RU87108U1 - REAR TABLE OF THE TUBE MILL - Google Patents

Abstract

The back table of the rolling mill, containing the stop-adjusting mechanism for holding the mandrel bar, a drive for moving the mandrel bar in the form of an endless thread, a support for the mandrel shaft shank mounted on the trolley, and rollers supporting the mandrel bar, pivotally mounted on the levers, characterized in that the supporting rollers mounted on both sides of the mandrel rod with the possibility of information in the horizontal plane, and the axis of the levers on which they are mounted are vertically arranged and have a drive of their synchronous information, made in the form of kinematically connected to each other gear sectors and rails driven by a power cylinder.

Description

The utility model relates to pipe rolling production, and more precisely, to the working lines of screw rolling pipe mills with side pipe delivery and can be most effectively used for the production of pipes of small (<100 mm) diameter and especially thin-walled pipes having a small inner hole.

The back table of the tube mill is known, see autosvid. USSR No. 1020170, M.cl. B21B 25/02, claimed 01/29/82, publ. 05/30/83

This rear table contains a stop-adjusting mechanism for holding the reference rod, a drive for moving it in the form of an endless thread (chain) and a support for the shank of the reference rod. The support under the shank of the reference rod is made in the form of a cage with three guides that moves inside the sleeve attached to the thrust head and the second end of which is mounted with the possibility of movement in a stationary annular external support.

A disadvantage of the known design of the back table of the tube mill is that the reference rod moves with the thrust head.

The connection of the thrust head and the rod creates significant moving masses and forces to reduce the speed of their movement when removing the rod from the sleeve. This connection also necessitates the detachment of the rod from the thrust head when replacing it, which takes considerable time.

In addition, the underestimated speed of movement of the reference rod with a thrust head leads to a loss in the heating temperature of the liner, which increases heat loss.

Unproductive downtime, low speed, significant moving masses, heat loss increase the technological time of the firmware cycle, which when used in modern high-speed units significantly reduces their technological capabilities.

Of the known rear tables of the tube mill, the closest in technical essence is the rear table described in RF patent No. 2162757, M.cl. B21B 25/02, claimed 12/10/98, publ. 02/10/2001

The well-known back table of the rolling mill contains a stop-adjusting mechanism for holding the reference rod, a drive for moving it in the form of an endless thread and a support under the shank of the reference rod. The support under the shank of the mandrel rod is made in the form of a trolley on which an endless thread is fixed. The table is equipped with pivoting levers carrying pivotally mounted conical conical supporting rollers mounted with a gap between their end surfaces for arranging an endless thread between them in a fork-shaped groove of the pivoting levers.

A disadvantage of the known design of the rear table of the rolling mill is the inability to use it when rolling pipes (sleeves) with a small internal hole, which reduces the technological capabilities of the mill.

This is due to the fact that in the process of extracting the reference rod, due to the fit of the sleeve on the rod, the curvature of the sleeve due to its significant longitudinal dimensions of up to 10 m, significant axial forces arise for removing it from the sleeve. Therefore, the endless thread of the axial displacement of the rod will have dimensions comparable to the dimensions of the rod and sleeve. When rolling pipes (sleeves) with diameters comparable to the dimensions of the endless thread (we are talking about pipes of small diameter ⌀ <100 mm), it is not possible to hold the rod along the rolling axis due to the distance between the supporting rollers, which should be larger than the size of the endless thread ( chains).

Such a design of the rear table does not provide retention of the rod on the rolling axis during its task (extraction), since it will inevitably fail (fall) into the gap between the supporting rollers.

The objective of this utility model is to create a back table for a rolling mill, which allows to expand technological capabilities by using reference rods of any diametric size when rolling pipes with a small inner hole.

The task is achieved by the fact that in the rear table of the rolling mill containing a stop-adjusting mechanism for holding the reference rod, a drive for moving the reference rod in the form of an endless thread, a support for the shank of the reference rod mounted on the trolley, and rollers supporting the reference rod, pivotally mounted on the levers , according to the utility model, the supporting rollers are mounted on both sides of the reference rod with the possibility of mixing in the horizontal plane, and the axis of the levers, on which nor are they fixed, arranged vertically and have a drive for their synchronous information, made in the form of kinematically connected gear sectors and rails driven by a power cylinder.

Such a constructive implementation of the rear table of the rolling mill will expand the technological capabilities of the mill and provide rolling pipes with a small inner hole.

This is achieved due to the fact that the supporting rollers are located on both sides of the rolling axis and hold the rod when it is set or removed from the sleeve on the sides, without interfering with the movement of the endless thread (chain).

To explain the utility model, a specific example of the implementation of the utility model is given below with reference to the accompanying drawings, in which:

figure 1 - shows the back table of the rolling mill;

figure 2 is the same in plan;

figure 3 is a section aa in figure 1;

figure 4 is a view along arrow B in figure 3 (rotated);

figure 5 is a section bb in figure 3 (rotated).

The back table of the rolling mill contains a stationary frame 1, on which is mounted a stop-adjusting mechanism 2 for holding the reference rod 3, a drive for moving the reference rod 3 in the form of an endless thread (chain) 4, a support 5 under the shank of the reference rod and supporting rollers 6. Support 5 is installed on a trolley 7, which moves in guides 8 placed on racks 9, by means of an endless thread (chain) 4 having a drive 10 and a tension device 11. On both sides of the reference rod on the racks 9 are vertical column 12 fixed on them levers 13 on which is pivotally mounted by means of axles 14 supporting the rollers 6 with the possibility of information in a horizontal plane for holding the reference rod. The drive synchronous information levers 13 is made in the form of kinematically interconnected gear sectors 15 and racks 16 with a drive from the power cylinder 17. The gear sectors 15 and levers 13 of the supporting rollers 6 are located on the axes 18, pivotally mounted in the vertical columns 12. The rack 16 and power cylinder 17 is placed on racks 9.

When rolling, the reference rod 3 is kept from axial movement by the stop-adjusting mechanism 2. After the rolling and tilting of the head of the persistent-adjusting mechanism 2, the drive 10 of the endless thread (chain) 4 is turned on and the cart 7 with the shank of the reference rod 3 fixed to it moves along the guides 8 along rolling axis until the rod leaves the zone of the stop-adjusting mechanism 2. When moving the rod is held by supporting rollers 6, which are reduced in a horizontal plane and hold it with two sides, without interfering with the movement of an endless thread (chain) 4.

The proposed rear table of the tube mill compared with the known ones allows you to expand the technological capabilities of the mill by using reference rods of any size when rolling pipes with a small inner diameter.

Claims (1)

The back table of the rolling mill, comprising a stop-adjusting mechanism for holding the mandrel bar, a drive for moving the mandrel bar in the form of an endless thread, a support for the mandrel shank mounted on the trolley, and rollers supporting the mandrel rod, articulated on the levers, characterized in that the supporting rollers mounted on both sides of the mandrel rod with the possibility of information in the horizontal plane, and the axis of the levers on which they are mounted are vertically arranged and have a drive of their synchronous information, made in the form of kinematically connected to each other gear sectors and rails driven by a power cylinder.