A kind of angle saw-tooth type sealing ring assembly for lower frame of medium-speed coal mill in thermal power plant

Abstract

The application discloses a kind of angle saw-tooth type sealing ring assemblies for medium-speed coal mill lower frame body in thermal power plant, it is related to coal mill sealing assembly field, including coal mill body, the rack of lower end setting in coal mill body, the main shaft of being set in the middle of rack, multiple groups of ring groove frames are installed on the rack, multiple groups of ring grooves are spaced apart and set on the ring groove frame, at least one side of the ring groove is inclined surface, multiple groups of fan-shaped mounting frames that are spliced into annular mounting ring are set on the main shaft in the corresponding position of ring groove, base plate is installed on the mounting ring, graphite layer is set on the base plate, and the graphite layer is in close contact with the inclined surface of ring groove.The application makes multiple groups of ring grooves from top to bottom present dentiform division, forms annular mounting ring by multiple groups of fan-shaped structure mounting frames, makes the side of annular graphite sheet that is provided with graphite contact with the inclined surface of ring groove, can ensure that pulverized coal does not pass through sealing assembly when main shaft rotates, and plays a good sealing effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of coal mill sealing assembly, in particular to an angle sawtooth type sealing ring assembly for a medium-speed coal mill lower frame body in a thermal power plant. BACKGROUND

[0002] The raw coal pulverizer used in large coal-fired places such as thermal power plants mostly uses a medium-speed coal mill, which mainly includes a middle frame body, a lower frame body, a rotating grinding disc installed on a speed reducer, a grinding roller rolling on the grinding disc, a driving main motor, a loading frame installed in the middle frame body, and a loading pull rod cylinder installed on the loading frame.

[0003] A Chinese patent with the publication number CN102287532A discloses an angle sawtooth type sealing ring assembly for a medium-speed coal mill lower frame body in a thermal power plant, which includes a fixed angle sawtooth type sealing ring. The fixed angle sawtooth type sealing ring is composed of an upper fixed ring-shaped angle sawtooth type sealing ring and a lower fixed ring-shaped angle sawtooth type sealing ring. Both the upper fixed ring-shaped angle sawtooth type sealing ring and the lower fixed ring-shaped angle sawtooth type sealing ring are placed outside the main shaft with a 0.6mm gap between the main shaft. Both the upper fixed ring-shaped angle sawtooth type sealing ring and the lower fixed ring-shaped angle sawtooth type sealing ring are integrally made of steel material and are processed into a certain shape.

[0004] For the above-mentioned related technology, the inventor believes that when using the above sealing assembly, since the upper fixed ring-shaped angle sawtooth type sealing ring and the lower fixed ring-shaped angle sawtooth type sealing ring are both placed outside the main shaft with a 0.6mm gap between the main shaft, the tiny coal powder is still easy to pass through the gap, so that the sealing assembly cannot achieve the expected sealing effect. SUMMARY

[0005] Therefore, the purpose of the present application is to provide an angle sawtooth type sealing ring assembly for a medium-speed coal mill lower frame body in a thermal power plant, so as to solve the technical problem that the existing angle sawtooth type sealing ring assembly for a medium-speed coal mill lower frame body in a thermal power plant still has a gap between the main shaft, resulting in poor sealing effect.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solution: an angle sawtooth type sealing ring assembly for a medium-speed coal mill lower frame body in a thermal power plant, which includes a coal mill body, a frame body arranged at the lower end of the coal mill body, a main shaft arranged in the middle of the frame body, a plurality of ring groove frames installed on the frame body, a plurality of ring grooves arranged at intervals on the ring groove frames, at least one side of the ring groove being an inclined surface, a plurality of fan-shaped mounting frames arranged at the corresponding positions of the ring grooves on the main shaft to form a ring-shaped mounting ring, a base plate installed on the mounting ring, a graphite layer arranged on the base plate, and the graphite layer being in close contact with the inclined surface of the ring groove.

[0007] By adopting the technical scheme, the ring groove with a straight-angled trapezoidal section is arranged, a plurality of ring grooves are tooth-shaped from top to bottom, a plurality of mounting racks with a fan-shaped structure are arranged in a ring shape, and the mounting racks are fixed on the main shaft; the flexible substrate graphite sheet is arranged on the mounting rack in a ring shape; the graphite sheet is pressed by the ring-shaped air bag, one side of the ring-shaped graphite sheet with graphite is in contact with the inclined surface of the ring groove, and the coal powder cannot pass through the sealing assembly when the main shaft rotates, thereby achieving a good sealing effect.

[0008] The mounting rack is further provided with an arc-shaped air bag ring frame, a plurality of air bag rings are arranged in the air bag ring frame, and the air bag ring abuts against the substrate.

[0009] By adopting the technical scheme, the air bag ring makes the graphite layer on the substrate tightly adhere to the inclined surface of the ring groove.

[0010] The substrate is a flexible substrate, a hydraulic jacking column is arranged at the upper end of the air bag ring frame in each mounting rack, and the top end of the hydraulic jacking column is in contact with the bottom end of the substrate.

[0011] By adopting the technical scheme, the substrate can be jacked up by the hydraulic jacking column.

[0012] The lower end of the ring groove frame and the rack are further provided with a plurality of gasket rings.

[0013] By adopting the technical scheme, the ring groove frame can be stably fixed on the rack by the plurality of gasket rings.

[0014] The air bag ring is further provided with anti-slip lines uniformly and at intervals.

[0015] By adopting the technical scheme, the relative sliding between the air bag ring and the substrate is prevented.

[0016] The bottom end of the mounting rack is provided with an opening.

[0017] By adopting the technical scheme, the opening ensures that the hydraulic pipeline and the air pressure pipeline can be smoothly connected to respective rotary joints downward.

[0018] The air bag ring is connected with a rotary joint through the air pressure pipeline and passing through the bottom end of at least one group of openings.

[0019] By adopting the technical scheme, the air pressure pipeline can maintain the air pressure in the corresponding air bag ring.

[0020] A plurality of hydraulic jacking columns are further provided with a hydraulic ring at the bottom end through a pipeline, the hydraulic ring is connected with a rotary joint at the bottom end of the rack through a hydraulic pipeline and passing through at least one group of openings.

[0021] By adopting the technical scheme, the hydraulic oil is provided for the multiple sets of hydraulic jacking columns through the hydraulic ring to make the multiple sets of hydraulic jacking columns rise or fall.

[0022] The application is further provided that the multiple sets of the fan-shaped mounting frames are arranged in a ring structure through the tension spring and are stably fixed at the corresponding positions of the ring grooves.

[0023] By adopting the technical scheme, the multiple sets of mounting frames can be arranged in a ring structure.

[0024] The application is further provided that the graphite layer is not in full contact with the inclined surface of the ring groove.

[0025] By adopting the technical scheme, the graphite layer has spare graphite, and the service life of the graphite layer is prolonged.

[0026] In summary, the application mainly has the following beneficial effects:

[0027] 1. The application arranges the ring groove with a straight-angle trapezoidal section, arranges the multiple sets of ring grooves in a tooth-shaped part from top to bottom, arranges the multiple sets of fan-shaped mounting frames in a ring-shaped mounting ring, fixes the mounting ring on the main shaft, arranges the flexible base plate graphite sheet on the ring-shaped mounting frame, extrudes the base plate of the graphite sheet through the ring-shaped air bag, arranges the graphite side of the ring-shaped graphite sheet in contact with the inclined surface of the ring groove, and can ensure that the coal powder cannot pass through the sealing assembly when the main shaft rotates, and has a good sealing effect.

[0028] 2. The application extrudes the back of the graphite sheet through the air bag ring, arranges the graphite side of the graphite sheet in contact with the inclined surface of the ring groove, and can ensure that the graphite sheet is in contact with the inclined surface of the ring groove when the main shaft has radial runout and tilts towards one side.

[0029] 3. The application uses the flexible base plate graphite sheet, arranges the jacking structure towards the base plate of the graphite sheet on the mounting ring, the contact area of the graphite sheet in contact with the inclined surface of the ring groove through the pressure of the air bag ring is small, the remaining graphite sheet is not in contact with the inclined surface of the ring groove, the base plate of the graphite sheet is lifted upwards through the jacking mechanism after the graphite sheet in contact with the inclined surface of the ring groove is worn and thinned, the graphite not in contact with the inclined surface of the ring groove is in contact with the inclined surface of the ring groove, the replacement and maintenance period of the sealing assembly is greatly prolonged, the downtime of the coal mill is shortened, and a large amount of economic benefits is increased. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1It is the front view of the inner view of the corner sawtooth type sealing ring assembly for the existing medium-speed coal mill lower frame body of the thermal power plant;

[0031] Figure 2 It is the front view of the inner view of the installation state of the present application;

[0032] Figure 3 It is the Figure 2 Enlarged view of A;

[0033] Figure 4 It is the Figure 2 Enlarged view of B;

[0034] Figure 5 It is the radial section view of the air bag ring of the present application;

[0035] Figure 6 It is the top view of the installation ring of the present application;

[0036] Figure 7 It is the bottom view of the installation ring of the present application;

[0037] Figure 8 It is the top view of the hydraulic ring of the present application.

[0038] In the figure: 1, coal mill body; 2, frame; 3, ring groove frame; 4, mounting frame; 5, ring groove; 6, base plate; 7, graphite layer; 8, air bag ring frame; 9, air bag ring; 10, air pressure pipeline; 11, hydraulic jacking column; 12, jacking plate; 13, hydraulic ring; 14, hydraulic pipeline; 15, opening; 16, tension spring; 17, fixing screw; 18, grommet; 19, anti-skid pattern. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. The embodiments described below with reference to the drawings are exemplary and are only used for explaining the present application, and cannot be understood as a limitation of the present application.

[0040] The embodiments of the present application will be described below according to the overall structure of the present application.

[0041] A corner sawtooth type sealing ring assembly for a medium-speed coal mill lower frame body of a thermal power plant, as shown in Figures 1-8As shown, including the coal mill body 1, the rack 2 is arranged at the lower end of the coal mill body 1, the main shaft is arranged in the middle of the rack 2, a plurality of ring groove frames 3 are installed on the rack 2, a plurality of ring grooves 5 are arranged at intervals on the ring groove frame 3, the air bag ring 9 inflates to press the base plate 6, so that the graphite layer 7 on the base plate 6 is in contact with the inclined surface of the ring groove 5, and a good sealing effect is achieved when the main shaft rotates. The air bag ring 9 is supplied with air through the air pressure pipeline 10 to ensure the air pressure. The straight angle surface of the straight angle trapezoidal ring groove 5 can accommodate graphite powder generated by friction. At least one side of the ring groove 5 is an inclined surface. A plurality of fan-shaped mounting frames 4 are arranged on the main shaft at positions corresponding to the ring grooves 5 to form an annular mounting ring. The base plate 6 is fixedly installed on the mounting ring through a plurality of fixing screws 17. The base plate 6 is provided with a graphite layer 7. The graphite layer 7 is in close contact with the inclined surface of the ring groove 5. The bottom end of the mounting frame 4 is provided with an opening 15. The opening 15 ensures that the hydraulic pipeline 14 and the air pressure pipeline 10 can be smoothly connected to the respective rotating joints downward. Five groups of mounting frames 4 form a ring mounting structure and are tightly fixed on the main shaft through tension springs 16. The opening 15 of the uppermost group of mounting frames 4 is only provided with one group and is not a through hole. The number of mounting frames 4 provided with the opening 15 in the mounting ring increases from top to bottom. The mounting frames arranged in the lowermost mounting ring are all provided with the opening 15, and the opening 15 is a through hole. At least one group of openings in the opening 15 on the middle layer of the mounting ring is a non-through hole, and the remaining openings 15 are through holes. The opening 15 ensures that the hydraulic pipeline 14 and the air pressure pipeline 10 can be smoothly connected to the respective rotating joints downward.

[0042] Please refer to Figure 2 and Figure 3 , the mounting frame 4 is provided with an arc-shaped air bag ring frame 8, a plurality of air bag rings 9 are installed in the air bag ring frame 8, the air bag ring 9 abuts against the base plate 6, the air bag ring 9 makes the graphite layer 7 on the base plate 6 tightly adhere to the inclined surface of the ring groove 5, and the air pressure pipeline 10 is connected to the rotating joint through at least one group of openings 15 at the bottom end, so that the air pressure pipeline 10 can maintain the air pressure in the corresponding air bag ring 9.

[0043] Please refer to Figure 2 and Figure 3 , the base plate 6 is a flexible base plate, the hydraulic jacking column 11 is arranged at the upper end of each group of air bag ring frames 8 in the mounting frame 4, the top end of the hydraulic jacking column 11 is provided with an arc-shaped jacking plate 12, the jacking plate 12 with an arc-shaped top end is in contact with the bottom end of the base plate 6, the base plate 6 can be jacked up through the hydraulic jacking column 11, the jacking plate 12 with an arc-shaped top end can prevent the base plate 6 from being torn during the jacking process, the bottom end of each group of hydraulic jacking columns 11 is connected to the hydraulic ring 13 through a pipeline, the hydraulic ring 13 is connected to the rotating joint at the bottom end of the rack 2 through the hydraulic pipeline 14 passing through at least one group of openings 15, and the hydraulic ring 13 provides hydraulic oil for the plurality of hydraulic jacking columns 11 to make them rise or fall.

[0044] Please refer toFigure 2 And Figure 6 In order to make the ring groove frame 3 stable and fixed on the frame 2 by the multiple sets of gaskets 18, the lower end of the ring groove frame 3 is provided with the multiple sets of gaskets 18 between the frame 2, and the multiple sets of fan-shaped mounting frames 4 are stably fixed on the corresponding positions of the ring groove 5 by the tension springs 16, so that the multiple sets of mounting frames 4 can form the mounting ring with the ring structure.

[0045] Please refer to Figure 5 In order to prevent the relative sliding between the air bag ring 9 and the base plate 6, the anti-skid lines 19 are uniformly and spacedly arranged on the air bag ring 9.

[0046] Please refer to Figure 3 The graphite layer 7 is not in complete contact with the inclined surface of the ring groove 5, so that the graphite layer 7 has spare graphite, and the service life of the graphite layer 7 is prolonged.

[0047] The working principle of the present application is that the air bag ring 9 is inflated to press the base plate 6, so that the graphite layer 7 on the base plate 6 is in contact with the inclined surface of the ring groove 5, and plays a good sealing effect when the main shaft rotates. The air bag ring 9 is supplied with air through the air pressure pipeline 10 to ensure the air pressure. The straight angle surface of the ring groove 5 with the straight angle trapezoidal shape can accommodate the graphite powder generated by friction. The five sets of mounting frames 4 form the ring structure and are tightly fixed on the main shaft through the tension springs 16. The opening 15 of the uppermost set of mounting frames 4 is only provided with one set of openings, and is not a through hole. The number of the mounting frames 4 provided with the openings 15 in the mounting ring increases from top to bottom. The mounting frames provided in the lowermost mounting ring are all provided with the openings 15, and the openings 15 are all through holes. The openings 15 ensure that the hydraulic pipeline 14 and the air pressure pipeline 10 can be smoothly connected to the respective rotating joints.

[0048] Although the embodiments of the present application have been shown and described, the specific embodiments are only an explanation of the present application, and are not a limitation of the application. The specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner, and those skilled in the art can make modifications, replacements and variations of the embodiments without creative contribution after reading the specification, as long as they are within the scope of the claims of the present application.

Claims

1. A sawtooth-type sealing ring assembly for the lower frame of a medium-speed coal mill in a thermal power plant, comprising a coal mill body (1), a frame (2) disposed at the lower end of the coal mill body (1), and a main shaft disposed in the middle of the frame (2), characterized in that: Multiple sets of annular groove frames (3) are installed on the frame (2). Multiple sets of annular grooves (5) are spaced apart on the annular groove frames (3). At least one side of each annular groove (5) is inclined. Multiple sets of fan-shaped mounting frames (4) are spliced ​​together to form annular mounting rings on the main shaft at corresponding positions of the annular grooves (5). A substrate (6) is installed on the mounting ring. A graphite layer (7) is provided on the substrate (6). The graphite layer (7) is in close contact with the inclined surface of the annular groove (5). An arc-shaped airbag ring frame (8) is provided on the mounting frame (4). An airbag ring (9) is installed in each of the multiple sets of airbag ring frames (8). The airbag ring (9) abuts against the substrate (6). The substrate (6) is a flexible substrate. Hydraulic lifting columns (11) are installed on the upper end of the airbag ring frame (8) in the mounting frame (4). The top of the hydraulic lifting column (11) is in contact with the bottom end of the base plate (6). The cross-section of the ring groove (5) is a right trapezoid. Multiple sets of ring grooves (5) are distributed in a toothed shape from top to bottom, forming an angular sawtooth structure. The bottom ends of multiple sets of hydraulic lifting columns (11) are connected to hydraulic rings (13) through pipes. The hydraulic rings (13) pass through at least one set of openings (15) through hydraulic pipelines (14) and are connected to a rotary joint at the bottom end of the frame (2). Multiple sets of fan-shaped mounting frames (4) form a ring structure through tension springs (16) and are stably fixed at the corresponding position of the ring groove (5).

2. The angular sawtooth sealing ring assembly for the lower frame of a medium-speed coal mill in a thermal power plant according to claim 1, characterized in that: Multiple sets of gaskets (18) are provided between the lower end of the ring groove frame (3) and the frame (2).

3. The angular sawtooth sealing ring assembly for the lower frame of a medium-speed coal mill in a thermal power plant according to claim 1, characterized in that: The airbag ring (9) is provided with anti-slip textures (19) at even intervals.

4. The angular sawtooth sealing ring assembly for the lower frame of a medium-speed coal mill in a thermal power plant according to claim 1, characterized in that: The mounting bracket (4) has an opening (15) at its bottom end.

5. The angular sawtooth sealing ring assembly for the lower frame of a medium-speed coal mill in a thermal power plant according to claim 1, characterized in that: The airbag ring (9) is connected to a rotary joint at the bottom end through an air pressure pipeline (10) passing through at least one set of openings (15).

6. The angular sawtooth sealing ring assembly for the lower frame of a medium-speed coal mill in a thermal power plant according to claim 1, characterized in that: The graphite layer (7) is not in complete contact with the inclined surface of the annular groove (5).

Images