A new type of sealing device on tie rod of medium speed coal mill

Abstract

The utility model discloses a novel sealing device on the tie rod of a medium-speed coal mill, which comprises: a tie rod and a fixed clamping plate, a flange is provided on the lower side of the fixed clamping plate, a groove is provided on the flange, the fixed clamping plate is slidably connected to the groove, the fixed clamping plate is composed of a first clamping plate and a second clamping plate, the tie rod is located in the middle of the first clamping plate and the second clamping plate, a first sealing ring and a second sealing ring are embedded on the first clamping plate and the second clamping plate located on the outer side of the tie rod, both sides of the first clamping plate and the second clamping plate are provided with limiting grooves, a limiting plate is provided on the flange, and the inward ends of the limiting plates on both sides are slidably connected to the limiting grooves, a sealing plate is provided on the lower side of the flange, the tie rod is slidably connected to the sealing plate, and a third sealing ring is provided at the connection with the sealing plate. Through the above structure, the problems of high failure rate and difficult maintenance of sleeve-type tie rod seals are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical sealing devices, in particular to a novel sealing device on a tie rod of a medium-speed coal mill. Background Art

[0002] The medium-speed coal mill is an important auxiliary equipment in a thermal power plant. It is the fuel preparation equipment for the unit. The tie rod of the medium-speed coal mill is an important component of the loading device. During the operation of the equipment, the tie rod of the medium-speed coal mill has both axial and radial movements.

[0003] In the prior art, a sleeve-type tie rod seal is composed of an inner and outer sleeve of two parts, the upper part being the outer sleeve and the lower part being the outer sleeve. The upper part is shrunk and clamped on the boss of the tie rod. Both ends of the lower sleeve are joint ball bearings, the upper end is inserted into the inside of the upper sleeve, and the lower end is fixed to the tie rod seal box through a seat. Due to the up and down fluctuations and left and right swings of the tie rod during the operation of the medium-speed coal mill, the upper sleeve and the tie rod boss, the upper joint ball bearing of the lower sleeve and other parts are severely worn, and the joint ball bearing at the lowest part is exposed to coal powder, causing rust, jamming and other problems. This type of seal is bulky and has a complex structure with a high failure rate, and it is very difficult to dismantle and repair after a failure. Therefore, a new type of medium-speed coal mill tie rod upper sealing device is proposed. Utility Model Content

[0004] In view of the deficiencies of the prior art, the utility model provides a novel sealing device on the tie rod of a medium-speed coal mill, which solves the problems of high failure rate and difficult maintenance of sleeve-type tie rod seals.

[0005] The utility model also provides a sealing device on a tie rod of a new medium-speed coal mill as mentioned above, comprising: a tie rod and a fixed splint, a flange is provided on the lower side of the fixed splint, a groove is provided on the flange, the fixed splint is slidably connected to the groove, the fixed splint is composed of a first splint and a second splint, the tie rod is located in the middle of the first splint and the second splint, a first sealing ring and a second sealing ring are embedded on the first splint and the second splint located on the outside of the tie rod, limiting grooves are provided on both sides of the first splint and the second splint, a limiting plate is provided on the flange, the inward ends of the limiting plates on both sides are slidably connected to the limiting grooves, a sealing plate is provided on the lower side of the flange, the tie rod is slidably connected to the sealing plate, and a third sealing ring is provided at the connection with the sealing plate.

[0006] According to the novel sealing device on the tie rod of a medium-speed coal mill, bolts are threadedly connected between the limit plate and the flange, and the sealing plate is fixedly connected to the flange by bolts.

[0007] According to the novel sealing device on the tie rod of a medium-speed coal mill, the fixed clamping plate is circular as a whole, and the first clamping plate and the second clamping plate are semicircular.

[0008] According to the novel sealing device on the tie rod of a medium-speed coal mill, a gap is provided between the first clamping plate, the second clamping plate and the flange and the tie rod, and the gap is about 3CM.

[0009] According to the novel sealing device on the tie rod of a medium-speed coal mill, a through hole is provided on the outer side of the second clamping plate, and the first clamping plate and the second clamping plate are fixed by screws passing through the through hole.

[0010] According to the novel sealing device on the tie rod of a medium-speed coal mill, the first sealing ring, the second sealing ring and the third sealing ring are all made of fluororubber.

[0011] The utility model has the following beneficial effects:

[0012] In the utility model, a fixed clamping plate and a sealing ring are provided on the outside of the pull rod, which are then fixed by screws. At the same time, a 3CM gap is left between the first clamping plate, the second clamping plate and the flange and the pull rod, so that the problem of wear of the pull rod caused by contact with the pull rod can be avoided. During maintenance, the bolts are removed, the fixed clamping plate is opened, and the sealing ring is replaced. The maintenance is simple and the cost is low.

[0013] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0015] Figure 1 This is a structural diagram of a new type of sealing device on the tie rod of a medium-speed coal mill according to the utility model;

[0016] Figure 2 This is a partial structural diagram of a new type of sealing device on the tie rod of a medium-speed coal mill according to the utility model;

[0017] Figure 3 This is a structural diagram of a fixing clamping plate of a new type of sealing device on a tie rod of a medium-speed coal mill according to the utility model;

[0018] Figure 4 for Figure 1 A magnified view of the structure at center A;

[0019] Figure 5 for Figure 1 A magnified view of the structure at point B.

[0020] Legend:

[0021] 1. Pull rod; 2. Fixed splint; 21. First splint; 22. Second splint; 23. Through hole; 24. Limiting groove; 3. Flange; 31. Groove; 4. Limiting plate; 41. Bolt; 5. Sealing plate; 6. First sealing ring; 7. Second sealing ring; 8. Third sealing ring; 9. Gap. DETAILED DESCRIPTION

[0022] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0023] Reference Figure 1-5 The utility model embodiment is a novel sealing device for the tie rod of a medium-speed coal mill, which includes a tie rod 1 and a fixed clamping plate 2. A flange 3 is provided on the lower side of the fixed clamping plate 2. A gap 9 is provided between the first clamping plate 21, the second clamping plate 22 and the flange 3 and the tie rod 1. The gap 9 is about 3CM. A gap 9 of 3CM is left between the first clamping plate 21, the second clamping plate 22 and the flange 3 and the tie rod 1 to avoid the problem of wear of the tie rod 1 caused by contact with the tie rod 1. A groove 31 is provided on the flange 3. The fixed clamping plate 2 is slidably connected to the groove 31. The fixed clamping plate 2 is composed of the first clamping plate 21 and the second clamping plate 2. The fixing splint 2 is composed of a splint 22, the fixing splint 2 is circular as a whole, the first splint 21 and the second splint 22 are semicircular, a through hole 23 is arranged on the outer side of the second splint 22, the first splint 21 and the second splint 22 are fixed by screws passing through the through hole 23, the pull rod 1 is located in the middle of the first splint 21 and the second splint 22, the first splint 21 and the second splint 22 located on the outer side of the pull rod 1 are embedded with a first sealing ring 6 and a second sealing ring 7, the first sealing ring 6 and the second sealing ring 7 are both made of fluororubber, which not only ensures the sealing effect but also reduces the wear caused by relative movement;

[0024] Limiting grooves 24 are provided on both sides of the first clamping plate 21 and the second clamping plate 22. A limiting plate 4 is provided on the flange 3. The inward ends of the limiting plates 4 on both sides are slidably connected to the limiting grooves 24. The distance between the inner ends of the limiting plates 4 and the limiting grooves 24 is less than 3CM. A sealing plate 5 is provided on the lower side of the flange 3. Bolts 41 are threadedly connected between the limiting plate 4 and the flange 3. The sealing plate 5 is fixedly connected to the flange 3 by the bolts 41. The pull rod 1 is slidably connected to the sealing plate 5, and a third sealing ring 8 is provided at the connection with the sealing plate 5. The material of the third sealing ring 8 is fluororubber.

[0025] Working principle: During installation, place the pull rod 1 between the first clamp plate 21 and the second clamp plate 22, and then fix it by screwing through the through hole 23, so that the first sealing ring 6 and the second sealing ring 7 will seal it, and then place the fixed clamp plate 2 in the groove 31 on the flange 3, and slide the limit plate 4 into the limit groove 24, and then fix the limit plate 4 and the sealing plate 5 at the bottom of the flange 3 with the bolt 41. At the same time, a 3CM gap 9 is left between the first clamp plate 21, the second clamp plate 22 and the flange 3 and the pull rod 1 to avoid the problem of wear of the pull rod caused by contact with the pull rod 1; during maintenance, remove the bolt 41, open the fixed clamp plate 2, and replace the sealing ring. Maintenance is simple and low cost.

[0026] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A new type of sealing device for the tie rod of a medium-speed coal mill, characterized in that: include: A pull rod (1) and a fixed splint (2), wherein a flange (3) is provided on the lower side of the fixed splint (2), a groove (31) is provided on the flange (3), the fixed splint (2) is slidably connected to the groove (31), the fixed splint (2) is composed of a first splint (21) and a second splint (22), the pull rod (1) is located in the middle of the first splint (21) and the second splint (22), and the first splint (21) and the second splint (22) located outside the pull rod (1) are 2) is embedded with a first sealing ring (6) and a second sealing ring (7), both sides of the first clamping plate (21) and the second clamping plate (22) are provided with limiting grooves (24), a limiting plate (4) is provided on the flange (3), and the inward ends of the limiting plates (4) on both sides are slidably connected to the limiting grooves (24), a sealing plate (5) is provided on the lower side of the flange (3), the pull rod (1) is slidably connected to the sealing plate (5), and a third sealing ring (8) is provided at the connection with the sealing plate (5).

2. A novel sealing device for the tie rod of a medium-speed coal mill according to claim 1, characterized in that: Bolts (41) are threadedly connected between the limit plate (4) and the flange (3), and the sealing plate (5) is fixedly connected to the flange (3) by means of the bolts (41).

3. A novel sealing device for the tie rod of a medium-speed coal mill according to claim 2, characterized in that: The fixed clamping plate (2) is circular in shape as a whole, and the first clamping plate (21) and the second clamping plate (22) are semicircular in shape.

4. A novel sealing device for the tie rod of a medium-speed coal mill according to claim 3, characterized in that: A gap (9) is provided between the first clamping plate (21), the second clamping plate (22), the flange (3) and the pull rod (1), and the gap (9) is approximately 3 cm.

5. A novel sealing device for the tie rod of a medium-speed coal mill according to claim 4, characterized in that: A through hole (23) is provided on the outer side of the second clamping plate (22), and the first clamping plate (21) and the second clamping plate (22) are fixed together by screws passing through the through hole (23).

6. A novel sealing device for the tie rod of a medium-speed coal mill according to claim 5, characterized in that: The first sealing ring (6), the second sealing ring (7) and the third sealing ring (8) are all made of fluororubber.

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