A vertical mill center stabilizing and discharging device

Abstract

The utility model relates to the technical field of vertical mill blanking, concretely to a vertical mill center stable blanking device, including vertical mill and spitting residue elevator, the inner wall detachable connection of vertical mill has center blanking pipe, the inside rotation of vertical mill is connected with millstone, the upper end welding of millstone has spiral stable material cone, and the upper end of spiral stable material cone with the lower surface of center blanking pipe each other corresponds, the outer surface fixed connection of spiral stable material cone has screw groove, and one end of center blanking pipe passes out the one side flange connection of vertical mill has first feed pipe. This vertical mill center stable blanking device, through the cooperation setting of millstone and spiral stable material cone, when using, the material directly slides through the conical structure barrier, guides the material along the conical surface and slowly diffuses, and the screw groove of outer surface further optimizes material flow trajectory, ensures that material evenly distributes to millstone surface, and lays the foundation for stable material layer formation.

Description

Technical Field

[0001] This utility model relates to the field of vertical mill feeding technology, specifically a vertical mill center stable feeding device. Background Technology

[0002] In the raw meal preparation stage of cement production, the raw meal vertical mill, as the core grinding equipment, directly determines the capacity and cost control of the entire production line through its operational stability and efficiency. The raw meal vertical mill follows the industry's mature core workflow and achieves closed-loop material conveying through an airlock feeding device. The airlock feeding device undertakes the dual functions of quantitative material control and airlock sealing. Through the frequency-controlled scraper or dividing wheel mechanism, the feeding amount can be adjusted according to the real-time load of the vertical mill, avoiding grinding stagnation due to overfeeding or empty grinding due to underfeeding. At the same time, the closed structure can completely block the airflow exchange between the inside of the vertical mill and the external environment, preventing the negative pressure inside the mill from being destroyed due to air leakage. This ensures that the material enters the central feed pipe of the mill accurately in an environment free from impurities and airflow interference. Then, with the help of the centrifugal force generated by the high-speed rotation of the grinding disc, the material is evenly spread on the top of the grinding disc of the vertical mill, laying the foundation for subsequent grinding, drying and other processes.

[0003] However, existing technologies have the following problems in practical use; Currently, the raw material vertical mill uses a central feed pipe to directly unload materials onto the top of the mill disc. This results in poor material dispersion, causing instability in the mill's material layer, leading to high mill vibration values ​​and poor work output during mill operation. Furthermore, frequent vibrations during mill operation can easily cause the fixing bolts of the internal baffle ring to break, which in turn causes the baffle ring to fall off, affecting the long-term stable operation of the mill and directly impacting the quality of clinker calcination. Utility Model Content

[0004] (a) Technical problems to be solved To overcome the aforementioned deficiencies in the prior art, this utility model provides a central stable feeding device for a vertical mill. This solves the problems mentioned in the background art, where current raw material vertical mills use a central feeding pipe to directly unload materials onto the top of the grinding disc, resulting in poor material dispersion, unstable mill material layer, high mill vibration values, poor mill work output, and frequent vibration during mill operation, which can easily cause the fixing bolts of the inner baffle ring of the vertical mill to break, leading to the baffle ring falling off and affecting the long-term stable operation of the mill, while also directly affecting the quality of clinker calcination.

[0005] (II) Technical Solution To achieve the above objectives, this utility model is implemented through the following technical solution: a vertical mill center stabilizing feeding device, including a vertical mill and a slag discharge elevator, wherein a center feeding pipe is detachably connected to the inner wall of the vertical mill, a grinding disc is rotatably connected inside the vertical mill, a spiral stabilizing cone is welded to the upper end of the grinding disc, and the upper end of the spiral stabilizing cone corresponds to the lower surface of the center feeding pipe, a threaded groove is fixedly connected to the outer surface of the spiral stabilizing cone, and one end of the center feeding pipe passes through a flange on one side of the vertical mill and is connected to a first feed pipe.

[0006] Preferably, the lower end of the vertical mill is detachably connected to a coarse material outlet pipe, the outer surface of the coarse material outlet pipe is detachably connected to an airlock valve, and the other end of the coarse material outlet pipe is provided with a first belt conveyor, the other end of the first belt conveyor being correspondingly provided with the input end of the slag discharge elevator.

[0007] Preferably, the output end of the slag discharge elevator is provided with a second belt conveyor, and one end of the second belt conveyor is correspondingly arranged with the other end of the first feed pipe.

[0008] Preferably, grinding rollers are symmetrically arranged at the upper end of the grinding disc, the outer surface of the grinding rollers is in contact with the upper surface of the grinding disc, the number of grinding rollers is 2-4, and the grinding rollers are arranged in a circular array along the axis of the grinding disc.

[0009] Preferably, the height of the spiral material stabilizing cone is 500mm, and the distance between the upper end of the spiral material stabilizing cone and the lower surface of the central feed tube is 285mm-300mm.

[0010] Preferably, the threaded groove extends spirally downward along the outer surface of the spiral material stabilizing cone, and the width of the threaded groove gradually increases from top to bottom along the axial direction of the spiral material stabilizing cone, with the groove width varying from 80mm to 150mm.

[0011] Preferably, the airlock valve is a pneumatic airlock valve or an electric airlock valve.

[0012] (III) Beneficial Effects This utility model provides a stable feeding device for the center of a vertical mill, which has the following beneficial effects: This vertical mill center-stabilized feeding device, through the coordinated arrangement of the grinding disc and the spiral stabilizing cone, effectively prevents material from sliding directly to the edge of the grinding disc during operation. Instead, the conical surface of the spiral stabilizing cone forces the material to slowly diffuse along the conical surface, avoiding the localized accumulation caused by concentrated material impact at a single point on the grinding disc in traditional feeding methods. Simultaneously, the threaded grooves on the outer surface of the spiral stabilizing cone further enhance the material distribution and guiding function. On one hand, the threaded grooves evenly distribute the concentrated falling material along the spiral trajectory to different radial areas of the grinding disc, completely breaking the limitation of material concentration in the center or a localized area in traditional feeding, achieving uniform material distribution in space. On the other hand, the spiral structure of the threaded grooves significantly slows down the material's descent speed. This design allows materials to move towards the edge of the grinding disc at a stable rate, preventing sudden changes in the thickness of the material layer on the grinding disc due to excessively rapid material descent. This effectively suppresses material layer fluctuations, significantly improves material distribution stability, and ensures that materials are evenly distributed on the grinding disc surface, laying the foundation for a stable material layer formation. It also avoids the problem of traditional materials being directly unloaded onto the grinding disc, resulting in poor material dispersion, unstable mill material layer, high vibration values, and a tendency for the fixing bolts of the inner baffle ring of the vertical mill to break. At the same time, the central feed pipe is the material conveying channel into the vertical mill. One end of it connects to the external first feed pipe to receive incoming materials, and the other end is aligned with the spiral stabilizing cone, ensuring that the material is accurately conveyed to the center area of ​​the grinding disc, avoiding uneven material distribution caused by material deviating from the grinding disc. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the spiral material stabilizing cone structure of this utility model.

[0014] In the diagram: 1. Vertical mill; 2. Slag discharge elevator; 3. Central feed pipe; 4. Grinding disc; 5. Spiral material stabilizing cone; 6. Threaded groove; 7. First feed pipe; 8. Coarse material outlet pipe; 9. Airlock valve; 10. First belt conveyor; 11. Second belt conveyor; 12. Grinding roller. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0016] Example 1: Please refer to Figure 1 and Figure 2This utility model provides a technical solution: a vertical mill center stabilizing feeding device, including a vertical mill 1 and a slag discharge elevator 2. The inner wall of the vertical mill 1 is detachably connected to a center feeding pipe 3. The inside of the vertical mill 1 is rotatably connected to a grinding disc 4. A spiral stabilizing cone 5 is welded to the upper end of the grinding disc 4. The height of the spiral stabilizing cone 5 is 500mm. The distance between the upper end of the spiral stabilizing cone 5 and the lower surface of the center feeding pipe 3 is 285mm-300mm. The upper end of the spiral stabilizing cone 5 and the lower surface of the center feeding pipe 3 correspond to each other. A threaded groove 6 is fixedly connected to the outer surface of the spiral stabilizing cone 5. The threaded groove 6 extends spirally downward along the outer surface of the spiral stabilizing cone 5. The width of the threaded groove 6 gradually increases from top to bottom along the axial direction of the spiral stabilizing cone 5. The width varies from 80mm to 150mm. One end of the center feeding pipe 3 passes through a flange on one side of the vertical mill 1 and is connected to a first feed pipe 7. Through the above technical solution, the height of the spiral stabilizing cone 5 is 500mm. This height matches the diameter of the grinding disc 4 in a conventional vertical mill. This ensures that the material falling from the central feed pipe 3 is effectively received by the cone surface, preventing the material from sliding directly over the cone surface to the edge of the grinding disc. It also prevents material accumulation at the cone apex due to excessive cone height. Simultaneously, it provides a sufficiently long guiding path for the threaded groove 6, ensuring thorough material dispersion. Furthermore, the distance between the upper end of the spiral stabilizing cone 5 and the lower surface of the central feed pipe 3 is 285mm-300mm. This range is the optimal range for smooth material fall and dispersion guidance. In actual use, the distance between the spiral stabilizing cone 5 and the central feed pipe 3 can be adjusted according to the actual situation to achieve a suitable height. During use, if... If the spacing is less than 285mm, the material is likely to get stuck between the opening of the central feed pipe 3 and the top of the cone. If the spacing is greater than 300mm, the material is likely to deviate from the cone surface when falling and cannot be effectively guided by the threaded groove 6. The upper end of the threaded groove 6 is 80mm wide near the central feed pipe 3, which can receive a small batch of material falling in a concentrated manner and prevent the material from overflowing out of the groove. As the material spreads along the cone surface, the groove width gradually increases to 150mm, which can accommodate more dispersed material and guide the material to be evenly distributed to the edge of the grinding disc 4 to prevent the material from accumulating in the groove. The gradual change in groove width ensures that the material flow speed is stable and avoids material layer fluctuations caused by sudden changes in groove width. The grinding disc 4 drives the material to move centrifugally by rotating, and also provides a fixed foundation for the spiral material stabilizing cone 5.

[0017] Example 2: Please refer to Figure 1This utility model provides a technical solution based on embodiment one. The lower end of the vertical mill 1 is detachably connected to a coarse material outlet pipe 8. The outer surface of the coarse material outlet pipe 8 is detachably connected to an air lock valve 9. The air lock valve 9 is a pneumatic air lock valve or an electric air lock valve. The other end of the coarse material outlet pipe 8 is provided with a first belt conveyor 10. The other end of the first belt conveyor 10 is correspondingly set to the input end of the slag discharge elevator 2. The output end of the slag discharge elevator 2 is provided with a second belt conveyor 11. One end of the second belt conveyor 11 is correspondingly set to the other end of the first feed pipe 7. Grinding rollers 12 are symmetrically arranged on the upper end of the grinding disc 4. The outer surface of the grinding rollers 12 is in contact with the upper surface of the grinding disc 4. The number of grinding rollers 12 is 2-4, and the grinding rollers 12 are arranged in a ring array along the axis of the grinding disc 4. Through the above technical solution, the coarse material outlet pipe 8 serves as a discharge channel for coarse material that has not reached the required fineness inside the vertical mill 1. It guides the coarse material from the lower end of the vertical mill 1 to the first belt conveyor 10, preventing coarse material from accumulating inside the mill and affecting normal grinding. The detachable connection facilitates cleaning of clogged coarse material or replacing worn pipes. The airlock valve 9, installed on the coarse material outlet pipe 8, functions primarily to prevent air leakage and control material discharge. During use, it blocks airflow exchange between the inside and outside of the vertical mill 1, preventing the negative pressure inside the mill 1 from being disrupted by air leakage. Simultaneously, it controls the coarse material discharge speed, preventing a large amount of coarse material from being discharged instantaneously. When the first conveyor belt 10 is overloaded, in actual use, a suitable airlock valve 9 can be selected based on the automation level of the production line and maintenance costs. Pneumatic airlock valves have a fast response speed and are suitable for scenarios requiring high discharge speed and frequent adjustments, while electric airlock valves offer high control precision and a low failure rate, making them suitable for long-term stable operation without frequent opening and closing. Both options can meet the core requirements for airlocking and discharge control. The first conveyor belt 10 can then perform the function of coarse material transfer, conveying the coarse material discharged from the coarse material outlet pipe 8 to the input end of the slag discharge elevator 2, forming the first stage of the coarse material circulation conveyor chain and ensuring a stable entry of coarse material into the slag discharge elevator 2. Inside the machine, the inefficiency and material waste of manual transfer are avoided. The slag discharge elevator 2 can lift and convey the coarse material to the second belt conveyor 11. The second belt conveyor 11 is the second conveying link connecting the slag discharge elevator 2 and the first feed pipe 7. It transfers the coarse material conveyed by the slag discharge elevator 2 to the first feed pipe 7, and finally returns it to the central discharge pipe 3 for re-grinding, completing the closed-loop process of coarse material, lifting, return, and re-grinding. This maximizes the raw material grinding qualification rate and reduces raw material loss. At the same time, the second belt conveyor 11 can also convey the coarse material to be ground from the outside to the inside of the first feed pipe 7. The second belt conveyor 11 can both... The external coarse material to be ground is conveyed, and the coarse slag discharged from the inside of the vertical mill 1 is also conveyed, so that it re-enters the inside of the vertical mill 1 for grinding again. After the coarse material enters the grinding disc 4 inside the vertical mill 1, the grinding roller 12 works with the grinding disc 4 to achieve extrusion grinding. Through its own weight and the hydraulic loading force inside the vertical mill 1, it applies pressure to the material on the grinding disc 4, crushing and grinding the blocky raw material to the target fineness. The design of 2-4 rollers arranged in a ring array along the axis of the grinding disc ensures that the grinding roller 12 applies uniform pressure to the material on the grinding disc 4, avoiding uneven grinding of the material layer and vibration of the vertical mill 1 caused by uneven distribution of the grinding roller 12.

[0018] All electrical components mentioned in this article are connected to an external main controller and 220V AC mains power via standard interfaces. The main controller can be any commercially available known device. There are no special restrictions on the specific models of the electrical components; any commercially available ordinary products can be selected, as long as they meet the usage requirements of this utility model.

[0019] In this invention, the working steps of the device are as follows: First, the vertical mill 1 is started. The raw material to be ground is conveyed to the inside of the first feed pipe 7 through the second belt conveyor 11. The first feed pipe 7 is connected to the central feed pipe 3 through a flange seal. The material falls vertically along the central feed pipe 3 and finally falls precisely onto the top of the spiral stabilizing cone 5 at the top of the grinding disc 4. The conical structure of the spiral stabilizing cone 5 prevents the material from sliding directly down and guides the material to slowly diffuse along the conical surface. The grinding disc 4 rotates at a uniform speed under the drive of the drive device inside the vertical mill 1, causing the material to move towards the edge with centrifugal force. Under the action of hydraulic loading force, the grinding roller 12 interacts with the grinding disc 4. The surface material is fully adhered, and the blocky raw material is crushed and ground to the target fineness through squeezing and crushing actions. At the same time, the coarse material that does not reach the fineness after grinding is discharged through the coarse material outlet pipe 8. The first belt conveyor 10 receives the coarse material discharged from the coarse material outlet pipe 8 and transfers it to the input end of the slag discharge elevator 2. The slag discharge elevator 2 vertically lifts the coarse material to the output end and transfers it to the second belt conveyor 11. The second belt conveyor 11 transports the coarse material and the newly added raw material to be ground together to the first feed pipe 7, and finally returns it to the top of the grinding disc 4 through the central discharge pipe 3 to participate in the grinding again.

[0020] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vertical mill center-stabilized feeding device, comprising a vertical mill (1) and a slag discharge elevator (2), characterized in that: The inner wall of the vertical mill (1) is detachably connected to a central feed pipe (3). The interior of the vertical mill (1) is rotatably connected to a grinding disc (4). The upper end of the grinding disc (4) is welded with a spiral material stabilizing cone (5), and the upper end of the spiral material stabilizing cone (5) corresponds to the lower surface of the central feed pipe (3). The outer surface of the spiral material stabilizing cone (5) is fixedly connected with a threaded groove (6). One end of the central feed pipe (3) passes through a flange on one side of the vertical mill (1) and is connected to a first feed pipe (7).

2. The vertical mill center-stabilized feeding device according to claim 1, characterized in that: The lower end of the vertical mill (1) is detachably connected to a coarse material outlet pipe (8), and the outer surface of the coarse material outlet pipe (8) is detachably connected to an airlock valve (9). The other end of the coarse material outlet pipe (8) is provided with a first belt conveyor (10), and the other end of the first belt conveyor (10) is correspondingly provided with the input end of the slag discharge elevator (2).

3. The vertical mill center-stabilized feeding device according to claim 1, characterized in that: The output end of the slag discharge elevator (2) is provided with a second belt conveyor (11), and one end of the second belt conveyor (11) is correspondingly set with the other end of the first feed pipe (7).

4. The vertical mill center-stabilized feeding device according to claim 1, characterized in that: The upper end of the grinding disc (4) is symmetrically provided with grinding rollers (12). The outer surface of the grinding rollers (12) is in contact with the upper surface of the grinding disc (4). There are 2-4 grinding rollers (12), and the grinding rollers (12) are arranged in a ring array along the axis of the grinding disc (4).

5. The vertical mill center-stabilized feeding device according to claim 1, characterized in that: The height of the spiral material stabilizing cone (5) is 500mm, and the distance between the upper end of the spiral material stabilizing cone (5) and the lower surface of the central feed tube (3) is 285mm-300mm.

6. The vertical mill center-stabilized feeding device according to claim 1, characterized in that: The threaded groove (6) extends spirally downward along the outer surface of the spiral material stabilizing cone (5), and the width of the threaded groove (6) gradually increases from top to bottom along the axial direction of the spiral material stabilizing cone (5), with the groove width varying from 80mm to 150mm.

7. The vertical mill center-stabilized feeding device according to claim 2, characterized in that: The airlock valve (9) is a pneumatic airlock valve or an electric airlock valve.

Images