External circulation vertical mill with zero-wear discharge device

Abstract

The present application relates to vertical roller mill technical field, specifically to a kind of outer circulation vertical mill with zero wear discharge device, including vertical mill body, the outer side of mill disc assembly of vertical mill body is provided with synchronous rotary discharge device, and discharge device includes material baffle group, and material baffle group includes oppositely arranged inner side baffle and outer side baffle, and bottom plate is provided between inner side baffle and outer side baffle and is overturned to unload downwards, and inner side baffle, outer side baffle and bottom plate form U-shaped discharge groove structure;The outer side circumference of mill disc assembly is provided with several godets and godet supports the lower surface of bottom plate to keep shoe material groove structure closed, and the gap between godets at the discharge port of vertical mill is increased to make bottom plate overturn downwards to unload.Discharge device is synchronous with mill disc assembly and is rotated, and it can be guaranteed to unload cleanly when being rotated to discharge port and overturning by itself, not only improve the efficiency of operation, also guarantee the stability of device reliable, can reduce the wear of device, prolong the service life of device.

Description

Technical Field

[0001] This invention relates to the field of vertical roller mill technology, and more specifically to an external circulation vertical mill with a zero-wear unloading device. Background Technology

[0002] In recent years, various industries have put forward new requirements for energy conservation and emission reduction in industrial application technologies. To achieve these goals, the cement industry has been continuously promoting technological innovation and progress, earnestly responding to the national call. One specific implementation technology is the use of external circulation vertical mills to replace traditional vertical mills in raw material production. Although energy consumption is significantly reduced compared to traditional vertical mills, some fatal flaws exist, hindering its large-scale promotion and application.

[0003] To achieve energy conservation and consumption reduction, an external circulation vertical mill grinding process is adopted. The external circulation volume is generally 3-6 times the feed volume, and all these particulate materials need to be discharged through a discharge device. Currently, the structure and principle of the discharge device for an external circulation vertical mill are basically the same as those of a traditional vertical mill, consisting of an annular collecting trough on the mill casing and scrapers mounted on the grinding disc. (See...) Figure 1 During operation, material is thrown from the edge of the grinding disc and slides into the annular collecting trough. The scraper then drives the granular material along the trough until it is discharged from the slag outlet. The significant speed difference and intense compression between the granular material, the scraper, and the annular collecting trough lead to high wear and tear on the annular collecting trough and scraper. For some highly abrasive materials, the machine needs to be shut down almost weekly to replace or maintain the liners and scrapers, severely impacting the production line's operating rate.

[0004] It is evident that the current unloading device structure of the external circulation vertical mill still has room for improvement. Optimization is needed to develop a more durable and less wear-prone unloading device structure, thereby significantly extending its service life. Therefore, a more reasonable technical solution is required to address the technical problems existing in the current technology. Summary of the Invention

[0005] To overcome at least one of the defects mentioned above, this invention proposes an external circulation vertical mill with a zero-wear unloading device. By adjusting the structure of the unloading device, the relative movement between the material and the annular collection trough is maximized, the squeezing angle is reduced, and the problems of wear and short maintenance cycle of the unloading device are fundamentally solved.

[0006] To achieve the above-mentioned technical effects, the vertical mill disclosed in this invention can adopt the following technical solution:

[0007] An external circulation vertical mill with a zero-wear unloading device includes a mill body. A synchronously rotating unloading device is provided on the outside of the mill body's grinding disc assembly. The unloading device includes a baffle plate assembly, which includes an inner baffle and an outer baffle arranged opposite each other. A bottom plate for downward unloading is provided between the inner and outer baffles. The inner baffle, outer baffle, and bottom plate form a U-shaped unloading trough structure. Several rollers are provided on the outer circumferential surface of the grinding disc assembly. The rollers cooperate to support the lower surface of the bottom plate to keep the material trough structure closed. The gap between the rollers at the unloading port of the vertical mill is increased to allow the bottom plate to flip downward for unloading.

[0008] The aforementioned external circulation vertical mill improves the structure of the unloading device by setting it to a falling unloading type, avoiding the need for scraping structures such as scrapers. This prevents friction and squeezing between the material and the scraper structure, thus avoiding wear and tear on the unloading device. This effectively ensures the structural stability and reliability of the unloading device and significantly improves its service life.

[0009] Furthermore, the base plate can be flipped in various ways, and is not limited to a single method. Here, we optimize and propose one feasible option: a pivot pin is provided between the inner and outer baffles, connecting the base plate to allow it to flip vertically. In this solution, the pivot pin connects to the end of the base plate, causing the entire base plate to flip in one direction. In some solutions, a protrusion of a certain height can also be provided at the end of the base plate, forming an L-shaped structure, which can be deflected and limited during downward flipping.

[0010] Furthermore, the idler rollers are used to support the base plate and keep it level. Their arrangement can take various forms and is not limited to a single method. Here, we optimize the arrangement and propose one feasible option: the idler rollers are arranged at intervals along the circumference. At the circumferential segment corresponding to the grinding disc assembly and the discharge port, the spacing between the idler rollers is greater than the length of the base plate; on the remaining circumferential segments, the spacing between the idler rollers is less than the length of the base plate. With this arrangement, the idler rollers can use flexible roller surfaces to support the base plate and reduce wear.

[0011] Furthermore, after the bottom plate flips and unloads at the discharge port, it continues to rotate and deflect back to a horizontal position. This can be achieved in various ways and is not limited to a single method. Here, we optimize the process and propose one feasible option: a guide roller is installed on the circumferential segment corresponding to the discharge port. The height of the guide roller is lower than that of the idler roller and is used to guide the flipped and drooping bottom plate to deflect back to a horizontal position. When this scheme is adopted, the circumferential gap between the guide roller and the adjacent idler roller is less than the length of the bottom plate.

[0012] Furthermore, to maintain the stability of the inner and outer baffles, an optimization is proposed, and one feasible option is suggested: several fixing connectors are provided between the inner and outer baffles, and these fixing connectors are tightened to connect the inner and outer baffles. When using this solution, the fixing connectors can be connecting rods, with one end connected to the inner baffle and the other end connected to the outer baffle.

[0013] Furthermore, when connecting and fixing the unloading device, the inner baffle can be connected to the grinding disc assembly. The specific method is not limited to one method; here, an optimization is proposed, and one feasible option is suggested: the inner baffle is connected to the grinding disc assembly, and a material-blocking structure is provided between the top of the inner baffle and the grinding disc. When this solution is adopted, the material-blocking structure includes a material-blocking ring.

[0014] Furthermore, the unloading device is applied to the vertical mill. The structure of the vertical mill can be constructed in various forms and is not limited to one. Here, we optimize and propose one feasible option: the vertical mill body includes a grinding disc assembly, which is driven to rotate by a drive device. A grinding roller assembly is installed on the grinding disc assembly, and the grinding roller assembly works with the rocker arm assembly to achieve lifting and adjustment. The rocker arm assembly is driven by a hydraulic system to drive the column assembly. The vertical mill body also includes a mill housing. When this scheme is adopted, the mill housing serves as an external cover, covering and shielding other components.

[0015] Compared with the prior art, some of the beneficial effects of the technical solution disclosed in this invention include:

[0016] The unloading device rotates synchronously with the grinding disc assembly. When it rotates to the unloading port, it flips over to unload the material without the need for scraping. This ensures clean unloading, thus improving operational efficiency, ensuring the stability and reliability of the device, reducing wear, and extending its service life. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of a vertical mill in the prior art.

[0019] Figure 2 This is a schematic diagram of the overall structure of the vertical mill in this invention.

[0020] Figure 3 This is a schematic diagram of the unloading device in this invention.

[0021] Figure 4 This is a cross-sectional schematic diagram of the unloading device in this invention.

[0022] Figure 5 This is a schematic diagram of the overall structure of the unloading device in this invention.

[0023] Figure 6 This is a schematic diagram showing the flow of materials within the unloading device of the present invention.

[0024] In the above attached figures, the meanings of each number are as follows:

[0025] 1. Grinding roller assembly; 2. Rocker arm assembly; 3. Grinding disc assembly; 4. Mill housing; 5. Column assembly; 6. Drive unit; 7. Hydraulic system; 8. Unloading device; 9. Baffle plate assembly; 10. Base plate; 11. Rotary pin; 12. Idler roller; 13. Baffle ring. Detailed Implementation

[0026] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0027] To address the issues of easy wear and short service life of the unloading device in existing external circulation vertical mills, the following embodiments are optimized to overcome the defects in the prior art.

[0028] Example

[0029] like Figures 1-6 As shown, this embodiment provides an external circulation vertical mill with a zero-wear unloading device 8, including a vertical mill body. The mill body has a mill disc assembly 3 with a synchronously rotating unloading device 8 on its outer side. The unloading device 8 includes a baffle plate group 9, which includes an inner baffle and an outer baffle arranged opposite to each other. A bottom plate 10 for downward unloading is provided between the inner baffle and the outer baffle. The inner baffle, the outer baffle, and the bottom plate 10 form a U-shaped unloading trough structure. A number of rollers 12 are provided on the outer circumferential surface of the mill disc assembly 3. The rollers 12 cooperate to support the lower surface of the bottom plate 10 to keep the shoe material trough structure closed. The gap between the rollers 12 at the unloading port of the vertical mill is increased to allow the bottom plate 10 to flip downward for unloading.

[0030] The external circulation vertical mill disclosed in this embodiment improves the structure of the unloading device 8 by setting it to a falling unloading type, avoiding the use of scrapers or other structures for scraping. This prevents friction and squeezing between the material and the scraper structure, thus avoiding wear and tear on the unloading device 8. This effectively ensures the structural stability and reliability of the unloading device 8 and effectively improves its service life.

[0031] The base plate 10 can be flipped in various ways, and is not limited to a single method. This embodiment optimizes and adopts one feasible option: a rotating pin 11 is provided between the inner baffle and the outer baffle, and the rotating pin 11 connects to the base plate 10 to make the base plate 10 flip in the vertical direction. In this scheme, the rotating pin 11 is connected to the end of the base plate 10, so that the entire base plate 10 flips in one direction; in some schemes, the end of the base plate 10 can also be provided with a certain height of protrusion, so that the base plate 10 forms an L-shaped structure, which can be deflected and limited during the downward flipping process.

[0032] The idler rollers 12 are used to support the base plate 10 and keep it level. Their arrangement can take various forms and is not limited to a single method. This embodiment optimizes the arrangement and adopts one feasible option: the idler rollers 12 are arranged at intervals along the circumference. The spacing between the idler rollers 12 at the circumferential segment corresponding to the grinding disc assembly 3 and the discharge port is greater than the length of the base plate 10, while the spacing between the idler rollers 12 at the remaining circumferential segments is less than the length of the base plate 10. With this arrangement, the idler rollers 12 can have flexible roller surfaces, supporting the base plate 10 and reducing wear.

[0033] After the bottom plate 10 flips over to unload material at the discharge port, it continues to rotate and then deflects back to a horizontal position. This can be achieved in various ways and is not limited to one method. This embodiment optimizes the process and adopts one feasible option: a guide roller is provided on the circumferential segment corresponding to the discharge port. The height of the guide roller is lower than that of the support roller 12, and it is used to guide the flipped and drooping bottom plate 10 to deflect back to a horizontal position. When this solution is adopted, the circumferential gap between the guide roller and the adjacent support roller 12 is less than the length of the bottom plate 10.

[0034] To maintain the stability of the inner and outer baffles, an optimization is proposed, and one feasible option is suggested: several fixing connectors are provided between the inner and outer baffles, and these connectors are tightened to connect the inner and outer baffles. In this scheme, the fixing connectors can be connecting rods, with one end connected to the inner baffle and the other end connected to the outer baffle.

[0035] When connecting and fixing the unloading device 8, the inner baffle can be connected to the grinding disc assembly 3. The specific method is not limited to one particular method; this embodiment optimizes the connection and adopts one feasible option: the inner baffle is connected and fitted to the grinding disc assembly 3, and a material-blocking structure is provided between the top of the inner baffle and the grinding disc. When this solution is adopted, the material-blocking structure includes a material-blocking ring 13, which seals the gap between the inner baffle and the grinding disc, thereby preventing material leakage.

[0036] The unloading device 8 is applied to a vertical mill. The structure of a vertical mill can be constructed in various forms and is not limited to a single one. This embodiment optimizes and adopts one feasible option: the vertical mill body includes a grinding disc assembly 3, which is driven to rotate by a drive device 6. A grinding roller assembly 1 is provided on the grinding disc assembly 3, and the grinding roller assembly 1 cooperates with the rocker arm assembly 2 to achieve lifting and adjustment. The rocker arm assembly 2 is driven by a hydraulic system 7 to drive the column assembly 5. The vertical mill body also includes a mill housing 4. When this scheme is adopted, the mill housing 4 serves as an external cover to cover and shield other components.

[0037] The above are the embodiments listed in this example. However, this example is not limited to the optional embodiments described above. Those skilled in the art can arbitrarily combine the above methods to obtain other various embodiments. Anyone can derive other various forms of embodiments under the guidance of this example. The above specific embodiments should not be construed as limiting the scope of protection of this example. The scope of protection of this example should be defined in the claims.

Claims

1. An external circulation vertical mill with a zero-wear unloading device, comprising a mill body, wherein the mill body includes a grinding disc assembly (3), and a synchronously rotating unloading device (8) is provided on the outside of the grinding disc assembly (3), characterized in that: The unloading device (8) includes a baffle plate group (9), which includes an inner baffle and an outer baffle arranged opposite to each other. A bottom plate (10) for downward unloading is provided between the inner baffle and the outer baffle. The inner baffle, the outer baffle and the bottom plate (10) form a U-shaped unloading trough structure. Several rollers (12) are provided on the outer circumferential surface of the grinding disc assembly (3). The rollers (12) cooperate to support the lower surface of the bottom plate (10) to keep the unloading trough structure closed. The gap between the rollers (12) at the unloading port of the vertical mill is increased so that the bottom plate (10) can be flipped downward for unloading.

2. The external circulation vertical mill with zero-wear unloading device according to claim 1, characterized in that: A pivot pin (11) is provided between the inner baffle and the outer baffle. The pivot pin (11) is connected to the bottom plate (10) so that the bottom plate (10) can be flipped in the vertical direction.

3. The external circulation vertical mill with zero-wear unloading device according to claim 1, characterized in that: The rollers (12) are arranged at intervals along the circumference. The distance between the rollers (12) on the circumference section corresponding to the discharge port of the grinding disc assembly (3) is greater than the length of the base plate (10). The distance between the rollers (12) on the other circumference sections is less than the length of the base plate (10).

4. The external circulation vertical mill with zero-wear unloading device according to claim 1 or 3, characterized in that: A guide roller is provided on the circumferential section corresponding to the discharge port. The height of the guide roller is lower than that of the idler roller (12) and is used to guide the tilted and drooping bottom plate (10) to deflect to the horizontal.

5. The external circulation vertical mill with zero-wear unloading device according to claim 1, characterized in that: Several fixing connectors are provided between the inner baffle and the outer baffle. The fixing connectors are tightened and connect the inner baffle and the outer baffle.

6. The external circulation vertical mill with zero-wear unloading device according to claim 5, characterized in that: The fixed connector includes a connecting rod.

7. The external circulation vertical mill with zero-wear unloading device according to claim 1, characterized in that: The inner baffle is connected to the grinding disc assembly (3), and a material blocking structure is provided between the top of the inner baffle and the grinding disc.

8. The external circulation vertical mill with zero-wear unloading device according to claim 7, characterized in that: The material-blocking structure includes a material-blocking ring (13).

9. The external circulation vertical mill with zero-wear unloading device according to claim 1, characterized in that: The grinding disc assembly (3) is driven to rotate by the drive device (6). The grinding disc assembly (3) is equipped with a grinding roller assembly (1), and the grinding roller assembly (1) works with the rocker arm assembly (2) to achieve lifting and adjustment. The rocker arm assembly (2) is driven by the hydraulic system (7) to drive the column assembly (5). The vertical mill body also includes the mill housing (4).

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