CN212396891U - Grinding disc structure and coal mill - Google Patents

Abstract

The utility model discloses a mill structure that coal pulverizer contained keeps off the coal ring at the outlying eaves limit of mill body department fixed mounting to block the part raw coal that is thrown away under the centrifugal force, remain it on the mill body in order to increase coal seam thickness, provide sufficient thick shock attenuation buffer layer for the collision of coal pulverizer mill grinding bowl and mill, thereby can effectively reduce the emergence of the vibration condition under the low-load, guarantee the steady operation of coal pulverizer, this utility model is used for the mechanical equipment field.

Description

Grinding disc structure and coal mill

Technical Field

The utility model relates to the field of mechanical equipment, especially, relate to a mill structure and coal pulverizer.

Background

The grinding principle of the coal grinding machine is that raw coal falls onto a grinding disc from a central coal dropping pipe of the grinding machine, a rotating grinding disc throws the raw coal onto a grinding roller way at the edge of the grinding disc by virtue of centrifugal force, grinding is carried out through a grinding roller, and a gap between the grinding roller and the grinding disc is enlarged by a coal seam on the grinding roller way.

Because the rotational speed is high, the raw coal is thrown farther under the effect of centrifugal force, the coal seam becomes thin, especially the thinning condition is more obvious under the low-load condition, at this moment, under the effect of hydraulic loading force, the grinding bowl and the grinding disc of the coal mill collide with each other, and the vibration is larger.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a reduce mill structure and coal pulverizer of the vibration condition under the low-load.

The utility model adopts the technical proposal that:

the utility model provides a mill structure, including mill body, at least one with mill body looks fixed fender coal ring, mill body's periphery is equipped with eaves limit, each keep off the coal ring and all install on eaves limit and set up with mill body is concentric.

Further conduct the utility model discloses technical scheme's improvement, each keep off the coal ring and form through a plurality of coal blocking piece concatenations respectively.

Further conduct the utility model discloses technical scheme's improvement, each the longitudinal section of fender coal cinder all is the L type, each keep off the coal cinder respectively including bar founding piece and arc diaphragm, each arc diaphragm is fixed with the eaves limit laminating, each the bar founds the piece and bends along length direction respectively.

Further conduct the utility model discloses technical scheme's improvement, each the arc diaphragm all is located rectangular shape stand convex surface one side.

Further conduct the utility model discloses technical scheme's improvement, it is same set up two at least strengthening ribs, each between the bar of fender coal cinder and the arc diaphragm the strengthening rib equidistance interval distribution.

Further conduct the utility model discloses technical scheme's improvement, the high scope of bar founds the piece is 55 ~ 65 mm.

Further conduct the utility model discloses technical scheme's improvement, keep off and pass through welded fastening between coal ring and the eaves limit.

A coal pulverizer comprising a grinding disc structure as described above.

The utility model has the advantages that: the millstone structure that this coal pulverizer contained keeps off the coal ring at the outlying eaves limit of millstone body department fixed mounting to block the part raw coal that is thrown away under the centrifugal force effect, remain it on the millstone body in order to increase coal seam thickness, provide the shock attenuation buffer layer of sufficient thickness for the collision of coal pulverizer mill grinding bowl and mill, thereby can effectively reduce the emergence of the vibration condition under the low-load, guarantee the steady operation of coal pulverizer.

Drawings

The present invention will be further explained with reference to the accompanying drawings:

FIG. 1 is a schematic view of the overall structure of a coal pulverizer according to an embodiment of the present invention;

fig. 2 is a structural diagram of a coal retaining ring according to an embodiment of the present invention.

Detailed Description

This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.

In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

Referring to fig. 1 and 2, an embodiment of a grinding disc structure installed on a coal mill of the present invention is described, the grinding disc structure comprises a grinding disc body 1, the grinding disc body 1 is a disc-shaped structure, the longitudinal section of the grinding disc body is a symmetrical inclined plane, the inclination is about 30 degrees from the edge to the middle, and the maximum depth of the middle is about 0.5 meter; further, the peripheral eaves limit thickness of mill body 1 is about 0.15 meters, keeps off coal ring 2 installation and fixes on eaves limit and set up with mill body 1 concentric.

This mill structure keeps off coal ring 2 at 1 outlying eaves limit of mill body fixed mounting, has increased the height of grinding bowl to block the part raw coal that is thrown away under the centrifugal force effect, remain it on mill body 1 in order to increase coal seam thickness, provide the shock attenuation buffer layer of sufficient thickness for the collision of coal pulverizer grinding bowl and mill, thereby can effectively reduce the emergence of the vibration condition under the low-load, guarantee the steady operation of coal pulverizer.

In the embodiment, more specifically, the coal retaining ring 2 is formed by splicing eight arc-shaped coal retaining blocks 21, and the coal retaining blocks 21 are spliced end to form a circular ring. Further as an improvement, the longitudinal section of each coal blocking block 21 is L-shaped, each coal blocking block 21 comprises a strip-shaped vertical piece and an arc-shaped transverse plate, each arc-shaped transverse plate is fixedly attached to the eaves edge, and each strip-shaped vertical piece is bent along the length direction; specifically, each arc diaphragm all is located the convex surface one side of bar stand, and the width design of each arc diaphragm is 90 mm. Furthermore, in order to enhance the overall rigidity and strength of the coal blocking block 21, the manufacturing material of each coal blocking block 21 is made of wear-resistant alloy steel, while the manufacturing material of the coal blocking block 21 in this embodiment is 40 crmomensire, in addition, in this embodiment, two reinforcing ribs 211 are arranged between the strip-shaped vertical piece and the arc-shaped transverse plate of the same coal blocking block 21, and in order to ensure the uniform distribution of force, the reinforcing ribs 211 are distributed at equal intervals. Preferably, each reinforcing rib 211 is a steel plate with a right-angled triangle, two right-angled sides are respectively attached to the strip-shaped vertical member and the arc-shaped transverse plate, and the thickness of each steel plate is 10 mm.

Furthermore, tests prove that the height range of the strip-shaped vertical piece of the coal retaining ring 2 is 55-65 mm, wherein the height is optimal when the height is 65mm, and the fineness of ground coal powder can be influenced when the height is too large; and the height of the coal bed is too small, so that the thickness of the built coal bed is too small, the collision between a grinding bowl and a grinding disc of the grinding disc machine cannot be effectively buffered and damped, and the vibration generated in the working and running process is still large.

Further conduct the utility model discloses technical scheme's improvement should keep off through welded fastening between coal ring 2 and the eaves limit, and the local every 30mm welding of contacting of the eaves limit of each fender coal cinder 21 and mill welds one 10 mm's welding seam to increase the fixed firmness of installation. In some embodiments, the coal retaining ring 2 is connected with the eaves edge by screws, but the screws are easily worn and loosened due to the washing of pulverized coal in the use process, so that the coal retaining ring 2 falls off, and a better method is to adopt welding installation.

The utility model also introduces a coal pulverizer, its contain as above mill structure, the top bilateral symmetry of mill structure is equipped with three each other and is 120 grinding roller 3.

Naturally, the invention is not limited to the above-described embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the invention, and such equivalent modifications or substitutions are included in the scope of the claims of the present application.

Claims (7)

1. A grinding disc structure, characterized in that: including mill body (1), at least one with mill body (1) fixed fender coal ring (2) mutually, the periphery of mill body (1) is equipped with eaves limit, each keep off coal ring (2) and all install on eaves edge and with mill body (1) concentric setting, each keep off coal ring (2) and form through a plurality of fender coal piece (21) concatenation respectively, each keep off coal piece (21) respectively including bar founding piece and arc diaphragm, each arc diaphragm is fixed with the eaves limit laminating, each the bar founds the piece and bends along length direction respectively.

2. The abrasive disc structure of claim 1 wherein: the longitudinal section of each coal blocking block (21) is L-shaped.

3. The abrasive disc structure of claim 2 wherein: each arc diaphragm all is located the convex surface one side of rectangular shape upright piece.

4. The abrasive disc structure of claim 2 wherein: at least two reinforcing ribs (211) are arranged between the strip-shaped vertical piece of the coal blocking block (21) and the arc-shaped transverse plate, and the reinforcing ribs (211) are distributed at equal intervals.

5. The abrasive disc structure of claim 2 wherein: the height range of the strip-shaped vertical piece is 55-65 mm.

6. The abrasive disc structure of claim 1 wherein: the coal retaining ring (2) is fixed with the eaves edge by welding.

7. A coal pulverizer, characterized in that: comprising the abrasive disc structure of any one of claims 1 to 6.

Images