Mandrel conveying device for a tube rolling mill

Patent metadata

Field	Value
Publication number	US-10052669-B2
Application number	US-201514929797-A
Country	US
Kind code	B2
Filing date	Nov 2, 2015
Priority date	Apr 7, 2011
Publication date	Aug 21, 2018
Grant date	Aug 21, 2018

Abstract

A rolling plant (R) for rolling tubes having a multi-stand rolling mill ( 5 ) with two or more rolls, in order to implement a controlled speed mandrel rolling process, comprises a hooking and releasing device ( 61 ) which is arranged in the inlet area of the rolling mill ( 5 ) to cooperate with the rear tang of the mandrel ( 31 ) and a hooking and releasing device ( 71 ) which is arranged in the outlet area of the rolling mill ( 5 ) to cooperate with the front tang of the mandrel ( 31 ) in coordinated manner with the first hooking and releasing device ( 61 ).

First claim

What is claimed is:

1. A mandrel conveying device for a multi-stand tube rolling mill with mandrel, defining a rolling axis, the conveying device comprising a rack device and a hooking and releasing device, for hooking and for releasing a tang of the mandrel, the hooking and releasing device comprising one head and a lever hinged to said head about a hinge axis parallel to the rolling axis, wherein said lever is adapted to move with an angular oscillation between a hooking position and a releasing position of the tang of the mandrel, said angular oscillation being performed about the hinge axis on a plane transversal to the rolling axis, said lever comprising a groove complementary with the shape of said tang of the mandrel, said lever acting in connection of said tang of said mandrel in said hooking position such that the groove of said lever hooks the tang of said mandrel to said head when said lever is in said hooking position wherein the rack device comprises two racks side-by-side and parallel to the rolling axis, each of said two racks has two respective gear teeth, the hooking and releasing device being arranged at one end of the two racks.

2. A device according to claim 1 , wherein the two racks are joined along part of their length by a joining element.

3. A device according to claim 2 , wherein the two respective gear teeth of each rack are arranged symmetrically one above and one below the rolling axis.

4. A device according to claim 1 , comprising a cam device and wherein the hooking and releasing device comprises a mechanism actuated by the cam device.

5. A device according to claim 4 , wherein the hooking and releasing device comprises a blocking device for blocking the lever in hooking position of the mandrel.

6. A rolling plant for tubes having defined length, comprising:
a rolling mill, defining a rolling axis, incorporating a plurality of rolling stands adapted to carry out a rolling of a pierced shell to transform it into a rolled tube,
at least one mandrel, having a front end and a rear end, adapted to cooperate with the rolling mill during said rolling,
the rolling plant comprising the following, upstream of the rolling mill:
a first loading device for loading the pierced shell along the rolling axis,
a first unloading device for unloading the at least one mandrel from the rolling axis,
a first mandrel conveying device according to claim 1 ,
the rolling plant comprising the following, downstream of the rolling mill:
a second unloading device adapted to unload the rolled tube from the rolling axis,
a second loading device adapted to load the at least one mandrel along the rolling axis,
a second mandrel conveying device, comprising a second hooking and releasing device for hooking and for releasing the front end of the at least one mandrel.

7. A rolling plant according to claim 6 , wherein control means of the rolling plant are provided to coordinate the first conveying device and the second conveying device in their hooking and releasing operations of the front and rear ends of the at least one mandrel at each rolling cycle.

8. A rolling plant according to claim 7 , wherein the front end and the rear end of the at least one mandrel are equipped with a front tang and a rear tang, respectively, for carrying out the hooking and releasing operations by means of the first mandrel conveying device and the second mandrel conveying device.

9. A rolling plant according to claim 8 , wherein said rolling mill comprises mandrel-supporting stands.

10. A rolling plant according to claim 9 , wherein a feeding device of the pierced shell is provided in the rolling mill.

11. A rolling plant according to claim 10 , wherein there is provided at least one rounding stand which is arranged downstream of a last rolling stand of the rolling mill.

Assignees

• Danieli Off Mecc

Inventors

• Cernuschi Ettore
• Scalmana Claudio Maria

Classifications

• B21C45/00

  Separating mandrels from work or vice versa · CPC title

• B21B25/02 Primary

  Guides, supports, or abutments for mandrels, e.g. carriages {or steadiers}; Adjusting devices for mandrels · CPC title

• B21B17/04

  in a continuous process · CPC title

• B21B17/02 Primary

  with mandrel, {i.e. the mandrel rod contacts the rolled tube over the rod length}(B21B17/08 takes precedence) · CPC title