Novel coal mill base sealing structure

Abstract

The utility model discloses a novel coal mill base sealing structure which comprises a base body, a main shaft, a sealing piece, a mounting plate and an adjusting structure, the adjusting structure is arranged, a push plate is pushed, then a clamping block is contained in a movable groove, limiting on a movable plate is relieved, then the movable plate can be separated from a sliding plate, and the sealing piece is arranged on the base body. Therefore, the mounting plate and the sealing piece are conveniently taken down, the effect of conveniently replacing the sealing piece is achieved, the problems of air leakage and powder leakage caused by gaps generated by abrasion are avoided, the sealing piece is designed in an elastic lip shape, then the self-compensation effect is achieved, the position and the shape of the sealing piece can still be automatically adjusted after the sealing piece is abraded, the sealing effect is kept, and the service life of the sealing piece is prolonged. And the sealing element is made by compounding metal and polymer, so that the anti-aging and wear-resistant properties of the sealing element are improved.

Description

Technical Field

[0001] This utility model relates to the field of coal mills, and in particular to a novel coal mill base sealing structure. Background Technology

[0002] In some power plants, due to long-term wear of the base, there is a significant leakage of sealing air during the operation of the coal mill. The leaked sealing air carries a certain amount of coal ash, which pollutes the environment in the carbon ring area. The air and powder leakage problems can lead to pressure imbalance inside the coal mill, affecting the uniform delivery of coal powder and combustion efficiency.

[0003] CN221443305U discloses a "Novel Sealing Structure for a Medium-Speed ​​Coal Mill Base," comprising a primary air chamber within the base; fixed metal brush seals located on the outer sides of the housing at both ends of the primary air chamber, with the tops of the fixed metal brush seals contacting the transmission disc; movable metal brush seals located on the housing, with the tops of the movable metal brush seals contacting the transmission disc and moving synchronously with the transmission disc; a steel plate at the bottom of the primary air chamber, with a carbon crystal ring installed on the bottom surface of the steel plate; and a high-temperature resistant, high-elasticity rubber sealing ring located outside the carbon crystal ring. The addition of fixed and movable metal brush seals ensures that during periods of high coal content, coal and gravel do not enter the base seal and damage it. The addition of the high-temperature resistant, high-elasticity rubber sealing ring also prevents hot air leakage and avoids frequent replacement of the carbon crystal ring during coal mill decommissioning.

[0004] Although the aforementioned novel medium-speed coal mill base sealing structure has certain advantages in sealing capability, the aging and wear resistance of the seals is not outstanding. In long-term operation, the seals are prone to gaps due to wear, leading to air and dust leakage, thus requiring regular inspection and replacement of worn seals. Utility Model Content

[0005] Therefore, in order to overcome the above-mentioned shortcomings, this utility model provides a novel coal mill base sealing structure.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a novel coal mill base sealing structure, comprising a base body, a main shaft, a sealing element, a mounting plate, and an adjustment structure. The main shaft is located in the middle of the base body, and a sealing element is fitted onto the lower side of the main shaft. The lower end face of the sealing element is in contact with the mounting plate, and the upper end face of the sealing element is in contact with the adjustment structure. The adjustment structure includes a sealing plate, a rectangular groove, a movable plate, a first spring, a mounting structure, a toothed plate, and a limiting structure. A rectangular groove is provided on the left side of the sealing plate, and the rectangular grooves are arranged in an array around the main shaft. Movable plates are installed inside each rectangular groove. The lower end face of each movable plate is elastically connected to the inner wall of the rectangular groove via the first spring. The middle of the movable plate is penetrated by the mounting structure. One end of the movable plate slides against the inner wall of the rectangular groove, and the other end of the movable plate is installed and connected to one side of the toothed plate. A limiting structure is provided on the other side of the toothed plate. The sealing plate is fitted onto the outside of the main shaft, and the upper end face of the sealing plate is installed and connected to the base body.

[0007] Optionally, the installation structure includes a sliding plate, a fastening block, a movable groove, a second spring, a limiting plate, a locking block, a moving groove, and a push plate. The fastening block is installed on the lower end face of the sliding plate, and a movable groove is formed on the upper side of the middle part of the sliding plate. A second spring is installed inside the movable groove, and the left and right ends of the second spring are respectively attached to one side of the limiting plate. A locking block is installed on the other side of the limiting plate, and the locking block extends out of the sliding plate. A moving groove is formed in the middle part of both the sliding plate and the fastening block. Push plates are provided on the left and right sides inside the moving groove, and the upper ends of the push plates are respectively installed and connected to the limiting plate. The upper side of the sliding plate passes through the movable plate, and the lower end face of the locking block is attached to the movable plate.

[0008] Optionally, the limiting structure includes a ratchet, a pawl, a limiting shaft, a first circular block, a tension spring, a second circular block, and a mounting block. The ratchet has a pawl on its lower left side, and the left side of the pawl is fitted onto the outer wall of the limiting shaft. The front and rear ends of the limiting shaft are rotatably connected to the inner wall of the rectangular groove through bearings. The first circular block is mounted on the right side of the pawl. The first circular block is connected to the second circular block through a tension spring. The second circular block is mounted to the mounting block, and the mounting block is mounted to the inner wall of the rectangular groove.

[0009] Optionally, a handle is installed on the lower end face of the toothed plate, and the lower side of the handle extends out of the sealing plate.

[0010] Optionally, a sliding groove is provided on the left side of the front end face of the sealing plate, and the sliding grooves are arranged in an array with the main axis as the center.

[0011] Optionally, the outer wall of the card block is inclined.

[0012] Optionally, the ratchet and the toothed plate are engaged.

[0013] The beneficial effects of this utility model are:

[0014] This utility model is a novel sealing structure for a coal mill base. By incorporating an adjustment structure, the push plate is pushed to retract the locking block into the movable slot, releasing the restriction on the movable plate. This allows the movable plate to be separated from the sliding plate, facilitating the removal of the mounting plate and the seal. This facilitates the replacement of the seal and prevents wear-induced gaps that could lead to air or powder leakage. The seal features an elastic lip design, achieving a self-compensating effect. Even after wear, the seal automatically adjusts its position and shape to maintain a tight seal. Furthermore, the seal is made of a composite of metal and polymer, enhancing its anti-aging and wear-resistance properties. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is the structure of the utility model Figure 1 A magnified view of part A;

[0017] Figure 3 This is a schematic diagram of the adjustment structure of this utility model;

[0018] Figure 4 This is a schematic diagram of the installation structure of this utility model;

[0019] Figure 5 This is a schematic diagram of the limiting structure of this utility model.

[0020] The components include: base body-1, main shaft-2, seal-3, mounting plate-4, adjustment structure-5, sealing plate-51, rectangular groove-52, movable plate-53, first spring-54, mounting structure-55, toothed plate-56, limiting structure-57, handle-58, sliding groove-59, sliding plate-551, fastening block-552, movable groove-553, second spring-554, limiting plate-555, locking block-556, moving groove-557, push plate-558, ratchet-571, pawl-572, limiting shaft-573, first round block-574, tension spring-575, second round block-576, and mounting block-577. Detailed Implementation

[0021] To further explain the technical solution of this utility model, a detailed description is provided below through specific embodiments.

[0022] Please see Figure 1-3This utility model provides a novel sealing structure for a coal mill base, including a base body 1, a main shaft 2, a sealing element 3, a mounting plate 4, and an adjustment structure 5. The main shaft 2 is located in the middle of the base body 1, and the sealing element 3 is fitted onto the lower side of the main shaft 2. The lower end face of the sealing element 3 is in contact with the mounting plate 4, and the upper end face of the sealing element 3 is in contact with the adjustment structure 5. The adjustment structure 5 includes a sealing plate 51, a rectangular groove 52, a movable plate 53, a first spring 54, a mounting structure 55, a toothed plate 56, and a limiting structure 57. A rectangular groove is formed on the left side of the sealing plate 51. 52. Rectangular grooves 52 are arranged in an array around the main shaft 2, and each rectangular groove 52 is equipped with a movable plate 53. The lower end face of the movable plate 53 is elastically connected to the inner wall of the rectangular groove 52 by a first spring 54. The middle of the movable plate 53 is penetrated by the mounting structure 55. One end of the movable plate 53 is slidably engaged with the inner wall of the rectangular groove 52, and the other end of the movable plate 53 is installed and connected to one side of the toothed plate 56. The other side of the toothed plate 56 is provided with a limit structure 57. The sealing plate 51 is sleeved on the outside of the main shaft 2, and the sealing plate 51... The upper end face of the toothed plate 56 is connected to the base body 1. A handle 58 is installed on the lower end face of the toothed plate 56, and the lower side of the handle 58 extends out of the sealing plate 51, which facilitates the downward movement of the toothed plate 56 by pulling down the handle 58. A sliding groove 59 is provided on the left side of the front end face of the sealing plate 51, and the sliding grooves 59 are arranged in an array with the main shaft 2 as the center. The first circular block 574 extends out of the sealing plate 51, and the first circular block 754 slides along the inner wall of the sliding groove 59, which is conducive to driving the pawl 572 to move, thereby releasing the restriction on the ratchet 571. The seal 3 is made of a composite of metal (such as stainless steel or alloy steel) and polymer (such as fluororubber or silicone rubber). The seal 3 adopts an elastic lip design. When the spindle 2 rotates, the elastic lip will deform due to the rotation of the spindle 2, generating additional sealing force. The elastic deformation capability of the lip allows it to adapt to the eccentricity, vibration and surface roughness changes of the shaft, and always maintain good sealing contact. After wear, the elastic lip can automatically adjust its shape and position by relying on its own elastic deformation capability to compensate for wear gaps and maintain sealing effect.

[0023] Please see Figure 4This utility model provides a novel sealing structure for a coal mill base. The mounting structure 55 includes a sliding plate 551, a fastening block 552, a movable groove 553, a second spring 554, a limiting plate 555, a locking block 556, a moving groove 557, and a push plate 558. The fastening block 552 is installed on the lower end face of the sliding plate 551. A movable groove 553 is opened on the upper side of the middle part of the sliding plate 551. The second spring 554 is installed inside the movable groove 553. The left and right ends of the second spring 554 are respectively attached to one side of the limiting plate 555, and the other side of the limiting plate 555 is... A locking block 556 is installed, and the locking block 556 extends out of the sliding plate 551. The sliding plate 551 and the fastening block 552 are both provided with a moving groove 557 in the middle. Push plates 558 are provided on the left and right sides inside the moving groove 557, and the upper ends of the push plates 558 are respectively connected to the limiting plate 555. The upper side of the sliding plate 551 passes through the movable plate 53. The lower end face of the locking block 556 is in contact with the movable plate 53. The outer side wall of the locking block 556 is inclined, so that the elasticity of the second spring 554 can be used to quickly install the locking block 556 and the movable plate 53.

[0024] Please see Figure 5 This utility model provides a novel sealing structure for a coal mill base. The limiting structure 57 includes a ratchet 571, a pawl 572, a limiting shaft 573, a first circular block 574, a tension spring 575, a second circular block 576, and a mounting block 577. The ratchet 571 has a pawl 572 on its lower left side. The left side of the pawl 572 is fitted onto the outer wall of the limiting shaft 573, and the front and rear ends of the limiting shaft 573 are rotatably connected to the inner wall of the rectangular groove 52 through bearings. The first circular block 574 is installed on the right side of the pawl 572. The first circular block 574 is connected to the second circular block 576 through the tension spring 575. The second circular block 576 is installed and connected to the mounting block 577. The mounting block 577 is installed and connected to the inner wall of the rectangular groove 52. The ratchet 571 and the toothed plate 56 are meshed, which facilitates the rotation of the ratchet 571 by the toothed plate 56.

[0025] The working principle is as follows:

[0026] First, the new structure is installed on the required coal mill base. After the seal 3 wears, the elastic lip design provides self-compensation to maintain the sealing effect. The elasticity of the first spring 54 drives the movable plate 53 to move upward. The movable plate 53 drives the installation structure 55 to move. At the same time, the movable plate 53 drives the toothed plate 56 to move upward. The toothed plate 56 drives the ratchet 571 to rotate. The tension of the tension spring 575 drives the pawl 572 to limit the ratchet 571, so that the ratchet 571 rotates in one direction. Then, the fastening block 552 keeps the seal 3 tight, effectively reducing the problem of air and powder leakage.

[0027] Second, by pushing the push plate 558, the push plates 558 move closer to each other, so that the push plate 558 drives the locking block 556 to move through the limiting plate 555. The locking block 556 is inserted into the inner wall of the movable groove 553, thereby releasing the limitation on the movable plate 53. At this time, the mounting structure 55 can be moved downward as a whole, so that the mounting structure 55 can be removed, and the mounting plate 4 and the seal 3 can be taken out downward without tightening the screws, thus achieving the effect of facilitating the replacement of the seal 3.

[0028] Third, due to the elasticity of the first spring 54, during installation, by first pushing the first round block 574, the first round block 574 slides along the inner wall of the sliding groove 59, and the first round block 574 drives the pawl 572 to rotate around the limiting shaft 573, while stretching the tension spring 575, releasing the limit on the ratchet 571. After pulling down the handle 58, the toothed plate 56 moves downward, driving the movable plate 53 to move downward, thus allowing the installation structure to pass through the mounting plate 4 and the sealing plate 51. Utilizing the elasticity of the second spring 554, the locking block 556 engages with the movable plate 53. During the installation process, the operating procedures must be strictly followed to ensure that each step of the operation meets the standards, avoiding problems such as uneven sealing surfaces and insufficient tightening torque. Through efficient and practical sealing design, the reliability, durability, and adaptability of the seal are satisfied as much as possible. The performance of the sealing element 3 is evaluated regularly, and the degraded sealing element 3 is promptly identified and replaced to ensure sealing performance.

[0029] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A novel coal mill base sealing structure, comprising a base body (1), a main shaft (2), a sealing element (3) and a mounting plate (4), wherein the main shaft (2) is provided in the middle of the base body (1), and the sealing element (3) is fitted on the lower side of the main shaft (2), and the lower end face of the sealing element (3) is in contact with the mounting plate (4); Its features are: It also includes an adjustment structure (5), the upper end face of the sealing element (3) is in contact with the adjustment structure (5), the adjustment structure (5) includes a sealing plate (51), a rectangular groove (52), a movable plate (53), a first spring (54), a mounting structure (55), a toothed plate (56) and a limiting structure (57), the sealing plate (51) has a rectangular groove (52) on its left side, the rectangular grooves (52) are arranged in an array with the main shaft (2) as the center, and the movable plate (53) is provided inside the rectangular grooves (52). The lower end face is elastically connected to the inner wall of the rectangular groove (52) by the first spring (54). The middle part of the movable plate (53) is penetrated by the mounting structure (55). One end of the movable plate (53) is slidably engaged with the inner wall of the rectangular groove (52), and the other end of the movable plate (53) is installed and connected to one side of the toothed plate (56). A limit structure (57) is provided on the other side of the toothed plate (56). The sealing plate (51) is sleeved on the outside of the main shaft (2), and the upper end face of the sealing plate (51) is installed and connected to the base body (1).

2. The novel coal mill base sealing structure according to claim 1, characterized in that: The mounting structure (55) includes a sliding plate (551), a fastening block (552), a movable groove (553), a second spring (554), a limiting plate (555), a locking block (556), a moving groove (557), and a push plate (558). The fastening block (552) is installed on the lower end face of the sliding plate (551). A movable groove (553) is opened on the upper side of the middle part of the sliding plate (551). The second spring (554) is arranged inside the movable groove (553). The left and right ends of the second spring (554) are respectively connected to the limiting plate (555). The sliding plate (551) is attached to one side of the limiting plate (555), and the other side of the limiting plate (555) is equipped with a locking block (556). The locking block (556) extends out of the sliding plate (551). The middle part of the sliding plate (551) and the fastening block (552) is provided with a moving groove (557). The left and right sides of the moving groove (557) are provided with push plates (558). The upper end of the push plate (558) is respectively connected to the limiting plate (555). The upper side of the sliding plate (551) passes through the movable plate (53), and the lower end of the locking block (556) is attached to the movable plate (53).

3. The novel coal mill base sealing structure according to claim 1, characterized in that: The limiting structure (57) includes a ratchet (571), a pawl (572), a limiting shaft (573), a first circular block (574), a tension spring (575), a second circular block (576), and a mounting block (577). The ratchet (571) has a pawl (572) on its lower left side. The left side of the pawl (572) is fitted onto the outer wall of the limiting shaft (573), and the front and rear ends of the limiting shaft (573) are rotatably connected to the inner wall of the rectangular groove (52) through bearings. The right side of the pawl (572) has a first circular block (574) installed. The first circular block (574) is connected to the second circular block (576) by tension through the tension spring (575). The second circular block (576) is installed and connected to the mounting block (577), and the mounting block (577) is installed and connected to the inner wall of the rectangular groove (52).

4. The novel coal mill base sealing structure according to claim 1, characterized in that: A handle (58) is installed on the lower end face of the toothed plate (56), and the lower side of the handle (58) extends out of the sealing plate (51).

5. The novel coal mill base sealing structure according to claim 1, characterized in that: The sealing plate (51) has a sliding groove (59) on the left side of its front end face, and the sliding groove (59) is arranged in an array with the main shaft (2) as the center.

6. The novel coal mill base sealing structure according to claim 2, characterized in that: The outer wall of the card block (556) is inclined.

7. The novel coal mill base sealing structure according to claim 3, characterized in that: The ratchet (571) and the toothed plate (56) are engaged.

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