An inner-toothed ring guide cover and a super-micro pulverizer using the same

Abstract

The application provides an inner ring gear guide cover and an ultrafine pulverizer using the guide cover, and relates to an ultrafine pulverizing structure, which comprises a guide cover inner ring plate, a guide cover outer ring plate and a guide cover rib plate. The guide cover outer ring plate is coaxially arranged with the guide cover inner ring plate. The inner ring gear is arranged on the inner side of the guide cover outer ring plate and has the same axial extension height as the guide cover outer ring plate. The guide cover rib plate is provided with multiple groups and is distributed in a ring shape between the guide cover inner ring plate and the guide cover outer ring plate. The application adds an inner ring gear on the inner wall of the guide cover outer cavity. The inner ring gear is different from the pulverizing tooth ring used for cooperating with the hammer head. The inner ring gear is located above the pulverizing tooth ring. The main purpose is to utilize the kinetic energy of the residual material after leaving the pulverizing area. The inner ring gear can not only have the effect of further pulverizing, but also has the effect of guiding the flow. The inner ring gear is beneficial to the material leaving the ring flow overflow cavity and breaking the stratification of the material caused by the centrifugal force, and is beneficial to the material being better classified and screened.

Description

Technical Field

[0001] This invention relates to an ultrafine pulverizing structure, and more particularly to a flow guide shroud with an internal toothed ring and an ultrafine pulverizer using the flow guide shroud. Background Technology

[0002] In the feed processing and manufacturing industry, because the digestive system of aquatic animals is relatively simple, it is necessary to produce their feed through ultra-fine grinding to obtain feed with a particle size of 80 mesh or higher. Ultra-fine grinding can not only improve the mixing uniformity of aquatic feed, facilitate the absorption of pre-conditioning water and heat, reduce the wear of extrusion presses, and give pelleted feed good stability in water, but also greatly improve the digestibility and absorption of feed in aquatic animals, increase feed efficiency, and reduce pollution of aquatic water bodies.

[0003] Currently, the existing structure and pulverizing process of ultrafine pulverizers are generally as follows: the material to be pulverized enters the ultrafine pulverizer through the feed inlet and falls onto a high-speed rotating disc. Hammers arranged in a circular array are installed along the edge of the high-speed rotating disc. Corresponding to the hammers are pulverizing toothed rings installed on the inner wall of the pulverizer cylinder. The hammers strike the material at high speed, breaking it down. The material is driven by the hammers to move at high speed and, under the action of centrifugal force, strikes the pulverizing toothed rings, achieving secondary and multiple pulverization of the material. The area corresponding to the hammers and the pulverizing toothed rings is the main pulverizing zone. The core of pulverization here is utilizing the impact between the hammers and the material, as well as the kneading action between the hammers and the pulverizing toothed rings. The impact with the hammers and the pulverizing action... The reaction force of the toothed ring is dominant. Therefore, given that the known crushing zone is only within the height range of the hammer, and that the feed particles will be carried away by the rising airflow beyond a certain height of the hammer, the interaction between the feed particles and the crushing toothed ring is significantly reduced, the height of the crushing toothed ring does not need to be set too high. This is a common understanding among those skilled in the art. In addition, considering the structural factor that a guide shroud needs to be set above the large plate, and that both the crushing toothed ring and the hammer need to be inlaid with wear-resistant materials such as hard alloy and high-speed steel (which are expensive) to avoid the problem of too fast wear and too short service life during crushing, the height of the crushing toothed ring will not be set too high. This is a limitation of the structure, as well as a limitation of cost and understanding.

[0004] For example, the patented double-toothed ring type ultrafine pulverizer (publication number CN209020487U) discloses that a pad is provided on the lower side of the outer toothed ring and a liner is provided on the upper side; by setting pads of different heights, the position of the outer toothed ring relative to the hammer can be adjusted to achieve the optimal matching position between the hammer and the outer toothed ring, thereby improving pulverization efficiency. Although the outer toothed ring is designed to be height-adjustable relative to the hammer, the purpose of this design is still to cooperate with the hammer to achieve the goal of improving pulverization efficiency. That is, no matter how the outer toothed ring is adjusted... All of them are located in the crushing zone corresponding to the hammer. As mentioned above, this crushing zone also uses the impact between the hammer and the material, as well as the kneading action between the hammer and the crushing tooth ring, to achieve the purpose of crushing. In addition, the method of adjusting the assembly position by using pads and liners is becoming less and less common with the improvement of manufacturing level, because it will increase costs and reduce assembly efficiency. Moreover, the liner in the above patent is difficult to process because it is large in size and has low rigidity. In addition, the height dimension can only be determined during assembly, which also greatly reduces the assembly efficiency.

[0005] Regarding the ultrafine pulverizer with the aforementioned existing technical structure, we studied the movement trajectory of the material in the outer cavity of the guide shroud and the movement trajectory of the material in the circulating overflow cavity. We found that inside the ultrafine pulverizer, after the material and airflow enter the inner cavity of the guide shroud from the pulverizing zone through the outer cavity and the circulating overflow cavity, they still have a high rotational speed. However, because the material is not further pulverized, its kinetic energy is wasted. This excess kinetic energy also leads to the following problems: 1. In the outer cavity of the guide shroud, under the action of centrifugal force, the material will move at high speed close to the outer inner wall of the guide shroud, and the larger the mass of the particles, the closer they are to the outer inner wall of the guide shroud, which will cause the machine to... 1. After running for a certain period of time, the outer inner wall of the outer cavity of the guide shroud is severely worn or even worn through; 2. Some materials will directly enter the circulating overflow cavity from the crushing zone without any obstruction. Due to the high rotation speed, it will not be easy for them to detach from the circulating overflow cavity and enter the inner cavity of the guide shroud, which will also reduce the production efficiency of the ultrafine pulverizer; 3. Some materials will bounce back after high-speed impact in the outer cavity of the guide shroud, which will also accelerate the wear of the outer cavity structure of the guide shroud; 4. After large particles of material with high-speed rotation enter the circulating overflow cavity, they will move closely against the inner wall of the top cover of the circulating overflow cavity. After being rushed out of the circulating overflow cavity, they will directly impact the root of the classifier wheel, which will also lead to rapid wear of the root of the classifier wheel. Summary of the Invention

[0006] To address the aforementioned technical problems, the present invention aims to provide a guide shroud with an internal toothed ring and an ultrafine pulverizer using the guide shroud. An internal toothed ring is added to the inner wall of the outer cavity of the guide shroud. This internal toothed ring is different from the crushing toothed ring used to cooperate with the hammer. It is located above the crushing toothed ring and is mainly used to utilize the residual kinetic energy of the material after it leaves the crushing zone. This not only achieves a further crushing effect but also has a guiding function, which helps the material to escape from the circulating overflow cavity and breaks down the stratification of the material caused by centrifugal force, thus facilitating better classification and screening of the material.

[0007] This invention provides the following technical solution:

[0008] A guide shroud with an internal toothed ring and an ultrafine pulverizer using the guide shroud are disclosed. Located above a rotating large disk, the guide shroud forms the outer and inner cavities of the ultrafine pulverizer. It includes an inner ring plate, an outer ring plate, and ribs. The outer ring plate is fitted over the inner ring plate and is coaxially arranged with it. The internal toothed ring is arranged inside the outer ring plate and has the same axial extension height as the outer ring plate. It is installed together with the outer ring plate onto the inner wall of the pulverizer cylinder using screws. At this time, the inner cavity of the guide shroud is formed within the inner ring plate, and the outer cavity is formed between the outer and inner ring plates. Due to the internal... The toothed ring and the outer ring plate of the flow guide are installed to the inner wall of the crusher cylinder by screws. Therefore, it is convenient to disassemble and maintain. At the same time, it can also better avoid the material directly impacting and abrading the inner wall of the cylinder during crushing, and prevent the cylinder from being worn through. There are multiple sets of flow guide ribs, which are distributed circumferentially between the inner ring plate and the outer ring plate of the flow guide, and are used to connect and fix the inner ring plate and the outer ring plate of the flow guide. The setting of the flow guide ribs can also disrupt the material circulation to a certain extent. By positioning the outer ring plate and the inner ring plate of the flow guide, it is also convenient to install and disassemble the overall structure and ensure the relative installation position of the flow guide.

[0009] The newly added internal toothed ring on the inner side of the outer ring plate of the flow guide is different from the crushing toothed ring in the crushing zone that cooperates with the hammers on the large disc. Its main purpose is to utilize the residual kinetic energy of the material after it leaves the crushing zone. This not only further crushes the material but also guides its flow, facilitating its escape from the overflow chamber and breaking down the stratification caused by centrifugal force. This allows for better classification and screening of the material. Specifically:

[0010] A reserved opening is provided on the outer ring plate of the air guide hood to connect with the feed inlet. After the material enters the outer cavity of the air guide hood through this reserved opening, it moves at high speed close to the inner side of the outer ring plate of the air guide hood. The rotating airflow also continuously accelerates the material, which still has high kinetic energy. After the inner toothed ring is installed on the inner side of the outer ring plate of the air guide hood, the material repeatedly impacts the newly added toothed ring at high speed, further crushing large particles and thus improving the crushing effect.

[0011] Larger particles experience greater centrifugal force, so they will move closely against the newly added inner toothed ring. The speed of the horizontal rotation of the inner toothed ring will be zero, and then it will move rapidly upward along the groove of the inner toothed ring, thereby greatly reducing the impact of large particles on the guide shield ribs.

[0012] When the material detaches from the newly added inner toothed ring in the outer cavity of the guide shroud, the horizontal rotational speed is almost zero, thus eliminating the phenomenon of material stratification due to rotational motion. After the material enters the circulating overflow cavity, it is easily dispersed by the airflow and then sucked into the inner cavity of the guide shroud by negative pressure.

[0013] After the material enters the inner cavity of the guide hood, it is carried by the rotating airflow into the rotating motion area of ​​the classifying wheel. Since the material has been further crushed and better dispersed, the wear of the classifying wheel is smaller and more uniform, and the proportion of powder in the material is higher. Therefore, more material can be screened by the classifying wheel and discharged, which directly improves the productivity of the ultrafine pulverizer. The higher proportion of powder in the material means that less material is screened out by the classifying wheel and returned to the crushing area for secondary crushing, thereby reducing the impact on the crushing effect of new material and improving the crushing efficiency.

[0014] In summary, installing an internal gear ring on the inner side of the outer ring plate of the flow guide can effectively utilize the kinetic energy of the material to improve the crushing effect, increase the screening efficiency of the classifying wheel, and improve the production efficiency of the ultrafine pulverizer. It can also effectively reduce the wear of the material on the outer ring plate, the flow guide rib plate, and the classifying wheel, reduce the wear of vulnerable parts, and thus reduce the downtime and operating costs for replacing vulnerable parts.

[0015] Preferably, the surface of the guide shield rib can be vertically arranged along the axial direction, such as... Figure 7 As shown, vertical guide shield ribs are inserted, which can control and reduce the speed of air circulation.

[0016] Preferably, the surface of the guide shield rib can be arranged at an angle. In this case, the angled arrangement of the guide shield rib has less impact on the air circulation in the outer cavity of the guide shield, and the air circulation speed in the circulation overflow cavity is higher. The material dispersed in the circulation overflow cavity can obtain a higher rotation speed after reaching the inner cavity of the guide shield.

[0017] Preferably, the internal gear ring is made of white cast iron or wear-resistant steel, and does not require the use of expensive materials such as hard alloy or high-speed steel as in crushing gear rings, so the cost is much lower than that of crushing gear rings in terms of material and processing costs.

[0018] Preferably, the tooth shape of the internal gear ring is different from that of the crushing gear ring. In this case, it is not necessary to limit it to having the same tooth shape structure as the crushing gear ring, and the same effect can still be achieved, thus providing greater flexibility.

[0019] An ultrafine pulverizer uses the aforementioned guide shroud with an internal toothed ring.

[0020] Preferably, the device further includes a crushing toothed ring and a hammer assembly located in the crushing zone. The crushing toothed ring is installed on the inner wall of the crusher cylinder. The hammer assembly includes lower hammers arranged in a circumferential array on the edge of a high-speed rotating disc, a circular ring plate pressed against the upper layer of the lower hammers, and upper hammers positioned above the circular ring plate and corresponding to the lower hammers. The upper hammers, lower hammers, and circular ring plate are fastened to the high-speed disc with screws. The fastening and stress state of the upper hammers is the same as that of the single-layer hammers located on the disc in the prior art. They are pressed against the circular ring plate with screws, and the static friction between the circular ring plate and the upper hammers resists the centrifugal force generated by high-speed rotation. The lower hammers are pressed between the high-speed rotating disc and the circular ring plate, and the two static pressures provided by the lower hammers, the disc, and the circular ring plate resist the centrifugal force generated by high-speed rotation. Since both the upper and lower surfaces of the lower hammers are pressed and fixed, their height can be twice the height of the upper hammers.

[0021] The beneficial effects of this invention are:

[0022] 1. The guide hood of the present invention is used to form the outer cavity and inner cavity of the guide hood of the ultrafine pulverizer. An inner toothed ring is added to the inner wall of the outer cavity of the guide hood. The inner toothed ring is different from the crushing toothed ring used to cooperate with the hammer. It is located above the crushing toothed ring. It is mainly to utilize the residual kinetic energy of the material after leaving the crushing zone. It can not only play a further crushing role, but also has a guiding role. It is conducive to the material leaving the circulating overflow cavity and to destroy the stratification of the material caused by centrifugal force. It is conducive to the material being better classified and screened. When the material can leave the circulating overflow cavity as soon as possible, it can be crushed and discharged as soon as possible, so as to improve the crushing efficiency.

[0023] 2. The inner ring plate of the guide shroud is connected to the outer ring plate of the guide shroud through the guide shroud stiffener. Specifically, the connection can be made by welding. Therefore, the guide shroud stiffener can also play a role in disrupting the material circulation to a certain extent. The guide shroud and the newly added inner toothed ring are installed on the inner wall of the crusher cylinder with screws. Therefore, the overall structure is relatively easy to install and can ensure the relative installation position of the guide shroud.

[0024] 3. The newly added internal gear ring can be made of materials such as white cast iron and wear-resistant steel. It does not need to be inlaid with expensive materials such as hard alloy and high-speed steel as the crushing gear ring. Therefore, the cost will be much lower than the material and processing cost of the crushing gear ring. It is recommended that the tooth shape of the newly added internal gear ring be the same as that of the crushing gear ring, but it can also be different, so as to provide more flexibility.

[0025] 4. The high-speed rotation of the large disc generates a high-speed rotating airflow at the hammer and crushing tooth ring. This airflow, combined with the rising airflow, creates a spiraling cyclone. The centrifugal force of the particles (including gas molecules) in the rotating airflow is proportional to their mass. Therefore, larger particles adhere to the crushing tooth ring and the newly added inner tooth ring, while smaller gas molecules spiral upwards slightly away from them. The centrifugal force is proportional to the square of the rotational speed. The newly added inner tooth ring reduces the material's rotational speed to zero (centrifugal force reduced to zero), while the air cyclone remains unaffected by the inner tooth ring, maintaining a certain rotational speed (centrifugal force not zero). This also helps to break down the stratification of material and air caused by rotational motion (heavier particles initially approach the cylinder wall), which is beneficial for… The negative pressure at the discharge port draws the material into the classifying wheel; and after the feed particles enter the blade area of ​​the classifying wheel, they will be accelerated again by the classifying wheel to the same rotational speed as the classifying wheel. If the circulating overflow cavity maintains a certain rotating airflow, the feed particles will be accelerated by the rotating airflow before entering the classifying wheel area. This helps to reduce the load on the classifying wheel motor. The guide shroud ribs disrupt the rotating airflow. By changing the installation angle of the guide shroud ribs, the rotating airflow in the circulating overflow cavity can also be changed. That is, the guide shroud ribs can be arranged vertically or inclined. When the guide shroud ribs are inclined, the impact on the air circulation in the outer cavity of the guide shroud is smaller, and the air circulation speed in the circulating overflow cavity is higher. The material dispersed in the circulating overflow cavity can obtain a higher rotational speed after reaching the inner cavity of the guide shroud. Attached Figure Description

[0026] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0027] Figure 1 This is a schematic diagram of the structure of the air guide shield of the present invention;

[0028] Figure 2 yes Figure 1 The main view;

[0029] Figure 3 It is along Figure 2 A cross-sectional view along line AA in the middle;

[0030] Figure 4 This is a partial cross-sectional view of the functional structure of the flow guide shroud of the present invention used in an ultrafine pulverizer;

[0031] Figure 5 This refers to the movement trajectory of materials within the outer cavity of the flow guide in existing technologies;

[0032] Figure 6 This is the trajectory of material movement in the circulating overflow cavity in existing technology;

[0033] Figure 7 This is a schematic diagram of the hammerhead assembly in Example 2;

[0034] The markings in the diagram are as follows: 11 is the inner ring plate of the flow guide, 12 is the outer ring plate of the flow guide, 13 is the rib plate of the flow guide, 14 is the inner gear ring, 10 is the crusher cylinder, 20 is the large disc, 30 is the classifier wheel, 40 is the discharge port, 50 is the lower air chamber, 60 is the crushing zone, 70 is the outer cavity of the flow guide, 80 is the inner cavity of the flow guide, 90 is the circulating overflow chamber, 100 is the top cover, 21 is the crushing gear ring, 22 is the hammer assembly, 221 is the lower hammer, 222 is the upper hammer, and 223 is the circular ring plate. Detailed Implementation

[0035] Example 1

[0036] like Figure 1-6 The guide shroud with an internal gear ring shown in this embodiment is located above the rotating large disk 20 and is used to form the outer cavity 70 and inner cavity 80 of the guide shroud for the ultrafine pulverizer. It includes an inner ring plate 11, an outer ring plate 12, and a guide shroud rib 13. The outer ring plate 12 is sleeved on the outer ring plate 11 and is coaxial with the inner ring plate 11. The internal gear ring 14 is arranged inside the outer ring plate 12 and has the same axial extension height as the outer ring plate 12. It is installed together with the outer ring plate 12 on the inner wall of the pulverizer cylinder 10 by screws. At this time, the inner cavity 80 of the guide shroud is formed inside the inner ring plate 11, and the outer cavity of the guide shroud is formed between the outer ring plate 12 and the inner ring plate 11. 70. Since the inner gear ring 14 and the outer ring plate 12 of the flow guide are installed on the inner wall of the crusher cylinder 10 by screws, the operation is more convenient when disassembly and maintenance are required. At the same time, it can also better avoid the material directly impacting and abrading the inner wall of the cylinder during crushing, and prevent the cylinder from being worn through. The flow guide rib plate 13 is provided in multiple sets and is distributed circumferentially between the inner ring plate 11 and the outer ring plate 12 of the flow guide, and is used to connect and fix the inner ring plate 11 and the outer ring plate 12 of the flow guide. The setting of the flow guide rib plate 13 can also play a role in disrupting the material circulation to a certain extent. Furthermore, by positioning the outer ring plate 12 and the inner ring plate 11 of the flow guide, it is also convenient to install and disassemble the overall structure and ensure the relative installation position of the flow guide.

[0037] The newly added internal toothed ring 14 on the inner side of the outer ring plate 12 of the guide shroud is different from the crushing toothed ring 21 in the crushing zone 60 that is used to cooperate with the hammer on the large disc 20. It is mainly to utilize the residual kinetic energy of the material after leaving the crushing zone 60, which not only has the effect of further crushing, but also has the function of guiding the flow, which is conducive to the material leaving the circulating overflow cavity 90, and to breaking the stratification of the material caused by centrifugal force, which is conducive to the better classification and screening of the material. Specifically:

[0038] A reserved opening is provided on the outer ring plate of the air guide shroud to connect with the feed inlet. After the material enters the outer cavity 70 of the air guide shroud through this reserved opening, it moves at high speed close to the inner side of the outer ring plate 12 of the air guide shroud. The rotating airflow also continuously accelerates the material, which still has high kinetic energy. After the inner toothed ring 14 is installed on the inner side of the outer ring plate 12 of the air guide shroud, the material repeatedly impacts the newly added toothed ring at high speed, further crushing large particles of material, thereby improving the crushing effect.

[0039] Larger particles experience greater centrifugal force, so they will move closely against the newly added inner toothed ring 14. The speed of the horizontal rotation of the inner toothed ring 14 will be zero, and then it will move rapidly upward along the groove of the inner toothed ring 14, thereby greatly reducing the impact of large particles on the guide shield rib plate 13.

[0040] When the material detaches from the newly added inner toothed ring 14 in the outer cavity 70 of the guide shroud, the horizontal rotation speed is almost zero, thus eliminating the phenomenon of material stratification due to rotation. After the material enters the circulating overflow cavity 90, it is easily dispersed by the airflow and then sucked into the inner cavity 80 of the guide shroud by negative pressure.

[0041] After the material enters the inner cavity 80 of the guide hood, it is carried by the rotating airflow into the rotating motion area of ​​the classifying wheel 30. Since the material has been further crushed and better dispersed, the wear of the classifying wheel 30 is smaller and more uniform, and the proportion of powder in the material is higher. Therefore, more material can be screened by the classifying wheel 30 and discharged, which directly improves the productivity of the ultrafine pulverizer. The higher proportion of powder in the material means that less material is screened out by the classifying wheel 30 and returned to the crushing zone 60 for secondary crushing, thereby reducing the impact on the crushing effect of new material and improving the crushing efficiency.

[0042] In summary, installing the internal gear ring 14 inside the outer ring plate 12 of the flow guide can effectively utilize the kinetic energy of the material to improve the crushing effect, increase the screening efficiency of the classifying wheel 30, and improve the production efficiency of the ultrafine pulverizer. It can also effectively reduce the wear of the material on the outer ring plate 12, the flow guide rib plate 13, and the classifying wheel 30, reduce the wear of vulnerable parts, and thus reduce the downtime and operating costs for replacing vulnerable parts.

[0043] The surface of the guide shield rib 13 can be vertically arranged along the axial direction, such as... Figure 7As shown, a vertical guide shield rib 13 is inserted, which can control and reduce the speed of air circulation.

[0044] The surface of the guide shroud rib plate 13 can be arranged at an angle. When the guide shroud rib plate 13 is arranged at an angle, it has less impact on the air circulation in the outer cavity 70 of the guide shroud. The air circulation speed in the circulation overflow cavity 90 is higher, and the material dispersed in the circulation overflow cavity 90 can obtain a higher rotation speed after reaching the inner cavity 80 of the guide shroud.

[0045] The internal gear ring 14 is made of white cast iron or wear-resistant steel, and does not require expensive materials such as hard alloy or high-speed steel to be inlaid as in the crushing gear ring 21. Therefore, the cost is much lower than that of the crushing gear ring 21 in terms of material and processing costs.

[0046] The tooth shape of the inner tooth ring 14 is different from that of the crushing tooth ring 21. Therefore, it is not necessary to limit it to having the same tooth shape structure as the crushing tooth ring 21, and the same effect can still be achieved, thus providing greater flexibility.

[0047] Example 2

[0048] like Figure 1-7 The ultrafine pulverizer shown uses a guide shroud with an internal toothed ring as described in Embodiment 1. Based on Embodiment 1, it further includes a pulverizing toothed ring 21 and a hammer assembly 22 located in the pulverizing zone 60. The pulverizing toothed ring 21 is installed on the inner wall of the pulverizer cylinder 10. The hammer assembly 22 includes lower hammers 221 arranged in a circumferential array on the edge of a high-speed rotating large disc 20, a circular ring plate 223 pressed against the upper layer of the lower hammers 221, and upper hammers 222 positioned above the circular ring plate 223 and corresponding one-to-one with the lower hammers 221. The upper hammers 222, lower hammers 221, and circular ring plate 223 are fastened to the high-speed rotating disc 20 by screws. On the large disc 20, the upper hammer head 222 is fastened and stressed in the same way as the single-layer hammer head on the large disc 20 in the prior art. It is pressed onto the ring plate 223 by screws. The static friction between the ring plate 223 and the upper hammer head 222 resists the centrifugal force generated by high-speed rotation. The lower hammer head 221 is pressed between the high-speed rotating large disc 20 and the ring plate 223. The two static pressures provided by the lower hammer head 221, the large disc 20, and the ring plate 223 resist the centrifugal force generated by high-speed rotation. Since both the upper and lower surfaces of the lower hammer head 221 are pressed and fixed, its height can be twice the height of the upper hammer head 222.

[0049] The working principle of this invention is:

[0050] Under negative pressure, air enters the crushing zone 60 from the lower air chamber 50 through the gap between the high-speed rotating large disc 20 and the crushing tooth ring 21, carrying the material into the outer cavity 70 of the guide hood. The trajectory of the material in the outer cavity 70 of the guide hood is as follows: Figure 5As shown, under the action of centrifugal force, the material adheres tightly to the inner side of the outer ring plate 12 of the guide shroud. A portion of the material directly spirals into the circulating overflow cavity 90, while another portion is expected to be bounced back by the guide shroud rib plate 13 and change its trajectory before entering the circulating overflow cavity 90. Furthermore, large particles of material rotating at high speed will adhere tightly to the inner wall of the top cover 100 of the circulating overflow cavity 90 after entering the circulating overflow cavity 90.

[0051] The trajectory of the material in the circulating overflow chamber 90 is as follows Figure 6 As shown, the material is drawn into the inner cavity 80 of the guide hood by negative pressure. The classifying wheel 30 rotates and drives the material entering the area of ​​the classifying wheel 30 to rotate together. The particles with small mass have small centrifugal force and are drawn into the interior of the classifying wheel 30 by negative pressure, and then discharged from the outlet 40. The particles with large mass have large centrifugal force and are thrown out by the classifying wheel 30 into the inner cavity 80 of the guide hood, and finally fall onto the high-speed large disc 20, and return to the crushing zone 60 through the gap between the inner ring plate 11 of the guide hood and the high-speed large disc 20.

[0052] The newly added internal gear ring 14 can reduce the rotational speed of the material to zero (centrifugal force reduced to zero), while the air cyclone is not affected by the internal gear ring 14 and maintains a certain rotational speed (centrifugal force not zero). This also helps to break the stratification phenomenon caused by the rotational motion of the material and air (heavier particles are closer to the cylinder wall), which is conducive to the negative pressure of the discharge port 40 drawing the material into the classifier wheel 30. After the feed particles enter the blade area of ​​the classifier wheel 30, they will be accelerated again by the classifier wheel 30 to the same rotational speed as the classifier wheel 30. If the circulating overflow cavity 90 maintains a certain rotating airflow, the feed particles will be able to rotate at a certain speed. Before entering the area of ​​the classifier wheel 30, the airflow will accelerate the rotation, which helps to reduce the load on the motor of the classifier wheel 30. The guide shroud rib 13 disrupts the rotating airflow. By changing the installation angle of the guide shroud rib 13, the rotating airflow in the circulating overflow cavity 90 can also be changed. That is, the guide shroud rib 13 can be arranged vertically or inclined. When the guide shroud rib 13 is inclined, it has less impact on the air circulation in the outer cavity 70 of the guide shroud. The air circulation speed in the circulating overflow cavity 90 is higher. The material dispersed in the circulating overflow cavity 90 can obtain a higher rotation speed after reaching the inner cavity 80 of the guide shroud.

[0053] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An ultrafine pulverizer, characterized in that, The device includes a guide shroud with an internal toothed ring, located above a rotating large disk (20), for forming the outer cavity (70) and inner cavity (80) of the guide shroud of an ultrafine pulverizer. It is characterized by comprising an inner ring plate (11), an outer ring plate (12), and a guide shroud rib (13). The outer ring plate (12) is sleeved outside the inner ring plate (11) and is coaxially arranged with the inner ring plate (11). The toothed ring (14) is arranged on the inner side of the outer ring plate (12) of the flow guide and has the same axial extension height as the outer ring plate (12). It is installed together with the outer ring plate (12) of the flow guide on the inner wall of the crusher cylinder (10) by screws. The flow guide rib plate (13) is provided in multiple sets and is distributed circumferentially between the inner ring plate (11) and the outer ring plate (12) of the flow guide, for connecting and fixing the inner ring plate (11) and the outer ring plate (12) of the flow guide. The ultrafine pulverizer also includes a pulverizing tooth ring (21) and a hammer assembly (22) located in the pulverizing zone (60). The pulverizing tooth ring (21) is installed on the inner wall of the pulverizer cylinder (10). The hammer assembly (22) includes a lower hammer (221) installed in a circular array on the edge of the high-speed rotating large disc (20), a circular ring plate (223) pressed on the upper layer of the lower hammer (221), and an upper hammer (222) placed above the circular ring plate (223) and corresponding to the lower hammer (221). The upper hammer (222), lower hammer (221) and circular ring plate (223) are fastened to the high-speed large disc (20) by screws. The internal gear ring is located above the crushing zone and is used to utilize the residual kinetic energy of the material for secondary crushing and to eliminate the rotational stratification of the material. Furthermore, the height of the lower hammer head (221) is twice that of the upper hammer head (222).

2. The ultrafine pulverizer according to claim 1, characterized in that, The surface of the guide shield rib plate (13) is vertically arranged along the axial direction.

3. The ultrafine pulverizer according to claim 1, characterized in that, The surface of the guide shield stiffener (13) is arranged at an angle.

4. The ultrafine pulverizer according to claim 1, characterized in that, The internal gear ring (14) is made of white cast iron or wear-resistant steel.

5. The ultrafine pulverizer according to claim 1, characterized in that, The tooth profile of the internal gear ring (14) is different from that of the crushing gear ring (21).

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