JPH0133215Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a bearing device in a rolling mill, and enables easy oil management and maintenance of the bearing that supports the roll shaft, as well as the use of a bearing with a large load capacity. Moreover,
The purpose is to prevent strong adverse effects such as twisting on the product.

Cantilever rolling mills are mainly used as block mills for finish rolling of steel bars and wire rods, and in this rolling mill, a pair of parallel bearing housings are rotatably provided in the casing.
Each bearing housing is provided with a rotatable roll shaft that is inserted through the inside of the housing and is eccentric to the outer peripheral surface of the bearing housing, and a rolling roll is provided at the tip of each roll shaft that projects from the bearing housing. There is one in which the gap between both rolling rolls is adjusted by rotating the rolls.

By the way, in the above-mentioned conventional rolling mill, the roll shaft is rotatably supported in the bearing housing via a rolling bearing at the base side and a sliding bearing at the tip side, and the diameter of each bearing is the same as the diameter of the rolling roll. is determined by the wall thickness of the bearing housing, but when using a sliding bearing like this,
Since oil management and maintenance are more difficult than with rolling bearings, improvements in this regard have long been desired.

In order to solve the above problem, it is conceivable to support the roll shaft by a bearing housing via a rolling bearing instead of a sliding bearing, for example. However, in this case, since the thickness of the rolling bearing in the radial direction is larger than that of the sliding bearing, the diameter of the portion of the roll shaft supported by the rolling bearing must be reduced, and as a result, As the deflection of the roll shaft increases, the negative effects such as torsion on the product will become stronger, and since rolling bearings generally have a small load capacity when they have the same outer diameter as sliding bearings, large loads will be applied to the roll shaft. A new problem arises in that rolling operations cannot be performed under load.

The present invention has solved the above problem, and its characteristics are that the casing is provided with a pair of parallel bearing housings that are rotatable, and that each bearing housing is inserted through the inside of the housing. A rotatable roll shaft eccentric to the outer peripheral surface of the bearing housing is provided, a rolling roll is provided on the part of each roll shaft that protrudes from the casing, and the gap between the rolling rolls is adjusted by rotating both bearing housings. In a rolling mill, each outer ring of a pair of rolling bearings that rotatably supports the rolling roll side support part of each roll shaft is rotatably supported directly by the bearing support member that constitutes the rolling roll side wall part of the casing. The opposite end of the rolling roll is fixed to the rolling roll end of each bearing housing, and the outer peripheral surface and inner peripheral surface of the outer ring of each rolling bearing are fixed in accordance with the eccentric relationship between the outer peripheral surface of the bearing housing and the roll axis. It lies in the fact that it is eccentric.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

1 is a roll unit type casing, in which a housing support member 2 forming the side wall of the casing 1 opposite to the rolling roll, an intermediate member 3, and a bearing supporting member 4 forming the side wall of the rolling roll of the casing 1 are arranged from right to left. It is constructed by arranging them in series in the above order.

Reference numeral 5 denotes a pair of upper and lower bearing housings, which are disposed vertically inside the casing 1 and are connected to the housing support member 2.
The base, which is the right end, is rotatably supported, and a mounting flange 6, which is located on the right side of the bearing support member 4, is formed on the outer periphery of the tip, which is the left end. The outer peripheral surface and inner peripheral surface of each bearing housing 5 are eccentric.

Reference numeral 7 denotes a pair of upper and lower roll shafts, which are inserted through the inside of each corresponding bearing housing 5 and protrude from the casing 1 to the left and right. A drive shaft 9 for transmitting power is interlocked and connected, and a rolling roll 11 is fixed via a cylinder 10 to the tip of the roll shaft 7 that projects leftward from the casing 1 . Each roll shaft 7 is concentric with the inner circumferential surface of each bearing housing 5 and eccentric with respect to the outer circumferential surface of each bearing housing 5.

Reference numeral 12 denotes a pair of upper and lower base side rolling bearings that rotatably support the base side of each roll shaft 7, and are interposed between the bases of each roll shaft 7 and each bearing housing 5. In the illustrated example, a self-aligning double-row roller bearing is used as the base side rolling bearing 12.

Reference numeral 13 denotes a pair of upper and lower tip side rolling bearings that rotatably support the tip side of each roll shaft 7, and are disposed in the bearing support member 4 via the fitting hole 14 so as to be rotatable up and down. On each roll shaft 7, it is arranged between the bearing housing 5 and the cylindrical body 10 in a continuous manner. In the illustrated example, a double-row roller bearing is used as the tip side rolling bearing 13, and includes an inner ring 15, an outer ring 16, rolling elements 17 shown as rollers, and the like. A mounting flange 18 is formed on the outer periphery of the right end of the bearing support member 4 of the outer ring 16 that projects to the right, and the mounting flange 18 is detachably connected to the mounting flange 6 of the bearing housing 5 by bolts 19. The outer ring 16 is rotatably provided on the bearing support member 4, and the outer circumferential surface and inner circumferential surface of the outer ring 16 are made eccentric in correspondence with the eccentric relationship between the outer circumferential surface of the bearing housing 5 and the roll shaft 7. be. 20 is a sealing material, and the tip side rolling bearing 1
3 and the cylindrical body 10.

Reference numeral 21 denotes an operating shaft installed vertically at the rear of both bearing housings 5, and is rotatably provided in the intermediate member 3.
A pair of upper and lower worm-type drive gears 22 are fixedly installed in the middle part in the height direction, and each gear 22 is engaged with a worm-type driven gear 23 formed on the outer periphery of each bearing housing 5. Therefore, by rotating the operating shaft 21, the drive gear 2
2 and the driven gear 23, the outer ring 1 of each bearing housing 5 and each tip side rolling bearing 13
6 is rotationally driven. As a result, the outer peripheral surface of the bearing housing 5 and the roll shaft 7 are made eccentric, and the outer ring 1
Since the outer circumferential surface and the inner circumferential surface of the roller 6 are eccentric, both the rolling rolls 11 move up and down, and the gap between the rolling rolls 11 is adjusted.

According to the embodiment configured as described above, the base side of the roll shaft 7 is connected to the base side by the base side rolling bearing 12.
Since the tip side is rotatably supported by the tip side rolling bearing 13, rolling bearings are used as the bearings 12 and 13 that support the roll shaft 7 instead of using a sliding bearing. , oil management and maintenance of the bearings 12 and 13 can be easily performed. Moreover, since the outer ring 16 of the tip side rolling bearing 13 is directly supported on the bearing support member 4 without using the bearing housing 5, when the bearing is supported as the tip side rolling bearing 13 via the bearing housing. Compared to the above, it is possible to use bearings with larger inner and outer diameters corresponding to the wall thickness of the bearing housing and a larger load capacity, and it is also possible to carry out rolling operations where a large load is applied to the roll shaft 7, and as mentioned above,
Since a large inner diameter can be used as the tip-side rolling bearing 13, the diameter of the supporting portion of the tip-side rolling bearing 13 on the roll shaft 7 can be increased, and therefore, the roll shaft 7 can be deflected to a large extent during rolling operations. It is possible to prevent the occurrence of strong negative effects such as twisting on the product.

As described in detail above, according to the present invention, since the rolling roller side of each roll shaft is supported by a rolling bearing, oil management and maintenance of the bearing can be easily performed. Furthermore, each outer ring of the rolling bearing is rotatably directly supported by a bearing support member that constitutes the rolling roll side wall of the casing, and the end of each outer ring on the side opposite to the rolling roll is fixed to the rolling roll side end of each bearing housing. The outer circumferential surface and inner circumferential surface of the outer ring of each rolling bearing are made eccentric to correspond to the eccentric relationship between the outer circumferential surface of the bearing housing and the roll shaft, so that the bearing housing can freely rotate against the roll side wall of the casing. Compared to the case where a rolling bearing is installed inside the rolling bearing, it is possible to use a rolling bearing with a larger inner and outer diameter and a larger load capacity. As a rolling bearing with a large inner diameter can be used, the diameter of the supporting part of the rolling bearing on the roll shaft can be increased, which prevents large deflection of the roll shaft during rolling operations and prevents twisting of the product. It is possible to prevent strong negative effects such as The present invention has the above various advantages,
It is very profitable.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a partially sectional front view, Fig. 2 is a side view, Fig. 3 is an enlarged view of the main part of Fig. 1, and Fig. 4 is A of Fig. 3. - It is a sectional view taken along the line A. 1...Casing, 5...Bearing housing, 7
... Roll axis, 11 ... Roll roll, 12, 13
... Base side/tip side rolling bearing, 15 ... Inner ring, 16 ... Outer ring, 17 ... Rolling element, 21 ... Operating shaft, 22 ... Drive gear, 23 ... Driven gear.

Claims (1)

[Claims for Utility Model Registration] The casing 1 is rotatably provided with a pair of bearing housings 5, 5 disposed in parallel, and is inserted into the inside of each bearing housing 5, 5 and is attached to the outer peripheral surface of the bearing housing. Roll shafts 7, 7 eccentric to the
are rotatably provided, rolling rolls 11, 11 are provided on the portions of the roll shafts 7, 7 protruding from the casing 1, and by rotating both bearing housings 5, 5, the gap between the rolling rolls 11, 11 is reduced. In the rolling mill to be adjusted, each of the outer rings 16, 16 of a pair of rolling bearings 13, 13, which rotatably support the rolling roll side support portion of each roll shaft 7, 7, is connected to a bearing support that constitutes the rolling roll side wall portion of the casing 1. The outer rings 16, 16 are directly supported rotatably by the member 4, and the ends of the outer rings 16, 16 on the side opposite to the rolls are fixed to the ends of the bearing housings 5, 5 on the side of the rolls, so that the outer peripheral surface of the bearing housings 5 and the roll shaft 7 Each rolling bearing 1 corresponds to the eccentric relationship with
A bearing device for a rolling mill, characterized in that the outer and inner circumferential surfaces of outer rings 16 and 16 of No. 3 and 13 are eccentrically arranged.