Multi-unit independently-driven pulverizer for rotary grinding of roller sleeves of grinding rollers

Abstract

The invention discloses a multi-unit independently-driven pulverizer for rotary grinding of a roller sleeve of a grinding roller, and belongs to the technical field of pulverizing equipment. The pulverizer comprises a shell, a disc body and a plurality of driving grinding rollers surrounding the disc body, and each driving grinding roller forms an independent unit. The transmission shaft is connected with the driving device through a universal coupling; the rear end of the supporting ring is hinged through a knuckle bearing; the grinding roller sleeve is mounted at the front end of the supporting ring through a supporting bearing; and the connecting flange is connected with the transmission shaft and the grinding roller sleeve. The driving device drives the grinding roller sleeve to actively rotate through power; the transmission shaft is supported in the supporting ring through the self-aligning bearing, so that the transmission shaft only transmits driving torque, and grinding pressure and swing are borne by the supporting ring. According to the invention, the physical separation of torque transmission and pressure bearing is realized, the specifications of the transmission shaft and the bearing are obviously reduced, the cost is reduced, meanwhile, the rigidity, the operation stability and the unbalance loading resistance of the system are greatly improved, and the device is particularly suitable for efficient and stable grinding of fine materials.

Description

Technical Field

[0001] This invention belongs to the technical field of grinding equipment, and particularly relates to a grinding mill with multi-unit independently driven grinding roller sleeves for rotary grinding. Background Technology

[0002] Grinding is a crucial process in mining, metallurgy, building materials, and new energy material preparation. Vertical roller mills (vertical mills) are widely used due to their bed-grinding principle, offering advantages such as large throughput, high grinding efficiency, and relatively low energy consumption. Traditional vertical mills typically use a motor at the bottom to drive the grinding disc, which in turn rotates the upper grinding rollers based on the friction between the disc and the material, thus crushing and grinding the material.

[0003] However, this traditional "grinding disc active, grinding roller passive" driving mode has inherent defects. When processing materials with extremely high fineness requirements (such as those required in the new energy industry) or materials with low friction, the frictional driving force between the grinding disc and the material is insufficient, making it difficult to effectively drive the grinding roller to rotate. This can lead to the grinding roller "slipping" or even stopping, causing abnormal equipment vibration, a sharp drop in grinding efficiency, and an increase in unit power consumption, making it impossible to meet the stable production needs of fine and ultrafine powders.

[0004] To overcome the above problems, existing technologies have proposed an "active grinding roller" approach. For example, existing technology (publication number: CN105435912B) discloses a "roller mill with a main drive grinding roller and a friction-driven grinding disc." This technical solution directly drives the roller shaft of the grinding roller unit to rotate via a universal coupling, enabling the grinding roller to actively crush the material, and the friction of the material drives the grinding disc to rotate passively. This method reduces the dependence on friction and improves the stability of grinding fine materials. However, this solution still has significant limitations: as the core transmission component, the roller shaft must not only transmit the driving torque but also withstand the enormous grinding pressure (bending moment) from the pressurizing device through the pressure bearing assembly in its middle. This combined torque and pressure force the roller shaft to be designed to be very robust, and the matching pressure bearing assembly and hinge bearing assembly are large in size and numerous, resulting in high manufacturing costs and complex structures. More importantly, the tangential sway force generated during the grinding process is easily transmitted to the hinge support device through the roller shaft, posing a risk of "jamming" at the hinge point, affecting the operational reliability of the system and the feasibility of large-scale applications.

[0005] Therefore, how to fundamentally solve the problems of high cost and poor reliability caused by the composite force of transmission components while inheriting the advantages of "active grinding rollers" and design a new type of grinding mill that is compact in structure, stable in operation, easy to scale up and has controllable manufacturing cost has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] To address the problems existing in the prior art, this invention provides a multi-unit independently driven grinding mill that physically separates the transmission of driving torque from the bearing of grinding pressure in its structure. This solves the technical problems of high manufacturing cost, poor operational reliability, and difficulty in large-scale production caused by the transmission shaft bearing both torque and bending moment simultaneously in existing active grinding roller technology.

[0007] This invention is implemented as follows: A multi-unit independently driven grinding roller sleeve rotary grinding mill includes a housing, a disc disposed within the housing, and multiple drive grinding roller units arranged around the disc. The disc is mounted on a fixed base via a grinding disc rotation support assembly and can passively rotate. A classifier is mounted on the upper part of the housing, and an air inlet duct communicating with the classifier is provided on the housing. The mill is characterized in that each drive grinding roller unit constitutes an independent grinding roller sleeve drive unit, which includes: a drive device; a transmission shaft, one end of which is connected to the output end of the drive device via a universal coupling; a support ring, the rear end of which is hinged to a fixed base via a spherical bearing, allowing the support ring to swing up and down around the spherical bearing; a grinding roller sleeve, rotatably supported at the front end of the support ring via at least two support bearings; and a connecting flange, which fixes the other end of the transmission shaft to the grinding roller sleeve. The power of the drive device is transmitted sequentially through the universal coupling, the transmission shaft, and the connecting flange, driving the grinding roller sleeve to rotate actively around its own axis. The transmission shaft is supported within the support ring via a self-aligning bearing, allowing the transmission shaft to transmit only the driving torque.

[0008] A further preferred embodiment includes a limiting seat, which is fixedly installed, and the support ring passes through the limiting seat and can slide up and down along it. The limiting seat is used to limit the lateral swing of the support ring.

[0009] In a further preferred embodiment, the limiting seat has a U-shaped opening through which the support ring passes, and a limiting seat cover is provided above the limiting seat; a sealing gasket is provided between the limiting seat and the grinding roller sleeve, and the sealing gasket fits into the opening on the housing.

[0010] In a further preferred embodiment, a hydraulic cylinder pull lug seat is provided in the middle of the support ring; the grinding mill also includes a hydraulic cylinder, one end of which is hinged to the hydraulic cylinder pull lug seat, and the other end is hinged to a hydraulic cylinder hinge shaft base provided on a fixed base.

[0011] A further preferred embodiment of the grinding disc rotation support assembly includes: a support base fixed on a fixed base; a load-bearing turntable supported on the support base by a thrust bearing, with the disc body fixedly installed on the load-bearing turntable; and a fixed shaft supported at its upper and lower ends by self-aligning bearings within a bearing housing, with the bearing housing fixedly connected to the support base, and the load-bearing turntable fixedly sleeved on the fixed shaft.

[0012] In a further preferred embodiment, the fixing seat is mounted on the spherical bearing bracket, and the spherical bearing bracket is fixed on the fixing base.

[0013] In a further preferred embodiment, the two side walls of the U-shaped opening of the limiting seat slide in contact with the outer peripheral surface of the support ring.

[0014] In a further preferred embodiment, the sealing gasket is fixedly disposed on the side of the limiting seat facing the grinding roller sleeve.

[0015] In a further preferred embodiment, the rod end of the hydraulic cylinder is hinged to the hydraulic cylinder pull lug seat via a pin.

[0016] In a further preferred embodiment, the bearing housing is fixedly connected to the support base via a connecting plate.

[0017] The advantages and technical effects of this invention are as follows: Compared with the prior art, this invention achieves significant overall technical progress through revolutionary structural reconstruction, specifically in the following ways:

[0018] This invention achieves physical decoupling of torque transmission and pressure bearing, significantly reducing the cost and size of core components: Existing rollers require a dual function, bearing both torque and bending moment. This invention creatively distinguishes the functions of the "drive shaft" and the "support ring." The drive shaft, supported within the support ring by self-aligning bearings, is dedicated to transmitting drive torque and bears virtually no bending moment generated by grinding pressure; all grinding pressure, yaw force, and oscillation are handled by the independent support ring through its end joint bearings and limit seats. This fundamental design allows for a significant reduction in the diameter of the drive shaft, requiring only small-sized self-aligning bearings and support bearings at both ends. Compared to existing technologies that require large, heavy-duty bearing assemblies, the cost, weight, and space occupied by the core transmission and load-bearing components are greatly reduced.

[0019] Significantly improved equipment reliability and stability: In existing technologies, combined forces easily cause complex deformation of the roller shaft, and the swaying force directly threatens the flexibility of the hinged support system. In this invention, the support ring, as a load-bearing component, has its swing center (spherical bearing) separated from the force transmission path (drive shaft), resulting in better structural rigidity. The specially designed U-shaped limit seat effectively constrains the lateral swing of the support ring, preventing it from jamming due to eccentric loading. The transmission system and the pressurized swing system are independent of each other and do not interfere with each other, fundamentally eliminating operational instability caused by force-flow coupling. The equipment vibration is small, making it suitable for long-term continuous and stable production of fine powder materials.

[0020] The invention enhances the system's fault tolerance and maintenance convenience: Each grinding roller drive unit is an independent module. When the drive motor of a certain unit fails, the grinding roller can be switched to passive operation mode by disengaging the universal coupling of that unit, driven by the grinding discs of other units, ensuring production continuity and avoiding machine downtime. Furthermore, the modular design makes the inspection and replacement of individual grinding roller units more convenient, and the lifting lugs on the support ring also facilitate maintenance operations.

[0021] This invention offers a superior solution for large-scale equipment: existing technologies are limited by the manufacturing bottlenecks of large rollers and heavy bearings. The "multi-unit independent drive, functional load-bearing" architecture of this invention is naturally suited to increasing capacity by increasing the number of standardized drive units. The miniaturization and standardization of transmission components frees large-scale design from the constraints of gigantic single transmission components, making manufacturing cost increases more linear and controllable, effectively resolving the manufacturing bottlenecks of large and ultra-large grinding mills.

[0022] In summary, this invention effectively solves the problem of grinding fine materials in traditional mills, while successfully avoiding the high cost and low reliability defects brought about by the "active grinding roller" technology in the prior art. Through innovative structural design, it achieves the optimal balance of performance, cost and reliability, and has outstanding substantive features and significant technological progress. Attached Figure Description

[0023] Figure 1 This is a top view of the present invention. Figure 2 This is a cross-sectional view of the present invention. Figure 3 This is a schematic diagram of the drive grinding roller unit structure of the present invention; Figure 4 This is a schematic diagram of the grinding disc rotation support assembly of the present invention.

[0024] In the diagram: 1. Main motor; 2. Coupling; 3. Reducer; 4. Main motor base; 5. Universal coupling; 6. Drive grinding roller unit; 6a. Transmission shaft; 6b. Self-aligning bearing; 6c. Support ring; 6d. Spherical plain bearing; 6e. Fixed seat; 6f. Lifting lug; 6g. Limit seat cover; 6h. Hydraulic cylinder pull lug seat; 6k. Limit seat; 6L. Sealing gasket; 6M. Grinding roller sleeve; 6N. Support bearing; 6p. Connecting flange; 7. Air inlet duct. 8. Disc body; 9. Shell; 9a. Feed inlet; 9b. Sealing door; 10. Hydraulic cylinder; 11. Grinding disc rotation support assembly; 11a. Load-bearing turntable; 11b. Thrust bearing; 11c. Support base; 11d. Bearing housing; 11e. Self-aligning bearing; 11f. Fixed shaft; 11g. Connecting plate; 12. Fixed base; 12a. Bottom support; 12b. Joint bearing bracket; 12c. Air duct bracket; 12d. Hydraulic cylinder hinge shaft base. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0026] Example 1: A grinding mill with multi-unit independently driven rotating grinding roller sleeves, such as... Figures 1 to 4 As shown, the device includes a housing 9, a disc 8 disposed within the housing 9, and multiple drive grinding roller units 6 arranged around the disc 8. The disc 8 is mounted on a fixed base 12 via a grinding disc rotation support assembly 11 and can be passively rotated. A classifier is mounted on the upper part of the housing 9, and an air inlet duct 7 communicating with the classifier is provided on the housing 9. The device is characterized in that each drive grinding roller unit 6 constitutes an independent grinding roller sleeve drive unit, which includes: a drive device; a drive shaft 6a, one end of which is connected to the output end of the drive device via a universal coupling 5; a support ring 6c, the rear end of which is hinged to a fixed base 6e via a spherical bearing 6d, allowing the support ring 6c to swing up and down around the spherical bearing 6d; a grinding roller sleeve 6M, which is rotatably supported on the front end of the support ring 6c via at least two support bearings 6N; and a connecting flange 6p, which fixes the other end of the drive shaft 6a to the grinding roller sleeve 6M. The power of the drive device is transmitted sequentially through the universal coupling 5, the drive shaft 6a and the connecting flange 6p, driving the roller sleeve 6M of the grinding roller unit to rotate actively around its own axis; the drive shaft 6a is supported in the support ring 6c by the self-aligning bearing 6b, so that the drive shaft 6a only transmits the driving torque.

[0027] The core innovation of this embodiment lies in the physical separation of torque transmission and pressure bearing functions. The drive shaft 6a is "suspended" inside the support ring 6c via a self-aligning bearing 6b, dedicated solely to transmitting drive torque and bearing almost no bending moment generated by grinding pressure. All grinding pressure, yaw force, and oscillation functions are borne by the more robust support ring 6c via a spherical bearing 6d. This fundamental restructuring significantly reduces the diameter of the drive shaft 6a and the specifications of its matching bearings (6b, 6N), substantially lowering the manufacturing cost, weight, and space occupation of the core transmission components compared to the robust rollers and large bearing assemblies required to withstand combined forces in existing technologies. Simultaneously, the clear and independent force flow path fundamentally avoids deformation and potential jamming risks caused by combined forces, improving system rigidity and operational stability, and providing a superior solution for equipment scaling.

[0028] Working Principle: The working principle of the grinding mill of this invention is as follows: Each drive device (such as the main motor 1 and the reducer 3) is activated, and power is transmitted through the universal coupling 5, the transmission shaft 6a, and the connecting flange 6p to drive each grinding roller sleeve 6M to rotate at high speed around its own axis. Simultaneously, the hydraulic cylinder 10 actuates, pressing down the entire drive grinding roller unit 6 via the hydraulic cylinder lug seat 6h acting on the middle of the support ring 6c, causing the grinding roller sleeve 6M to adhere tightly to the material layer on the disc 8 with a certain pressure. The actively rotating grinding roller sleeve 6M drives the disc 8 and the material on it to move together through friction, causing the disc 8 to rotate passively around its own axis, allowing the material to be evenly spread and form a stable material bed. The material is efficiently crushed and pulverized between the actively rotating grinding roller sleeve 6M and the passively rotating disc 8. The pulverized material is thrown out under the centrifugal force of the rotating disc 8 and blown by the high-speed airflow entering through the air inlet duct 7 to the upper classifier for sorting. Qualified fine powder is collected, while coarse particles fall back onto the disc 8 for further grinding. During this process, the drive shaft 6a only transmits the driving torque, while the grinding pressure and material reaction force are borne by the load-bearing swing system composed of the support ring 6c, the spherical bearing 6d and the limit seat 6k. The two functions are decoupled and do not interfere with each other.

[0029] How to use: Start-up preparation and pressurization: Start the drive device corresponding to each drive grinding roller unit 6 and run it under no-load. Operate the hydraulic system to extend all cylinders 10 synchronously, and pull down the support ring 6c through the cylinder pull lug seat 6h, so that each grinding roller sleeve 6M is pressed tightly on the disc body 8, and set the required grinding pressure.

[0030] Effect comparison: Unlike the existing technology where pressure is transmitted through the pressure bearing seat in the middle of the roller, in this step the pressure is directly applied to the support ring 6c, and the transmission shaft 6a does not participate in bearing pressure, which fundamentally avoids the bearing being subjected to combined loads, and improves the bearing life and system reliability.

[0031] Feeding and Grinding: The material to be ground is fed onto the disc 8 through the feed inlet 9a. The actively rotating grinding roller sleeve 6M quickly meshes and drives the disc 8 and the material to rotate through friction, forming a dynamic material bed and performing crushing and grinding.

[0032] Performance Comparison: In existing technologies, the roller needs to be driven and bear pressure simultaneously, which can easily lead to complex deformation due to uneven loading. The transmission shaft 6a of this invention only transmits torque, resulting in a pure force state, more efficient and stable driving, and is especially suitable for grinding fine materials with low friction.

[0033] Air classification and finished product collection: When the blower is turned on, the airflow enters the housing 9 through the air inlet duct 7, blowing the ground material thrown out from the edge of the disc 8 upwards to the air classifier. The qualified fine powder is collected at the outlet, while the coarse particles fall back into the disc 8 for further grinding.

[0034] Comparison of results: This step is a general process. However, because the grinding process of this invention is more stable and the vibration is less, it creates a more stable airflow environment for air classification, which is beneficial to improving the classification efficiency.

[0035] Operation monitoring and adjustment: During operation, the speed of the drive device of any drive roller unit 6 or the pressure of the oil cylinder 10 can be independently adjusted according to the material properties and fineness requirements to achieve flexible process control.

[0036] Performance Comparison: Each unit is completely independent, and adjustments do not interfere with each other. In existing technologies, adjusting the pressure or speed of one grinding roller may affect other grinding rollers and grinding discs through the material layer, resulting in strong linkage and inferior independent control compared to this invention.

[0037] Troubleshooting and Maintenance: If a drive unit malfunctions, its drive mechanism can be stopped independently, and the universal coupling 5 of that unit can be disconnected. The grinding roller sleeve 6M can then switch to passive operation mode under the drive of other units, maintaining production. This emergency mode is a direct advantage of the modular and independent design of this invention. Existing technologies have a stronger rigid connection between the roller shaft and the transmission system, making it difficult to achieve offline passive operation of a single roller, often requiring a shutdown for troubleshooting.

[0038] Example 2: Based on Example 1, the grinding mill further includes a limiting seat 6k, which is fixedly installed. The support ring 6c passes through the limiting seat 6k and can slide up and down along it. The limiting seat 6k is used to limit the lateral swing of the support ring 6c.

[0039] The limiting seat 6k provides precise vertical sliding guidance and crucial lateral constraint for the support ring 6c. It effectively resists the horizontal swaying force generated by uneven material layering during grinding, preventing harmful lateral swaying or torsion of the support ring 6c and the entire grinding roller unit. This design ensures the stability of the grinding trajectory between the grinding roller sleeve 6M and the disc body 8, avoiding increased local wear, decreased grinding efficiency, and potential damage to the spherical bearing 6d caused by swaying, greatly enhancing the operational reliability and lifespan of the equipment under off-center load conditions.

[0040] Example 3: Based on Example 2, the limiting seat 6k has a U-shaped opening through which the support ring 6c passes. A limiting seat cover 6g is provided above the limiting seat 6k. A sealing gasket 6L is provided between the limiting seat 6k and the grinding roller sleeve 6M, and the sealing gasket 6L fits snugly against the opening on the housing 9. The U-shaped opening structure makes the installation and removal of the support ring 6c more convenient. The limiting seat cover 6g prevents the support ring 6c from falling out and facilitates daily inspection. The sealing gasket 6L constitutes a key dynamic and static sealing point, effectively preventing high-concentration dust in the grinding chamber from overflowing through the gap between the support ring 6c and the opening in the housing 9, contaminating the external environment, or intruding into critical moving parts such as bearings (e.g., self-aligning bearings 6b) inside the support ring 6c. This ensures the cleanliness of the internal lubrication system and the long-term reliable operation of the transmission components, reducing maintenance frequency and costs.

[0041] Example 4: Based on Example 1, a cylinder lug seat 6h is provided in the middle of the support ring 6c; the grinding mill also includes a cylinder 10, one end of which is hinged to the cylinder lug seat 6h, and the other end is hinged to the cylinder hinge shaft base 12d provided on the fixed base 12. The cylinder 10 acts on the cylinder lug seat 6h in the middle of the support ring 6c through the hinge, providing stable and adjustable downward pressure for the entire grinding roller unit. This design, which places the force application point in the middle of the support ring, makes the pressure transmission path more direct and the lever arm more reasonable, which is conducive to the smooth swing of the entire grinding roller unit around the rear joint bearing 6d and the uniform application of pressure. At the same time, the hinged connection allows the cylinder 10 to adapt to the angle change when the support ring 6c swings and slides, avoiding the additional stress generated by the rigid connection and improving the reliability of the hydraulic system and mechanical structure.

[0042] Example 5: Based on Example 1, the grinding disc rotation support assembly 11 includes: a support base 11c, which is fixed on the fixed base 12; a load-bearing turntable 11a, which is supported on the support base 11c by a thrust bearing 11b, and the disc body 8 is fixedly installed on the load-bearing turntable 11a; the aforementioned thrust bearing 11b bearing structure can also be replaced with other bearing structures, or a high-pressure oil film bearing structure; a fixed shaft 11f, whose upper and lower ends are supported in the bearing seat 11d by self-aligning bearings 11e, the bearing seat 11d is fixedly connected to the support base 11c, and the load-bearing turntable 11a is fixedly sleeved on the fixed shaft 11f.

[0043] The grinding disc rotary support assembly 11 ingeniously integrates load-bearing, rotational guidance, and anti-eccentric load functions into one unit. The thrust bearing 11b mainly bears the huge axial load of the disc body 8, the material, and the grinding pressure; the vertically arranged self-aligning bearings 11e provide precise radial positioning and rotational guidance for the load-bearing turntable 11a and the disc body 8 through the fixed shaft 11f, and can automatically self-align to compensate for installation errors. This combined bearing structure enables the grinding disc rotary support assembly 11 to not only efficiently bear load, but also ensure the stability and concentricity of the disc body 8 during passive rotation, effectively resisting uneven loads from multiple active grinding rollers, and ensuring the flatness and stability of the grinding working surface (the upper surface of the disc body 8).

[0044] Example 6: Based on Example 1, the fixed seat 6e is mounted on the spherical bearing bracket 12b, which is fixed to the fixed base 12. The fixed seat 6e (and thus the entire swing hinge point of the grinding roller unit) is securely mounted on the unified fixed base 12 via the spherical bearing bracket 12b, ensuring the consistency of the mounting reference and structural rigidity of the swing centers of all driving grinding roller units 6. This avoids directly mounting the hinge point on components such as the housing that may deform, ensuring the long-term accuracy of the swing geometry of each grinding roller unit. This is the fundamental structural guarantee for achieving stable coordinated operation of multiple grinding rollers and uniform pressure distribution.

[0045] Example 7: Based on Example 5, the two side walls of the U-shaped opening of the limiting seat 6k slide against the outer peripheral surface of the support ring 6c. This sliding fit provides a low-friction, high-precision guiding interface. It ensures that the support ring 6c slides smoothly up and down within the limiting seat 6k, enabling the grinding roller sleeve 6M to quickly follow changes in material layer thickness. Furthermore, the surface contact effectively disperses and bears lateral sway forces, reducing local contact stress and improving the wear resistance and service life of the limiting seat 6k and the support ring 6c, making the lateral limiting function more durable and reliable.

[0046] Example 8: Based on Example 3, the sealing gasket 6L is fixedly mounted on the side of the limiting seat 6k facing the grinding roller sleeve 6M. Fixing the sealing gasket 6L to the limiting seat 6k, rather than the non-moving support ring 6c, simplifies the sealing structure. This static installation method allows the relative movement between the sealing gasket 6L and the opening in the housing 9 to be a simple planar sliding motion, facilitating effective sealing and minimizing wear. Furthermore, the replacement and maintenance of the sealing gasket 6L does not require disassembling the complex internal transmission and support components; it can be performed simply by opening the upper cover 6g of the limiting seat, greatly improving the maintainability of the equipment.

[0047] Example 9: Based on Example 4, the rod end of cylinder 10 is hinged to cylinder pull lug 6h via a pin. Pin hinge is a simple, reliable, and standard connection method. It ensures that the force transmission between cylinder 10 and cylinder pull lug 6h is purely tension-compression, avoiding bending moments and protecting the cylinder piston rod from lateral force damage. Pin connection also facilitates assembly and disassembly, providing convenience for on-site installation, commissioning, and subsequent cylinder replacement and maintenance.

[0048] Example 10: Based on Example 5, the bearing housing 11d is fixedly connected to the support base 11c via a connecting plate 11g. Using a connecting plate for this fixed connection ensures a robust and reliable structure, guaranteeing the relative positional accuracy between the bearing housing 11d and the support base 11c, thereby ensuring the coaxiality of the fixed shaft 11f and its self-aligning bearing 11e. This rigid connection enhances the overall structural rigidity of the grinding disc rotation support assembly 11, better transferring various loads (pressure, eccentric load) during the grinding process to the sturdy fixed base 12. This is a crucial structural detail ensuring the stable rotation of the disc 8 and resisting deformation.

[0049] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-unit independently driven grinding roller sleeve rotary grinding mill, comprising a housing (9), a disc (8) disposed within the housing (9), and a plurality of driving grinding roller units (6) arranged around the disc (8), wherein the disc (8) is mounted on a fixed base (12) via a grinding disc rotation support assembly (11) and can be passively rotated, a classifier is mounted on the upper part of the housing (9), and an air inlet duct (7) communicating with the classifier is provided on the housing (9); characterized in that, Each of the driving grinding roller units (6) constitutes an independent grinding roller sleeve driving unit, and the grinding roller sleeve driving unit includes: a driving device; A drive shaft (6a) has one end connected to the output end of the drive device via a universal coupling (5); The rear end of the support ring (6c) is hinged to the fixed seat (6e) via a spherical bearing (6d), so that the support ring (6c) can swing up and down around the spherical bearing (6d). A grinding roller sleeve (6M) is rotatably supported at the front end of the support ring (6c) by at least two support bearings (6N); and, A connecting flange (6p) securely connects the other end of the drive shaft (6a) to the grinding roller sleeve (6M); The power of the drive device is transmitted sequentially through the universal coupling (5), the drive shaft (6a) and the connecting flange (6p) to drive the grinding roller sleeve (6M) to rotate actively around its own axis; the drive shaft (6a) is supported in the support ring (6c) through the self-aligning bearing (6b) so that the drive shaft (6a) only transmits the driving torque.

2. The grinding mill with multi-unit independently driven rotating grinding roller sleeves according to claim 1, characterized in that, It also includes a limiting seat (6k), which is fixedly installed. The support ring (6c) passes through the limiting seat (6k) and can slide up and down along it. The limiting seat (6k) is used to limit the lateral swing of the support ring (6c).

3. The grinding mill with multi-unit independently driven rotating grinding roller sleeves according to claim 2, characterized in that, The limiting seat (6k) has a U-shaped opening, the support ring (6c) passes through the U-shaped opening, and a limiting seat cover (6g) is provided above the limiting seat (6k); a sealing gasket (6L) is provided between the limiting seat (6k) and the grinding roller sleeve (6M), and the sealing gasket (6L) fits into the opening on the housing (9).

4. The grinding mill with multi-unit independently driven rotating grinding roller sleeves according to claim 1, characterized in that, The support ring (6c) is provided with a cylinder pull lug seat (6h) in the middle; the grinding mill also includes a cylinder (10), one end of which is hinged to the cylinder pull lug seat (6h) and the other end is hinged to the cylinder hinge shaft base (12d) provided on the fixed base (12).

5. The grinding mill with multi-unit independently driven rotating grinding roller sleeves according to claim 1, characterized in that, The grinding disc rotation support assembly (11) includes: Support base (11c), which is fixed on the fixed base (12); The load-bearing turntable (11a) is supported on the support base (11c) by a thrust bearing (11b), and the disc body (8) is fixedly installed on the load-bearing turntable (11a). The fixed shaft (11f) is supported at its upper and lower ends by self-aligning bearings (11e) in the bearing housing (11d). The bearing housing (11d) is fixedly connected to the support seat (11c). The load-bearing turntable (11a) is fixedly sleeved on the fixed shaft (11f).

6. The grinding mill with multi-unit independently driven rotating grinding roller sleeves according to claim 1, characterized in that, The mounting base (6e) is mounted on the spherical bearing bracket (12b), and the spherical bearing bracket (12b) is fixed on the mounting base (12).

7. The grinding mill with multi-unit independently driven rotating grinding roller sleeves according to claim 5, characterized in that, The side walls of the U-shaped opening of the limiting seat (6k) slide in contact with the outer peripheral surface of the support ring (6c).

8. The grinding mill with multi-unit independently driven rotating grinding roller sleeves according to claim 3, characterized in that, The sealing gasket (6L) is fixedly disposed on the side of the limiting seat (6k) facing the grinding roller sleeve (6M).

9. The grinding mill with multi-unit independently driven rotating grinding roller sleeves according to claim 4, characterized in that, The rod end of the hydraulic cylinder (10) is hinged to the hydraulic cylinder lug seat (6h) by a pin.

10. The grinding mill with multi-unit independently driven rotating grinding roller sleeves according to claim 5, characterized in that, The bearing housing (11d) is fixedly connected to the support housing (11c) via a connecting plate (11g).

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