Coal mill lower machine body with sealing device

Abstract

The utility model discloses a coal mill lower machine body with a sealing device, which relates to the technical field of sealing devices and comprises a coal mill lower machine body and a sealing assembly. A speed reducer is arranged in the lower coal mill body, a rotating shaft is fixed to an output shaft of the speed reducer and located in an opening formed in the upper end of the lower coal mill body, and a milling bowl is fixed to the upper end of the rotating shaft; the sealing assembly comprises a wear-resistant steel conical ring, a conical connecting ring, a first carbon fiber synthesis ring, a supporting strip and a U-shaped groove, the wear-resistant steel conical ring sleeves the upper end of the circumferential surface of the rotating shaft, the lower end of the wear-resistant steel conical ring is fixed above a lower machine body of the coal mill, the conical connecting ring is fixed in the wear-resistant steel conical ring, and the supporting strip is fixed in the conical connecting ring. A first carbon fiber synthesis ring is fixed at the lower end of the conical connecting ring, so that the rotating shaft at the lower end of the milling bowl can be effectively prevented from being abraded, and meanwhile, coal slag can be prevented from entering a gap between the rotating shaft and the lower body of the coal mill.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing devices, in particular to a coal mill lower body with a sealing device. Background Art

[0002] The medium-speed bowl-type coal mill is composed of a separator body, a machine body, a guide device, a coal drop pipe, a grinding roller, a grinding bowl and other components. The outer seal of the lower body of the coal mill uses rubber seals and metal seals. The rubber seal will age after 3 to 5 months of use and will harden and produce small cracks under high temperature. In this way, fine powder and ash will form hard blocks with the cracks and wear against the shaft. The metal seal is also a gap seal. If there is direct contact, it will cause wear on the rotating shaft at the lower end of the grinding bowl. If the gap is large, screaming will occur, noise will be generated, and the effect is not ideal. Due to the current coal market, thermal power plants burn a large amount of inferior coal. The inferior coal contains more stone coal and fine ash particles, which can easily enter the sealing cavity of the air seal device during operation, resulting in further accelerated wear of the air seal parts inside and outside the coal mill and aggravated seal leakage. For this reason, we propose a coal mill lower body with a sealing device. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the existing defects and provide a coal mill lower body with a sealing device, which can effectively prevent the shaft at the lower end of the grinding bowl from wearing and tearing, and at the same time prevent coal slag from entering the gap between the shaft and the coal mill lower body, and can effectively solve the problems in the background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a coal mill lower body with a sealing device, comprising a coal mill lower body and a sealing assembly;

[0005] Coal mill lower body: a reducer is arranged inside, a rotating shaft is fixed on the output shaft of the reducer, the rotating shaft is located in an opening arranged at the upper end of the coal mill lower body, and a grinding bowl is fixed on the upper end of the rotating shaft;

[0006] Sealing assembly: It includes a wear-resistant steel conical ring, a conical connecting ring, a first carbon fiber composite ring, support bars and a U-shaped groove. A wear-resistant steel conical ring is sleeved on the upper end of the circumferential surface of the rotating shaft. The lower end of the wear-resistant steel conical ring is fixed above the lower body of the coal mill. A conical connecting ring is fixed inside the wear-resistant steel conical ring. The lower end of the conical connecting ring is fixed with a first carbon fiber composite ring. The first carbon fiber composite ring is fixed inside the opening provided at the upper end of the lower body of the coal mill. The first carbon fiber composite ring is sleeved on the circumferential surface of the rotating shaft. A U-shaped groove is opened at the upper end of the first carbon fiber composite ring. An annular groove is opened at the lower end inside the U-shaped groove. Uniformly distributed support bars are fixed inside the annular groove. A collection assembly is installed at the lower end of the first carbon fiber composite ring. The gap between the rotating shaft and the lower body of the coal mill is sealed by setting the sealing assembly.

[0007] Furthermore, the collection assembly includes a collection ring, an annular collection groove and an annular feed groove. The collection ring is fixed at the lower end of the first carbon fiber composite ring. An annular feed groove is opened at the upper end of the collection ring. The annular feed groove corresponds to the annular groove opened at the lower end inside the U-shaped groove. An annular collection groove is opened on the circumferential surface of the collection ring. The coal slag is collected by setting the collection assembly.

[0008] Furthermore, a threaded groove is opened on the circumferential surface of the collection ring. An internal thread ring is threadedly connected to the circumferential surface of the collection ring. A conical blanking ring is fixed inside the annular collection groove. The annular collection groove is sealed by setting the internal thread ring.

[0009] Furthermore, a second carbon fiber composite ring is sleeved on the circumferential surface of the rotating shaft. The second carbon fiber composite ring is fixed at the upper end of the first carbon fiber composite ring. By setting the second carbon fiber composite ring, it can further prevent coal slag from entering the gap between the rotating shaft and the lower body of the coal mill.

[0010] Furthermore, an observation port is opened on the circumferential surface of the collection ring. A transparent disc is fixed inside the observation port. By setting the transparent disc, users can very conveniently observe the situation inside the collection ring.

[0011] Furthermore, uniformly distributed handles are fixed on the circumferential surface of the internal thread ring. A rubber sleeve is fixed on the surface of the handle. Users can pull the internal thread ring to move through the handle.

[0012] Compared with the prior art, the beneficial effects of the present utility model are: The lower body of the coal mill with a sealing device has the following advantages:

[0013] By setting the first carbon fiber composite ring, it has higher wear resistance compared with the traditional rubber sealing strip. By setting the wear-resistant steel conical ring, it can block the coal cinder entering above the lower body of the coal mill during use. When the coal cinder enters the gap between the wear-resistant steel conical ring and the rotating shaft, it will enter the interior of the U-shaped groove downward for collection, avoiding the coal cinder from entering the gap between the rotating shaft and the lower body of the coal mill. In this way, the wear of the rotating shaft can be effectively avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the front side structure of the present invention;

[0015] Figure 2 Front side sectional view of the present invention;

[0016] Figure 3 Enlarged view of part A of the present invention;

[0017] Figure 4 Schematic diagram of the structure at the transparent plate of the present invention.

[0018] In the figure: 1 lower body of the coal mill, 2 speed reducer, 3 rotating shaft, 4 grinding bowl, 5 sealing assembly, 51 wear-resistant steel conical ring, 52 conical connecting ring, 53 first carbon fiber composite ring, 54 support bar, 55 U-shaped groove, 6 collection assembly, 61 collection ring, 62 annular collection groove, 63 annular feed groove, 7 conical blanking ring, 8 internal thread ring, 9 second carbon fiber composite ring, 10 transparent disc, 11 handle, 12 rubber sleeve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0020] Please refer to Figures 1-4 , this embodiment provides a technical solution: A lower body of a coal mill with a sealing device, including a lower body 1 of the coal mill and a sealing assembly 5;

[0021] Lower body 1 of the coal mill: A speed reducer 2 is arranged inside, a rotating shaft 3 is fixed on the output shaft of the speed reducer 2, the rotating shaft 3 is located in the opening provided at the upper end of the lower body 1 of the coal mill, and a grinding bowl 4 is fixed at the upper end of the rotating shaft 3;

[0022] Sealing assembly 5: It includes a wear-resistant steel conical ring 51, a conical connecting ring 52, a first carbon fiber composite ring 53, a support bar 54 and a U-shaped groove 55. The upper end of the circumferential surface of the rotating shaft 3 is sleeved with a wear-resistant steel conical ring 51. The lower end of the wear-resistant steel conical ring 51 is fixed above the lower body 1 of the coal mill. A conical connecting ring 52 is fixed inside the wear-resistant steel conical ring 51. A first carbon fiber composite ring 53 is fixed at the lower end of the conical connecting ring 52. The first carbon fiber composite ring 53 is fixed inside the opening provided at the upper end of the lower body 1 of the coal mill. The first carbon fiber composite ring 53 is sleeved on the circumferential surface of the rotating shaft 3. A U-shaped groove 55 is opened at the upper end of the first carbon fiber composite ring 53. An annular groove is opened at the lower end inside the U-shaped groove 55. Uniformly distributed support bars 54 are fixed inside the annular groove. A collection assembly 6 is installed at the lower end of the first carbon fiber composite ring 53. The collection assembly 6 includes a collection ring 61, an annular collection groove 62 and an annular feed groove 63. A collection ring 61 is fixed at the lower end of the first carbon fiber composite ring 53. An annular feed groove 63 is opened at the upper end of the collection ring 61. The annular feed groove 63 corresponds to the annular groove opened at the lower end inside the U-shaped groove 55. An annular collection groove 62 is opened on the circumferential surface of the collection ring 61. By setting the collection assembly 6, the coal slag is collected. By setting the sealing assembly 5, the gap between the rotating shaft 3 and the lower body 1 of the coal mill is sealed.

[0023] Wherein: Thread grooves are opened on the circumferential surface of the collection ring 61. An internal thread ring 8 is threadedly connected to the circumferential surface of the collection ring 61. A conical blanking ring 7 is fixed inside the annular collection groove 62. By setting the internal thread ring 8, the annular collection groove 62 is sealed.

[0024] Wherein: A second carbon fiber composite ring 9 is sleeved on the circumferential surface of the rotating shaft 3. The second carbon fiber composite ring 9 is fixed at the upper end of the first carbon fiber composite ring 53. By setting the second carbon fiber composite ring 9, it can further prevent coal slag from entering the gap between the rotating shaft 3 and the lower body 1 of the coal mill.

[0025] Wherein: An observation port is opened on the circumferential surface of the collection ring 61. A transparent disk 10 is fixed inside the observation port. By setting the transparent disk 10, it enables users to very conveniently observe the situation inside the collection ring 61.

[0026] Wherein: Uniformly distributed handles 11 are fixed on the circumferential surface of the internal thread ring 8. A rubber sleeve 12 is fixed on the surface of the handle 11. Users can pull the internal thread ring 8 to move through the handle 11.

[0027] The working principle of a lower body of a coal mill with a sealing device provided by the present utility model is as follows: During normal use, the wear-resistant steel conical ring 51 blocks the coal slag entering above the lower body 1 of the coal mill when in use. When the coal slag enters the gap between the wear-resistant steel conical ring 51 and the rotating shaft 3, it will then enter the interior of the U-shaped groove 55 downward along the conical connecting ring 52, and then enter the interior of the annular collecting groove 62 downward through the annular groove opened at the lower end inside the U-shaped groove 55 for storage. In this way, it can be avoided that the coal slag enters the gap between the rotating shaft 3 and the lower body 1 of the coal mill, thereby effectively preventing the rotating shaft 3 from being worn. At the same time, after long-term use, the internal thread ring 8 can be rotated downward to be separated from the collecting ring 61, and after separation, the coal slag inside the annular collecting groove 62 can be taken out.

[0028] The above are only the embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present utility model.

Claims

1. A lower body of a coal mill with a sealing device, characterized in that: It includes the lower body (1) of the coal mill and the sealing component (5); Lower body (1) of the coal mill: A speed reducer (2) is arranged inside. A rotating shaft (3) is fixed on the output shaft of the speed reducer (2). The rotating shaft (3) is located in the opening provided at the upper end of the lower body (1) of the coal mill. A grinding bowl (4) is fixed at the upper end of the rotating shaft (3); Sealing component (5): It includes a wear-resistant steel conical ring (51), a conical connecting ring (52), a first carbon fiber composite ring (53), a support bar (54) and a U-shaped groove (55). The upper end of the circumferential surface of the rotating shaft (3) is sleeved with a wear-resistant steel conical ring (51). The lower end of the wear-resistant steel conical ring (51) is fixed above the lower body (1) of the coal mill. A conical connecting ring (52) is fixed inside the wear-resistant steel conical ring (51). A first carbon fiber composite ring (53) is fixed at the lower end of the conical connecting ring (52). The first carbon fiber composite ring (53) is fixed inside the opening provided at the upper end of the lower body (1) of the coal mill. The first carbon fiber composite ring (53) is sleeved on the circumferential surface of the rotating shaft (3). A U-shaped groove (55) is opened at the upper end of the first carbon fiber composite ring (53). An annular groove is opened at the lower end inside the U-shaped groove (55). Uniformly distributed support bars (54) are fixed inside the annular groove. A collecting component (6) is installed at the lower end of the first carbon fiber composite ring (53).

2. The lower body of a coal mill with a sealing device according to claim 1, characterized in that: The collecting component (6) includes a collecting ring (61), an annular collecting groove (62) and an annular feeding groove (63). The collecting ring (61) is fixed at the lower end of the first carbon fiber composite ring (53). An annular feeding groove (63) is opened at the upper end of the collecting ring (61). The annular feeding groove (63) corresponds to the annular groove opened at the lower end inside the U-shaped groove (55). An annular collecting groove (62) is opened on the circumferential surface of the collecting ring (61).

3. The lower body of a coal mill with a sealing device according to claim 2, characterized in that: Thread grooves are opened on the circumferential surface of the collecting ring (61). An internal thread ring (8) is threadedly connected to the circumferential surface of the collecting ring (61). A conical blanking ring (7) is fixed inside the annular collecting groove (62).

4. A lower body of a coal mill with a sealing device according to claim 1, characterized in that: A second carbon fiber composite ring (9) is sleeved on the circumferential surface of the rotating shaft (3). The second carbon fiber composite ring (9) is fixed at the upper end of the first carbon fiber composite ring (53).

5. The lower body of a coal mill with a sealing device according to claim 2, characterized in that: An observation port is opened on the circumferential surface of the collecting ring (61). A transparent disc (10) is fixed inside the observation port.

6. The lower body of a coal mill with a sealing device according to claim 3, characterized in that: Uniformly distributed handles (11) are fixed on the circumferential surface of the internal thread ring (8). A rubber sleeve (12) is fixed on the surface of the handle (11).

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