Floating type pull rod sealing assembly structure of coal mill
By designing a combination of floating-type sealing copper ring and carbon pack and immersed antimony graphite carbon precision ring in a coal mill, the problem of degradation of sealing properties caused by friction and wear of the tie rod sealing assembly is solved, and the sealing performance is improved and air leakage is achieved. Prevent powder leakage.
Patent Information
- Application Number
- CN202421091594.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-20
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2034-05-20
AI Technical Summary
During the operation, the friction between the metal conical sleeve and the tie rod sealing assembly of the coal mill is worn, resulting in a decrease in sealing performance and leakage of air and powder. After the existing rubber sealing core is worn, the spring cannot be effectively held tightly, and the sealing effect is not good.
The floating type upper sealed copper ring and carbon pack are combined with the immersed antimony graphite carbon precision ring. The floating copper ring reduces the wear of the tie rod, and the step-type cutout design allows the sealing ring to automatically tighten after wear to prevent air and powder leakage.
It effectively reduces the wear of the tie rod and the wear of the sealing core, improves the sealing performance, ensures the stability and durability of the sealing effect, and prevents air and powder leakage.
Smart Images
Figure CN222334494U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of tie rod seals for coal mills, and in particular relates to a floating tie rod seal component structure for coal mills. Background Art
[0002] At present, the seal on the tie rod is composed of a metal conical sleeve and a cover plate. During the operation of the coal mill, the tie rod will shake frequently, and the metal conical sleeve and the tie rod will frequently collide and rub against each other, causing wear of the tie rod and the conical sleeve, and the gap becomes larger, resulting in the original wind pressure cannot be guaranteed, thereby leaking air and powder to pollute the environment.
[0003] The seal under the tie rod is a packing seal, which is made of soft material and has a short service life due to frequent friction during use. The metal shell of the sealing core directly rubs against the sealing cover, and the sealing performance is poor after the contact surface is worn, affecting the sealing effect.
[0004] In the prior art, three rubber seals are designed in the lower seal of the tie rod, and the upper and lower contact surfaces of the sealing shell are sealed with sealing rings. The rubber sealing core has a good sealing effect when it is first used, but it is easy to wear due to long-term contact and friction. Although it is designed with spring fastening, the spring force cannot hold the tie rod tightly after wear, and the contraction effect cannot be achieved. The material and form of the sealing rings on the upper and lower end surfaces of the sealing shell are unknown. The sealing performance is achieved, but it is uncertain whether it is wear-resistant.
[0005] Therefore, how to design the tie rod seal assembly to solve the problem of collision and friction between the metal seal and the tie rod has become a problem that needs to be solved. Summary of the invention
[0006] To this end, the utility model provides a floating rod seal assembly structure for a coal mill, in which the most critical upper sealing copper ring is designed to be floating. During the operation of the coal mill, the rod swings up and down with a small amplitude, and when the amplitude of the left and right swing is large, rubber and another copper ring are used as guides to reduce the wear on the rod. The floating amount can be adjusted according to the on-site coal quality conditions.
[0007] The packing seal core in the lower tie rod seal is designed as a combination of carbon packing, antimony-impregnated graphite carbon ring and copper ring, which effectively reduces the wear of the seal core. In addition, the cuts of the antimony-impregnated graphite carbon ring and the copper ring are designed as step-type, which automatically tightens after wear and can prevent air and powder leakage from the cut seam.
[0008] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a floating rod seal assembly structure of a coal mill, comprising: an upper seal assembly and a lower seal assembly;
[0009] The upper sealing assembly is provided with a slider, and an upper sealing bottom plate is provided at the bottom of the slider; a sealing cover plate is provided above the upper sealing bottom plate, and the sealing cover plate is arranged on the outer side of the bottom of the slider and is screwed to the upper sealing bottom plate by bolts.
[0010] As a preferred structural scheme for a floating rod seal assembly of a coal mill, a second flange cover plate is provided above the sealing cover plate, and a first flange cover plate is provided above the second flange cover plate; the inner sides of the first flange cover plate and the second flange cover plate are both connected to the slider; the first flange cover plate and the second flange cover plate are screwed to the sealing cover plate by bolts.
[0011] As a preferred structural solution for a floating rod seal assembly of a coal mill, an upper shell is provided on the outer side of the upper part of the slider, a first upper sealing copper ring is provided on the inner side of the upper end of the upper shell, the inner side of the first upper sealing copper ring is in close contact with the rod; a first spring ring is provided on the outer side of the first upper sealing copper ring.
[0012] As a preferred structural solution for a floating rod seal assembly of a coal mill, a second upper sealing copper ring is also provided on the upper part of the slider, and the inner side of the second upper sealing copper ring is in close contact with the rod; a second spring ring and a third spring ring are provided on the outer side of the second upper sealing copper ring.
[0013] As a preferred structural solution for a floating rod seal assembly for a coal mill, a first rubber sealing core and a second rubber sealing core are further provided at the lower portion of the slider; the inner sides of the first rubber sealing core and the second rubber sealing core are both in close contact with the rod.
[0014] As a preferred structural solution for a floating rod seal assembly of a coal mill, the lower seal assembly is provided with a lower seal bottom plate, an outer sleeve and an inner sleeve are provided above the lower seal bottom plate; the inner sleeve is arranged inside the outer sleeve.
[0015] As a preferred structural solution of a floating rod seal assembly for a coal mill, a first O-ring is provided at the upper end of the inner sleeve, and a first wear-resistant pad is provided above the first O-ring; the upper end of the first wear-resistant pad is connected to the inner side of the outer sleeve;
[0016] A second O-ring is disposed at the lower end of the inner sleeve, and a second wear-resistant pad is disposed below the second O-ring; the lower end of the second wear-resistant pad is connected to the lower sealing bottom plate.
[0017] As a preferred structural solution of a floating rod seal assembly for a coal mill, a carbon packing is provided on the inner side of the upper end of the inner sleeve; a first carbon ring is provided below the carbon packing; a second carbon ring is provided below the first carbon ring; and a sealing ring is provided below the second carbon ring;
[0018] A fourth spring ring is arranged outside the first carbon ring; a fifth spring ring is arranged outside the second carbon ring; and a sixth spring ring is arranged outside the sealing ring.
[0019] The utility model has the following advantages: it comprises an upper sealing assembly and a lower sealing assembly; the upper sealing assembly is provided with a slider, and an upper sealing bottom plate is provided at the bottom of the slider; a sealing cover plate is provided above the upper sealing bottom plate, and the sealing cover plate is provided at the outer side of the bottom of the slider and is screwed to the upper sealing bottom plate by bolts. A second flange cover plate is provided above the sealing cover plate, and a first flange cover plate is provided above the second flange cover plate; the inner sides of the first flange cover plate and the second flange cover plate are both connected to the slider; the first flange cover plate and the second flange cover plate are screwed to the sealing cover plate by bolts.
[0020] The lower sealing assembly is provided with a lower sealing bottom plate, and an outer sheath and an inner sheath are provided above the lower sealing bottom plate; the inner sheath is arranged inside the outer sheath. A first O-ring is provided at the upper end of the inner sheath, and a first wear-resistant pad is provided above the first O-ring; the upper end of the first wear-resistant pad is connected to the inner side of the outer sheath;
[0021] The lower end of the inner sleeve is provided with a second O-ring, and a second wear-resistant pad is provided below the second O-ring; the lower end of the second wear-resistant pad is connected to the lower sealing bottom plate. A carbon packing is provided on the inner side of the upper end of the inner sleeve; a first carbon ring is provided below the carbon packing; a second carbon ring is provided below the first carbon ring; a sealing ring is provided below the second carbon ring; a fourth spring ring is provided outside the first carbon ring; a fifth spring ring is provided outside the second carbon ring; and a sixth spring ring is provided outside the sealing ring.
[0022] The utility model designs the most critical upper sealing copper ring as a floating type. During the operation of the coal mill, as the pull rod swings up and down slightly, when the swing amplitude is large, rubber and another copper ring are used as guides to reduce the wear on the pull rod. The floating amount can be adjusted according to the coal quality conditions on site. The packing sealing core in the lower pull rod seal is designed as a combination of carbon packing, antimony-impregnated graphite carbon ring and copper ring, which effectively reduces the wear of the sealing core. In addition, the cuts of the antimony-impregnated graphite carbon ring and the copper ring are designed as step-type, which automatically tighten after wear and can prevent air leakage and powder leakage from the cut seam. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.
[0024] Figure 1 It is a cross-sectional schematic diagram of an upper sealing assembly in a floating rod sealing assembly structure of a coal mill provided in an embodiment of the utility model;
[0025] Figure 2 It is a cross-sectional schematic diagram of a lower sealing component in a floating rod sealing component structure of a coal mill provided in an embodiment of the utility model;
[0026] Figure 3 A schematic diagram of a carbon ring in a floating rod seal assembly structure of a coal mill provided in an embodiment of the utility model;
[0027] Figure 4 It is a schematic diagram of an upper sealing copper ring in a floating rod seal assembly structure of a coal mill provided in an embodiment of the utility model.
[0028] In the figure, 1, upper shell; 2, first upper sealing copper ring; 3, second upper sealing copper ring; 4, slider; 5, first rubber sealing core; 6, second rubber sealing core; 7, first flange cover plate; 8, second flange cover plate; 9, sealing cover plate; 10, upper sealing bottom plate; 11, first spring ring; 12, second spring ring; 13, third spring ring; 14, outer sheath; 15, first O-ring; 16, first wear-resistant pad; 17, inner sheath; 18, carbon packing; 19, first carbon ring; 20, second carbon ring; 21, sealing ring; 22, fourth spring ring; 23, fifth spring ring; 24, sixth spring ring; 25, second O-ring; 26, second wear-resistant pad; 27, lower sealing bottom plate. DETAILED DESCRIPTION
[0029] The following is a specific embodiment of the present invention. People familiar with the technology can easily understand the other advantages and functions of the present invention from the contents disclosed in this specification. Obviously, the described embodiment is a part of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0030] See also Figure 1 and Figure 2 , the utility model embodiment provides a coal mill floating type tie rod seal assembly structure, including: an upper seal assembly and a lower seal assembly;
[0031] The upper sealing assembly is provided with a slider 4, and an upper sealing bottom plate 10 is provided at the bottom of the slider 4; a sealing cover plate 9 is provided above the upper sealing bottom plate 10, and the sealing cover plate 9 is arranged on the outer side of the bottom of the slider 4 and is screwed to the upper sealing bottom plate 10 by bolts.
[0032] There is a gap between the upper end of the sealing cover plate 9 and the bottom boss of the slider 4 , and there is also a gap between the bottom side of the slider 4 and the inner side of the sealing cover plate 9 .
[0033] In this embodiment, a second flange cover plate 8 is provided above the sealing cover plate 9, and a first flange cover plate 7 is provided above the second flange cover plate 8; the inner sides of the first flange cover plate 7 and the second flange cover plate 8 are both connected to the slider 4; the first flange cover plate 7 and the second flange cover plate 8 are screwed to the sealing cover plate 9 by bolts.
[0034] Specifically, the sealing cover plate 9 is a quadrilateral, the first flange cover plate 7 and the second flange cover plate 8 are circular, designed as a floating type, the inner side is close to the pull rod, and is always in contact with the sealing cover plate 9, which greatly reduces the possibility of dust entering. The whole is made into a split type, which is convenient for installation and replacement during maintenance.
[0035] In this embodiment, an upper shell 1 is provided on the outer side of the upper part of the slider 4, and a first upper sealing copper ring 2 is provided on the inner side of the upper end of the upper shell 1. The inner side of the first upper sealing copper ring 2 is closely connected to the pull rod; and a first spring ring 11 is provided on the outer side of the first upper sealing copper ring 2.
[0036] Specifically, the first upper sealing copper ring 2 is a two-piece type, fixed from the outside by the first spring ring 11, and there is a gap between the first upper sealing copper ring 2 and the pull rod, and the dust is blown away by the internal sealing wind to prevent dust from entering the pull rod seal.
[0037] In this embodiment, a second upper sealing copper ring 3 is further provided on the upper portion of the slider 4 , and the inner side of the second upper sealing copper ring 3 is in close contact with the pull rod; a second spring ring 12 and a third spring ring 13 are provided on the outer side of the second upper sealing copper ring 3 .
[0038] Specifically, the second upper sealing copper ring 3 is also a two-body type, fixed from the outside by the second spring ring 12 and the third spring ring 13, so that the second upper sealing copper ring 3 and the pull rod are tightly held. When the pull rod shakes up and down slightly, the second upper sealing copper ring 3 will float up and down with the pull rod, reducing the mutual friction between the copper ring and the pull rod. When the pull rod shakes and floats greatly, the copper ring will only generate friction with the pull rod when it hits the upper and lower end surfaces. The floating amount of the second upper sealing copper ring 3 can be adjusted according to the coal quality conditions on site.
[0039] In this embodiment, a first rubber sealing core 5 and a second rubber sealing core 6 are further provided at the lower part of the sliding block 4; the inner sides of the first rubber sealing core 5 and the second rubber sealing core 6 are both in close contact with the pull rod.
[0040] Among them, the first rubber sealing core 5 and the second rubber sealing core 6 are both made of rubber material, holding the pull rod tightly to provide a guide for the second upper sealing copper ring 3. When the lateral shaking amplitude is large, the pull rod will drive the entire set of seals to shake through the rubber, reducing the mutual wear between the carbon ring and the pull rod.
[0041] In this embodiment, the lower sealing assembly is provided with a lower sealing bottom plate 27 , and an outer sheath 14 and an inner sheath 17 are provided above the lower sealing bottom plate 27 ; the inner sheath 17 is arranged inside the outer sheath 14 .
[0042] In this embodiment, a first O-ring 15 is disposed at the upper end of the inner sheath 17, and a first wear-resistant pad 16 is disposed above the first O-ring 15; the upper end of the first wear-resistant pad 16 is connected to the inner side of the outer sheath 14;
[0043] A second O-ring 25 is disposed at the lower end of the inner sleeve 17 , and a second wear-resistant pad 26 is disposed below the second O-ring 25 ; the lower end of the second wear-resistant pad 26 is connected to the lower sealing bottom plate 27 .
[0044] The first wear-resistant pad 16 and the second wear-resistant pad 26 can effectively reduce the wear between the inner sheath and the bottom plate, and reduce the risk of air leakage and powder leakage.
[0045] In this embodiment, a carbon packing 18 is provided inside the upper end of the inner sheath 17; a first carbon ring 19 is provided below the carbon packing 18; a second carbon ring 20 is provided below the first carbon ring 19; and a sealing ring 21 is provided below the second carbon ring 20.
[0046] The carbon packing 18 plays both a sealing role and a guiding role.
[0047] A fourth spring ring 22 is disposed outside the first carbon ring 19 ; a fifth spring ring 23 is disposed outside the second carbon ring 20 ; and a sixth spring ring 24 is disposed outside the sealing ring 21 .
[0048] Specifically, the first carbon ring 19 and the second carbon ring 20 are designed as two-pieces, and the outer sides are fastened by the fourth spring ring 22 and the fifth spring ring 23 respectively, and the end faces of the joints are in the form of steps or slots, such as Figure 3 and Figure 4 As shown, it can prevent air and powder leakage from the cut seam, and can also be tightened after wear. The sealing ring 21 is made of copper and is also designed in a two-body step-type form, which not only plays a supporting role, but also prevents the carbon ring from colliding with the sheath and being damaged.
[0049] In summary, the utility model includes an upper sealing component and a lower sealing component; the upper sealing component is provided with a slider 4, and an upper sealing bottom plate 10 is provided at the bottom of the slider 4; a sealing cover plate 9 is provided above the upper sealing bottom plate 10, and the sealing cover plate 9 is provided on the outer side of the bottom of the slider 4 and is screwed to the upper sealing bottom plate 10 by bolts. An upper shell 1 is provided on the outer side of the upper part of the slider 4, and a first upper sealing copper ring 2 is provided on the inner side of the upper end of the upper shell 1, and the inner side of the first upper sealing copper ring 2 is closely connected to the pull rod; a first spring ring 11 is provided on the outer side of the first upper sealing copper ring 2. A second upper sealing copper ring 3 is also provided on the upper part of the slider 4, and the inner side of the second upper sealing copper ring 3 is closely connected to the pull rod; a second spring ring 12 and a third spring ring 13 are provided on the outer side of the second upper sealing copper ring 3. A first rubber sealing core 5 and a second rubber sealing core 6 are also provided on the lower part of the slider 4; the inner sides of the first rubber sealing core 5 and the second rubber sealing core 6 are closely connected to the pull rod. The lower sealing assembly is provided with a lower sealing bottom plate 27, and an outer sleeve 14 and an inner sleeve 17 are provided above the lower sealing bottom plate 27; the inner sleeve 17 is arranged inside the outer sleeve 14. A first O-ring 15 is provided at the upper end of the inner sleeve 17, and a first wear-resistant pad 16 is provided above the first O-ring 15; the upper end of the first wear-resistant pad 16 is connected to the inner side of the outer sleeve 14; a second O-ring 25 is provided at the lower end of the inner sleeve 17, and a second wear-resistant pad 26 is provided below the second O-ring 25; the lower end of the second wear-resistant pad 26 is connected to the lower sealing bottom plate 27. A carbon packing 18 is provided inside the upper end of the inner sleeve 17; a first carbon ring 19 is provided below the carbon packing 18; a second carbon ring 20 is provided below the first carbon ring 19; a sealing ring 21 is provided below the second carbon ring 20; a fourth spring ring 22 is provided outside the first carbon ring 19; a fifth spring ring 23 is provided outside the second carbon ring 20; and a sixth spring ring 24 is provided outside the sealing ring 21. The utility model designs the most critical upper sealing copper ring as a floating type. During the operation of the coal mill, the pull rod shakes up and down with a small amplitude. When the amplitude of the left and right swing is large, rubber and another copper ring are used as guides to reduce the wear on the pull rod. The floating amount can be adjusted according to the coal quality conditions on site. The packing sealing core in the lower pull rod seal is designed as a combination of carbon packing, antimony-impregnated graphite carbon ring and copper ring, which effectively reduces the wear of the sealing core. In addition, the incisions of the antimony-impregnated graphite carbon ring and the copper ring are designed as step-type, which automatically tighten after wear and can prevent air leakage and powder leakage from the cutting seam.
[0050] Although the utility model has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the utility model. Therefore, these modifications or improvements made without departing from the spirit of the utility model are within the scope of protection claimed by the utility model.
Claims
1. A floating rod seal assembly structure for a coal mill, characterized in that: include: an upper sealing assembly and a lower sealing assembly; The upper sealing assembly is provided with a slider (4), and an upper sealing bottom plate (10) is provided at the bottom of the slider (4); a sealing cover plate (9) is provided above the upper sealing bottom plate (10), and the sealing cover plate (9) is provided on the outer side of the bottom of the slider (4) and is screwed to the upper sealing bottom plate (10) via bolts; The lower sealing assembly is provided with a lower sealing bottom plate (27), and an outer sheath (14) and an inner sheath (17) are provided above the lower sealing bottom plate (27); the inner sheath (17) is arranged inside the outer sheath (14).
2. A coal mill floating rod seal assembly structure according to claim 1, characterized in that: A second flange cover plate (8) is provided above the sealing cover plate (9), and a first flange cover plate (7) is provided above the second flange cover plate (8); the inner sides of the first flange cover plate (7) and the second flange cover plate (8) are both connected to the slider (4); and the first flange cover plate (7) and the second flange cover plate (8) are screwed to the sealing cover plate (9) by means of bolts.
3. A coal mill floating rod seal assembly structure according to claim 2, characterized in that: An upper shell (1) is provided on the outer side of the upper part of the slider (4); a first upper sealing copper ring (2) is provided on the inner side of the upper end of the upper shell (1); the inner side of the first upper sealing copper ring (2) is in close contact with the pull rod; and a first spring ring (11) is provided on the outer side of the first upper sealing copper ring (2).
4. A coal mill floating rod seal assembly structure according to claim 3, characterized in that: A second upper sealing copper ring (3) is also provided on the upper part of the sliding block (4), and the inner side of the second upper sealing copper ring (3) is in close contact with the pull rod; and a second spring ring (12) and a third spring ring (13) are provided on the outer side of the second upper sealing copper ring (3).
5. A coal mill floating rod seal assembly structure according to claim 4, characterized in that: A first rubber sealing core (5) and a second rubber sealing core (6) are also provided at the lower part of the sliding block (4); the inner sides of the first rubber sealing core (5) and the second rubber sealing core (6) are both in close contact with the pull rod.
6. A coal mill floating rod seal assembly structure according to claim 1, characterized in that: A first O-ring (15) is provided at the upper end of the inner sleeve (17), and a first wear-resistant pad (16) is provided above the first O-ring (15); the upper end of the first wear-resistant pad (16) is connected to the inner side of the outer sleeve (14); A second O-ring (25) is provided at the lower end of the inner sleeve (17), and a second wear-resistant pad (26) is provided below the second O-ring (25); the lower end of the second wear-resistant pad (26) is connected to the lower sealing bottom plate (27).
7. A coal mill floating rod seal assembly structure according to claim 6, characterized in that: A carbon packing (18) is provided on the inner side of the upper end of the inner sheath (17); a first carbon ring (19) is provided below the carbon packing (18); a second carbon ring (20) is provided below the first carbon ring (19); and a sealing ring (21) is provided below the second carbon ring (20); A fourth spring ring (22) is provided on the outside of the first carbon ring (19); a fifth spring ring (23) is provided on the outside of the second carbon ring (20); and a sixth spring ring (24) is provided on the outside of the sealing ring (21).