An internal sealing structure for a HP medium-speed coal mill

Abstract

The present invention discloses an internal sealing structure for a HP medium-speed coal mill, which relates to the technical field of coal mills and includes an inner wall of the coal mill, a cover plate connected to one side of the inner wall of the coal mill, bolts connected to the upper and lower sides of the cover plate, a drive shaft passing through one side of the cover plate, a sealing plate connected to the outer surface of the drive shaft, and a first support ring connected to one side of the sealing plate. The present invention uses a wear-resistant ring, a ventilation hole, an annular airbag, a one-way valve core, a pressure relief hole, a plug, a sealing cover, a damping telescopic rod, a spring, and an air delivery nozzle. When the sealing plate vibrates, the annular airbag is subjected to pressure, so that the air in the annular airbag passes through the air delivery nozzle and enters the annular housing to apply pressure to a plug. After being subjected to pressure, the plug moves to buffer the impact force, and at the same time, a spring and a damping telescopic rod are contracted, which can buffer the sealing plate and reduce damage caused by collisions, while compensating for gaps to prevent coal powder and gas leakage in the machine.

Description

Technical Field

[0001] The invention relates to the technical field of coal mills, in particular to an internal sealing structure of a HP medium-speed coal mill. Background Art

[0002] HP medium-speed coal mill is one of the commonly used equipment in the pulverizing system of large-capacity boiler units in thermal power plants. It is also one of the main energy-consuming equipment of boiler units. It is used to grind and crush coal to make it easier to burn and make the coal burn more fully. When using the HP medium-speed coal mill, multiple sealing components are required to increase the sealing of various parts to prevent coal powder and gas leakage. The surface of the drive shaft is also provided with a sealing structure to prevent coal powder leakage and increase the wear of the drive shaft.

[0003] When the internal sealing structure of the existing HP medium-speed coal mill is in use, the driving shaft needs to drive the rollers, bowls and other structures to rotate. The rollers and bowls are prone to vibration when grinding the coal powder during rotation, which can easily cause the sealing plate to collide with the inner wall of the coal mill. Over time, it is easy to cause the sealing plate to crack and break, thereby affecting the sealing performance of the structure, causing coal powder and air to leak out easily and pollute the environment, which is inconvenient to use. In addition, the internal sealing structure of the existing HP medium-speed coal mill is mainly used to prevent coal powder and air from leaking to the outside. Coal powder will still enter the sealing structure, which can easily aggravate the wear of the sealing plate and the driving shaft, affecting the service life of the structure. The replacement and maintenance costs of the driving shaft and the sealing plate are high, resulting in a waste of funds and inconvenience in use. Summary of the Invention

[0004] Based on this, the purpose of the present invention is to provide an internal sealing structure for a HP medium-speed coal mill to solve the technical problems of easy collision with the sealing plate and coal powder entering during vibration, thereby aggravating structural wear.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an internal sealing structure of an HP medium-speed coal mill, comprising an inner wall of the coal mill, a cover plate connected to one side of the inner wall of the coal mill, bolts connected to the upper and lower sides of one side of the cover plate, a drive shaft passing through one side of the cover plate, a sealing plate connected to the outer surface of the drive shaft, a first support ring connected to one side of the sealing plate, and a second support ring connected to the other side of the sealing plate, a dustproof component is provided on one side of the outer surface of the drive shaft, and a compensation component is provided inside the inner wall of the coal mill.

[0006] By adopting the above technical solution, the dust-proof component guides the coal powder in the machine through the rubber sleeve to reduce the amount of coal powder entering the sealing structure, and at the same time prevents the rubber sleeve from being worn out through the wear-resistant sleeve. When the compensation component vibrates through the sealing plate, the annular airbag is subjected to pressure, so that the air in the annular airbag passes through the air nozzle and enters the annular shell to apply pressure to a plug. After being pressurized, the plug moves to cushion the impact force.

[0007] Furthermore, the dust-proof component includes a rubber sleeve connected to one side of the outer surface of the drive shaft and a limit groove opened on the top side of the drive shaft, and a limit groove is opened on the bottom side of the drive shaft, an air avoidance groove is opened on the inner side of the rubber sleeve, two rubber limit blocks are connected to the inner side of the air avoidance groove, a cavity is opened inside the rubber sleeve, and a wear-resistant sleeve is connected to the outer surface of the rubber sleeve.

[0008] By adopting the above technical solution, the coal powder in the machine is guided by the rubber sleeve in daily use to reduce the coal powder entering the sealing structure, and the wear-resistant sleeve is used to prevent the rubber sleeve from being worn out.

[0009] Furthermore, the compensation component includes an annular shell connected to the inner wall of the coal mill, and a bolt passes through one side of the annular shell, a ventilation hole is provided on the top of the annular shell, the inner ring of the annular shell is connected to three annular air bags, the outer rings of the three annular air bags are respectively connected to multiple gas nozzles, the inner rings of the three annular air bags are connected to wear-resistant rings, the bottom of the annular shell is connected to three one-way valve cores, the back of the annular shell is provided with a pressure relief hole, the back of the pressure relief hole is connected to a sealing cover, the inside of the annular shell is connected to multiple damping telescopic rods, one end of each of the damping telescopic rods is connected to a plug, and the outer surfaces of the multiple damping telescopic rods are provided with springs.

[0010] By adopting the above technical solution, when the sealing plate vibrates, the annular airbag is subjected to pressure, so that the air in the annular airbag passes through the air delivery nozzle and enters the annular shell to apply pressure to a plug. After being pressurized, the plug moves to cushion the impact force.

[0011] Furthermore, one side of the rubber sleeve is in a truncated cone shape, and the diameter of one end of the drive shaft is larger than the diameter of the other end of the drive shaft.

[0012] By adopting the above technical solution, when the position of the rubber limit block corresponds to the position of the limit groove, the rubber limit block restores its shape, thereby clamping the rubber sleeve on the drive shaft. In daily use, the rubber sleeve guides the coal powder in the machine to reduce the coal powder entering the sealing structure.

[0013] Furthermore, the sealing cover is threadedly connected to the annular shell, and the plug is slidably connected to the annular shell.

[0014] By adopting the above technical solution, a plug moves after being subjected to pressure to buffer the impact force, while causing a spring and a damping telescopic rod to contract. At the same time, the other spring loses pressure and drives the other plug to move, pressing air into the other side of the annular airbag, thereby causing the other side of the annular airbag to expand again to compensate for the gap.

[0015] Furthermore, one side of the bottom of the rubber limit block is sloped, and the two rubber limit blocks are mirror-distributed along the horizontal axis center line of the drive shaft.

[0016] By adopting the above technical solution, when the rubber sleeve is put on, the slope on the rubber limit block is subjected to pressure, causing the rubber limit block to deform and shrink into the empty groove. When the position of the rubber limit block corresponds to the position of the limit groove, the rubber limit block restores its shape, thereby clamping the rubber sleeve on the drive shaft.

[0017] Furthermore, the width of the second support ring is greater than that of the first support ring, and the outer diameters of the first support ring and the second support ring are equal to the outer diameter of the sealing plate.

[0018] By adopting the above technical solution, the sealing plate is provided to increase the structural sealing to avoid coal powder and gas leakage in the machine causing environmental pollution. At the same time, the first support ring and the second support ring are provided to facilitate the separation of the sealing plates to avoid the sealing plates sticking together.

[0019] Furthermore, the ventilation hole is in an "L" shape, and the annular shell is detachably connected to the inner wall of the coal mill by bolts.

[0020] By adopting the above technical solution, a plug moves after being subjected to pressure to buffer the impact force, while causing a spring and a damping telescopic rod to contract. At the same time, the other spring loses pressure and drives the other plug to move, pressing air into the other side of the annular airbag, thereby causing the other side of the annular airbag to expand again to compensate for the gap.

[0021] In summary, the present invention mainly has the following beneficial effects:

[0022] 1. The present invention comprises a wear-resistant ring, a ventilation hole, an annular airbag, a one-way valve core, a pressure relief hole, a plug, a sealing cover, a damping telescopic rod, a spring and an air delivery nozzle. When the sealing plate vibrates, the annular airbag is subjected to pressure, so that the air in the annular airbag passes through the air delivery nozzle and enters the annular housing to apply pressure to one plug. After being subjected to pressure, one plug moves to buffer the impact force, and at the same time, a spring and a damping telescopic rod are contracted. At the same time, the other spring loses pressure and drives the other plug to move, pressing air into the other side of the annular airbag, so that the other side of the annular airbag expands again to compensate for the gap, thereby preventing coal powder and air in the coal mill from leaking through the gap. Afterwards, the air pressure in the annular housing and the annular airbag is balanced by the return of one spring and the contraction of the other spring, so as to prepare for the next impact. At the same time, the wear-resistant ring prevents the annular airbag from being worn, and can buffer the sealing plate to reduce damage caused by collision, and at the same time compensate for the gap to prevent coal powder and gas in the machine from leaking.

[0023] 2. The present invention uses a rubber sleeve, a rubber limit block, a rubber limit groove, a wear-resistant sleeve, a cavity and an avoidance groove. The rubber sleeve can be installed by directly putting the rubber sleeve on the drive shaft. When the rubber sleeve is put on, the slope on the rubber limit block is subjected to pressure, causing the rubber limit block to deform and shrink into the avoidance groove. When the position of the rubber limit block corresponds to the position of the limit groove, the rubber limit block restores its shape, thereby clamping the rubber sleeve on the drive shaft. When replacement is needed, it is only necessary to pull out the rubber sleeve with force. In daily use, the rubber sleeve is used to guide the coal powder in the machine to reduce the coal powder entering the sealing structure. At the same time, the wear-resistant sleeve is used to prevent the rubber sleeve from being worn, effectively reducing the entry of coal powder and thus reducing the wear of the drive shaft and the sealing plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the drive shaft structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the annular housing structure of the present invention;

[0027] Figure 4 Schematic diagram of the cross-sectional structure of the annular shell of the present invention;

[0028] Figure 5 For the present invention Figure 4 A magnified view of the structure at point A;

[0029] Figure 6 This is a schematic diagram of the side cross-sectional structure of the annular shell of the present invention;

[0030] Figure 7 For the present invention Figure 6 A magnified view of the structure at point B in FIG.

[0031] In the figure: 1. Inner wall of coal mill; 2. Drive shaft; 3. Cover plate; 4. Bolt; 5. First support ring; 6. Second support ring; 7. Sealing plate; 8. Dustproof assembly; 801. Rubber sleeve; 802. Rubber limit block; 803. Limiting groove; 804. Wear-resistant sleeve; 805. Cavity; 806. Air avoidance groove; 9. Compensating assembly; 901. Annular shell; 902. Wear-resistant ring; 903. Ventilation hole; 904. Annular airbag; 905. One-way valve core; 906. Pressure relief hole; 907. Sealing cover; 908. Plug; 909. Damping telescopic rod; 910. Spring; 911. Gas nozzle. DETAILED DESCRIPTION

[0032] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0033] The following describes an embodiment of the present invention based on its overall structure.

[0034] An internal sealing structure of a HP medium-speed coal mill, such as Figure 1 and 2 As shown, it includes a coal mill inner wall 1, a cover plate 3 is connected to one side of the coal mill inner wall 1, bolts 4 are connected to the upper and lower sides of one side of the cover plate 3, a drive shaft 2 passes through one side of the cover plate 3, the outer surface of the drive shaft 2 is connected to a sealing plate 7, a first support ring 5 is connected to one side of the sealing plate 7, a second support ring 6 is connected to the other side of the sealing plate 7, the width of the second support ring 6 is greater than the width of the first support ring 5, and the outer diameters of the first support ring 5 and the second support ring 6 are equal to the outer diameter of the sealing plate 7, a dustproof component 8 is provided on one side of the outer surface of the drive shaft 2, which effectively reduces the entry of coal powder and thus reduces the wear of the drive shaft 2 and the sealing plate 7, and a compensation component 9 is provided inside the coal mill inner wall 1, which can cushion the sealing plate 7 to reduce damage caused by collision, and at the same time compensate for the gap to avoid leakage of coal powder and gas in the machine.

[0035] See Figure 1 and 2The dustproof component 8 includes a rubber sleeve 801 connected to one side of the outer surface of the drive shaft 2 and a limiting groove 803 opened on one side of the top of the drive shaft 2, and a limiting groove 803 is opened on the bottom side of the drive shaft 2, and an air avoidance groove 806 is opened on one side of the inner side of the rubber sleeve 801. Two rubber limiting blocks 802 are connected to the inner side of the air avoidance groove 806, and a cavity 805 is opened inside the rubber sleeve 801. The outer surface of the rubber sleeve 801 is connected to a wear-resistant sleeve 804. One side of the rubber sleeve 801 is truncated cone-shaped, and the diameter of one end of the drive shaft 2 is larger than the diameter of the other end of the drive shaft 2. The bottom side of the rubber limiting block 802 is sloped, and the two rubber limiting blocks 802 are mirror-distributed along the horizontal axis center line of the drive shaft 2, effectively reducing the entry of coal powder and thus reducing the wear of the drive shaft 2 and the sealing plate 7, and can buffer the sealing plate 7 to reduce the damage caused by collision, while compensating for the gap to avoid leakage of coal powder and gas in the machine.

[0036] See Figure 1 、 3 , 4, 5, 6 and 7, the compensation component 9 includes an annular shell 901 connected to the inner wall 1 of the coal mill, and a bolt 4 is passed through one side of the annular shell 901, a ventilation hole 903 is opened on the top of the annular shell 901, the inner ring of the annular shell 901 is connected to three annular air bags 904, the outer rings of the three annular air bags 904 are respectively connected to multiple gas nozzles 911, the inner rings of the three annular air bags 904 are all connected to wear-resistant rings 902, the bottom of the annular shell 901 is connected to three one-way valve cores 905, the annular shell 901 is provided with a plurality of air nozzles 911, and the inner rings of the three annular air bags 904 are connected to wear-resistant rings 902. A pressure relief hole 906 is opened on the back, and a sealing cover 907 is connected to the back of the pressure relief hole 906. A plurality of damping telescopic rods 909 are connected to the inside of the annular shell 901, and one end of the plurality of damping telescopic rods 909 is connected to a plug 908. The outer surfaces of the plurality of damping telescopic rods 909 are provided with springs 910. The sealing cover 907 is threadedly connected to the annular shell 901, and the plug 908 is slidingly connected to the annular shell 901. The ventilation hole 903 is "L"-shaped, and the annular shell 901 is detachably connected to the inner wall 1 of the coal mill by bolts 4.

[0037] The implementation principle of this embodiment is as follows: first, the staff can complete the installation of the rubber sleeve 801 by directly putting the rubber sleeve 801 on the drive shaft 2. When putting on the rubber sleeve 801, the slope on the rubber limit block 802 is subjected to pressure, causing the rubber limit block 802 to deform and shrink into the empty groove 806. When the position of the rubber limit block 802 corresponds to the position of the limit groove 803, the rubber limit block 802 restores its shape, thereby clamping the rubber sleeve 801 on the drive shaft 2. When replacement is required, the staff only needs to pull out the rubber sleeve 801 with force, and then the staff will pass the drive shaft 2 through the inner wall 1 of the coal mill, and then the staff will pass the one-way valve core 905. Inflate the annular shell 901, and allow air to circulate between the annular shell 901 and the annular airbag 904 through the air delivery nozzle 911, so that air can enter the annular airbag 904. When the air pressure in the annular airbag 904 and the annular shell 901 is too high, the plug 908 is moved by pressure to compress the spring 910 and the damping telescopic rod 909, and at the same time expose the pressure relief hole 906. Then, the excess air is discharged through the pressure relief hole 906, so that the spring 910 and the damping telescopic rod 909 are in a semi-contracted state. At the same time, the staff stops inflating and installs the sealing cover 907 to block the pressure relief hole 906. Then, the staff tightens the annular shell 901 with the bolt 4. The annular shell 901 is installed on the inner wall 1 of the coal mill. Then the staff put the first support ring 5, the second support ring 6 and the sealing plate 7 into the annular shell 901 and then installed the cover plate 3 on the inner wall 1 of the coal mill through the bolts 4. In daily use, the rubber sleeve 801 is used to guide the coal powder in the machine to reduce the coal powder entering the sealing structure. At the same time, the wear-resistant sleeve 804 is used to prevent the rubber sleeve 801 from being worn. When the sealing plate 7 vibrates, the annular airbag 904 is pressurized, so that the air in the annular airbag 904 passes through the gas nozzle 911 and enters the annular shell 901, applying pressure to a plug 908. After the plug 908 is pressurized The movement buffers the gas pressure, thereby buffering the sealing plate 7, and at the same time, a spring 910 and a damping telescopic rod 909 are contracted. At the same time, the other spring 910 loses pressure and drives the other plug 908 to move to press the air into the other side of the annular airbag 904, so that the other side of the annular airbag 904 expands again to compensate for the gap, thereby preventing the coal powder and air in the pulverizer from leaking through the gap. After that, the air pressure in the annular shell 901 and the annular airbag 904 is balanced by resetting one spring 910 and contracting the other spring 910, so as to cope with the next impact. At the same time, the wear-resistant ring 902 is used to prevent the annular airbag 904 from being worn out.

[0038] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiment without creative contribution as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. An internal sealing structure of a HP medium-speed coal mill, comprising an inner wall of the coal mill (1), characterized in that: A cover plate (3) is connected to one side of the inner wall (1) of the coal mill, and bolts (4) are connected to the upper side and the lower side of the cover plate (3). A drive shaft (2) is passed through one side of the cover plate (3), and a sealing plate (7) is connected to the outer surface of the drive shaft (2). A first support ring (5) is connected to one side of the sealing plate (7), and a second support ring (6) is connected to the other side of the sealing plate (7). A dustproof component (8) is provided on one side of the outer surface of the drive shaft (2), and the dustproof component (8) includes a rubber sleeve (801) connected to one side of the outer surface of the drive shaft (2) and a limiting groove (803) opened on one side of the top of the drive shaft (2). The rubber sleeve (801) ) is in a truncated cone shape, and the diameter of one end of the drive shaft (2) is larger than the diameter of the other end of the drive shaft (2), and a limiting groove (803) is provided on one side of the bottom of the drive shaft (2), and an air avoidance groove (806) is provided on one side of the interior of the rubber sleeve (801), and two rubber limiting blocks (802) are connected to the interior of the air avoidance groove (806), and the bottom side of the rubber limiting block (802) is in a slope shape, and the two rubber limiting blocks (802) are mirror-imaged along the horizontal axis center line of the drive shaft (2), a cavity (805) is provided inside the rubber sleeve (801), and a wear-resistant sleeve (804) is connected to the outer surface of the rubber sleeve (801), and the inner wall of the coal mill ( 1) is provided with a compensation assembly (9), the compensation assembly (9) comprising an annular shell (901) connected to the inside of the coal mill inner wall (1), and a bolt (4) is passed through one side of the annular shell (901), and the annular shell (901) is detachably connected to the coal mill inner wall (1) via the bolt (4), a ventilation hole (903) is provided on the top of the annular shell (901), and the ventilation hole (903) is in an "L" shape, the inner ring of the annular shell (901) is connected to three annular air bags (904), the outer rings of the three annular air bags (904) are respectively connected to a plurality of gas delivery nozzles (911), and the inner rings of the three annular air bags (904) are all connected to the inner rings of the three annular air bags (904). A wear-resistant ring (902) is connected, three one-way valve cores (905) are connected to the bottom of the annular shell (901), a pressure relief hole (906) is opened on the back of the annular shell (901), a sealing cover (907) is connected to the back of the pressure relief hole (906), the sealing cover (907) is threadedly connected to the annular shell (901), a plurality of damping telescopic rods (909) are connected inside the annular shell (901), one end of the plurality of damping telescopic rods (909) are connected to a plug (908), and the plug (908) is slidably connected to the annular shell (901), and the outer surfaces of the plurality of damping telescopic rods (909) are provided with springs (910).

2. The internal sealing structure of an HP medium-speed coal mill according to claim 1, characterized in that: The width of the second support ring (6) is greater than the width of the first support ring (5), and the diameters of the outer circles of the first support ring (5) and the second support ring (6) are equal to the diameter of the outer circle of the sealing plate (7).

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