Coal mill

Abstract

The utility model discloses a coal mill. The coal mill comprises a feeding assembly, a grinding assembly, a drying and conveying assembly, a screening assembly and a secondary discharging assembly. The output end of the feeding assembly is arranged above the grinding assembly, and raw materials can be conveyed to the grinding assembly to be ground. The drying and conveying assembly is arranged between the grinding assembly and the screening assembly and can convey the ground mixture to the screening assembly for screening; the secondary discharging assembly comprises a temporary storage hopper, a rotary material shifting device and a secondary discharging hopper. The buffer hopper is arranged at the coarse material output end of the screening assembly; and the rotary material shifting device is arranged between the temporary storage hopper and the secondary discharging hopper, and coarse materials in the temporary storage hopper can be sequentially discharged into the feeding assembly. According to the coal mill, coarse materials screened in the coal mill can be output in order and converged with raw materials in the chute, the blocking condition is avoided, the productivity of the coal mill is improved, the slag discharging amount of the coal mill is reduced, and the use efficiency of the coal mill is improved.

Description

Technical Field

[0001] The present application relates to the technical field of coal mills, and in particular to a coal mill. Background Art

[0002] The pulverized coal preparation system is a system that provides heat source for cement clinker calcination. The raw coal is fed into the coal mill system through the raw coal bin and the quantitative feeder, and is dried and ground in the mill. The pulverized coal is carried into the dynamic powder selector of the coal mill by the gas from the mill. The separated coarse powder returns to the mill head for re-grinding, and the fine powder enters the bag dust collector of the coal mill with the gas. The collected pulverized coal is sent to the pulverized coal bin with a load sensor. The pulverized coal preparation system uses the exhaust gas at the kiln tail as the drying heat source. There is a decomposition furnace and a kiln head coal feeding metering system under the pulverized coal bin. The metered pulverized coal is pneumatically transported to the decomposition furnace burner at the kiln tail and the multi-channel pulverized coal burner at the kiln head.

[0003] The working principle of the coal mill in the prior art is generally to lower the raw materials to the grinding disc through the chute, and then grind the raw materials by the rotation of the grinding roller on the grinding disc, and then convey the ground mixture to the screening machine for screening by introducing hot air, and the screened fine material is output from the product port, and the screened coarse material returns to the chute again, thereby merging with the raw materials in the chute and entering the grinding disc for grinding again, so that the coarse material can be ground for the second time. However, when the coarse material screened by the screening machine merges with the chute, since there are more raw materials in the chute and the coarse material is output from the screening machine in a disorderly manner, it is easy to get blocked during the merger, which is not conducive to the normal use of the coal mill. Generally, it is necessary to clear the blockage of the coarse material output by the screening machine. Utility Model Content

[0004] The embodiment of the present application provides a coal mill, which solves the problem in the prior art that after the screening machine in the coal mill separates the coarse material and the fine material, the coarse material is easily blocked when merging with the raw materials in the chute due to the disordered merging. The coarse material after screening in the coal mill can be output in an orderly manner and merged with the raw materials in the chute, thus avoiding blockage and improving the utilization efficiency of the coal mill.

[0005] The utility model embodiment provides a coal mill, including a feeding component, a grinding component, a drying and conveying component, a screening component and a secondary unloading component; the output end of the feeding component is arranged above the grinding component, and can convey the raw materials to the grinding component for grinding; the drying and conveying component is arranged between the grinding component and the screening component, and can convey the ground mixture to the screening component for screening; the secondary unloading component includes a buffer bucket, a rotary material feeding device and a secondary unloading hopper; the buffer bucket is arranged at the coarse material output end of the screening component; the rotary material feeding device is arranged between the buffer bucket and the secondary unloading hopper, and can orderly drain the coarse material in the buffer bucket to the inside of the feeding component.

[0006] In one possible implementation, the feed assembly includes a chute and an air lock valve; the air lock valve is provided at the input end of the chute, and the output end of the chute is located above the grinding assembly; a lower leakage port is provided on the trough wall of the chute, and the output end of the secondary hopper is plugged into the lower leakage port, so that the coarse material in the secondary hopper can be discharged into the chute.

[0007] In one possible implementation, the grinding assembly includes a grinding disc and a plurality of grinding rollers; the plurality of grinding rollers are arranged on the top surface of the grinding disc in a circular array about the axis of the grinding disc, and are capable of grinding the raw materials falling onto the grinding disc; the output end of the chute extends above the grinding rollers.

[0008] In a possible implementation, the rotary material shifting device includes a buffer plate, a rotating part and a rotating blade; the buffer plate is fixedly connected to the interior of the buffer bucket, and a leakage hole is opened on the buffer plate; the body of the rotating part is embedded in the interior of the buffer plate, and the output end of the rotating part is fixedly connected to the rotating blade; the rotating blade is located on the top surface of the buffer plate and is fixedly connected to the output end of the rotating part, and can shift the coarse material on the buffer plate, and can pass the coarse material through the leakage hole in an orderly manner and enter the secondary discharge hopper.

[0009] In a possible implementation, the drying and conveying component includes a hot air source, an annular chamber and a conveying channel; the annular chamber is sleeved on the outside of the grinding component, and the annular chamber is also provided with an air inlet; the top of the annular chamber is connected to the storage space of the grinding component; the conveying channel is arranged above the center of the grinding component, and the input end of the conveying channel is connected to the storage space of the grinding component, and the output end of the conveying channel is connected to the screening component.

[0010] In a possible implementation, an embodiment of the utility model provides a coal mill which also includes a fine material outlet; the fine material output end of the screening assembly is connected to the fine material outlet.

[0011] One or more technical solutions provided in the embodiments of the present utility model have at least the following technical effects or advantages:

[0012] The embodiment of the utility model adopts a feeding component, a grinding component, a drying and conveying component, a screening component and a secondary material discharge component; wherein the secondary material discharge component includes a buffer bucket, a rotary material-dispensing device and a secondary material discharge hopper; the buffer bucket is arranged at the coarse material output end of the screening component; the rotary material-dispensing device is arranged between the buffer bucket and the secondary material discharge hopper, and the coarse material output from the screening component to the buffer bucket can be orderly dialed through the continuous rotation of the rotary material-dispensing device, so that the coarse material in the buffer bucket can be orderly discharged into the interior of the feeding component, thereby avoiding the disordered output of the coarse material causing blockage with the raw materials in the feeding component;

[0013] The invention effectively solves the problem in the prior art that after the screening machine in the coal mill separates the coarse material and the fine material, the coarse material is easily blocked when merging with the raw material in the chute due to disordered merging. The invention realizes that the coarse material after screening in the coal mill can be output in an orderly manner and merged with the raw material in the chute, thus avoiding blockage and improving the utilization efficiency of the coal mill. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments of the utility model or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 A schematic diagram of the main structure of a coal mill provided in an embodiment of the present application;

[0016] Figure 2 for Figure 1 A partial enlarged view of the middle A area;

[0017] Figure 3 A top view of the rotary material transfer assembly provided in an embodiment of the present application.

[0018] Icons: 1-feeding assembly; 11-chute; 12-air lock valve; 13-lower leakage port; 2-grinding assembly; 21-grinding disc; 22-grinding roller; 3-drying and conveying assembly; 31-annular chamber; 32-conveying channel; 4-screening assembly; 5-secondary unloading assembly; 51-buffer; 52-rotating material shifting assembly; 521-buffer plate; 522-rotating part; 523-rotating fan blade; 524-leakage hole; 53-secondary unloading hopper; 6-fine material outlet. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] In the description of the embodiments of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. The terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0021] Reference Figure 1-Figure 3The utility model provides a coal mill, including a feed assembly 1, a grinding assembly 2, a drying and conveying assembly 3, a screening assembly 4 and a secondary unloading assembly 5; the output end of the feed assembly 1 is arranged above the grinding assembly 2, and can convey the raw material to the grinding assembly 2 for grinding; the drying and conveying assembly 3 is arranged between the grinding assembly 2 and the screening assembly 4, and can convey the ground mixed material to the screening assembly 4 for screening; the secondary unloading assembly 5 includes a buffer hopper 51, a rotary material-dispensing device and a secondary unloading hopper 53; the buffer hopper 51 is arranged at the coarse material output end of the screening assembly 4; the rotary material-dispensing device is arranged between the buffer hopper 51 and the secondary unloading hopper 53, and can convey the mixed material in the buffer hopper 51 to the secondary unloading hopper 53; The coarse material leaks down to the inside of the feeding component 1 in an orderly manner; the feeding component 1 includes a chute 11 and an air lock valve 12; the input end of the chute 11 is provided with an air lock valve 12, and the output end of the chute 11 is located above the grinding component 2; a lower leak port 13 is provided on the trough wall of the chute 11, and the output end of the secondary hopper 53 is plugged into the lower leak port 13, so that the coarse material in the secondary hopper 53 can be leaked down into the chute 11; the grinding component 2 includes a grinding disc 21 and a plurality of grinding rollers 22; the plurality of grinding rollers 22 are arranged on the top surface of the grinding disc 21 in a circular array about the axis of the grinding disc 21, so that the raw materials falling onto the grinding disc 21 can be ground; the output end of the chute 11 extends above the grinding roller 22. Specifically, in the embodiment of the present application, the raw material enters from the air lock valve 12 at the input end of the chute 11, and then slides down from the chute 11 to the grinding component 2 for grinding, and then the drying and conveying component 3 is started to dry the ground material, and at the same time, the dried material is conveyed to the screening component 4, and the screening component 4 separates the fine material and the coarse material in the mixed material, and first outputs the coarse material to the buffer bucket 51, and then the rotary material shifting device is controlled to shift the coarse material in the buffer bucket 51 in an orderly manner, so that the coarse material in the buffer bucket 51 can be orderly leaked to the inside of the feeding component 1, so as to avoid the disordered output of the coarse material and the feed component 1 is clogged; by setting up a buffer hopper 51, the coarse material output from the screening component 4 can be temporarily stored, and by setting up a rotating material-dispensing component 52 and a secondary material-discharging hopper 53, the coarse material in the buffer hopper 51 can be orderly shifted, so that the coarse material can orderly pass through the secondary material-discharging hopper 53 and then merge with the raw material in the chute 11; wherein, the buffer hopper 51 is directly connected to the output end of the screening component 4, and the secondary material-discharging hopper 53 is directly connected to the inside of the chute 11 and is integrally formed with the chute 11; in addition, in the embodiment of the present application, the lining plate of the grinding disc 21 and the roller sleeve of the grinding roller 22 are also replaced. After the coal mill has been running for a long time, the roller sleeve of the grinding roller 22 and the lining plate of the grinding disc 21 are severely worn, resulting in a reduction in the grinding capacity. After replacing the lining plate of the grinding disc 21 and the roller sleeve of the grinding roller 22, the grinding capacity of the mill is improved and the slag discharge of the coal mill is reduced.The grinding roller seals on both sides of the coal mill were modified, and the original skin seals were replaced with new nano-silicone material seals, which can not only meet the overall sealing requirements of the equipment, but also meet the requirements of material wear resistance, and solve the problem of low mill output and large slag discharge caused by air leakage at the coal mill grinding rollers.

[0022] Reference Figure 2-Figure 3 The rotary material shifting device includes a buffer plate 521, a rotating part 522 and a rotating blade 523; the buffer plate 521 is fixedly connected to the inside of the buffer bucket 51, and a leak hole 524 is opened on the buffer plate 521; the body of the rotating part 522 is embedded in the inside of the buffer plate 521, and the output end of the rotating part 522 is fixedly connected to the rotating blade 523; the rotating blade 523 is on the top surface of the buffer plate 521 and is fixedly connected to the output end of the rotating part 522, which can shift the coarse material on the buffer plate 521, and can pass the coarse material through the leak hole 524 in an orderly manner and enter the secondary discharge hopper 53. Specifically in the embodiment of the present application, the rotating part 522 uses a motor, and a mounting groove is provided on the top surface of the buffer plate 521, the body of the rotating part 522 is embedded in the mounting groove, and the output end of the rotating part 522 extends out of the mounting groove and is fixedly connected to the three rotating blades 523, thereby driving the three rotating blades 523 to rotate and move on the top surface of the buffer plate 521. During the moving process, the coarse material on the buffer plate 521 can be gradually moved to the leakage hole 524, so that it can be orderly leaked to the secondary discharge hopper 53, and then enter the chute 11 through the secondary discharge hopper 53, and merge with the raw materials in the chute 11; specifically, the leakage hole 524 is eccentrically arranged on the buffer plate 521.

[0023] Reference Figure 1 , the drying and conveying assembly 3 includes a hot air source, an annular chamber 31 and a conveying channel 32; the annular chamber 31 is sleeved on the outside of the grinding assembly 2, and the annular chamber 31 is also provided with an air inlet; the top of the annular chamber 31 is connected to the storage space of the grinding assembly 2; the conveying channel 32 is arranged above the center of the grinding assembly 2, and the input end of the conveying channel 32 is connected to the storage space of the grinding assembly 2, and the output end of the conveying channel 32 is connected to the screening assembly 4; it also includes a fine material outlet 6; the fine material output end of the screening assembly 4 is connected to the fine material outlet 6. Specifically in the embodiment of the present application, the hot air source passes through the external hot air and is sprayed into the annular chamber 31 by the nozzle ring, and the hot air introduced into the annular chamber 31 is detoured to the top of the grinding assembly 2, and then the ground mixed material on the grinding disc 21 is lifted upward from the conveying channel 32 and conveyed to the screening assembly 4, the screening assembly 4 uses a commonly used screening machine in the art, the coarse material after screening enters the buffer 51, and the fine material after screening is output from the fine material outlet 6 to form a product.

[0024] In the embodiment of the present application, the nozzle ring is also replaced (specification model: HRM1900), and the angle of the nozzle ring is adjusted; the original angle of the coal mill nozzle ring nozzle blade is 45°, which is too small relative to the horizontal plane, affecting the air intake and easily causing poor slag discharge, thereby causing slag blockage and the risk of spontaneous combustion of slag coal. In order to solve the above problems, the angle of the coal mill nozzle ring nozzle blade relative to the horizontal plane is changed from 45° to 60°. After the transformation, the air intake is increased, the slag discharge is smooth, and the hidden danger of spontaneous combustion caused by slag coal blockage is eliminated. In addition, the present application specifically installs a raw coal crusher to reduce the particle size of the raw coal. Add a crusher before the raw coal enters the first and second line systems, that is, add a crusher to the raw coal tubular head and tail (a total of two). The specific implementation method is as follows: a four-way pipe is added to the lower part of the raw coal belt conveyor head of the first line, one chute is sent to the first line feeding belt conveyor through the crusher, one chute can be directly sent to the first line feeding belt conveyor, and the other chute is sent to the tubular machine to supply coal to the second line; a three-way pipe is added to the lower part of the tubular machine head of the second line, one chute is sent to the second line feeding belt conveyor through the crusher, and the other chute can be directly sent to the second line feeding belt conveyor. Move the coal mill grinding disc 21 retaining ring 100mm outward (nozzle ring side). The original welding position of the retaining ring of the second line coal mill grinding disc 21 is close to the edge of the grinding disc liner, and the height of the retaining ring is 100mm. The retaining ring is close to the contact surface between the grinding roller and the grinding disc, resulting in the system wind being unable to swirl the material normally; moving the grinding disc retaining ring 100mm outward (nozzle ring side) can solve the above problems and reduce the amount of coal mill slag discharge. Compared with the prior art, the present application can achieve a coal mill slag discharge of ≤0.6 tons / day and a coal mill production capacity of ≥15t / h, thereby improving the operating stability of the coal mill.

[0025] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0026] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. A coal mill, characterized in that: It comprises a feeding component (1), a grinding component (2), a drying and conveying component (3), a screening component (4) and a secondary unloading component (5); The output end of the feed component (1) is arranged above the grinding component (2) and is capable of conveying raw materials to the grinding component (2) for grinding; The drying and conveying component (3) is arranged between the grinding component (2) and the screening component (4), and is capable of conveying the ground mixed material to the screening component (4) for screening; The secondary material discharge assembly (5) comprises a buffer hopper (51), a rotary material feeding device and a secondary material discharge hopper (53); The buffer bucket (51) is arranged at the coarse material output end of the screening assembly (4); The rotary material-discharging device is arranged between the buffer hopper (51) and the secondary material-discharging hopper (53), and can orderly discharge the coarse materials in the buffer hopper (51) into the interior of the feeding assembly (1).

2. The coal mill according to claim 1, characterized in that: The feed assembly (1) comprises a chute (11) and an air lock valve (12); The air lock valve (12) is provided at the input end of the chute (11), and the output end of the chute (11) is located above the grinding assembly (2); A lower leakage port (13) is provided on the trough wall of the chute (11), and the output end of the secondary material discharge hopper (53) is plugged into the lower leakage port (13), so that the coarse material in the secondary material discharge hopper (53) can be discharged into the chute (11).

3. The coal mill according to claim 2, characterized in that: The grinding assembly (2) comprises a grinding disc (21) and a plurality of grinding rollers (22); A plurality of grinding rollers (22) are arranged on the top surface of the grinding disc (21) in a ring array about the axis of the grinding disc (21), and are capable of grinding raw materials that fall onto the grinding disc (21); The output end of the chute (11) extends above the grinding roller (22).

4. The coal mill according to claim 1, characterized in that: The rotary material-shifting device comprises a buffer plate (521), a rotating portion (522) and a rotating blade (523); The buffer plate (521) is fixedly connected to the inside of the buffer bucket (51), and a leakage hole (524) is opened on the buffer plate (521); The body of the rotating part (522) is embedded in the interior of the buffer plate (521), and the output end of the rotating part (522) is fixedly connected to the rotating blade (523); The rotating blade (523) is located on the top surface of the buffer plate (521) and is fixedly connected to the output end of the rotating part (522), and can move the coarse material on the buffer plate (521), and can allow the coarse material to pass through the leakage hole (524) in an orderly manner and enter the secondary hopper (53).

5. The coal mill according to claim 1, characterized in that: The drying and conveying assembly (3) comprises a hot air source, an annular chamber (31) and a conveying channel (32); The annular chamber (31) is sleeved on the outside of the grinding assembly (2), and the annular chamber (31) is also provided with an air inlet; The top of the annular chamber (31) is connected to the storage space of the grinding assembly (2); The conveying channel (32) is arranged above the center of the grinding component (2), and the input end of the conveying channel (32) is connected to the storage space of the grinding component (2), and the output end of the conveying channel (32) is connected to the screening component (4).

6. The coal mill according to claim 1, characterized in that: Also includes a fine material outlet (6); The fine material output end of the screening assembly (4) is in communication with the fine material outlet (6).

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