CN103056166A - Adaptive roller group - Google Patents

Abstract

The invention discloses a self-adaptive roll group, comprising a roll shaft, oil film bearing assemblies for radially supporting the roll shaft are respectively provided at both ends of the roll shaft, and an oil film bearing assembly for axially positioning the roll shaft is provided on the end journal of the roll shaft. The rolling bearing assembly of the roll shaft, the oil film bearing assembly includes a bearing seat I, an inner bushing arranged in the bearing seat I and an oil film bearing fixedly installed on the inner peripheral wall of the inner bushing, the outer peripheral wall of the inner bushing is in contact with the A spherical fitting structure is provided between the inner peripheral walls of the bearing housing 1, and the oil film bearing is sleeved on the roll shaft. The self-adaptive roll group of the present invention can automatically adapt to the deflection and deformation of the roll shaft when the roll bearing is subjected to rolling load, so as to ensure the uniformity of the thickness of the lubricating oil film between the roll shaft and the oil film bearing, and ensure that the oil film bearing is always in the fluid lubrication condition .

Description

Adaptive Roll Set

technical field

The invention belongs to the technical field of metal rolling, and in particular relates to a self-adaptive deflection and deformation roll group.

Background technique

The roll box of the cantilever rolling mill has a small space structure, resulting in a small center distance between the roll shafts. Reduce the space size of the roller box and adapt to the working conditions of high-speed rotation of the roller shaft.

Since the roll bearing will deflect and deform after being loaded, the oil film gap formed between the roll shaft and the oil film bearing will change with the deflection. If the deflection of the roll shaft exceeds the thickness of the oil film, the state of fluid friction will be destroyed, and the surface of the roll shaft will be in direct contact with the surface of the oil film bearing, resulting in dry friction, which will generate a large amount of friction work loss And severe wear and tear will cause severe temperature rise in sliding bearings, and even burn out oil film bearings. Therefore, dry friction is absolutely not allowed between the roll shaft and the oil film bearing.

In order to avoid the occurrence of dry friction, the common method is to process a section of the cylindrical surface of the roll shaft in contact with the oil film bearing into a conical surface with a slight taper. The size of the taper needs to be determined according to the deflection deformation of the roll shaft after being loaded. , and it is very important to determine a reasonable taper to ensure that a uniform thickness of lubricating oil film is formed between the friction pairs. However, since the rolling mill is working at different temperatures when rolling different steel grades and products of different specifications, the rolling force it bears is different, so the resulting deflection deformation is also different, that is, the actual production The amount of deflection of the middle roller varies, so it is very difficult to determine the taper.

Contents of the invention

In view of this, the object of the present invention is to provide a self-adaptive roll group, which can automatically adapt to the deflection of the roll shaft when the roll bearing is subjected to rolling load, so as to ensure the lubrication between the roll shaft and the oil film bearing The uniformity of the oil film thickness ensures that the oil film bearing is always in the fluid lubrication condition.

To achieve the above object, the present invention provides the following technical solutions:

An adaptive roll group, including a roll shaft, oil film bearing assemblies for radially supporting the roll shaft are respectively provided at both ends of the roll shaft, and rolling bearings for axially positioning the roll shaft are provided on the end journals of the roll shaft Assemblies, the oil film bearing assembly includes a bearing seat I, an inner shaft sleeve arranged in the bearing seat I and an oil film bearing fixedly installed on the inner peripheral wall of the inner shaft sleeve, the outer peripheral wall of the inner shaft sleeve and the bearing seat I A spherical fitting structure is provided between the inner peripheral walls, and the oil film bearing is sleeved on the roll shaft.

Further, the oil film bearing assembly further includes an outer shaft sleeve fixedly installed on the inner peripheral wall of the bearing seat 1, and the spherical fitting structure is arranged between the inner shaft sleeve and the outer shaft sleeve.

Further, the spherical surface matching structure includes a convex spherical surface arranged on the outer peripheral wall of the inner bushing and protruding outward, and a concave spherical surface arranged on the inner peripheral wall of the outer bushing and cooperating with the convex spherical surface.

Further, the outer shaft sleeve is divided into two sections, and the interface between the two sections of the outer shaft sleeve is perpendicular to its axis and coincides with the symmetrical plane of the concave spherical surface.

Further, snap rings for clamping both ends of the outer sleeve are provided on the inner peripheral wall of the bearing seat I.

Further, the rolling bearing assembly includes a bearing housing II, a rolling bearing installed in the bearing housing II and sleeved on the end journal of the roll shaft, fixedly installed on the bearing housing II and used for connecting with the outer bearing of the rolling bearing. An outer bearing cap fitted on the end face of the ring and an inner bearing cap fixedly mounted on the end face of the roll shaft and used to cooperate with the end face of the inner ring of the rolling bearing.

Further, there is a gap for the radial movement of the rolling bearing between the bearing seat II and the rolling bearing.

Further, gaskets are respectively provided between the outer ring of the rolling bearing, the bearing seat II and the outer bearing cover.

The beneficial effects of the present invention are:

In the self-adaptive roll set of the present invention, a spherical fitting structure is arranged between the bearing seat I and the inner shaft sleeve of the oil film bearing assembly, so that the inner shaft sleeve can rotate relative to the bearing seat I, and when the roll shaft is subjected to rolling load, the deflection occurs. During bending deformation, the inner bushing will rotate with the bending deformation of the roll shaft through the spherical fit structure, so that a uniform lubricating oil film can always be formed between the oil film bearing and the roll shaft, ensuring that the oil film bearing is always in the fluid lubrication condition.

Description of drawings

In order to make the purpose, technical scheme and beneficial effect of the present invention clearer, the present invention provides the following drawings for illustration:

Fig. 1 is the structural representation of the embodiment of self-adaptive roller set of the present invention;

Fig. 2 is the first structural schematic diagram of the oil film bearing;

Fig. 3 is a second structural schematic diagram of the oil film bearing;

Fig. 4 is a schematic diagram of the force of the roll shaft during rolling;

FIG. 5 is a detailed view of A in FIG. 4 .

Detailed ways

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1 , it is a schematic structural diagram of an embodiment of an adaptive roll set according to the present invention. The self-adaptive roll set of this embodiment includes a roll shaft 1, the two ends of the roll shaft 1 are respectively provided with an oil film bearing assembly 2 for radially supporting the roll shaft 1, and the end journal of the roll shaft 1 is provided with an axial The rolling bearing assembly 3 for positioning the roll shaft 1, the oil film bearing assembly 2 includes the bearing seat I 4, the inner shaft sleeve 5 arranged in the bearing housing I 4 and the oil film bearing 6 fixedly installed on the inner peripheral wall of the inner shaft sleeve 5, the inner shaft A spherical fit structure is provided between the outer peripheral wall of the cover 5 and the inner peripheral wall of the bearing seat 14, and the oil film bearing 6 is set on the roll shaft 1.

In the self-adaptive roll set of the present embodiment, a spherical fitting structure is set between the bearing seat 14 of the oil film bearing assembly 2 and the inner shaft sleeve 5, so that the inner shaft sleeve 5 can rotate relatively with respect to the bearing housing 14, as shown in Figure 4 As shown in Figure 5, when the roll shaft 1 is deflected and deformed by the rolling load, the inner bushing 5 will rotate with the deflection and deformation of the roll shaft 1 through the spherical fit structure, so that the oil film bearing 6 and the roll shaft 1 A uniform lubricating oil film can always be formed between them to ensure that the oil film bearing is always in the fluid lubrication condition.

Further, as shown in Figure 3, the oil film bearing assembly 2 also includes an outer shaft sleeve 7 fixedly installed on the inner peripheral wall of the bearing housing 14, and the spherical fitting structure is arranged between the inner shaft sleeve 5 and the outer shaft sleeve 7, and this structure is adopted The oil film bearing assembly 2 can prevent the bearing seat 14 from being worn, and reduce the rotational resistance of the inner shaft sleeve 5.

The spherical surface matching structure of this embodiment includes a convex spherical surface arranged on the outer peripheral wall of the inner shaft sleeve 5 and protruding outward, and a concave spherical surface arranged on the inner peripheral wall of the outer shaft sleeve 7 and matched with the convex spherical surface, and the center of the convex spherical surface falls inside. On the axis of the shaft sleeve 5, the center of the concave spherical surface falls on the axis of the outer shaft sleeve 7. The spherical fit structure of this structure not only enables the inner shaft sleeve 5 to rotate relative to the outer shaft sleeve 7, but also facilitates assembly. That is, the outer shaft sleeve 7 is divided into two sections, and the interface of the two sections of outer shaft sleeve 7 is perpendicular to its axis and coincides with the symmetrical plane of the concave spherical surface. When assembling, the two sections of outer shaft sleeve 7 are separated from the bearing seat The two ends of I 4 are loaded into the bearing seat I 4, and the concave spherical surface is matched with the convex spherical surface. Preferably, the inner peripheral wall of the bearing seat 14 is provided with snap rings 8 for clamping the two ends of the outer shaft sleeve 7, which can effectively fix the outer shaft sleeve 7 in the bearing seat 14.

Further, the rolling bearing assembly 3 of this embodiment includes a bearing seat II 9, a rolling bearing 10 installed in the bearing seat II 9 and sleeved on the end journal of the roll shaft 1, fixedly installed on the bearing seat II 9 and used for connecting with the rolling bearing The outer bearing cap 11 fitted with the outer ring of 10 and the inner bearing cap 12 fixedly installed on the end surface of the roll shaft 1 and used to cooperate with the inner ring of the rolling bearing 10, the rolling bearing assembly 3 adopting this structure can support and position the roll shaft 1 from the axial direction . Preferably, a gap a for the radial movement of the rolling bearing 10 is provided between the bearing seat II 9 of the present embodiment and the rolling bearing, and by setting the gap a between the bearing seat II 9 and the rolling bearing 10, the rolling bearing assembly 3 can be prevented from being damaged. The service life and reliability of the rolling bearing assembly 3 are increased due to the radial force generated by the bending deformation of the roll shaft 1 . Preferably, a gasket 13 is respectively provided between the outer ring of the rolling bearing 10 and the bearing seat II 9 and the outer bearing cap 11, and the radial sliding of the gasket 13 further prevents the rolling bearing 10 from bearing radial force.

Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that it can be described in terms of form and Various changes may be made in the details without departing from the scope of the invention defined by the claims.

Claims (8)

1. A self-adaptive roll group, comprising a roll shaft, the two ends of the roll shaft are respectively provided with an oil film bearing assembly for radially supporting the roll shaft, and the end journal of the roll shaft is provided with an oil film bearing assembly for axially positioning the roll shaft The rolling bearing assembly is characterized in that: the oil film bearing assembly includes a bearing seat I, an inner shaft sleeve arranged in the bearing seat I, and an oil film bearing fixedly installed on the inner peripheral wall of the inner shaft sleeve, and the outer circumference of the inner shaft sleeve A spherical fit structure is provided between the wall and the inner peripheral wall of the bearing seat 1, and the oil film bearing is sleeved on the roll shaft. 2. The self-adaptive roll set according to claim 1, characterized in that: the oil film bearing assembly also includes an outer shaft sleeve fixedly installed on the inner peripheral wall of the bearing housing 1, and the spherical fitting structure is arranged on the between the inner and outer bushings. 3. The self-adaptive roll set according to claim 2, characterized in that: the spherical surface fitting structure includes a convex spherical surface arranged on the outer peripheral wall of the inner bushing and protruding outward, and a convex spherical surface arranged in the outer bushing A concave spherical surface on the peripheral wall and matched with the convex spherical surface. 4. The self-adaptive roll set according to claim 3, characterized in that: the outer bushing is divided into two sections, and the interface between the two sections of the outer bushing is perpendicular to its axis and parallel to the concave spherical surface The planes of symmetry coincide. 5. The self-adaptive roll set according to claim 4, characterized in that: the inner peripheral wall of the bearing housing I is provided with snap rings for clamping the two ends of the outer sleeve. 6. The self-adaptive roll set according to any one of claims 1-5, characterized in that: the rolling bearing assembly includes bearing housing II, installed in the bearing housing II and sleeved on the end of the roll shaft The rolling bearing on the journal, the outer bearing cover fixedly installed on the bearing seat II and used to cooperate with the end surface of the outer ring of the rolling bearing, and the inner bearing fixedly installed on the end surface of the roll shaft and used to cooperate with the end surface of the inner ring of the rolling bearing build. 7. The self-adaptive roll set according to claim 6, characterized in that: there is a gap for the radial movement of the rolling bearing between the bearing seat II and the rolling bearing. 8. The self-adaptive roll set according to claim 7, characterized in that: gaskets are respectively provided between the outer ring of the rolling bearing, the bearing seat II and the outer bearing cover.

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