Fine processing device for preparing kaolin from coal gangue

Abstract

The utility model provides a fine processing device for preparing kaolin from coal gangue. The fine processing device mainly comprises a rack, a feeding mechanism, a grinding mechanism, a plurality of deflection pressurizing mechanisms and a material returning mechanism, the rack is arranged in a plant; the feeding mechanism is arranged on the rack; the grinding mechanism is arranged on the rack to receive the coal gangue material guided from the feeding mechanism and grind the coal gangue material; the plurality of deflection pressurizing mechanisms are connected with the grinding mechanism so as to enable the grinding mechanism to form a grinding gap which periodically changes in the circumferential direction; the material returning mechanism is arranged on the periphery of the grinding mechanism and communicates with the feeding mechanism so as to conduct particle grading on the coal gangue materials ground by the grinding mechanism and send coarse materials back to the feeding mechanism. By means of the arrangement, the multiple deflection pressurizing mechanisms enable the grinding mechanism to form the grinding gaps changing in the circumferential direction, coal gangue materials can be timely pulled away by the material returning mechanism after being ground, fine materials are separated out, and the problem that the grinding device excessively grinds the coal gangue materials is solved.

Description

Technical Field

[0001] This utility model relates to the field of coal gangue processing technology, and more specifically, to a fine processing device for preparing kaolin from coal gangue. Background Technology

[0002] Coal gangue, as one of the important raw materials for the production of kaolin, usually needs to be ground before subsequent purification, calcination, or other deep processing to achieve a suitable fineness and particle size range. The grinding effect not only affects the fineness of the coal gangue material but also directly impacts subsequent grading and the quality control of kaolin products.

[0003] However, in practical applications, existing grinding equipment for preparing kaolin from coal gangue often struggles to simultaneously meet the requirements for grinding intensity and particle size control. Some equipment attempts to improve grinding efficiency by reducing the grinding gap or extending the material's residence time in the grinding zone. While this can promote further refinement of coarse particles, it can also lead to repeated grinding of already-defined fine particles, resulting in over-grinding. Over-grinding increases the proportion of fine powder, exacerbates material mudding, and broadens the particle size distribution. This not only affects subsequent classification but also negatively impacts the stable control of kaolin product quality. Utility Model Content

[0004] The main objective of this invention is to provide a fine processing device for preparing kaolin from coal gangue, so as to at least solve the problem of excessive grinding of coal gangue materials by existing grinding devices.

[0005] To achieve the above objectives, this utility model provides a fine processing device for preparing kaolin from coal gangue, comprising: a frame, which is installed inside a factory building; a feeding mechanism, which is installed on the frame for introducing coal gangue material; a grinding mechanism, which is installed on the frame for receiving the coal gangue material introduced from the feeding mechanism and grinding the coal gangue material; multiple oscillating pressure mechanisms, which are installed on the frame and connected to the grinding mechanism to form a grinding gap that changes periodically along the circumferential direction; and a return mechanism, which is installed on the outer periphery of the grinding mechanism and communicates with the feeding mechanism to classify the coal gangue material after grinding by the grinding mechanism into particles and send the coarse material back to the feeding mechanism.

[0006] Furthermore, the feeding mechanism includes: a feeding hopper, which is mounted on the frame for introducing coal gangue material; a feeding pipe, the first end of which is connected to the feeding hopper; and a corrugated pipe, the first end of which is connected to the second end of the feeding pipe, and the second end of which is connected to the feed inlet of the grinding mechanism.

[0007] Furthermore, the grinding mechanism includes: an upper grinding disc, which is horizontally arranged and connected to multiple oscillating pressure mechanisms; a lower grinding disc, which is horizontally arranged and positioned below the upper grinding disc; a drive shaft, which passes through the frame and has its first end connected to the lower grinding disc; a reducer, which is mounted on the frame and has its output end connected to the second end of the drive shaft; and a first motor, which is mounted on the frame and has its drive shaft connected to the input shaft of the reducer to drive the reducer.

[0008] Furthermore, the oscillating pressure mechanism includes: a rocker arm, the first end of which is hinged to the frame; an end face cam, which is rotatably and horizontally mounted on the frame, with its curved surface facing downwards; a roller, which is rotatably hinged to the second end of the rocker arm and abuts against the curved surface of the end face cam; a loading rod, which extends vertically, the first end of which is hinged to the waist of the rocker arm, and the second end of which is connected to the top wall of the upper grinding disc via a ball joint; and a drive component, which is mounted on the frame and connected to the end face cam to drive the end face cam to rotate; wherein, the end face cam is used to form a periodically changing axial limit on the roller by its circumferentially varying profile height, the roller is used to transmit the limiting effect of the end face cam to the rocker arm, the rocker arm is used to drive the loading rod to move vertically under the action of the material reaction force, and the loading rod is used to transmit the displacement to the upper grinding disc.

[0009] Furthermore, the oscillating pressurization mechanism also includes a guide sleeve, which passes through the frame and is fitted onto the loading rod to restrict the loading rod to move only in the vertical direction.

[0010] Furthermore, the drive component includes a gear ring fitted on the end face cam, a gear meshing with the gear ring, and a second motor for driving the gear to rotate.

[0011] Furthermore, the yaw pressurization mechanism also includes a disc spring assembly. The loading rod includes an outer rod hinged to the rocker arm and an inner rod passing through the outer rod. The disc spring assembly is sleeved on the outer rod and is axially limited and pressed by bolts screwed to the inner rod.

[0012] Furthermore, the return material mechanism includes: a dust extraction hood, which is installed outside the upper and lower grinding discs to collect the ground coal gangue material; a return pipe, the first end of which is connected to the dust extraction hood to convey the material collected by the dust extraction hood; a static classifier, which is installed on the frame and connected to the second end of the return pipe to classify the ground coal gangue material into particles; and a blower, which is connected to the static classifier to pump the ground coal gangue material to the static classifier.

[0013] Furthermore, the static classifier also includes: a coarse material pipe, which is installed on the static classifier and connected to the feeding mechanism to return the classified coarse material to the feeding mechanism; and a fine material pipe, which is installed on the static classifier and connected to the blower to discharge the classified fine material.

[0014] This utility model discloses a coal gangue-to-kaolin fine processing device, comprising: a frame, a feeding mechanism, a grinding mechanism, multiple oscillating pressure mechanisms, and a return mechanism. The frame is installed inside the plant; the feeding mechanism is mounted on the frame to introduce coal gangue material; the grinding mechanism is mounted on the frame to receive the coal gangue material introduced from the feeding mechanism and grind it; the multiple oscillating pressure mechanisms are mounted on the frame and connected to the grinding mechanism to create a periodically varying grinding gap along the circumferential direction; the return mechanism is located on the outer periphery of the grinding mechanism and communicates with the feeding mechanism to classify the ground coal gangue material into particles and return coarse material to the feeding mechanism. Through this arrangement, the multiple oscillating pressure mechanisms create a circumferentially varying grinding gap in the grinding mechanism, allowing the returned material to be promptly extracted and separated into fine particles after grinding, preventing over-grinding of fine particles and solving the problem of over-grinding of coal gangue material in the grinding device. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0016] Figure 1 This is a schematic diagram of the main structure of a coal gangue-to-kaolin fine processing device, which is an optional embodiment of this utility model.

[0017] Figure 2 This is a rear view structural schematic diagram of an optional coal gangue-to-kaolin fine processing device according to an embodiment of the present utility model;

[0018] Figure 3 This is a partial view of a coal gangue fine processing device for preparing kaolin, according to an embodiment of the present utility model.

[0019] Figure label:

[0020] 10. Frame; 11. First mounting plate; 12. Second mounting plate; 13. Third mounting plate; 14. Fourth mounting plate; 20. Feeding mechanism; 21. Feed hopper; 22. Feed pipe; 23. Corrugated pipe; 30. Grinding mechanism; 31. Upper grinding disc; 32. Lower grinding disc; 33. Drive shaft; 34. Reducer; 35. First motor; 40. Oscillating pressure mechanism; 41. Rocker arm; 42. Loading rod; 421. Outer rod; 422. Inner rod; 423. Bolt; 43. Roller; 44. End face cam; 45. Guide sleeve; 46. Disc spring assembly; 47. Drive component; 471. Gear ring; 472. Gear; 473. Second motor; 50. Return mechanism; 51. Powder extraction hood; 52. Return pipe; 53. Static classifier; 531. Coarse material pipe; 532. Fine material pipe; 54. Fan. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] like Figure 1 As shown, this utility model discloses a fine processing device for preparing kaolin from coal gangue, comprising: a frame 10, a feeding mechanism 20, a grinding mechanism 30, multiple oscillating pressure mechanisms 40, and a return mechanism 50. The frame 10 is installed inside a factory building; the feeding mechanism 20 is installed on the frame 10 for introducing coal gangue material; the grinding mechanism 30 is installed on the frame 10 to receive the coal gangue material introduced from the feeding mechanism 20 and grind the coal gangue material; the multiple oscillating pressure mechanisms 40 are installed on the frame 10 and connected to the grinding mechanism 30 to form a grinding gap that changes periodically along the circumferential direction; the return mechanism 50 is installed on the outer periphery of the grinding mechanism 30 and communicates with the feeding mechanism 20 to classify the coal gangue material after grinding by the grinding mechanism 30 and return the coarse material to the feeding mechanism 20. With the above arrangement, multiple oscillating pressure mechanisms 40 make the grinding mechanism 30 form a grinding gap that varies along the circumference. After the coal gangue material is ground, it can be promptly extracted and separated into fine materials by the return material mechanism 50, avoiding over-grinding of fine materials and solving the problem of over-grinding of coal gangue material by the grinding device.

[0023] Specifically, such as Figure 1 As shown, the frame 10 is fixedly installed on the foundation of the factory building. It is preferably made of steel sections and steel plates welded together to form a multi-layer load-bearing frame, and is connected to the foundation by anchor bolts to ensure the overall stability during operation. The frame 10 includes a first mounting plate 11, a second mounting plate 12, a third mounting plate 13 and a fourth mounting plate 14 from top to bottom. The mounting plates are fixedly connected to each other by columns, connecting plates and reinforcing ribs.

[0024] Furthermore, such as Figure 1and Figure 2 As shown, the feeding mechanism 20 includes a feeding hopper 21, a feeding pipe 22, and a corrugated pipe 23. The feeding hopper 21 is mounted on the frame 10 for introducing coal gangue material; the first end of the feeding pipe 22 is connected to the feeding hopper 21; the first end of the corrugated pipe 23 is connected to the second end of the feeding pipe 22, and the second end of the corrugated pipe 23 is connected to the inlet of the grinding mechanism 30. The feeding hopper 21 is mounted on the first mounting plate 11 of the frame 10 and can adopt a funnel-shaped structure that is larger at the top and smaller at the bottom, preferably made of wear-resistant steel plate; the first end of the feeding pipe 22 is connected to the feeding hopper 21, and the feeding pipe 22 is used to stably guide the material falling under its own weight to the downstream; the first end of the corrugated pipe 23 is connected to the second end of the feeding pipe 22, and the second end of the corrugated pipe 23 is connected to the inlet of the grinding mechanism 30. The corrugated pipe 23 preferably adopts a wear-resistant rubber corrugated flexible connection or a composite corrugated pipe structure with a metal skeleton to take into account sealing performance, flexible compensation capability, and fatigue resistance. Because the grinding mechanism 30 experiences periodic stress changes during operation, the bellows 23 can absorb relative displacement caused by assembly deviations, minor displacements, and vibrations, preventing interface cracking, material leakage, or stress concentration caused by rigid connections. With this feeding mechanism, the material's falling path is more stable, the feeding seal is better, and the transmission of vibration to the upstream hopper area is reduced.

[0025] Furthermore, such as Figure 1 and Figure 2As shown, the grinding mechanism 30 includes: an upper grinding disc 31, a lower grinding disc 32, a drive shaft 33, a reducer 34, and a first motor 35. The upper grinding disc 31 is horizontally arranged and connected to multiple oscillating pressure mechanisms 40; the lower grinding disc 32 is horizontally arranged and positioned below the upper grinding disc 31; the drive shaft 33 passes through the frame 10, and its first end is connected to the lower grinding disc 32; the reducer 34 is mounted on the frame 10, and its output end is connected to the second end of the drive shaft 33; the first motor 35 is mounted on the frame 10, and its drive shaft is connected to the input shaft of the reducer 34 to drive the reducer 34. The upper grinding disc 31 is horizontally arranged and connected to multiple oscillating pressure mechanisms 40, and mainly undertakes the function of pressure engagement in the working state; the lower grinding disc 32 is horizontally arranged and located below the upper grinding disc 31, forming the main grinding area opposite to the upper grinding disc 31. The upper grinding disc 31 and the lower grinding disc 32 preferably adopt a wear-resistant metal matrix structure, such as high-chromium cast iron, alloy steel castings, or composite parts with a wear-resistant overlay welded on the surface, to adapt to the erosion and wear caused by hard particles such as quartz in coal gangue. The drive shaft 33 is mounted on the third mounting plate 13 of the frame 10 via bearings, preferably extending in a vertical direction, and its first end is fixedly connected to the lower grinding disc 32 to drive the lower grinding disc 32 to rotate; the reducer 34 is mounted on the frame 10, and its output end is connected to the second end of the drive shaft 33, preferably mounted on the fourth mounting plate 14 to convert the high-speed, low-torque output of the motor into a low-speed, high-torque output suitable for the grinding conditions; the first motor 35 is also mounted on the frame 10, preferably mounted on the fourth mounting plate 14, and its drive shaft is connected to the input shaft of the reducer 34, thereby driving the reducer 34 to work. During operation, the first motor 35 outputs power, which is reduced and amplified by the reducer 34 before being transmitted to the drive shaft 33. The drive shaft 33 then drives the lower grinding disc 32 to rotate, and the coal gangue material is gradually refined by compression and friction between the upper and lower grinding discs. This structure can ensure stable output of the main grinding power and adapt to working conditions where the coal gangue material has high hardness and large particle size fluctuations.

[0026] Furthermore, such as Figure 1 and Figure 3As shown, the oscillating pressure mechanism 40 includes: a rocker arm 41, an end face cam 44, a roller 43, a loading rod 42, and a drive component 47. The first end of the rocker arm 41 is hinged to the frame 10; the end face cam 44 is rotatably and horizontally mounted on the frame 10, with the curved surface of the end face cam 44 facing downwards; the roller 43 is rotatably hinged to the second end of the rocker arm 41 and abuts against the curved surface of the end face cam 44; the loading rod 42 extends vertically, the first end of the loading rod 42 is hinged to the waist of the rocker arm 41, and the second end of the loading rod 42 is connected to the top wall of the upper grinding disc 31 via a ball joint; the drive component 47 is mounted on the frame 10 and connected to the end face cam 44 to drive the end face cam 44 to rotate; wherein, the end face cam 44 is used to form a periodically changing axial limit on the roller 43 by its profile height changing along the circumferential direction, the roller 43 is used to transmit the limiting effect of the end face cam 44 to the rocker arm 41, the rocker arm 41 is used to drive the loading rod 42 to move vertically under the action of the material reaction force, and the loading rod 42 is used to transmit the displacement to the upper grinding disc 31. Multiple oscillating pressure mechanisms 40 are preferably arranged in three groups evenly around the upper grinding disc 31. The main mounting area of ​​the oscillating pressure mechanism 40 is located at the second mounting plate 12, and the end face cam 44 is located above it and rotatably mounted on the first mounting plate 11. Specifically, the end face cam 44 is rotatably and horizontally mounted on the frame 10 with its curved surface facing downward. The end face cam 44 is preferably made of alloy steel that has been tempered or surface nitrided to improve the wear resistance and contact fatigue strength of the contour surface. The roller 43 is rotatably hinged to the second end of the rocker arm 41 and abuts against the curved surface of the end face cam 44. The roller 43 can adopt a rolling element structure with bearings to reduce frictional resistance. The loading rod 42 extends vertically, with its first end hinged to the waist of the rocker arm 41 and its second end connected to the top wall of the upper grinding disc 31 by a ball joint. The ball joint connection can compensate for the small angle changes generated by the upper grinding disc 31 in the oscillating state and prevent the loading rod 42 from bending. The drive component 47 is mounted on the frame 10 and connected to the end face cam 44 to drive the end face cam 44 to rotate. During operation, the curved profile of the end face cam 44 has varying heights along the circumferential direction. The roller 43 is subject to periodically varying axial limits as the end face cam 44 rotates, causing the rocker arm 41 to swing around its hinge point. This displacement change is transmitted to the upper grinding disc 31 via the loading rod 42. With the participation of the material reaction force, the upper grinding disc 31 forms a periodically varying grinding gap relative to the lower grinding disc 32 along the circumferential direction, thus creating different grinding states at different circumferential positions. By adopting this structure of cam limiting, rocker arm transmission, and loading rod output, the force on the upper grinding disc 31 can be changed from simple overall pressing to controllable sway loading, which is beneficial for improving local grinding effect and reducing excessive grinding caused by simultaneous heavy pressure around the entire circle.

[0027] Furthermore, such as Figure 1 and Figure 3As shown, the oscillating pressure mechanism 40 also includes a guide sleeve 45. The guide sleeve 45 passes through the frame 10 and is fitted onto the loading rod 42 to restrict the loading rod 42 to move only in the vertical direction. The guide sleeve 45 is preferably located on the second mounting plate 12 at a position corresponding to the loading rod 42 and is fitted onto the outer periphery of the loading rod 42. The guide sleeve 45 can adopt a sleeve-type structure, and its body should preferably be made of a high-strength metal material. The inner guide hole can be equipped with a copper-based wear-resistant sleeve, a polytetrafluoroethylene bushing, or other low-friction wear-resistant material to balance guiding accuracy and long service life. Through the constraint of the guide sleeve 45, the loading rod 42 can maintain a single vertical movement trajectory when transmitting the displacement of the end face cam 44, avoiding lateral swaying, twisting, or jamming, thereby making the oscillation process of the upper grinding disc 31 more stable, and suppressing the eccentric wear phenomenon at the connection between the rocker arm 41 and the ball joint.

[0028] Furthermore, such as Figure 1 and Figure 2 As shown, the driving component 47 includes a gear ring 471, a gear 472, and a second motor 473. The gear ring 471 is sleeved on the end face cam 44; the gear 472 meshes with the gear ring 471; the second motor 473 drives the gear 472 to rotate. The end face cam 44 is preferably specifically mounted on the first mounting plate 11. The gear ring 471 can be fixedly sleeved on the outer periphery of the end face cam 44, or it can be integrally machined with the end face cam 44 to ensure transmission concentricity; the gear 472 meshes with the gear ring 471 and is preferably mounted on the first mounting plate 11; the second motor 473 is specifically mounted on the first mounting plate 11, and its output shaft is connected to the gear 472 to drive the gear 472 to rotate and further drive the gear ring 471 and the end face cam 44 to rotate. The second motor 473 can preferably be a variable frequency motor or a servo motor to adjust the rotation speed of the end face cam 44 according to the material hardness, feed rate, and target fineness. The drive chain consisting of the second motor 473, gear 472 and gear ring 471 makes the end face cam 44 run more smoothly, and the yaw frequency and yaw period are easier to set accurately, thereby improving the flexibility of the overall machine operating condition adjustment.

[0029] Furthermore, such as Figure 1 and Figure 3As shown, the oscillating pressure mechanism 40 also includes a disc spring assembly 46. The loading rod 42 includes an outer rod 421 hinged to the rocker arm 41 and an inner rod 422 passing through the outer rod 421. The disc spring assembly 46 is sleeved on the outer rod 421 and is axially limited and tightened by bolts 423 screwed to the inner rod 422. The outer rod 421 mainly undertakes the function of connecting with the rocker arm 41 and external guidance, while the inner rod 422 undertakes the function of transmitting axial displacement to the upward grinding disc 31. The two form a telescopic fit relationship. The disc spring assembly 46 can be composed of several disc springs stacked in the same direction, combined in opposite directions, or combined in a mixed manner to obtain the required load-displacement characteristics. The disc springs can preferably be made of spring steel materials such as 60Si2MnA. By adjusting the tightness of the bolts 423, the initial preload of the disc spring assembly 46 can be set to adapt to coal gangue materials with different particle sizes and hardness. When harder particles enter the grinding zone, the instantaneous feed is too thick, or an impact load occurs, the inner rod 422 can generate a slight axial displacement relative to the outer rod 421. The disc spring assembly 46 is compressed to absorb the impact energy, and then returns to its original state with the help of elastic restoring force after the abnormal load dissipates. With the help of this telescopic buffer structure, the swaying pressure mechanism 40 has an elastic yielding function while ensuring the loading capacity, which can reduce hard impacts, improve the overall stability of the machine operation, and extend the service life of key components.

[0030] Furthermore, such as Figure 1 and Figure 2As shown, the return material mechanism 50 includes: a dust extraction hood 51, a return material pipe 52, a static classifier 53, and a blower 54. The dust extraction hood 51 is installed outside the upper grinding disc 31 and the lower grinding disc 32 to collect the ground coal gangue material; the first end of the return material pipe 52 is connected to the dust extraction hood 51 to transport the material collected by the dust extraction hood 51; the static classifier 53 is installed on the frame 10 and connected to the second end of the return material pipe 52 to classify the ground coal gangue material into particles; the blower 54 is connected to the static classifier 53 to pump the ground coal gangue material to the static classifier 53. The dust extraction hood 51 is specifically installed on the third mounting plate 13 of the frame 10, preferably adopting a shell-type or wraparound structure, and its shell can be made of wear-resistant steel plate; the first end of the return pipe 52 is connected to the dust extraction hood 51 and is used to transport the material collected by the dust extraction hood 51. The return pipe 52 is preferably a pipe structure with a smooth bend transition and wear-resistant inner wall; the static classifier 53 is set on the frame 10 and connected to the second end of the return pipe 52, preferably specifically installed on the second mounting plate 12, and is used to classify the particles of the ground coal gangue material; the blower 54 is connected to the static classifier 53 and is used to form a continuous negative pressure inside the system to draw the ground material from the dust extraction hood 51 through the return pipe 52 to the static classifier 53. The static classifier 53 uses the change of airflow direction and the difference in particle inertia to achieve coarse and fine separation. Through the return material mechanism 50, the ground material can be promptly extracted from the outer periphery of the grinding disc and sent to the grading stage, which helps to reduce dust escape and also reduces the possibility of fine material that has reached the fineness requirement remaining in the grinding zone and being repeatedly ground.

[0031] Furthermore, such as Figure 2 As shown, the static classifier 53 further includes a coarse material pipe 531 and a fine material pipe 532. The coarse material pipe 531 is disposed on the static classifier 53 and connected to the feeding mechanism 20 to return the classified coarse material to the feeding mechanism 20; the fine material pipe 532 is disposed on the static classifier 53 and connected to the blower 54 to discharge the classified fine material. The coarse material pipe 531 is preferably connected to the lower part of the feed hopper 21 or the upper part of the feed pipe 22, and can be arranged at an angle downwards so that the coarse material can smoothly return to the front end under its own weight and the negative pressure of the system; the fine material pipe 532 is disposed on the static classifier 53 and connected to the blower 54 to discharge the classified fine material, which is continuously output under the suction provided by the blower 54. During operation, larger particles or particles with strong inertia are difficult to deflect with the airflow within the static classifier 53, and therefore enter the coarse feed pipe 531 and return to the feeding mechanism 20 to participate in grinding again. Smaller particles that meet the fineness requirements enter the fine feed pipe 532 with the airflow and are conveyed and discharged by the fan 54. Through the coarse and fine feed pipes 531 and 532, the device can form a stable closed-loop grinding mode, resulting in better particle size consistency in the finished product and a lower possibility of coarse particles being entrained in the finished product.

[0032] In this embodiment, the material entering the feeding mechanism 20 is not raw large coal gangue, but intermediate coal gangue material that has already undergone prior crushing, coarse grinding, or pre-grinding. That is to say, the material entering the feeding hopper 21 and being fed into the grinding mechanism 30 through the feeding pipe 22 and the corrugated pipe 23 has already achieved a certain degree of basic refinement, and its particle size range is controlled within the range suitable for further fine grinding by this device, rather than relying on this device to directly complete the initial crushing of large-particle raw ore. The return material mechanism 50 of this device mainly relies on the negative pressure airflow generated by the blower 54 to pump the ground material from the dust extraction hood 51 to the static classifier 53 for classification. If there are too many coarse particles with excessively large particle size and weight in the material, the suspension and flow conveying capacity of these particles are poor, making them difficult to be stably extracted by the blower 54. They tend to stagnate and accumulate outside the grinding zone, thereby affecting the smoothness of the dust extraction path and the efficiency of the classification cycle. By limiting the feed of the feeding mechanism 20 to pre-ground coal gangue, the particles entering the grinding mechanism 30 can better meet the working conditions of pneumatic conveying and static classification, thereby ensuring that the ground material can be extracted in time and enter the subsequent classification circuit, making the whole machine run more smoothly, and the continuity of cyclic grinding and the fineness control of the finished product are more stable.

[0033] During operation, pre-crushed or coarsely ground coal gangue enters through the feed hopper 21 and is stably fed into the grinding area via the feed pipe 22 and the bellows pipe 23. The first motor 35 drives the lower grinding disc 32 to rotate via the reducer 34, while the upper grinding disc 31, under the action of multiple oscillating pressure mechanisms 40, forms a periodically changing grinding gap with the lower grinding disc 32. After the end face cam 44 rotates, the upper grinding disc 31 is controlled to oscillate via transmission components such as the rocker arm 41 and the loading rod 42. The material is simultaneously subjected to compression, shearing, and friction between the grinding discs, thus being further refined. The disc spring assembly 46 installed at the loading rod 42 can also release impact when encountering harder particles or instantaneous material layer fluctuations, ensuring smooth operation. After grinding, the material is thrown to the outer periphery and promptly extracted by the dust extraction hood 51 under the negative pressure generated by the blower 54, and sent to the static classifier 53. Fine particles that meet the fineness requirements are discharged through the fine material pipe 532, while coarser particles that do not meet the requirements are returned to the front end through the coarse material pipe 531 to re-enter the grinding process. Thus, the device forms a continuous closed loop of feeding, fine grinding, powder extraction, classification, and re-grinding, which can effectively grind the material while avoiding over-grinding of fine particles.

[0034] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A fine processing apparatus for preparing kaolin from coal gangue, characterized in that, include: A frame (10) is installed inside the factory building; Feeding mechanism (20), which is mounted on the frame (10) for feeding coal gangue material; A grinding mechanism (30) is disposed on the frame (10) to receive the coal gangue material introduced from the feeding mechanism (20) and to grind the coal gangue material; Multiple oscillating pressure mechanisms (40) are disposed on the frame (10) and connected to the grinding mechanism (30) so that the grinding mechanism (30) forms a grinding gap that changes periodically along the circumferential direction; The return material mechanism (50) is located on the outer periphery of the grinding mechanism (30) and communicates with the feeding mechanism (20) to classify the coal gangue material after grinding by the grinding mechanism (30) and send the coarse material back to the feeding mechanism (20).

2. The apparatus for fine processing of coal gangue into kaolin according to claim 1, characterized in that, The feeding mechanism (20) includes: Feed hopper (21), which is disposed on the frame (10) for feeding the coal gangue material; Feed pipe (22), the first end of which is connected to the feed hopper (21); A corrugated pipe (23) is provided, the first end of which is connected to the second end of the feed pipe (22), and the second end of the corrugated pipe (23) is connected to the feed inlet of the grinding mechanism (30).

3. The apparatus for fine processing of coal gangue into kaolin according to claim 1, characterized in that, The grinding mechanism (30) includes: The upper grinding disc (31) is horizontally arranged and connected to the plurality of the oscillating pressure mechanisms (40); The lower grinding disc (32) is horizontally arranged and positioned below the upper grinding disc (31); A drive shaft (33) is mounted on the frame (10), and the first end of the drive shaft (33) is connected to the lower grinding disc (32). A speed reducer (34) is mounted on the frame (10), and the output end of the speed reducer (34) is connected to the second end of the drive shaft (33); A first motor (35) is mounted on the frame (10), and the drive shaft of the first motor (35) is connected to the input shaft of the reducer (34) to drive the reducer (34).

4. The apparatus for fine processing of coal gangue into kaolin according to claim 3, characterized in that, The oscillating pressure mechanism (40) includes: A rocker arm (41), the first end of which is hinged to the frame (10); An end face cam (44) is rotatably and horizontally mounted on the frame (10), with the curved surface of the end face cam (44) facing downwards; Roller (43), which is rotatably hinged to the second end of the rocker arm (41) and abuts against the curved surface of the end face cam (44); Loading rod (42), the loading rod (42) extends vertically, the first end of the loading rod (42) is hinged to the waist of the rocker arm (41), and the second end of the loading rod (42) is connected to the top wall of the upper grinding disc (31) by ball joint; A drive component (47) is mounted on the frame (10) and connected to the end face cam (44) to drive the end face cam (44) to rotate; The end face cam (44) is used to periodically limit the roller (43) by its contour height changing along the circumferential direction. The roller (43) is used to transmit the limiting effect of the end face cam (44) to the rocker arm (41). The rocker arm (41) is used to drive the loading rod (42) to move in the vertical direction under the action of the material reaction force. The loading rod (42) is used to transmit the displacement to the upper grinding disc (31).

5. The apparatus for fine processing of coal gangue into kaolin according to claim 4, characterized in that, The oscillating pressurizing mechanism (40) also includes a guide sleeve (45), which passes through the frame (10) and is fitted onto the loading rod (42) to restrict the loading rod (42) to move only in the vertical direction.

6. The apparatus for fine processing of coal gangue into kaolin according to claim 4, characterized in that, The drive component (47) includes a gear ring (471) sleeved on the end face cam (44), a gear (472) meshing with the gear ring, and a second motor (473) for driving the gear (472) to rotate.

7. The apparatus for fine processing of coal gangue into kaolin according to claim 4, characterized in that, The oscillating pressure mechanism (40) also includes a disc spring assembly (46). The loading rod (42) includes an outer rod (421) hinged to the rocker arm (41) and an inner rod (422) passing through the outer rod (421). The disc spring assembly (46) is sleeved on the outer rod (421) and is axially limited and pressed by a bolt (423) screwed to the inner rod (422).

8. The apparatus for fine processing of coal gangue into kaolin according to claim 4, characterized in that, The material return mechanism (50) includes: A dust extraction hood (51) is installed on the outside of the upper grinding disc (31) and the lower grinding disc (32) to collect the ground coal gangue material. A return pipe (52), the first end of which is connected to the powder extraction hood (51) to transport the material collected by the powder extraction hood (51); A static classifier (53) is mounted on the frame (10) and connected to the second end of the return pipe (52) to classify the ground coal gangue material into particles. A blower (54) is connected to the static classifier (53) to pump the ground coal gangue material to the static classifier (53).

9. The apparatus for fine processing of coal gangue into kaolin according to claim 8, characterized in that, The static classifier (53) also includes: Coarse material pipe (531), which is disposed on the static classifier (53) and communicates with the feeding mechanism (20) to return the classified coarse material to the feeding mechanism (20). Fine material pipe (532) is installed on the static classifier (53) and connected to the blower (54) to discharge the classified fine material.

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