RU2308331C2 - Centering roller-type apparatus of tube rolling mill - Google Patents

Abstract

FIELD: roller type centering apparatuses for enlarging possibilities of blank centering in tube rolling mill.

SUBSTANCE: centering apparatus includes housing; jointly mounted in housing rocking two-arm lever with upper centering roller; jointly coupled one to other through timing tie rod two-arm and three-arm levers with lower centering rollers; drive unit for closing and opening lever arms; screw type limiter of roller positions. Effective adjustment of equipment to desired size, extraction of pierced billet from upward and from lateral side are provided due to improved design of centering apparatus. The last has hydraulic cylinder whose body is mounted on arm of rocking two-arm lever with upper centering roller and whose rod is jointly coupled with three-arm lever carrying lower centering roller. Screw type limiter of centering apparatus is provided with electromechanical drive and it is mounted in housing with possibility of engaging with stop placed on timing tie rod.

EFFECT: improved design of centering apparatus, enlarged possibilities of blank centering.

3 dwg

Description

The invention relates to the field of pipe production and relates to the improvement of roller centering devices installed behind the stand of pipe rolling mills.

Known roller centralizer tube mill, see and.with. USSR No. 192739, class B21B 17/04, claimed 01/07/65, op. 03/02/67, containing a bed, two two-shoulders and one three-shoulder levers with centering rollers pivotally mounted on the bed, synchronizing rods, pivotally interconnecting levers, a drive for reducing and raising levers.

The disadvantage of this device is the limited range of disclosure of the levers with rollers, which does not allow the ejection of the sleeve and the rod both up and sideways.

In addition, such a design of the centering device does not allow replacing the centering rollers in the mill line, and they have to be replaced in the centering unit remote from the rolling line, which complicates its maintenance and increases the time of replacing the rollers.

Of the known roller centralizers of pipe rolling mills, the closest in technical essence is the roller centralizer of the pipe rolling mill described in A.S. USSR No. 1405167, cl. B21B 25/02, z. 11/26/86

This roller centering device comprises a bed, a swinging two-arm lever with an upper centering roller pivotally mounted on the bed, two-arm and three-arm levers with lower centering rollers, synchronizing rods, pivotally linking levers, a drive of information and breeding levers, two additional piston cylinders mounted on the frame hollow rods in which screw limiters of the position of the rollers are placed, while the three-arm lever and rod are made with protrusions interacting with screw by the borders.

A disadvantage of the known design of the centering roller of the tube mill is the inability to quickly adjust the centering rollers to the required size of the rod or sleeve due to its complexity, which consists of two piston cylinders with two manually adjustable screw stops, which in turn are also the rods of the piston cylinders, and this complicates the maintenance of the mill.

Another disadvantage of the known design of the roller centering device is its limited technological capabilities due to the inability to open the levers with rollers for the vertical extraction of the sleeve and the rod.

In addition, this centralizer design makes it difficult to replace the centering rollers in the mill line, and you have to replace them in a centralizer remote from the rolling line, which makes it difficult to maintain and increases the time to replace the rollers.

The objective of the present invention is to provide a roller centralizer pipe mill, which allows to expand the technological capabilities of the centralizer and improve its service conditions.

This object is achieved in that the roller centering of the tube mill, containing the bed, pivotally mounted on the bed, a swinging two-arm lever with an upper centering roller, pivotally connected to each other by a synchronizing rod, two-arm and three-arm levers, a drive for reducing and breeding the levers and a screw limiter for the position of the rollers, according to the invention equipped with a hydraulic cylinder, the body of which is mounted on the shoulder of a swinging two-arm lever with an upper centering roller, and the rod is articulated with a three-armed lever carrying the lower centering roller, moreover, is configured with a screw stopper and an electromechanical actuator is mounted on the frame to cooperate with a stop located on the synchronization rod.

Such a structural embodiment of the roller centering of the tube mill allows you to quickly adjust the centering rollers to the required size of the rod or sleeve due to the fact that the adjustable screw stop is made with an electromechanical drive and is easy to maintain.

This design solution also allows you to use the centralizer separately for centering the rod, and for centering the sleeve.

In addition, this structural design of the roller centering allows the removal of the stitched sleeve and the rod both up and sideways, thereby expanding its technological capabilities, as well as in cases of emergency.

Such a constructive solution also makes it easy to replace the centering rollers in the mill line without removing the centralizer from the rolling line, which facilitates its maintenance.

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 roller centering when centering the rod, in a section;

figure 2 - roller centering when centering the sleeve, in the context;

figure 3 - roller centering with lateral issuance of the sleeve and the rod or replacing the rollers, in the context.

The roller centering of the tube mill comprises a frame 1, a swinging two-arm lever 2, a two-arm lever 3 and a three-arm lever 4 with upper centering roller 5 and lower centering rollers 6 and 7 respectively mounted at their ends, pivotally mounted on the frame 1. The levers 3 and 4 are interconnected by a synchronizing rod 8, and the levers 2 and 4 are connected by a hydraulic cylinder 9, the housing 10 of which is pivotally mounted on one of the arms of the swinging two-arm lever 2, and its rod 11, which is simultaneously an adjustable rod, is pivotally connected to the three-arm lever 4 The levers 2, 3 and 4 have an actuator in the form of a hydraulic cylinder 12 for mixing and breeding rollers 5, 6, 7. In addition, the roller centering device contains a screw limiter 13 of the position of the rollers with an electromechanical drive 14 mounted on the frame 1, as well as a stop 15, executed on synchronizing rod 8 in the form of a tide.

The roller centralizer can work separately for both centering the shaft and centering the sleeve.

When adjusting the centering device for centering the rod 16 (Fig. 1), the rollers 5, 6, 7 are brought to the rod 16 in a plane perpendicular to the rolling axis by means of levers 2, 3, 4 from the hydraulic cylinders 9 and 12, into the piston cavity of which pressure is applied, and the rod 11 of the hydraulic cylinder 9 as a result occupies an extreme lower position, acting as an unregulated traction.

When adjusting the centering device for centering the sleeve 17 (Fig. 2), the rollers 5, 6, 7 are adjusted to the required size of the sleeve 17 using levers 2, 3, 4 from the hydraulic cylinders 9 and 12 and a screw stop 13 interacting with the stop 15.

At the beginning of the rolling process under the action of pressure in the piston cavities of the cylinders 9 and 12, the centering rollers 5, 6, 7 clamp the rod 16 (figure 1). When the sleeve 17 approaches, the centering rollers are bred by applying pressure to the piston cavity of the hydraulic cylinder 9 and to the rod cavity of the hydraulic cylinder 12, while the levers 2, 3 and 4 with the rollers 5, 6 and 7 are rotated around the hinge axes fixed in the frame 1 and form a caliber, the centering sleeve, while the synchronizing rod 8 with a stop 15 in contact with the screw limiter 13 (figure 2). After the axial delivery of the rolled sleeve, the piston cavity of the hydraulic cylinder 12 is again supplied with pressure and the centering rollers 6 and 7 are reduced to the rod clamp.

If it is necessary to replace the centering rollers or during the operation of the tube mill with lateral delivery of sleeves and rods after the end of the rolling of the sleeve, pressure is supplied to the rod cavity of the hydraulic cylinder 9, the rod 11 is pulled into the cylinder body 10 and the upper centering roller 5 is opened using the lever 2 (Fig. 3) . After replacing the rollers or performing lateral delivery of the sleeve and the rod, pressure is applied to the piston cavities of the hydraulic cylinders 9 and 12 and the centering rollers are again transferred to the clamping position of the rod.

The proposed roller centralizer of the tube mill compared with the known ones allows to expand the technological capabilities of the centralizer and improve its service conditions.

Claims (1)

A roller centering device for a tube rolling mill, comprising a bed, a swinging two-arm lever with an upper centering roller pivotally mounted on the frame, two-shoulders and a three-arm levers with lower centering rollers pivotally connected to each other by a linking and breeding drive and a screw limiter for the position of the rollers, which it is equipped with a hydraulic cylinder, the body of which is mounted on the shoulder of a swinging two-arm lever with an upper centering roller, and the rod is pivotally connected to arm with a lower centering roller, in addition, the screw limiter is made with an electromechanical drive and is mounted on a bed with the ability to interact with a stop located on a synchronizing rod.

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