Vertical dry-method superfine stirring mill

Abstract

The invention relates to a vertical dry superfine stirring mill which comprises at least one group of two grinding cavities, the two grinding cavities are arranged in a high-low mode, and the bottoms of the two grinding cavities are communicated and connected through corresponding channels; the multifunctional stirring and grinding mechanism comprises a stirring shaft rotationally arranged in the grinding cavity, the stirring shaft is hollow, a corresponding spiral feeding blade is arranged at the hollow position of the stirring shaft, and a plurality of material passing holes communicated to the hollow position of the stirring shaft are uniformly formed in the side wall of the stirring shaft; a plurality of stirring rods located between every two adjacent material passing holes are uniformly distributed and fixedly connected to the side wall of the stirring shaft, and the stirring rods are fixedly connected to the stirring shaft through high-stability connecting assemblies; and the driving mechanism comprises a positive and negative rotation driving motor for driving the stirring shaft to rotate. According to the invention, materials and grinding medium balls can be subjected to multi-section short-distance lifting, and the materials and the grinding medium balls after short-distance lifting can be ensured to be subjected to corresponding stirring force in time, so that the grinding effect on the materials is obviously improved.

Description

Technical Field

[0001] This invention relates to a vertical dry ultrafine stirred mill, which can effectively follow the grinding particle size requirements and actively adjust the grinding time of materials and grinding media balls in the equipment, thereby significantly improving the adaptability of the equipment. Background Technology

[0002] A vertical dry stirred mill is a high-efficiency ultrafine grinding equipment. A traditional vertical dry stirred mill generally includes a grinding chamber and a stirring shaft set inside the grinding chamber, with multiple corresponding stirring rods evenly distributed and fixed on the stirring shaft. Driven by a corresponding drive mechanism, the stirring shaft drives the stirring rods to rotate, thereby stirring the material and grinding media balls located in the grinding chamber, so that the grinding media balls effectively collide with the material, thus realizing the grinding operation of the material.

[0003] To improve the grinding effect and efficiency of materials, existing vertical dry stirred mills have incorporated a lifting mechanism into the existing stirring mechanism. This lifting mechanism circulates and elevates the material and grinding media balls during the stirring process, increasing their kinetic energy and contact rate with the stirring mechanism, thus aiding in improved grinding efficiency. While this increases the contact rate to some extent, the material and grinding media balls within the lifting mechanism, during the lifting process, cannot readily contact the stirring mechanism. Therefore, given the same volume, simply adding a lifting mechanism cannot effectively improve the grinding effect. To ensure improved grinding performance, vertical dry stirred mills with added lifting mechanisms often only achieve this by increasing the volume of the grinding chamber, making the addition of the lifting mechanism relatively insignificant.

[0004] Therefore, the research objective of this invention is to design a vertical dry ultrafine stirred mill that can effectively lift materials and grinding media balls in multiple short stages without increasing the volume of the grinding chamber, and ensure that the materials and grinding media balls are subjected to the corresponding stirring force in a timely manner after the short-stage lifting, thereby effectively and significantly improving the grinding effect and grinding efficiency of the materials. Summary of the Invention

[0005] In view of the technical problems existing in the prior art, the present invention provides a vertical dry ultrafine stirred mill, which can effectively solve the technical problems existing in the prior art.

[0006] The technical solution of this invention is: A vertical dry ultrafine stirred mill, comprising: At least one set of two grinding chambers, the two grinding chambers in one set are arranged at different heights and connected by corresponding channels at the bottom, the upper side of the grinding chamber at the higher position is provided with a feed inlet and the upper side of the grinding chamber at the lower position is provided with a corresponding discharge outlet. A multi-functional stirring and grinding mechanism includes a stirring shaft rotatably disposed in the grinding chamber. The stirring shaft is hollow and has corresponding spiral feeding blades disposed in the hollow part. Multiple material passage holes communicating with the hollow part are evenly distributed on the side wall of the stirring shaft, and multiple stirring rods located between two adjacent material passage holes are evenly distributed and fixed on the side wall of the stirring shaft. The stirring rods are fixed to the stirring shaft through a high-stability connecting component. The driving mechanism includes a forward and reverse drive motor for driving the stirring shaft to rotate. The material and grinding media balls enter the grinding chamber located at a higher position through the feed port. Under the action of gravity, the material and grinding media balls are squeezed into the grinding chamber located at a lower position through the channel and discharged from the discharge port by overflow. During the flow of the material and grinding media balls, the forward and reverse drive motor drives the stirring shaft to drive the stirring rod to stir the material and grinding media balls.

[0007] The stirring shaft in the high grinding chamber starts to rotate forward to transfer the material and grinding media balls through the next feed hole to the next feed hole, and the stirring shaft in the low grinding chamber starts to rotate in reverse to transfer the material and grinding media balls through the previous feed hole to the next feed hole, so as to prevent the discharge of the mixture and prolong the stirring time of the material and grinding media balls in the grinding chamber.

[0008] The stirring shaft in the high grinding chamber is driven to reverse so as to transfer the material and grinding media balls from one feed hole to the next. The stirring shaft in the low grinding chamber is driven to rotate forward so as to transfer the material and grinding media balls from the next feed hole to the next feed hole. This helps to discharge the mixture and shortens the mixing time of the material and grinding media balls in the grinding chamber.

[0009] The stirring shaft is connected to the output shaft of the forward and reverse drive motor via a corresponding flange. A fixed shaft is provided at the center of the hollow part of the stirring shaft and fixed to the flange. The spiral feeding blades are respectively fixed to the corresponding fixed shafts.

[0010] The fixed shaft is hollow and filled with corresponding vibration-absorbing material. The vibration-absorbing material consists of numerous damping particles for vibration reduction. The damping particles are spherical particles made of aluminum alloy. Several corresponding reinforcing ribs are arranged inward at intervals in the hollow position of the fixed shaft. The spherical particles fill the hollow part of the fixed shaft with the reinforcing ribs.

[0011] The outer side of the grinding chamber is provided with corresponding heat exchange jackets in a sandwich state, and the heat exchange jackets are respectively provided with corresponding coolant inlet pipes and coolant outlet pipes.

[0012] The high-stability connection assembly includes an annular weld for welding and fixing the stirring rods to the outer wall of the stirring shaft. The stirring rods are respectively axially shaped and hollow, each with a corresponding connection hole. The outer wall of the stirring shaft has corresponding insertion slots at positions corresponding to the connection holes. A corresponding tension helical spring is installed within each connection hole of the stirring rod. The inner end of each tension helical spring is engaged with the corresponding insertion slot and fixed by a corresponding fixing weld. The outer end of each tension helical spring is stretched outward and fixed to a corresponding end cover plate. The end cover plates are fixedly welded to the outer ends of the stirring rods to close the hollow portion of the stirring rods. In this embodiment, the outer ends of the tension helical springs are hooked onto the hanging rings of the end cover plates.

[0013] The grinding chamber is tubular, and the channel is a U-shaped tube with a diameter smaller than that of the grinding chamber. Both ends of the U-shaped tube are connected to the grinding chamber via corresponding guide covers.

[0014] Compared with the prior art, the advantages and positive effects of the present invention are as follows: 1) This invention comprises a continuous channel consisting of at least one set of two grinding chambers. The two grinding chambers are arranged at different heights and their bottoms are connected by corresponding channels. Furthermore, the invention further includes hollow stirring shafts arranged in stages within the two grinding chambers, with corresponding spiral feeding blades installed in the hollow portions of the stirring shafts. Most importantly, the sidewalls of the stirring shafts are evenly distributed with multiple material passage holes connecting to the hollow portions, and multiple stirring rods are evenly fixed to the sidewalls of the stirring shafts between adjacent material passage holes. During the grinding process, the material and grinding media balls enter the higher grinding chamber through the inlet. Under gravity, the material and grinding media balls are pushed through the channels towards the lower grinding chamber and discharged from the outlet via overflow. During this process, the forward and reverse drive motors of the drive mechanism drive the stirring shafts to agitate the material and grinding media balls.

[0015] In this process, the stirring shaft in the upper grinding chamber is driven to rotate forward to transport the material and grinding media balls upward, while the stirring shaft in the lower grinding chamber is driven to rotate in reverse to transport the material and grinding media balls downward. This hinders the discharge of the mixture and prolongs the mixing time of the material and grinding media balls in the grinding chamber, thereby achieving a smaller particle size. Alternatively, the stirring shaft in the upper grinding chamber is driven to rotate in reverse to transport the material and grinding media balls downward, while the stirring shaft in the lower grinding chamber is driven to rotate forward to transport the material and grinding media balls upward. This assists in the discharge of the mixture and shortens the mixing time of the material and grinding media balls in the grinding chamber, enabling the grinding of materials with larger particle sizes. This effectively and significantly improves the adaptability of the invention.

[0016] 2) During the rotation of the stirring shaft of the present invention, the material and grinding media balls mainly flow between two adjacent feed holes. For example, when the material and grinding media balls are lifted up with the rotation of the stirring shaft, the material and grinding media balls mainly enter the spiral feeding blade through the upper side of the next feed hole and are lifted to the lower side of the previous feed hole for output. This effectively forms multiple short-distance lifting of the mixture, and the material and grinding media balls after the short-distance lifting can contact the rotating stirring rod in time, thereby receiving sufficient stirring force. Thus, without increasing the volume of the grinding chamber, the grinding effect and grinding efficiency of the material are effectively and significantly improved.

[0017] 3) The hollow portion of the stirring shaft of this invention is provided with a fixed shaft, and the spiral feeding blades are fixed to the corresponding fixed shaft. The fixed shaft is hollow, and several corresponding reinforcing ribs are arranged inwards at intervals within its hollow portion. Furthermore, this invention fills the hollow portion of the fixed shaft with reinforcing ribs with spherical particles made of aluminum alloy. The surface friction between the spherical particles dissipates energy, achieving good vibration reduction and absorption effects. Moreover, the lightweight and high-strength aluminum alloy spherical particles can form a compression support with the reinforcing ribs and the hollow portion of the fixed shaft, ensuring that the fixed shaft with vibration-absorbing material has sufficient rigidity, thereby effectively providing rigid support for the spiral feeding blades. This ensures that the stirring shaft can still operate stably under the large vibration environment of multi-segment short-distance lifting of materials and grinding media balls, thus ensuring the practical effect of this invention.

[0018] 4) The grinding chamber of the present invention is provided with corresponding heat exchange jackets in a sandwich state on the outside. The heat exchange jackets are provided with corresponding coolant inlet pipes and coolant outlet pipes. During the grinding process of the material, cooling water is continuously introduced into the heat exchange jackets to keep the temperature inside the grinding chamber below a certain range, so as to effectively overcome the temperature rise problem caused by a large amount of grinding contact.

[0019] 5) Due to the multi-segment, short-distance lifting process of the material and grinding media balls, the contact rate between them and the stirring rod will significantly increase. The stirring rod, in addition to the horizontal shear force, will also be subjected to significant longitudinal shear force. Furthermore, the increased contact rate between the stirring rod and the material and grinding media balls will inevitably increase the vibration of the stirring rod. Therefore, simply relying on welding between the stirring rod and the stirring shaft is insufficient to effectively maintain the connection stability of the stirring rod. To address this, the stirring rod of the present invention is fixed to the stirring shaft via a multi-functional connecting assembly. This multi-functional connecting assembly includes an annular weld for welding and fixing the stirring rod to the outer wall of the stirring shaft, and a tension helical spring disposed in the connecting hole of the stirring rod. The inner ends of the tension helical springs are respectively engaged in the insertion slots of the stirring shaft and fixed by corresponding fixing welds, while the outer ends of the tension helical springs are respectively stretched outwards and fixed to corresponding end caps. These end caps are then fixedly welded to the outer ends of the stirring rod to seal the hollow portion of the stirring rod. By using a tension helical spring, the end cover plate is installed by fixing one end and tensioning the other end. After the end cover plate is welded to the outer end of the stirring rod, the tension helical spring is stretched to pull and fix the stirring rod, thereby improving the connection stability of the stirring rod and effectively reducing the vibration generated during the operation of the stirring rod, thus further improving the structural stability of the stirring rod.

[0020] 6) The grinding chamber of the present invention is tubular, and the channel adopts a U-shaped tube with a diameter smaller than that of the grinding chamber. The two ends of the U-shaped tube are respectively connected to the corresponding grinding chamber through corresponding material guide covers. This effectively ensures that the material in the grinding chamber located at a high position can smoothly squeeze and transport the material stored in the U-shaped tube, and effectively ensures that the amount of material stored in the U-shaped tube does not exceed the set range value, thereby reducing the flow of material in the U-shaped tube and preventing the amount of material in the flow state from affecting the grinding efficiency.

[0021] 7) This invention can achieve ultra-fine grinding of materials by connecting two or more grinding chambers, with the stirring shafts in multiple grinding chambers starting stirring simultaneously. This maintains grinding efficiency while effectively improving the grinding effect. When connecting, simply connect the feed inlet of the higher grinding chamber in the latter group to the discharge outlet of the lower grinding chamber in the former group. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0023] Figure 2 This is a front view of Embodiment 1 of the present invention.

[0024] Figure 3 This is a cross-sectional view of Embodiment 1 of the present invention.

[0025] Figure 4 This is a schematic diagram of the functional stirring and grinding mechanism.

[0026] Figure 5 A schematic diagram of a structure in which vibration-absorbing material is filled inside a fixed shaft.

[0027] Figure 6 This is a schematic diagram of the structure in which the stirring rod is fixed to the stirring shaft via a highly stable connecting assembly.

[0028] Figure 7 This is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0029] Figure 8 This is a front view of Embodiment 2 of the present invention.

[0030] In the attached diagram: 1. Grinding chamber; 2. Channel; 3. Feed inlet; 4. Discharge outlet; 5. Multifunctional stirring and grinding mechanism; 501. Stirring shaft; 502. Spiral feeding blade; 503. Stirring rod; 6. Material passage hole; 7. Drive mechanism; 701. Forward and reverse drive motor; 702. Flange; 8. Fixed shaft; 9. Vibration-absorbing material; 10. Heat exchange jacket; 11. Coolant inlet pipe; 12. Coolant outlet pipe; 1301. Circular weld; 1302. Tensioning spiral spring; 1303. Fixed weld; 1304. End cover plate; 14. Connecting hole; 15. Material guide cover; 16. Reinforcing rib. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0032] Example 1 refer to Figure 1-6 A vertical dry ultrafine stirred mill, comprising: A set of two grinding chambers 1, the two grinding chambers 1 are arranged at different heights and connected by corresponding channels 2 at the bottom. The upper side of the grinding chamber 1 at the higher position is provided with a feed inlet 3, and the upper side of the grinding chamber 1 at the lower position is provided with a corresponding discharge outlet 4. The multi-functional stirring and grinding mechanism 5 includes a stirring shaft 501 rotatably disposed in the grinding chamber 1. The stirring shaft 501 is hollow and has corresponding spiral feeding blades 502 disposed in the hollow part. Multiple material passage holes 6 are evenly distributed on the side wall of the stirring shaft 501, which are connected to the hollow part. Multiple stirring rods 503 are evenly distributed and fixed on the side wall of the stirring shaft 501, located between two adjacent material passage holes 6. The stirring rods 503 are fixed to the stirring shaft 501 through a high-stability connecting component. The drive mechanism 7 includes a forward and reverse drive motor 701 for driving the stirring shaft 501 to rotate. The material and grinding media balls enter the grinding chamber 1 located at a higher position through the feed port 3. Under the action of gravity, the material and grinding media balls are squeezed into the grinding chamber 1 located at a lower position through the channel 2 and discharged from the discharge port 4 by overflow. During the flow of the material and grinding media balls, the forward and reverse drive motor 701 drives the stirring shaft 501 to drive the stirring rod 503 to stir the material and grinding media balls.

[0033] The stirring shaft 501 in the grinding chamber 1 located at the upper position is driven to start rotating forward to transfer the material and grinding media balls through the next feed hole 6 to the next feed hole 6, and the stirring shaft 501 in the grinding chamber 1 located at the lower position is driven to start rotating in reverse to transfer the material and grinding media balls through the previous feed hole 6 to the next feed hole 6, so as to prevent the discharge of the mixture and prolong the stirring time of the material and grinding media balls in the grinding chamber 1.

[0034] The stirring shaft 501 in the high grinding chamber 1 is driven to reverse so as to transfer the material and grinding media balls through the previous feed hole 6 to the next feed hole 6. The stirring shaft 501 in the low grinding chamber 1 is driven to rotate forward so as to transfer the material and grinding media balls through the next feed hole 6 to the next feed hole 6, thereby assisting in the discharge of the mixture and shortening the stirring time of the material and grinding media balls in the grinding chamber 1.

[0035] This invention comprises a continuous channel consisting of two grinding chambers 1, arranged at different heights and connected at their bottoms by corresponding channels 2. Further, hollow stirring shafts 501 are arranged in stages within the two grinding chambers 1, with corresponding spiral feeding blades 502 positioned within the hollow portion of the stirring shafts 501. Most importantly, multiple material passage holes 6 are evenly distributed on the sidewalls of the stirring shafts 501, connecting to their hollow portions, and multiple stirring rods 503 are evenly fixed to the sidewalls of the stirring shafts 501, located between adjacent material passage holes 6. During the grinding process, the material and grinding media balls enter the higher grinding chamber 1 through the feed inlet 3. Under gravity, the material and grinding media balls are pushed through the channels 2 towards the lower grinding chamber 1 and discharged from the outlet 4 via overflow. During this process, the forward and reverse drive motor 701 of the drive mechanism 7 drives the stirring shafts 501 to agitate the stirring rods 503, thus stirring the material and grinding media balls.

[0036] In this process, the stirring shaft 501 in the high grinding chamber 1 is driven to rotate forward to transport the material and grinding media balls upward, and the stirring shaft 501 in the low grinding chamber 1 is driven to rotate in reverse to transport the material and grinding media balls downward. This can prevent the discharge of the mixture and prolong the stirring time of the material and grinding media balls in the grinding chamber 1, thereby making the material achieve a smaller particle size. Alternatively, the stirring shaft 501 in the high grinding chamber 1 is driven to rotate in reverse to transport the material and grinding media balls downward, and the stirring shaft 501 in the low grinding chamber 1 is driven to rotate forward to transport the material and grinding media balls upward. This can assist in the discharge of the mixture and shorten the stirring time of the material and grinding media balls in the grinding chamber 1, so as to realize the grinding operation of materials with larger particle sizes, thereby effectively and significantly improving the adaptability of the present invention.

[0037] During the rotation of the stirring shaft 501 of the present invention, the material and grinding media balls mainly flow between two adjacent feed holes 6. For example, when the material and grinding media balls are lifted up as the stirring shaft 501 rotates, the material and grinding media balls mainly enter the spiral feeding blade 502 through the upper side of the next feed hole 6 and are lifted to the lower side of the previous feed hole 6 for output. This effectively forms multiple short-distance lifting of the mixture, and the material and grinding media balls after short-distance lifting can come into contact with the rotating stirring rod 503 in time, thereby receiving sufficient stirring force. Thus, without increasing the volume of the grinding chamber 1, the grinding effect and grinding efficiency of the material are effectively and significantly improved.

[0038] The stirring shaft 501 is connected to the output shaft of the forward and reverse drive motor 701 via a corresponding flange 702. A fixed shaft 8 is provided at the center of the hollow part of the stirring shaft 501 and fixed to the flange 702. The spiral feeding blades 502 are respectively fixed to the corresponding fixed shafts 8.

[0039] The fixed shaft 8 is hollow and filled with corresponding vibration-absorbing material 9. In this embodiment, the vibration-absorbing material 9 consists of numerous damping particles for vibration reduction, which are spherical particles made of aluminum alloy. Several reinforcing ribs 16 are arranged at intervals inwards in the hollow portion of the fixed shaft 8. The spherical particles fill the hollow portion of the fixed shaft 8 with the reinforcing ribs 16. Energy dissipation through surface friction between the spherical particles achieves good vibration reduction and absorption effects. Furthermore, the lightweight and high-strength aluminum alloy spherical particles form a compression support with the reinforcing ribs 16 and the hollow portion of the fixed shaft 8, ensuring that the fixed shaft 8 with the vibration-absorbing material 9 has sufficient rigidity, thereby effectively providing rigid support for the spiral feed blade 502.

[0040] The stirring shaft 501 of this invention has a fixed shaft 8 in its hollow portion. The spiral feeding blades 502 are fixed to the corresponding fixed shaft 8. The fixed shaft 8 is hollow, and several corresponding reinforcing ribs 16 are arranged inward at intervals in its hollow position. Furthermore, this invention fills the hollow portion of the fixed shaft 8 with reinforcing ribs 16 with spherical particles made of aluminum alloy. The surface friction between the spherical particles dissipates energy, achieving good vibration reduction and absorption effects. The lightweight and high-strength aluminum alloy spherical particles also form a compression support with the reinforcing ribs 16 and the hollow portion of the fixed shaft 8, ensuring that the fixed shaft 8 with the vibration-absorbing material 9 has sufficient rigidity, thereby effectively providing rigid support for the spiral feeding blades 502. This ensures that the stirring shaft 501 can still operate stably under the large vibration environment of multi-segment short-distance lifting of materials and grinding media balls, thus ensuring the practical effect of this invention.

[0041] The grinding chamber 1 is provided with heat exchange jackets 10 in a sandwich configuration on its outer side. Each heat exchange jacket 10 is equipped with a coolant inlet pipe 11 and a coolant outlet pipe 12. During the grinding process, cooling water is continuously supplied to the heat exchange jackets 10 through the coolant inlet pipe 11 and the coolant outlet pipe 12 to keep the internal temperature of the grinding chamber 1 below a certain range, thereby effectively overcoming the temperature rise problem caused by a large amount of grinding contact.

[0042] The high-stability connection assembly includes an annular weld 1301 for welding and fixing the stirring rod 503 to the outer wall of the stirring shaft 501. The stirring rods 503 are respectively axially shaped and hollowly provided with corresponding connection holes 14. The outer wall of the stirring shaft 501 is provided with corresponding insertion slots at positions corresponding to the connection holes 14. Corresponding tension coil springs 1302 are respectively installed in the connection holes 14 of the stirring rods 503. The inner ends of the tension coil springs 1302 are respectively engaged in the corresponding insertion slots and fixed by the corresponding fixing weld 1303. The outer ends of the tension coil springs 1302 are respectively stretched outwards and fixed to corresponding end caps 1304. The end caps 1304 are respectively fixedly welded to the outer ends of the stirring rods 503 to close the hollow portion of the stirring rods 503. In this embodiment, the outer ends of the tension coil springs 1302 are respectively hooked onto the hanging rings of the end caps 1304.

[0043] As the material and grinding media balls undergo multiple short-distance lifting processes, their contact rate with the stirring rod 503 will significantly increase. Furthermore, the stirring rod 503 will be subjected to significant longitudinal shear force in addition to horizontal shear force. This increased contact rate between the stirring rod 503 and the material and grinding media balls will inevitably lead to a significant increase in the vibration of the stirring rod 503. Therefore, simply relying on welding between the stirring rod 503 and the stirring shaft 501 is insufficient to effectively maintain the connection stability of the stirring rod 503. Therefore, the stirring rod 503 of the present invention is fixed to the stirring shaft 501 by a multifunctional connecting assembly. The multifunctional connecting assembly includes an annular weld 1301 for welding and fixing the stirring rod 503 to the outer wall of the stirring shaft 501, and a tensioning helical spring 1302 disposed in the connecting hole 14 of the stirring rod 503. The inner ends of the tensioning helical spring 1302 are respectively engaged in the insertion groove of the stirring shaft 501 and fixed by the corresponding fixing weld 1303, while the outer ends of the tensioning helical spring 1302 are respectively stretched outward and fixed to the corresponding end cover plate 1304. The end cover plate 1304 is respectively fixedly welded to the outer end of the stirring rod 503 to close the hollow part of the stirring rod 503. By intervening with the tension helical spring 1302, the end cover plate 1304 is installed in a manner where one end is fixed and the other end is tensioned and connected in place. After the end cover plate 1304 is welded to the outer end of the stirring rod 503, the tension helical spring 1302 is in a stretched state to pull and fix the stirring rod 503, thereby improving the connection stability of the stirring rod 503 and effectively reducing the vibration generated by the stirring rod 503 during operation, thereby further improving the structural stability of the stirring rod 503.

[0044] The grinding chamber 1 is tubular, and the channel 2 is a U-shaped tube with a diameter smaller than that of the grinding chamber 1. Both ends of the U-shaped tube are connected to the grinding chamber 1 via corresponding guide covers 15. This effectively ensures that the material in the high-positioned grinding chamber 1 can smoothly compress and transport the material stored in the U-shaped tube, and effectively ensures that the amount of material stored in the U-shaped tube does not exceed a set range, thereby reducing the flow rate of material in the U-shaped tube and preventing excessive material flow that could affect grinding efficiency.

[0045] Example 2 refer to Figure 7-8 The difference between this embodiment and Embodiment 1 is that the vertical dry ultrafine stirred mill includes two sets of four grinding chambers 1. The feed inlet 3 of the grinding chamber 1 located at the higher position in the latter set of grinding chambers 1 is connected to the discharge outlet 4 of the grinding chamber 1 located at the lower position in the former set of grinding chambers 1. By connecting two or more sets of grinding chambers 1 and simultaneously starting the stirring operation of the stirring shafts 501 in multiple sets of grinding chambers 1, the grinding effect can be effectively improved while maintaining the grinding efficiency, so as to efficiently achieve ultrafine grinding of materials.

[0046] It should be noted that this embodiment is implemented in the same way as the first embodiment in terms of principle and technical effect. For the sake of brevity, any parts not mentioned in this embodiment can be referred to the corresponding content in the first embodiment.

[0047] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments that can be applied to other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A vertical dry ultrafine stirred mill, characterized in that, include: At least one set of two grinding chambers (1), the two grinding chambers (1) are set at different heights and connected by corresponding channels (2) at the bottom. The upper side of the grinding chamber (1) at the higher position is provided with a feed inlet (3) and the upper side of the grinding chamber (1) at the lower position is provided with a corresponding discharge outlet (4). The multifunctional stirring and grinding mechanism (5) includes a stirring shaft (501) rotatably disposed in the grinding chamber (1). The stirring shaft (501) is hollow and has a corresponding spiral feeding blade (502) in its hollow part. Multiple material passage holes (6) communicating with its hollow part are evenly distributed on the side wall of the stirring shaft (501). Multiple stirring rods (503) located between two adjacent material passage holes (6) are evenly fixed on the side wall of the stirring shaft (501). The stirring rods (503) are fixed to the stirring shaft (501) through a high-stability connecting component. The drive mechanism (7) includes a forward and reverse drive motor (701) for driving the stirring shaft (501) to rotate. The material and grinding media balls enter the grinding chamber (1) located at a high position through the feed port (3). Under the action of gravity, the material and grinding media balls are squeezed into the grinding chamber (1) located at a low position through the channel (2) and discharged from the discharge port (4) by overflow. During the flow of the material and grinding media balls, the forward and reverse drive motor (701) drives the stirring shaft (501) to drive the stirring rod (503) to stir the material and grinding media balls.

2. The vertical dry ultrafine stirred mill according to claim 1, characterized in that, The stirring shaft (501) in the grinding chamber (1) located at the high position is driven to start rotating forward to transfer the material and grinding media balls through the next feed hole (6) to the next feed hole (6), and the stirring shaft (501) in the grinding chamber (1) located at the low position is driven to start rotating in reverse to transfer the material and grinding media balls through the previous feed hole (6) to the next feed hole (6), so as to prevent the discharge of the mixture and prolong the stirring time of the material and grinding media balls in the grinding chamber (1).

3. A vertical dry ultrafine stirred mill according to claim 1, characterized in that, The stirring shaft (501) in the grinding chamber (1) located at the high position is started to reverse to transfer the material and grinding media balls through the previous material passage (6) to the next material passage (6), and the stirring shaft (501) in the grinding chamber (1) located at the low position is started to rotate forward to transfer the material and grinding media balls through the next material passage (6) to the next material passage (6), so as to assist the discharge of the mixture and shorten the stirring time of the material and grinding media balls in the grinding chamber (1).

4. A vertical dry ultrafine stirred mill according to claim 1, characterized in that, The stirring shaft (501) is connected to the output shaft end of the forward and reverse drive motor (701) via a corresponding flange (702). A fixed shaft (8) is provided at the center of the hollow part of the stirring shaft (501) and fixed to the flange (702). The spiral feeding blades (502) are respectively fixed to the corresponding fixed shafts (8).

5. A vertical dry ultrafine stirred mill according to claim 4, characterized in that, The fixed shaft (8) is hollow and filled with corresponding vibration-absorbing material (9). The vibration-absorbing material (9) consists of a number of damping particles for vibration reduction. The damping particles are spherical particles made of aluminum alloy. Several corresponding reinforcing ribs (16) are arranged inward at intervals in the hollow position of the fixed shaft (8). The spherical particles fill the hollow part of the fixed shaft (8) with the reinforcing ribs (16).

6. A vertical dry ultrafine stirred mill according to claim 1, characterized in that, The grinding chamber (1) is provided with heat exchange jackets (10) in a sandwich state on the outside. The heat exchange jackets (10) are provided with coolant inlet pipes (11) and coolant outlet pipes (12).

7. A vertical dry ultrafine stirred mill according to claim 1, characterized in that, The high-stability connection assembly includes an annular weld (1301) for welding and fixing the stirring rod (503) to the outer wall of the stirring shaft (501). The stirring rod (503) is axially oriented and hollowly provided with corresponding connection holes (14). The outer wall of the stirring shaft (501) is provided with corresponding insertion grooves at positions corresponding to the connection holes (14). The connection holes (14) of the stirring rod (503) are respectively provided with corresponding tensioning helical springs (1302). The inner ends of the tensioning helical springs (1302) are respectively engaged in the corresponding insertion grooves and fixed by the corresponding fixing weld (1303). The outer ends of the tensioning helical springs (1302) are respectively stretched outward and fixed to the corresponding end caps (1304). The end caps (1304) are respectively fixedly welded to the outer ends of the stirring rods (503) to close the hollow part of the stirring rods (503).

8. A vertical dry ultrafine stirred mill according to claim 1, characterized in that, The grinding chamber (1) is tubular, and the channel (2) is a U-shaped tube with a diameter smaller than that of the grinding chamber (1).

9. A vertical dry ultrafine stirred mill according to claim 8, characterized in that, The two ends of the U-shaped tube are respectively connected to the grinding chamber (1) through corresponding guide covers (15).

10. A vertical dry ultrafine stirred mill according to claim 1, characterized in that, The vertical dry ultrafine stirred mill includes two sets of four grinding chambers (1). The feed inlet (3) of the grinding chamber (1) located at the higher position in the latter set of grinding chambers (1) is connected to the discharge outlet (4) of the grinding chamber (1) located at the lower position in the former set of grinding chambers (1).

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