US 7,559,220 B2Granted

Bar speed changing device

AssigneeDanieli & C. Officine Meccanicite S.p.A.

InventorsGiuseppe Bordignon, Ivan Paiaro, Andrea De Luca, Alfredo Poloni

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Abstract

A bar speed changing device (48) comprising a pair of upper rollers (55, 55′) and a pair of lower rollers (59, 59′). Said device receives a bar section with the rollers (55, 55′, 59, 59′) in the open position and rotating at a given speed. Upon leaving the device (48) said sections are fed into axially arranged peripheral seats (58) of rotating drum channels. Control devices calculate the speed at which the bar section must be released, upon completion of the braking action, according to the position that said section must occupy in one of said seats and on the basis of the bar-seat friction coefficient. When the rollers (55, 55′, 59, 59′) receive the bar, they turn at the calculated release speed. At a predefined moment, such to enable braking in the correct space and time, the four rollers close on the section and exert the braking action, exploiting the dynamic friction between the roller-section.

Claims11

Dependent claims

Bar speed changing device, to change a first speed at which bars of a given length travel along an axis (X) thereof after leaving a rolling train up to a second speed at which said bars are fed, comprising:

at least one first pair of rotating means, having their respective axes of rotation parallel to one another, so as to create a support for the bars,
at least one second pair of rotating means, having their respective axes of rotation parallel to one another, arranged at a predefined distance from the first pair of rotating means, in order to define an intermediate passage for the bars, in which the bars can slide axially,
motors that make the rotating means of the first and second pairs rotate around their respective axes at a controlled speed during bar feed,
means for controlling the speed of the rotating means to keep the rotating means turning at the second feeding speed and
actuator means comprising a pneumatic cylinder of the push type for bringing the rotating means of the second pair closer to the first pair, so that the bar can be gripped between the rotating means during the movement to generate friction between the rotating means and the bars, and a hydraulic cylinder of the pull type for moving the rotating means of the second pair away from the first pair.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/629,452Filed 16 Jun 2005
Priority: IT MI2004A120916 Jun 2004
Published: US 2007/0277576 A16 Dec 2007
Granted: 14 Jul 2009
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

B21B 39/006
Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for…
B21B 39/08
Feeding or supporting work; Braking or tensioning arrangements , e.g. threading arrangements: braking or tensioning arrangements
B21B 13/02
Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories: with axes of rolls arranged horizontally
B21B 31/24
Mechanically , e.g. by thrust blocks, inserts for removal: by screws