RU2632347C2 - Pipe cold rolling mill - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: mill comprises a frame in which there is a working stand with rolls, a drive mechanism connected by a housing to the frame and by connecting rods to the working stand, front and intermediate cartridges and a main drive located on frame, which is connected to the input shaft of the drive mechanism by a coupling. The working stand with rolls has the ability to reciprocate along the frame guides. The main drive frame is rigidly connected to the body of the drive mechanism by means of a protrusion on its end face with a bearing surface and a groove with a projection on the side of the body of the drive mechanism. The coupling is made in the form of a gear sleeve and a gear block engaged with it, fitted with interference, respectively on the output shaft of the main drive and the input shaft of the drive mechanism or on the input shaft of the drive mechanism and the output shaft of the main drive.

EFFECT: increased reliability and durability of the equipment as a result of increasing the accuracy of alignment of the shafts to be connected.

7 dwg

Description

The invention relates to the field of metal forming, and more specifically to mills for cold rolling pipes.

Known cold rolling mill, see Japan patent No. 62130704, class. B21B 21/00, claimed November 30, 1985, publ. 06/13/1987, which contains a frame with a working stand with rolls located in it, with the possibility of reciprocating movement along the guides, a drive mechanism connected by a housing with a frame and rods with a working stand, front and intermediate cartridges, the main drive placed on the frame including electric motor, gearbox and belt drive connecting the drive mechanism to the main drive.

A disadvantage of the known design of the cold pipe rolling mill is that the use of a belt drive for connecting the drive mechanism to the main drive leads to a decrease in reliability and durability, an increase in production space and a limitation of the technological capabilities of the mill, for the following reasons:

- a pulsating torque acts on the belt drive, which causes the belt to slip over the pulleys, intensive wear of the belt, pulleys and subsequent emergency stop of the mill;

- due to the need to ensure good adhesion of the belt to the driving pulley, the driving pulley together with the main drive moves away a large distance from the driven pulley mounted on the shaft of the drive mechanism, which increases the dimensions of the mill;

- belt drive is limited in application in terms of the applied torque to the mechanisms and cannot be effectively used in cold rolling mills of medium and large sizes, as well as when rolling pipes from difficult to deform materials.

Of the known closest in technical essence is the cold pipe rolling mill described in US patent No. 3211027, CL. B21B, claimed 06/06/1958, publ. 10/12/1965

A well-known cold pipe rolling mill comprises a bed in which a working stand with reciprocating cages with rolls is placed, front and intermediate chucks, a drive mechanism connected by a housing to the frame and connecting rods to the working stand, and a main drive, the output shaft of which is connected to the input shaft drive shaft through a pneumatic clutch. The main drive contains an electric motor, a clutch, a gearbox.

A disadvantage of the known cold rolling mill is the inability to provide the required alignment of the output shaft of the main drive with the input shaft of the drive mechanism, which reduces the reliability and durability of the mill, complicates the installation of equipment.

The alignment of the shafts depends on the accuracy of the alignment of the drive housing with the foundation frame of the main drive. During the final pouring of concrete exposed to the required accuracy due to the lack of docking of the drive mechanism housing with the foundation frame of the main drive, inevitable displacements of the housing and frame relative to each other occur, which leads to excessive skew and displacement of the connected shafts, premature wear of the pneumatic coupling.

To reduce the deviation from the alignment of the shafts, it is necessary to fix them more securely to the foundation before the concrete is finally poured by the drive mechanism housing and the foundation frame of the main drive, which leads to an increase in the time and laboriousness of the installation of the mill.

A further drawback of the known construction of a cold pipe rolling mill is that the use of a pneumatic coupling for connecting / disconnecting the shafts of the main drive and the drive mechanism also reduces the reliability and durability of the cold pipe rolling mill, and worsens the working conditions of maintenance personnel.

The pneumatic clutch is complex due to the presence of moving parts, which under the influence of a pulsating torque are intensively broken, the coupling is destroyed.

The operation of the pneumatic clutch when connecting / disconnecting the shafts is accompanied by a loud hiss of compressed air, exceeding sanitary standards in terms of noise, which worsens working conditions and adversely affects the health of staff.

The objective of the present invention is to create a cold rolling mill, which improves reliability and durability due to the exact alignment of the connected shafts and by replacing the design of the coupling connecting the output shaft of the main drive to the input shaft of the drive mechanism.

The next objective of the invention is to improve the working conditions of staff by reducing noise during operation of the mill.

The problem is achieved in that in a cold rolling mill of pipes containing a bed, in which a working stand with rolls reciprocally moving along the rails is placed, a drive mechanism connected by a housing to the bed and rods with a working stand, front and intermediate cartridges, and placed on the main drive frame connected to the input shaft of the drive mechanism by a coupling according to the invention, the main drive frame is connected to the drive mechanism housing by means of an end face a protrusion with a supporting surface, and on the side of the housing of the drive mechanism a groove with a protrusion for said protrusion with the supporting surface of the frame is made, and, in addition, the coupling is made in the form of a gear sleeve and a gear ring engaged with it, fitted with an interference fit, respectively, at the output the main drive shaft and the input shaft of the drive mechanism or on the input shaft of the drive mechanism and the output shaft of the main drive.

Such a constructive implementation of the cold pipe rolling mill can improve its reliability and durability by ensuring the accuracy of the connection of the output shaft of the main drive and the input shaft of the drive mechanism.

This is achieved by the fact that the main drive frame is rigidly connected to the drive mechanism housing by means of a protrusion made on the front side of the frame with a support surface, and a groove on the side of the drive mechanism housing with a protrusion under said protrusion with a support surface, wherein the main drive frame and the drive housing mechanism pulled together by bolts in place of the connector.

In addition, this is also achieved due to the structural design of the coupling connecting the output shaft of the main drive and the input shaft of the drive mechanism.

The proposed constructive solution of the cold pipe rolling mill allows to improve the working conditions of staff by reducing noise during its operation.

To explain the invention, a specific embodiment of the invention is provided below with reference to the accompanying drawings, in which:

in FIG. 1 shows a cold rolling mill, top view;

in FIG. 2 is a section AA in FIG. one;

in FIG. 3 - the same in which the main drive contains an electric motor connected through a coupling with a drive mechanism made in the form of a crank shaft with an integrated gearbox;

in FIG. 4 - place B in FIG. 2;

in FIG. 5 is a section BB of FIG. four;

in FIG. 6 is a section GG in FIG. 5;

in FIG. 7 - place D in FIG. 3.

The cold tube rolling mill comprises a frame 1, in which a working stand 2 with rolls 3 is placed, a drive mechanism 4 connected by a housing 5 to the frame 1 and connecting rods 6 with a working stand 2, front 7 and intermediate 8 cartridges, and the main drive placed on the frame 9 10, connected to the input shaft 11 of the drive mechanism 4 by a coupling 12. The working stand 2 with the rollers 3 has the possibility of reciprocating movement along the guides 13 of the frame 1. The frame 9 of the main drive 10 is rigidly connected to the housing 5 of the drive mechanism 4 by means of tsevoy side protrusion with an abutment surface 14 "a." Moreover, on the side of the housing 5 of the drive mechanism 4, a groove 15 is made with a protrusion 16 for the said protrusion 14 with the supporting surface "a" of the frame 9. The protrusion 14 is fixed in the groove 15 with bolts 17. The coupling 12 is made in the form of a gear sleeve 18 and incoming with it meshing the gear ring 19 installed with an interference fit on the connected shafts, namely the gear sleeve 18 is mounted on the output shaft 20 of the main drive 10, the gear ring 19 on the input shaft 11 of the drive mechanism 4 or the gear sleeve 18 is mounted on the input shaft 11 of the drive mechanism 4, and gear Boim 19 on the output shaft 20 of the main drive 10.

The main drive 10 can be made in the form of an electric motor 21 connected through a clutch 22 with a gearbox 23 or in the form of a single electric motor 24.

The drive mechanism 4 can be made in the form of a crankshaft 24 or a crank shaft 25 with an integrated gearbox 26.

The cold pipe rolling mill operates as follows.

When rolling pipes, the main drive 10 through the coupling 12 rotates the drive mechanism 4, which through the connecting rods 6 reports the reciprocating movement of the working stand 2 with rolls 3 along the guides 13 of the frame 1. A pulsating torque is applied to the coupling 12, while there is a misalignment of the output shaft 20 the main drive 10 with the input shaft 11 of the drive mechanism 4, approved during installation of the mill equipment. The pulsating torque and misalignment of the mating shafts are causes of increased noise and intense wear of the gear between the sleeve 18 and the sleeve 19 of the sleeve 12. To reduce noise and wear of the sleeve 12, the frame 9 of the main drive 10 is rigidly connected to the housing 5 of the drive mechanism 4 by installing the protrusion 14 of the frame 9 into the groove 15 of the housing 5 of the drive mechanism 4 and the bearing surface “a” of the frame 9 to the protrusion 16 of the housing 5 of the drive mechanism 4 with a tightening of the connector with bolts 17. In addition, the gear sleeve 18 and the clip 19 of the coupling 12 are mounted on the coupling mye shafts 20, 11 of the main actuator 10 and the actuator 4 with an interference fit.

This design ensures high alignment of the output shaft 20 of the main drive 10 with the input shaft 11 of the drive mechanism 4, reduces noise and wear of the coupling 12.

The proposed cold pipe rolling mill in comparison with the known ones allows to increase its reliability and durability by ensuring accurate alignment of the connected shafts and by replacing the design of the coupling connecting the output shaft of the main drive to the input shaft of the drive mechanism.

The proposed design of the cold pipe rolling mill can also improve the working conditions of staff by reducing noise during operation.

Claims (1)

A cold tube rolling mill, comprising a bed, in which a working stand with rolls is moved along the guides, a drive mechanism, the housing of which is connected to the bed, and the connecting rods to the working stand, front and intermediate cartridges, and the main drive placed on the frame, connected to the input shaft of the drive mechanism by a coupling, characterized in that the frame of the main drive is connected to the housing of the drive mechanism through a protrusion made on its end side with a supporting surface, and on the side on the other side of the housing of the drive mechanism, a groove is made with a protrusion for the said protrusion with the supporting surface of the frame, while the clutch is made in the form of a gear sleeve and a gear ring engaged with it, fitted with an interference fit, respectively, the gear sleeve on the output shaft of the main drive and the gear ring - on the input shaft of the drive mechanism or gear sleeve - on the input shaft of the drive mechanism and the gear race - on the output shaft of the main drive.

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