A ball loading device for a double in double out coal mill

Abstract

The application relates to the technical field of coal mills, in particular to a steel ball adding device suitable for a double-inlet and double-outlet coal mill, which comprises a speed reduction channel, a high-pressure air pipe and a feeding channel, the high-pressure air pipe and the feeding channel are communicated with the top of the speed reduction channel, a material guide channel arranged vertically is arranged in the speed reduction channel, a spiral material guide cavity is arranged on the material guide channel, the top opening of the material guide cavity is located directly below the feeding channel, a plurality of friction units for the steel balls to abut against during rolling are arranged in the material guide cavity, high-pressure airflow blown by the high-pressure air pipe passes through the inner side of the material guide channel, and the material guide channel is used for separating the steel balls from the high-pressure airflow blown by the high-pressure air pipe. The application has the beneficial effect that multistage speed reduction of the steel balls is realized, the falling speed of the steel balls is reduced, and the service life of the machine is improved.

Description

Technical Field

[0001] This application relates to the technical field of coal mills, and specifically to a steel ball feeding device suitable for a double-inlet double-outlet coal mill. Background Technology

[0002] The double-inlet, double-outlet ball mill is a new type of pulverizing equipment developed from the single-inlet, single-outlet ball mill. It overcomes the shortcomings of the single-inlet, single-outlet ball mill, such as its limited functionality and inability to be used for direct coal blowing. It integrates drying, grinding, classifying, and conveying functions, featuring simple system layout, high automation, wide adaptability to various coal types, high coal powder fineness, and easy maintenance and operation, meeting the requirements of modern large-scale power plants.

[0003] A search revealed Chinese Patent Publication No. CN219441917U, which discloses an auxiliary device for adding steel balls to a coal mill, relating to the technical field of coal mill equipment. The device includes a ball-filling sleeve through which compressed air is supplied to form a ball-filling channel; a cover with several first through holes along its circumference to form a sealed cavity with the ball-filling sleeve; and symmetrically arranged arc-shaped grooves in the center for placing steel balls. A rotating assembly includes a movably connected connecting rod and an arc-shaped plate. The connecting rod is rotatably connected to the cover, and the arc-shaped plate is arranged corresponding to the arc-shaped grooves for opening when adding steel balls and closing when sealing. This invention is suitable for adding steel balls during coal mill operation, avoiding the need for disassembling and installing the cover. Steel balls can be directly added by rotating the connecting rod, saving time, reducing labor intensity, and improving the efficiency of adding steel balls to the coal mill.

[0004] The aforementioned technologies have the following drawbacks: Although the steel ball guide plate changes the direction of the steel ball's movement, thus slowing down its descent, the steel ball's descent speed gradually increases during subsequent free fall. Furthermore, the high-pressure airflow ejected from the air supply sleeve will also accelerate the steel ball's descent as it flows downwards. Excessive descent speed of the steel ball will damage the equipment and affect the machine's service life, thus requiring improvement. Summary of the Invention

[0005] To address the aforementioned issues, this application provides a steel ball feeding device suitable for a double-inlet, double-outlet coal mill. This device achieves multi-stage deceleration of the steel balls, reducing their falling speed and thus improving the machine's service life.

[0006] To achieve the above objectives, the embodiments of this application specifically adopt the following technical solution: a steel ball feeding device suitable for a double-inlet double-outlet coal mill, comprising a deceleration channel, a high-pressure air pipe, and a feeding channel. The high-pressure air pipe and the feeding channel are connected to the top of the deceleration channel. A vertically arranged guide channel is installed inside the deceleration channel. A spiral guide cavity is provided on the guide channel. The top opening of the guide cavity is located directly below the feeding channel. Several friction units are provided inside the guide cavity for the steel balls to abut against each other during rolling. The high-pressure airflow blown out by the high-pressure air pipe passes through the inside of the guide channel. The guide channel is used to separate the steel balls from the high-pressure airflow blown out by the high-pressure air pipe.

[0007] Optionally, the friction unit includes a deceleration plate located in the material guiding cavity. One end of the deceleration plate is rotatably connected to the material guiding channel and is connected to the same torsion spring as the material guiding channel. The other end of the deceleration plate and one side wall of the material guiding cavity together form a lower deceleration cavity.

[0008] When the torsion spring is in its natural state, the width of the lower deceleration chamber is smaller than the diameter of the steel ball. When the steel ball passes through the lower deceleration chamber, it will push the deceleration plate to flip, thus increasing the width of the lower deceleration chamber.

[0009] Optionally, the friction unit includes an air guide pipe installed on the material guide channel. One end of the air guide pipe is located on the trajectory of the high-pressure airflow blown out by the high-pressure air pipe, and the other end of the air guide pipe is open towards the material guide cavity. The angle between the direction of the high-pressure airflow blown out by the end of the air guide pipe and the direction of the steel ball when passing through the lower deceleration cavity is an obtuse angle.

[0010] Optionally, the deceleration plate is provided with an air jet, and the end of the air guide pipe facing the feed chamber is set in a constricted shape and connected to the air jet. The end of the air guide pipe is a flexible hose. When the high-pressure airflow enters the air jet, it will push the deceleration plate to flip, thereby reducing the width of the lower deceleration chamber.

[0011] Optionally, the friction unit includes a rocker plate located in the lower deceleration chamber, the middle part of which is rotatably connected to the material guide chamber via a horizontal shaft;

[0012] When the rocker is not under load, one end of the rocker will be higher than the bottom wall of the guide cavity, and the other end of the rocker will be lower than the bottom wall of the guide cavity. The steel balls in the guide cavity will pass through the high and low ends of the rocker in sequence.

[0013] Optionally, the friction unit further includes a windmill and a cam. The windmill is located inside the air duct and is rotatably connected to the air duct via a first rotating shaft. The cam is located outside the air duct and is rotatably connected to the air duct via a second rotating shaft. The first rotating shaft is connected to the second rotating shaft via a belt drive.

[0014] When the high-pressure airflow passes through the air duct, it will drive the windmill to rotate. The windmill will drive the second shaft and the cam to rotate through the first shaft. During the rotation, the cam will intermittently push the high end of the rocker to flip downward.

[0015] Optionally, once the steel ball reaches the high end of the rocker, the cam will push the high end of the rocker downwards until the steel ball reaches the other end of the rocker.

[0016] Optionally, the feeding channel is equipped with several inclined guide plates, which together with the feeding channel form an upper deceleration chamber for the steel ball to fall in a serpentine trajectory.

[0017] The beneficial effects of the embodiments of this application are as follows:

[0018] 1. This application uses an upper deceleration chamber and a lower deceleration chamber to reduce the speed of the steel ball in multiple stages, and uses a material guide channel to separate the high-pressure airflow from the steel ball, thereby preventing the high-pressure airflow used to prevent coal powder from floating out from accelerating the falling of the steel ball, thus reducing the falling speed of the steel ball and improving the service life of the machine.

[0019] 2. When the steel ball passes through the deceleration chamber, it first overcomes the pushing force of the high-pressure airflow on the deceleration plate, causing the deceleration plate to flip. During this process, the resistance overcome by the steel ball is relatively small, allowing the steel ball to decelerate slowly, thereby reducing the impact force of the steel ball on the deceleration plate. Then, the steel ball will simultaneously overcome the pushing force of the high-pressure airflow on the buffer plate and the restoring force of the torsion spring towards its natural state, allowing the steel ball to decelerate rapidly after slow deceleration, thereby reducing the falling speed of the steel ball. Since the steel ball is already in contact with the deceleration plate at this point, even if the steel ball decelerates rapidly, it will not generate a large impact force on the deceleration plate, effectively protecting the deceleration plate.

[0020] 3. After the steel ball is decelerated at the high end of the rocker, the high-pressure airflow entering the air duct will drive the windmill to rotate. The windmill will drive the second shaft and cam to rotate through the first shaft. During the rotation, the cam will intermittently push the high end of the rocker downward, so that the steel ball will make an uphill motion when it moves on the rocker, so as to further decelerate the steel ball. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure in an embodiment of this application;

[0022] Figure 2 This is a schematic cross-sectional view of the overall structure in the embodiments of this application;

[0023] Figure 3 This is a cross-sectional view of the feeding channel in an embodiment of this application;

[0024] Figure 4 This is a cross-sectional view of the deceleration channel in an embodiment of this application;

[0025] Figure 5 This is a schematic diagram of the friction unit and the material guide channel in the embodiments of this application;

[0026] Figure 6 This is a schematic diagram of the friction unit in an embodiment of this application;

[0027] Figure 7 This is a schematic diagram of the structure of the windmill, cam, and rocker in the embodiments of this application.

[0028] Reference numerals: 1. Deceleration channel; 11. Material guide channel; 12. Material guide chamber; 2. High-pressure air pipe; 3. Feeding channel; 31. Material guide plate; 32. Upper deceleration chamber; 4. Friction unit; 41. Deceleration plate; 411. Torsion spring; 412. Air jet; 42. Lower deceleration chamber; 43. Air guide pipe; 44. Windmill; 441. First rotating shaft; 45. Cam; 451. Second rotating shaft; 46. Rocker; 461. Horizontal shaft. Detailed Implementation

[0029] Preferred embodiments of this application will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of this application and are not intended to limit the scope of protection of this application.

[0030] See Figure 1-7 This application discloses a steel ball feeding device suitable for a double-inlet, double-outlet coal mill. For example... Figure 1 and Figure 2 As shown, a steel ball feeding device suitable for a double-inlet, double-outlet coal mill includes a deceleration channel 1, a high-pressure air pipe 2, and a feeding channel 3. The high-pressure air pipe 2 and the feeding channel 3 are connected to the top of the deceleration channel 1. Steel balls can enter the deceleration channel 1 through the feeding channel 3. After the deceleration channel 1 decelerates the steel balls, they will fall into the equipment below. The high-pressure air pipe 2 can blow high-pressure airflow into the deceleration channel 1 to prevent coal dust from floating out.

[0031] like Figure 3 As shown, several inclined guide plates 31 are installed in the feeding channel 3, and the guide plates 31 and the feeding channel 3 together form the upper deceleration chamber 32. When the worker adds the steel ball into the upper deceleration chamber 32, the steel ball will fall in the upper deceleration chamber 32 in a serpentine trajectory, so that the direction of the steel ball's movement changes continuously, thereby achieving the initial deceleration of the steel ball.

[0032] like Figure 2 and Figure 3As shown, a vertically arranged guide channel 11 is fixedly embedded in the deceleration channel 1. The guide channel 11 has a spiral guide cavity 12, the top opening of which is located directly below the feeding channel 3. Several spirally arranged friction units 4 are arranged inside the guide cavity 12. After the first stage of deceleration, the steel ball enters the guide cavity 12, where the friction units 4 rub against the moving steel ball, achieving further deceleration.

[0033] It is worth noting that the high-pressure airflow blown out by the high-pressure air pipe 2 will pass through the inside of the material guide channel 11. The material guide channel 11 separates the steel ball from the high-pressure airflow blown out by the high-pressure air pipe 2, so that the high-pressure airflow will not exert a pushing force on the steel ball during the downward blowing process, thereby preventing the steel ball from falling at too fast a speed.

[0034] like Figure 4 and Figure 5 As shown, the friction unit 4 includes a deceleration plate 41 located in the guide cavity 12. One end of the deceleration plate 41 is rotatably connected to the guide channel 11 and shares the same torsion spring 411 with the guide channel 11. The other end of the deceleration plate 41 and one side wall of the guide cavity 12 together form a lower deceleration cavity 42. When the torsion spring 411 is in its natural state, the width of the lower deceleration cavity 42 is smaller than the diameter of the steel ball. Therefore, when the steel ball passes through the lower deceleration cavity 42, it will collide with the deceleration plate 41, achieving secondary deceleration of the steel ball. After the steel ball hits the deceleration plate 41, it will push the deceleration plate 41 to flip, making the width of the lower deceleration cavity 42 larger. At this time, the torsion spring 411 will deform and cause the deceleration plate 41 to generate resistance against the steel ball, thereby achieving tertiary deceleration of the steel ball.

[0035] The friction unit 4 includes an air guide pipe 43 installed on the material guide channel 11. One end of the air guide pipe 43 is open along the trajectory of the high-pressure airflow blown out by the high-pressure air pipe 2, and the other end of the air guide pipe 43 opens towards the material guide chamber 12. Part of the high-pressure airflow enters the air guide pipe 43 during its downward motion and is then blown into the material guide chamber 12. The angle between the direction of motion of the high-pressure airflow blown out by the air guide pipe 43 and the direction of motion of the steel ball when passing through the lower deceleration chamber 42 is obtuse, allowing the high-pressure airflow to generate resistance to the falling of the ball, thus achieving four-stage deceleration of the steel ball.

[0036] It is worth noting that the end of the air duct 43 used to receive the high-pressure airflow is a rigid tube with a flared shape, which increases the total amount of high-pressure airflow entering the air duct 43, thereby increasing the resistance encountered by the steel ball during its fall.

[0037] The deceleration plate 41 is provided with a jet nozzle 412. The end of the air guide pipe 43 facing the material guide cavity 12 is connected to the jet nozzle 412. The end of the air guide pipe 43 is set in a constricted shape and is a flexible tube. Therefore, when the high-pressure airflow enters the jet nozzle 412, it will generate a pushing force on the end of the air guide pipe 43 facing the material guide cavity 12, causing the deceleration plate 41 to flip into the material guide cavity 12. The width of the lower deceleration cavity 42 will decrease, so that the deceleration plate 41 can generate greater resistance to the steel ball, so as to achieve five decelerations of the steel ball.

[0038] It is worth noting that when the steel ball passes through the deceleration chamber, it first overcomes the pushing force of the high-pressure airflow on the deceleration plate 41, causing the deceleration plate 41 to flip until the torsion spring 411 returns to its natural state. During this process, the resistance overcome by the steel ball is relatively small, allowing the steel ball to decelerate slowly, thereby reducing the impact force of the steel ball on the deceleration plate 41. Then, the steel ball will continue to push the deceleration plate 41 to flip. At this time, the steel ball will simultaneously overcome the pushing force of the high-pressure airflow on the buffer plate and the restoring force of the torsion spring 411 tending to its natural state, allowing the steel ball to decelerate quickly after slow deceleration, thereby reducing the falling speed of the steel ball. Since the steel ball has already come into contact with the deceleration plate 41 at this time, even if the steel ball decelerates quickly, it will not generate a large impact force on the deceleration plate 41, effectively protecting the deceleration plate 41.

[0039] like Figures 5 to 7 As shown, the friction unit 4 includes a windmill 44, a cam 45, and a rocker plate 46. The windmill 44 is located inside the air guide pipe 43 and is rotatably connected to the air guide pipe 43 via a first rotating shaft 441. The cam 45 is located outside the air guide pipe 43 and is rotatably connected to the air guide pipe 43 via a second rotating shaft 451. The first rotating shaft 441 is connected to the second rotating shaft 451 via a belt drive. The rocker plate 46 is located inside the lower deceleration chamber 42, and the middle part of the rocker plate 46 is rotatably connected to the material guide chamber 12 via a horizontal shaft 461.

[0040] When the rocker plate 46 is not under force, one end of the rocker plate 46 will be higher than the bottom cavity wall of the guide cavity 12, and the other end of the rocker plate 46 will be lower than the bottom cavity wall of the guide cavity 12. During the falling process, the bottom of the steel ball in the guide cavity 12 will first collide with the high end of the rocker plate 46 to achieve six decelerations of the steel ball.

[0041] When the steel ball moves to the high end of the rocker arm 46, the high-pressure airflow entering the air duct 43 will drive the windmill 44 to rotate. The windmill 44 will drive the second shaft 451 and the cam 45 to rotate through the first shaft 441. During the rotation, the cam 45 will intermittently push the high end of the rocker arm 46 downward to make the steel ball climb uphill when it moves on the rocker arm 46, so as to achieve seven decelerations of the steel ball. When the steel ball is about to move away from the rocker arm 46, the cam 45 will gradually disengage from the rocker arm 46. At this time, the steel ball will cause the rocker arm 46 to flip back to its original position due to its own gravity, so that the rocker arm 46 can continue to slow down the subsequent steel balls.

[0042] The working principle of this application is as follows: during the feeding process of the steel ball, the steel ball will first enter the feeding channel 3 and pass through the upper deceleration chamber 32 in a serpentine motion trajectory, thereby realizing the first-stage deceleration of the steel ball.

[0043] Then the steel ball will enter the guide chamber 12 and spiral down. The guide channel 11 separates the steel ball from the high-pressure airflow blown out by the high-pressure air pipe 2, so that the high-pressure airflow will not exert a pushing force on the steel ball during the downward blowing process, so as to avoid the high-pressure airflow from accelerating the steel ball.

[0044] Next, a portion of the high-pressure airflow will enter the air guide pipe 43 during its downward blowing process, and then be blown into the material guide chamber 12 through the air guide pipe 43. The angle between the direction of movement of this portion of high-pressure airflow and the direction of movement of the steel ball is an obtuse angle, which allows the high-pressure airflow to generate resistance to the falling of the ball, thus achieving two-stage deceleration of the steel ball.

[0045] The bottom of the steel ball will then collide with the high end of the rocker arm 46, achieving a three-stage deceleration of the steel ball.

[0046] Next, the steel ball will move onto the rocker arm 46. The high-pressure airflow entering the air duct 43 will drive the windmill 44 to rotate. The windmill 44 will drive the second shaft 451 and the cam 45 to rotate through the first shaft 441. During the rotation, the cam 45 will intermittently push the high end of the rocker arm 46 downward to make the steel ball climb when it moves on the rocker arm 46, thus achieving four-stage deceleration of the steel ball.

[0047] The steel ball will then collide with the deceleration plate 41, achieving five-stage deceleration of the steel ball.

[0048] Next, the steel ball will push the buffer plate to flip. At this time, the steel ball will overcome the pushing force of the high-pressure airflow on the deceleration plate 41, realizing the six-stage deceleration of the steel ball.

[0049] Then the steel ball will continue to push the deceleration plate 41 to flip. At this time, the steel ball will simultaneously overcome the pushing force of the high-pressure airflow on the buffer plate and the restoring force of the torsion spring 411 towards its natural state, thus achieving seven-level deceleration of the steel ball.

[0050] In summary, this application reduces the falling speed of the steel ball by performing multi-stage deceleration and avoiding the high-pressure airflow used to prevent coal dust from escaping, thereby improving the service life of the machine.

[0051] It should be noted that in the description of this application, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0052] Furthermore, it should be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0053] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0054] The technical solutions of this application have been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. A steel ball feeding device suitable for a double-inlet, double-outlet coal mill, characterized in that, The system includes a deceleration channel (1), a high-pressure air pipe (2), and a feeding channel (3). The high-pressure air pipe (2) and the feeding channel (3) are connected to the top of the deceleration channel (1). A vertically arranged guide channel (11) is installed inside the deceleration channel (1). A spiral guide cavity (12) is provided on the guide channel (11). The top opening of the guide cavity (12) is located directly below the feeding channel (3). Several friction units (4) are provided inside the guide cavity (12) for the steel balls to abut against each other during rolling. The high-pressure airflow blown out by the high-pressure air pipe (2) will pass through the inside of the guide channel (11). The guide channel (11) is used to separate the steel balls from the high-pressure airflow blown out by the high-pressure air pipe (2). The friction unit (4) includes a deceleration plate (41) located inside the guide cavity (12). One end of the plate is rotatably connected to the material guide channel (11) and is connected to the same torsion spring (411) as the material guide channel (11). The other end of the deceleration plate (41) and one side wall of the material guide cavity (12) together form the lower deceleration cavity (42). When the torsion spring (411) is in its natural state, the width of the lower deceleration chamber (42) is smaller than the diameter of the steel ball. When the steel ball passes through the lower deceleration chamber (42), it will push the deceleration plate (41) to flip, making the width of the lower deceleration chamber (42) larger. The friction unit (4) includes an air guide pipe (43) installed on the material guide channel (11). One end of the air guide pipe (43) is located on the trajectory of the high-pressure airflow blown out by the high-pressure air pipe (2), and the other end of the air guide pipe (43) is open towards the material guide chamber (12). The angle between the direction of the high-pressure airflow blown out by the end of the air guide pipe (43) and the direction of the steel ball when it passes through the lower deceleration chamber (42) is an obtuse angle.

2. The ball-feeding device for a double-inlet, double-outlet coal mill according to claim 1, characterized in that, The deceleration plate (41) is provided with a jet nozzle (412). The air guide pipe (43) is set with a constricted opening at one end facing the feed chamber (12) and connected to the jet nozzle (412). The end of the air guide pipe (43) is a flexible hose. The high-pressure airflow will push the deceleration plate (41) to flip during the process of entering the jet nozzle (412), so that the width of the lower deceleration chamber (42) is reduced.

3. A steel ball feeding device suitable for a double-inlet, double-outlet coal mill according to claim 2, characterized in that, The friction unit (4) includes a rocker plate (46) located in the lower deceleration chamber (42), and the middle part of the rocker plate (46) is rotatably connected to the material guide chamber (12) via a horizontal shaft (461). When the rocker (46) is not under force, one end of the rocker (46) will be higher than the bottom cavity wall of the guide cavity (12), and the other end of the rocker (46) will be lower than the bottom cavity wall of the guide cavity (12). The steel ball in the guide cavity (12) will pass through the high end and low end of the rocker (46) in sequence.

4. A steel ball feeding device suitable for a double-inlet, double-outlet coal mill according to claim 3, characterized in that, The friction unit (4) further includes a windmill (44) and a cam (45). The windmill (44) is located inside the air duct (43) and is rotatably connected to the air duct (43) via a first rotating shaft (441). The cam (45) is located outside the air duct (43) and is rotatably connected to the air duct (43) via a second rotating shaft (451). The first rotating shaft (441) is connected to the second rotating shaft (451) via a belt drive. When the high-pressure airflow passes through the air duct (43), it will drive the windmill (44) to rotate. The windmill (44) will drive the second shaft (451) and cam (45) to rotate through the first shaft (441). During the rotation, the cam (45) will intermittently push the high end of the rocker (46) to flip downward.

5. A steel ball feeding device suitable for a double-inlet, double-outlet coal mill according to claim 4, characterized in that, When the steel ball moves to the high end of the rocker (46), the cam (45) will push the high end of the rocker (46) to flip downward until the steel ball moves to the other end of the rocker (46).

6. A steel ball feeding device suitable for a double-inlet, double-outlet coal mill according to any one of claims 1 to 5, characterized in that, The feeding channel (3) is equipped with several inclined guide plates (31), which together with the feeding channel (3) form an upper deceleration chamber (32) for the steel ball to fall in a serpentine trajectory.

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