RU2308329C2 - Screw rolling mill main line - Google Patents

Abstract

FIELD: rolled stock production, namely in main lines of screw rolling mills for making tubes and round bars.

SUBSTANCE: main line includes working stand with rolls whose flanges are joined universal spindles. Articulation joints of each spindle are mutually joined through solid shaft, hydraulic cylinders for moving spindles along their axes and drive unit. At side of working stand under each universal spindle supporting rollers are mounted; said rollers are provided with rocking drive from hydraulic cylinders. Spindles are joined with drive unit through intermediate shafts mounted in bearing assemblies of bodies mounted in supporting frame. Hydraulic cylinders for moving spindles are mounted in pairs in turnings of bodies of bearing assemblies of intermediate shafts arranged near spindles. On end portions of rods of each pair of hydraulic cylinders profiled board is mounted with possibility of moving relative to intermediate shaft and having central opening and supporting roller resting upon bracket mounted in body of bearing assembly. On boss of flange mounted movably on end portion of intermediate shaft two annular pins are fastened for restricting motion of profiled board.

EFFECT: shortened idle periods of equipment, reduced number of changes of worn universal spindles, improved maintaining condition.

5 dwg

Description

The invention relates to the field of metal forming, and more specifically to rolling production, and can be most effectively used in the main lines of screw rolling mills in the production of pipes and round grades.

The main line of the ball rolling mill is known, see copyright certificate No. 1655030, class. BHH 1/14, declared 04.24.89 g., Publ. 05/20/99 g.

This line contains a working stand with rolls connected to universal spindles, which are connected to the drive through intermediate shafts, as well as a rotation mechanism of one roll relative to another.

The disadvantage of this design is the significant downtime associated with the use of manual labor and a workshop crane during transshipment of rolls in the working stand, when it is necessary to "pull" the universal spindles from the ends of the drive shafts of the work rolls. During this operation, supporting each universal spindle alternately with a lifting crane, manually disconnect them from the drive shafts of the work rolls, which, when equipped with mating equipment (for example, loading and unloading tables, vehicles, transmission equipment, etc.), causes great difficulties for the staff .

Another drawback of this line is the significant unproductive downtime of equipment associated with the low durability of universal spindles and their frequent replacement, which is especially important in heavily loaded rolling mills, where the mass of the spindle can reach 10 tons or more.

This drawback is due to the fact that to compensate for the change in the distance between the joints of the universal spindle for various settings of the rolls of the stands of the working line of the rolling mill, which is especially characteristic of helical rolling mills, the spindle shaft itself is made of two parts, movably connected to each other by means of a spline or what - any other compound, which reduces its rigidity and durability and requires frequent replacement.

Of the known closest in technical essence is the main line of the rolling mill described in US patent No. 4118967, class. 72-239, claimed 07/25/77, publ. 10/10/78 g.

The known line contains a working stand with rolls, the flanges of which are connected to universal spindles, hydraulic cylinders for moving the spindles along their axes and a drive. Each of the hydraulic cylinders for moving the spindles is mounted on two racks of the frame, in the guides of which, with the possibility of moving from these hydraulic cylinders, two carts are placed, each carrying a locking head with a hydraulic clamp. Carts with lock heads are located outside the working area of universal spindles. Hinges of universal spindles connecting the rolls to the drive of the working stand are fixed on the necks of the rolls of the working stand.

During transshipment, the rolls of the working stand are separated from the rolling axis, while the spindle hinges are oriented in the lock heads and fixed with hydraulic clamps, after which the hydraulic cylinders move the carts with the lock heads and the spindle pivots clamped in them along the axis of the spindle shafts, moving the hinges from the drive cages of the work roll rolls to the required distance, thereby allowing unhindered transshipment of the rolls of the working stand.

A disadvantage of the known design of the main line of the helical rolling mill is the significant unproductive downtime of the rolling mill when replacing spindles due to the fact that the hydraulic cylinders for moving universal spindles are mounted on frame racks, which covers both the spindles and the technological equipment adjacent to the working stand (for example , front or rear table of the rolling mill).

Significant unproductive downtime of the rolling mill is also associated with the frequent replacement of spindles due to their low durability, especially in heavily loaded rolling mills, where the spindle mass is more than 10 tons. This is because in order to change the distance between the joints of the universal spindle during the settings of the rolls of the rolling mill, the spindle shaft is made of two parts, movably connected to each other, for example, by a spline connection, which reduces its rigidity and durability and requires frequent replacement.

The presence of a movable joint determines the presence of a guaranteed lateral clearance in it and, as a result, the shaft deflection in this joint under the influence of gravity. During operation, when the spindle rotates in one revolution, the sign of the shaft deflection occurs twice, which causes a dynamic vibrational load acting on the spline (or other) movable joint, but more negatively, these loads are transferred to the bearings of the universal spindle hinges, which are already loaded with significant (static and dynamic) loads, transmitting torque from the rolls of the working stand to the drive.

The presence of a frame located on four racks and covering the spindles and equipment adjacent to them greatly complicates the work of the maintenance staff when using a crane while replacing worn spindles with new ones, which is especially true on heavily loaded rolling mills, and leads to significant loss of working time.

Similar losses of working time can occur in emergency situations, when a crane needs to remove either a blank or a stuck rolled product from under the mentioned frame.

The objective of the present invention is to create the main line of the helical rolling mill, which allows to reduce unproductive downtimes of the helical rolling mill associated with the cost of working time when transferring the rolls to disconnect (connect) the flanges of the working stand rolls and universal spindles without the need for a crane and with reducing the number of replacements for worn spindles with new ones.

The task is achieved in that the main line of the screw rolling mill, comprising a working stand with rolls connected by their flanges to universal spindles, hinges of each of which are connected by a shaft, hydraulic cylinders for moving the spindles along their axes and a drive, according to the invention, is provided located on the working side stands under each universal spindle with supporting rollers with a swing drive from hydraulic cylinders and connecting spindles to the drive with intermediate shafts placed in bearings the bearings of the housings mounted on the support frame, and the spindle displacement cylinders are installed in pairs in bores made in the bearing housings of the intermediate shafts located near the universal spindles, while at the ends of the rods of each pair of hydraulic cylinders there is a profile board installed with the ability to move relative to the intermediate shaft with the central hole and the support roller resting on the bracket mounted on the bearing housing, and on the flange hub, install ennogo movably on the end of the intermediate shaft, two annular tabs secured to limit movement of a profile board, the shaft being configured Tselikov universal spindle.

Such a constructive implementation of the main line of the helical rolling mill will reduce unproductive downtime of the rolling mill by reducing the loss of working time when transferring the rolls to disconnect (connect) the flanges of the working stand rolls and universal spindle joints without using a workshop crane and reducing the number of replacements for worn spindles.

This is achieved by the fact that the movement of each spindle is carried out from two hydraulic cylinders mounted on a support column of the intermediate shaft, and the retention of each spindle is carried out by a supporting roller placed under it with a drive of its height adjustment.

In addition, due to the fact that the intermediate shaft flange on the hinge side of the universal spindle is mounted movably relative to the intermediate shaft, it is possible to use the universal spindle shaft as a whole and, thereby, significantly reduce vibrational dynamic loads on the spindle assemblies, increase its durability, which will reduce its number replacements and time spent on this operation.

The proposed solution will also improve service conditions when using a crane during the replacement of worn spindles with new and emergency situations when removing chilled workpieces or stuck rolled products.

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

figure 1 shows a General view of the main line of the rolling mill;

figure 2 is a section aa in figure 1;

figure 3 is a section bB (rotated) in figure 2;

figure 4 is a section bb in figure 1;

figure 5 - place G in figure 1 on an enlarged scale.

The main line of the screw rolling mill contains a working stand 1 with rolls 2, the drive necks 3 of which are provided with flanges 4, connected by fasteners 5 with the corresponding flanges 6 of the universal spindles 7, hinges 8, 9 of each of which are connected together by an entire rigid shaft 10. Hinges 9 their flanges 11 are rigidly connected to the flanges 12, movably mounted on the intermediate shafts 13 located in the bearing bearings 14 of the housings 15, 16 mounted on the support frame 17. The intermediate shafts 13 by means of gear couplings 18 are connected us with a drive comprising a gear-motor 19 and stand 20. The bore of the body 15, the bearing 16 supports the intermediate shaft 13 mounted in pairs cylinders 21 move along their axes of spindles. At the ends of the rods 22 of each pair of hydraulic cylinders 21, a profile board 23 is mounted that can be moved relative to the intermediate shaft and has a central hole, the diameter of which exceeds the diameter of the hub 24 of the flange 12. Two ring keys 25 are rigidly fixed to the hub 24 to limit the movement of the profile board 23. The profile board 23 is equipped with a support roller 26 in contact with the bracket 27 mounted on the housing 15 of the bearing bearings 14 and unloading the rods 22 of the hydraulic cylinders 21 from the cantilever load profile weight th board 23.

Each flange 6 of the hinge of the universal spindles 7 on the side of the working stand is equipped with a rigidly fixed conical pin 28, and a conical funnel 29 is made in the flange 4 of the drive neck 3 of each roll 2, which facilitates the centering of the flanges 4 and 6 when connecting the spindles 7 to the rollers 2.

On the side of the working stand 1, under each universal spindle 7, there is an idle supporting roller 30 with a swing drive from the hydraulic cylinder 31, which serves to hold the spindle to the canopy during transshipment, as well as to accurately correct its position in the vertical plane during the disconnection (connection) of the flanges 4 and 6.

During rolling, rotation and torque to the rolls 2 of the working stand 1 are transmitted from the electric motor 20, the gear stand 19 through gear couplings 18, the intermediate shafts 13 and universal spindles 7, the flanges 6 and 11 of which are fastened to the flanges 4 of the rolls 2 and the flanges 12 of the intermediate shafts 13. The mobility of the flanges 12 relative to the intermediate shafts 13 compensates for the change in the three spatial coordinates of the hinges 8 of the universal spindles 7 with different movements of the rolls 2 when changing the settings and working stand 1. To exclude mechanical friction, the support rollers 30 are lowered, and the profile board 23 is in the middle position between the split ring keys 25.

When transshipment of rolls 2, the mechanisms of the working stand 1 are moved to the “transshipment position” when the universal spindles 7 are spatially located above the supporting rollers 30, which are then lifted by the hydraulic cylinders 31 to come into contact with the universal spindles 7, after which the fasteners 5 are pulled which tighten the flange 4 of the roll 2 with the flange 6 of the universal spindle 7. Then, the hydraulic cylinders 21 move the profile boards 23 to the end of each in the corresponding split ring key 25 and then move the flanges 12 with the hubs 24, and accordingly respectively, and fully universal spindles 7 by the value “L”, at the same time, the flanges 4 and 6 are disconnected from the side of the rolls 2. After replacing the rolls 2 with new ones, the above operations are performed in the reverse order. The hydraulic cylinders 21 push the profile boards 23, each of which, rolling with its support roller 26 along the bracket 27 of the housing 15 and abutting against the second split ring key 25, moves the corresponding universal spindle 7 towards the working stand 1. In this case, the conical pin 28, rigidly fixed in the flange 6, falls into the zone of the conical funnel 29 of the drive neck 3 of the roll 2 and centers the flanges 6 and 4. If necessary, additional adjustment in the space of the flange 6 is possible using the support roller 30 and hydraulic cylinder 31. After that, fasteners 5 are mounted, supporting rollers 30 are lowered down, the profile board 23 is set in the middle position between two split ring keys 25. After setting up work stand 1, the working line of the helical rolling mill is ready for operation.

The replacement of worn universal spindles 7 with new ones is carried out with the help of a workshop crane. The pre-drowned universal spindle is first disconnected from the flange 4 of the roll 2, then it is moved away by means of hydraulic cylinders 21 from the working stand 1 by the value “L”, then the flanges 11 and 12 of the spindle 7 and the intermediate shaft 13 are disconnected. The new spindle is installed in the reverse order .

In the event of emergency situations, such as removing chilled billets 32 from equipment 33 adjacent to the working stand 1 or stuck rolling, free access from above is provided when using a workshop crane, as well as convenience in the work of service personnel.

The proposed main line of the screw rolling mill in comparison with the known ones will reduce unproductive downtime of equipment, reduce the number of replacements of worn universal spindles and improve service conditions.

Claims (1)

The main line of the screw rolling mill, comprising a working stand with rolls connected by their flanges to universal spindles, hinges of each of which are connected by a shaft, hydraulic cylinders for moving spindles along their axes and a drive, characterized in that it is provided located on the side of the working stand under each a universal spindle supporting rollers with a swing drive from hydraulic cylinders and connecting spindles to the drive with intermediate shafts located in the bearing bearings of the housings, installed x on the support frame, and the cylinders for moving the spindles are installed in pairs in bores made in the bearing housings of the intermediate shafts located near the universal spindles, while at the ends of the rods of each pair of hydraulic cylinders there is a profile board installed with the ability to move relative to the intermediate shaft with a central hole and a support a roller resting on a bracket mounted on a bearing housing, and on the hub of a flange mounted movably at the end of the intermediate of the shaft, two ring keys are fixed to limit the movement of the profile board, while the shaft of the universal spindle is made whole.

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