Sealing device of negative pressure steel ball coal mill

Abstract

The utility model discloses a sealing device for a negative pressure steel ball coal mill, which is characterized in that a static ring consists of a first semicircular ring and a second semicircular ring, locking seats are fixedly mounted at the upper end and the lower end of the first semicircular ring, sliding locking mechanisms are arranged on the locking seats, and the first semicircular ring is fixedly clamped with the second semicircular ring through the sliding locking mechanisms; sealing teeth are fixedly arranged on the sealing end surfaces of the first semicircular ring and the second semicircular ring with the movable ring; and a ring groove for inserting the sealing teeth is formed in the outer side surface of the movable ring. The ring groove is formed in the outer side of the movable ring, and the static ring is clamped with the ring groove through the sealing teeth, so that the resistance of outwards leaking pulverized coal can be increased, and the radial sealing effect of the movable ring and the inlet and outlet short tubes of the static coal mill is enhanced; and meanwhile, the static ring is composed of two semicircular rings which are fixed through the sliding locking mechanism, so that the static ring is convenient to mount, dismount and replace.

Description

Technical Field

[0001] This utility model relates to the technical field of coal mill equipment, and in particular to a sealing device for a negative pressure steel ball coal mill. Background Technology

[0002] Currently, in order to prevent powder leakage from the gap between the moving and stationary parts of the inlet and outlet shaft ends of the medium-storage negative pressure steel ball coal mill, packing made of wear-resistant soft materials such as graphite is usually used for sealing. Packing grooves and packing caps are set on the outer end faces of the inlet and outlet drums of the coal mill, and the packing forms a seal along the outer circumference of the stationary inlet and outlet short pipes of the coal mill.

[0003] The existing coal mill moving and stationary rings use a simple bonding method. During operation, the vibration of the coal mill and the throwing of broken steel balls will cause the dynamic and stationary seal gap to increase, resulting in powder leakage at the shaft end. In order to prevent powder leakage, and because the stationary ring is prone to wear, the existing stationary ring also has the problem of inconvenient disassembly. Therefore, operators usually keep the coal mill running at a high negative pressure, which causes the coal mill to enter too much cold air, and reduces the output of the coal mill and increases the power consumption rate. Utility Model Content

[0004] The purpose of this utility model is to provide a sealing device for a negative pressure steel ball coal mill.

[0005] According to one aspect of this disclosure, the following technical solution is provided: a sealing device for a negative pressure steel ball coal mill, comprising a dynamic ring and a stationary ring disposed at the inlet and outlet short pipes of the coal mill drum. The stationary ring is composed of a first semicircular ring and a second semicircular ring. Both the first and second semicircular rings are fixedly installed on the outside of the openings of the inlet and outlet short pipes of the coal mill drum by bolts. Locking seats are fixedly installed at the upper and lower ends of the first semicircular ring, and a sliding locking mechanism is provided on the locking seats. The first semicircular ring is fixedly engaged with the second semicircular ring by the sliding locking mechanism. Sealing teeth are fixedly provided on the sealing end faces of the first and second semicircular rings and the dynamic ring. An annular groove for the insertion of the sealing teeth is opened on the outer side of the dynamic ring.

[0006] According to at least one embodiment of the negative pressure steel ball coal mill sealing device of the present disclosure, the locking seat surface is provided with a sliding groove along the length direction, one end of the sliding groove penetrates the inner surface of the locking seat, and the sliding locking mechanism is slidably installed in the sliding groove.

[0007] According to at least one embodiment of the negative pressure steel ball coal mill sealing device of the present disclosure, the sliding locking mechanism includes a sliding plate and a knob bolt. L-shaped grooves are provided at the upper and lower ends of the outer surface of the second semi-circular ring. The sliding plate is slidably installed in the groove. One end of the sliding plate is provided with an integrally structured plug-in part. The sliding plate engages with the L-shaped groove through the plug-in part.

[0008] According to at least one embodiment of the negative pressure steel ball coal mill sealing device of the present disclosure, a convex plate is fixedly provided on one side of the slide plate, and a plurality of threaded holes are evenly opened at one end of the bottom of the slide groove near the convex plate. The convex plate is connected to the corresponding threaded holes by a knob bolt.

[0009] According to at least one embodiment of the present disclosure, the sealing teeth of a negative pressure steel ball coal mill are provided in multiple layers.

[0010] According to at least one embodiment of the negative pressure steel ball coal mill sealing device of the present disclosure, one end of the sliding plate extends outside the chute.

[0011] The technical effects and advantages of this utility model are as follows:

[0012] This invention increases the resistance to coal powder leakage by setting an annular groove on the outside of the moving ring, and the stationary ring engages with the annular groove through sealing teeth, thereby enhancing the radial sealing effect of the moving ring and the stationary coal mill inlet and outlet short pipes. At the same time, the stationary ring is composed of two semi-circular rings, which are fixed by a sliding locking mechanism, thus facilitating the installation, disassembly and replacement of the stationary ring. Attached Figure Description

[0013] The accompanying drawings illustrate exemplary embodiments of the present disclosure and, together with the description thereof, serve to explain the principles of the present disclosure. These drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification.

[0014] Figure 1 This is a perspective view of a negative pressure steel ball coal mill sealing device according to this utility model.

[0015] Figure 2 This is a partial structural cross-sectional view of the second semi-circular ring of this utility model.

[0016] Figure 3 This is a partial structural cross-sectional view of the moving ring and stationary ring of this utility model.

[0017] Figure 4 This is a structural diagram of the locking seat of this utility model.

[0018] The specific labels in the attached figures are as follows:

[0019] 1. Coal mill drum; 2. Moving ring; 21. Ring groove; 3. Stationary ring; 31. First semi-circular ring; 32. Second semi-circular ring; 321. L-shaped groove; 4. Locking seat; 41. Slide groove; 5. Sliding locking mechanism; 51. Slide plate; 52. Protruding plate; 53. Insertion part; 54. Knob bolt; 6. Sealing tooth. Detailed Implementation

[0020] For descriptive purposes, this disclosure may use spatial relative terms such as “below,” “under,” “below,” “down,” “above,” “above,” “higher,” and “side (e.g., as in a “sidewall”)” to describe the relationship between one component and another component as shown in the accompanying drawings. In addition to the orientations depicted in the drawings, the spatial relative terms are also intended to encompass different orientations of the device during use, operation, and / or manufacture. For example, if the device in the drawings is flipped, a component described as “below” or “under” other components or features would subsequently be positioned “above” said other components or features. Thus, the exemplary term “below” can encompass both “above” and “below” orientations. Furthermore, the device may be otherwise positioned (e.g., rotated 90 degrees or in other orientations), thus interpreting the spatial relative descriptive terms used herein accordingly.

[0021] like Figure 1-4 As shown, a sealing device for a negative pressure steel ball coal mill in this disclosure includes a dynamic ring 2 and a stationary ring 3 disposed at the inlet and outlet short pipes of the coal mill drum 1. The stationary ring 3 is composed of a first semicircular ring 31 and a second semicircular ring 32. Both the first semicircular ring 31 and the second semicircular ring 32 are fixedly installed on the outside of the opening of the inlet and outlet short pipes of the coal mill drum 1 by bolts. Locking seats 4 are fixedly installed at the upper and lower ends of the first semicircular ring 31. A sliding locking mechanism 5 is provided on the locking seat 4. The first semicircular ring 31 is fixedly engaged with the second semicircular ring 32 by the sliding locking mechanism 5. Sealing teeth 6 are fixedly provided on the sealing end faces of the first semicircular ring 31 and the second semicircular ring 32 and the dynamic ring 2. An annular groove 21 for the insertion of the sealing teeth 6 is opened on the outer side of the dynamic ring 2.

[0022] In this embodiment, a groove 41 is provided on the surface of the locking seat 4 along the length direction. One end of the groove 41 penetrates the inner surface of the locking seat 4, and the sliding locking mechanism 5 is slidably installed in the groove 41.

[0023] Furthermore, in order to achieve the engagement between the first semicircular ring 31 and the second semicircular ring 32, in this embodiment, the sliding locking mechanism 5 includes a sliding plate 51 and a knob bolt 54. L-shaped grooves 321 are provided at the upper and lower ends of the outer surface of the second semicircular ring 31. The sliding plate 51 is slidably installed in the sliding groove 41. One end of the sliding plate 51 is provided with an integral insertion part 53. The sliding plate 51 engages with the L-shaped groove 321 through the insertion part 53.

[0024] In this embodiment, a protruding plate 52 is fixedly provided on one side of the slide plate 51, and a plurality of threaded holes are evenly opened at one end of the bottom of the slide groove 41 near the position of the protruding plate 52. The protruding plate 52 is connected to the corresponding threaded holes by a knob bolt.

[0025] To enhance the sealing performance between the moving ring 2 and the stationary ring 21, in this embodiment, the sealing teeth 6 are provided with multiple layers.

[0026] Furthermore, to facilitate the sliding of the slide plate 51 by the staff, in this embodiment, one end of the slide plate 51 extends outside the slide groove 41.

[0027] The specific operating steps are as follows: by engaging the first semi-circular ring 31 and the second semi-circular ring 32 on both sides of the moving ring 2, the sealing teeth 6 are inserted into the ring groove 21. The first semi-circular ring 31 and the second semi-circular ring 32 are fixed to the coal mill drum 1 with bolts. Then, the slide plate 51 is slid so that its insertion part 53 is engaged in the L-shaped groove 321. Then, it is fixed by the knob bolt 54. At this time, the first semi-circular ring 31 can be fixedly engaged with the second semi-circular ring 32.

[0028] In the description of this specification, the references to terms such as "one embodiment / mode," "some embodiments / modes," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment / mode or example is included in at least one embodiment / mode or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment / mode or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments / modes or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments / modes or examples described in this specification, as well as the features of different embodiments / modes or examples.

[0029] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0030] Those skilled in the art should understand that the above embodiments are merely for illustrating the present disclosure and are not intended to limit the scope of the disclosure. Those skilled in the art can make other changes or modifications based on the above disclosure, and these changes or modifications still fall within the scope of the present disclosure.

Claims

1. A sealing device for a negative pressure steel ball coal mill, comprising a dynamic ring and a stationary ring disposed at the inlet and outlet short pipes of the coal mill drum, characterized in that: The stationary ring is composed of a first semicircular ring and a second semicircular ring. Both the first and second semicircular rings are fixedly installed on the outside of the openings of the short pipes at the inlet and outlet of the coal mill drum by bolts. Locking seats are fixedly installed at the upper and lower ends of the first semicircular ring, and the locking seats are provided with sliding locking mechanisms. The first semicircular ring is fixedly engaged with the second semicircular ring through the sliding locking mechanisms. Sealing teeth are fixedly provided on the sealing end faces of the first and second semicircular rings and the moving ring. The outer side of the moving ring is provided with an annular groove for the insertion of the sealing teeth.

2. The sealing device for a negative pressure steel ball coal mill according to claim 1, characterized in that: The locking seat has a groove along its length, with one end of the groove penetrating the inner surface of the locking seat, and the sliding locking mechanism is slidably installed in the groove.

3. The sealing device for a negative pressure steel ball coal mill according to claim 2, characterized in that: The sliding locking mechanism includes a sliding plate and a knob bolt. L-shaped grooves are provided at the upper and lower ends of the outer surface of the second semi-circular ring. The sliding plate is slidably installed in the groove. One end of the sliding plate is provided with an integral plug-in part. The sliding plate engages with the L-shaped groove through the plug-in part.

4. The sealing device for a negative pressure steel ball coal mill according to claim 3, characterized in that: A protruding plate is fixedly provided on one side of the slide plate, and multiple threaded holes are evenly opened at one end of the bottom of the slide groove near the protruding plate. The protruding plate is connected to the corresponding threaded holes by a knob bolt.

5. The sealing device for a negative pressure steel ball coal mill according to claim 1, characterized in that: The sealing teeth have multiple layers.

6. The sealing device for a negative pressure steel ball coal mill according to claim 3, characterized in that: One end of the slide plate extends outside the slide groove.

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