Pulverized coal separating device for steel ball coal mill

Abstract

The utility model provides a pulverized coal separating device for a steel ball coal mill, and relates to the technical field of boiler pulverizing systems of thermal power plants, the pulverized coal separating device comprises a shell and a rotary drum, the inner side of the shell is provided with an annular groove, the shell is rotatably connected with a rotary ring through the annular groove, the inner side of the rotary ring is fixedly connected with a plurality of sliding blocks in the circumferential direction, and the sliding blocks are connected with the rotary drum. A plurality of sliding grooves in sliding connection with the sliding blocks are formed in the outer side of the rotating cylinder in the circumferential direction, an inner ring plate is fixedly connected to the inner side of the shell, the gear ring drives the rotating cylinder to rotate, the rolling wheels roll on the inner ring plate and the top faces of the wedge blocks to enable the rotating cylinder to vibrate, meanwhile, the rotating ring and the rotating cylinder are in sliding connection through the sliding blocks and the sliding grooves, and axial moving space is reserved. The motor drives the gear to rotate through the sliding sleeve and the sliding column, it is guaranteed that axial movement of the rotary drum does not affect power transmission, the overall structure is relatively simple, and the troubleshooting and maintenance difficulty is lowered.

Description

Technical Field

[0001] This utility model relates to the technical field of boiler pulverizing systems in thermal power plants, and in particular to a pulverized coal separation device for a ball mill. Background Technology

[0002] The ball mill is one of the main auxiliary machines in thermal power plants. It consists of a drive motor, reducer, large and small gears, rotary conveyor, cylinder, hot air box, etc., and is the main equipment of the pulverized coal preparation system for boiler combustion.

[0003] An existing coal powder separation device for a ball mill, publication number CN218190006U, describes a process where coal powder enters the crushing mechanism from the feed pipe during operation. A control component drives the crushing mechanism to rotate, and the steel balls inside the crushing mechanism crush the coal powder. The control component also drives the air guiding component, which allows airflow to disperse the coal powder adhering to the steel balls. The air guiding component can also drive the crushing mechanism to vibrate up and down via a connecting component, using vibration to separate the coal powder from the inside of the crushing mechanism. By setting up the connecting component, the support rod drives the fan to rotate while simultaneously driving the connecting rod to rotate via a driven component and a transmission component. The incomplete gear and rack engagement enables the vibration of the crushing mechanism, which in turn works with the air guiding component to complete the separation of coal powder.

[0004] However, this device contains many complex components such as a drive mechanism, control components, and air guiding components. The connections between these components are complicated. For example, the control components, such as the movable plate, telescopic parts, and drive components, work together. If any part fails, it may affect the overall operation, and troubleshooting and maintenance are quite difficult. Utility Model Content

[0005] The purpose of this utility model is to solve the problems existing in the prior art and to propose a coal powder separation device for a ball mill.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a coal powder separation device for a ball mill, comprising a shell and a rotating drum. An annular groove is provided on the inner side of the shell, and a rotating ring is rotatably connected to the shell through the annular groove. Multiple sliders are fixedly connected to the inner circumferential side of the rotating ring. Multiple sliding grooves are provided on the outer circumferential side of the rotating drum to slide and connect with the sliders. An inner ring plate is fixedly connected to the inner side of the shell. Multiple wedges arranged in a circular array are fixedly connected to the top surface of the inner ring plate. Rollers for rolling on the top surface of the inner ring plate and wedges are rotatably connected to the outer side of the rotating drum. A toothed ring is fixedly connected to the top of the rotating drum. A gear is provided above the rotating drum, and the gear meshes with the toothed ring.

[0007] Preferably, a sliding column is fixedly connected to the top of the gear, a motor is fixedly connected to the inner side of the housing, and a sliding sleeve that slides into the sliding column is fixedly connected to the main shaft of the motor.

[0008] Preferably, two filter plates are fixed from top to bottom on the inner side of the rotating drum, with the upper filter plate being a coarse filter plate and the lower filter plate being a fine filter plate.

[0009] Preferably, a coarse material inlet is provided on the side wall of the rotating drum between the two filter plates, and multiple coarse material inlets are provided in a ring array. A fine material inlet is provided at the bottom of the shell, directly below the fine filter plate.

[0010] Preferably, the rotating drum has two bellows arranged opposite each other.

[0011] Preferably, a connecting plate is rotatably connected to the bottom of the gear, and the connecting plate is rotatably mounted to the gear ring.

[0012] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0013] 1. In this utility model, the gear ring drives the rotating drum to rotate, and the roller rolls on the inner ring plate and the top surface of the wedge block to make the rotating drum vibrate. At the same time, the rotating ring and the rotating drum are slidably connected through the slider and the slide groove, leaving space for axial movement. The motor drives the gear to rotate through the sliding sleeve and the sliding column to ensure that the axial movement of the rotating drum does not affect the power transmission. The overall structure is relatively simple, and the difficulty of fault diagnosis and maintenance is reduced.

[0014] 2. In this utility model, the coarse filter plate can perform preliminary filtration, preventing the steel balls from passing through. At the same time, under the rotation and vibration of the rotating drum, the coal powder on the steel balls is promoted to fall off and pass through the coarse filter plate. The fine filter plate further screens the coal powder, filtering out the fine qualified coal powder and discharging it from the fine material outlet, while the unqualified coal powder is discharged from the coarse material outlet, thus achieving efficient and precise coal powder separation and improving the quality of coal powder. Attached Figure Description

[0015] Figure 1 This utility model provides a three-dimensional structural schematic diagram of a coal powder separation device for a ball mill.

[0016] Figure 2 In this utility model Figure 1 A side-section three-dimensional structural diagram;

[0017] Figure 3 This is a three-dimensional structural diagram of the rotating ring in this utility model;

[0018] Figure 4 This is a three-dimensional structural diagram of the wedge block in this utility model.

[0019] Legend: 1. Shell; 2. Rotary drum; 3. Motor; 4. Sliding sleeve; 5. Sliding column; 6. Gear; 7. Air box; 8. Gear ring; 9. Ring groove; 10. Rotating ring; 11. Sliding groove; 12. Coarse filter plate; 13. Fine filter plate; 14. Roller; 15. Inner ring plate; 16. Sliding block; 17. Coarse material inlet; 18. Fine material inlet; 19. Wedge block; 20. Connecting plate. Detailed Implementation

[0020] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0022] like Figures 1-4 As shown, a coal powder separation device for a ball mill includes a housing 1 and a rotating drum 2. An annular groove 9 is provided on the inner side of the housing 1, and a rotating ring 10 is rotatably connected to the housing 1 through the annular groove 9. Multiple sliders 16 are fixedly connected to the inner circumferential side of the rotating ring 10. Multiple sliding grooves 11 are provided on the outer circumferential side of the rotating drum 2, which are slidably connected to the sliders 16. An inner ring plate 15 is fixedly connected to the inner side of the housing 1, and multiple wedges 19 arranged in a ring array are fixedly connected to the top surface of the inner ring plate 15. A roller 14 for rolling on the top surface of the inner ring plate 15 and the wedges 19 is rotatably connected to the outer side of the rotating drum 2. A toothed ring 8 is fixedly connected to the top of the rotating drum 2, and a gear 6 is provided above the rotating drum 2, which meshes with the toothed ring 8.

[0023] In this technical solution, the rotation of the toothed ring 8 will drive the rotating cylinder 2 to rotate around its own axis. When the rotating cylinder 2 rotates, the roller 14 on its outer side will roll on the top surface of the inner ring plate 15 and the wedge block 19. The roller 14 will pass over the top surface of the wedge block 19 and then climb upward. After that, it will fall downward under the action of gravity, causing the rotating cylinder 2 to vibrate while rotating. The rotating ring 10 is slidably connected to the sliding groove 11 on the outer side of the rotating cylinder 2 through the slider 16, which reserves space for the axial movement of the rotating cylinder 2.

[0024] like Figure 2 As shown, a sliding column 5 is fixedly connected to the top of the gear 6, a motor 3 is fixedly connected to the inside of the housing 1, and a sliding sleeve 4 that is slidably inserted into the main shaft of the motor 3 is fixedly connected to the main shaft of the motor 3.

[0025] In this technical solution, after the motor 3 starts, it drives the sliding column 5 to rotate through the sliding sleeve 4, which in turn drives the gear 6 to rotate. By setting the sliding sleeve 4 and the sliding column 5, space is reserved for the axial movement of the rotating drum 2.

[0026] like Figure 2 As shown, two filter plates are fixed from top to bottom on the inner side of the rotating cylinder 2. The upper filter plate is the coarse filter plate 12, and the lower filter plate is the fine filter plate 13. A coarse material inlet 17 is provided on the side wall of the rotating cylinder 2 between the two filter plates. Multiple coarse material inlets 17 are provided and distributed in a ring array. A fine material inlet 18 is provided at the bottom of the shell 1 and directly below the fine filter plate 13.

[0027] In this technical solution, when the rotating drum 2 rotates and vibrates under the drive of the motor 3, the coal powder conveyed from the ball mill will enter the rotating drum 2. The coarse filter plate 12 performs preliminary filtration of the coal powder. The steel balls cannot pass through the coarse filter plate 12. Under the action of the rotation and vibration of the rotating drum 2, the coal powder on the steel balls falls off the steel balls and passes through the coarse filter plate 12. By setting the fine filter plate 13, the coal powder is filtered again, and the fine coal powder that meets the requirements is screened out. The qualified fine coal powder will pass through the fine filter plate 13 and be discharged from the fine material port 18, while the unqualified coal powder will be discharged from the coarse material port 17 under the action of centrifugal force.

[0028] like Figure 2 As shown, two bellows 7 are arranged opposite each other inside the rotating drum 2.

[0029] In this technical solution, a wind box 7 is installed to assist in the separation of pulverized coal and steel balls.

[0030] like Figure 2 and Figure 3 As shown, a connecting plate 20 is rotatably connected to the bottom of gear 6, and the connecting plate 20 is rotatably mounted with the gear ring 8.

[0031] In this technical solution, by setting a connecting plate 20, the gear ring 8 and the gear 6 are always at the same height and in a meshing state when the rotating drum 2 vibrates.

[0032] Working principle: When the motor 3 starts, its main shaft drives the sliding sleeve 4 to rotate. The sliding sleeve 4 slides into the sliding column 5, which in turn drives the gear 6 to rotate. The gear 6 meshes with the gear ring 8. The rotation of the gear ring 8 drives the rotating drum 2 to rotate around its own axis. When the rotating drum 2 rotates, it drives the rotating ring 10 to rotate, and the roller 14 rolls on the top surface of the inner ring plate 15 and the wedge block 19. When the roller 14 passes the top surface of the wedge block 19, it climbs upward and then falls downward under the action of gravity. This causes the rotating drum 2 to move up and down along the sliding groove 11 while rotating, generating vibration.

[0033] The wiring diagrams of the motor 3 and the blower box 7 in this utility model are common knowledge in the field. Their working principle is a well-known technology. The appropriate model is selected according to the actual use. Therefore, the control method and wiring layout of the motor 3 and the blower box 7 will not be explained in detail.

[0034] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A pulverized coal separation device for a ball mill, comprising a shell (1) and a rotating drum (2), characterized in that: The inner side of the housing (1) is provided with an annular groove (9), and the housing (1) is rotatably connected to a rotating ring (10) through the annular groove (9). Multiple sliders (16) are fixedly connected to the inner circumference of the rotating ring (10). Multiple sliding grooves (11) are rotatably connected to the sliders (16) on the outer circumference of the rotating cylinder (2). An inner ring plate (15) is fixedly connected to the inner side of the housing (1). Multiple wedges (19) arranged in a ring array are fixedly connected to the top surface of the inner ring plate (15). Rollers (14) for rolling on the top surface of the inner ring plate (15) and the wedges (19) are rotatably connected to the outer side of the rotating cylinder (2). A toothed ring (8) is fixedly connected to the top of the rotating cylinder (2). A gear (6) is provided above the rotating cylinder (2). The gear (6) meshes with the toothed ring (8).

2. The pulverized coal separation device for a ball mill according to claim 1, characterized in that: The gear (6) is fixedly connected to a sliding column (5) at the top, and a motor (3) is fixedly connected to the inner side of the housing (1). The main shaft of the motor (3) is fixedly connected to a sliding sleeve (4) that slides into the sliding column (5).

3. The pulverized coal separation device for a ball mill according to claim 1, characterized in that: Two filter plates are fixed inside the rotating drum (2) from top to bottom. The filter plate at the top is the coarse filter plate (12), and the filter plate at the bottom is the fine filter plate (13).

4. The pulverized coal separation device for a ball mill according to claim 3, characterized in that: The rotating drum (2) has a coarse material inlet (17) on its side wall and between the two filter plates. There are multiple coarse material inlets (17) arranged in a ring array. The shell (1) has a fine material inlet (18) at its bottom and directly below the fine filter plate (13).

5. The pulverized coal separation device for a ball mill according to claim 1, characterized in that: The rotating drum (2) has two bellows (7) arranged opposite to each other inside.

6. The pulverized coal separation device for a ball mill according to claim 1, characterized in that: The bottom of the gear (6) is rotatably connected to a connecting plate (20), and the connecting plate (20) is rotatably mounted on the gear ring (8).

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