JPH10274247A - Bearing box and foot roll segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simply structured and light bearing box having a suffi cient cooling effect by providing a plurality of grooves in the partial outer peripheral high heat load side of a bearing housing, a cooling water flow-in hole corresponding to the groove and a cap covering the groove. SOLUTION: A SUS 304 is used for a bearing housing 1, a SUS 310 is used for a cap 3 and two grooves 2 are provided and these grooves are machined in positions above a bearing groove. For a flow-in hole 4, for forming round holes from the inside of each groove 2 and the outside of the groove 2 and communicating these holes from a direction vertical to the holes, round holes are formed from a lower side to an upper side and two cooling water passages are provided by burying the lower side hole. Also, for the flow-in hole 4, a tap is cut to provide a female screw, a cooling water supply pipe side is used as a male screw, two flow-out holes 5 are provided in the cap 3, machined in a shape matching the outer periphery of the bearing housing 1 and then the full periphery of the cap 3 is full-welded to the bearing housing 1 to be used as a bearing box. Thus, good bearing cooling capacity is provided in the bearing, a structure is simplified and a weight is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing box with a cooling function for preventing bearing damage in a bearing, and more particularly to a bearing box for a foot roll segment device in a continuous casting facility.

[0002]

2. Description of the Related Art As shown in FIG. 7, a continuous casting facility is a facility in which molten steel is put into a mold called a mold, solidifies continuously while cooling, and is drawn out as a slab. The molten steel is externally cooled into a slab in a primary cooling zone that cools the mold section in the continuous casting facility and a secondary cooling zone formed by air / water that mixes water and air. At this time, the slab is pulled out via a foot roll, a guide roll, and a pinch roll.

[0003] Here, a foot roll segment attached immediately below a mold as a primary cooling zone is a structure in which a long foot roll and a short foot roll are connected by a foot roll bearing box, and a slab is guided from both sides. Has become. In the slab state near the foot roll segment, since the outer solidified portion of the slab is still very thin and most of the molten steel inside is unsolidified, the shape of the foot roll in contact with the slab has a large effect on the slab surface shape. For this reason, the foot roll diameter is reduced to reduce the roll pitch, and if a single roll is rolled, the roll is curved, so that the rolls are divided and connected by a bearing box.

As shown in FIGS. 5 and 6, the foot roll contacts the slab surface and rotates as the slab is withdrawn and moved. The long and short foot rolls are supported by the rolling bearings on both sides and rotate. On the other hand, since the slab is located almost at the center of the slab, the radiant heat from the slab is large and the heat load is the largest. For this reason, conventionally, a plurality of grooves were machined on the surface of the foot roll bearing box in order to increase the cooling surface area, and the bearing box was cooled by external cooling with air and water.

Another prior art is disclosed in Japanese Patent Application Laid-Open No. 8-16 / 1996.
There is also one in which a cooling water passage is provided in a bearing housing as disclosed in JP-A-8859.

[0006]

However, in the former conventional cooling method using external cooling, the cooling effect of the foot roll bearing box which continuously and directly receives the radiant heat of the high-temperature slab is insufficient, and the grease seal for bearing lubrication is not provided. There is a danger that the bearing may be damaged, causing damage to the bearing, causing flaws on the slab surface, or causing breakage of the molten steel due to poor rotation of the foot roll.

In the latter bearing housing described in Japanese Patent Application Laid-Open No. H8-168859, bearing damage can be prevented to some extent, but it is necessary to form a cooling water passage in the bearing housing. In addition, it is necessary to provide a certain thickness on both the outer peripheral side and the bearing side because the cooling water passage is provided inside, and the bearing housing itself has to be large, and the weight is also reduced. It was heavy.

Therefore, an object of the present invention is to provide a bearing housing having a sufficient cooling effect, a simple structure and a light weight. The invention according to claim 2 is
In addition to the object of the first aspect of the present invention, it is possible to quickly perform a repair work such as a roll exchange or the like for attaching and detaching a bearing housing and a cooling water pipe. Another object of the present invention is to provide a foot roll segment that does not cause a flaw on the slab surface and that can prevent breakout.

[0009]

In order to achieve the above object, the invention according to claim 1 provides a plurality of grooves on a high heat load side of a part of the outer peripheral surface of a bearing housing, and cooling water corresponding to the grooves. And a lid covering the groove.

Further, according to a second aspect of the present invention, in the configuration of the first aspect, the inflow hole penetrates the inside of the bearing housing with a screw hole and is connected to the groove, and the outflow hole is provided in the lid. The groove is sealed by welding the entire circumference of the lid to the bearing housing.

According to a third aspect of the present invention, there is provided a bearing box according to the first or second aspect, provided immediately below a mold of a continuous casting facility, between a long foot roll and a short foot roll for guiding and moving a slab, and It is used for a rolling bearing that rotatably supports two shafts of the long and short foot rolls that directly receive the radiant heat of the slab.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below. A plurality of grooves for flowing cooling water are provided on the high heat load side of a part of the outer peripheral surface of the bearing housing. Although the shape of the groove is not particularly specified, a groove which is located on the bearing groove in the bearing housing and is as deep as the bearing strength allows is preferred because the bearing cooling effect is large. Next, an inflow hole for connecting the cooling water supply pipe may be provided in the lid, but since connection strength of the cooling water supply pipe is required, it is preferable to provide the cooling water supply pipe in the bearing housing through the groove. In addition, it is possible to facilitate attachment and detachment of the cooling water supply pipe by using a thread.

On the other hand, the lid is provided with the same number of outflow holes as the number of grooves at a position above the groove at the end of the lid opposite to the inflow hole. Then, the entire periphery of the lid is welded to the bearing housing to seal the groove. Alternatively, the lid may not be provided with an outflow hole, and the end of the groove may be opened to be welded and sealed. By configuring the bearing housing as described above, the cooling water flows through the groove in the lid to cool the bearing, and then flows out of the outflow hole and flows down the lid surface to cool the bearing housing again with heat of vaporization. The cooling capacity is improved.

Next, a third aspect of the present invention relates to the first aspect.
Or the bearing box according to 2 above, provided between the long foot roll and the short foot roll for guiding and moving the slab, the two shafts of the long and short foot rolls which directly receive the radiant heat of the glowing slab. Used for rolling bearings that are rotatably supported. It should be noted that the bearings at both ends may be used. However, since both ends have a small heat load, a conventional bearing box having a small cooling effect may be used.

As shown in FIG. 3, the foot roll segment of the present invention is mounted laterally on a vertical foot roll support frame, so that the outflow hole of the bearing box is located on the upper side, and cooling water flows down the lid surface. In particular, the cooling effect can be improved. In other words, the cooling water on the lid surface is easily evaporated by the radiant heat from the slab surface, and the surroundings are cooled by the heat of vaporization. Good bearing cooling efficiency in the housing.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view of a bearing housing 1 of the present invention, and FIG. 2 is a perspective view of a lid 3 portion according to one embodiment. FIG. 3 is a perspective view when the present invention is attached to the foot roll support frame 7, and FIG. 4 is a perspective view of a main part showing a foot roll segment when viewed from the inside of the mold 8.

In the bearing housing of the present invention, the bearing housing 1 is
US304 and lid 3 were manufactured using SUS310 having a thickness of 2 mm. As shown in FIG. 1, the number of grooves 2 was two, and processing was performed at a position corresponding to the bearing 10 grooves. The inflow hole 4 is formed by drilling a round hole from the lower side to the upper side so as to communicate with holes inside and outside the groove from a direction perpendicular to the hole, Were backfilled to form two cooling water passages. Also, the tap of the inflow hole 4 was a female screw, and the cooling water supply pipe 6 side was a male screw. The lid 3 was provided with two outflow holes 5 as shown in FIG. 2, processed into a shape along the outer periphery of the bearing housing 1, and the entire periphery of the lid 3 was entirely welded to the bearing housing 1 to form a bearing box.

As a result of using the bearing box manufactured as described above as a center foot roll bearing box 9c of the foot roll segment 9 shown in FIG. 4 in a continuous casting apparatus, as compared with the conventional external cooling system, a break caused by poor rotation of the foot roll occurs. The danger of out and slab surface flaws were reduced.

[0019]

Since the bearing box according to the present invention has the above-described contents, it has an excellent effect of cooling the bearing inside the bearing, and has an effect that the structure can be simplified and lightened. As described above, the invention according to claim 1 of the present invention has a structure in which the cooling water flowing in the groove flows down from the surface of the lid again, so that the double cooling effect by the heat of vaporization and the cooling water is obtained. According to the second aspect of the present invention, since the inflow hole has a screw structure, the foot roll maintenance at the time of mold replacement has an effect that the cooling water supply pipe can be quickly attached and detached. According to the third aspect of the present invention, since the bearing box having an enhanced cooling effect is applied to the foot roll segment having the highest radiant heat, stable continuous casting can be performed without occurrence of foot roll rotation failure and the like, and the slab surface can be obtained. There is an effect that generation of flaws and breakout of molten steel can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view of a bearing housing of the present invention.

FIG. 2 is a perspective view of a lid portion according to one embodiment of the present invention.

FIG. 3 is a partial perspective view showing a cooling mechanism when the present invention is attached to a foot roll support frame.

FIG. 4 is a main part perspective view showing a foot roll segment as viewed from the inside of the mold.

FIG. 5 is a cross-sectional view of a main part illustrating a relationship between a foot roll bearing box and a slab.

FIG. 6 is a sectional view taken along line AA of FIG.

FIG. 7 is a schematic diagram of a continuous casting facility showing installation locations of foot roll segments.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 bearing housing 2 groove 3 lid 4 inflow hole 5 outflow hole 6 cooling water supply pipe 7 foot roll support frame 8 mold 9 foot roll (foot roll segment) 9 a long foot roll 9 b short foot roll 9 c foot roll bearing box 10 bearing 11 tundish 12 guide roll 13 Pinch roll 14 slab

Claims (3)

[Claims] 1. A plurality of grooves (2) in a part of the outer peripheral surface of a bearing housing (1) and an inflow hole (4) corresponding to the grooves (2).
A bearing box comprising: an outlet hole (5); and a lid (3) covering the groove (2). 2. An inflow hole (4) is threaded through the bearing housing (1) and connected to the groove (2), an outflow hole (5) is provided in the lid (3), and the lid (3) is provided. 2. The bearing housing according to claim 1, wherein the groove (2) is sealed by welding the entire circumference of (3) to the bearing housing (1). 3. The bearing box according to claim 1, which is provided immediately below a mold (8) of a continuous casting facility, and wherein the slab (1) is provided.
4) between the long foot roll (9b) and the short foot roll (9a) for guiding and moving the red hot slab (1).
The long and short foot roll (9) which directly receives the radiant heat of 4).
A foot roll segment used for a rolling bearing that rotatably supports the two shafts.