Wind blocking flange structure of raw material vertical mill

Abstract

The utility model discloses a raw material vertical mill wind blocking flange structure which comprises a millstone, a material blocking ring, a nozzle ring and a wind blocking flange, the material blocking ring is fixedly arranged on the outer periphery of the millstone, and the nozzle ring is arranged on the periphery of the millstone; the wind blocking flange is fixedly arranged on the peripheral wall of the material blocking ring and synchronously rotates along with the grinding disc; the nozzle ring is located below the peripheral side of the wind blocking flange. By changing the fixing mode of the wind blocking flange of the raw material vertical mill, the original fixed wind blocking flange welded on a nozzle ring is changed into the rotary wind blocking flange fixed on the peripheral wall of the material blocking ring, so that the material blocking ring can be prevented from being scoured by rising hot air flow, and meanwhile, the abrasion influence of overflowing materials on the material blocking ring is relieved; under the condition of ensuring the characteristics of an airflow field, the service life of the retaining ring can be effectively prolonged, and the hardfacing maintenance cost of the retaining ring is saved; meanwhile, a closed loop is formed after the wind blocking flange is changed from a fixed type to a rotary type, and the wind blocking effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of vertical mills, in particular to a wind shielding flange structure for a raw material vertical mill. Background Art

[0002] The working principle of the raw material mill is that the transmission device drives the grinding disc in the housing to rotate, and the grinding roller rotates around the grinding roller axis under the friction of the grinding disc. The material falls into the center of the grinding disc through the air-locking feeding device and the feed port, and moves to the edge of the grinding disc under the action of centrifugal force. When passing through the grinding track, it is bitten into the grinding roller and the grinding disc to be crushed. The crushing pressure of the grinding roller relative to the material and the grinding disc is provided by the hydraulic stretching device. During the crushing process, the material is simultaneously subjected to the pressure of the grinding roller and the shear force generated by the relative movement between the grinding disc and the grinding roller. After the material is squeezed, a material bed is formed on the grinding disc track, and the mutual squeezing and friction between the material particles in the material bed cause the edges and edges to peel off, which plays a role in further crushing. The ground material continues to move to the edge of the disc until it overflows out of the retaining ring. There is a nozzle ring around the grinding disc. The hot air flow from the nozzle ring carries the overflowed material upward at high speed from bottom to top. The large particles fall on the grinding disc first, and the smaller particles are brought into the powder selection device for coarse and fine classification under the action of the rising air flow. The coarse powder returns to the grinding disc for further grinding. The fine powder that meets the fineness requirements is taken as the finished product and is carried to the upper outlet of the casing by the air flow and enters the dust collector to be collected.

[0003] refer to Figure 1 In the prior art, the windshield flange structure of the raw material vertical mill includes a grinding disc 1, a material retaining ring 2, a nozzle ring 3 and a windshield flange 4. The material retaining ring 2 is fixedly arranged at the outer peripheral position of the grinding disc 1, and the material retaining ring 2 rotates with the grinding disc 1. Its function is to maintain a certain thickness of the grinding material layer; the nozzle ring 3 is arranged at the periphery of the grinding disc 1, and a windshield flange 4 is welded on the nozzle ring 3, that is, the windshield flange 4 and the nozzle ring 3 are fixed structures. The rising hot air flow at the nozzle ring 3 and the material overflowing from the material retaining ring 2 during the grinding process are the main reasons for the rapid wear of the material retaining ring 2. After the material retaining ring is worn, it is necessary to repair the material retaining ring with wear-resistant surfacing. On the one hand, the repair cost of the wear-resistant surfacing is high, and on the other hand, the repair time is long, which affects the normal operation of the equipment. Therefore, a new structural method is urgently needed to solve the problem of rapid wear of the material retaining ring. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a raw material vertical mill wind shielding flange structure which has good wind shielding effect, can prevent hot air flow from scouring the material shielding ring, and at the same time reduce the wear of the material shielding ring by overflowing materials.

[0005] In order to solve the above technical problems, the technical solution of the utility model is: a raw material vertical mill windshield flange structure, including a grinding disc, a material retaining ring, a nozzle ring and a windshield flange, the material retaining ring is fixedly arranged at the outer peripheral edge of the grinding disc, and a nozzle ring is arranged at the periphery of the grinding disc; the windshield flange is fixedly arranged on the outer peripheral wall of the material retaining ring, and the windshield flange rotates synchronously with the grinding disc; the nozzle ring is located below the outer peripheral side of the windshield flange.

[0006] As a preferred technical solution, a plurality of reinforcing ribs are welded between the wind shield flange and the material retaining ring.

[0007] As a preferred technical solution, the reinforcement ribs are evenly distributed along the circumferential direction.

[0008] As a preferred technical solution, the wind shield flange is welded to the outer peripheral wall of the material retaining ring.

[0009] Due to the adoption of the above-mentioned technical scheme, the utility model has at least the following beneficial effects: by changing the fixing method of the windshield flange of the raw material vertical mill, that is, changing the fixed windshield flange originally welded on the nozzle ring to a rotating windshield flange fixed on the outer peripheral wall of the material retaining ring, after such transformation, on the one hand, the upward wind direction at the nozzle ring is changed, which can avoid the rising hot air flow from eroding the material retaining ring, and at the same time reduce the wear effect of the overflow material on the material retaining ring. While ensuring the characteristics of the airflow field, the service life of the material retaining ring can be effectively improved, and the maintenance cost of the wear-resistant cladding of the material retaining ring can be saved; on the other hand, after the windshield flange is changed from a fixed type to a rotating type, a closed loop is formed, which has a good windshield effect and is suitable for wide promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The following drawings are only intended to illustrate and explain the present invention, and do not limit the scope of the present invention.

[0011] Figure 1 It is a schematic diagram of the layout of the windshield flange structure of the raw material vertical mill in the prior art;

[0012] Figure 2 It is a schematic diagram of the arrangement of the windshield flange structure of the raw material vertical mill in the embodiment of the utility model;

[0013] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure along the AA direction. DETAILED DESCRIPTION

[0014] The present invention is further described below in conjunction with the accompanying drawings and examples. In the following detailed description, only certain exemplary embodiments of the present invention are described by way of illustration. Needless to say, those skilled in the art will recognize that the described embodiments may be modified in various ways without departing from the spirit and scope of the present invention. Therefore, the drawings and descriptions are illustrative in nature and are not intended to limit the scope of protection of the claims.

[0015] like Figure 2 and Figure 3 As shown, the windshield flange structure of the raw material vertical mill includes a grinding disc 1, a material retaining ring 2, a nozzle ring 3 and a windshield flange 4. The material retaining ring 2 is fixedly arranged at the outer peripheral edge of the grinding disc 1, and the nozzle ring 3 is arranged at the periphery of the grinding disc 1; the windshield flange 4 is fixedly arranged on the outer peripheral wall of the material retaining ring 2, so that the windshield flange 4 rotates synchronously with the grinding disc 1; the nozzle ring 3 is located at the lower outer peripheral side of the windshield flange 4, and during the production operation, the windshield flange 4 will not scratch the nozzle ring 3 when rotating.

[0016] refer to Figure 1 and Figure 2 Based on the original structure, the specific modification and installation method of the windshield flange is as follows:

[0017] (1) Remove the original windshield flange 4 from the nozzle ring 3;

[0018] (2) At an appropriate height of the retaining ring 2 (determined according to the actual situation of each mill, in order to prevent the windshield flange from scratching the nozzle ring during production operation), the wear-resistant cladding layer is removed by blasting to expose the parent material;

[0019] (3) processing a new windshield flange 4 according to the diameter of the mother plate of the outer ring of the retaining ring 2, welding the processed windshield flange 4 to the position of the mother plate of the outer ring of the retaining ring 2, and reinforcing the windshield flange 4 with a plurality of reinforcing ribs 6;

[0020] (4) According to the rotation track of the windshield flange 4 welded on the retaining ring 2, the tie rod sealing box 5 is retracted and modified, and the retracted size is based on the windshield flange 4 not scratching it after rotation.

[0021] In this way, by changing the fixing method of the raw material vertical mill windshield flange, that is, changing the fixed windshield flange originally welded on the nozzle ring 3 into a rotating windshield flange fixed on the outer peripheral wall of the material retaining ring 2, after such transformation, on the one hand, the upward wind direction at the nozzle ring 3 is changed, which can avoid the rising hot air flow from eroding the material retaining ring 2, and at the same time reduce the wear effect of the overflow material on the material retaining ring 2. While ensuring the characteristics of the air flow field, the service life of the material retaining ring 2 can be effectively improved, and the maintenance cost of the wear-resistant cladding of the material retaining ring can be saved; on the other hand, the windshield flange 4 is changed from a fixed type to a rotating type to form a closed loop, which has a good windshield effect and is suitable for wide promotion and application.

[0022] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A windshield flange structure for a raw material vertical mill, comprising a grinding disc, a material retaining ring, a nozzle ring and a windshield flange, wherein the material retaining ring is fixedly arranged at the outer peripheral edge of the grinding disc, and a nozzle ring is arranged at the periphery of the grinding disc; the characteristics are: The wind shield flange is fixedly arranged on the outer peripheral wall of the material retaining ring, and the wind shield flange rotates synchronously with the grinding disc; the nozzle ring is located below the outer peripheral side of the wind shield flange.

2. The windshield flange structure for a raw material vertical mill according to claim 1, characterized in that: A plurality of reinforcing ribs are welded between the wind shield flange and the material blocking ring.

3. The windshield flange structure for a raw material vertical mill according to claim 2, characterized in that: The reinforcement ribs are evenly distributed along the circumferential direction.

4. The windshield flange structure for a raw material vertical mill according to any one of claims 1 to 3, characterized in that: The wind shield flange is welded to the outer peripheral wall of the material blocking ring.

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