe (52) includes a horizontal discharge section (521) that communicates with the horizontal side portion of the crushing shell (5) and extends horizontally to the right, and an outlet section (522) that opens forward and is connected to the end of the horizontal discharge section (521) away from the crushing shell (5). The horizontal discharge section (521) is further forward than the horizontal feed section (512), and the horizontal feed section (512) and the horizontal discharge section (521) are located on the left and right sides of the center line extending forward and backward of the crushing chamber (50), respectively.

6. A cellulose ether reactor with a pulverizing mechanism according to claim 5, characterized in that, The average diameter of the inlet section (513) is greater than the average diameter of the outlet section (522). The inlet section (513) is a forward-expanding conical shape, and the outlet section (522) is a forward-expanding cylindrical shape. The opening of the inlet section (513) is opposite to the direction of rotation of the stirring shaft, and the opening of the outlet section (522) is in the direction of rotation of the stirring shaft.

7. A cellulose ether reactor with a pulverizing mechanism according to claim 6, characterized in that, The internal sidewall of the crushing shell (5) is fixed with stationary blades (6) extending radially towards the center. The stationary blades (6) are arranged in a circumferential array.

8. A cellulose ether reactor with a pulverizing mechanism according to claim 7, characterized in that, The moving blade (532) has two sets, upper and lower, with three blades in each set and positioned at the same horizontal level. The stationary blade (6) is located between the two sets of moving blades (532) and is positioned around the moving blade shaft (531). Each set of moving blades (532) has three blades arranged in a circumferential array. The moving blades (532) are curved in a horizontal arc shape and the curvature direction follows the direction of rotation of the stirring shaft.

9. A cellulose ether reactor with a pulverizing mechanism according to claim 8, characterized in that, A support frame (11) is fixed between the outer periphery of the bottom of the crushing shell (5) and the inner side of the bottom of the reactor shell (1).

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