Grinding roller oil seal of coal mill

Abstract

The utility model discloses a coal mill grinding roller oil seal, belongs to the technical field of oil seal structures, and provides a coal mill grinding roller oil seal capable of continuously working for a longer time. The coal mill grinding roller oil seal comprises a rubber ring, the rubber ring comprises an outer inclined part and an inner inclined part which are coaxial, and a coaxial limiting ring is arranged at the transition position between the outer inclined part and the inner inclined part; the included angle between the opposite side faces of the outer inclined part and the inner inclined part ranges from 80 degrees to 120 degrees, an oil storage cavity is formed between the opposite side faces of the outer inclined part and the inner inclined part, and the rubber ring is provided with a coaxial metal ring in the oil storage cavity. The oil storage cavity structure supported by the metal ring is arranged on the rubber main body part of the oil seal, so that more lubricating oil can be stored in the oil seal, the lubricating oil in the oil storage cavity can be automatically supplemented when the lubricating oil on the surface of the rubber ring is reduced, the surface of the oil seal can be kept smooth for a longer time, and the service life of the oil seal is prolonged. And the lubricating oil supplementing period is greatly prolonged, and the grinding roller can stably and continuously work for a longer time by supplementing the lubricating oil once.

Description

Technical Field

[0001] The present application relates to the technical field of oil seal structures, and in particular to a coal mill roller oil seal. Background Art

[0002] Coal mill is a large-scale machine with very large rotating parts. Therefore, a sealing structure of the same size is needed to avoid leakage of lubricating oil between relatively moving parts. The oil seal of the grinding roller is one of the important parts. In the prior art, the soft elasticity of the oil seal and the low friction coefficient after surface lubrication can achieve a good sealing effect. However, as the work progresses, the lubricating oil components on the surface of the oil seal are reduced, and the smoothness and sealing performance of the oil seal will be significantly reduced. It needs to be replenished regularly to maintain the normal and stable operation of the coal mill. Summary of the invention

[0003] The purpose of the present application is to provide a coal mill roller oil seal that can continuously work for a longer period of time.

[0004] To achieve the above purpose, the present application provides a coal mill roller oil seal: including a rubber ring, the rubber ring including a coaxial outer bevel portion and an inner bevel portion, a coaxial limit ring is provided at the transition between the outer bevel portion and the inner bevel portion, the angle between the opposite sides of the outer bevel portion and the inner bevel portion is in the range of 80° to 120°, an oil storage cavity is formed between the opposite sides of the outer bevel portion and the inner bevel portion, and the rubber ring is provided with a coaxial metal ring in the oil storage cavity to maintain the shape of the oil storage cavity stable.

[0005] Preferably, an accommodating cavity is formed inside the limiting ring, and the rubber ring is provided with a shaping ring in the accommodating cavity for maintaining the shape of the rubber ring stable so as to avoid deformation during installation and difficulty in aligning the rubber ring with the installation groove.

[0006] Preferably, the side of the outer oblique portion away from the limit ring has an outer clamping edge extending in the direction of the inner oblique portion, which is suitable for restraining the metal ring in the oil storage cavity for storing more lubricating oil. When the lubricating oil on the surface of the oil seal is reduced, it can be replenished by capillary action.

[0007] As a preference, the side of the inner oblique portion away from the limiting ring has an inner clamping edge extending in the direction of the outer oblique portion, which is also suitable for restraining the metal ring in the oil storage cavity, so that the metal ring 1 is not easy to fall off after matching with the rubber ring.

[0008] Preferably, the metal ring is provided with convection holes penetrating through both end surfaces, and there are a plurality of convection holes which are equidistantly arranged around the axis of the metal ring, so that the lubricating oil can overflow from as many positions as possible.

[0009] Preferably, an outer retaining ring is provided between the side surface of the outer inclined portion facing away from the inner inclined portion and the outer wall of the limiting ring, for fitting with a matching metal part to prevent lubricating oil from overflowing from the end surface of the metal part.

[0010] As a preference, an inner retaining ring is provided between the side surface of the inner inclined portion facing away from the outer inclined portion and the outer wall of the limiting ring, which is also used for close contact with the end surface of the metal part.

[0011] As a preferred embodiment, the rubber ring is wrapped around the outside of the shaping ring by injecting hot-melt rubber into a mold, so that the shaping ring will be very stable after configuration and almost integrated with the rubber ring.

[0012] Compared with the prior art, the beneficial effects of this application are:

[0013] (1) By providing an oil storage cavity structure supported by a metal ring on the rubber main body of the oil seal, more lubricating oil can be stored inside the oil seal. When the lubricating oil on the surface of the rubber ring is reduced, the lubricating oil in the oil storage cavity can be replenished automatically, so that the surface of the oil seal can remain smooth for a longer time, and the lubricating oil replenishment cycle is greatly extended. Once the lubricating oil is replenished, the grinding roller can work stably and continuously for a longer time, thereby reducing the maintenance cost of the grinding roller;

[0014] (2) By setting a shaping ring structure on the rubber main body of the oil seal, a larger oil seal is less likely to deform and is easier to align with the groove on the grinding roller mounting seat during installation. In addition, since the force on the rubber ring is more uniform, the distribution of the rubber material will be more uniform after the oil seal is configured, and the grinding roller joint surface can form a complete circle of consistent and good sealing area. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the coal mill roller oil seal;

[0016] Figure 2 It is a three-dimensional cross-sectional view of the overall structure of the coal mill roller oil seal;

[0017] Figure 3 For the coal mill roller oil seal Figure 2 A local enlarged view of point A;

[0018] Figure 4 It is a three-dimensional structural cross-sectional view of the matching metal ring and rubber ring of the grinding roller oil seal of the coal mill;

[0019] Figure 5 For the coal mill roller oil seal Figure 4 A partial enlarged view of point B.

[0020] In the figure: 1. metal ring; 101. convection hole; 2. rubber ring; 201. outer oblique part; 202. inner oblique part; 203. outer clamping edge; 204. inner clamping edge; 205. oil storage cavity; 206. outer retaining ring; 207. inner retaining ring; 208. limiting ring; 209. accommodating cavity; 3. shaping ring. DETAILED DESCRIPTION

[0021] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0022] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present application.

[0023] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0024] The terms "including" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0025] like Figure 1-5The coal mill roller oil seal shown in the figure includes a rubber ring 2 which plays a main sealing role. The specific structure of the rubber ring 2 includes a coaxial outer bevel portion 201 and an inner bevel portion 202. In fact, the outer bevel portion 201 and the inner bevel portion 202 are both conical, and the inner and outer side walls are both frustum surfaces with a certain slope. A coaxial limiting ring 208 is provided at the transition between the outer bevel portion 201 and the inner bevel portion 202. The inner and outer diameters of the limiting ring 208 are both located within the maximum diameter of the outer bevel portion 201 and outside the minimum diameter of the inner bevel portion 202. An accommodating cavity 209 is formed inside the limiting ring 208. The rubber ring A shaping ring 3 is arranged in the accommodating cavity 209. The shaping ring 3 is usually made of a plastic material with less elasticity and greater hardness, and is used to maintain the shape of the limiting ring 208. The rubber ring 2 is wrapped around the shaping ring 3 by injecting hot-melt rubber into the mold. Since the shaping ring 3 needs to be suspended in the mold cavity by the positioning pin in the mold, after the rubber ring 2 is molded and demolded, some holes will be left on its surface through which the shaping ring 3 can be observed. These holes do not affect the performance of the oil seal, but can store a certain amount of lubricating oil to improve the soft contact ability between the oil seal and the metal parts.

[0026] The angle between the opposite sides of the outer oblique portion 201 and the inner oblique portion 202 is within the range of 80° to 120°, that is, the angle between the inner wall cross-sectional line of the outer oblique portion 201 and the outer wall cross-sectional line of the inner oblique portion 202 along the plane passing through the axis and the radial direction is within the range of 80° to 120°. An annular oil storage cavity 205 is formed between the opposite sides of the outer oblique portion 201 and the inner oblique portion 202, which can store more lubricating oil for backup. The rubber ring 2 is provided with a coaxial metal ring 1 in the oil storage cavity 205, which is used to support the outer oblique portion 201 and the inner oblique portion 202 to avoid being close to each other. The metal ring 1 is provided with convection holes 101 that pass through the two end faces, allowing the lubricating oil to enter and exit the oil storage cavity 205. There are a plurality of convection holes 101, which are equidistantly arranged around the axis of the metal ring 1, so that lubricating oil can be supplied everywhere in the circumferential direction as much as possible. The side of the outer oblique portion 201 away from the limiting ring 208 has an outer card edge 203 extending in the direction of the inner oblique portion 202, which is used to constrain the metal ring 1 in the oil storage cavity 205. The side of the inner oblique portion 202 away from the limiting ring 208 has an inner card edge 204 extending in the direction of the outer oblique portion 201, which is also used to constrain the metal ring 1 in the oil storage cavity 205, and the outer card edge 203 and the inner card edge 204 are in close contact with the metal ring 1, and it is difficult for lubricating oil to pass through the fitting gap between the card edge and the metal ring 1.

[0027] An outer retaining ring 206 is provided between the side of the outer inclined portion 201 facing away from the inner inclined portion 202 and the outer wall of the limiting ring 208, which is used to fit the end face of the metal part sleeved on the outside. An inner retaining ring 207 is provided between the side of the inner inclined portion 202 facing away from the outer inclined portion 201 and the outer wall of the limiting ring 208, which is also used to fit the end face of the metal part embedded inside, thereby preventing oil leakage.

[0028] Working principle: first, match the two socketed metal parts, then fit the rubber ring 2 containing the shaping ring 3 to the ends of the two matched metal parts, embed the limit ring 208 between the outer wall of the inner metal part and the inner wall of the outer metal part, and then press the metal ring 1 into the oil storage chamber 205. At this time, the opening of the oil storage chamber 205 is upward, and lubricating oil can be injected into the oil storage chamber 205 through the convection hole 101 until the lubricating oil tends to overflow the oil storage chamber 205. Finally, press another metal part on the side of the outer card edge 203 and the inner card edge 204 to complete the configuration of the grinding roller oil seal. The configured grinding roller oil seal can change the axis from a vertical state to a horizontal state according to actual working requirements.

[0029] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A coal mill roller oil seal, characterized in that: The invention comprises a rubber ring (2), wherein the rubber ring (2) comprises a coaxial outer oblique portion (201) and an inner oblique portion (202); a coaxial limiting ring (208) is provided at a transition point between the outer oblique portion (201) and the inner oblique portion (202); an angle between the opposite sides of the outer oblique portion (201) and the inner oblique portion (202) is in the range of 80° to 120°; an oil storage cavity (205) is formed between the opposite sides of the outer oblique portion (201) and the inner oblique portion (202); and the rubber ring (2) is provided with a coaxial metal ring (1) in the oil storage cavity (205).

2. The coal mill roller oil seal according to claim 1, characterized in that: The limiting ring (208) has an accommodating cavity (209) formed inside, and the rubber ring (2) is provided with a shaping ring (3) in the accommodating cavity (209).

3. The coal mill roller oil seal according to claim 2, characterized in that: The side of the outer oblique portion (201) away from the limiting ring (208) has an outer clamping edge (203) extending in the direction of the inner oblique portion (202), suitable for restraining the metal ring (1) in the oil storage cavity (205).

4. The coal mill roller oil seal according to claim 3, characterized in that: The side surface of the inner oblique portion (202) away from the limiting ring (208) has an inner clamping edge (204) extending in the direction of the outer oblique portion (201), which is also suitable for restraining the metal ring (1) in the oil storage cavity (205).

5. The coal mill roller oil seal according to claim 4, characterized in that: The metal ring (1) is provided with convection holes (101) penetrating through both end surfaces. There are a plurality of convection holes (101), and the plurality of convection holes (101) are arranged at equal distances around the axis of the metal ring (1).

6. The coal mill roller oil seal according to any one of claims 2 to 5, characterized in that: An outer retaining ring (206) is provided between the side surface of the outer inclined portion (201) facing away from the inner inclined portion (202) and the outer wall of the limiting ring (208).

7. The coal mill roller oil seal according to claim 6, characterized in that: An inner retaining ring (207) is provided between the side surface of the inner inclined portion (202) facing away from the outer inclined portion (201) and the outer wall of the limiting ring (208).

8. The coal mill roller oil seal according to claim 7, characterized in that: The rubber ring (2) is formed by injecting hot-melt rubber into a mold and wrapping the outside of the shaping ring (3).

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