RU2167012C2 - Arresting and regulating mechanism of cross screw rolling mill - Google Patents

Abstract

FIELD: rolled tube production, namely arresting and regulating mechanisms of cross screw rolling mills. SUBSTANCE: mechanism includes frame, arresting head hinged by means of drive unit, end cover and arresting lock. In body of head stepped spindle is mounted in rolling bearings, it carries thrust roller bearing. End cover has base in the form of ring and П-shaped bridge rigidly joined with base; base and bridge form window between them. End cover has two different-diameter turnings having sealings and concentric relative to steps of spindle. Stem of spindle has threaded portion, nuts placed in said portion, in window of cover and intermediate sleeve arranged between nut and rolling bearing unit. Mechanism allows to reduce additional time period for regulating bearing unit. EFFECT: enhanced efficiency. 3 dwg

Description

 The invention relates to the field of pipe production, and in particular to the designs of thrust-adjusting mechanisms of pipe mills.

 Known thrust mechanism of the mandrel of the mandrel of a rolling mill (see ed. Certificate of the USSR N 1090467, class B 21 B 25/02, decl. 05.11.82), including a thrust head mounted in it a rolling bearing with two spheres - tapered thrust bearings, mounted in cooperation with the outer rings, a spindle with a fifth under the shank of the mandrel bar attached to the housing, covering the spindle with a hollow pin, a drive lock and pipelines for supplying coolant.

 In a known design, it is possible to pull up a tapered bearing. However, due to the supply of coolant through the pipeline in the presence of significant dynamic loads, the fastenings of the pipeline will fail, which will lead to equipment downtime and adversely affect the performance of the mill.

 Of the known thrust mechanisms of the mandrel rod of the helical rolling mill, the closest in technical essence is the thrust-adjusting mechanism of the helical rolling mill described in ed. testimonial. USSR N 1576215, class B 21 B 25/02, claimed 05/07/88

 This thrust-adjusting mechanism of the cross-helical rolling mill comprises a bed, a thrust head folding therefrom from the drive, and a thrust lock mounted on it. Water supply channels are made in the housing of the thrust head and a stepped spindle mounted on rolling bearings, bearing a thrust roller bearing, rotating with a central water cooling channel, is installed. In the lid mounted on the end face of the hinged thrust head housing, there are two concentric axes of the bore spindle with seals placed in them, forming a chamber with a through drain hole.

 A disadvantage of the known design of the thrust-adjusting mechanism of the helical rolling mill is the large loss of time when adjusting the gaps in the thrust bearing, due to the need to remove the end sealing cover. This reduces the productivity of the mill.

 The objective of the present invention is to provide a device that allows you to reduce the auxiliary time for adjusting the bearing and, thereby, increase the productivity of the mill.

 The task is achieved by the fact that in the thrust-adjusting mechanism of the cross-helical rolling mill, comprising a bed, a carriage mounted on it, having a thrust head that is hinged from the drive, in the housing of which a rotating step spindle is mounted on rolling bearings, bearing a thrust roller bearing, an end cover in which two bores of different diameters with seals placed therein are concentric to the spindle steps, and the stop lock, according to the invention, the cover consists of a base made in the form of a ring and a U-shaped jumper rigidly connected to it with coolant channels that form a window between them, one of the lid bores with a seal is located in the base, and the second in the jumper, and a thread is made on the spindle tail for placement on an adjusting nut with a lock nut and an intermediate sleeve is installed, while the tail end of the spindle with these nuts is located in the window of the end cover, and the intermediate sleeve is located between the adjusting nut and the rolling bearing with the contact of its outer surface with the inner surface of the seal located at the base of the end cap.

 Such a constructive implementation of the thrust-adjusting mechanism of the cross-helical rolling mill allows reducing the time for adjusting the bearing and increasing the productivity of the mill.

 This is achieved due to the possibility of operational control and timely adjustment of the clearance in the thrust bearing of the head of the thrust-adjusting mechanism. This will increase the bearing life, reduce downtime caused by the need to disassemble the mechanism to carry out the above operations.

To explain the invention, a specific embodiment of the invention is given below with reference to the accompanying drawings, of which:
figure 1 shows the thrust-adjusting mechanism, a longitudinal section;
figure 2 is the same, plan view;
figure 3 is a view along arrow a in figure 1;
figure 4 - construction of the thrust head in section.

 The thrust-adjusting mechanism of the cross-helical rolling mill consists of a bed 1, a carriage 2 mounted on it, having a thrust head 4 hinged from the drive 3. A rotating step spindle 6 is mounted on the rolling bearings 7, 8, bearing a thrust roller, in the housing 5 of the thrust head 4 bearing 9. Housing 5 has an end cap 10.

 The end cover 10 consists of a base made in the form of a ring and a U-shaped jumper rigidly connected to it, which form a window between them. In the end cap 10 concentric to the spindle steps, two bores of different diameters with seals 11, 12 are made. One of the bores of the cap with a seal 11 is located in the base, and the other in the jumper. The head 4 is closed by a stop lock 13 during the rolling process.

 A thread is made on the tail end of the spindle 6 to accommodate an adjusting nut 14 with a lock nut 15 on it and an intermediate sleeve 16 is installed. The tail end of the spindle 6 and the adjusting nut 14 with a lock nut 15 are located in the window of the end cover 10. The intermediate sleeve 16 is located between the adjusting nut 14 and a rolling bearing 8 and contacts its outer surface with the inner surface of the seal 11 located at the base of the end cap 10.

 In the thrust head 4 and the end cover 10 channels 17 are made for supplying coolant to the spindle 6.

The device operates as follows:
At the time of rolling, the head 4 is closed by a folding stop lock 13. After the rolling process is completed, the lock 13 is tilted, the head 4, with the help of a rotation drive 3, also tilts to the extreme position, sufficient for passing the sleeve or the rod, depending on the way the output side works.

 In the process of rolling, axial forces are absorbed by a thrust bearing 9 with tapered rollers, which requires a constant minimum guaranteed clearance in it, which is ensured by free access to the adjusting nut 14 and lock nut 15 located on the spindle shank 6 in the end cap window 10 .

 Seals 12 located in the U-shaped jumper provide a reliable supply of coolant to the rotating spindle 6 and further to the shaft. Seals 11 located at the base of the cover 10 protect the bearing assemblies of the spindle 6 from ingress of water and scale. At the same time, the window of the cover 10 serves to drain the water that does not fall into the spindle 6.

 The proposed thrust-adjusting mechanism of the cross-helical rolling mill in comparison with the known ones allows to increase the productivity of the mill by reducing the auxiliary time when adjusting the bearing.

Claims (1)

 The thrust-adjusting mechanism of a cross-helical rolling mill, comprising a bed, a carriage mounted on it, having a thrust head tilting from the drive, in the housing of which a rotating step spindle is mounted on rolling bearings, bearing a thrust roller bearing, an end cover in which concentric steps of the spindle are made two bores of different diameters with seals placed in them, and a stop lock, characterized in that the cover consists of a base made in the form of a ring and rigidly connected to it P -shaped jumpers with coolant channels forming a window between themselves, one of the lid bores with a seal is located in the base, and the second in the jumper, and a thread is made on the spindle tail to accommodate the adjusting nut with a lock nut on it and an intermediate sleeve is installed, the tail part of the spindle with said nuts is located in the window of the end cover, and the intermediate sleeve is located between the adjusting nut and the rolling bearing with the possibility of contacting its outer surface ty with the inner surface of the seal located at the base of the end cap.

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