JP3294309B2 - Roll bearing device for hot processing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll bearing device for hot treatment equipment, and more particularly to a bearing device such as a pinch roll, a guide roll or a roll for continuous casting equipment or hot rolling equipment. It is an object of the present invention to secure a preferable bearing function in which dust and moisture resistance and leakage of a lubricant in the bearing portion are appropriately prevented.

[0002]

2. Description of the Related Art In continuous casting equipment, it is necessary to use a large number of pinch rolls and guide rolls, and also in a hot rolling mill, it is necessary to provide guide rolls as well as rolling rolls. These rolls are carried in bearing housings. That is, the bearing is interposed between the roll shaft portion and a bearing or the like, and the same is performed in a heat treatment facility for annealing, normalizing, and other steel slabs or steel strips.

[0003] Further, such a bearing is provided between a rotating shaft portion and a fixed bearing box to prevent intrusion of scale and other dust and cooling water generated from slabs and the like during operation. Although a sealing material is used, even in this case, lubricant such as grease or the like is generally injected into the bearing part by press-fitting because the leakage of lubricant from the bearing part and ingress of dust and moisture into the bearing part cannot be avoided. At the same time, the exhaust circulation is performed to facilitate the bearing operation.

[0004]

In the above-mentioned conventional general bearings, even if a smooth bearing action can be obtained, the formation of the lubricant supply and circulation system must be complicated in terms of equipment. In other words, in the case of the continuous casting equipment, the slab extracted from the bottom of the water-cooled mold is held on both sides of a huge equipment for cooling and solidifying while holding the slab at a constant thickness. Since the above-described lubricant supply circulation mechanism is formed for the entire roll bearing portion to be provided, the continuous casting equipment as a whole becomes a lubricant supply mechanism, which significantly complicates the equipment, and the supply in operation. ,
The operating costs for discharge must also increase. In recent years, annealing and other heat treatment equipment will also run at a considerably high speed, and all of the rolls installed in the overall manufacturing process of steel billets, steel strips, etc., which must be long and large equipment In this case, a similar lubricant supply and circulation mechanism is required, so that it is unavoidable to increase the complexity and cost.

Therefore, recently, it has been considered that the lubrication of the bearing operation is simply performed by using grease or the like sealed in the bearing portion without employing the above-described lubricant supply and circulation system. To maintain a sealing property that secures pressure resistance against a pressure rise due to high heat during operation between a shaft portion serving as a rotating member and a bearing chock member serving as a fixed member under the rotating condition of the movable member. Is not easy.

Further, the inventors of the present invention have conducted a practical study on sealing and lubricating a bearing portion for a continuous casting facility without using such a lubricant supply and circulation system. The bearing that received the roll shaft directly in contact with the slab due to such high heat not only raised the temperature to around 200 ° C and increased the pressure, but also the sealed bearing during operation. will be moving in the chocks in the expansion stretching roll itself due to the high temperature in the axial direction, also reaches ^{-0.2kg / cm 2 ~ + 1.2kg /} cm 2 within chocks in chocks within the movement of the sealing bearing part The negative pressure portion and the positive pressure portion change the internal pressure due to the temperature change itself (in the bearing portion, as shown in FIG.
(Approximately 0.4 kg / cm ² ). That is, such pressure fluctuations in the chocks reach 1.0 kg / cm ² or more as shown in FIG. 5. With such pressure fluctuations, when the pressure is low, outside air is sucked, so that dust and the like are sucked, and the pressure is increased. As a result, the grease or the like is pressed out, and a proper lubricating seal relationship cannot be secured.

[0007]

The present invention has been studied to solve the above-mentioned technical problems in the prior art, and as a result, it has been found that the pressure fluctuation in the chock as described above can be effectively eliminated and the present invention can be appropriately performed. It has succeeded in securing a stable bearing action, and is as follows.

(1) A dust seal material and an oil seal material are respectively disposed between a bearing chock and a corner ring disposed at a corner of a roll shaft, and gaps are formed at both ends of the bearing itself to form a seal. A roll bearing for a hot treatment facility, characterized in that a bearing seal material is provided opposite to the bearing, and pressure adjusting means for maintaining the positive and negative gaps at both ends of the bearing or at the periphery thereof at all times is provided. apparatus.

[0009]

[Function] A dust seal material and an oil seal material are disposed between a bearing chock and a corner ring disposed at a roll shaft corner, respectively, and gaps are formed at both ends of the bearing itself to seal. In addition, the inside of the chock and the outside atmosphere are effectively divided and sealed with respect to dust and oil, and in particular, both an oil seal free from obstruction due to attached dust and a dust seal free from obstruction due to attachment of oil are achieved.

Also, the bearing is provided with a bearing sealing material and a pressure adjusting means is provided for maintaining the positive and negative gaps at both ends of the bearing or at the periphery thereof. When operating in contact with a continuous cast slab or hot-rolling slab that reaches a temperature of up to 200 ° C in a short time due to the heat transfer, the grease in that part is included. 1.5 at ambient pressure of about 120 seconds
Even if the pressure is increased to around the atmospheric pressure, the pressure inside the chock is moderately moderated, and abnormal lowering of pressure due to cooling after operation is restricted, so that oil can leach out of the chock and dust can be sucked into the chock. To prevent.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the present invention as described above will be described with reference to the accompanying drawings. As shown in FIG. 1, a shaft portion 1 of a roll 10 is accommodated in a chock 3 which is a bearing box. , Chock 3 through bearing 2
The oil seal 4 and the oil seal 4 are provided between the end members 31 and 32 of the chock 3 and a corner ring 33 provided between the shaft 1 or the shaft 1 and the shoulder of the roll 10. Dust seals 5 are provided respectively. The oil seal 4 is an elastic body interposed between the corner ring 33 and the chock end member 32 as shown in the figure, while the dust seal 5 is formed by appropriately using a hard material as shown in the figure to perform accurate dust sealing. Close.

The bearing 2 is set by being locked to the shaft portion 1 by a locking ring 14, that is, at least a majority of the end face of the bearing 2 is opened by the corner ring 33 and the locking ring 14. Is held. In other words, the present invention provides the end members 31 and 32 of the chock 3 with respect to the gap 6 or 6a formed such that at least a majority region is open to the end of the bearing 2.
The one end member 31 is provided with the pressure adjusting means 7 outside.

FIG. 2 shows another embodiment of the present invention, in contrast to FIG. 1 as described above, that is, in this FIG. The end face of the end element 31 is therefore smooth and, in particular, the one projecting from the outer surface of the chocks is
a There is nothing in the setting section.

FIG. 3 shows another embodiment of the present invention, in which a pressure adjusting means 7b is embedded in a receiving portion 31a formed on the outer peripheral side of the end member 31, and the end member 3
The pressure condition of the cavity 6 in the through hole 31b formed on the inner surface side of the pressure regulator 1 is applied to the pressure adjusting means 7b.

The pressure adjusting means 7 or 7a as described above
Alternatively, as the 7b, a diaphragm method (appropriate use of gaseous gas), an air tube method, an elastic body (rubber or sponge, etc.) method, a cylinder method, or the like can be appropriately adopted, and although the member itself has an adjusting action, An external or external air or other gaseous gas may be used for the adjusting function.

The bearing 2 has a trochanter interposed between an inner ring and an outer ring. As an example, as shown in FIG. 1, a bearing seal material 24 is attached to each end of the inner ring 21 and the outer ring 22. It is preferable that the trochanter 23 is sealed in a lubricant such as grease. Further, in the bearing 2 part sealed in this way, the gaps 6 and 6a formed at both ends of the bearing 2 are formed in or outside the chock 3 as shown in FIG. It is preferable that the both ends of the bearing 2 be brought into constant pressure condition by making them communicate with each other by the communication pipe 8a as shown in FIG.

That is, as shown in FIG. 1, when the lubricant is sealed by using the bearing seal material 24, the roll 10 comes into contact with the high-temperature slab or slab and becomes high in temperature.
Or it will expand and contract in the axial direction with subsequent cooling,
The bearing 2 moves in the chock 3 together with the shaft 1 to increase or decrease the volume of the gaps 6 and 6a formed at both ends of the bearing 2, and to change the internal pressure as shown in FIG. In such a case, the atmosphere in one gap 6 or 6a freely flows into the other gap 6a or 6 via the communication hole 8 or the communication pipe 8a, and the pressure condition in each gap 6 or 6a. Can be made substantially constant.

Further, according to the present invention, a fluid pressure is always applied as shown in FIG. 2 by a flow path 9 having a pressure regulating valve or the like in the chock 3 so that the gaps 6 and 6a are always positive. The chock 3 is also maintained by the expansion and contraction of the roll 10 or the roll shaft 1 while maintaining the pressure condition.
So that the inside does not become negative pressure. By maintaining the inside of the chock 3 under the positive pressure condition in this way, it is possible to prevent the outside air (the accompanying dust and moisture) from entering the chock 3 and to clean the inside to ensure smooth lubrication performance. In addition, since the positive pressure in the chock 3 always acts on the sealed bearing 2, the lubricant in the bearing 2 does not flow out of the seal material 24 into the chock 3.

The use of the flow path 9 as described above seems to revive the flow path configuration for circulating the oil and the like in the bearing portion, which is unnecessary, but at least the return flow path is unnecessary. In addition, the need for a supply source such as grease is eliminated, and appropriate equipment compactness is achieved. The communication hole 8 and the communication pipe 8a are also short and partial, so that the simplification of the configuration and the reduction in size according to the present invention can be appropriately obtained.

The communication pipe 8 as shown in FIG.
a is provided outside of the chock 3.
Shows that the present invention can be adopted with little processing. That is, in the existing bearing chock, a lubricant supply system and a discharge system as described above are provided so that the lubricant is circulated in the bearing portion. It is only necessary to directly connect the agent supply port and the discharge port with the short communication pipe 8a.

Although FIGS. 1 to 3 show the constitutional relation as an example in order to avoid duplication of the drawing, the combinational relation between the pressure adjusting means 7, 7a and 7b and the communication pipe 8a is appropriately changed. Naturally, it can be adopted and implemented.

The maintenance of the positive pressure of the chock 3 as shown in FIG. 2 can prevent the invasion of the outside air and the intrusion of dust and moisture associated therewith even with a slight pressure such as 0.1 kg / cm ² . As shown in FIG. 5, a pressure change of more than 1.0 kg / cm ² causes the relation of about 0.1 kg / cm ² to be too small.
In the present invention, since the pressure adjusting means 7, 7a, 7b is employed and the communication hole 8 or the communication pipe 8a is used in combination, an appropriate effect can be obtained even with this degree. However, 0.
There is no particular disadvantage if pressure conditions of 5 kg / cm ² or slightly higher are employed.

[0023]

According to the present invention as described above, in a hot treatment facility such as a continuous casting facility or a hot rolling facility, a gap portion is provided in a chock, and a bearing seal is formed on a bearing itself comprising inner and outer rings. With a structure in which the seal member is doubled by opposing the material and the gap in the chock, the dust-proof and moisture-proof or leakage of the lubricant is appropriately prevented, and the effective bearing function is simplified and reduced in cost. This is an invention which is industrially effective.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a bearing portion showing one embodiment of the present invention.

FIG. 2 is a partial sectional view similar to FIG. 1 for another embodiment thereof.

FIG. 3 is a partial cross-sectional view of yet another embodiment of the present invention.

FIG. 4 is a table showing an example in which a pressure fluctuation state in a bearing of a pinch roll in a conventional continuous casting facility is measured for a continuous casting cycle.

FIG. 5 is a chart showing a pressure change state during a continuous casting cycle in a bearing box of a pinch roll of a conventional continuous casting facility.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft part 2 Bearing 3 Chock 4 Oil seal 5 Dust seal 6 Gap part 6a Gap part 7 Pressure adjustment means 7a Pressure adjustment means 7b Pressure adjustment means 8 Communication hole 8a Communication pipe 9 Flow path 10 Roll 14 Lock ring 21 Inner ring 22 Outer ring 23 Trochanter 24 bearing seal material 31 end member 31a receiving portion 31b through hole 32 end member 33 cornering

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-32558 (JP, A) Japanese Utility Model Showa 56-80954 (JP, U) Japanese Utility Model Application Showa 63-6223 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) F16C 13/02 B21B 31/07 B22D 11/128 340 F16C 33/66 F16C 33/76

Claims (1)

(57) [Claims] 1. A dust seal material and an oil seal material are respectively disposed between a bearing chock and a corner ring disposed at a corner portion of a roll shaft, and gaps are formed at both ends of the bearing itself to perform sealing. A roll bearing device for hot treatment equipment, characterized in that a bearing sealing material is provided opposite to the bearing, and pressure adjusting means for maintaining the positive and negative gaps at both ends of the bearing or in the surroundings at all times is provided. .