Ball mill capable of efficiently discharging and cleaning

Abstract

The utility model discloses a ball mill capable of efficiently discharging and cleaning, and belongs to the technical field of wet grinding equipment. Comprising a cylindrical grid body and a mounting plate arranged at the bottom end of the grid body, grids are uniformly distributed on the grid body, and the outer diameter of the grid body is smaller than the inner diameter of the discharging opening; at least two spacer blocks are arranged between the mounting plate and the outer wall of the cylinder body, the spacer blocks are uniformly distributed, and a gap is formed between the inner wall of the mounting plate and the outer wall of the cylinder body; a discharge hole communicated with the interior of the grating body is formed in the mounting plate; a continuous passage for discharging the slurry is formed among the inner cavity of the barrel, the grid and the discharge hole; and a continuous passage for discharging the slurry is formed among the inner cavity of the barrel, the outer wall of the grid and the inner wall of the discharge hole. The problems that an existing ball mill is low in discharging speed, incapable of effectively discharging, poor in cleaning quality and the like are solved.

Description

Technical Field

[0001] The utility model relates to a ball mill, in particular to a ball mill capable of high-efficiency discharge and cleaning, belonging to the technical field of wet grinding equipment. Background Art

[0002] The ball mill is a key equipment for crushing materials after they are broken, and it is widely used in the ball milling process of magnetic materials. Among them, in the discharge and cleaning process of the existing ball mill, compressed air is generally used as the power, that is, when discharging, the cylinder of the wet ball mill is stationary, the discharge ball valve is at the 6 o'clock position, the discharge ball valve is opened, and the compressed air is connected at the 12 o'clock position, the compressed air ball valve is opened, and the slurry in the cylinder is continuously discharged under pressure until the compressed air passes through the steel ball in the cylinder and connects to the environment and cannot build pressure, and then the compressed air ball valve is closed; when cleaning, the ball mill discharge port is moved to the 12 o'clock position, and cleaning water is added, and then the aforementioned discharge method is used again, and the water containing the slurry is discharged by the compressed air discharge method.

[0003] However, there are still the following technical problems:

[0004] 1. The existing ball mill cannot discharge the material effectively. When the cylinder of the wet ball mill is stationary, the slurry tends to adhere to the gaps between the steel balls, resulting in a slow discharge speed. In addition, the slurry on the left and right sides of the lower end of the ball mill is difficult to effectively remove. The discharge rate of this discharge method is about 80%, and about 20% of the material cannot be discharged effectively. For example, a 3-ton ball mill (3 tons of pre-burned material is ground each time) has about 600 kg of residual material, and the 600 kg of residual material is the ground material. If it enters the next round of ball milling, it will take more than 10 hours to grind it again, which wastes energy (increased load) and reduces efficiency.

[0005] Second, due to the inability to effectively discharge the material, the residual material in the cylinder is ball-milled again, making most of the particles become ultrafine particles. When the moisture content of the molding slurry needs to be controlled at 30-40%, the presence of ultrafine particles increases the difficulty of dehydration at this stage; and during molding, due to the presence of ultrafine particles, drainage is difficult, molding orientation is poor, and the magnetic properties of the product are reduced, which seriously affects the molding efficiency and product qualification rate;

[0006] 3. Due to the presence of compressed air, the existing ball mill has a pressure of up to 8 kg in the cylinder, but the cylinder is not a pressure vessel, so there is a huge safety hazard. Slurry pipeline welding often occurs, causing serious pollution to the workshop working environment.

[0007] Although the prior art CN217341640U discloses "a wet ball mill throwing and discharging mechanism", it uses the hole on the outside of the cylinder as a throwing hole, and sets a discharging device at the throwing hole, changing the traditional discharging method to throwing, using the centrifugal force generated by the rotation of the cylinder to throw out the slurry, and the discharging device is equipped with a filter screen. However, there are still problems: the discharging speed is slow, the filter screen wears out quickly, and the filter screen replacement is troublesome.

[0008] Therefore, a ball mill with fast discharging speed, high discharging rate and convenient cleaning is needed. Summary of the invention

[0009] In order to solve the problems of slow discharge speed, ineffective discharge, poor cleaning quality, etc. of the existing ball mill, a ball mill with efficient discharge and cleaning is proposed. Among them, by arranging a discharger in the discharge port, adding a spacer block between the discharger and the outer wall of the cylinder (the spacer block increases the distance between the inner wall of the mounting plate in the discharger and the outer wall of the cylinder of the ball mill), it is ensured that the slurry can be discharged from the gap between the grid on the discharger, the inner wall of the mounting plate and the outer wall of the cylinder, increasing the discharge area, thereby ensuring a fast discharge speed and a high discharge rate, while improving the cleaning efficiency, etc.

[0010] In order to achieve the above technical objectives, the following technical solutions are proposed:

[0011] A ball mill capable of efficient discharge and cleaning comprises a cylinder body arranged on a bracket, the cylinder body is connected to a driving motor through a coupling, and a reducer is connected to the output end of the driving motor; a water inlet is arranged on the top of the cylinder body, a discharge port is arranged on the bottom of the cylinder body, a discharger is arranged inside the discharge port, and the discharger is connected to the discharge port in a detachable manner;

[0012] The discharger comprises a cylindrical grid body and a mounting plate arranged at the bottom end of the grid body, the grid body is provided with evenly distributed grids, the outer diameter of the grid body is less than the inner diameter of the discharge port; at least two spacer blocks are arranged between the mounting plate and the outer wall of the cylinder, the spacer blocks are evenly distributed, and a gap is formed between the inner wall of the mounting plate and the outer wall of the cylinder; the mounting plate is provided with a discharge port connected to the inside of the grid body;

[0013] A continuous passage for slurry discharge is formed between the cylinder cavity, the grid and the discharge port;

[0014] A continuous passage for slurry discharge is formed between the pores and gaps between the inner cavity of the cylinder, the outer wall of the grid body and the inner wall of the discharge port.

[0015] Preferably, the discharger is fixed at the discharge port by a bolt assembly.

[0016] Preferably, the distance between adjacent bars in the grid body is 2-4 mm, ensuring that the grid size formed between the bars is larger than the diameter of the steel balls in the cylinder, thereby preventing the steel balls from being discharged along with the slurry during discharge.

[0017] Preferably, a handle is provided on the mounting plate to facilitate the removal and disassembly of the discharger as a whole, thereby facilitating the inspection, replacement and cleaning of the discharger.

[0018] Preferably, the height of the spacer block is 2.5-4mm, which is smaller than the diameter of the steel ball in the cylinder. For example, when grinding high-performance materials, the steel ball diameter is small, and generally a steel ball of Φ5-6mm is used, and a spacer block with a height of 2.5mm can be selected; when grinding low-end performance materials, the steel ball diameter is large, and generally a steel ball of Φ8mm is used, and a spacer block with a height of 4mm can be selected. In other words, according to the different materials being ground, spacers of different heights can be selected in a targeted manner.

[0019] Preferably, the cylinder is movably connected to the bracket, a proximity switch is provided on the cylinder, and the proximity switch is interlocked with the drive motor through an electrical signal. This arrangement allows the cylinder to perform pendulum motion, thereby improving the discharging efficiency and cleaning quality.

[0020] Preferably, a storage container is provided at the lower side of the station of the discharge port, and the storage container is connected to a storage tower through a slurry delivery pipe; a mud pump is provided on the slurry delivery pipe, and a screen is provided on the storage container and / or the mud pump; a baffle is provided on the storage container to prevent the slurry from flying.

[0021] Preferably, a rotating rod with a magnet is provided at the discharge port, and the rotating rod is movably connected to the mounting plate, so as to process the steel slag in the cleaning waste liquid discharged after the cylinder is cleaned, and the movable setting of the rotating rod can increase the movable range of the rotating rod, thereby ensuring the removal rate of the steel slag.

[0022] The relationships involving "upper", "top", "bottom", "inside", "between", "bottom end", "outside", "inside", "rear side of the workstation", "directly above", and "lower side of the workstation" in this technical solution are defined according to the situations under actual usage conditions and are conventional terms in this technical field, and are also conventional terms used by technical personnel in this field in actual use.

[0023] The beneficial technical effects brought about by adopting this technical solution are:

[0024] 1. The ball mill provided by the utility model has reasonable design, simple structure, convenient operation, and can effectively improve the discharge rate (realize 100% material discharge); at the same time, it can greatly improve the cleaning efficiency of the steel balls in the cylinder and reduce water consumption, that is, save water resources;

[0025] 2. In the present invention, a discharger is sleeved in the discharge port, and a spacer block is added between the discharger and the outer wall of the cylinder (the spacer block increases the distance between the inner wall of the mounting plate in the discharger and the outer wall of the cylinder of the ball mill), so that the slurry can be discharged from the gap between the grid on the discharger, the inner wall of the mounting plate and the outer wall of the cylinder, thereby increasing the discharge area, thereby ensuring a fast discharge speed and a high discharge rate, and at the same time improving the cleaning efficiency (increased by 60%), etc.;

[0026] 3. In the present invention, due to the fast discharge speed, the grinding effect is avoided to be aggravated, and the iron particles after grinding are prevented from being quickly oxidized to ferric oxide, that is, impurities are reduced, and the magnetic properties and pressure resistance of subsequent products are effectively guaranteed. In addition, the present invention has a high discharge rate, reduces the amount of material residue, and thus avoids the formation of ultrafine particles, effectively guarantees the magnetic properties of subsequent products, and improves the molding efficiency and product qualification rate in the subsequent processing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is the front view (I) of the utility model;

[0028] Figure 2 This is the main view of the utility model (II)

[0029] Figure 3 It is a three-dimensional diagram of the utility model;

[0030] Figure 4 It is a side view of the utility model;

[0031] Figure 5 It is a bottom view of the utility model;

[0032] Figure 6 This is a schematic diagram of the installation of the discharger in the utility model;

[0033] Figure 7 It is a top view of the mounting plate in the utility model;

[0034] Figure 8 It is a bottom view of the grille body in the utility model;

[0035] Fig. 9 This is a schematic diagram of the arrangement of the ball mill in the utility model;

[0036] In the figure, 1, bracket, 2, cylinder, 21, water inlet, 22, discharge port, 23, discharger, 231, grid body, 232, mounting plate, 233, spacer block, 234, handle, 24, proximity switch, 3, coupling, 4, drive motor, 5, reducer, 6, grid, 7, gap, 8, discharge port, 9, bolt assembly, 10, grid bar, 11, storage tower, 12, storage device, 13, slurry delivery pipe, 14, mud pump, 15, baffle, 16, rotating rod. DETAILED DESCRIPTION

[0037] The following is a clear and complete description of the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] The inventors found in the ball milling process of magnetic materials that there is a significant difference in the pressure resistance characteristics of subsequent permanent ferrite component products between small-scale laboratory tests and large-scale production tests, which is closely related to the grinding process of magnetic materials.

[0039] Taking the existing 3-ton ball mill as an example, it takes about 20 minutes to discharge the material; after the discharge is completed, the discharge port is moved from the 6 o'clock position to the 12 o'clock position, and the cleaning water is introduced for about 1-2 minutes, and the cleaning time is about 15 minutes per time. The conventional grinding process is calculated as 2 cleanings, and the existing ball mill discharges and cleans for a total of about 1 hour, which leads to low production efficiency of the magnetic material ball milling process. Furthermore, the height and length of the protruding ball mill cylinder and the residual slurry in the arc area formed by the inner wall of the cylinder are difficult to be effectively discharged, and the residual material still has a certain impact on the quality of the magnetic material product (the residual material is ground again to form ultrafine particles);

[0040] In addition, taking the existing ball mill of 3 tons as an example, according to the traditional process material: steel ball = 1:4, the steel balls in the ball mill are 12 tons. When the ball mill discharges materials for a certain period of time, the friction between the steel balls and the collision between the steel balls and the inner wall of the cylinder intensifies the grinding action, and the ground iron particles are quickly oxidized to ferric oxide, which cannot guarantee the subsequent effective cleaning; and if the cleaning times are too many, more cleaning waste liquid will be generated; excessive ferric oxide mixed into the slurry will cause the content of divalent iron in the subsequent permanent magnet ferrite components to increase, thereby causing the permanent magnet ferrite's withstand voltage characteristics to deteriorate.

[0041] Example 1

[0042] The utility model provides: a ball mill capable of efficient discharge and cleaning, comprising a cylinder 2 arranged on a bracket 1, the cylinder 2 is connected to a drive motor 4 through a coupling 3, and a reducer 5 is connected to the output end of the drive motor 4; Figure 1-5 As shown, a water inlet 21 is provided at the top of the cylinder 2, a discharge port 22 is provided at the bottom of the cylinder 2, a discharger 23 is provided inside the discharge port 22, and the discharger 23 is detachably connected to the discharge port 22;

[0043] like Figure 5As shown, the discharger 23 includes a cylindrical grid body 231 and a mounting plate 232 arranged at the bottom end of the grid body 231. The grid body 231 has evenly distributed grids 6 ( Figure 8 ), the outer diameter of the grid body 231 is less than the inner diameter of the discharge port 22; at least two spacer blocks 233 are provided between the mounting plate 232 and the outer wall of the cylinder 2, and the spacer blocks 233 are evenly distributed, and a gap 7 is formed between the inner wall of the mounting plate 232 and the outer wall of the cylinder 2; Figure 7 As shown, the mounting plate 232 is provided with a discharge port 8 which is in communication with the interior of the grid body 231;

[0044] A continuous passage for discharging slurry is formed between the inner cavity of the cylinder 2, the grid 6 and the discharge port 8; a continuous passage for discharging slurry is formed between the inner cavity of the cylinder 2, the outer wall of the grid body 231 and the inner wall of the discharge port 22, and the pores and gaps 7.

[0045] Among them, according to actual needs, the water inlet 21 can be set just above the discharge port 22.

[0046] The working process involved in the ball mill includes:

[0047] 1. Put the material to be ground into the cylinder 2, drive the motor 4 to provide power, make the cylinder 2 rotate, and the steel balls in the cylinder 2 provide friction, thereby grinding the material to form slurry;

[0048] 2. After grinding, move the discharge port 22 to the 6 o'clock position, open the discharge port 22, and the slurry is discharged from the inner cavity of the cylinder 2, the grid 6, the discharge port 8, the pores between the outer wall of the grid body 231 and the inner wall of the discharge port 22, and the gap 7;

[0049] 3. After the discharge is completed, add cleaning water into the cylinder 2 from the water inlet 21, and switch the ball mill to the normal operation state. Start the machine for 1-2 minutes, and rub and clean the cylinder wall of the cylinder 2 at the 12 o'clock direction of the ball mill with steel balls.

[0050] Example 2

[0051] On the basis of Example 1, this example further limits the installation of the discharger 23 to further illustrate the technical solution.

[0052] The discharger 23 is fixed to the discharge port 22 by a bolt assembly 9, wherein the bolt assembly 9 specifically includes a nut and a bolt / nut. By setting the disassembly mode, it is convenient to take the discharger 23 out of the discharge port 22, and then facilitate the subsequent maintenance, replacement and cleaning.

[0053] Example 3

[0054] On the basis of Embodiment 1-2, this embodiment further limits the size of the grid 6 to further illustrate the technical solution.

[0055] The distance between adjacent bars 10 in the grid body 231 is 2-4 mm, ensuring that the size of the grid 6 formed between the bars 10 is larger than the diameter of the steel balls in the cylinder 2, thereby preventing the steel balls from being discharged along with the slurry during discharge; at the same time, it also facilitates the discharge of the slurry, effectively increases the discharge speed, and achieves effective discharge.

[0056] Example 4

[0057] On the basis of embodiments 1-3, this embodiment further defines the mounting plate 232 to further illustrate the technical solution.

[0058] A handle 234 is provided on the mounting plate 232 to facilitate the removal and disassembly of the discharger 23 as a whole, thereby facilitating the inspection, replacement and cleaning of the discharger 23 .

[0059] Example 5

[0060] On the basis of embodiments 1-4, this embodiment further defines the spacer block 233 to further illustrate the technical solution.

[0061] The height of the spacer block 233 is 2.5-4mm, which is smaller than the diameter of the steel ball in the cylinder 2. For example, when grinding high-performance materials, the steel ball diameter is small, and generally a steel ball of Φ5-6mm is used, and a spacer block with a height of 2.5mm can be selected; when grinding low-end performance materials, the steel ball diameter is large, and generally a steel ball of Φ8mm is used, and a spacer block with a height of 4mm can be selected. In other words, according to the different materials to be ground, spacers of different heights can be selected in a targeted manner.

[0062] The spacer block 233 may be a gasket.

[0063] Example 6

[0064] On the basis of Examples 1-5, this example further defines the installation and connection relationship between the cylinder 2 and the bracket 1 to further illustrate the technical solution.

[0065] In the ball milling process of magnetic materials, the inventors found that the existing ball mill basically does not discharge materials when the material is discharged from the discharge port 22 at 9 o'clock to 15 o'clock, and the most effective discharge direction is from 5 o'clock to 7 o'clock. Therefore, the ball mill cylinder 2 is designed to make a pendulum motion when discharging materials at the bottom, and the swing amplitude is controlled to be from 4 o'clock to 8 o'clock of the discharge port 22, preferably from 5 o'clock to 7 o'clock of the discharge port 22, and the proximity switch 24 set on the cylinder 2 is used to control the forward and reverse start and stop of the drive motor 4 to achieve this. At the same time, the cylinder 2 is also controlled to make a pendulum motion during cleaning.

[0066] That is, the cylinder 2 is movably connected to the bracket 1. Specifically, with the bracket 1 as a reference, the cylinder 2 can perform rotational motion and pendulum motion. Also, a proximity switch 24 is provided on the cylinder 2, and the proximity switch 24 is interlocked with the drive motor 4 through an electrical signal. This setting allows the cylinder 2 to perform pendulum motion, thereby improving the discharge efficiency and cleaning quality.

[0067] Example 7

[0068] On the basis of Examples 1-6, this example further limits the arrangement of the ball mill to further illustrate the technical solution.

[0069] like Fig. 9 As shown, a storage container 12 is provided at the lower side of the station of the discharge port 22, and the storage container 12 is connected to the storage tower 11 through a slurry conveying pipe 13; a mud pump 14 is provided on the slurry conveying pipe 13, and a screen is provided on the mud pump 14 and / or the storage container 12; a baffle 15 for preventing the slurry from flying is provided on the storage container 12.

[0070] The storage device 12 plays a good role in connection and buffering, that is, it ensures that the slurry discharged from the discharge port 22 enters the storage tower 11 smoothly, stably and controllably.

[0071] Example 8

[0072] On the basis of Examples 1-7, in order to improve the cleaning quality and efficiency of the ball mill and facilitate the subsequent treatment of the cleaning waste liquid, this example further defines:

[0073] A rotating rod 16 with a magnet is provided at the discharge port 22, and the rotating rod 16 is movably connected to the mounting plate 232. The rotating rod 16 is used to process the steel slag in the cleaning waste liquid discharged after the cylinder 2 is cleaned; and the movable setting of the rotating rod 16 can increase the movable range of the rotating rod 16, thereby ensuring the removal rate of the steel slag.

Claims

1. A ball mill capable of efficient discharge and cleaning, comprising a cylinder (2) arranged on a support (1), the cylinder (2) being connected to a drive motor (4) via a coupling (3), the output end of the drive motor (4) being connected to a reducer (5), characterized in that: The top of the cylinder (2) is provided with a water inlet (21), the bottom of the cylinder (2) is provided with a discharge port (22), a discharger (23) is sleeved inside the discharge port (22), and the discharger (23) is connected to the discharge port (22) in a detachable manner; The discharger (23) comprises a cylindrical grid body (231) and a mounting plate (232) arranged at the bottom end of the grid body (231); grids (6) are evenly distributed on the grid body (231); the outer diameter of the grid body (231) is smaller than the inner diameter of the discharge port (22); at least two spacer blocks (233) are arranged between the mounting plate (232) and the outer wall of the cylinder (2); the spacer blocks (233) are evenly distributed; a gap (7) is formed between the inner wall of the mounting plate (232) and the outer wall of the cylinder (2); and the mounting plate (232) is provided with a discharge port (8) that is in communication with the interior of the grid body (231); A continuous passage for discharging slurry is formed between the inner cavity of the cylinder (2), the grid (6) and the discharge port (8); A continuous passage for discharging slurry is formed between the inner cavity of the cylinder (2), the outer wall of the grid body (231) and the inner wall of the discharge port (22), and between the pores and the gap (7).

2. The ball mill capable of efficient discharge and cleaning according to claim 1, characterized in that: The discharger (23) is fixed at the discharge port (22) via a bolt assembly (9).

3. The ball mill capable of efficient discharge and cleaning according to claim 1, characterized in that: The distance between adjacent bars (10) in the grid body (231) is 2-4 mm.

4. The ball mill capable of efficient discharge and cleaning according to claim 1, characterized in that: A handle (234) is provided on the mounting plate (232).

5. The ball mill capable of efficient discharge and cleaning according to claim 1, characterized in that: The height of the spacer block (233) is 2.5-4 mm.

6. The ball mill capable of efficient discharge and cleaning according to claim 1, characterized in that: The cylinder (2) and the bracket (1) are movably connected, a proximity switch (24) is provided on the cylinder (2), and the proximity switch (24) and the drive motor (4) are interlocked via an electrical signal.

7. The ball mill capable of efficient discharge and cleaning according to claim 1, characterized in that: A material storage container (12) is provided at the lower side of the station of the discharge port (22), and the material storage container (12) is connected to a material storage tower (11) via a slurry delivery pipe (13); a slurry pump (14) is provided on the slurry delivery pipe (13), and a screen is provided on the material storage container (12) and / or the slurry pump (14); and a baffle (15) for preventing slurry from scattering is provided on the material storage container (12).

8. The ball mill capable of efficient discharge and cleaning according to claim 1, characterized in that: A rotating rod (16) with a magnet is provided at the discharge port (22), and the rotating rod (16) is movably connected to the mounting plate (232).

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