Title of the invention: Bearing box of rotating roll for transporting high temperature objects
Technical field
[0001]
The present invention relates to a bearing box of a rotary roll that conveys a high temperature object, such as a slab support roll that conveys a high temperature slab in a continuous casting machine.
Background technology
[0002]
Continuous casting is a solidification process in which molten steel whose composition and temperature have been adjusted in the refining process is continuously cooled and solidified into slabs of a certain size and shape. The segment roll installed in the segment frame plays the role of a guide when pulling out.
[0003]
As shown in FIG. 7, the segment roll 33 installed in the segment frame 31 has a split roll in which 2 to 4 rolls 35 are arranged in the axial direction, and each roll 35 constituting the split roll 35. Is supported by a bearing portion provided in the bearing box 37. The segment roll 33 has a structure in which a plurality of pairs of upper and lower split rolls are arranged.
[0004]
The bearing box 37 for supporting each roll 35 in the segment roll 33, and the bearing portion, the sealing portion, the lubricating oil or the lubricating grease inside the bearing box 37 are in contact with or adjacent to the slab being cast, and are in a high temperature environment. Being exposed to. The bearing portion, particularly the bearing portion of the bearing box 37 arranged on the central side of the segment frame 31, has problems such as poor rotation due to lubrication carbonization, damage to the bearing portion, and hardening of the seal portion.
[0005]
To solve such a problem, in Patent Document 1, a plurality of grooves are formed on the outer periphery of the bearing box, cooling water is introduced from the inflow hole at one end, and the outflow hole at the other end is opened to flow in the groove. By letting the cooling water flow down from the surface of the bearing box lid again, the cooling effect of the inside of the bearing box due to the cooling water flowing through the groove and the outside of the bearing box due to the heat of vaporization when the cooling water flows down from the lid and vaporizes. The method of obtaining is proposed.
[0006]
Further, Patent Document 2 proposes a method of cooling by air from the outside in a roller table for transporting a slab.
[0007]
Further, in Patent Document 3, in a roll segment device for guiding a slab of a continuous casting machine, casting is performed so that the thickness of the slab to be cast does not deteriorate due to heat generated by the roll constituent members due to the radiant heat of the slab. It is disclosed that water is sprinkled on the roll segment based on the surface observation of the piece.
Prior art literature
Patent documents
[0008]
Patent Document 1: Japanese Unexamined Patent Publication No. 10-274247
Patent Document 2: Japanese Patent Application Laid-Open No. 2003-290891
Patent Document 3: Japanese Unexamined Patent Publication No. 2010-23061
Outline of the invention
Problems to be solved by the invention
[0009]
However, in the method disclosed in Patent Document 1, due to the feature that the cooling water is discharged to the outside of the bearing box to obtain the external cooling effect by the heat of vaporization, the externally discharged water is applied to the slab, which causes supercooling of the slab. There are concerns.
[0010]
Further, the method disclosed in Patent Document 2 has a problem that the heat removal effect is small by cooling with air and the bearing box cannot be cooled uniformly. In particular, for bearings arranged on the center side of the segment, it is difficult to uniformly blow cooling air to the portion that receives radiant heat from the slab.
[0011]
Further, Patent Document 3 describes that water is sprinkled on the roll segment, but the detailed watering method is insufficiently described and is not reproducible, and effective cooling of the bearing box may be realized. It is unknown.
[0012]
As mentioned above, none of Patent Documents 1 to 3 has realized effective cooling of the bearing box.
[0013]
As the most common method for cooling a bearing box in the past, in addition to the external cooling effect of the bearing box by the slab cooling water for cooling the slab, the bearing is as disclosed in Patent Document 1 above. A water-cooled jacket is installed in the box.
[0014]
FIG. 8 shows the cooling structure of the bearing box 37 using such a conventional general water-cooled jacket. In FIG. 8, 33 is a segment roll, 37 is a bearing box that rotatably supports the shaft of the segment roll 33, 39 is a bearing portion provided in the bearing box 37, 41 is a seal portion, 43 is a retainer, and 45 is mainly. The cooling water passage through which the cooling water for cooling the bearing portion 39 flows, and 47 is a lid member for forming the cooling water passage 45.
[0015]
Conventionally, in the bearing portion 39 of the continuous casting machine, a cooling water channel 45 is formed in the bearing box 37 as described above, and the cooling water channel 45 is covered with the lid member 47 to form a water cooling jacket for cooling. However, in recent years, in the production of high-grade steel, a casting method has been implemented in which the slab cooling water is squeezed as much as possible in the curved zone upstream of casting to prevent cracking of the slab surface and corners. Along with this, the external cooling effect of the slab cooling water previously obtained is reduced, and the heat load received by the bearing box 37 and the roll 35 is increased.
[0016]
As shown by the arrow in FIG. 8, the influence of the radiant heat from the slab 49 extends not only to the bearing portion 39 but also to the seal portion 41 provided adjacent to the bearing portion 39, but in the conventional structure, this is applied. The seal portion 41 could not be cooled, and the heat load on the portion was large.
[0017]
The present invention has been made to solve such a problem, and reduces the heat load of the bearing portion and the seal portion provided adjacent to the bearing portion to have an effect of poor rotation, damage to the bearing portion, and hardening of the seal portion. It is an object of the present invention to provide a bearing box of a rotating roll that conveys a high temperature object that can be prevented.
Means to solve problems
[0018]
The means for solving the above problems are as follows.
[1] A rotary roll bearing box for transporting a high-temperature object, which has a bearing portion and a seal portion provided adjacent to the bearing portion, and is formed on the outer peripheral side of the bearing portion to allow cooling liquid to pass therethrough. A second cooling that is formed on the outer peripheral side of the seal portion on the radial inner side of the first coolant passage and the first coolant passage, and communicates with the first coolant passage to allow the cooling liquid to flow. A rotating roll bearing box for transporting high temperature objects, characterized by having a liquid passage.
[2] The total width of the first coolant passage and the second coolant passage in the axial cross section of the rotary roll of the bearing box is ½ or more of the width of the bearing box. The bearing box of the rotary roll for transporting the high temperature object according to [1].
[3] [1] or [2], characterized by having a first jacket component forming the first coolant passage and an annular second jacket component forming the second coolant passage. A rotary roll bearing box for transporting high temperature objects according to.
[4] A plurality of fixing parts for fixing the first jacket component and the second jacket component are provided at the boundary between the first coolant passage and the second coolant passage at predetermined intervals. A rotary roll bearing box for transporting a high-temperature object according to [3].
[5] The fixing component is fixed to the bottom surface of the first coolant passage, has a protruding portion protruding toward the second coolant passage side, and the first jacket component is fixed to the top surface of the fixing component. The rotary roll bearing box for transporting a high-temperature object according to [4], wherein the second jacket component is fixed to a protruding portion of the fixing component.
The invention's effect
[0019]
In the rotating roll bearing box for transporting a high-temperature object according to the present invention, the first coolant passage formed on the outer peripheral side of the bearing portion through which the cooling liquid flows and the radial inside of the first coolant passage. By having a second coolant passage which is formed on the outer peripheral side of the seal portion and communicates with the first coolant passage to allow the cooling liquid to flow, it is possible to cool not only the bearing portion but also the seal portion. The heat load on the seal portion can be reduced to effectively prevent rotation failure, damage to the bearing portion, and hardening of the seal portion.
A brief description of the drawing
[0020]
FIG. 1 is an exploded perspective view of a bearing box according to the present embodiment.
FIG. 2 is a front view of a bearing box according to the present embodiment.
FIG. 3 is a side view of the bearing box according to the present embodiment.
FIG. 4 is a rear view of the bearing box according to the present embodiment.
5 is a cross-sectional view taken along the line AA of FIG. 2. FIG.
FIG. 6 is a cross-sectional view taken along the line BB of FIG.
FIG. 7 is an explanatory diagram of a segment frame of a continuous casting machine.
FIG. 8 is an explanatory diagram of a conventional example of a bearing box provided at an end of a segment roll.
Embodiment for carrying out the invention
[0021]
Regarding the bearing box of the rotary roll for transporting the high temperature object of the present invention (hereinafter, simply referred to as “bearing box”), the bearing box 1 of the segment roll installed in the segment frame of the continuous casting machine is taken as an example, and FIGS. This will be described with reference to FIG. In addition, in FIGS. 1 to 6, the coolant passage which is a characteristic part of the present invention is mainly shown, and the bearing part 3 and the seal part 5 are shown only by the imaginary line of the alternate long and short dash line in FIG. However, these basic structures are the same as those in FIG.
[0022]
As shown in FIGS. 1 to 6, the bearing box 1 of the present embodiment has a bearing portion 3 and a seal portion 5 provided adjacent to the bearing portion 3 (see FIG. 5), and the bearing portion 3 The first coolant passage 7 formed on the outer peripheral side of the bearing and through which the cooling liquid flows, and the first coolant passage 7 formed on the outer peripheral side of the seal portion 5 radially inside the first coolant passage 7 and through which the cooling liquid flows. It has two coolant passages 9.
[0023]
The first coolant passage 7 and the second coolant passage 9 have first jacket parts 17 in each of the first coolant passage bottom 13 and the second coolant passage bottom 15 formed in the main body 11 of the bearing box 1, respectively. It is formed by installing the second jacket component 19 so as to cover it.
[0024]
As shown in FIG. 1, the first jacket part 17 is made of a semicircular plate member, and the second jacket part 19 is made of an annular member.
[0025]
On the second coolant passage 9 side of the bottom 13 of the first coolant passage, a plurality of fixing parts 21 for fixing the first jacket component 17 and the second jacket component 19 are provided at predetermined intervals. There is.
[0026]
As shown in FIGS. 1 and 5, the fixing component 21 has a protruding portion 21a protruding toward the second coolant passage 9, and the first jacket component 17 is fixed to the top surface of the fixing component 21 by welding. The second jacket component 19 is fixed to the protrusion 21a by welding.
[0027]
A water-cooled jacket structure is configured by fixing the first jacket part 17 and the second jacket part 19 by welding to form a closed structure.
[0028]
The first coolant passage 7 and the second coolant passage 9 configured as described above are in communication with each other, and as shown in FIG. 1, the coolant flowing through the first coolant passage 7 and the second coolant have a second coolant. Coolant flowing through the passage 9
Can come and go with each other.
[0029]
By communicating the first coolant passage 7 and the second coolant passage 9 in this way, the coolant is supplied to only one of the coolant passages having less resistance (in the present embodiment, the first coolant passage 7). Instead of flowing, the coolant can be made to flow evenly in both coolant passages.
[0030]
A coolant supply unit 23 and a coolant discharge unit 25 are provided at the lower part of the main body portion 11 in the bearing box 1.
[0031]
The coolant supply unit 23 is composed of a passage 27 extending upward from the lower part and branching into two branches, and each passage communicates with the first coolant passage 7 and the second coolant passage 9.
[0032]
Further, the coolant discharge unit 25 is also composed of a bifurcated passage 29 like the coolant supply unit 23, and each of the bifurcated passages 29 is connected to the first coolant passage 7 and the second coolant passage 9. Communicating.
[0033]
The sum of the width A of the first coolant passage 7 and the width B of the second coolant passage 9 in the rotary roll axial cross section of the bearing box 1, that is, the cross section AA (see FIG. 5) in FIG. 2 (A + B). Is set to 1/2 or more of the width C of the bearing box 1. The reason for setting in this way is as follows.
[0034]
The problem to be solved by the present invention is how the radiant heat from the slab heats the bearing portion 3 and the seal portion 5, so that the temperature of the bearing portion 3 rises and the bearing cannot rotate due to the burning of the lubricating oil. Is it to prevent it?
[0035]
Most of the radiant heat from the slab is infrared radiation, and infrared radiation is emitted to the members constituting the bearing portion 3 and the seal portion 5.Since the wavelength of is very small, there is no wraparound effect on obstacles. Therefore, when the direction of the slab is viewed from each part of the bearing box 1, if the slab that is bright red can be seen even a little, the slab is heated by the infrared radiation at that position.
[0036]
Therefore, in the present embodiment, the heat resistance performance of the bearing portion 3 is improved by increasing the water cooling coverage rate against infrared radiation from a high temperature object, that is, by making it 1/2 or more.
[0037]
According to the bearing box 1 of the present embodiment configured as described above, the first coolant passage 7 and the first coolant passage 7 are formed on the outer peripheral side of the seal portion 5 radially inside the first coolant passage 7. 1 By having a second coolant passage 9 that communicates with the coolant passage 7 and allows the coolant to flow, the radiant heat from the slab is completely blocked by the water-cooled jacket, and not only the bearing portion 3 but also the seal portion 5 It can suppress the temperature rise and prevent the charring of the bearing lubrication and the hardening of the seal.
[0038]
That is, the heat flux from the surface of the bearing box 1 to which the radiant heat emitted from the slab reaches to the bearing portion 3 can be reduced mainly by the coolant flowing through the first coolant passage 7, and the radiant heat emitted from the slab can be reduced. The heat flux from the surface of the bearing box 1 to which the bearing box 1 reaches to the bearing portion 3 and the sealing portion 5 of the neck of the rotary roll is reduced by the coolant flowing through the second coolant passage 9, and the effective heat load is reduced. Reduction is being attempted.
[0039]
In the examples shown in FIGS. 1 to 6, the coolant supply unit 23 and the coolant discharge unit 25 are provided at the lower part of the main body portion 11, but the positions where the coolant supply unit 23 and the coolant discharge unit 25 are provided. Is not particularly limited, and may be provided on the side of the main body 11, for example.
[0040]
Further, in the above embodiment, the bearing box 1 of the segment roll installed in the segment frame of the continuous casting machine has been described as an example, but the bearing box of the present invention is limited to the bearing box 1 of the segment roll. However, it can be widely applied to bearing boxes of rotating rolls that convey high-temperature objects.
Example
[0041]
In order to confirm the effect of the present invention, a test was conducted in which the bearing box of the slab support roll (guide roll) of the steel slab continuous casting machine was cooled by cooling water, which will be described below.
[0042]
The bearing box to be tested is a bearing box of a slab support roll that supports slabs having a surface temperature of 700 to 900 ° C. In this bearing box, a bearing (rolling bearing) having an outer diameter of 170 mm, an inner diameter of 110 mm, and a width of 43 mm is used. ) Is installed.
[0043]
In the test, the bearing box 1 according to the present invention shown in FIGS. 1 to 6 and the bearing box 37 shown in FIG. 8 were installed for comparison, and the temperatures of the bearing boxes 1 and 37 during continuous casting were measured. Both were compared.
[0044]
The bearing box 1 according to the present invention shown in FIGS. 1 to 6 (hereinafter, also referred to as “example of the present invention”) and the bearing box 37 for comparison shown in FIG. 8 (hereinafter, also referred to as “conventional example”). On the other hand, 15 L of cooling water per minute was introduced per bearing box to cool the bearing box 1 and the bearing box 37. The cooling water after cooling the bearing box 1 and the bearing box 37 flows down the outer periphery of the bearing boxes 1 and 37 as they are in both the bearing box 1 according to the present invention and the bearing box 37 as a conventional example.
[0045]
In a continuous casting operation for a certain day, the temperature of the end positions of the bearing portions 3, 39 adjacent to the seal portions 5, 41 indicated by the reference numerals “P” in FIGS. 5 and 8 was measured by a sheath thermocouple. As a result, in the example of the present invention, the temperature of the seal portion 5 during continuous casting is 20 to 40 ° C. lower than the temperature of the seal portion 41 of the conventional example, and the influence of the radiant heat from the slab on the seal portion 5 It was confirmed that it can be reduced.
[0046]
In the conventional example, the seal portion 41 is not covered with the lid member 47, whereas in the example of the present invention, the seal portion 5 is also covered with the second jacket component 19. Therefore, as a result of determining the temperature of this portion by temperature analysis, it was confirmed that the temperature of the seal portion 5 is also lower in the example of the present invention as compared with the conventional example.
Code description
[0047]
1 Bearing box
3 Bearing part
5 Seal part
7 1st coolant passage
9 Second coolant passage
11 Main body
13 Bottom of the first coolant passage
15 Bottom of the second coolant passage
17 1st jacket parts
19 Second jacket parts
21 Fixed parts
21a protruding part
23 Coolant supply unit
25 Coolant discharge part
27 passage (coolant supply unit)
29 passage (coolant discharge part)

31 segment frame
33 segment roll
35 rolls
37 Bearing box
39 Bearing part
41 Seal part
43 retainer
45 Cooling water channel
47 Closure member
49 slabs
The scope of the claims
[Claim 1]
A rotary roll bearing box that carries a high-temperature object and has a bearing portion and a seal portion provided adjacent to the bearing portion.
The first coolant passage formed on the outer peripheral side of the bearing portion and through which the cooling liquid flows, and the first coolant passage formed on the outer peripheral side of the seal portion radially inside the first coolant passage. A rotating roll bearing box for transporting a high temperature object, characterized by having a second coolant passage that communicates with the passage and allows the cooling liquid to flow.
[Claim 2]
The total width of the first coolant passage and the second coolant passage in the axial cross section of the rotary roll of the bearing box is ½ or more of the width of the bearing box. A bearing box for a rotating roll that conveys a high-temperature object according to claim 1.
[Claim 3]
The high temperature object according to claim 1 or 2, further comprising a first jacket component forming the first coolant passage and an annular second jacket component forming the second coolant passage. Rotating roll bearing box to carry.
[Claim 4]
A plurality of fixing parts for fixing the first jacket component and the second jacket component are provided at the boundary between the first coolant passage and the second coolant passage at predetermined intervals. A rotary roll bearing box for transporting a high-temperature object according to claim 3.
[Claim 5]
The fixing component is fixed to the bottom surface of the first coolant passage, has a protruding portion protruding toward the second coolant passage side, and the first jacket component is fixed to the top surface of the fixing component. The rotary roll bearing box for transporting a high-temperature object according to claim 4, wherein the second jacket component is fixed to a protruding portion of the fixed component.