Coal mill lining plate

Abstract

The utility model discloses a coal mill lining plate, the mounting surface of the lining plate and the contact surface of a coal mill cylinder are corresponding cambered surfaces, the surface opposite to the mounting surface is a working surface, the lining plate further comprises a first bulge and a second bulge which are formed on the working surface and are distributed at an interval, the first bulge is positioned at the ball end of the working surface, and the second bulge is positioned at the ball end of the working surface. The second protrusion is located between the first protrusion and the back ball end of the lining plate, and the crest height of the first protrusion is larger than that of the second protrusion. A first working section is formed between the first protrusion and the second protrusion, and a second working section is formed between the second protrusion and the end face of the back ball end of the lining plate. The coal mill lining plate provided by the utility model can improve the kinetic energy of the lining plate for doing work with the ball, improve the grinding efficiency, improve the output of the mill and reduce the energy consumption, and can be applied to the grinding of coal with high moisture content.

Description

TECHNICAL FIELD

[0001] The utility model relates to a coal mill lining plate. BACKGROUND

[0002] The coal mill is a kind of grinding equipment widely used in the field of electric power, and its working principle is that the barrel of the coal mill rotates at a certain speed, the grinding ball at the bottom is attached to the lining plate of the barrel under the action of centrifugal force and friction force, and when the grinding ball is brought to a certain height, it is thrown down due to its own gravity to impact and crush the material at the bottom of the barrel.

[0003] The running efficiency of the coal mill is mainly affected by the lining plate and the steel ball, and the influence of the lining plate on the efficiency of the coal mill includes the waveform of the lining plate and the material quality of the lining plate. The reasonable design of the waveform of the lining plate is the key to ensure the ball-carrying capacity of the lining plate. The waveform design has strong ball-carrying capacity, which can effectively increase the number of working steel balls and the falling state of the steel balls, thereby affecting the loading capacity of the steel balls. When the output is kept unchanged, the loading capacity of the steel balls can be effectively reduced, thereby reducing the load of the coal mill and reducing the running current. Or when the original loading capacity of the steel balls is kept unchanged, the grinding output of the coal mill can be effectively improved. The reduction of current or the increase of output can effectively reduce the power consumption of the coal mill, and achieve the effect of energy saving of the coal mill.

[0004] The grinding efficiency of the coal mill is related to the moisture content, and the higher the moisture content, the worse the grinding efficiency, so it is necessary to make enough hot air enter the gap between the steel balls. For coal with moisture content less than 5%, 50-60mm steel balls are usually added to meet the output demand, and the first choice is smooth lifting lining plate. However, for coal with high moisture content (moisture content> 5%), the lining plate needs to provide more kinetic energy for the steel balls to make more collisions between the steel balls and the coal, and a larger gap is needed to ensure sufficient drying. Obviously, for coal with moisture content higher than 5%, the conventional smooth lifting lining plate cannot solve the technical problem.

[0005] Therefore, it is necessary to provide a new lining plate to solve the above technical problems. UTILITY MODEL CONTENT

[0006] The utility model solves the technical problem to provide a coal mill lining plate, which can improve the kinetic energy of the lining plate for carrying and working the balls, improve the grinding efficiency, increase the output of the mill, reduce the energy consumption, and be applied to the grinding of coal with high moisture content.

[0007] The technical scheme of the utility model is as follows:

[0008] A coal mill liner, the mounting surface of the liner is in contact with the corresponding arc surface of the coal mill cylinder, and the surface opposite to the mounting surface is the working surface, the liner further comprises a first protrusion and a second protrusion formed on the working surface and spaced apart, the first protrusion is located at the ball end of the working surface, the second protrusion is located between the first protrusion and the back ball end of the liner, and the peak height of the first protrusion is higher than that of the second protrusion; the first working section is formed between the first protrusion and the second protrusion, and the second working section is formed between the second protrusion and the end surface of the back ball end of the liner.

[0009] Further, the peak height of the first protrusion is 1-2 times the peak height of the second protrusion.

[0010] Further, the peak height of the first protrusion is 1-2 times the peak height of the second protrusion.

[0011] Further, the length of the first working section is 1.0-2.5 times the length of the second working section.

[0012] Further, the ball surface of the first protrusion is an inclined surface with an inclination angle of 110-160°, and the ball surface of the second protrusion is an inclined surface with an inclination angle of 110-160°.

[0013] Further, the first protrusion is in the shape of a trapezoid, the second protrusion is in the shape of a trapezoid or a wave, and the base angle of the first protrusion and the second protrusion is 20°-70°.

[0014] Further, the working surface of the first working section and the second working section adopts a smooth curved surface transition.

[0015] Compared with the prior art, the coal mill liner has the beneficial effects that:

[0016] First, the coal mill liner provided by the utility model improves the grinding efficiency by setting two protrusion structures on the working surface, and the peak height of the protrusion located at the ball end is higher than that of the other protrusion, thereby throwing the steel ball to the farthest end of the material in the working process of the liner, providing more kinetic energy for the steel ball, making the steel ball collide with the coal more, and applying the liner to the grinding of coal with high moisture content and improving the grinding efficiency.

[0017] Second, the coal mill liner provided by the utility model reduces the working dead zone of the liner by dividing the working surface of the liner into two working sections by the two protrusions, which is equivalent to increasing the working interval of the working surface, thereby being beneficial to the drying of the coal, further improving the output of the mill, and reducing the energy consumption.

[0018] Third, the utility model provides a coal mill lining plate, the first convex wave crest height is set according to coal mill rotating speed to be 1-2% of coal mill diameter, effectively improved the ball height of lining plate, thereby improved the crushing efficiency of coal mill. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the embodiment description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor.

[0020] Figure 1 It is the structure schematic diagram of one of the embodiments of the coal mill lining plate of the utility model;

[0021] Figure 2 It is the structure schematic diagram of another embodiment of the coal mill lining plate of the utility model. DETAILED DESCRIPTION

[0022] In order to make the personnel in the technical field better understand the technical scheme in the embodiments of the utility model, and make the above purpose, features and advantages of the utility model more obvious and easy to understand, the specific implementation of the utility model will be further described below in conjunction with the drawings.

[0023] It needs to be explained here that the description of these embodiments is used to help understanding the utility model, but does not constitute the limitation of the utility model.In addition, the technical features involved in each embodiment of the utility model described below can be combined as long as they do not conflict with each other.

[0024] Please refer to Figure 1 And Figure 2 Wherein Figure 1 It is the structure schematic diagram of one of the embodiments of the coal mill lining plate of the utility model; Figure 2is another embodiment structure diagram of the coal mill lining plate. The coal mill lining plate provided by the utility model has a mounting surface 1 and an arc contact surface with a coal mill cylinder, namely, the mounting surface 1 is tightly attached to the inner wall of the coal mill cylinder after the lining plate is installed; and the side opposite to the mounting surface 1 is a working surface (not numbered). The lining plate further comprises first protrusions 3 and second protrusions 4 formed on the working surface and distributed at intervals, wherein the first protrusions 3 are located at the ball end of the lining plate, the second protrusions 4 are located between the first protrusions and the ball end of the lining plate, so that the first protrusions 3 and the second protrusions 4 divide the working surface of the lining plate into two working sections, wherein a first working section 5 is formed between the first protrusions 3 and the second protrusions 4, and a second working section 6 is formed between the second protrusions 4 and the end surface of the ball end of the lining plate. The top surface of the first protrusions 3 and the second protrusions 4 has a certain drop from the lowest part of the working surface, so that the ball rotates in the working state.

[0025] In order to further express the structure of the lining plate in the utility model, the distance from the highest part of the protrusion to the mounting surface of the lining plate is defined as the wave crest height H, correspondingly, the wave crest height of the first protrusion is H1, and the wave crest height of the second protrusion is H2. The length of the working surface between the first protrusion and the second protrusion is defined as the length L1 of the first working section, and the length of the working surface from the second protrusion to the end surface of the ball end of the lining plate is defined as the length L2 of the second working section.

[0026] In the utility model, the wave crest height H1 of the first protrusion is higher than the wave crest H2 of the second protrusion, the wave crest height H1 of the first protrusion is 1%-2% of the diameter of the coal mill, the reasonable wave crest height of the first protrusion makes the lining plate throw the steel ball to the farthest end of the material in the working state, so that more kinetic energy is provided for the steel ball, more collisions between the steel ball and the coal occur, the utility model is applied to the grinding of coal with high moisture content, and the grinding efficiency is improved; the steel ball not thrown out by the first protrusion is thrown out again by the second protrusion, the rolling of the grinding ball is enhanced, the dead zone of the lining plate is reduced, and the grinding efficiency of the lining plate is further improved. Preferably, the wave crest height H1 of the first protrusion is 1.0-2.0 times the wave crest height H2 of the second protrusion.

[0027] In the utility model, the first working section formed between the first protrusion 3 and the second protrusion 4 is the working section mainly throwing out the steel ball for grinding, so the interval range of the first working section is greater than that of the second working section. Preferably, the length L1 of the first working section is 1.0-2.5 times the length L2 of the second working section, so that the grinding efficiency is maximized.

[0028] The first protrusion 3 and the second protrusion 4 have the function of carrying balls, and therefore the ball-carrying surfaces thereof are designed as inclined surfaces, so that the ball-carrying amount can be improved.

[0029] In the utility model, the first protrusion 3 is in the shape of a trapezoid, and the second protrusion 4 is in the shape of a trapezoid or a wave shape. Figure 2

[0030] In the utility model, the working surface of the first working section is transitioned by a smooth curved surface, and the working surface of the second working section is transitioned by a smooth curved surface.

[0031] The lining plate is fixed by the bolt passing through the mounting hole.

[0032] Compared with the prior art, the lining plate of the coal mill has the beneficial effects that:

[0033] Firstly, the lining plate of the coal mill is provided with two protrusion structures on the working surface, and the protrusion at the ball-carrying end has a higher wave peak height than the other protrusion, so that the wave peak height of the protrusion at the ball-carrying end is increased, the steel balls are thrown to the farthest end of the material during the working of the lining plate, so that the steel balls are provided with more kinetic energy, more collisions between the steel balls and the coal are caused, the lining plate is applied to the grinding of coal with high moisture content, and the grinding efficiency is improved; the working surface of the lining plate is divided into two working sections by the two protrusions, the second protrusion is used for enhancing the rolling of the grinding ball, so that the dead working area of the lining plate is reduced, and the grinding efficiency of the lining plate is further improved; and the wave peak height of the first protrusion is optimized, the ball-carrying height of the lining plate is increased, and the crushing efficiency of the coal mill is further improved.

[0034] Secondly, the lining plate of the coal mill is divided into two working sections by the two protrusions, so that the dead working area of the lining plate is reduced, that is, the working interval of the working surface is increased, so that the coal is dried, the output of the mill is further improved, and the energy consumption is reduced.

[0035] Compared with the traditional lining plate, the output of the mill can be increased by about 10%, and the power consumption can be reduced by 10-15% under the same output. ​

[0036] The embodiments of the present application are described in detail in conjunction with the accompanying drawings, but the present application is not limited to the described embodiments. For those skilled in the art, various changes, modifications, replacements and variations of the embodiments without departing from the principles and spirits of the present application are still within the protection scope of the present application.

Claims

1. A coal pulverizer liner plate, the installation surface of the liner plate being in contact with the corresponding arc surface of the coal pulverizer cylinder, and the surface opposite to the installation surface being the working surface, characterized in that, The liner further comprises first and second projections formed on the working surface and spaced apart, the first projection being located at the ball end of the working surface, and the second projection being located between the first projection and the back ball end of the liner, the first projection having a wave height higher than that of the second projection; a first working section is formed between the first and second projections, and a second working section is formed between the second projection and the end surface of the back ball end of the liner.

2. The coal mill liner plate of claim 1, wherein, The wave height of the first projection is 1-2 times that of the second projection.

3. The coal mill liner plate of claim 2, wherein, The wave height of the first projection is 1%-2% of the diameter of the coal mill.

4. The coal mill liner plate of claim 1, wherein, The length of the first working section is 1.0-2.5 times that of the second working section.

5. The coal mill liner plate of claim 1, wherein, The ball surface of the first projection is an inclined surface with an inclination angle of 110-160°, and the ball surface of the second projection is an inclined surface with an inclination angle of 110-160°.

6. The coal mill liner plate of claim 5, wherein, The first projection is in the shape of a trapezoid, and the second projection is in the shape of a trapezoid or a wave, and the bottom angle of the first and second projections is 20°-70°.

7. The coal mill liner plate according to any one of claims 1-6, characterized in that, The working surface of the first and second working sections adopts a smooth curved surface transition.

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