Double seal structure of coal feeder cleaning chain sprocket

Abstract

The application relates to a double-sealing structure of a coal feeder cleaning chain sprocket, and relates to the field of coal feeders. The double-sealing structure comprises a sprocket body, an outer end cover arranged on the outer end surface of the sprocket body, a plurality of sealing portions arranged at the end away from the end surface of the inner edge portion, and a plurality of top pressing assemblies arranged on the inner side of the outer edge portion. Each sealing portion is in abutment with the inner edge portion and is in the form of an arc. At least two annular protrusions are arranged on each sealing portion. A first flexible sealing ring is sleeved on a sprocket shaft. At least two first annular grooves are arranged on the first flexible sealing ring. One sealing portion is provided with at least two top pressing assemblies. The top pressing assemblies are connected with the sealing portions and are used for pressing the protrusions of the sealing portions into the first annular grooves of the first flexible sealing ring. The application can improve the sealing performance of the sprocket on the cleaning chain.

Description

Technical Field

[0001] This application relates to the field of coal feeders, and in particular to a double-seal structure for a coal feeder cleaning chain sprocket. Background Technology

[0002] In coal-fired power generation systems, coal feeders are typically used to transport coal fuel. These feeders are equipped with conveyor belts. During transport, coal dust and other debris can fall and accumulate below the conveyor belt, affecting the feeder's operation. To clean these accumulated coal deposits, a cleaning chain is installed on the feeder to remove the debris.

[0003] The cleaning chain consists of a sprocket, a chain, and scrapers mounted on the chain. The sprocket drives the chain to rotate, which in turn moves the scrapers to clean up accumulated material. Because the sprocket is constantly exposed to coal dust pollution, coal dust and other particles can easily enter and cause wear on the sprocket and its internal bearings, leading to frequent damage. Currently, simple sealing methods such as single-layer sealing rings are commonly used on the sprocket. This method has poor sealing performance, resulting in frequent sprocket damage and requiring frequent maintenance and replacement. Therefore, improving the sealing performance of the sprocket has become a key issue. Summary of the Invention

[0004] To improve the sealing performance of the sprockets on the cleaning chain, this application provides a double-seal structure for the sprockets of the coal feeder cleaning chain.

[0005] This application provides a double-seal structure for the sprocket of a coal feeder cleaning chain, which adopts the following technical solution: A double-seal structure for a coal feeder cleaning chain sprocket includes: Sprocket body; An outer end cap is disposed on the outer end face of the sprocket body. The outer end cap has a through hole in the middle for the sprocket shaft to pass through. The outer end cap includes an end face, an outer edge located at the edge of the end face, and an inner edge located at the edge of the through hole. The width of the inner edge is smaller than the width of the outer edge. Multiple sealing parts are disposed at the end of the inner edge away from the end face, the multiple sealing parts abut against the inner edge, the multiple sealing parts are all arc-shaped, and each sealing part is provided with at least two annular protrusions; A first flexible sealing ring is sleeved on the sprocket shaft, and at least two first annular grooves are formed on the first flexible sealing ring. Multiple pressing components are disposed on the inner side of the outer edge portion. Each sealing portion corresponds to at least two pressing components. The pressing components are connected to the sealing portion and are used to press the protrusion of the sealing portion into the first annular groove of the first flexible sealing ring.

[0006] By adopting the above technical solution, the outer end cover is used to seal from the outside of the sprocket body. The first flexible sealing ring is sleeved on the sprocket shaft. Multiple sealing parts on the outer end cover form an annular shape and correspond to the position of the first flexible sealing ring. The convex strip on the sealing part is located outside the annular groove on the first flexible sealing ring. After the outer end cover is fixed to the outer end face of the sprocket body, the convex strip is moved towards the sprocket shaft by the top pressing component, so that the convex strip of the sealing part moves into the annular groove of the first sealing ring, so that the convex strip just contacts the first flexible sealing ring at the bottom of the annular groove. This reduces the gap between the outside and the sprocket body. In addition, the multiple convex strips and multiple first annular grooves further increase the tortuous complexity of the channel between the inside of the sprocket body and the outside, making it less likely for dust such as coal powder outside the sprocket body to enter the inside of the sprocket body and wear the bearings and other components, thereby increasing the sealing performance.

[0007] Optionally, each pressing assembly includes a bolt passing through the outer edge, a baffle disposed on the bolt, and a spring sleeved on the bolt; The bolt is threaded to the outer edge, the baffle is located between the outer edge and the inner edge, one end of the spring is fixedly connected to the baffle, and the other end is rotatably connected to the sealing part.

[0008] By adopting the above technical solution, the operator adjusts the position of the sealing part by tightening the bolts. While rotating the bolts, the sealing part moves towards the first flexible sealing ring, causing the protrusion on the sealing part to move into the first annular groove. When the bolts are tightened, the protrusion just abuts against the first flexible sealing ring at the bottom of the first annular groove, thereby reducing the gap between the inside of the sprocket body and the outside. Furthermore, when the sprocket rotates, due to friction or the increase in ambient temperature, the first flexible sealing ring and the sealing part undergo slight expansion, resulting in a slight increase in volume. The spring is compressed, making the gap between the protrusion and the first annular groove even smaller. Under the action of the spring, the resistance between the sprocket and the sprocket shaft is not too large, and only a slight expansion occurs between the sealing part and the first flexible sealing ring, so the rotation of the sprocket is not affected.

[0009] Optionally, the inner edge is provided with two first filling layers, which are located between the sprocket shaft and the inner edge.

[0010] By adopting the above technical solution, the gap between the outer end cover and the sprocket shaft is further reduced by setting a filling layer, making it more difficult for external dust such as coal powder to enter the interior of the sprocket body.

[0011] Optionally, a second annular groove is provided on the outer end face of the sprocket body, and the outer edge of the outer end cover is located in the second annular groove.

[0012] By adopting the above technical solution and setting the second annular groove, the outer edge of the outer end cover is located in the second annular groove when the outer end cover is installed, which further reduces the gap between the outer edge and the outer end face of the sprocket body, making it difficult for external dust such as coal dust to enter the interior of the outer end cover.

[0013] Optionally, a second filling layer is provided in the second annular groove, and the second filling layer is located between the outer edge and the outer end face of the sprocket body.

[0014] By adopting the above technical solution, the second filling layer further reduces the gap between the outer end cap and the second annular groove, thereby further improving the sealing performance of the outer end cap.

[0015] Optionally, a second flexible sealing ring is fitted on the sprocket shaft, and the second flexible sealing ring abuts against the inner end face of the sprocket body.

[0016] By adopting the above technical solution, the second flexible sealing ring is located inside the sprocket body, so that dust such as coal powder passing through the first flexible sealing ring and the sealing part is blocked again by the second flexible sealing ring, separating the dust such as coal powder from the bearing and other components, and further improving the sealing performance of the sprocket body.

[0017] Optionally, a graphite ring is provided on the inner end face of the sprocket body.

[0018] By adopting the above technical solution, a mechanical seal is formed by the graphite ring and the second flexible sealing ring, which further improves the sealing performance from inside the sprocket body and enhances the radial sealing performance of the inner end face of the sprocket body.

[0019] In summary, this application includes at least one of the following beneficial technical effects: 1. The outer end cap is used for sealing from the outside of the sprocket body. The first flexible sealing ring is sleeved on the sprocket shaft. Multiple sealing parts on the outer end cap form an annular shape and correspond to the position of the first flexible sealing ring. The convex strip on the sealing part is located outside the annular groove on the first flexible sealing ring. After the outer end cap is fixed to the outer end face of the sprocket body, the convex strip is moved towards the sprocket shaft by the top pressing assembly, so that the convex strip of the sealing part moves into the annular groove of the first sealing ring, so that the convex strip just contacts the first flexible sealing ring at the bottom of the annular groove. This reduces the gap between the outside and the sprocket body. In addition, the multiple convex strips and multiple first annular grooves further increase the tortuous complexity of the channel between the inside of the sprocket body and the outside, making it less likely for dust such as coal powder outside the sprocket body to enter the inside of the sprocket body and wear the bearings and other components, thereby increasing the sealing performance.

[0020] 2. The operator adjusts the position of the sealing part by tightening the bolts. As the bolts are turned, the sealing part moves toward the first flexible sealing ring, causing the protrusion on the sealing part to move into the first annular groove. When the bolts are tightened, the protrusion just abuts against the first flexible sealing ring at the bottom of the first annular groove, thereby reducing the gap between the inside of the sprocket body and the outside. When the sprocket rotates, due to friction or the increase in ambient temperature, the first flexible sealing ring and the sealing part expand slightly, resulting in a slight increase in volume. The spring is compressed, making the gap between the protrusion and the first annular groove even smaller. Under the action of the spring, the resistance between the sprocket and the sprocket shaft is not too large. Since only a slight expansion occurs between the sealing part and the first flexible sealing ring, the rotation of the sprocket is not affected. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of a double-seal structure of a coal feeder cleaning chain sprocket according to an embodiment of this application.

[0022] Figure 2 yes Figure 1 Enlarged view of part A in the middle.

[0023] Figure 3 yes Figure 1 Enlarged view of section B in the middle.

[0024] Explanation of reference numerals in the attached drawings: 10, sprocket shaft; 1, sprocket body; 11, second annular groove; 2, outer end cap; 21, through hole; 22, end face; 23, outer edge; 24, inner edge; 3, sealing part; 31, protrusion; 4, first flexible sealing ring; 41, first annular groove; 5, top pressure assembly; 51, bolt; 52, baffle; 53, spring; 6, first filling layer; 7, second filling layer; 8, second flexible sealing ring; 9, graphite ring. Detailed Implementation

[0025] The present application will be further described in detail below with reference to the accompanying drawings.

[0026] This application discloses a double-seal structure for the sprocket of a coal feeder cleaning chain.

[0027] Reference Figure 1 and Figure 2 A double-seal structure for a coal feeder cleaning chain sprocket includes a sprocket body 1, an outer end cover 2 disposed on the outer end face of the sprocket body 1, a first flexible sealing ring 4 sleeved on the sprocket shaft 10, a plurality of sealing parts 3 disposed on the outer end cover 2, and a top pressure assembly 5 disposed on the outer end cover 2 for adjusting the position of the sealing parts 3.

[0028] Reference Figure 1 and Figure 2The sprocket body 1 has a bearing inside and is fixed to the sprocket shaft 10, achieving a rotatable connection with the sprocket shaft 10 through the internal bearing. The outer end cover 2 consists of an end face 22, an outer edge 23, and an inner edge 24. A through hole 21 for the sprocket shaft 10 to pass through is opened in the middle of the outer end cover 2. The inner edge 24 is located at the edge of the through hole 21, and the outer edge 23 is located at the edge of the end face 22, with the inner edge 24 and the outer edge 23 located on the same surface of the end face 22. The width of the inner edge 24 is smaller than the width of the outer edge 23, and multiple sealing parts 3 are located on the inner edge 24 at the end away from the end face 22. The number of sealing parts 3 can be three, and in other embodiments, the number of sealing parts 3 can also be four, five, or other numbers. Taking three as an example, the three sealing parts 3 form a ring, and multiple protrusions 31 are provided on each sealing part 3. The protrusions 31 cooperate with multiple first annular grooves 41 opened on the outer surface of the first flexible sealing ring 4. The number of protruding strips 31 and the first annular groove 41 can each be three, or other numbers in other embodiments. In other embodiments, the upper groove of the first flexible sealing ring 4 can also be a threaded groove, and the protruding strips 31 on the plurality of sealing parts 3 can be threaded strips corresponding to the threaded groove. The first flexible sealing ring 4 is interference-fitted with the sprocket shaft 10, thereby fixing the position of the first flexible sealing ring 4.

[0029] Three fixing bolts can be installed on the outer end cover 2, and three threaded holes can be opened on the end face of the sprocket body 1. The operator can fix the outer end cover 2 to the outer end face of the sprocket body 1 through the fixing bolts and threaded holes. After the outer end cover 2 is fixed to the outer end face of the sprocket body 1, the sealing part 3 is located outside the first flexible sealing ring 4. The operator can adjust the position of multiple sealing parts 3 by adjusting the top pressure component 5, so that multiple sealing parts 3 move into the first annular groove 41. When the top pressure component 5 is adjusted to the limit position, the protrusion 31 just contacts the first flexible sealing ring 4 at the bottom of the first annular groove 41, thereby reducing the gap between the inside of the sprocket body 1 and the outside, making it difficult for external coal dust and other dust to pass through the first flexible sealing ring 4 and the sealing part 3 to enter the inside of the sprocket body 1, thereby causing wear on internal bearings and other components. The multiple protrusions 31 are tightly fitted with the first annular groove 41, which increases the tortuousness and complexity of the channel between the inside and outside of the sprocket body 1, further making it difficult for external coal dust and other dust to enter the inside of the sprocket body 1.

[0030] Reference Figure 1 and Figure 2The pressing assembly 5 includes a bolt 51, a baffle 52 fixedly connected to the bolt 51, and a spring 53 sleeved on the bolt 51. The bolt 51 is threaded to and passes through the outer edge 23. The baffle 52 is located inside the outer end cover 2, that is, between the outer edge 23 and the inner edge 24. One end of the spring 53 is fixedly connected to the baffle 52, and the other end is rotatably connected to the sealing part 3. One sealing part 3 corresponds to two pressing assemblies 5, and the two pressing assemblies 5 are located at opposite ends of the sealing part 3.

[0031] After the worker fixes the outer end face to the outer end face of the sprocket body 1, the bolt 51 of the top pressing assembly 5 is rotated, causing the bolt 51 to move towards the sprocket shaft 10. During the movement of the bolt 51, the spring 53 and the sealing part 3 move towards the sprocket shaft 10. When the bolt 51 is tightened, the protrusion 31 on the sealing part 3 is just in contact with the first flexible sealing ring 4 at the bottom of the first annular groove 41. At this time, the sealing part 3 and the first flexible sealing ring 4 do not squeeze each other, so that the sprocket body 1 can rotate on the sprocket shaft 10 without the first flexible sealing ring 4 and the sealing part 3 experiencing almost no wear. When the sprocket rotates, there may be heat generation, causing the internal temperature of the sprocket body 1 to rise, which in turn causes the first flexible sealing ring 4 and the sealing part 3 to expand slightly and increase in volume. At this time, the sealing part 3 squeezes the spring 53, putting the spring 53 in a slightly compressed state, further reducing the gap between the protrusion 31 and the first flexible sealing ring 4, making it more difficult for external coal dust and other dust to enter the interior of the sprocket body 1. The sealing ring and the first flexible sealing ring 4 are only in a state of slight expansion and compression, so it does not affect the rotation of the sprocket body 1 on the sprocket shaft 10. When the temperature drops, the first flexible sealing ring 4 and the sealing part 3 return to their original volume, and the spring 53 returns to its original length, so that the convex strip 31 is in contact with the first flexible sealing ring 4 at the bottom of the first annular groove 41 again.

[0032] Reference Figure 1 and Figure 2 A first filling layer 6 is fixedly connected to the inner edge 24 of the outer end cover 2, and the first filling layer 6 is located between the inner edge 24 and the sprocket shaft 10. The first filling layer 6 can be composed of materials such as asbestos, graphite, and fiber, which reduces the gap between the inner edge 24 of the outer end cover 2 and the sprocket shaft 10, making it difficult for external dust such as coal dust to enter the interior of the sprocket body 1. The first filling layer 6 serves as the initial seal before the sealing part 3 and the first flexible sealing ring 4.

[0033] To improve the sealing performance between the outer end cap 2 and the outer end face of the sprocket body 1, refer to Figure 1 and Figure 3A second annular groove 11, with the same diameter as the outer edge 23, is formed on the outer end face of the sprocket body 1. When the operator installs the outer end cover 2, the outer edge 23 of the outer end cover 2 is placed into the second annular groove 11. The second annular groove 11 reduces the gap between the outer edge 23 and the outer end face of the sprocket body 1, making it difficult for external dust such as coal dust to enter the outer end cover 2. Furthermore, a second filling layer 7 is provided in the second annular groove 11. The second filling layer 7 can be composed of grease or wool felt, which further improves the sealing between the outer edge 23 and the outer end face of the sprocket body 1.

[0034] To improve sealing performance from inside the sprocket, refer to Figure 2 A second flexible sealing ring 8 is fitted onto the sprocket shaft 10. The second flexible sealing ring 8 is located on the inner end face of the sprocket body 1, and the second flexible sealing ring 8 is interference-fitted with the sprocket shaft 10. A groove is formed on the inner end face of the sprocket body 1, and a graphite ring 9 is disposed inside the groove, abutting against the second flexible sealing ring 8. The graphite ring 9 rubs against the bearing end face to achieve radial sealing, further improving the sealing performance inside the sprocket body 1.

[0035] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A double-seal structure for a coal feeder cleaning chain sprocket, characterized in that: include Sprocket body (1); An outer end cap (2) is provided on the outer end face of the sprocket body (1). The outer end cap (2) has a through hole (21) in the middle for the sprocket shaft to pass through. The outer end cap (2) includes an end face (22), an outer edge (23) located at the edge of the end face (22), and an inner edge (24) located at the edge of the through hole (21). The width of the inner edge (24) is smaller than the width of the outer edge (23). Multiple sealing parts (3) are provided at one end of the inner edge (24) away from the end face (22). The multiple sealing parts (3) abut against the inner edge (24). The multiple sealing parts (3) are all arc-shaped. Each sealing part (3) is provided with at least two annular protrusions (31). A first flexible sealing ring (4) is sleeved on the sprocket shaft, and at least two first annular grooves (41) are provided on the first flexible sealing ring (4); Multiple pressing components (5) are disposed on the inner side of the outer edge (23). One sealing part (3) corresponds to at least two pressing components (5). The pressing components (5) are connected to the sealing part (3) and are used to push the protrusion (31) of the sealing part (3) into the first annular groove (41) of the first flexible sealing ring (4).

2. The double-seal structure of the coal feeder cleaning chain sprocket according to claim 1, characterized in that: Each top-pressing assembly includes a bolt (51) passing through the outer edge (23), a baffle (52) disposed on the bolt (51), and a spring (53) sleeved on the bolt (51); The bolt (51) is threaded to the outer edge (23), the baffle (52) is located between the outer edge (23) and the inner edge (24), one end of the spring (53) is fixedly connected to the baffle (52), and the other end is rotatably connected to the sealing part (3).

3. The double-seal structure of the coal feeder cleaning chain sprocket according to claim 1, characterized in that: A first filling layer (6) is provided on the inner edge (24), and the first filling layer (6) is located between the sprocket shaft and the inner edge (24).

4. The double-seal structure of the coal feeder cleaning chain sprocket according to claim 1, characterized in that: The outer end face of the sprocket body (1) is provided with a second annular groove (11), and the outer edge (23) of the outer end cover (2) is located in the second annular groove (11).

5. The double-seal structure of the coal feeder cleaning chain sprocket according to claim 4, characterized in that: A second filling layer (7) is provided in the second annular groove (11), and the second filling layer (7) is located between the outer edge (23) and the outer end face of the sprocket body (1).

6. The double-seal structure of the coal feeder cleaning chain sprocket according to claim 1, characterized in that: A second flexible sealing ring (8) is fitted on the sprocket shaft, and the second flexible sealing ring (8) abuts against the inner end face of the sprocket body (1).

7. A double-seal structure for a coal feeder cleaning chain sprocket according to claim 1 or 6, characterized in that: A graphite ring (9) is provided on the inner end face of the sprocket body (1).

Images