Method and equipment for efficiently preparing inorganic non-metallic material product larger than 1600 meshes through dry method

Abstract

The invention relates to the technical field of inorganic non-metallic material superfine grinding, in particular to a method and equipment for efficiently preparing an inorganic non-metallic material product larger than 1600 meshes through a dry method.The equipment comprises a superfine classifier, a device rack, a driving motor and a control box, and a ball milling barrel is rotationally installed on the device rack; rotating shafts are fixedly installed at the two ends of the ball milling barrel, a negative pressure suction and conveying mechanism is installed at a right side end opening of the device rack, the output end of the negative pressure suction and conveying mechanism is connected with a discharging end opening, and the discharging end opening is connected with the input end of the superfine classifier; through a collaborative process system of three-stage progressive grinding, gradient screening, precise sorting of an ultrafine classifier and closed-loop backflow regrinding, and in combination with optimal configuration of a grinding medium and a filling rate, the problem of non-uniform granularity of a traditional grinding product is solved, and it is ensured that a final product stably reaches 1600 meshes or above, and the granularity is uniform.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ultra-fine grinding of inorganic non-metallic materials, in particular to a method and equipment for efficiently preparing inorganic non-metallic material products with more than 1600 mesh by dry method. BACKGROUND

[0002] Inorganic non-metallic materials include quartz, calcium carbonate, kaolin, talc and many other types, and their performance and application value depend largely on the fineness of the powder. When the powder fineness reaches the ultra-fine level, it will exhibit a series of excellent properties, such as a significant increase in specific surface area, a significant improvement in surface activity, and excellent filling and dispersing properties. These properties make ultra-fine inorganic non-metallic material powder widely and importantly used in many fields, including high-grade coatings, plastic and rubber products, precision ceramic manufacturing, electronic packaging technology, cosmetic research and development, and development of special functional materials.

[0003] In the preparation of ultra-fine powder, a ball mill is a commonly used core equipment. The ball mill is a cylindrical grinding equipment, and its grinding media are usually steel balls or ceramic balls. In operation, the ball mill relies on the rotation of the cylinder to drive the grinding body to move, and through the impact and grinding action of the grinding body on the material, the blocky or particulate material is gradually crushed and ground to the pre-set particle size, thereby achieving ultra-fine grinding and homogenization of the material.

[0004] However, most of the existing dry preparation equipment adopts a monolithic grinding chamber design, making it difficult to perform a classification process on the raw materials during grinding. The monolithic grinding chamber not only produces relatively coarse particles when grinding materials, but also easily leads to insufficient grinding of the material, resulting in the presence of coarse particles in the product or the generation of excessive ultra-fine powder, thereby causing the product particle size distribution to be unsatisfactory and seriously affecting the quality and performance of the product. Therefore, we propose a method and equipment for efficiently preparing inorganic non-metallic material products with more than 1600 mesh by dry method. SUMMARY

[0005] The present application relates to the technical field of ultra-fine grinding of inorganic non-metallic materials, in particular to a method and equipment for efficiently preparing inorganic non-metallic material products with more than 1600 mesh by dry method.

[0006] The object of the present application can be achieved by the following technical solutions: An equipment for the efficient dry preparation of inorganic non-metallic materials larger than 1600 mesh includes: an ultrafine classifier, a frame, a drive motor, and a control box. A ball mill cylinder is rotatably mounted on the frame, and rotating shafts are fixedly mounted at both ends of the ball mill cylinder. A negative pressure suction mechanism is installed at the right port of the frame, and the output end of the negative pressure suction mechanism is connected to a discharge port, which is connected to the input end of the ultrafine classifier. The input end of the negative pressure suction mechanism is connected to the ball mill cylinder, and a feed port is connected to the left side of the ball mill cylinder. The qualified material output end of the ultrafine classifier is used to collect materials of 1600 mesh and above, and the unqualified material output end of the ultrafine classifier is connected to the feed port. A grinding mechanism is assembled inside the ball mill cylinder. The grinding mechanism includes a coarse grinding chamber, a medium grinding chamber, a fine grinding chamber, and a pretreatment discharge chamber arranged sequentially along the material conveying direction. The grinding mechanism is used for classifying and grinding inorganic non-metallic materials. A screening mechanism is installed between the coarse grinding chamber, the medium grinding chamber, the fine grinding chamber, and the pretreatment discharge chamber. Several flow rate regulating mechanisms for adjusting the material flow rate are arranged sequentially along the material conveying direction inside the grinding mechanism. An anti-blocking mechanism for preventing clogging is installed inside the screening mechanism.

[0007] Preferably, the screening mechanism includes a coarse screening plate, a fine screening plate, and a pretreatment screening plate. Each of the coarse screening plate, fine screening plate, and pretreatment screening plate includes a mounting frame. Each of the coarse screening plate, fine screening plate, and pretreatment screening plate is fixedly installed on the inner wall of the grinding mechanism through the mounting frame. Each of the coarse screening plate, fine screening plate, and pretreatment screening plate has a plurality of screening holes. The mounting frame has a plurality of mounting grooves. The diameter of the screening holes of the coarse screening plate, fine screening plate, and pretreatment screening plate decreases sequentially. The diameter of the screening holes of the coarse screening plate is 8-10 mm, the diameter of the screening holes of the fine screening plate is 5-7 mm, and the diameter of the screening holes of the pretreatment screening plate is 3-4 mm.

[0008] Preferably, the inner side of the mounting bracket is provided with four mounting slots arranged in a circumferential array, and the inner side of each mounting slot is equipped with an anti-blocking mechanism.

[0009] Preferably, the anti-blocking mechanism includes a mounting block, a sliding rod, a telescopic spring, and an annular impact block. The mounting block is fixedly installed at both the upper and lower ends of the inner wall of the mounting groove. The sliding rod is fixedly installed at the upper end of the mounting block. The upper and lower ends of the sliding rod are fitted with telescopic springs. The annular impact block is slidably installed on the outer wall of the sliding rod near the upper end of the telescopic spring. The two ends of the telescopic spring abut against the mounting block and the annular impact block, respectively.

[0010] Preferably, the flow rate regulating mechanism includes a liner, a mounting base, a hydraulic rod, a flow deflector, and a transmission connecting rod. The inner wall of the grinding mechanism has several mounting grooves, and a hydraulic oil channel is fitted through the inner side of each mounting groove. Several liners are circumferentially arranged on the inner wall of the grinding mechanism. A mounting base is fitted in each mounting groove, and a hydraulic rod is fixedly mounted on the upper surface of each mounting base. The bottom end of each hydraulic rod communicates with the hydraulic oil channel. A flow deflector is fixedly mounted on the extended end of each hydraulic rod. A transmission connecting rod is movably connected between the liner and the flow deflector, and the flow deflector is movably disposed on the surface of the liner.

[0011] Preferably, the grinding media in the coarse grinding chamber, medium grinding chamber, and fine grinding chamber are, in order, large-diameter steel balls, medium-diameter steel balls, and small-diameter ceramic balls. The particle size ranges of the large-diameter steel balls, medium-diameter steel balls, and small-diameter ceramic balls are 50mm-90mm, 30mm-50mm, and 12mm-30mm, respectively. The filling rate of the grinding media in the coarse grinding chamber, medium grinding chamber, and fine grinding chamber increases sequentially along the material conveying direction, and the filling rate ranges are 25%-30%, 30%-35%, and 35%-40%, respectively.

[0012] Preferably, the control box is electromechanically connected to the drive motor, the negative pressure suction mechanism, the flow rate adjustment mechanism and the ultra-fine classification mechanism, respectively. The flow baffles are evenly distributed along the arc direction of the liner, and the surface of the flow baffles is provided with wear-resistant protrusions.

[0013] Preferably, the rotating shaft is a hollow shaft structure, the negative pressure value of the negative pressure suction and conveying mechanism can be adjusted by the control box, and the sorting accuracy of the ultrafine classifier can be set to 1600 mesh or above by the control box.

[0014] The present invention also provides a method for dry and efficient preparation of inorganic non-metallic material products larger than the mesh size, comprising: S1, raw material conveying: the inorganic non-metallic material raw material to be ground is put into the feed port, and the negative pressure suction mechanism is started by controlling the box to send the raw material into the coarse grinding chamber of the ball mill cylinder by using negative pressure suction. S2. Grading and Pre-treatment Grinding: The drive motor is started to rotate the ball mill cylinder. The coarse grinding chamber is filled with large-diameter steel balls with a particle size of 50mm-90mm, with a filling rate of 25%-30%. The raw material is first coarsely ground in the coarse grinding chamber. After being screened by the adjacent coarse screening plate, the qualified material enters the intermediate grinding chamber. The intermediate grinding chamber is filled with medium-diameter steel balls with a particle size of 30mm-50mm, with a filling rate of 30%-35%. The material undergoes intermediate grinding in the intermediate grinding chamber. After being screened by the adjacent fine particle screening plate, the qualified material... Material enters the fine grinding chamber, which is filled with small-diameter ceramic balls with a particle size of 12mm-30mm, with a filling rate of 35%-40%. The material undergoes fine grinding in the fine grinding chamber. After being screened by an adjacent pre-treatment screening plate, the qualified material enters the pre-treatment discharge chamber, the discharge end of which is connected to the input end of the ultrafine classifier. During the grinding process, the flow rate of the material in each grinding chamber is controlled by adjusting the position of the baffle plate of the flow rate adjustment mechanism in the control box, ensuring that the material is fully ground to the required fineness. S3. Grading, sorting and recirculation: After the ultrafine classifier is started, the pre-treated material in the pre-treatment discharge chamber is sorted. Qualified materials with a fineness of 1600 mesh and above are collected through their qualified material output end, while unqualified materials with a fineness of less than 1600 mesh are transported to the feed port 32 through their unqualified material output end. S4. Anti-clogging screening: During the screening process of pretreatment grinding, materials that do not pass through the corresponding screening plate are subjected to reciprocating impact by the annular impact block of the anti-clogging mechanism at the screening mechanism under the action of the telescopic spring. This prevents the coarse screening plate, fine particle screening plate and pretreatment screening plate included in the screening mechanism from clogging, avoiding blockage of the screening holes opened in the coarse screening plate, fine particle screening plate and pretreatment screening plate. At the same time, materials that do not meet the standards can undergo secondary pretreatment grinding in the corresponding grinding chamber under the dual action of the negative pressure suction mechanism and the rotation of the ball mill cylinder. S5. Finished Product Discharge: The qualified materials of 1600 mesh and above collected after being sorted by the ultrafine classifier are completed.

[0015] The beneficial effects of this invention are: 1. This invention effectively solves the problems of low efficiency, uneven particle size, and coarse particle residue caused by direct impact grinding of 1600 mesh by constructing a collaborative process system of ball mill cylinder pretreatment grinding, ultrafine classifier precise sorting, and closed-loop reflux regrinding. The ball mill cylinder, through the combination of coarse grinding chamber, medium grinding chamber and fine grinding chamber in a three-stage progressive grinding chamber with gradient-matched grinding media of large-diameter steel balls, medium-diameter steel balls and small-diameter ceramic balls, first stably grinds the material to the required pretreatment fineness, laying a uniform particle size foundation for the subsequent precise sorting of the ultrafine classifier, significantly reducing the sorting load of the classifier, and improving the output efficiency and purity of qualified products of 1600 mesh and above. It effectively solves the problems of coarse product particle size, coarse particles or excessive ultrafine powder in traditional integral grinding chambers, ensuring that the final product can stably reach the required fineness and that the powder particle size distribution is uniform, significantly improving the application value of the product.

[0016] 2. This invention uses a circumferential array of anti-clogging mechanisms assembled in the mounting slot of the screening mechanism. Under the combined action of the telescopic spring and the centrifugal force of the ball mill cylinder, the annular impact blocks can perform flexible reciprocating impacts on the screening plate, thereby preventing the screening holes from clogging at the source and reducing downtime for cleaning due to equipment blockage. At the same time, substandard materials can be returned to the corresponding grinding chamber for secondary grinding under the dual action of negative pressure airflow and the rotation of the ball mill cylinder, improving the utilization rate of raw materials and shortening the overall preparation cycle. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the ball mill cylinder of the present invention; Figure 3 This is a cross-sectional schematic diagram of the internal structure of the ball mill cylinder of the present invention; Figure 4 This is a first-view schematic diagram of the internal structure of the grinding mechanism of the present invention; Figure 5 This is a second-view schematic diagram of the internal structure of the grinding mechanism of the present invention; Figure 6 This is a third-view schematic diagram of the internal structure of the grinding mechanism of the present invention; Figure 7 This is a magnified first-view schematic diagram of the screening mechanism structure of the present invention; Figure 8 This is a magnified second-view schematic diagram of the screening mechanism structure of the present invention; Figure 9 This is an enlarged schematic diagram of the anti-blocking mechanism structure of the present invention.

[0018] The following are the reference numerals in the attached diagram: 1. Device frame; 2. Drive motor; 3. Ball mill cylinder; 31. Rotating shaft; 32. Discharge port; 33. Feed port; 4. Negative pressure suction mechanism; 5. Control box; 6. Screening mechanism; 61. Coarse screening plate; 62. Fine particle screening plate; 63. Pretreatment screening plate; 64. Mounting frame; 65. Screening holes; 66. Mounting groove; 7. Grinding mechanism; 71. Coarse grinding chamber; 72. Medium grinding chamber; 73. Fine particle grinding chamber; 74. Pretreatment discharge chamber; 75. Mounting groove; 76. Hydraulic oil channel; 8. Flow rate adjustment mechanism; 81. Liner; 82. Mounting seat; 83. Hydraulic rod; 84. Baffle plate; 85. Transmission connecting rod; 9. Anti-blocking mechanism; 91. Mounting block; 92. Slide rod; 93. Telescopic spring; 94. Annular impact block. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1: As Figures 1-9 As shown, a method and equipment for the efficient dry preparation of inorganic non-metallic materials with a mesh size greater than 1600 mesh includes: an ultrafine classifier, a device frame 1, a drive motor 2, and a control box 5. A ball mill cylinder 3 is rotatably mounted on the device frame 1. Rotating shafts 31 are fixedly mounted at both ends of the ball mill cylinder 3. A negative pressure suction mechanism 4 is installed at the right port of the device frame 1. The output end of the negative pressure suction mechanism 4 is connected to a discharge port 32, which is connected to the input end of the ultrafine classifier. The input end of the negative pressure suction mechanism 4 is connected to the ball mill cylinder 3. A feed port 33 is connected to the left side of the ball mill cylinder 3. The qualified material output end of the ultrafine classifier is used to collect materials with a mesh size of 1600 mesh and above. The unqualified material output end of the ultrafine classifier is connected to the feed port 33. A grinding mechanism 7 is assembled inside the ball mill cylinder 3. The grinding mechanism 7 includes a coarse grinding chamber 71, a medium grinding chamber 72, a fine grinding chamber 73, and a pretreatment discharge chamber 74, which are arranged sequentially along the material conveying direction. The grinding mechanism 7 is used to classify and grind inorganic non-metallic materials. A screening mechanism 6 is installed between the coarse grinding chamber 71, the medium grinding chamber 72, the fine grinding chamber 73, and the pretreatment discharge chamber 74. Several flow rate regulating mechanisms 8 for adjusting the material flow rate are arranged sequentially along the material conveying direction inside the grinding mechanism 7. An anti-blocking mechanism 9 for preventing blockage is installed inside the screening mechanism 6.

[0021] In practice, the device frame 1 serves as the main support structure; the drive motor 2 provides power for the rotation of the ball mill cylinder 3; the control box 5 is used for centralized control of various electrical components; the ball mill cylinder 3 is rotatably mounted on the frame via rotating shafts 31 at both ends; the rotatable connection between the rotating shafts 31 and the device frame 1 ensures the stable rotation of the ball mill cylinder 3; the negative pressure suction mechanism 4 realizes the directional conveying of materials from the ball mill cylinder 3 to the ultrafine classifier; the discharge port 32 and the feed port 33 respectively undertake the functions of discharge and feed; together with the ultrafine classifier, a closed-loop system of grinding, grading, and non-conforming return is formed to ensure that the final product reaches 1600 mesh or above. The standard adopts a segmented design with three-stage grinding and one-stage pre-treatment discharge, which is suitable for the processing needs of materials from coarse to fine. The coarse grinding chamber 71, medium grinding chamber 72, and fine grinding chamber 73 advance along the material conveying direction to gradually improve the grinding accuracy. The pre-treatment discharge chamber 74 is used to pre-regulate the material entering the ultrafine classifier. The screening mechanism 6 is used to separate the chambers to ensure that the material reaches the corresponding grinding accuracy before entering the next chamber. The flow rate adjustment mechanism 8 can flexibly control the residence time of the material in each chamber according to the grinding progress to ensure sufficient grinding. The anti-blocking mechanism 9 solves the problem of material blockage during the screening process and improves the stability of continuous operation of the equipment.

[0022] As a technical optimization of the present invention, the screening mechanism 6 includes a coarse screening plate 61, a fine particle screening plate 62, and a pretreatment screening plate 63. Each coarse screening plate 61, fine particle screening plate 62, and pretreatment screening plate 63 includes a mounting frame 64. Each coarse screening plate 61, fine particle screening plate 62, and pretreatment screening plate 63 is fixedly installed on the inner wall of the grinding mechanism 7 through the mounting frame 64. Each coarse screening plate 61, fine particle screening plate 62, and pretreatment screening plate 63 is provided with a plurality of screening holes 65. The mounting frame 64 is provided with a plurality of mounting grooves 66. The diameter of the screening holes 65 of the coarse screening plate 61, fine particle screening plate 62, and pretreatment screening plate 63 decreases sequentially. The diameter of the screening holes of the coarse screening plate 61 is 8-10 mm, the diameter of the screening holes of the fine particle screening plate 62 is 5-7 mm, and the diameter of the screening holes of the pretreatment screening plate 63 is 3-4 mm.

[0023] In practice, the coarse screening plate 61, the fine screening plate 62, and the pretreatment screening plate 63 respectively separate the coarse grinding chamber 71 from the medium grinding chamber 72, the fine grinding chamber 73 from the pretreatment discharge chamber 74, and are fixed to the inner wall of the grinding mechanism 7 by the mounting bracket 64. The mounting groove 66 provides an assembly position for the anti-clogging mechanism 9. The aperture of the screening holes 65 decreases sequentially, corresponding to the gradual increase in the grinding precision of the material. The aperture ranges of 8-10mm, 5-7mm, and 3-4mm are respectively adapted to the screening requirements of the material after coarse, medium, and fine grinding, ensuring that the particle size of the material entering the next chamber meets the requirements of the corresponding grinding stage and avoiding the impact of excessively large particle size on the subsequent grinding efficiency.

[0024] As a technical optimization of the present invention, the inner side of the mounting bracket 64 is provided with four mounting slots 66 arranged in a circumferential array, and the inner side of each mounting slot 66 is equipped with an anti-blocking mechanism 9.

[0025] In practice, the mounting grooves 66 of the inner circumferential array of the mounting frame 64 allow the anti-blocking mechanism 9 to be evenly distributed around the circumference of the screening plate, achieving all-round anti-blocking coverage of the coarse screening plate 61, fine particle screening plate 62, and pretreatment screening plate 63, avoiding the decrease in screening efficiency caused by the blockage of local screening holes 65. At the same time, the arrangement of the circumferential array is adapted to the rotation direction of the ball mill cylinder 3, and the centrifugal force of the cylinder rotation can be used to assist the anti-blocking mechanism 9 in playing its role.

[0026] As a technical optimization of the present invention, the anti-blocking mechanism 9 includes a mounting block 91, a sliding rod 92, a telescopic spring 93, and an annular impact block 94. The mounting block 91 is fixedly installed at both the upper and lower ends of the inner wall of the mounting groove 66. The sliding rod 92 is fixedly installed at the upper end of the mounting block 91. The telescopic spring 93 is sleeved at both the upper and lower ends of the sliding rod 92. The annular impact block 94 is slidably installed on the outer wall of the sliding rod 92 near the upper end of the telescopic spring 93. The two ends of the telescopic spring 93 abut against the mounting block 91 and the annular impact block 94, respectively.

[0027] In specific implementation, the mounting block 91 provides fixed support for the slide bar 92, and the slide bar 92 plays a guiding and limiting role in the lifting and sliding of the annular impact block 94; the telescopic springs 93 at the upper and lower ends of the slide bar 92 can realize the elastic reset of the annular impact block 94. When the ball mill cylinder 3 rotates, the annular impact block 94 can reciprocate to impact the screening plate under the combined action of centrifugal force and spring force. Its annular structure can cover multiple screening holes 65 at the same time, improving the anti-clogging efficiency, and the flexible impact will not cause structural damage to the coarse screening plate 61, fine particle screening plate 62, and pretreatment screening plate 63.

[0028] As a technical optimization of the present invention, the flow rate regulating mechanism 8 includes a liner 81, a mounting base 82, a hydraulic rod 83, a flow deflector 84, and a transmission connecting rod 85. The inner wall of the grinding mechanism 7 is provided with a plurality of mounting grooves 75. A hydraulic oil channel 76 is installed through the inner side of each mounting groove 75. A plurality of liners 81 are installed in a circumferential array on the inner wall of the grinding mechanism 7. A mounting base 82 is installed in each mounting groove 75. A hydraulic rod 83 is fixedly installed on the upper end surface of each mounting base 82. The bottom end of the hydraulic rod 83 is connected to the hydraulic oil channel 76. A flow deflector 84 is fixedly installed on the extended end of the hydraulic rod 83. A transmission connecting rod 85 is movably connected between the liner 81 and the flow deflector 84. The flow deflector 84 is movably disposed on the surface of the liner 81.

[0029] In practice, the mounting groove 75 provides a concealed installation space for the mounting base 82 and the hydraulic rod 83, avoiding collision with the grinding media. The hydraulic oil channel 76 provides a stable hydraulic power source for the hydraulic rod 83. The liner 81 protects the inner wall of the grinding mechanism 7 from wear by the grinding media, and the mounting base 82 ensures the installation stability of the hydraulic rod 83. The transmission linkage 85 enables the linkage between the hydraulic rod 83 and the baffle plate 84. The extension and retraction of the hydraulic rod 83 drives the baffle plate 84 to move on the surface of the liner 81, thereby changing the flow path and residence time of the material and achieving precise control of the flow rate at different grinding stages.

[0030] As a technical optimization of the present invention, the grinding media in the coarse grinding chamber 71, the medium grinding chamber 72, and the fine grinding chamber 73 are, in order, large-diameter steel balls, medium-diameter steel balls, and small-diameter ceramic balls. The particle size ranges of the large-diameter steel balls, medium-diameter steel balls, and small-diameter ceramic balls are 50mm-90mm, 30mm-50mm, and 12mm-30mm, respectively. The filling rate of the grinding media in the coarse grinding chamber 71, the medium grinding chamber 72, and the fine grinding chamber 73 increases sequentially along the material conveying direction, and the filling rate ranges are 25%-30%, 30%-35%, and 35%-40%, respectively.

[0031] In specific implementation, the coarse grinding chamber 71 uses large-diameter steel balls of 50mm-90mm to crush large raw materials using their weight and impact force. The low filling rate of 25%-30% provides sufficient space for the raw materials to move. The medium grinding chamber 72 uses medium-diameter steel balls of 30mm-50mm to further refine the material after coarse grinding. The filling rate of 30%-35% balances grinding efficiency and material flowability. The fine grinding chamber 73 uses small-diameter ceramic balls of 12mm-30mm to achieve high-precision grinding while avoiding metal contamination. The higher filling rate of 35%-40% improves the fine grinding effect. The gradient design of grinding media and filling rate realizes efficient connection between coarse crushing, fine grinding and fine grinding, laying the foundation for the preparation of products of 1600 mesh and above.

[0032] As a technical optimization of the present invention, the control box 5 is electromechanically connected to the drive motor 2, the negative pressure suction mechanism 4, the flow rate adjustment mechanism 8 and the ultra-fine classification mechanism, respectively. The flow baffle 84 is evenly distributed along the arc direction of the liner 81, and the surface of the flow baffle 84 is provided with wear-resistant protrusions.

[0033] In practice, the centralized electrical connection of the control box 5 can realize the automated linkage control of the speed of the drive motor 2, the negative pressure value of the negative pressure suction mechanism 4, and the extension and retraction of the hydraulic rod 83 of the flow rate adjustment mechanism 8, thereby improving the intelligence level of the equipment; the baffle plate 84 is distributed along the arc of the liner plate 81 to adapt to the rotation trajectory of the ball mill cylinder 3, making the material flow rate adjustment more uniform; the wear-resistant protrusions on the surface of the baffle plate 84 can enhance the contact friction with the material, while extending the service life of the baffle plate 84 and reducing the wear caused by the impact of the grinding media. Meanwhile, the control box 5, as the core control unit, achieves centralized control of the ball mill speed, the suction force of the negative pressure suction mechanism 4, the position of the baffle plate of the flow rate adjustment mechanism 8, and the sorting accuracy of the ultrafine classifier through the drive motor 2, ensuring the coordinated operation of all components. The baffle plate 84 is evenly distributed along the arc of the liner plate 81 to ensure uniform adjustment of the material flow rate. The wear-resistant protrusions on the surface can enhance the wear resistance of the baffle plate 84, adapt to the harsh working conditions in the grinding chamber 7, and extend the service life of the components.

[0034] As a technical optimization of the present invention, the rotating shaft 31 is a hollow shaft structure, the negative pressure value of the negative pressure suction and conveying mechanism 4 can be adjusted by the control box 5, and the sorting accuracy of the ultrafine classifier can be set to 1600 mesh or above by the control box 5.

[0035] In practical implementation, the rotating shaft 31 adopts a hollow shaft structure to carry hydraulic oil pipes, wires and other supporting pipelines, making the equipment structure more compact and avoiding the pipeline from getting tangled as the ball mill cylinder 3 rotates. At the same time, it can assist in the conveying of some airflow and materials. The negative pressure value of the negative pressure suction mechanism 4 can be adjusted by the control box 5 to adapt to the conveying needs of inorganic non-metallic materials with different flowability. The sorting accuracy of the ultrafine classifier can be precisely set to 1600 mesh and above, and supports fine adjustment according to actual product needs to ensure that the particle size of qualified materials meets the standards and improves the stability of product quality.

[0036] Its usage method includes: S1, raw material conveying: raw material conveying: put the inorganic non-metallic material to be ground into the feed port 33, start the negative pressure suction mechanism 4 through the control box 5, and use the negative pressure suction to send the raw material into the coarse grinding chamber 71 of the ball mill cylinder 3; S2. Grading and Pre-treatment Grinding: The drive motor 2 is started to rotate the ball mill cylinder 3. The coarse grinding chamber 71 is filled with large-diameter steel balls with a particle size of 50mm-90mm, with a filling rate of 25%-30%. The raw material is first coarsely ground in the coarse grinding chamber 71. After being screened by the adjacent coarse screening plate 61, the qualified material enters the intermediate grinding chamber 72. The intermediate grinding chamber 72 is filled with medium-diameter steel balls with a particle size of 30mm-50mm, with a filling rate of 30%-35%. The material undergoes intermediate grinding in the intermediate grinding chamber 72. After being screened by the adjacent fine particle screening plate 62, the qualified material... The material enters the fine grinding chamber 73, which is filled with small ceramic balls with a particle size of 12mm-30mm, with a filling rate of 35%-40%. The material is finely ground in the fine grinding chamber 73. After being screened by the adjacent pretreatment screening plate 63, the qualified material enters the pretreatment discharge chamber 74. The discharge end of the pretreatment discharge chamber 74 is connected to the input end of the ultrafine classifier. During the grinding process, the flow rate of the material in each grinding chamber is controlled by adjusting the position of the baffle plate 84 of the flow rate adjustment mechanism 8 through the control box 5, so as to ensure that the material is fully ground to the required fineness. S3. Grading, sorting and recirculation: After the ultrafine classifier is started, the pre-treated material in the pre-treatment discharge chamber 74 is sorted. Qualified materials with a fineness of 1600 mesh or above are collected through their qualified material output end, while unqualified materials with a fineness of less than 1600 mesh are transported to the feed port 32 through their unqualified material output end. S4. Anti-clogging screening: During the screening process of pretreatment grinding, materials that do not pass through the corresponding screening plate are subjected to reciprocating impact of the annular impact block 94 of the anti-clogging mechanism 9 on the screening plate at the screening mechanism 6 under the action of the telescopic spring 93. This prevents the screening plate 61, fine particle screening plate 62 and pretreatment screening plate 63 included in the screening mechanism 6 from clogging, avoiding blockage of the screening holes 65 opened in the coarse screening plate 61, fine particle screening plate 62 and pretreatment screening plate 63. At the same time, materials that do not meet the standards can be subjected to secondary pretreatment grinding of the materials in the corresponding grinding chamber under the dual action of the negative pressure suction mechanism 4 and the rotation of the ball mill cylinder 3. S5. Finished Product Discharge: The qualified materials of 1600 mesh and above collected after being sorted by the ultrafine classifier are completed.

[0037] Working principle: First, the inorganic non-metallic material to be ground is fed into the feed port 33 on the left side of the ball mill cylinder 3. The negative pressure suction mechanism 4 is activated via the control box 5, which is electrically connected to the drive motor 2 and the negative pressure suction mechanism 4. The adjustable negative pressure suction forces the material into the coarse grinding chamber 71 inside the ball mill cylinder 3, which is rotatably mounted on the device frame 1. The control box 5 then activates the drive motor 2, causing the ball mill cylinder 3 to rotate stably via the hollow rotating shafts 31 at both ends. The 50mm-90mm large-diameter steel balls filling the coarse grinding chamber 71, with a filling rate of 25%-30%, generate impact and grinding force as the cylinder rotates, coarsely crushing the material. After being screened by the coarse screening plate 61 between the coarse grinding chamber 71 and the medium grinding chamber 72, the qualified material enters the medium grinding chamber 72, where it undergoes fine grinding by being filled with 30mm-50mm medium-diameter steel balls at a filling rate of 30%-35%. After further screening by the fine particle screening plate 62, the qualified material enters the fine particle grinding chamber. The grinding chamber 73 is filled with ceramic balls of small diameter (12mm-30mm) at a rate of 35%-40% for fine grinding. After being screened by the pretreatment screening plate 63, the material enters the pretreatment discharge chamber 74. During the grinding process, the flow rate adjustment mechanism 8 on the inner wall of the control box 5 adjusts the flow rate adjustment mechanism 7. The hydraulic oil channel 76 provides power to the hydraulic rod 83 in the mounting groove 75. The hydraulic rod 83 drives the flow baffle 84 on the surface of the liner 81 to move through the transmission connecting rod 85, accurately controlling the flow rate of the material in each chamber. At the same time, the anti-blocking mechanism 9 on the mounting frame 64 of the screening mechanism 6 works synchronously. The annular impact block 94, under the action of centrifugal force generated by the rotation of the cylinder on the slide rod 92 and the elastic force of the extension spring 93, reciprocates to impact the coarse screening plate 61, fine screening plate 62, and pretreatment screening plate 63, preventing the screening holes 65 from being blocked. The substandard material flows back to the corresponding grinding chamber for secondary grinding under the dual action of negative pressure and cylinder rotation. Secondly, the material in the pre-treatment discharge chamber 74 is conveyed by the negative pressure suction mechanism 4 to the ultrafine classifier connected to the input end through the discharge port 32 connected to the right side of the ball mill cylinder 3. The sorting accuracy of the ultrafine classifier is preset to 1600 mesh and above by the control box 5. Its working principle is based on the centrifugal force and air resistance classification method. The ultrafine classifier is equipped with a high-speed rotating classifying wheel and a guide channel. After the material enters the classification chamber, it moves with the airflow under the drive of the negative pressure airflow, and is simultaneously subjected to the centrifugal force generated by the rotation of the classifying wheel, so that the particle size reaches 1600 mesh and above. The qualified ultrafine powder, due to its light weight and small particle size, experiences greater air resistance than centrifugal force, thus overcoming the centrifugal force to pass through the gap between the blades of the classifying wheel and enter the qualified material output end along the guide channel for collection. On the other hand, the coarse particles that do not reach 1600 mesh, due to their large weight and large particle size, experience greater centrifugal force than air resistance and are thrown by the classifying wheel against the inner wall of the classifying chamber. They slide down the chamber wall to the unqualified material output end and then flow back to the ball mill cylinder 3 through the connecting pipe with the feed port 33, re-entering the coarse grinding chamber 71 to participate in the classifying and grinding process, forming a closed-loop grinding system. Finally, throughout the entire screening and grading process, the four anti-clogging mechanisms 9 arranged in a circular array on the mounting frame 64 of the screening mechanism 6 continue to work. The sliding rod 92 fixed by the mounting block 91 provides guidance for the annular impact block 94. The elastic reset action of the telescopic spring 93 causes the impact block to continuously strike the screening plate, completely avoiding clogging of the screening holes 65, reducing downtime for cleaning, and the control box 5 coordinates in real time the speed of the drive motor 2, the negative pressure value of the negative pressure suction mechanism 4, the flow rate adjustment mechanism 8, and the sorting parameters of the ultrafine classifier to ensure that all components operate in synergy. After multiple closed-loop grinding and grading, the qualified material output end of the ultrafine classifier continuously collects inorganic non-metallic material products with a particle size of 1600 mesh and above and uniform particle size, completing the entire preparation process.

[0038] Comparative example: The difference between this comparative example and Example 1 is that a non-grading ordinary ball mill was used, along with the ultrafine classifier used in Example 1, to prepare quartz powder with a mesh size greater than 1600 mesh.

[0039] Ball mill model: Φ1800×3000 ordinary grid-type ball mill (without external grading system).

[0040] Main unit power: 110kW, total installed power: 132kW.

[0041] Cylinder rotation speed: 28 r / min, effective volume: 6.5 m³ 3 .

[0042] Discharge method: discharge via grate sieve, without fine powder separation device. Working principle: First, the inorganic non-metallic raw materials after crushing and pretreatment are fed into the cylinder of a common grid-type ball mill through the feed inlet. After the feed inlet is closed, the equipment drive component is started. The cylinder rotates at a set speed under the drive of the motor. The grinding media loaded inside generates impact, collision and grinding forces with the movement of the cylinder, crushing and grinding the raw materials mixed together in the cylinder. Since the equipment has no graded grinding chamber design, all raw materials are always in the same grinding space, and there is no staged particle size screening and precise grinding adaptation. Secondly, after the preset continuous grinding time, the ball mill outlet is opened, and the material is initially screened by the grid plate inside the cylinder, so that the ground material is discharged from the gap of the grid plate. Then, the discharged material is separated a second time by manually operating a 1600-mesh standard sieve to screen out the fine powder that meets the fineness requirements and collect it. The coarse particles that do not pass through the standard sieve are temporarily stored. During this process, the fine powder cannot be separated from the grinding system in time and is easy to continue to mix and grind with the coarse particles, resulting in over-fineness. At the same time, the coarse particles are also difficult to quickly return to regrinding. Finally, the coarse particles collected after manual screening are returned to the ball mill cylinder through the feed inlet, repeating the above cycle of feeding, grinding, discharging, and manual screening until a sufficient amount of fine powder product meeting the requirements is obtained. However, due to the lack of an automatic grading and closed-loop reflux mechanism, the entire process relies on manual intervention to recover coarse powder. Furthermore, the particle size of the material cannot be accurately controlled during the grinding process, which can easily lead to problems such as coarse particle residue, over-grinding of fine powder, or uneven particle size distribution, resulting in low grinding efficiency and high energy consumption.

[0043] Results analysis: The material produced in this comparative example using the working principle of the ungraded ordinary ball mill shows that the ordinary ball mill's cylinder speed, media ratio, and liner structure are designed for coarse grinding, resulting in extremely low ultrafine grinding efficiency. Without an external high-efficiency classification system, fine powder cannot be separated from the grinding system in a timely manner, leading to over-grinding of fine powder and increased media wear. This not only causes a surge in energy consumption but also introduces impurities for contamination. At the same time, relying on manual sieving to separate fine powder is cumbersome and inefficient. Multiple cycles of grinding further reduce production capacity, ultimately resulting in difficulty in achieving a fineness greater than 1600 mesh, extremely low production capacity, extremely high energy consumption, and decreased product purity, making it impossible to achieve efficient preparation of quartz powder greater than 1600 mesh.

[0044] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. An apparatus for the efficient dry preparation of inorganic non-metallic materials with a mesh size greater than 1600, comprising: An ultrafine classifier, a device frame (1), a drive motor (2), and a control box (5) are characterized in that a ball mill cylinder (3) is rotatably mounted on the device frame (1), and a rotating shaft (31) is fixedly mounted at both ends of the ball mill cylinder (3). A negative pressure suction mechanism (4) is installed at the right port of the device frame (1), and the output end of the negative pressure suction mechanism (4) is connected to a discharge port (32). The discharge port (32) is connected to the input end of the ultrafine classifier. The input end of the negative pressure suction mechanism (4) is connected to the ball mill cylinder (3). A feed port (33) is connected to the left side of the ball mill cylinder (3). The qualified material output end of the ultrafine classifier is used to collect materials of 1600 mesh and above. The unqualified material output end of the ultrafine classifier is connected to the feed port (33). A grinding mechanism (7) is assembled on the inner side of the ball mill cylinder (3). The grinding mechanism (7) includes a coarse grinding chamber (71), a medium grinding chamber (72), a fine grinding chamber (73), and a pretreatment discharge chamber (74) arranged sequentially along the material conveying direction. The grinding mechanism (7) is used to grade and grind inorganic non-metallic materials. A screening mechanism (6) is installed between the coarse grinding chamber (71), the medium grinding chamber (72), the fine grinding chamber (73), and the pretreatment discharge chamber (74). Several flow rate regulating mechanisms (8) for adjusting the material flow rate are arranged sequentially along the material conveying direction inside the grinding mechanism (7). An anti-blocking mechanism (9) for preventing blockage is installed inside the screening mechanism (6).

2. The equipment for the efficient dry preparation of inorganic non-metallic materials with a mesh size greater than 1600, as described in claim 1, is characterized in that... The screening mechanism (6) includes a coarse screening plate (61), a fine screening plate (62), and a pretreatment screening plate (63). Each of the coarse screening plate (61), fine screening plate (62), and pretreatment screening plate (63) includes a mounting frame (64). Each of the coarse screening plate (61), fine screening plate (62), and pretreatment screening plate (63) is fixedly mounted on the inner wall of the grinding mechanism (7) through the mounting frame (64). Each of the coarse screening plate (61), fine screening plate (62), and pretreatment screening plate (63) is fixedly mounted on the inner wall of the grinding mechanism (7) through the mounting frame (64). The coarse screening plate (61), the fine screening plate (62), and the pretreatment screening plate (63) are provided with a number of screening holes (65), and the mounting frame (64) is provided with a number of mounting grooves (66). The diameter of the screening holes (65) of the coarse screening plate (61), the fine screening plate (62), and the pretreatment screening plate (63) decreases in sequence. The diameter of the screening holes of the coarse screening plate (61) is 8-10 mm, the diameter of the screening holes of the fine screening plate (62) is 5-7 mm, and the diameter of the screening holes of the pretreatment screening plate (63) is 3-4 mm.

3. The equipment for the efficient dry preparation of inorganic non-metallic materials with a mesh size greater than 1600, as described in claim 2, is characterized in that... The mounting bracket (64) has four mounting slots (66) arranged in a circumferential array on its inner side, and each mounting slot (66) is equipped with an anti-blocking mechanism (9) on its inner side.

4. The equipment for the efficient dry preparation of inorganic non-metallic materials with a mesh size greater than 1600, as described in claim 3, is characterized in that... The anti-blocking mechanism (9) includes a mounting block (91), a sliding rod (92), a telescopic spring (93), and an annular impact block (94). The mounting block (91) is fixedly installed on the upper and lower ends of the inner wall of the mounting groove (66). The sliding rod (92) is fixedly installed on the upper end of the mounting block (91). The telescopic spring (93) is sleeved on both the upper and lower ends of the sliding rod (92). The annular impact block (94) is slidably installed on the outer wall of the sliding rod (92) near the upper end of the telescopic spring (93). The two ends of the telescopic spring (93) abut against the mounting block (91) and the annular impact block (94) respectively.

5. The equipment for the efficient dry preparation of inorganic non-metallic materials with a mesh size greater than 1600, as described in claim 1, is characterized in that... The flow rate regulating mechanism (8) includes a liner (81), a mounting base (82), a hydraulic rod (83), a flow deflector (84), and a transmission connecting rod (85). The inner wall of the grinding mechanism (7) is provided with several mounting grooves (75). A hydraulic oil channel (76) is installed through the inner side of each mounting groove (75). Several liners (81) are installed in a circumferential array on the inner wall of the grinding mechanism (7). A mounting base (82) is installed in each mounting groove (75). A hydraulic rod (83) is fixedly installed on the upper end face of each mounting base (82). The bottom end of the hydraulic rod (83) is connected to the hydraulic oil channel (76). A flow deflector (84) is fixedly installed on the extended end of the hydraulic rod (83). A transmission connecting rod (85) is movably connected between the liner (81) and the flow deflector (84). The flow deflector (84) is movably disposed on the surface of the liner (81).

6. The equipment for the efficient dry preparation of inorganic non-metallic materials with a mesh size greater than 1600, as described in claim 1, is characterized in that... The grinding media in the coarse grinding chamber (71), medium grinding chamber (72), and fine grinding chamber (73) are, in order, large-diameter steel balls, medium-diameter steel balls, and small-diameter ceramic balls. The particle size ranges of the large-diameter steel balls, medium-diameter steel balls, and small-diameter ceramic balls are 50mm-90mm, 30mm-50mm, and 12mm-30mm, respectively. The filling rate of the grinding media in the coarse grinding chamber (71), medium grinding chamber (72), and fine grinding chamber (73) increases sequentially along the material conveying direction. The filling rate ranges are 25%-30%, 30%-35%, and 35%-40%, respectively.

7. The equipment for the efficient dry preparation of inorganic non-metallic materials with a mesh size greater than 1600, as described in claim 5, is characterized in that... The control box (5) is electrically connected to the drive motor (2), the negative pressure suction mechanism (4), the flow rate adjustment mechanism (8) and the ultra-fine classification, respectively. The flow baffle (84) is evenly distributed along the arc direction of the liner (81), and the surface of the flow baffle (84) is provided with wear-resistant protrusions.

8. The equipment for the efficient dry preparation of inorganic non-metallic materials with a mesh size greater than 1600, as described in claim 1, is characterized in that... The rotating shaft (31) is a hollow shaft structure. The negative pressure value of the negative pressure suction and conveying mechanism (4) can be adjusted by the control box (5). The sorting accuracy of the ultrafine classifier can be set to 1600 mesh or above by the control box (5).

9. A method for the efficient dry preparation of inorganic non-metallic material products with a mesh size greater than 1600, implemented using the equipment described in any one of claims 1-8, characterized in that, Includes the following steps: S1. Raw material conveying: The inorganic non-metallic material to be ground is put into the feed port (33), and the negative pressure suction mechanism (4) is started by controlling the box (5) to send the material into the coarse grinding chamber (71) of the ball mill cylinder (3) using negative pressure suction. S2. Grading and Pre-treatment Grinding: Start the drive motor (2) to drive the ball mill cylinder (3) to rotate. The coarse grinding chamber (71) is filled with large-diameter steel balls with a particle size of 50mm-90mm, with a filling rate of 25%-30%. The raw material is first coarsely ground in the coarse grinding chamber (71). After being screened by the adjacent coarse screening plate (61), the qualified material enters the medium grinding chamber (72). The medium grinding chamber (72) is filled with medium-diameter steel balls with a particle size of 30mm-50mm, with a filling rate of 30%-35%. The material is then ground in the medium grinding chamber. The grinding chamber (72) performs intermediate grinding; after being screened by the adjacent fine particle screening plate (62), the qualified material enters the fine particle grinding chamber (73), which is filled with small-diameter ceramic balls with a particle size of 12mm-30mm and a filling rate of 35%-40%. The material is finely ground in the fine particle grinding chamber (73); after being screened by the adjacent pretreatment screening plate (63), the qualified material enters the pretreatment discharge chamber (74), and the discharge end of the pretreatment discharge chamber (74) is connected to the input end of the ultrafine classifier. During the grinding process, the flow rate of the material in each grinding chamber is controlled by adjusting the position of the baffle plate (84) of the flow rate adjustment mechanism (8) through the control box (5), so as to ensure that the material is fully ground to the required fineness. S3, Grading, Sorting and Recirculation: After the ultrafine grader is started, the pre-treated material in the pre-treatment discharge chamber (74) is sorted. Qualified materials with a fineness of 1600 mesh or above are collected through their qualified material output end, while unqualified materials with a fineness of less than 1600 mesh are transported to the feed port (32) through their unqualified material output end. S4. Anti-clogging screening: During the screening process of pretreatment grinding, the material that does not pass through the corresponding screening plate is subjected to reciprocating impact on the screening plate by the annular impact block (94) of the anti-clogging mechanism (9) under the action of the telescopic spring (93) at the screening mechanism (6). This prevents the coarse screening plate (61), fine particle screening plate (62) and pretreatment screening plate (63) included in the screening mechanism (6) from being blocked, thus avoiding the clogging of the screening holes (65) opened by the coarse screening plate (61), fine particle screening plate (62) and pretreatment screening plate (63). At the same time, the material that does not meet the standard can be subjected to secondary pretreatment grinding of the material in the corresponding grinding chamber under the dual action of the negative pressure suction conveying mechanism (4) and the rotation of the ball mill cylinder (3). S5. Finished Product Discharge: The qualified materials of 1600 mesh and above collected after being sorted by the ultrafine classifier are completed.

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