JPH0119961B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a saddle device for a Sendzima mill, and more particularly to a saddle device that makes it possible to adjust the roll position of its back-up roll.

In the Sendzima mill, the back-up roll is supported by axes A, B, C, and D as shown in Figure 1.
Of R _A , R _B , R _C , and R _D , the back up rolls R _B and R _C supported by the B and C axes are moved almost vertically by the adjustment gear 1 and the rack 2 that meshes with it. It is configured so that its position can be adjusted. In the figure, numerals 3 and 4 are screw gears for locking the shafts B and C, and racks for operating the screw gears.

The position adjustment mechanism of Backup Prowl R _B and R _C is as follows.
An eccentric ring 7 whose inner diameter center O ₁ and outer diameter center O ₂ are at different positions is fitted to the shaft 5 via a key 6, and an eccentric ring 7 is fitted to the shaft 5 via a needle roller bearing 8 of a full roller type.
An intermediate ring 9 with an inner diameter center O ₂ and an outer diameter center O ₃ fitted in different positions, a saddle ring 11 fitted to the intermediate ring 9 via a full roller type needle roller bearing 10, and It consists of the adjustment gear 1 which is fixed to both end faces in the axial direction through rivets 12, etc., and a rack 2 which meshes with the gear 1. Saddle ring 11 is saddle 1
3, the eccentric ring 7 has shaft 5 and the shaft 5 at the shoulder portions of both ends in order to make its axial both end surfaces contact the end surfaces of the rollers 15 of the bearing 14 of the shaft 5 and serve as guide surfaces 16 that guide the rolling motion thereof. It is provided with a stepped portion 17 forming a concentric cylindrical surface.

To adjust the position of backup rolls R _B and R _C ,
This is done by moving the rack 2 up and down and rotating the adjustment gear 1. When the intermediate ring 9 rotates together with the adjustment gear 1, the inner diameter center O 3 of the saddle ring 11 (the outer diameter center O ₃ of the intermediate ring 9 ) with respect to the center of axis 5
O ₁ (coinciding with the center of the inner diameter of the eccentric ring 7) is moved approximately two-dimensionally in the vertical direction. That is, the axis 5 corresponds to the axes B and C, and the position of the backup roll is adjusted.

Sendzima Mill's back-up rolls, especially their B and C axes, have conventionally used the saddle device described above, and the rolling bearings interposed between the rings 7, 9, and 11 have been used to increase their load capacity. Generally, full-roller type needle roller bearings 8, 10 are used, and because they are full-roller types, the amount of grease sealed in the bearings 8, 10 is smaller than that of general bearings. Also each ring 7,
The inner and outer diameters of gear 9 are eccentric, and the adjustment gear 1 is
Because the PCD is eccentric, the needle roller bearing 8,
9 is considered to be the so-called open type, which does not have a sealing device.

However, since rolling mills such as the Sendzima Mill often use large amounts of coolant during operation, water and foreign matter can easily enter the bearings, causing rust and dents. This will significantly shorten the service life and cause environmental pollution due to spilled grease. Furthermore, grease leakage
Dry rolling operations that do not use coolant have the disadvantage that they cannot be operated for long periods of time.

The purpose of this invention is to prevent coolant from entering the bearing section and grease from flowing out in the saddle device of the Sendzima mill as described above, thereby significantly extending the life of the saddle and enabling long-term dry rolling. A cylindrical surface concentric with the PCD of the rolling element arrangement of the rolling bearing interposed between the intermediate ring and the eccentric ring is provided on the inner diameter of the aforementioned adjustment gear and the outer diameter shoulder of the eccentric ring, respectively. The saddle device is characterized in that a sealing member such as an oil seal is interposed between the opposing cylindrical surfaces to form a sealed bearing portion.

This invention will be described in detail below with reference to the embodiments shown in FIGS. 4, 5, and 6. In addition, Figures 4 to 6
In the figure, the same parts as in FIGS. 2 and 3 are given the same reference numerals.

The inner diameter of the adjustment gear 1 is formed to be a cylindrical surface 21 concentric with the PCD 20 of the roller arrangement of the needle roller bearing 8, and a cylindrical surface larger than the cylindrical surface of the stepped portion 17 is formed at both axial end shoulders of the eccentric ring 7. Diameter, PC with roller arrangement
A stepped portion 23 having a cylindrical surface 22 concentric with D20 and having an appropriate facing interval H is provided on the inner diameter cylindrical surface 21 of the adjustment gear 1, and a sealing member such as an oil seal 24 is fitted and fixed to the stepped portion 23. , the seal lip 25 is brought into sliding contact with the inner diameter cylindrical surface 21 of the adjusting gear 1 with an appropriate contact pressure.

On both axial end surfaces of the intermediate ring 9 and on both axial end surfaces of the saddle ring 11, a plurality of radial water drains are provided at least in the lower part thereof to form a gap with the opposing end surface of the adjustment gear 1, as shown in the figure. It is desirable to provide grooves 26 and 27, and these drainage grooves may be provided on the end face of the adjustment gear 1. Note that the intermediate ring 9 is rotated together with the adjustment gear 1, but since the rotation angle is a small angle as seen from the number of teeth of the adjustment gear 1, the rotation angle of the intermediate ring 9 is
Alternatively, if a water drainage groove is provided in the adjustment gear 1, it may be provided in a position where water that has entered the bearing part due to its rotation can be easily drained out. They may be provided evenly distributed around the circumference.

Moreover, instead of providing a drain groove, an O-ring 28 held by either of the saddle ring 11 and the adjusting gear 1 may be interposed between the opposing end surfaces of the saddle ring 11 and the adjusting gear 1, as shown in FIG.

As described above, this invention makes it possible to make the saddle bearing part a sealed type by making slight improvements to the inner diameter of the adjusting gear and the shoulders at both axial ends of the eccentric ring. Even though the inner and outer diameters of the rings are eccentric and the axis can be adjusted to any position by rotation of the intermediate ring and adjustment gear, the oil seal etc. interposed between the eccentric ring and the adjustment gear is not sealed. The contact pressure of the sliding part (seal lip) of the member does not change, always maintains the best contact pressure, and prevents coolant or foreign matter from entering the bearing part while the Sendzima mill is operating. In addition, since the inconvenience of the sealing grease being washed away and flowing out by the coolant can be eliminated, it is possible to prevent the formation of rust and impressions on the bearing part, and also to enable dry rolling for a long time.
The life of the saddle device can be significantly improved. Further, by providing a drainage groove, a small amount of water that has entered the saddle can be discharged to the outside of the saddle while avoiding the bearing portion, thereby further improving the sealing effect. Furthermore, by interposing an O-ring or the like as shown in FIG. 7, a completely sealed saddle can be provided in combination with the sealing device. Note that although the depth of the roller guide surface 16 is reduced by providing the stepped portion 23, there is no risk that the bearing function will be adversely affected by this extent.

[Brief explanation of drawings]

Figure 1 is a diagram showing the roll arrangement of Sendzima Mill,
Figure 2 is a partially cutaway front view of the conventional device;
3 is a vertical side view of the same, FIG. 4 is a partially cutaway front view of the embodiment of the present invention, FIG. 5 is a vertical side view of the same, FIG. 6 is an enlarged vertical side view of the main part, and FIG. The figure is an enlarged vertical sectional side view of the main parts of another embodiment. DESCRIPTION OF SYMBOLS 1... Adjustment gear, 5... Shaft, 7... Eccentric ring, 8, 10... Needle roller bearing, 11... Saddle ring, 16... Guide surface, 17... Step part, 20...
... PCD with roller arrangement, 21 ... Inner diameter cylindrical surface, 22
...Cylindrical surface, 23...Step, 24...Oil seal, 25...Seal lip, 26, 27...Drain groove, 28...O ring.

Claims (1)

[Scope of Claims] 1. An eccentric ring that fits on a shaft, an intermediate ring that fits on the outer periphery of the shaft through a rolling bearing, and a saddle ring that fits on the outer periphery of the eccentric ring through a rolling bearing. In the saddle device of Sendzima Mill, the ring and the intermediate ring have their inner and outer diameter surfaces eccentrically arranged, and the intermediate ring is integrally equipped with an adjusting gear for adjusting the position of the shaft by rotating the ring. , the inner diameter surface of the adjustment gear is formed into a cylindrical surface concentric with the rolling PCD of the rolling element of the rolling bearing between the eccentric ring and the intermediate ring, and the shoulder of the eccentric ring is formed to face the inner diameter surface of the adjustment gear. A saddle device of Sendzima Mill, characterized in that a seal step forming a concentric cylindrical surface is provided, and a sealing member is interposed between the inner diameter surface of an adjusting gear and the seal step cylindrical surface of an eccentric ring. 2. The eccentric ring has both end faces in the axial direction serving as guide surfaces for guiding the roller end faces of the back-up roll bearing, and a stepped portion forming the outer diameter of the guide surface concentrically with the inner diameter surface of the eccentric ring is the seal. 2. A saddle device for a Sendzima mill according to claim 1, wherein the guide surface is formed on the outside of the step, and the outer diameter of the guide surface is smaller than the diameter of the cylindrical surface of the step. 3 Either the intermediate ring or the adjustment gear is
Claim 1, wherein at least the saddle ring and the adjustment gear have radial drainage grooves on opposite end faces of the lower part thereof, and either the saddle ring or the adjustment gear has radial drainage grooves on the opposite end faces of the lower part. or 2
Sendzima Mil's saddle device as described. 4. The saddle device for a Sendzima mill according to claim 1 or 2, wherein either the saddle ring or the adjustment gear includes a sealing member such as an O-ring that seals between the saddle ring and the adjusting gear.