Cement mill beater capable of efficiently entering mill

Abstract

The utility model relates to the technical field of cement processing, in particular to a cement mill beater capable of efficiently entering a mill, which comprises a roller press body and a beater body connected with the output end of the roller press body, and further comprises a settling chamber, the settling chamber is respectively communicated with the roller press body and the beater body through a first air pipe and a second air pipe, a dust collecting air pipe is communicated with the settling chamber, and a dust collecting fan is arranged on the dust collecting air pipe and is used for forming negative pressure in the settling chamber; according to the utility model, through the arrangement of the settling chamber, fine powder which is possibly wasted or unreasonably circulated in the beater body originally is collected, and directly enters a subsequent mill through the milling chute, so that the effective amount of the fine powder entering the mill can be increased; and invalid circulation of fine materials between the roller press body and the beater body is reduced, and the grinding efficiency of the whole system is improved.

Description

Technical Field

[0001] This utility model relates to the field of cement processing technology, and in particular to a high-efficiency cement grinding and dispersing machine. Background Technology

[0002] Cement grinding is a crucial process in cement production. The typical steps involve using a roller press to break down large pieces of pre-treated materials such as clinker, gypsum, and mixed materials into smaller particles. These particles are then dispersed in a grinder to form even finer particles before being fed into a subsequent mill for further grinding. Alternatively, coarse particles can be returned to the roller press for further dispersal. The grinding and compression process at the roller press head generates significant amounts of dust. Dust collection fans at the roller press head effectively collect this dust, preventing it from spreading throughout the workshop. The dust-laden airflow is then transported to the dust collection equipment via a pipeline system, reducing dust concentration in the workshop. This also allows the recovered cement dust to be reused in the mill or other processing stages, minimizing raw material waste and improving resource utilization throughout the production process.

[0003] Under normal circumstances, the dispersant should effectively classify materials according to their fineness, conveying fine powder to the next stage (such as the mill) and returning coarse powder to the roller press for reprocessing. However, current sampling tests show that the roller press itself has a fineness of approximately 63.4% at 180µm, while the powder returned from the dispersant has a fineness of approximately 71.4% at 80µm. The dust-laden airflow is directly discharged from the dispersant or roller press, and its velocity is usually high and the airflow is turbulent. Inside the dispersant, the classification process often relies on the difference in the airflow's carrying capacity for materials of different particle sizes. The turbulent airflow disrupts this originally relatively stable classification environment. The fine powder content in the material returned to the roller press reaches approximately 29%, which means that the fine powder that should have entered the mill is mistakenly returned to the roller press, reducing production efficiency and thus restricting the increase in cement mill output. At the same time, there are no adjustment measures for the material entering the mill during operation, resulting in large fluctuations in the quality of cement leaving the mill. Cement production switching requires shutdown and frequent adjustments to the dispersant screen and lifting plates, resulting in high labor intensity for on-site employees.

[0004] Based on the above situation, we propose a high-efficiency cement mill dispersant to solve the above problems. Utility Model Content

[0005] This invention provides a high-efficiency cement mill dispersion machine for feeding into the mill, in order to solve the problem that the fineness of the feed into the mill is too coarse in the existing technology, which restricts the increase of cement mill output.

[0006] The technical problem solved by this utility model is achieved by the following technical solution:

[0007] A high-efficiency cement mill dispersant includes a roller press body and a dispersant body connected to the output end of the roller press body, and a settling chamber. The settling chamber is connected to the roller press body and the dispersant body through a first air duct and a second air duct, respectively. A dust collection air duct is connected to the settling chamber, and a dust collection fan is installed on the dust collection air duct to create a negative pressure inside the settling chamber, which pushes the dust-laden airflow from the roller press body and the dispersant body to the settling chamber for settling. The output end of the settling chamber and the output end of the dispersant body are connected to a mill inlet chute connected to the mill input end. The mill inlet chute is used to directly input the particles settling in the settling chamber into the mill.

[0008] Preferably, the system also includes a controller and a wind speed sensor electrically connected to the controller. The wind speed sensor is installed on the dust collection duct, and a ventilation window is provided at the upper end of the settling chamber. An expansion joint is provided on the inner top wall of the ventilation window, and a sealing plate for closing the ventilation window is connected to the movable end of the expansion joint.

[0009] Preferably, both the first and second air ducts are equipped with control valves electrically connected to the controller. When the controller receives a zero wind speed electrical signal from the wind speed sensor, it closes the control valves.

[0010] Preferably, the system also includes an emergency stop switch and an alarm electrically connected to the controller. When the controller receives a zero wind speed electrical signal from the wind speed sensor, it controls the emergency stop switch and the alarm to open.

[0011] Preferably, the inner wall of the settling chamber is provided with at least two baffles, and there is a gap between the bottom end of the baffles and the bottom end of the settling chamber.

[0012] Preferably, an electric louvered valve is installed on the dust collection duct.

[0013] Preferably, the output pipe of the pulverizer body is provided with a first feeding device, and the infeed pipe is provided with a second feeding device.

[0014] The beneficial effects of this utility model are as follows: by setting up a settling chamber, the fine powder that might otherwise be wasted or improperly circulated within the main body of the disperser is collected and directly fed into the subsequent mill through the inlet chute. This increases the effective amount of fine powder entering the mill, improves the utilization rate of materials, and enables the mill to grind materials more thoroughly. This is conducive to producing finer and more stable cement products. The fine powder contained in the material that would otherwise be returned to the roller press body from the disperser body can be better utilized, reducing the ineffective circulation of fine materials between the roller press body and the disperser body, and improving the grinding efficiency of the entire system. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the isometric structure provided by this utility model;

[0017] Figure 2 This is a partial structural schematic diagram of the present invention;

[0018] Figure 3 This is a schematic cross-sectional view of the settling chamber provided by this utility model;

[0019] Figure 4 This is a system block diagram provided in this utility model.

[0020] In the diagram, 1. Roller press body; 11. First air duct; 12. Return material device; 2. Disperser body; 21. Second air duct; 3. Settling chamber; 31. Dust collection air duct; 32. Dust collection fan; 4. Grinding chute; 5. Controller; 51. Wind speed sensor; 52. Control valve; 53. Emergency stop switch; 54. Alarm; 6. Ventilation window; 61. Telescopic component; 62. Sealing plate; 7. Barrier plate; 8. Electric louvered valve; 9. First feeding device; 91. Second feeding device. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0022] Reference Figures 1-4As shown, a high-efficiency cement mill dispersant includes a roller press body 1 and a dispersant body 2 connected to the output end of the roller press body 1. The output end of the dispersant body 2 is also equipped with a mill (not shown in the figure). During production, the material is first initially crushed by the roller press body 1 and then falls into the dispersant body 2. The dispersing device inside the dispersant body 2 (such as a high-speed rotating dispersing disc, dispersing hammer, etc.) impacts, collides, and rubs the material cake, breaking it into individual particles. After passing through a grading device inside the dispersant, such as a screen, fine particles pass through the screen, while coarse particles remain on the screen. The graded fine particles are then conveyed to subsequent mills or other equipment for further grinding. The coarse particles can be returned to the roller press body 1 for re-extrusion processing via a return device 12, as shown in the figure. The return device 12 connects the output end of the roller press body 1 to the roller press body 2. The input end of the main body 1 is connected to the output end of the dispersing machine body 2 to realize a closed-loop circulation system for grinding. During the operation of the roller press body 1 and the dispersing machine body 2, a large amount of dust is generated, containing a large amount of cement raw materials or finished cement particles. If there is turbulent airflow within the dispersing machine body 2 or the roller press body 1, this fine powder may be re-introduced into the roller press body 1. The processing capacity of the roller press body 1 includes too much fine powder that does not need further compression. This fine powder occupies a certain amount of space and time in the roller press body 1, resulting in insufficient processing of the coarse particles that actually need to be compressed. Consequently, the effective amount of coarse particles entering the mill is reduced, and the mill cannot fully utilize its function of grinding coarse particles, thus reducing the output of the cement mill. Therefore, this solution makes the following improvements:

[0023] Specifically, it also includes a settling chamber 3, which is connected to the roller press body 1 and the dispersing machine body 2 via a first air duct 11 and a second air duct 21, respectively. A dust collection air duct 31 is connected to the settling chamber 3, and a dust collection fan 32 is installed on the dust collection air duct 31 to create a negative pressure inside the settling chamber 3, pushing the dust-laden airflow from the roller press body 1 and the dispersing machine body 2 into the settling chamber 3 for settling. The output end of the settling chamber 3 and the output end of the dispersing machine body 2 are connected to the mill input end. The connected feed chute 4 is used to directly input the particles settled in the settling chamber 3 into the mill. The dust collection fan 32 can be a centrifugal fan or an axial flow fan, and the appropriate fan flow rate is determined according to factors such as the specific production process, workshop area, and dust generation. When the dust collection fan 32 is running, it creates a negative pressure in the settling chamber 3, causing airflow to enter the settling chamber 3. When the dust-laden airflow enters the settling chamber 3 from the disperser body 2 and the roller press body 1, due to the air in the settling chamber 3... With a larger settling chamber, the airflow velocity decreases rapidly. In the settling chamber 3, fine particles gradually settle under gravity. For those fine particles that were originally mixed with coarse particles or dust in the dispersing machine and were not effectively separated, the settling chamber 3 provides a relatively static space environment, allowing them sufficient time and conditions to separate from the airflow. This reduces the impact of dust-laden airflow from the roller press body 1 on environmental health, while also preventing dust-laden airflow from the dispersing machine body 2 from returning to the roller press body 1. The fine particles collected and settled in the settling chamber 3 enter the subsequent mill directly through the inlet chute 4 for further grinding. At the same time, the settling chamber 3 can make the state of the dust-laden airflow more stable, reducing the impact of turbulent airflow on material classification. After passing through the settling chamber 3, the dust-laden airflow and materials entering the subsequent mill are more orderly, which helps to improve the classification accuracy of the dispersing machine, further ensuring that the fine powder can enter the mill along the correct path, improving the efficiency of the entire cement grinding system, reducing power consumption, and increasing unit output.

[0024] Reference Figure 2 as well as Figure 4As shown, further, it also includes a controller 5 and a wind speed sensor 51 electrically connected to the controller 5. The wind speed sensor 51 is installed on the dust collection duct 31, and a ventilation window 6 is provided at the upper end of the settling chamber 3. A telescopic component 61 is provided on the inner top wall of the ventilation window 6. The movable end of the telescopic component 61 is connected to a sealing plate 62 for sealing the ventilation window 6. When the dust collection fan 32 malfunctions and stops working, the dust-laden airflow in the settling chamber 3 cannot be extracted in time, and the dust in the roller press body 1 and the dispersing machine body 2 may continue to accumulate in the settling chamber. As dust accumulates continuously in the settling chamber 3, it may cause safety hazards such as explosions when the dust concentration reaches a certain level. Therefore, when the dust collection fan 32 malfunctions and cannot ventilate, the wind speed sensor 51 will send a signal to the controller 5 after detecting that there is no air in the dust collection duct 31. The controller 5 controls the telescopic component 61 to drive the sealing plate 62 to release the seal on the ventilation window 6, so that the settling chamber 3 can be temporarily ventilated to reduce safety hazards. The telescopic component 61 can be an electric telescopic rod or an electric push rod that can drive the sealing plate 62 to perform linear reciprocating motion.

[0025] Reference Figure 1 As shown, both the first duct 11 and the second duct 21 are equipped with control valves 52 electrically connected to the controller 5. When the controller 5 receives a zero wind speed electrical signal from the wind speed sensor 51, it closes the control valves 52. When the dust collector fan 32 fails to stop, the distribution of dust-laden airflow in the system becomes disordered. At this time, closing the control valves 52 can relatively isolate the areas where each section of the duct and equipment is located, such as between the roller press body 1 and the settling chamber 3, and between the disperser body 2 and the settling chamber 3, to prevent excessive dust in a certain area from being disturbed by the airflow. The dust diffuses to other areas, allowing it to settle or remain relatively stably in its respective areas. Although the normal forward transport of dust-laden airflow to settling chamber 3 and subsequent systems will be affected after the dust collection fan 32 is damaged, the air pressure balance in the system is broken, and there may be a situation of reverse airflow. For example, the dust-laden airflow that was originally left in settling chamber 3 and first air duct 11 and second air duct 21 may flow back into the scatterer body 2 or roller press body 1 due to the pressure difference. Closing the control valve 52 can effectively prevent this reverse flow.

[0026] It also includes an emergency stop switch 53 and an alarm 54 that are electrically connected to the controller 5. When the controller 5 receives a zero wind speed electrical signal from the wind speed sensor 51, it controls the emergency stop switch 53 and the alarm 54 to open. The emergency stop switch 53 can shut down the entire grinding system in time to reduce the generation of dust-laden airflow. At the same time, the alarm 54 alerts personnel to take action as soon as possible.

[0027] Reference Figure 3As shown, at least two baffles 7 are provided on the inner wall of the settling chamber 3, and there is a gap between the bottom end of the baffles 7 and the bottom end of the settling chamber 3. The baffles 7 can force the airflow to change its original relatively direct flow path, so that the airflow that may originally be rushing straight to the output end may turn downward or flow laterally after encountering the baffles 7, thereby prolonging the residence time of the airflow in the settling chamber 3, allowing the dust to settle more under the action of gravity. In addition, the baffles 7 can also promote the airflow to be more evenly dispersed in the settling chamber 3, avoiding the airflow to concentrate in certain areas and pass through quickly, making the airflow state in the entire settling chamber 3 more stable and conducive to dust settling.

[0028] Among them, the dust collection duct 31 is equipped with an electric louver valve 8. The electric louver valve 8 is a valve that can be used with an electric actuator. It can better regulate the airflow distribution and pressure in the system. When the amount of dust generated in the roller press body 1 or the scatterer changes, the electric louver valve 8 can be adjusted to maintain the stable operation of the entire ventilation system, avoid dust overflow or abnormal equipment operation caused by airflow turbulence, and ensure that the dust-laden airflow flows from the roller press body 1 and the scatterer body 2 to the settling chamber 3 and is effectively settled.

[0029] Reference Figure 1 As shown, furthermore, a first feeding device 9 is provided on the output pipe of the dispersing machine body 2. The first feeding device 9 is located after the output end of the dispersing machine body 2 and the return material device 12. It mainly focuses on the initial flow control of the material output from the dispersing machine body 2, and can cooperate with the return material device 12 to transport the material processed and circulated by the dispersing machine body 2 to the subsequent process at a suitable flow rate. It can perform the first flow rate adjustment of the material according to the output of the dispersing machine body 2 and the material status of the entire upstream production process to ensure that the material flow rate before entering the mill inlet chute 4 is relatively stable and appropriate. A second feeding device 91 is provided on the mill inlet chute 4. It is directly installed at the inlet chute 4, and focuses more on the final flow control of the material about to enter the mill. It can make the final flow adjustment of the material after a series of conveying and preliminary control according to the actual feeding needs of the mill, so as to ensure that the amount of material entering the mill fully meets the current working requirements of the mill. For example, in special cases such as mill start-up, shutdown or conversion of different products, the flow of material entering the mill can be precisely controlled. The first feeding device 9 and the second feeding device 91 can be frequency converters or adjustable speed rigid feeders, etc., which can adjust the speed of material entering the mill according to production requirements.

Claims

1. A high-efficiency cement mill dispersant, comprising a roller press body (1) and a dispersant body (2) connected to the output end of the roller press body (1), characterized in that, It also includes a settling chamber (3), which is connected to the roller press body (1) and the pulverizer body (2) respectively through the first air duct (11) and the second air duct (21). A dust collection air duct (31) is connected to the settling chamber (3), and a dust collection fan (32) is provided on the dust collection air duct (31) to create a negative pressure inside the settling chamber (3) and push the dust-laden airflow from the roller press body (1) and the pulverizer body (2) to the settling chamber (3) for settling. The output end of the settling chamber (3) and the output end of the pulverizer body (2) are connected to a mill inlet chute (4) that is connected to the mill input end. The mill inlet chute (4) is used to directly input the particles settling in the settling chamber (3) into the mill.

2. The high-efficiency cement mill dispersant according to claim 1, characterized in that, It also includes a controller (5) and a wind speed sensor (51) electrically connected to the controller (5). The wind speed sensor (51) is installed on the dust collection duct (31), and a ventilation window (6) is provided at the upper end of the settling chamber (3). A telescopic component (61) is provided on the inner top wall of the ventilation window (6), and a sealing plate (62) for sealing the ventilation window (6) is connected to the movable end of the telescopic component (61).

3. The high-efficiency cement mill dispersant according to claim 2, characterized in that, Both the first air duct (11) and the second air duct (21) are equipped with control valves (52) that are electrically connected to the controller (5). When the controller (5) receives the zero wind speed electrical signal from the wind speed sensor (51), it closes the control valves (52).

4. The high-efficiency cement mill dispersant according to claim 2, characterized in that, It also includes an emergency stop switch (53) and an alarm (54) electrically connected to the controller (5). When the controller (5) receives a zero wind speed electrical signal from the wind speed sensor (51), it controls the emergency stop switch (53) and the alarm (54) to open.

5. A high-efficiency cement mill dispersant according to claim 1, characterized in that, The inner wall of the settling chamber (3) is provided with at least two baffles (7), and there is a gap between the bottom end of the baffles (7) and the bottom end of the settling chamber (3).

6. The high-efficiency cement mill dispersant according to claim 1, characterized in that, An electric louver valve (8) is installed on the dust collection duct (31).

7. A high-efficiency cement mill dispersant according to claim 1, characterized in that, The output pipe of the pulverizer body (2) is provided with a first feeding device (9), and the mill inlet pipe (4) is provided with a second feeding device (91).

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