A graded wheel protective ball mill with ball jumping interception function

Abstract

This utility model discloses a classifying wheel protective ball mill with a grinding ball bounce prevention function, belonging to the technical field of grinding equipment. It includes a shell with a grinding chamber, a classifying mechanism, and a stirring shaft. The classifying wheel on the classifying mechanism is suspended above the top of the stirring shaft. A baffle sleeve is suspended inside the grinding chamber, positioned above the top of the stirring shaft and below the classifying wheel. A hollow hourglass-shaped tube is installed inside the baffle sleeve, with its two ends opening towards the top of the stirring shaft and the bottom of the classifying wheel, respectively. A conical stop with its tip pointing inwards is located at the center of the opening at the end of the hollow tube facing the bottom of the classifying wheel. The minimum diameter of the inner wall of the hollow tube is smaller than the diameter of the grinding ball. This classifying wheel protective ball mill with a grinding ball bounce prevention function can reduce the kinetic energy of the grinding balls bouncing, prevent the grinding balls from colliding with the classifying wheel, thereby extending the service life of the equipment and improving grinding efficiency and classification accuracy.

Description

Technical Field

[0001] This utility model belongs to the field of grinding equipment technology, specifically relating to a graded wheel protective ball mill with a ball jumping interception function. Background Technology

[0002] Ball mills are key equipment for further pulverizing materials after they have been crushed. Their working principle is to pulverize materials to the required particle size through the rotation, impact and grinding action of grinding balls in the grinding chamber. The pulverized materials are then classified and screened by a classifying wheel, and materials that meet the particle size requirements are discharged from the outlet.

[0003] During the operation of a ball mill, as the grinding balls move and slide within the grinding chamber with the rotation of the stirring shaft, some grinding balls may jump around, especially near the classifying wheel. These jumping grinding balls are prone to colliding with the high-speed rotating classifying wheel. This collision not only leads to accelerated wear of the classifying wheel and shortens its service life, but may also cause problems such as eccentricity and vibration of the classifying wheel due to the impact force generated by the collision, affecting the classification accuracy and normal operation of the equipment.

[0004] Therefore, there is an urgent need for a protective mechanism to prevent the grinding balls from jumping off and colliding with the grading wheel in order to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a classifying wheel protective ball mill with a grinding ball jump interception function, which can reduce the kinetic energy of the grinding ball jump, prevent the grinding ball from colliding with the classifying wheel, thereby extending the service life of the equipment and improving grinding efficiency and classification accuracy.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a classifying wheel protective ball mill with a ball-jumping interception function, comprising a shell with a grinding chamber, a classifying mechanism that can be sealed and connected with the grinding chamber at the top opening of the shell, a stirring shaft for stirring grinding balls being arranged along the axial direction at the bottom of the grinding chamber, a classifying wheel on the classifying mechanism being suspended above the top of the stirring shaft, a baffle sleeve being suspended inside the grinding chamber and placed above the top of the stirring shaft and below the classifying wheel, the outer diameter of the baffle sleeve being greater than or equal to the outer diameter of the classifying wheel, and a gap for material passage being reserved between the outer wall of the baffle sleeve and the inner wall of the grinding chamber;

[0007] The baffle sleeve contains an hourglass-shaped hollow tube. The two ends of the hollow tube open towards the top of the stirring shaft and the bottom of the classifying wheel, respectively. A conical stop with its tip pointing inward is located at the center of the opening at the end of the hollow tube facing the bottom of the classifying wheel. A gap is reserved between the conical stop and the inner wall of the hollow tube for material to pass through. The minimum diameter of the inner wall of the hollow tube is smaller than the diameter of the grinding ball.

[0008] Optionally, a feeding chamber communicating with the grinding chamber is formed between the inner wall of the baffle sleeve and the outer wall of the hollow tube, and a feeding pipe communicating with the feeding chamber and extending to the outside of the grinding chamber is provided on the outer periphery of the baffle sleeve.

[0009] The bottom edge of the baffle sleeve and the edge of the hollow tube facing the top of the stirring shaft are sandwiched together to form a slit feeding port for connecting the grinding chamber and the feeding chamber.

[0010] Optionally, the outer wall of the guard sleeve is provided with a plurality of support rods along its radial direction, and the ends of the plurality of support rods opposite to the guard sleeve are all connected to the inner wall of the collar, and the collar can overlap on the overlapping folded edge provided on the inner wall of the grinding chamber.

[0011] Optionally, the housing includes a lower shell for mounting the stirring shaft, an upper shell for mounting the grading mechanism, and a middle shell for connecting the upper shell and the lower shell;

[0012] The lower shell and the middle shell are cylindrical, and the upper shell is frustoconical.

[0013] Optionally, the upper shell, the middle shell, and the lower shell are connected by flanges.

[0014] Optionally, a sleeve is provided on the outer periphery of the lower shell, and a sealed cavity is formed between the sleeve and the lower shell, and two joints are provided on the sleeve that communicate with the sealed cavity respectively.

[0015] Optionally, the overlapping fold is provided at the bottom edge of the middle shell, and the collar can slide down from the top opening of the middle shell to overlap the overlapping fold.

[0016] Optionally, it also includes several air supply pipes that are respectively connected to the lower inner wall of the grinding chamber. The ends of the several air supply pipes away from the grinding chamber are all connected to an annular sleeve that can be connected to a negative or positive pressure air source, and the several air supply pipes are arranged in a circumferential array along the axial direction of the grinding chamber.

[0017] Optionally, the end of the air supply pipe embedded in the grinding chamber is provided with a filter plug, the filter plug is provided with a mesh for connecting the air supply pipe and the grinding chamber, and the end face of the filter plug embedded in the grinding chamber is smoothly connected to the inner wall of the grinding chamber.

[0018] Optionally, the bottom of the grinding chamber and the side wall near the bottom are provided with ball discharge holes for discharging grinding balls. The ball discharge holes can be sealed by a sealing plug, and the end face of the sealing plug embedded in the grinding chamber can be smoothly connected with the inner wall of the grinding chamber.

[0019] Compared with existing technologies, the beneficial effects achieved by this utility model are as follows: A baffle sleeve with an outer diameter not less than that of the classifier wheel is added at the top of the stirring shaft and below the classifier wheel, and a gap for material passage is reserved between the outer wall of the baffle sleeve and the inner wall of the grinding chamber. When grinding balls flying at different angles pass through this gap, they are very likely to collide with the outer wall of the baffle sleeve and the inner wall of the grinding chamber within this gap range, thereby reducing the kinetic energy of the grinding balls themselves, making it impossible for the grinding balls to cross this gap. Even if a grinding ball manages to cross this gap and collide with the classifier wheel, its kinetic energy will be greatly reduced, so it will not have a significant impact on the classifier wheel. At the same time, the two ends of the hourglass-shaped hollow tube inside the baffle sleeve are respectively aligned with the top of the stirring shaft and the bottom of the classifier wheel. Grinding balls cannot pass through the hollow tube, and the gap between the conical baffle at the top of the hollow tube and the inner wall of the hollow tube can be used to guide the material to diffuse circumferentially towards the classifier wheel, increasing the material passage area and improving the material sorting efficiency. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a schematic diagram of the structure of a graded wheel protective ball mill with ball jumping interception function in a preferred embodiment of this utility model;

[0022] Figure 2 This is a top view of a graded wheel protective ball mill with ball jumping interception function in a preferred embodiment of the present invention.

[0023] Figure 3 This is a preferred embodiment of the present invention. Figure 2 A schematic cross-sectional view at point AA;

[0024] Figure 4 This is a schematic diagram of the structure of the baffle sleeve, hollow tube, conical block, feeding tube, support rod, and collar in a preferred embodiment of this utility model;

[0025] Among them, 1. Grinding chamber; 101. Upper shell; 102. Middle shell; 1021. Overlapping folded edge; 103. Lower shell; 2. Stirring shaft; 3. Grading wheel; 4. Baffle sleeve; 5. Hollow tube; 45. Feeding chamber; 4501. Gap feeding port; 6. Conical block; 7. Feeding pipe; 8. Support rod; 9. Collar; 10. Shell; 11. Joint; 12. Air supply pipe; 13. Annular sleeve; 14. Filter plug; 15. Sealing plug. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0027] It should be noted that if directional indicators (such as up, down, bottom, top, etc.) are involved in this embodiment, these directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more of that feature. Unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances. Example 1

[0028] like Figures 1-4As shown, a classifying wheel-protected ball mill with a ball-jumping interception function includes a shell with a grinding chamber 1. A classifying mechanism, capable of sealingly engaging with the grinding chamber 1, is located at the top opening of the shell. A stirring shaft 2 for stirring the grinding balls is arranged axially at the bottom of the grinding chamber 1. A classifying wheel 3 on the classifying mechanism is suspended above the top of the stirring shaft 2. A baffle sleeve 4 is suspended inside the grinding chamber 1, positioned above the stirring shaft 2 and below the classifying wheel 3. The outer diameter of the baffle sleeve 4 is greater than or equal to the outer diameter of the classifying wheel 3. A gap is reserved between the outer wall of the baffle sleeve 4 and the inner wall of the grinding chamber 1 for material passage. When the grinding balls pass through this gap, most of the obliquely jumping grinding balls will collide with the outer wall of the baffle sleeve 9 and the inner wall of the grinding chamber 1 within this gap, effectively consuming and reducing the kinetic energy of the jumping grinding balls, making it difficult for the obliquely jumping grinding balls to cross this gap. Some of the vertically jumping grinding balls, after passing through this gap, will have their jumping potential energy dissipated by their own gravity and will eventually fall naturally without colliding with the grading wheel 3. Some vertically jumping grinding balls with greater kinetic energy will also collide with the top of the grinding chamber 1 after crossing this gap, thus effectively dissipating their kinetic energy. A small number of grinding balls that collide with the top of the grinding chamber 1, the inner wall of the grinding chamber 1, or the outer wall of the blocking ring 9 will have a relatively small impact on the grading wheel 3 even if they do collide with it.

[0029] It is important to note that the baffle sleeve 4 contains an hourglass-shaped hollow tube 5. The two ends of the hollow tube 5 open towards the top of the stirring shaft 2 and the bottom of the classifying wheel 3, respectively. Material can pass through the hollow tube 5, but the minimum diameter of the inner wall of the hollow tube 5 is smaller than the diameter of the grinding balls, preventing the grinding balls from passing through. Furthermore, a conical baffle 6 with its tip pointing inwards is located at the center of the opening at the end of the hollow tube 5 facing the bottom of the classifying wheel 3. A gap is provided between the conical baffle 6 and the inner wall of the hollow tube 5 to allow material passage. This gap guides the material to diffuse circumferentially towards the classifying wheel 3, facilitating the passage of materials with the required particle size, thereby ensuring the efficiency of material classification and screening.

[0030] In this embodiment, the grading mechanism further includes a drive motor connected to the grading wheel 3 and a discharge shell connected to the top of the housing. The discharge shell contains a discharge chamber communicating with the grinding chamber 1, and a discharge pipe communicating with the discharge chamber is provided on the discharge shell. Material in the grinding chamber 1 must pass through the grading gaps on the grading wheel 3 to enter the discharge chamber. The material in the discharge chamber also floats with the gas discharged from the grinding chamber 1 until it is discharged from the discharge pipe. It should be noted that the discharge shell and the housing, and the housing and the output shaft of the drive motor, can be sealed using various methods such as air seals, mechanical seals, packing seals, labyrinth seals, and combined seals in the prior art to prevent material leakage. The stirring shaft 2, placed in the grinding chamber 1, extends one end to the outside of the housing, and the section of the stirring shaft 2 passing through the housing can also be sealed to the housing using various sealing methods in the prior art. The end of the stirring shaft 2 extending outside the housing can be driven and connected to the output end of another drive motor using various drive connection methods such as chain drive, belt drive, and gear drive.

[0031] Furthermore, such as Figure 3 , Figure 4 As shown, a feeding chamber 45 communicating with the grinding chamber 1 is formed between the inner wall of the baffle sleeve 4 and the outer wall of the hollow tube 5. A feeding pipe 7, communicating with the feeding chamber 45 and extending to the outside of the grinding chamber 1, is provided on the outer periphery of the baffle sleeve 4. The feeding pipe 7 extending to the outside of the grinding chamber 1 can connect with the output end of a pneumatic conveying device in the prior art, allowing the material to enter the grinding chamber 1 along with the airflow provided by the pneumatic conveying device and the feeding pipe 7. It should be noted that a slotted feeding port 4501, connecting the grinding chamber 1 and the feeding chamber 45, is formed between the bottom edge of the baffle sleeve 4 and the edge of the hollow tube 5 facing the top of the stirring shaft 2. The slotted feeding port 4501 is annular, allowing the material to diffuse around the stirring shaft 2 and quickly mix with the grinding balls when it enters the grinding chamber 1 with the gas, thereby increasing the efficiency of the ball mill.

[0032] The above, such as Figure 4 As shown, the outer wall of the guard sleeve 4 is provided with a number of support rods 8 along its radial direction. The ends of the support rods 8 away from the guard sleeve 4 are all connected to the inner wall of the collar 9. The collar 9 can overlap the overlapping folded edge 1021 provided on the inner wall of the grinding chamber 1 to ensure the positional stability of the guard sleeve 4 placed in the grinding chamber 1. Example 2

[0033] like Figures 1-4As shown, based on Embodiment 1, the housing includes a lower shell 103 for mounting the stirring shaft 2, an upper shell 101 for mounting the grading mechanism, and a middle shell 102 for connecting the upper shell 101 and the lower shell 103. It should be noted that the lower shell 103 and the middle shell 102 are cylindrical, while the upper shell 101 is frustoconical. The cylindrical lower shell 103 and the middle shell 102 provide sufficient space for the collision, sliding, and dropping of the grinding balls, while the frustoconical upper shell 101 gradually reduces the inner diameter of the upper half of the grinding chamber 1 to guide materials with the required particle size towards the grading wheel 3, thereby improving the efficiency of material sorting.

[0034] Furthermore, such as Figure 1 As shown, the upper shell 101, middle shell 102, and lower shell 103 are connected by flanges, meaning the outer shell adopts a split design, which not only facilitates the assembly of each component but also makes daily maintenance of the equipment easier. It should be noted that while the upper shell 101, middle shell 102, and lower shell 103 are connected by flanges, the sealing performance of the connection can also be enhanced through structures such as gaskets and rubber washers.

[0035] Furthermore, such as Figure 1 , Figure 3 As shown, a sleeve 10 is provided on the outer periphery of the lower shell 103, forming a sealed cavity between the sleeve 10 and the lower shell 103. The sleeve 10 has two connectors 11 that communicate with the sealed cavity. The two connectors 11 are connected to the top and bottom outer peripheries of the sealed cavity, respectively. The connector 11 connected to the top outer periphery of the sealed cavity can be connected to the drain port of a water pump, allowing the water pump to supply water to the sealed cavity. The connector 11 connected to the bottom outer periphery of the sealed cavity can be connected to the suction port of another water pump, which can extract water from the sealed cavity, thereby reducing the temperature inside the grinding chamber 1 through water cooling, providing a good environment for grinding, crushing, and classifying materials.

[0036] Furthermore, such as Figure 3 As shown, the overlapping folded edge 1021 is provided at the bottom edge of the middle shell 102, and the collar 9 can slide down from the top opening of the middle shell 102 to overlap with the overlapping folded edge 1021. Example 3

[0037] like Figures 1-4As shown in Embodiments 1 and 2, the classifier-type ball mill with ball-jumping interception function further includes several air supply pipes 12 that communicate with the lower inner wall of the grinding chamber 1. The ends of the air supply pipes 12 facing away from the grinding chamber 1 are connected to an annular sleeve 13 that can be connected to a negative or positive pressure air source. The air supply pipes 12 are arranged in a circumferential array along the axial direction of the grinding chamber 1. This allows the gas introduced into the grinding chamber 1 through the annular sleeve 13 and the air supply pipes 12 to provide kinetic energy for the floating of the material, enabling materials with the required particle size to float to the top of the grinding chamber 1 with the gas and then enter the discharge chamber through the classifier 3.

[0038] It should be noted that the end of the air supply pipe 12 embedded in the grinding chamber 1 is provided with a filter plug 14. The filter plug 14 is provided with a mesh for connecting the air supply pipe 12 and the grinding chamber 1 to prevent the grinding balls from entering. The end face of the filter plug 14 embedded in the grinding chamber 1 is smoothly connected to the inner wall of the grinding chamber 1 to avoid the filter plug 14 blocking the movement of the grinding balls.

[0039] Meanwhile, the bottom of the grinding chamber 1 and the side wall near its bottom are provided with ball discharge holes for discharging grinding balls. The ball discharge holes can be sealed by the sealing plug 15, and the end face of the sealing plug 15 embedded in the grinding chamber 1 can be smoothly connected with the inner wall of the grinding chamber 1.

[0040] Working principle: A baffle sleeve 4 is added at the top of the stirring shaft 2 and below the classifying wheel 3. The outer diameter of the baffle sleeve 4 is not less than the outer diameter of the classifying wheel 3, and a material channel is left between the outer wall of the baffle sleeve 4 and the inner wall of the grinding chamber 1. When the grinding balls jump obliquely through this gap, they will collide with the outer wall of the baffle sleeve 4 and the inner wall of the grinding chamber 1, reducing the kinetic energy of the grinding balls and making it difficult for them to cross the gap. When the grinding balls jump vertically across the gap, they will usually fall naturally due to the loss of gravitational potential energy. Some grinding balls with high kinetic energy will also reduce most of their kinetic energy after hitting the top of the grinding chamber 1, so even if they collide with the classifying wheel 3, they will not have a significant impact on the classifying wheel 3. At the same time, the two ends of the hourglass-shaped hollow tube 5 inside the baffle sleeve 4 are respectively aligned with the top of the stirring shaft 2 and the bottom of the classifying wheel 3. The grinding balls cannot pass through the hollow tube 5, and the gap between the conical baffle 6 at the top of the hollow tube 5 and the inner wall of the hollow tube 5 can be used to guide the material to diffuse circumferentially towards the classifying wheel 3, ensuring classification efficiency.

[0041] Based on the preferred embodiments of this utility model described above, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A ball mill with a classifying wheel protection function for preventing grinding balls from jumping, comprising a shell with a grinding chamber (1), wherein a classifying mechanism is provided at the top opening of the shell and capable of sealingly engaging with the grinding chamber (1), and a stirring shaft (2) for stirring grinding balls is provided at the bottom of the grinding chamber (1) along its axial direction, and a classifying wheel (3) on the classifying mechanism is suspended above the top of the stirring shaft (2), characterized in that: The grinding chamber (1) is suspended with a baffle sleeve (4) placed above the top of the stirring shaft (2) and below the classifying wheel (3). The outer diameter of the baffle sleeve (4) is greater than or equal to the outer diameter of the classifying wheel (3). A gap is reserved between the outer wall of the baffle sleeve (4) and the inner wall of the grinding chamber (1) for material to pass through. The baffle sleeve (4) is provided with an hourglass-shaped hollow tube (5). The two ends of the hollow tube (5) are respectively open towards the top of the stirring shaft (2) and the bottom of the classifying wheel (3). A conical block (6) with its tip pointing towards the inside of the hollow tube (5) is provided at the center of the opening of the end of the hollow tube (5) facing the bottom of the classifying wheel (3). A gap is reserved between the conical block (6) and the inner wall of the hollow tube (5) for material to pass through. The minimum diameter of the inner wall of the hollow tube (5) is smaller than the diameter of the grinding ball.

2. The graded wheel protective ball mill with ball-jumping interception function according to claim 1, characterized in that: The inner wall of the baffle sleeve (4) and the outer wall of the hollow tube (5) form a feeding chamber (45) that communicates with the grinding chamber (1), and the outer periphery of the baffle sleeve (4) is provided with a feeding pipe (7) that communicates with the feeding chamber (45) and extends to the outside of the grinding chamber (1). Among them, a slotted feeding port (4501) for connecting the grinding chamber (1) and the feeding chamber (45) is formed between the bottom edge of the baffle sleeve (4) and the edge of the hollow tube (5) facing the top of the stirring shaft (2).

3. The classifying wheel protective ball mill with ball-jumping interception function according to claim 1, characterized in that: The outer wall of the guard sleeve (4) is provided with a plurality of support rods (8) along its radial direction. The ends of the plurality of support rods (8) away from the guard sleeve (4) are all connected to the inner wall of the collar (9). The collar (9) can overlap on the overlapping fold (1021) provided on the inner wall of the grinding chamber (1).

4. The classifier-type ball mill with ball-jumping interception function according to claim 3, characterized in that: The housing includes a lower shell (103) for mounting the stirring shaft (2), an upper shell (101) for mounting the grading mechanism, and a middle shell (102) for connecting the upper shell (101) and the lower shell (103). The lower shell (103) and the middle shell (102) are cylindrical, and the upper shell (101) is frustoconical.

5. The classifier-type ball mill with ball-jumping interception function according to claim 4, characterized in that: The upper shell (101), the middle shell (102), and the lower shell (103) are connected by flanges.

6. The classifier-type ball mill with ball-jumping interception function according to claim 4, characterized in that: The lower shell (103) is provided with a sleeve (10) on its outer periphery. A sealed cavity is formed between the sleeve (10) and the lower shell (103), and the sleeve (10) is provided with two connectors (11) that communicate with the sealed cavity respectively.

7. The classifier-type ball mill with ball-jumping interception function according to claim 4, characterized in that: The overlapping fold (1021) is provided at the bottom edge of the middle shell (102), and the collar (9) can slide down from the top opening of the middle shell (102) to overlap the overlapping fold (1021).

8. The classifying wheel protective ball mill with ball-jumping interception function according to claim 1, characterized in that: It also includes several air supply pipes (12) that are connected to the lower inner wall of the grinding chamber (1). The ends of the several air supply pipes (12) that are away from the grinding chamber (1) are connected to an annular sleeve (13) that can be connected to a negative or positive pressure air source. The several air supply pipes (12) are arranged in a circular array along the axial direction of the grinding chamber (1).

9. The classifier-type ball mill with ball-jumping interception function according to claim 8, characterized in that: The end of the air supply pipe (12) embedded in the grinding chamber (1) is provided with a filter plug (14). The filter plug (14) is provided with a mesh for connecting the air supply pipe (12) and the grinding chamber (1), and the end face of the filter plug (14) embedded in the grinding chamber (1) is smoothly connected to the inner wall of the grinding chamber (1).

10. The classifying wheel protective ball mill with ball-jumping interception function according to claim 1, characterized in that: The bottom of the grinding chamber (1) and the side wall near its bottom are provided with ball discharge holes for discharging grinding balls. The ball discharge holes can be sealed by a sealing plug (15), and the end face of the sealing plug (15) embedded in the grinding chamber (1) can be smoothly connected with the inner wall of the grinding chamber (1).

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