A classification device for an ultrafine powder dry grinder

Abstract

The utility model relates to ultra -fine powder production technical field, concretely relates to a kind of grading device of ultra -fine powder dry grinder. Including machine body seat, the middle position of machine body seat upper side wall is fixed with powder outlet pipe, the inside of machine body seat is provided with grading assembly, the grading assembly includes the assembly pipe vertically fixed in the inside of powder outlet pipe, the upper end of assembly pipe is through powder outlet pipe side wall and extends out, the inside of assembly pipe is coaxially rotationally arranged with main shaft by bearing, the upper end of main shaft extends to the outside of assembly pipe and is provided with driving mechanism, and the driving mechanism is used to drive main shaft rotation. The utility model, through the combination of gland and inlay ring to form labyrinth seal structure, and in its inside filling high-temperature grease constitutes airtight sealing barrier, so that the dust in powder outlet pipe cannot invade assembly pipe inside through labyrinth seal structure, simultaneously in avoiding bearing surface dust accumulation, thereby significantly prolong the service life of bearing in dust environment.

Description

Technical Field

[0001] This utility model relates to the field of ultrafine powder production technology, specifically to a grading device for an ultrafine powder dry grinding mill. Background Technology

[0002] In the industrial sector, vertical roller grinding units are commonly used in the preparation of ultrafine powders. This equipment integrates grinding and sorting functions and is the core device for ultrafine powder processing.

[0003] The existing air classifiers used with vertical roller mills have certain technical limitations during operation. Specifically, the main shaft of the air classifier is directly mounted within the main frame of the classifier via an open bearing assembly. When the air classifier performs material sorting operations, the rotating main shaft drives the impeller to rotate at high speed, generating a grading airflow. During this process, due to the lack of effective sealing and isolation measures, fine powder continuously intrudes into the bearing working area through the axial gap. This unavoidable dust infiltration phenomenon will cause multiple negative effects:

[0004] 1. Powder particles mix with bearing lubricating medium to form grinding paste, causing lubrication system failure;

[0005] 2. Hard particles entering the raceway exacerbate contact surface friction, causing abnormal temperature rise in the bearing assembly, which ultimately leads to premature pitting, jamming and other mechanical damage to the bearing assembly, significantly reducing the service life of the bearing assembly.

[0006] This structural defect not only increases equipment maintenance costs, but also affects the operational stability and sorting efficiency of the entire wind power sorter. Utility Model Content

[0007] The purpose of this invention is to provide a grading device for an ultrafine powder dry grinding mill, so as to solve the problems mentioned in the background art above:

[0008] The main shaft of the wind separator is directly assembled into the main frame of the separator through an open bearing assembly. When the wind separator performs material sorting operations, fine powder can easily intrude into the working area of ​​the bearing, reducing the service life of the bearing assembly.

[0009] To address the above problems, the present invention aims to provide a grading device for an ultrafine powder dry grinding mill, comprising a machine base, a powder outlet pipe fixedly disposed at the middle position of the upper side wall of the machine base, a grading assembly disposed inside the machine base, the grading assembly comprising an assembly pipe vertically fixed inside the powder outlet pipe, the upper end of the assembly pipe penetrating through the side wall of the powder outlet pipe and extending outward, a main shaft coaxially rotatably disposed inside the assembly pipe via a bearing, the upper end of the main shaft extending outside the assembly pipe and disposed of a drive mechanism, the drive mechanism being used to drive the main shaft to rotate, the lower end of the main shaft extending inside the machine base and coaxially fixed with a distributing impeller, a sealing assembly disposed between the distributing impeller and the assembly pipe, the sealing assembly being used to prevent dust inside the powder outlet pipe from entering the assembly pipe.

[0010] As a further improvement to this technical solution, the sealing assembly includes a gland coaxially fixed to the lower side wall of the assembly tube by bolts. The inner circumferential wall of the gland is in rotatable contact with the outer circumferential wall of the main shaft. An annular groove is coaxially formed on the lower side wall of the gland. A sealing sleeve is coaxially fixed to the upper side wall of the material distribution impeller by bolts. An L-shaped interlocking ring is coaxially fixed to the inner circumferential wall of the sealing sleeve.

[0011] As a further improvement to this technical solution, the upper end of the fitting ring is rotatably disposed in the annular groove, and the fitting ring is in rotatable contact with the lower side wall of the gland. The outer circumferential wall of the gland is in rotatable contact with the inner circumferential wall of the sealing sleeve, and a high-temperature resistant grease filling layer is provided on the contact surface between the fitting ring and the gland.

[0012] As a further improvement to this technical solution, the sealing assembly also includes a sealing impeller coaxially fixed to the upper side wall of the sealing sleeve. The sealing impeller is rotatably sleeved on the outside of the assembly tube. When the dispensing impeller drives the sealing impeller to rotate through the sealing sleeve, the sealing impeller generates a directional airflow to blow outward through centrifugal force.

[0013] As a further improvement to this technical solution, the sealing assembly also includes an oil filling port opened on the top of the gland, the oil filling port being connected to the interior of the annular groove, and an oil injection pipe being fixedly installed inside the oil filling port, the upper end of the oil injection pipe penetrating through the side wall of the powder pipe and extending outward.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] 1. The grading device of this ultra-fine powder dry grinding mill forms a labyrinth seal structure by combining a pressure cap and an interlocking ring, and fills the inside with high-temperature resistant grease to form a sealed barrier. This prevents dust in the powder outlet pipe from entering the assembly pipe through the labyrinth seal structure, eliminating the wear risk caused by dust accumulation on the bearing surface, thereby significantly extending the service life of the bearing in dusty environments.

[0016] 2. The grading device of this ultrafine dry grinding mill, when the distributing impeller rotates to sort the powder, the distributing impeller drives the sealing impeller to rotate through the sealing sleeve. The sealing impeller generates a directional airflow that blows outward through centrifugal force. This airflow field blows outward continuously, effectively blocking dust from migrating into the joint gap between the sealing sleeve and the pressure cap, thereby preventing dust from seeping into the assembly tube and causing bearing wear. Through the active air sealing mechanism, a secondary protection is formed on the basis of the labyrinth seal structure, which significantly improves the dustproof performance and service life of the bearing assembly. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a cross-sectional view of the overall structure of this utility model;

[0019] Figure 3 For the present utility model Figure 2 Enlarged view of the structure at point A in the middle;

[0020] Figure 4 This is a partial structural schematic diagram of the present invention.

[0021] The meanings of the labels in the diagram are as follows:

[0022] 1. Machine base; 11. Powder outlet pipe;

[0023] 2. Grading assembly; 21. Assembly pipe; 211. Bearing; 22. Main shaft; 23. Distributor impeller; 24. Pressure cap; 25. Sealing sleeve; 26. Fitting ring; 27. Sealing impeller; 28. Oil injection pipe. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example 1

[0026] Please see Figure 1As shown, the purpose of this embodiment is to provide a grading device for an ultrafine dry grinding mill, including a machine base 1, which is fixedly installed on the top of the grinding mill. A powder outlet pipe 11 is fixedly installed in the middle of the upper side wall of the machine base 1. A grading component 2 is installed inside the machine base 1. The grading component 2 is used to screen the particle size of the material after grinding. The finished powder that meets the particle size requirements after sorting is discharged through the powder outlet pipe 11. The coarse particles that do not meet the requirements are sent back to the grinding component of the grinding mill for secondary crushing.

[0027] The structure of hierarchical component 2 is detailed below, referring to... Figure 2 The grading component 2 includes an assembly tube 21 vertically fixed inside the powder outlet pipe 11. The upper end of the assembly tube 21 penetrates the side wall of the powder outlet pipe 11 and extends outward. Inside the assembly tube 21, a main shaft 22 is coaxially rotatably mounted via a bearing 211. The upper end of the main shaft 22 extends outside the assembly tube 21 and is equipped with a drive mechanism. The drive mechanism is used to drive the main shaft 22 to rotate. The lower end of the main shaft 22 extends inside the machine body 1 and is coaxially fixed with a material distribution impeller 23. When the drive mechanism is running, it drives the main shaft 22 to rotate. The main shaft 22 drives the material distribution impeller 23 to rotate. The material distribution impeller 23 adopts the standard impeller structure of a wind classifier (its function is based on the sorting principle of a wind classifier). Through the negative pressure effect generated by the rotation of the material distribution impeller 23, the powder material processed by the grinding mill is sucked in and sorted by particle size. This sorting process follows the working principle of a wind classifier and is within the scope of existing technology, so it will not be described in detail here.

[0028] The drive mechanism includes a motor vertically mounted on the side wall of the powder outlet pipe 11. The output shaft of the motor is coaxially fixed to a drive wheel via a spline, and the upper end of the main shaft 22 is coaxially fixed to a driven wheel via a spline. The driven wheel and the drive wheel are connected by a transmission belt to form a belt drive mechanism. When the motor starts, the output shaft of the motor drives the drive wheel to rotate, and the drive wheel drives the driven wheel to rotate via the transmission belt. This causes the driven wheel to drive the main shaft 22 and the material distribution impeller 23 to rotate, ultimately realizing the particle size separation function of the ground powder material.

[0029] Meanwhile, a sealing assembly is provided between the material distribution impeller 23 and the assembly pipe 21. The sealing assembly is used to prevent dust inside the powder outlet pipe 11 from entering the assembly pipe 21. The structure of the sealing assembly is detailed below, refer to Figure 3 and Figure 4The sealing assembly includes a pressure cap 24 coaxially fixed to the lower side wall of the assembly tube 21 by bolts. The inner circumferential wall of the pressure cap 24 is in rotatable contact with the outer circumferential wall of the main shaft 22. The lower side wall of the pressure cap 24 is coaxially provided with an annular groove. The upper side wall of the distribution impeller 23 is coaxially fixed with a sealing sleeve 25 by bolts. The inner circumferential wall of the sealing sleeve 25 is coaxially fixed with an L-shaped cross-section fitting ring 26. The fitting ring 26 and the sealing sleeve 25 are integrally formed. The upper end of the fitting ring 26 is rotatably disposed in the annular groove, and the fitting ring 26 is in rotatable contact with the lower side wall of the pressure cap 24. The outer circumferential wall of the pressure cap 24 is in rotatable contact with the inner circumferential wall of the sealing sleeve 25.

[0030] The gland 24 and the fitting ring 26 combine to form a labyrinth seal structure. A labyrinth seal is a seal with many tortuous chambers between rotating and stationary parts to reduce leakage. A high-temperature grease filling layer is provided on the contact surface of the fitting ring 26 and the gland 24. That is, the labyrinth seal structure is filled with high-temperature grease. By filling the interior with high-temperature grease, a sealed barrier is formed, preventing dust inside the powder outlet pipe 11 from entering the assembly pipe 21. When the main shaft 22 drives the distribution impeller 23 to rotate, the distribution impeller 23 drives the sealing sleeve 25 to rotate relative to the gland 24. The high-temperature grease can effectively reduce the friction between the sealing sleeve 25 and the gland 24, thereby ensuring the smooth rotation of the distribution impeller 23. This design effectively blocks the dust penetration path, preventing dust in the powder outlet pipe 11 from entering the assembly pipe 21 through the labyrinth seal structure. This structure avoids dust accumulation on the surface of the bearing 211 through physical isolation, thereby significantly extending the service life of the bearing 211 in dusty environments.

[0031] The sealing assembly also includes a sealing impeller 27 coaxially fixed to the upper side wall of the sealing sleeve 25. The sealing impeller 27 is rotatably sleeved on the outside of the assembly tube 21. When the dispensing impeller 23 drives the sealing impeller 27 to rotate through the sealing sleeve 25, the sealing impeller 27 generates a directional airflow through centrifugal force and blows it outward. This airflow field blows outward continuously, effectively blocking dust from migrating into the joint gap between the sealing sleeve 25 and the pressure cap 24, thereby preventing dust from seeping into the interior of the assembly tube 21 and causing wear on the bearing 211. This structure forms a secondary protection on the basis of the original seal through an active air sealing mechanism, significantly improving the dustproof performance and service life of the bearing 211 assembly.

[0032] The sealing assembly also includes a grease inlet located on the top of the gland 24. The grease inlet is connected to the interior of the annular groove, and a grease injection pipe 28 is fixedly installed inside the grease inlet. The upper end of the grease injection pipe 28 passes through the side wall of the powder outlet pipe 11 and extends outwards. When the high-temperature grease inside the labyrinth seal structure is depleted due to long-term use, the operator can directly replenish the grease to the labyrinth structure through the exposed grease injection pipe 28. This design effectively solves the problem of increased friction between the sealing sleeve 25 and the gland 24 caused by lubricant consumption, and ensures the long-term stable operation of the sealing system by continuously maintaining the thickness of the lubrication layer.

[0033] When this device is in use, the drive mechanism simultaneously drives the main shaft 22 and the distribution impeller 23 to rotate synchronously, realizing the particle size sorting of the ground powder material. In this working process, the distribution impeller 23 drives the sealing impeller 27 to rotate synchronously through the sealing sleeve 25. The sealing impeller 27 forms a directional airflow field under centrifugal action and continuously blows outward. This airflow field can effectively block the migration of dust to the joint gap between the sealing sleeve 25 and the pressure cover 24. Combined with the labyrinth seal structure formed by the pressure cover 24 and the fitting ring 26, a double protection system is formed, thereby preventing dust from penetrating into the assembly tube 21 and causing the bearing 211 to wear.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A grading device for an ultrafine powder dry grinding mill, comprising a machine body base (1), wherein a powder outlet pipe (11) is fixedly disposed at the middle position of the upper side wall of the machine body base (1), characterized in that: The machine body base (1) is provided with a grading component (2). The grading component (2) includes an assembly tube (21) that is vertically fixed inside the powder outlet pipe (11). The upper end of the assembly tube (21) passes through the side wall of the powder outlet pipe (11) and extends outward. A main shaft (22) is coaxially rotatably arranged inside the assembly tube (21) through a bearing (211). The upper end of the main shaft (22) extends to the outside of the assembly tube (21) and is provided with a drive mechanism. The drive mechanism is used to drive the main shaft (22) to rotate. The lower end of the main shaft (22) extends to the inside of the machine body base (1) and is coaxially fixed with a material distribution impeller (23). A sealing component is provided between the material distribution impeller (23) and the assembly tube (21). The sealing component is used to prevent dust inside the powder outlet pipe (11) from entering the assembly tube (21).

2. The grading device for the ultrafine powder dry grinding mill according to claim 1, characterized in that: The sealing assembly includes a pressure cap (24) coaxially fixed to the lower side wall of the assembly tube (21) by bolts. The inner circumferential wall of the pressure cap (24) is in rotatable contact with the outer circumferential wall of the main shaft (22). The lower side wall of the pressure cap (24) is coaxially provided with an annular groove. The upper side wall of the material distribution impeller (23) is coaxially fixed with a sealing sleeve (25) by bolts. The inner circumferential wall of the sealing sleeve (25) is coaxially fixed with an L-shaped cross-section fitting ring (26).

3. The grading device for the ultrafine powder dry grinding mill according to claim 2, characterized in that: The upper end of the fitting ring (26) is rotatably disposed in the annular groove, and the fitting ring (26) is in rotatable contact with the lower side wall of the pressure cap (24). The outer circumferential wall of the pressure cap (24) is in rotatable contact with the inner circumferential wall of the sealing sleeve (25), and a high-temperature resistant grease filling layer is provided on the contact surface of the fitting ring (26) and the pressure cap (24).

4. The grading device for the ultrafine powder dry grinding mill according to claim 2, characterized in that: The sealing assembly also includes a sealing impeller (27) coaxially fixed to the upper side wall of the sealing sleeve (25). The sealing impeller (27) is rotatably sleeved on the outside of the assembly tube (21). When the material distribution impeller (23) drives the sealing impeller (27) to rotate through the sealing sleeve (25), the sealing impeller (27) generates a directional airflow to blow outward through centrifugal force.

5. The grading device for the ultrafine powder dry grinding mill according to claim 2, characterized in that: The sealing assembly also includes an oil filling port opened on the top of the pressure cap (24), the oil filling port is connected to the inside of the annular groove, and an oil injection pipe (28) is fixedly installed inside the oil filling port. The upper end of the oil injection pipe (28) passes through the side wall of the powder outlet pipe (11) and extends outward.

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