JP2019143678A - Bearing seal structure of table roller for transportation of steel material, bearing sealing method, and steel material manufacturing method, and rolling facility - Google Patents

Abstract

To provide a bearing seal structure which can easily extend continuous use of a table roller for transportation of a sheet material, and to provide a sheet material manufacturing method using the bearing seal structure.SOLUTION: A bearing seal structure is used to seal oil leakage of a lubrication oil supplied to a bearing 5A supporting a journal part 4 of a transfer roll 2A forming a table roller 2 for transport of a steel material to the roll side. The bearing seal structure includes: a retainer 20 having a facing surface facing the journal part 4 in a radial direction of the journal part 4; a gland packing 21 disposed between the journal part 4 and the facing surface of the retainer 20; and packing pressing jig 22 which presses the gland packing 21.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a technology of an apparatus for manufacturing a steel material, and more particularly to a technology around a bearing that supports a transport roll that constitutes a steel material transport table roller that transports the steel material in a rolling facility or the like.

The steel material transport table roller is a device that transports a steel material such as a slab or a steel plate to a next process in a steel material manufacturing facility. For example, in steel plate table rollers used in thick plate rough rolling equipment and other rolling equipment, grease and other lubricating oil are supplied to the bearing for lubricating the bearing, and the lubricating oil supplied to the bearing is sealed. In order to achieve this, an oil seal is used (see Patent Document 1).
Here, in the case of the steel material transport table roller, when the oil seal is worn, the roller is temporarily taken out to replace the oil seal.

JP 2000-27873 A

When a sealing structure using an oil seal is adopted, wear occurs at the sealing position of the table roller shaft (journal part) supported by the bearing, and oil leakage occurs as the wear (groove) increases. Further, due to wear of the bearing housing due to aging, the journal portion of the table roller is inclined, and oil leakage is accelerated to promote shaft wear due to generation of a seal gap and an increase in load of the seal sliding portion.
Replace the ring-shaped oil seal as appropriate and continue sealing the lubricating oil.However, if there is more than a specified amount of wear on the surface of the journal that contacts the seal, the specified oil seal can seal the oil leak. Disappear. When such a large amount of wear has occurred on the seal surface of the journal part, conventionally, the transport roll in which the journal part has been worn is removed, and for example, the wear part (groove) on the surface of the journal part is overlaid. By repairing, the life of the transport roll is extended. However, overlay welding has a problem that it takes time and effort.
The present invention has been made paying attention to the above points, and provides a bearing seal structure capable of easily extending the continuous use of a steel material conveying table roller, and a method of manufacturing a steel material using the same. Objective.

In order to solve the problem, the bearing seal structure according to one aspect of the present invention seals oil leakage to the roll side of the lubricating oil supplied to the bearing that supports the journal portion of the transport roll constituting the steel material transport table roller. A retainer having a facing surface facing the journal portion in a radial direction of the journal portion, and a gland packing interposed between the journal portion and the facing surface of the retainer. And a packing pressing jig for pressing the gland packing.
Moreover, the sealing method which is one aspect of the present invention is a sealing method for sealing oil leakage to the roll side of the lubricating oil supplied to the bearing that supports the journal portion of the transport roll constituting the steel material transport table roller. Then, if the oil leak is sealed with an oil seal and it is determined that sealing with the oil seal is difficult, the gist is to apply the bearing seal structure.

According to one aspect of the present invention, it is possible to provide a sealing structure and a sealing method for a bearing seal portion that can easily extend the continuous use of a steel material transport table roller.
As a result, according to one aspect of the present invention, the continuous use of the steel material transporting table roller can be extended easily and in a short time, thereby improving the continuous operation rate in the steel material manufacturing facility employing the steel material transporting table roller. It becomes possible to do.

It is the schematic explaining the rolling equipment which concerns on embodiment based on this invention. It is the schematic explaining the bearing seal structure by an oil seal. It is the schematic explaining the bearing seal structure by a gland packing.

Next, embodiments of the present invention will be described with reference to the drawings.
In the present embodiment, a steel material transport table roller 2 (hereinafter also simply referred to as a table roller 2) used in a rolling facility for rolling a steel plate 1 as a steel material with a rolling mill 10 as shown in FIG. 1 is assumed. I will explain.

(Construction)
In the rolling equipment, while the steel plate 1 is conveyed by the table roller 2, the steel plate 1 is sequentially rolled by a one-stage or multi-stage rolling mill 10, and the rolled steel sheet is conveyed to the next step.
The table roller 2 includes a plurality of transport rolls 2A arranged along the pass line.
Each conveyance roll 2A has a roll body portion 3 that is a portion in contact with the steel plate 1 and a journal portion 4 that is a table roller shaft extending in the left-right direction. As shown in FIG. 2 or 3, the journal portion 4 is rotatably supported by a bearing 5 </ b> A of the bearing device 5. The bearing device 5 includes a bearing 5A and a bearing box 5B.
The bearing 5A is disposed between the journal portion 4 and the inner diameter side of the bearing housing 5B. The bearing 5A includes, for example, an outer ring fixed to the bearing housing 5B, an inner ring fixed to the journal portion 4, and a rolling element such as a roller interposed between the outer ring and the inner ring arranged concentrically. . Lubricating oil is supplied (supplied) to the bearing 5A constantly or periodically from an oil supply hole (not shown) for lubrication.
Further, the opening on the side of the transport roll 2A of the bearing box 5B is sealed with a sealing device to seal the lubricating oil supplied to the bearing 5A.
FIG. 2 illustrates the case where the sealing device has an oil seal structure, and FIG. 3 illustrates the case where the sealing device has a gland packing structure.

<When the seal device has an oil seal structure>
As shown in FIG. 2, the seal structure by the oil seal 7 includes a retainer 6 and a ring-shaped oil seal 7.
The retainer 6 is disposed on the outer diameter side of the journal portion 4, and an annular inner diameter surface is disposed coaxially with the journal portion 4. The retainer 6 is detachably attached to the bearing box 5B by bolts 8. A ring-shaped seal mounting groove is formed on the inner diameter surface of the retainer 6. In FIG. 2, the case where there are two seal mounting grooves is illustrated. An oil seal 7 made of an O-ring (O-ring) is attached to each seal mounting groove, and the lip portion on the inner diameter side of the oil seal 7 is in contact with the journal portion 4. The lip portion is urged against the surface of the journal portion 4 by a ring-shaped spring component. That is, the lip portion comes into contact with the surface of the journal portion 4 with the set seal pressure by the elastic force of the lip portion and the elastic force of the ring-shaped spring component.
In the case of a seal structure with the oil seal 7, when replacing the oil seal 7, the transport roll 2 </ b> A is taken out, the retainer 6 is removed and the oil seal 7 is replaced, and then the transport roll 2 </ b> A is again connected to the table roller 2. Install it on the frame.

<When the seal structure is a gland packing structure>
As shown in FIG. 3, the seal structure by the gland packing 21 includes a retainer 20, a gland packing 21, and a packing pressing jig 22.
The retainer 20 is disposed on the outer diameter side of the journal portion 4, and an annular inner diameter surface is disposed coaxially with the journal portion 4. The retainer 20 is detachably attached to the bearing box 5B with bolts.
A gland packing 21 is inserted from the axial direction into a stuffing box formed by a gap between the inner diameter surface of the retainer 20 and the surface of the journal portion 4. The gland packing 21 in the stuffing box is tightened in the axial direction by a bolt 23 with a bolt 23, so that the gland packing 21 generates a force that presses the surface of the journal portion 4. Seal leaks.

  What is necessary is just to use what is generally distribute | circulating the gland packing 21. For example, for a gland packing, for example, a packing (equivalent to VALQUA No. 8132), which is obtained by treating a spun yarn of an aramid fiber and an artificial inorganic fiber with a PTFE dispersion, braiding it into a square cross section, and flexibly finishing it with a PTFE dispersion and a lubricating oil. Can be used. Use of a softly finished gland packing is preferable because the adhesion of the shaft wear portion (groove) can be improved.

Then, the tightening force by the packing pressing jig 22 is appropriately adjusted with the bolts 23 to suppress oil leakage from the gland packing 21 to a predetermined level or less. When oil leakage exceeding a threshold value is detected during maintenance, the packing holding jig 22 is removed, the gland packing 21 is replaced, and the packing holding jig 22 is tightened again for use. The tightening amount is determined in consideration of the sliding resistance due to the packing and the amount of oil leakage.
When the gland packing 21 is replaced, the packing can be replaced simply by shifting the packing holding jig 22 in the axial direction. Therefore, it is not necessary to move the transport roll 2A as compared with the replacement of the oil seal 7. The replacement can be performed easily and in a short time without being overwhelmed.

  Here, the gland packing 21 is not a ring-shaped (endless annular) integral, but a rod-shaped (string-shaped) shape, which is rounded into a ring shape and inserted into the gap. For this reason, the packing can be replaced without completely removing the packing pressing jig 22. In addition, the inserted gland packing 21 has a multi-packing structure such as three or four stages to prevent leakage, and the connection positions at each stage are prevented from overlapping so that leakage from the connection portion is suppressed. It is done.

  The packing pressing jig 22 may be an integral annular part, but is preferably a split type that is divided into two or more in the circumferential direction, such as two or three. For example, the packing holding jig 22 is preferably divided into two halves. In this case, a gland packing 21 is inserted between the journal portion 4 and the retainer 20, and a two-part packing holding jig 22 is attached to the gland packing retainer 20 with bolts 23. As described above, when the packing holding jig 22 is a split type, the gland packing can be more easily performed without removing the roll for the conveyance roll from the conveyance table equipment and even if the work space in the axial direction is small. 21 can be exchanged. The retainer 20 may also have a half structure, but it is preferable that the retainer 20 is an integral member in order to generate the same seal pressure in the entire circumferential direction.

(Application example of bearing 5A sealing)
An application example of the bearing seal structure of the table roller 2 will be described.
A seal structure by the gland packing 21 may be applied from the initial state to seal the oil leakage to the roll side of the lubricating oil supplied to the bearing 5A that supports the journal portion 4 of the transport roll 2A.
However, when the oil seal 7 and the gland packing 21 are compared, the oil seal 7 has higher sealing performance, a smaller sealing surface (contact area), and lower sliding resistance.

For this reason, in an example of this embodiment, in the initial state, a seal structure (see FIG. 2) by the oil seal 7 is applied, and when the oil leakage exceeds a predetermined value, the oil seal 7 is replaced and supplied to the bearing 5A. Oil leakage to the roll side of the lubricating oil is sealed.
If it is determined that wear (groove) due to seal contact is formed on the journal part 4 so that it is determined that sealing is difficult by replacement of the oil seal 7, instead of repairing the welded part by overlay welding, Change to seal structure with packing 21.

Since the gland packing 21 has a larger seal width than the oil seal 7, the gland packing 21 can be applied even if wear (grooves) that are not supported by the oil seal 7 are formed in the journal portion 4, and can be applied by overlay welding. The table roller 2 can be used continuously in a shorter time than this. That is, the stop time of the rolling operation can be shortened, and the reduction in productivity can be suppressed accordingly.
In addition, the seal by the gland packing 21 is in a state where the sealing performance is lower than the seal by the oil seal 7 and a slight oil leakage is allowed. However, the oil leakage can be appropriately adjusted by adjusting the tightening by the packing holding jig 22. Can be reduced.

Here, 200 or more transport rolls of the table roller 2 used in the thick plate rough rolling equipment are used although it depends on the size of the equipment. It is desirable that maintenance is easy.
In particular, for the transport roll in the vicinity of the rolling mill, when the oil seal 7 is to be replaced, it is necessary to remove the rolling maintenance parts such as a side guide that guides the steel sheet 1 to the rolling mill and to perform the work by taking out the roll 2A. Work becomes big.

In this embodiment, by adopting sealing (sealing) with the oil seal 7 as much as possible, wear of the seal position of the journal portion 4 is promoted, and the groove expands in the width direction. When the use becomes impossible, in order to continue using the roll that has reached the use limit, the gland packing is used so as to seal the seal width of the shaft wear part or more (for example, the width of 3 mm or more). Accordingly, even when groove wear occurs and wear expands in the width direction, oil leakage can be stopped by using the gland packing 21.
As a result, by adopting this embodiment, it is possible to suppress oil leakage and reduce roller replacement time, build-up welding costs, and oil purchase costs.
Here, it has been confirmed that the seal structure by the oil seal 7 can be adopted for 10 years or more, and even when the gland packing 21 is used, the replacement interval of the gland packing 21 can be set to 1 year or more.

In addition, about the sealing structure by the oil seal 7, the seal position by the oil seal 7 is made into an axial direction by shifting the axial direction position of the retainer 6 by inserting a shim etc. between the bearing housing 5B and the retainer 6. The part that is shifted and not worn may be sealed with the oil seal 7. In this case, the sealing period by the oil seal 7 can be lengthened.
Moreover, in the said description, although the table roller 2 used by rolling equipment was demonstrated to the example, if this is a table roller 2 used in the location which conveys steel materials for steel materials manufacture, this embodiment is applicable. It is.

DESCRIPTION OF SYMBOLS 1 Steel plate 2 Steel roller table roller 2A Conveying roll 4 Journal part 5 Bearing device 5A Bearing 5B Bearing box 6 Retainer 7 Oil seal 8 Bolt 10 Rolling machine 20 Retainer for gland packing 21 Gland packing 22 Packing pressing jig 23 Bolt

Claims (5)

A bearing seal structure for sealing oil leakage to the roll side of lubricating oil supplied to a bearing supporting a journal portion of a transport roll constituting a steel material transport table roller,
A retainer having an opposing surface facing the journal part in the radial direction of the journal part;
A gland packing interposed between the journal part and the opposing surface of the retainer;
A packing holding jig for holding the gland packing;
A bearing seal structure for a steel material transporting table roller.   The bearing seal structure for a steel material conveying table roller according to claim 1, wherein the packing pressing jig is a split type divided into two or more in the circumferential direction. A sealing method for sealing oil leakage to the roll side of lubricating oil supplied to a bearing supporting a journal part of a transport roll constituting a steel material transport table roller,
Sealing the bearing, wherein the oil leakage is sealed with an oil seal, and if it is determined that sealing with the oil seal is difficult, the bearing seal structure according to claim 1 or 2 is applied. Method. In a steel material manufacturing method for manufacturing a steel material,
It has rolling equipment that rolls while transporting steel with a steel material transport table roller,
The method for sealing a bearing according to claim 3 is used in order to seal the oil leakage to the roll side of the lubricating oil supplied to the bearing supporting the journal portion of the transport roll constituting the steel material transport table roller. Steel manufacturing method. A rolling facility that performs rolling while conveying a steel material with a steel material conveying table roller,
The bearing seal structure for sealing the oil leakage to the roll side of the lubricating oil supplied to the bearing which supports the journal part of the conveyance roll which comprises the said steel material conveyance table roller, The Claim 1 or Claim 2 Rolling equipment that employs a bearing seal structure.

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