Pull rod suspension stacked labyrinth powder blocking sealing device of coal mill

Abstract

The utility model discloses a coal mill pull rod suspension stacked labyrinth powder blocking sealing device. The device comprises an upper powder blocking mechanism, a lower powder blocking mechanism and a lower powder blocking mechanism, wherein the upper powder blocking mechanism comprises an outer powder blocking sleeve and an inner powder blocking sleeve partially sleeved in a sleeve cavity of the outer powder blocking sleeve; the upper part of the outer powder blocking sleeve is connected with a pull rod of the coal mill, and part of the outer powder blocking sleeve can slide up and down along the outer wall of the inner powder blocking sleeve; the outer powder resisting sleeve moves up and down along with the pull rod; the lower powder blocking mechanism is located below the lower powder blocking mechanism and comprises a sealing box and a lower powder blocking assembly located in the sealing box, the lower powder blocking assembly comprises two opposite lower powder blocking sleeves, and an elastic piece is arranged between the two lower powder blocking sleeves. Through the cooperation of the upper powder blocking mechanism and the lower powder blocking mechanism, the contact area with the pull rod can be increased, the powder blocking and sealing effects are better achieved, and the pull rod is better prevented from being damaged.

Description

Technical Field

[0001] This utility model belongs to the field of coal mill sealing technology, and in particular relates to a coal mill tie rod suspension stacked labyrinth powder blocking sealing device. Background Technology

[0002] The tie rod is a crucial loading device in a coal mill, and the tie rod seal is a key sealing component, thus requiring appropriate sealing devices. However, existing tie rod sealing devices for coal mills have been found to have shortcomings in production practice, especially in positive pressure mills used in power plants. These shortcomings include: easy accumulation of pulverized coal, easily forming a pulverized coal inlet zone, poor pulverization resistance, and easy grinding between the tie rod and pulverized coal during movement, leading to damage. For example, flat plate seal structures easily accumulate pulverized coal on their upper surface; conical sleeve seal structures have pulverized coal accumulation and inlet zones; and spherical bearing seal structures also have pulverized coal accumulation zones. Therefore, it is necessary to improve existing technologies to provide better pulverization resistance, effectively preventing grinding between the tie rod and pulverized coal during movement, and thus better preventing tie rod damage. Utility Model Content

[0003] Therefore, based on the above background, this utility model improves upon the existing technology and provides a coal mill tie rod suspension stacked labyrinth powder blocking and sealing device. Through the cooperation of the upper powder blocking mechanism and the lower powder blocking mechanism, it can not only seal but also effectively block powder, preventing the coal powder from grinding with the tie rod and thus better avoiding damage to the tie rod.

[0004] The technical solution provided by this utility model is as follows:

[0005] A coal mill tie rod suspension stacked labyrinth dust-blocking sealing device includes:

[0006] Upper powder blocking mechanism: includes an outer powder blocking sleeve and an inner powder blocking sleeve partially sleeved within the cavity of the outer powder blocking sleeve; the upper part of the outer powder blocking sleeve is connected to the pull rod of the coal mill, and the outer powder blocking sleeve moves with the pull rod; a portion of the outer powder blocking sleeve can slide along the outer wall of the inner powder blocking sleeve.

[0007] Lower powder blocking mechanism: Located below the lower powder blocking mechanism, it includes a sealed box and a lower powder blocking assembly located inside the sealed box. The lower powder blocking assembly includes two opposing lower powder blocking sleeves, and an elastic element is provided between the two lower powder blocking sleeves.

[0008] One possible implementation is that the lower outer wall of the internal resistance powder sleeve is provided with an upper flange and a lower flange.

[0009] One possible implementation is that the upper part of the inner powder-resistant sleeve is provided with an upper powder-resistant end cap.

[0010] One possible implementation is that the inner resistance powder sleeve has a flexible coupling ring sleeve on the sleeve cavity wall.

[0011] One possible implementation is that the two lower powder-blocking sleeves are respectively provided with self-slip contact pieces on one side of the upper and lower box walls of the sealing box;

[0012] The lower powder-blocking sleeve has a self-slipping powder-blocking plate inside its cavity.

[0013] One possible implementation is that the elastic element is a spring or a rubber block.

[0014] One possible implementation is that the upper part of the outer powder-blocking sleeve is provided with a retaining sleeve, and the outer powder-blocking sleeve is connected to the pull rod through the retaining sleeve.

[0015] One possible implementation is that the lower cavity wall of the outer resist powder sleeve is a wedge-shaped slope.

[0016] One possible implementation is that the lower cavity wall of the inner resistance powder sleeve is a wedge-shaped slope.

[0017] One possible implementation is that the inner powder-resistant sleeve, outer powder-resistant sleeve, and lower powder-resistant sleeve are each composed of two detachable halves joined together.

[0018] The beneficial effects of adopting the above technical solution are as follows:

[0019] This invention, through the cooperation of the upper and lower powder-blocking mechanisms, can better achieve the effect of sealing and blocking powder, and can better prevent damage to the pull rod.

[0020] The outer powder-blocking sleeve of this utility model is fitted over the inner powder-blocking sleeve, and its annular plate engages with the slot on the sleeve. This can effectively block the coal powder, increasing the difficulty for the coal powder to reach the inner powder-blocking sleeve between the pull rod and the pull rod, thus creating a certain "maze" effect. This can prevent the pull rod from grinding with the coal powder during movement, thereby reducing the probability of damage to the pull rod.

[0021] The flexible coupling ring sleeve on the inner powder-blocking sleeve cavity wall and the self-slipping powder-blocking plate on the lower powder-blocking sleeve cavity wall of this utility model are seamlessly fitted with the sealing rod, which can further reduce the probability of coal powder entering. Furthermore, by utilizing the self-lubricating properties of its material, friction on the pull rod can be reduced, thereby further protecting the pull rod and preventing damage.

[0022] Furthermore, the lower cavity wall of the outer powder-resistant sleeve of this utility model is wedge-shaped, which can prevent the outer powder-resistant sleeve from colliding with the inner powder-resistant sleeve as it descends with the pull rod. Attached Figure Description

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is a cross-sectional structural diagram of Embodiment 1 of the present invention.

[0025] Figure 2 This is an exploded structural diagram of Embodiment 1 of the present invention.

[0026] Figure 3 This is a schematic diagram of the structure of this utility model.

[0027] Figure 4 This is a cross-sectional structural diagram of the present invention in use.

[0028] Figure 5 This is a schematic diagram illustrating the usage state of this utility model. Figure 1 .

[0029] Figure 6 This is a schematic diagram of the structure of Embodiment 2 of this utility model.

[0030] Figure 7 This is a schematic diagram showing the usage state of this utility model.

[0031] Figure 8 This is a schematic diagram of the flexible coupling collar sleeve of this utility model. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0033] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "inner," "outer," "vertical," "circumferential," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0034] In the description of this utility model, "first feature" and "second feature" may include one or more of the indicated features. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the indicated features.

[0035] The present invention will be further described below with reference to the accompanying drawings.

[0036] Example 1: According to Figures 1 to 5 , Figure 7 The illustrated coal mill tie rod suspension stacked labyrinth dust-blocking sealing device includes:

[0037] Upper powder blocking mechanism 1: includes an outer powder blocking sleeve 3 and an inner powder blocking sleeve 4 partially sleeved in the cavity of the outer powder blocking sleeve 3; the upper part of the outer powder blocking sleeve 3 is connected to the pull rod 140 of the coal mill, and part of the outer powder blocking sleeve can slide along the outer wall of the inner powder blocking sleeve 4; the outer powder blocking sleeve 3 moves up and down with the pull rod.

[0038] Lower powder blocking mechanism 2: Located below the lower powder blocking mechanism, it includes a sealed box 6 and a lower powder blocking assembly located inside the sealed box 6. The lower powder blocking assembly includes two opposing lower powder blocking sleeves 7, with an elastic element 100 between the two lower powder blocking sleeves 7. The pull rod can move relative to the lower powder blocking sleeves; in specific applications, the pull rod passes through the sealed box.

[0039] Specifically, in another embodiment, the lower outer wall of the inner resistance powder sleeve 4 is provided with an annular upper flange plate 42 and a lower flange plate 43. Specifically, as shown... Figure 4 As shown, the internal resistance powder sleeve 4 is installed on the sealing base 110 via an upper and lower retaining plate. Specifically, the sealing base can be bolted to the coal mill housing 150 (e.g., ...). Figure 7As shown in the diagram, specifically, the sealing base 110 is provided with an annular groove that mates with the lower flange plate 43, which can be inserted into the annular groove. The upper flange plate can be installed on the sealing base with bolts. Figure 4 As shown, the sealing base 110 has an annular groove that adapts to the lower flange plate 43. The lower flange plate is engaged in the groove, and the upper flange plate is bolted to the top surface of the sealing base 110. The specific structure of the sealing base is not within the scope of this utility model and will not be described in detail. The lower flange plate, engaged in the groove, also acts as a barrier against coal dust from below, preventing coal dust from entering from the lower port of the inner dust-blocking sleeve.

[0040] The upper part of the inner powder-resistant sleeve 4 is provided with an upper powder-resistant end cap 41. Specifically, the upper powder-resistant end cap is located inside the sleeve cavity of the outer powder-resistant sleeve. The upper powder-resistant end cap 41 is installed on the inner powder-resistant sleeve 4 by connecting bolts. More specifically, the upper powder-resistant end cap 41 is provided with a bolt groove. During specific installation, the head of the connecting bolt does not extend beyond the bolt groove.

[0041] The inner powder-resistant sleeve 4 has a flexible coupling ring 5 on its cavity wall. Specifically, the flexible coupling ring 5 is made of fluorinated synthetic rubber with a certain deformation capacity, preferably graphite-modified fluorinated rubber, which has excellent wear resistance and self-lubricating properties. The flexible coupling ring 5 fits seamlessly with the pull rod, which can seal and block powder while also utilizing self-lubrication to allow the pull rod to move. Figure 1 As shown, there may be another embodiment in which the cavity of the inner resistance powder sleeve 4 has a groove adapted to the flexible coupling ring sleeve 5.

[0042] The two lower powder-resistant sleeves 7 are respectively provided with self-slip contact pieces 8 on one side of the upper and lower box walls near the sealing box 6; specifically, as shown in the figure Figure 1 As shown, the self-slip contact piece 8 contacts the upper and lower walls of the sealed box. Specifically, the self-slip contact piece 8 is made of polytetrafluoroethylene (PTFE), preferably of nanofiber-modified PTFE.

[0043] The lower powder-blocking sleeve 7 has a self-slipping powder-blocking sheet 9 inside its cavity. In specific implementation, the self-slipping powder-blocking sheet 9 is made of carbon crystal, preferably of polytetrafluoroethylene modified carbon crystal, which has a self-lubricating effect. It fits seamlessly with the pull rod, and its self-lubricating effect can seal and block powder while reducing friction when the pull rod moves.

[0044] The elastic element 100 is a spring or a rubber block. A certain elastic force is applied to the lower powder-blocking sleeve 7 through the elastic element to ensure that the lower powder-blocking sleeve 7 always remains in contact with the upper and lower walls of the sealing box, thus ensuring the stability of the lower powder-blocking sleeve within the sealing box. Alternatively, in specific applications, a rubber block can be used to utilize its rebound force to ensure that the self-slip contact piece of the lower powder-blocking sleeve always remains in contact with the upper and lower walls of the sealing box 6.

[0045] In specific implementation, when the elastic element is a spring, the opposite surfaces of the lower resistive sleeve 7 are provided with grooves for placing the spring. The grooves play a certain guiding and limiting role, and the two ends of the spring can be directly placed in the grooves.

[0046] When the elastic element is a rubber block, the rubber block can be directly contacted and clamped between the two lower powder-resistant sleeves.

[0047] The upper part of the outer resistance powder sleeve 3 is provided with a retaining sleeve 31. The outer resistance powder sleeve 31 is connected to the pull rod 140 through the retaining sleeve 31. Specifically, the outer resistance powder sleeve is connected to the pull rod by bolts. In specific implementation, the inner resistance powder sleeve is connected to the sealing base and will not move with the movement of the pull rod, while the outer resistance powder sleeve will move with the movement of the pull rod. The graphite-modified fluorinated synthetic rubber is soft and has a certain tensile deformation capacity, that is, it has a certain amount of expansion and contraction, which can better enable the inner resistance powder sleeve to move with the pull rod, for example, it can counteract the tilting action of the pull rod.

[0048] Specifically, the outer powder-resistant sleeve, the inner powder-resistant sleeve, and the lower powder-resistant sleeve can all be made of 38CrSi alloy steel.

[0049] Specifically, such as Figure 1 As shown, the sleeve 31 is located above the upper powder-blocking end cap. An annular retaining plate 311 extends outward from the outer powder-blocking sleeve. The sleeve 31 is provided with an annular retaining groove that cooperates with the annular retaining plate. The annular retaining groove is a distance from its bottom surface. The annular retaining plate 311 is engaged in the annular retaining groove, which can block the coal powder. When it cooperates with the outer powder-blocking sleeve, it has a certain "maze" effect, increasing the difficulty of entering the cavity of the inner powder-blocking sleeve and the pull rod.

[0050] The lower cavity wall of the outer resistance powder sleeve 3 is wedge-shaped, which can prevent the outer resistance powder sleeve from colliding with the inner resistance powder sleeve as the pull rod descends.

[0051] There may be other embodiments, such as Figure 1 The lower cavity wall of the sleeve cavity of the inner resistance powder sleeve 4 shown is a wedge-shaped slope.

[0052] In specific implementation, such as Figure 7As shown, the sealing base and its upper powder-blocking mechanism are installed inside the coal mill housing, and the sealing box and its lower powder-blocking sleeve are installed outside the coal mill housing. More specifically, the sealing box can be installed outside the coal mill housing by bolts or welding.

[0053] In a specific implementation, the sealing box can be installed on the coal mill housing via an upper box plate, for example by bolts or welding. The sealing box includes an openable lower box plate. The upper and lower box plates have through holes through which a pull rod can pass. The pull rod can move by passing through the through holes. Specifically, one side of the lower box plate is hinged to the sealing box, and the non-hinged side of the lower box plate can be detachably installed to the sealing box by bolts.

[0054] Example 2: According to Figures 1 to 7 The above describes a coal mill tie rod suspension stacked labyrinth dust-blocking sealing device, specifically as follows: Figure 6 As shown, compared to Embodiment 1, in this embodiment, the inner powder-resistant sleeve 4, the outer powder-resistant sleeve 3, and the lower powder-resistant sleeve 7 are each composed of two detachable halves that can be spliced ​​together to facilitate installation.

[0055] For example, Figure 6 As shown, the inner resistance powder sleeve 4 is divided into two halves, which are inner resistance powder sub-sleeves. They are detachably connected by bolts. For example, one inner resistance powder sub-sleeve is provided with a bolt groove 120, which penetrates the side wall, and the other inner resistance powder sub-sleeve is provided with a corresponding bolt hole.

[0056] Specifically, the sealing base can also be processed into a structure that can be detached and spliced ​​in two halves to accommodate the installation and disassembly of the sealing device.

[0057] The detachable splicing structure of the outer and lower resistance powder sleeves is similar to that of the inner resistance powder sleeve 4 (e.g., Figure 6 (As shown).

[0058] In practical applications, the annular sleeve wall of the flexible coupling collar is provided with an adaptable notch that extends vertically (e.g., ...). Figure 8 As shown), to facilitate adaptation installation, after installation, under the action of the half-inner resistance powder sleeve, the opposite two sides of the adaptation notch contact the seal.

[0059] The self-slipping powder-resistant sheet and the self-slipping contact sheet are both complete rings.

[0060] In this embodiment, during specific installation, for example, when installing the upper powder-blocking mechanism, first, the flexible coupling sleeve is fitted onto the pull rod. Then, the groove corresponding to the flexible coupling sleeve is placed so that the flexible coupling sleeve is locked in the groove. The two inner powder-blocking sleeves are then joined together. Bolts are then passed through the corresponding bolt grooves and bolt holes. After the two inner powder-blocking sleeves are assembled by bolts passing through the corresponding bolt grooves and bolt holes, they will compress the flexible coupling sleeve, causing adaptive deformation that seals the two sides of its notch and seamlessly fits the pull rod, thus achieving a sealing and powder-blocking effect. The inner powder-blocking sleeve is then installed on the sealing base. Afterward, the upper powder-blocking end cap 41 is installed on the inner powder-blocking sleeve, completing the installation of the inner powder-blocking sleeve. Then, the two halves of the outer powder-blocking sleeve are fitted onto the inner powder-blocking sleeve and joined together. Bolts are then passed through the corresponding bolt grooves and bolt holes. Finally, the retaining sleeve 31 is installed on the pull rod by bolts (specifically, as shown in the diagram). Figure 2 and Figure 6 As shown, the upper side of the sleeve is provided with bolt fixing holes. In specific applications, there are 8 bolt fixing holes, which are evenly distributed on the annular sleeve. After the bolt passes horizontally through the bolt fixing holes, it presses against the pull rod and locks in place. Combined with the engagement of the outer powder-resistant sleeve and the tightening force of the bolt in the bolt groove and bolt hole, the sleeve 31 can be installed on the pull rod by bolts, thus completing the installation of the outer powder-resistant sleeve.

[0061] When installing the lower powder blocking mechanism, first open the lower box plate of the sealing box, then fit the two halves of the two lower powder blocking sleeves onto the self-sliding powder blocking plates and align them. Pass the bolts through the corresponding bolt slots and bolt holes to assemble them. Then, place one of the self-sliding contact plates on the side of the first lower powder blocking sleeve that faces away from the groove. With the self-sliding contact plate facing upwards, pass the annular hole in the middle of this lower powder blocking sleeve through the pull rod and move it to the upper box plate until the self-sliding contact plate contacts the upper wall. Then, pass the pull rod through the second lower powder blocking sleeve and place the spring in the groove inside the second lower powder blocking sleeve. Then, make the grooves inside the two lower powder blocking sleeves correspond vertically. Then, move the second lower powder blocking sleeve until the two ends of the spring are located in the grooves of the two lower powder blocking sleeves. Finally, reinstall the lower box plate with bolts.

[0062] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A coal mill tie rod suspension stacked labyrinth dust-blocking sealing device, characterized in that, include: Upper powder blocking mechanism: includes an outer powder blocking sleeve and an inner powder blocking sleeve partially sleeved within the cavity of the outer powder blocking sleeve; the upper part of the outer powder blocking sleeve is connected to the pull rod of the coal mill, and the outer powder blocking sleeve moves with the pull rod; a portion of the outer powder blocking sleeve can slide along the outer wall of the inner powder blocking sleeve. Lower powder blocking mechanism: Located below the lower powder blocking mechanism, it includes a sealed box and a lower powder blocking assembly located inside the sealed box. The lower powder blocking assembly includes two opposing lower powder blocking sleeves, and an elastic element is provided between the two lower powder blocking sleeves.

2. The coal mill tie rod suspension stacked labyrinth dust-blocking sealing device according to claim 1, characterized in that, The lower outer wall of the internal resistance powder sleeve is provided with an upper flange plate and a lower flange plate.

3. The coal mill tie rod suspension stacked labyrinth dust-blocking sealing device according to claim 1, characterized in that, The upper part of the inner powder-resistant sleeve is provided with an upper powder-resistant end cap.

4. The coal mill tie rod suspension stacked labyrinth dust-blocking sealing device according to claim 1, characterized in that, The inner resistance powder sleeve is provided with a flexible coupling ring sleeve on the sleeve cavity wall.

5. The coal mill tie rod suspension stacked labyrinth dust-blocking sealing device according to claim 1, characterized in that, The two lower powder-blocking sleeves are respectively provided with self-slip contact pieces on one side of the upper and lower box walls facing the sealed box; The lower powder-blocking sleeve has a self-slipping powder-blocking plate inside its cavity.

6. The coal mill tie rod suspension stacked labyrinth dust-blocking sealing device according to claim 1, characterized in that, The elastic element is a spring or a rubber block.

7. The coal mill tie rod suspension stacked labyrinth dust-blocking sealing device according to claim 1, characterized in that, The upper part of the outer powder-resistant sleeve is provided with a retaining sleeve, and the outer powder-resistant sleeve is connected to the pull rod through the retaining sleeve.

8. The coal mill tie rod suspension stacked labyrinth dust-blocking sealing device according to claim 1, characterized in that, The lower cavity wall of the outer protective powder sleeve is wedge-shaped.

9. A coal mill tie rod suspension stacked labyrinth dust-blocking sealing device according to claim 1, characterized in that, The lower cavity wall of the inner resistance powder sleeve is wedge-shaped.

10. A coal mill tie rod suspension stacked labyrinth dust-blocking sealing device according to claim 1, characterized in that, The inner powder-resistant sleeve, outer powder-resistant sleeve, and lower powder-resistant sleeve are each composed of two detachable halves joined together.

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