CN213315371U

CN213315371U - Sand dune-shaped steel ball coal mill material-saving lining plate meeting steel ball impact angle

Info

Publication number: CN213315371U
Application number: CN202021993383.4U
Authority: CN
Inventors: 寇鹏
Original assignee: Laicheng Power Plant Huadian International Power Co ltd
Current assignee: Laicheng Power Plant Huadian International Power Co ltd
Priority date: 2020-09-14
Filing date: 2020-09-14
Publication date: 2021-06-01
Anticipated expiration: 2030-09-14

Abstract

The utility model relates to a dune-shaped steel ball coal mill material-saving lining plate meeting the impact angle of a steel ball, which comprises a lining plate body, wherein the lining plate body is of a dune-shaped structure; the lining plate body comprises a lower arc-shaped contact surface, an upper collision impact surface and two side connection surfaces; the upper collision impact surface comprises a hill valley impact surface, a hill top impact surface and a hill slope impact surface which are continuously arranged; the thickness of the hill top impact surface is the largest, the thickness of the hill top impact surface gradually decreases from the hill top impact surface to the hill slope impact surface, and the thickness of the hill top impact surface first decreases and then increases from the hill top impact surface to the hill valley impact surface; the thickness of the distal end of the hill impact surface is equal to the thickness of the distal end of the hill impact surface. The thickness of the hill top impact surface, the thickness of the hill slope impact surface and the thickness of the hill valley impact surface are gradually reduced, and the wear reduction speed of the hill top impact surface, the hill slope impact surface and the hill valley impact surface is gradually reduced, so that the hill top impact surface, the hill slope impact surface and the hill valley impact surface can be better and synchronously worn to a limit value, the residual of the unworn lining plate material is reduced, and the plate material is saved on the whole.

Description

Sand dune-shaped steel ball coal mill material-saving lining plate meeting steel ball impact angle

Technical Field

The utility model belongs to the technical field of the coal pulverizer accessory technique and specifically relates to cater for sand dune shape steel ball coal pulverizer material-saving welt of steel ball striking angle.

Background

In coal-fired thermal power plants, steel ball coal mills (ball mills for short) play a role in grinding raw coal into coal dust. In order to protect the ball mill cylinder and bring up the steel balls, the lining plate is tightly fixed on the inner wall of the cylinder by bolts, the steel balls are brought to a certain height by the raised part of the lining plate in operation and fall down, and the whole lining plate is impacted and abraded by the steel balls at a certain angle. Consequently, the lining plates are necessarily worn and the lining plates which are seriously worn must be replaced each time the operation is carried out for a period of time. The abrasion speed of each part of each lining plate is different under the impact, and the abrasion of the convex part is the most serious generally. And other parts are worn slightly at the moment, so that the replacement of the lining plate causes the waste of the slightly worn part of the plate.

Based on above-mentioned technical problem, this patent provides a sand dune shape steel ball coal mill material-saving welt that caters for steel ball striking angle, can reasonably accept the striking of steel ball major direction for the whole even wearing and tearing of welt, make full use of welt panel effectively reduces surplus steel extravagant.

SUMMERY OF THE UTILITY MODEL

The utility model provides a meet dune shape steel ball coal mill material-saving welt of steel ball striking angle.

The technical scheme of the utility model is realized like this: the material-saving liner plate for the sand dune-shaped steel ball coal mill meeting the impact angle of the steel ball comprises a liner plate body, wherein the liner plate body is of a sand dune-shaped structure; the lining plate body comprises a lower arc-shaped contact surface, an upper collision impact surface and two side connection surfaces; the lower arc-shaped contact surface is connected with the inner wall of the ball mill cylinder; the two side connecting surfaces are respectively contacted with the adjacent lining plate bodies; the upper collision impact surface comprises a hill valley impact surface, a hill top impact surface and a hill slope impact surface which are continuously arranged; the thickness of the hill top impact surface is the largest, the thickness of the hill top impact surface gradually decreases from the hill top impact surface to the hill slope impact surface, and the thickness of the hill top impact surface first decreases and then increases from the hill top impact surface to the hill valley impact surface; the thickness of the tail end of the hill impact surface is equal to that of the tail end of the hill impact surface; the thickness of the lowest part of the hill impact surface is smaller than the minimum thickness of the hill impact surface.

As the preferred technical scheme, the lining plate body is connected with the inner wall of the ball mill cylinder body through bolts.

As the preferred technical scheme, two bolt holes are arranged on the impact surface of the hill top, and a bolt penetrates through each bolt hole to be connected with the inner wall of the ball mill cylinder.

As a preferred technical scheme, a wear indication hole is arranged on the impact surface of the hillside.

Due to the adoption of the technical scheme, the utility model discloses following outstanding beneficial effect has:

1. during operation of the coal mill, the hill top impact surface and the hill slope impact surface of the lining plate body face the impact direction of the steel ball, so that the abrasion and thinning speed is high, and the hill top impact surface is abraded fastest. In contrast, the hill strike face wears away at the slowest rate of thinning. The thickness of the hill top impact surface, the thickness of the hill slope impact surface and the thickness of the hill valley impact surface are gradually reduced, and the wear reduction speed of the hill top impact surface, the hill slope impact surface and the hill valley impact surface is gradually reduced,

therefore, the three parts can be better and synchronously worn to the limit value, the residual of the unworn liner plate is reduced, and the plate is saved on the whole.

2. The lining board saves board and has simple structure. The sand dune-shaped lining plate body is convenient for modeling and casting, reduces stress concentration generated in the casting process, reduces internal defects, and effectively avoids the problems of cracks and fractures in the operation of the lining plate. In addition, the sand dune-shaped lining plate body increases the contact area of the sand dune-shaped lining plate body which is impacted with the steel ball, is beneficial to grinding coal powder and can play a certain energy-saving effect.

3. The material-saving lining plate can be widely applied to a steel ball coal mill in a thermal power plant.

4. The thickness of the hill impact surface is the same with that of the end of the hill impact surface, after the lining plate bodies of the cylinder circle are fixed, the lining plate bodies are tightly butted to form a continuous and smooth multi-hill lining plate of the circle.

5. When the plate body is seriously worn and the hill is thinned to the bottom of the wear indication hole, the indication hole disappears, the lining plate is worn to the limit, and the lining plate needs to be replaced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

FIG. 1 is a front view of the present invention;

fig. 2 is a top view of the present invention;

in the figure: 1-lining board body; 2-side joint face; 3-hill valley impact surface; 4-hill top impact surface; 5-bolt holes; 6-hill strike face; 7-wear indication hole; 8-lower arc contact surface.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1 and 2, the utility model comprises a lining plate body 1, the lining plate body 1 is of a dune-shaped structure. The lining plate body 1 comprises a lower arc-shaped contact surface 8, an upper collision impact surface and two side connection surfaces 2. The lower arc-shaped contact surface 8 is connected with the inner wall of the ball mill cylinder. The two side connecting surfaces 2 are respectively contacted with the adjacent lining plate bodies 1. The upper impact collision surface comprises a hill and valley impact surface 3, a hill and top impact surface 4 and a hill and slope impact surface 6 which are arranged in series. The thickness of the hill top impact surface 4 is the largest, the thickness gradually decreases from the hill top impact surface 4 to the hill slope impact surface 6, and the thickness decreases from the hill top impact surface 4 to the hill valley impact surface 3 and then increases.

The thickness of the distal end of the hill impact surface 6 is equal to the thickness of the distal end of the hill impact surface 3. The thickness of the hill impact surface 6 is the same as that of the end of the hill impact surface 3, after the lining board bodies 1 of one circle of the cylinder body are fixed, the lining board bodies 1 are tightly butted to form a continuous and smooth multi-hill lining board of one circle. The thickness of the lowest part of the hill impact surface 3 is smaller than the minimum thickness of the hill impact surface 6.

In this embodiment, the lining plate body 1 is connected with the inner wall of the ball mill cylinder through bolts. Furthermore, two bolt holes 5 are arranged on the hill top impact surface 4, and a bolt penetrates through each bolt hole 5 to be connected with the inner wall of the ball mill cylinder. The fastened bolts are completely buried in the bolt holes 5 and protected by thick hills to be prevented from being impacted and abraded by steel balls. Further, the nut of the bolt is funnel-shaped.

In the present embodiment, a wear indication hole 7 is provided on the hill impact surface 6. When the plate body is seriously worn and the hill is thinned to the bottom of the wear indication hole 7, the indication hole disappears, the lining plate is worn to the limit, and the lining plate is required to be replaced.

When the coal mill runs, the hill top impact surface 4 and the hill slope impact surface 6 of the lining plate body 1 face the impact direction of the steel ball, so the abrasion and thinning speed is high, and the hill top impact surface 4 is abraded fastest. In contrast, the hill strike face 3 wears away at the slowest rate. The thickness of the hill top impact surface 4, the thickness of the hill slope impact surface 6 and the thickness of the hill valley impact surface 3 are gradually reduced, and the wear thinning speed of the hill top impact surface 4, the hill slope impact surface 6 and the hill valley impact surface 3 is gradually reduced, so that the hill top impact surface, the hill slope impact surface 6 and the hill valley impact surface 3 can be well and synchronously worn to a limit value, the residual of the unworn lining plate is reduced, and the plate is saved on the whole.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. Meet sand dune shape steel ball coal mill material saving welt of steel ball striking angle, its characterized in that: the lining plate comprises a lining plate body, wherein the lining plate body is of a sand dune-shaped structure; the lining plate body comprises a lower arc-shaped contact surface, an upper collision impact surface and two side connection surfaces; the lower arc-shaped contact surface is connected with the inner wall of the ball mill cylinder; the two side connecting surfaces are respectively contacted with the adjacent lining plate bodies; the upper collision impact surface comprises a hill valley impact surface, a hill top impact surface and a hill slope impact surface which are continuously arranged; the thickness of the hill top impact surface is the largest, the thickness of the hill top impact surface gradually decreases from the hill top impact surface to the hill slope impact surface, and the thickness of the hill top impact surface first decreases and then increases from the hill top impact surface to the hill valley impact surface; the thickness of the tail end of the hill impact surface is equal to that of the tail end of the hill impact surface; the thickness of the lowest part of the hill impact surface is smaller than the minimum thickness of the hill impact surface.

2. The sand dune shaped steel ball coal mill material saving liner plate meeting the steel ball impact angle according to claim 1, characterized in that: the lining plate body is connected with the inner wall of the ball mill cylinder body through bolts.

3. The sand dune shaped steel ball coal mill material saving liner plate meeting the steel ball impact angle as claimed in claim 2, wherein: two bolt holes are arranged on the impact surface of the hill top, and the bolt penetrates through each bolt hole to be connected with the inner wall of the ball mill cylinder.

4. The sand dune shaped steel ball coal mill material saving liner plate meeting the steel ball impact angle according to claim 1, characterized in that: and a wear indicating hole is arranged on the impact surface of the hillside.