Multi-sealing device for lower bearing seat of steel rolling line vertical roll

Abstract

The utility model discloses a multiple sealing device for a lower bearing seat of a steel rolling line vertical roll, which is arranged between the lower end of the vertical roll and the upper end of the lower bearing seat and comprises a lower labyrinth sealing ring sleeved at the roll neck of the vertical roll and a lower bearing seat transparent cover fixed on the lower bearing seat through a screw, two oil seals which can be in dynamic sealing fit with the lower labyrinth sealing ring are arranged on the lower bearing seat transparent cover in a pressing manner through a gland, and the lower bearing seat transparent cover is further connected with an annular boss which extends into a groove of the lower labyrinth sealing ring to form non-contact labyrinth sealing; and an annular inner rubber sealing ring which extends into the groove of the lower labyrinth sealing ring and is in dynamic sealing fit with the inner hole surface of the groove is fixed on the outer circumference below the annular boss through a first hooping steel belt. According to the vertical rolling mill bearing seat, oxide scales and cooling water can be more effectively prevented from entering the bearing seat, and continuous and safe operation of a vertical rolling mill can be effectively guaranteed.

Description

Technical Field

[0001] This utility model relates to a multi-seal device for the lower bearing seat of a vertical roll in a steel rolling line. Background Technology

[0002] Steel mills typically install vertical rolling mills at the front end of their strip rolling lines. During the rolling process, the vertical rolling mill loosens the iron oxide scale on the surface of the slab, rolls the sides of the plate, and aligns the slab with the rolling line. A descaling device is designed behind the vertical rolling mill stand. The descaling machine cleans the iron oxide scale on the surface of the slab with high-pressure water. This results in a large amount of iron oxide scale accumulating on the upper part of the lower bearing housing of the vertical rolling mill. The iron oxide scale can easily enter the interior of the existing sealing device with the water flow and pass through the seal to reach the bearing housing, seriously threatening the safe operation of the bearing.

[0003] Figure 1 This diagram illustrates the sealing structure of the lower bearing housing of a vertical roll in a steel rolling mill. The lower labyrinth seal ring is fitted around the roll neck and rotates together with the inner ring of the roll and bearing. Two oil seals are installed in the same direction within the oil seal groove of the lower bearing housing cover, with their lips contacting the lower labyrinth seal ring, forming two lines of defense. A gland is installed above the lower bearing housing cover, pressing down on the two oil seals. The lower bearing housing cover also has an annular boss that extends into the groove of the lower labyrinth seal ring, forming a non-contact labyrinth seal. Firstly, the labyrinth seal, as the first line of defense, prevents most of the iron oxide and cooling water from entering the bearing housing. The small amount of iron oxide scale and cooling water that passes through the labyrinth seal is further blocked by the two oil seals, thus protecting the bearing in the lower bearing housing. However, although the boss on the lower bearing housing is relatively high and forms a labyrinth seal with the lower labyrinth seal ring, the water pressure of the descaling device behind the vertical roll mill frame is very high, and a lot of iron oxide scale is removed from the surface of the steel. Therefore, iron oxide scale and pressurized water often bypass the labyrinth seal, pass through the sealing ring, and reach the bearing, damaging the bearing's working environment. In severe cases, it can burn out the bearing, causing shutdowns and increasing the steel rolling costs for steel companies. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a multi-seal device for the lower bearing housing of the vertical roll of a steel rolling mill that can effectively prevent iron oxide scale and cooling water from entering the bearing housing, thereby effectively ensuring the continuous and safe operation of the vertical roll mill.

[0005] To solve the above-mentioned technical problems, this utility model provides a multi-seal device for the lower bearing seat of a vertical roll in a steel rolling mill. The device is located between the lower end of the vertical roll and the upper end of the lower bearing seat. It includes a lower labyrinth sealing ring fitted around the roll neck and a lower bearing seat cover fixed to the lower bearing seat by screws. Two oil seals that can form a dynamic seal with the lower labyrinth sealing ring are press-fitted onto the lower bearing seat cover via a pressure cap. The lower bearing seat cover also has an annular boss that extends into the groove of the lower labyrinth sealing ring to form a non-contact labyrinth seal. The device is characterized in that an annular inner rubber sealing ring that extends into the groove of the lower labyrinth sealing ring and forms a dynamic seal with the inner surface of the groove is fixed on the outer circumference below the annular boss via a first clamping steel band.

[0006] Furthermore, the inner rubber sealing ring includes a lower first mounting part and an upper first protective part. An annular first steel strip groove is formed on the outer side of the first mounting part. The first clamping steel strip is located in the first steel strip groove. The outer side of the end of the first protective part has a first sealing lip. The inner rubber sealing ring contacts the inner hole surface of the groove of the lower labyrinth sealing ring through the first sealing lip on the outer side of the end of the first protective part and forms a dynamic sealing fit.

[0007] As an improvement of this utility model, a mounting base is also fixed on the cover of the lower bearing seat. An outer rubber sealing ring that can form a dynamic sealing fit with the outer circumferential surface of the lower labyrinth sealing ring is fixed on the outer circumference of the upper end of the mounting base by a second clamping steel band.

[0008] Furthermore, the mounting base has an L-shaped cross-section, and the bottom of the L-shaped mounting base is fixed to the lower bearing housing cover by the screws.

[0009] Furthermore, the outer rubber sealing ring includes a lower second mounting part and an upper second protective part. An annular second steel strip groove is formed on the outer side of the second mounting part. The second clamping steel strip is located in the second steel strip groove. The inner side of the end of the second protective part has a second sealing lip. The outer rubber sealing ring contacts the outer circumferential surface of the lower labyrinth sealing ring through the second sealing lip on the inner side of the end of the second protective part and forms a dynamic sealing fit.

[0010] Furthermore, three sealing lines are provided on the inner circumference of the second mounting part.

[0011] This utility model has the following beneficial technical effects: The use of an inner and outer double-seal protection line formed by an inner rubber sealing ring, an outer rubber sealing ring, and a lower labyrinth sealing ring greatly improves the sealing and protection capability of the bearing housing, preventing accidents such as bearing burnout caused by iron oxide and cooling water entering the bearing housing, significantly extending the bearing's service life, and ensuring the normal operation of the main equipment; the technical feature of steel strip grooves in the mounting parts of both the inner and outer rubber sealing rings makes it less likely for the tightened steel strip to come loose when installed in the grooves; and the technical feature of three sealing lines on the inner circumference of the mounting part of the outer rubber sealing ring ensures that the three sealing lines contact the mounting base line under the tightening action of the outer steel strip, resulting in a better static sealing effect. Attached Figure Description

[0012] The present invention will now be described in further detail with reference to the accompanying drawings.

[0013] Figure 1 This is a diagram of the sealing structure of the lower bearing housing of the vertical roll in a steel rolling line in the existing technology.

[0014] Figure 2 This is an installation diagram of a multi-seal device for the lower bearing seat of a vertical roll in a steel rolling mill, according to this utility model.

[0015] Figure 3 This is a cross-sectional schematic diagram of the inner rubber sealing ring in this utility model.

[0016] Figure 4 This is a cross-sectional schematic diagram of the outer and inner rubber sealing rings in this utility model. Detailed Implementation

[0017] See Figure 2 - Figure 4This utility model discloses a multi-seal device for the lower bearing seat of a vertical roll in a steel rolling mill. The device is positioned between the lower end of the vertical roll 91 and the upper end of the lower bearing seat 92. The lower bearing seat contains a bearing, which includes an outer bearing ring 93 and an inner bearing ring 94. The multi-seal device includes a lower labyrinth sealing ring 1 fitted onto the neck of the vertical roll and a lower bearing seat cover 3 fixed to the lower bearing seat by screws 2. Two oil seals 5, which can form a dynamic seal with the lower labyrinth sealing ring, are press-fitted onto the lower bearing seat cover by a pressure cap 4. An annular boss 7, extending into the groove 6 of the lower labyrinth sealing ring and forming a non-contact labyrinth seal with the lower labyrinth sealing ring, is also connected to the lower bearing seat cover. The device is characterized in that an annular inner rubber sealing ring 72, extending into the groove 6 of the lower labyrinth sealing ring and forming a dynamic seal with the inner surface of the groove, is fixed on the outer circumference below the annular boss 7 by a first clamping steel band 71. The inner rubber sealing ring 72 includes a lower first mounting part 721 and an upper first protective part 722. An annular first steel strip groove 723 is formed on the outer side of the first mounting part. The first clamping steel strip 71 is located within the first steel strip groove. The outer side of the end of the first protective part has a first sealing lip 724. The inner rubber sealing ring contacts the inner hole surface of the groove of the lower labyrinth sealing ring through the first sealing lip on the outer side of the end of the first protective part, forming a dynamic sealing fit. A mounting base 8 is also fixed on the lower bearing seat cover 3. An outer rubber sealing ring 82, which can form a dynamic sealing fit with the outer circumferential surface of the lower labyrinth sealing ring 1, is fixed on the outer circumference of the upper end of the mounting base by a second clamping steel strip 81. The mounting base 8 has an L-shaped cross-section, and the bottom of the L-shaped mounting base is fixed to the lower bearing seat cover 3 by the screw 2. The outer rubber sealing ring 82 includes a lower second mounting portion 821 and an upper second protective portion 822. An annular second steel strip groove 823 is formed on the outer side of the second mounting portion. The second clamping steel strip 81 is located within the second steel strip groove. A second sealing lip 824 is provided on the inner side of the end of the second protective portion. The outer rubber sealing ring contacts the outer circumferential surface of the lower labyrinth sealing ring 1 through the second sealing lip on the inner side of the end of the second protective portion, forming a dynamic sealing fit. Three sealing lines 825 are provided on the inner circumference of the second mounting portion 821.

[0018] It is understood that the above specific description of the present utility model is only used to illustrate the present utility model and is not limited to the technical solutions described in the embodiments of the present utility model. Any modifications or equivalent substitutions to the present utility model to achieve the same technical effect are within the protection scope of the present utility model.

Claims

1. A multi-seal device for the lower bearing seat of a vertical roll in a steel rolling mill, disposed between the lower end of the vertical roll (91) and the upper end of the lower bearing seat (92), comprising a lower labyrinth sealing ring (1) sleeved on the neck of the vertical roll and a lower bearing seat cover (3) fixed to the lower bearing seat by screws (2), wherein two oil seals (5) are press-fitted on the lower bearing seat cover by a pressure cap (4) to form a dynamic seal with the lower labyrinth sealing ring, and the lower bearing seat cover is also connected to an annular boss (7) extending into the groove (6) of the lower labyrinth sealing ring to form a non-contact labyrinth seal, characterized in that: An annular inner rubber sealing ring (72) is fixed on the outer circumference below the annular boss (7) by a first clamping steel band (71) and extends into the groove (6) of the lower labyrinth sealing ring and forms a dynamic sealing fit with the inner hole surface of the groove.

2. The multi-seal device for the lower bearing seat of the vertical roll of a steel rolling mill as described in claim 1, characterized in that: The inner rubber sealing ring (72) includes a lower first mounting part (721) and an upper first protective part (722). An annular first steel strip groove (723) is formed on the outer side of the first mounting part. The first clamping steel strip (71) is located in the first steel strip groove. The outer side of the end of the first protective part has a first sealing lip (724). The inner rubber sealing ring contacts the inner hole surface of the groove of the lower labyrinth sealing ring through the first sealing lip on the outer side of the end of the first protective part and forms a dynamic sealing fit.

3. The multi-seal device for the lower bearing seat of the vertical roll of a steel rolling mill as described in claim 1, characterized in that: An mounting base (8) is also fixed on the lower bearing housing cover (3). An outer rubber sealing ring (82) that can form a dynamic sealing fit with the outer circumference of the lower labyrinth sealing ring (1) is fixed on the outer circumference of the upper end of the mounting base by a second clamping steel band (81).

4. The multi-seal device for the lower bearing seat of the vertical roll of a steel rolling mill as described in claim 3, characterized in that: The mounting base (8) has an L-shaped cross section, and the bottom of the L-shaped mounting base is fixed to the lower bearing seat cover (3) by the screw (2).

5. The multi-seal device for the lower bearing seat of the vertical roll of a steel rolling mill as described in claim 3, characterized in that: The outer rubber sealing ring (82) includes a lower second mounting part (821) and an upper second protective part (822). An annular second steel strip groove (823) is formed on the outer side of the second mounting part. The second clamping steel strip (81) is located in the second steel strip groove. The inner side of the end of the second protective part has a second sealing lip (824). The outer rubber sealing ring contacts the outer circumferential surface of the lower labyrinth sealing ring (1) through the second sealing lip on the inner side of the end of the second protective part and forms a dynamic sealing fit.

6. The multi-seal device for the lower bearing seat of the vertical roll of a steel rolling mill as described in claim 5, characterized in that: The second mounting part (821) has three sealing lines (825) on its inner circumference.

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